drivers/scsi/ufs/ufshcd.c

   1 /*
   2  * Universal Flash Storage Host controller driver Core
   3  *
   4  * This code is based on drivers/scsi/ufs/ufshcd.c
   5  * Copyright (C) 2011-2013 Samsung India Software Operations
   6  * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
   7  *
   8  * Authors:
   9  *      Santosh Yaraganavi <santosh.sy@samsung.com>
  10  *      Vinayak Holikatti <h.vinayak@samsung.com>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  * See the COPYING file in the top-level directory or visit
  17  * <http://www.gnu.org/licenses/gpl-2.0.html>
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * This program is provided "AS IS" and "WITH ALL FAULTS" and
  25  * without warranty of any kind. You are solely responsible for
  26  * determining the appropriateness of using and distributing
  27  * the program and assume all risks associated with your exercise
  28  * of rights with respect to the program, including but not limited
  29  * to infringement of third party rights, the risks and costs of
  30  * program errors, damage to or loss of data, programs or equipment,
  31  * and unavailability or interruption of operations. Under no
  32  * circumstances will the contributor of this Program be liable for
  33  * any damages of any kind arising from your use or distribution of
  34  * this program.
  35  *
  36  * The Linux Foundation chooses to take subject only to the GPLv2
  37  * license terms, and distributes only under these terms.
  38  */
  39
  40 #include <linux/async.h>
  41 #include <linux/devfreq.h>
  42
  43 #include "ufshcd.h"
  44 #include "unipro.h"
  45
  46 #define UFSHCD_ENABLE_INTRS     (UTP_TRANSFER_REQ_COMPL |\
  47                                  UTP_TASK_REQ_COMPL |\
  48                                  UFSHCD_ERROR_MASK)
  49 /* UIC command timeout, unit: ms */
  50 #define UIC_CMD_TIMEOUT 500
  51
  52 /* NOP OUT retries waiting for NOP IN response */
  53 #define NOP_OUT_RETRIES    10
  54 /* Timeout after 30 msecs if NOP OUT hangs without response */
  55 #define NOP_OUT_TIMEOUT    30 /* msecs */
  56
  57 /* Query request retries */
  58 #define QUERY_REQ_RETRIES 10
  59 /* Query request timeout */
  60 #define QUERY_REQ_TIMEOUT 30 /* msec */
  61
  62 /* Task management command timeout */
  63 #define TM_CMD_TIMEOUT  100 /* msecs */
  64
  65 /* maximum number of link-startup retries */
  66 #define DME_LINKSTARTUP_RETRIES 3
  67
  68 /* maximum number of reset retries before giving up */
  69 #define MAX_HOST_RESET_RETRIES 5
  70
  71 /* Expose the flag value from utp_upiu_query.value */
  72 #define MASK_QUERY_UPIU_FLAG_LOC 0xFF
  73
  74 /* Interrupt aggregation default timeout, unit: 40us */
  75 #define INT_AGGR_DEF_TO 0x02
  76
  77 #define ufshcd_toggle_vreg(_dev, _vreg, _on)                            \
  78         ({                                                              \
  79                 int _ret;                                               \
  80                 if (_on)                                                \
  81                         _ret = ufshcd_enable_vreg(_dev, _vreg);         \
  82                 else                                                    \
  83                         _ret = ufshcd_disable_vreg(_dev, _vreg);        \
  84                 _ret;                                                   \
  85         })
  86
  87 static u32 ufs_query_desc_max_size[] = {
  88         QUERY_DESC_DEVICE_MAX_SIZE,
  89         QUERY_DESC_CONFIGURAION_MAX_SIZE,
  90         QUERY_DESC_UNIT_MAX_SIZE,
  91         QUERY_DESC_RFU_MAX_SIZE,
  92         QUERY_DESC_INTERCONNECT_MAX_SIZE,
  93         QUERY_DESC_STRING_MAX_SIZE,
  94         QUERY_DESC_RFU_MAX_SIZE,
  95         QUERY_DESC_GEOMETRY_MAZ_SIZE,
  96         QUERY_DESC_POWER_MAX_SIZE,
  97         QUERY_DESC_RFU_MAX_SIZE,
  98 };
  99
 100 enum {
 101         UFSHCD_MAX_CHANNEL      = 0,
 102         UFSHCD_MAX_ID           = 1,
 103         UFSHCD_CMD_PER_LUN      = 32,
 104         UFSHCD_CAN_QUEUE        = 32,
 105 };
 106
 107 /* UFSHCD states */
 108 enum {
 109         UFSHCD_STATE_RESET,
 110         UFSHCD_STATE_ERROR,
 111         UFSHCD_STATE_OPERATIONAL,
 112 };
 113
 114 /* UFSHCD error handling flags */
 115 enum {
 116         UFSHCD_EH_IN_PROGRESS = (1 << 0),
 117 };
 118
 119 /* UFSHCD UIC layer error flags */
 120 enum {
 121         UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
 122         UFSHCD_UIC_NL_ERROR = (1 << 1), /* Network layer error */
 123         UFSHCD_UIC_TL_ERROR = (1 << 2), /* Transport Layer error */
 124         UFSHCD_UIC_DME_ERROR = (1 << 3), /* DME error */
 125 };
 126
 127 /* Interrupt configuration options */
 128 enum {
 129         UFSHCD_INT_DISABLE,
 130         UFSHCD_INT_ENABLE,
 131         UFSHCD_INT_CLEAR,
 132 };
 133
 134 #define ufshcd_set_eh_in_progress(h) \
 135         (h->eh_flags |= UFSHCD_EH_IN_PROGRESS)
 136 #define ufshcd_eh_in_progress(h) \
 137         (h->eh_flags & UFSHCD_EH_IN_PROGRESS)
 138 #define ufshcd_clear_eh_in_progress(h) \
 139         (h->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)
 140
 141 #define ufshcd_set_ufs_dev_active(h) \
 142         ((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
 143 #define ufshcd_set_ufs_dev_sleep(h) \
 144         ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
 145 #define ufshcd_set_ufs_dev_poweroff(h) \
 146         ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
 147 #define ufshcd_is_ufs_dev_active(h) \
 148         ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
 149 #define ufshcd_is_ufs_dev_sleep(h) \
 150         ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
 151 #define ufshcd_is_ufs_dev_poweroff(h) \
 152         ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
 153
 154 static struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
 155         {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
 156         {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
 157         {UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
 158         {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
 159         {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
 160         {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
 161 };
 162
 163 static inline enum ufs_dev_pwr_mode
 164 ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
 165 {
 166         return ufs_pm_lvl_states[lvl].dev_state;
 167 }
 168
 169 static inline enum uic_link_state
 170 ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
 171 {
 172         return ufs_pm_lvl_states[lvl].link_state;
 173 }
 174
 175 static void ufshcd_tmc_handler(struct ufs_hba *hba);
 176 static void ufshcd_async_scan(void *data, async_cookie_t cookie);
 177 static int ufshcd_reset_and_restore(struct ufs_hba *hba);
 178 static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
 179 static void ufshcd_hba_exit(struct ufs_hba *hba);
 180 static int ufshcd_probe_hba(struct ufs_hba *hba);
 181 static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 182                                  bool skip_ref_clk);
 183 static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
 184 static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
 185 static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
 186 static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
 187 static irqreturn_t ufshcd_intr(int irq, void *__hba);
 188 static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
 189                 struct ufs_pa_layer_attr *desired_pwr_mode);
 190
 191 static inline int ufshcd_enable_irq(struct ufs_hba *hba)
 192 {
 193         int ret = 0;
 194
 195         if (!hba->is_irq_enabled) {
 196                 ret = request_irq(hba->irq, ufshcd_intr, IRQF_SHARED, UFSHCD,
 197                                 hba);
 198                 if (ret)
 199                         dev_err(hba->dev, "%s: request_irq failed, ret=%d\n",
 200                                 __func__, ret);
 201                 hba->is_irq_enabled = true;
 202         }
 203
 204         return ret;
 205 }
 206
 207 static inline void ufshcd_disable_irq(struct ufs_hba *hba)
 208 {
 209         if (hba->is_irq_enabled) {
 210                 free_irq(hba->irq, hba);
 211                 hba->is_irq_enabled = false;
 212         }
 213 }
 214
 215 /*
 216  * ufshcd_wait_for_register - wait for register value to change
 217  * @hba - per-adapter interface
 218  * @reg - mmio register offset
 219  * @mask - mask to apply to read register value
 220  * @val - wait condition
 221  * @interval_us - polling interval in microsecs
 222  * @timeout_ms - timeout in millisecs
 223  *
 224  * Returns -ETIMEDOUT on error, zero on success
 225  */
 226 static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
 227                 u32 val, unsigned long interval_us, unsigned long timeout_ms)
 228 {
 229         int err = 0;
 230         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 231
 232         /* ignore bits that we don't intend to wait on */
 233         val = val & mask;
 234
 235         while ((ufshcd_readl(hba, reg) & mask) != val) {
 236                 /* wakeup within 50us of expiry */
 237                 usleep_range(interval_us, interval_us + 50);
 238
 239                 if (time_after(jiffies, timeout)) {
 240                         if ((ufshcd_readl(hba, reg) & mask) != val)
 241                                 err = -ETIMEDOUT;
 242                         break;
 243                 }
 244         }
 245
 246         return err;
 247 }
 248
 249 /**
 250  * ufshcd_get_intr_mask - Get the interrupt bit mask
 251  * @hba - Pointer to adapter instance
 252  *
 253  * Returns interrupt bit mask per version
 254  */
 255 static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
 256 {
 257         if (hba->ufs_version == UFSHCI_VERSION_10)
 258                 return INTERRUPT_MASK_ALL_VER_10;
 259         else
 260                 return INTERRUPT_MASK_ALL_VER_11;
 261 }
 262
 263 /**
 264  * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 265  * @hba - Pointer to adapter instance
 266  *
 267  * Returns UFSHCI version supported by the controller
 268  */
 269 static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
 270 {
 271         return ufshcd_readl(hba, REG_UFS_VERSION);
 272 }
 273
 274 /**
 275  * ufshcd_is_device_present - Check if any device connected to
 276  *                            the host controller
 277  * @hba: pointer to adapter instance
 278  *
 279  * Returns 1 if device present, 0 if no device detected
 280  */
 281 static inline int ufshcd_is_device_present(struct ufs_hba *hba)
 282 {
 283         return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
 284                                                 DEVICE_PRESENT) ? 1 : 0;
 285 }
 286
 287 /**
 288  * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 289  * @lrb: pointer to local command reference block
 290  *
 291  * This function is used to get the OCS field from UTRD
 292  * Returns the OCS field in the UTRD
 293  */
 294 static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
 295 {
 296         return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
 297 }
 298
 299 /**
 300  * ufshcd_get_tmr_ocs - Get the UTMRD Overall Command Status
 301  * @task_req_descp: pointer to utp_task_req_desc structure
 302  *
 303  * This function is used to get the OCS field from UTMRD
 304  * Returns the OCS field in the UTMRD
 305  */
 306 static inline int
 307 ufshcd_get_tmr_ocs(struct utp_task_req_desc *task_req_descp)
 308 {
 309         return le32_to_cpu(task_req_descp->header.dword_2) & MASK_OCS;
 310 }
 311
 312 /**
 313  * ufshcd_get_tm_free_slot - get a free slot for task management request
 314  * @hba: per adapter instance
 315  * @free_slot: pointer to variable with available slot value
 316  *
 317  * Get a free tag and lock it until ufshcd_put_tm_slot() is called.
 318  * Returns 0 if free slot is not available, else return 1 with tag value
 319  * in @free_slot.
 320  */
 321 static bool ufshcd_get_tm_free_slot(struct ufs_hba *hba, int *free_slot)
 322 {
 323         int tag;
 324         bool ret = false;
 325
 326         if (!free_slot)
 327                 goto out;
 328
 329         do {
 330                 tag = find_first_zero_bit(&hba->tm_slots_in_use, hba->nutmrs);
 331                 if (tag >= hba->nutmrs)
 332                         goto out;
 333         } while (test_and_set_bit_lock(tag, &hba->tm_slots_in_use));
 334
 335         *free_slot = tag;
 336         ret = true;
 337 out:
 338         return ret;
 339 }
 340
 341 static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
 342 {
 343         clear_bit_unlock(slot, &hba->tm_slots_in_use);
 344 }
 345
 346 /**
 347  * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
 348  * @hba: per adapter instance
 349  * @pos: position of the bit to be cleared
 350  */
 351 static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
 352 {
 353         ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
 354 }
 355
 356 /**
 357  * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 358  * @reg: Register value of host controller status
 359  *
 360  * Returns integer, 0 on Success and positive value if failed
 361  */
 362 static inline int ufshcd_get_lists_status(u32 reg)
 363 {
 364         /*
 365          * The mask 0xFF is for the following HCS register bits
 366          * Bit          Description
 367          *  0           Device Present
 368          *  1           UTRLRDY
 369          *  2           UTMRLRDY
 370          *  3           UCRDY
 371          *  4           HEI
 372          *  5           DEI
 373          * 6-7          reserved
 374          */
 375         return (((reg) & (0xFF)) >> 1) ^ (0x07);
 376 }
 377
 378 /**
 379  * ufshcd_get_uic_cmd_result - Get the UIC command result
 380  * @hba: Pointer to adapter instance
 381  *
 382  * This function gets the result of UIC command completion
 383  * Returns 0 on success, non zero value on error
 384  */
 385 static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
 386 {
 387         return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
 388                MASK_UIC_COMMAND_RESULT;
 389 }
 390
 391 /**
 392  * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 393  * @hba: Pointer to adapter instance
 394  *
 395  * This function gets UIC command argument3
 396  * Returns 0 on success, non zero value on error
 397  */
 398 static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
 399 {
 400         return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
 401 }
 402
 403 /**
 404  * ufshcd_get_req_rsp - returns the TR response transaction type
 405  * @ucd_rsp_ptr: pointer to response UPIU
 406  */
 407 static inline int
 408 ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
 409 {
 410         return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
 411 }
 412
 413 /**
 414  * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 415  * @ucd_rsp_ptr: pointer to response UPIU
 416  *
 417  * This function gets the response status and scsi_status from response UPIU
 418  * Returns the response result code.
 419  */
 420 static inline int
 421 ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
 422 {
 423         return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
 424 }
 425
 426 /*
 427  * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 428  *                              from response UPIU
 429  * @ucd_rsp_ptr: pointer to response UPIU
 430  *
 431  * Return the data segment length.
 432  */
 433 static inline unsigned int
 434 ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
 435 {
 436         return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
 437                 MASK_RSP_UPIU_DATA_SEG_LEN;
 438 }
 439
 440 /**
 441  * ufshcd_is_exception_event - Check if the device raised an exception event
 442  * @ucd_rsp_ptr: pointer to response UPIU
 443  *
 444  * The function checks if the device raised an exception event indicated in
 445  * the Device Information field of response UPIU.
 446  *
 447  * Returns true if exception is raised, false otherwise.
 448  */
 449 static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
 450 {
 451         return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
 452                         MASK_RSP_EXCEPTION_EVENT ? true : false;
 453 }
 454
 455 /**
 456  * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
 457  * @hba: per adapter instance
 458  */
 459 static inline void
 460 ufshcd_reset_intr_aggr(struct ufs_hba *hba)
 461 {
 462         ufshcd_writel(hba, INT_AGGR_ENABLE |
 463                       INT_AGGR_COUNTER_AND_TIMER_RESET,
 464                       REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
 465 }
 466
 467 /**
 468  * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 469  * @hba: per adapter instance
 470  * @cnt: Interrupt aggregation counter threshold
 471  * @tmout: Interrupt aggregation timeout value
 472  */
 473 static inline void
 474 ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
 475 {
 476         ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
 477                       INT_AGGR_COUNTER_THLD_VAL(cnt) |
 478                       INT_AGGR_TIMEOUT_VAL(tmout),
 479                       REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
 480 }
 481
 482 /**
 483  * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 484  *                      When run-stop registers are set to 1, it indicates the
 485  *                      host controller that it can process the requests
 486  * @hba: per adapter instance
 487  */
 488 static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
 489 {
 490         ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
 491                       REG_UTP_TASK_REQ_LIST_RUN_STOP);
 492         ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
 493                       REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
 494 }
 495
 496 /**
 497  * ufshcd_hba_start - Start controller initialization sequence
 498  * @hba: per adapter instance
 499  */
 500 static inline void ufshcd_hba_start(struct ufs_hba *hba)
 501 {
 502         ufshcd_writel(hba, CONTROLLER_ENABLE, REG_CONTROLLER_ENABLE);
 503 }
 504
 505 /**
 506  * ufshcd_is_hba_active - Get controller state
 507  * @hba: per adapter instance
 508  *
 509  * Returns zero if controller is active, 1 otherwise
 510  */
 511 static inline int ufshcd_is_hba_active(struct ufs_hba *hba)
 512 {
 513         return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
 514 }
 515
 516 static void ufshcd_ungate_work(struct work_struct *work)
 517 {
 518         int ret;
 519         unsigned long flags;
 520         struct ufs_hba *hba = container_of(work, struct ufs_hba,
 521                         clk_gating.ungate_work);
 522
 523         cancel_delayed_work_sync(&hba->clk_gating.gate_work);
 524
 525         spin_lock_irqsave(hba->host->host_lock, flags);
 526         if (hba->clk_gating.state == CLKS_ON) {
 527                 spin_unlock_irqrestore(hba->host->host_lock, flags);
 528                 goto unblock_reqs;
 529         }
 530
 531         spin_unlock_irqrestore(hba->host->host_lock, flags);
 532         ufshcd_setup_clocks(hba, true);
 533
 534         /* Exit from hibern8 */
 535         if (ufshcd_can_hibern8_during_gating(hba)) {
 536                 /* Prevent gating in this path */
 537                 hba->clk_gating.is_suspended = true;
 538                 if (ufshcd_is_link_hibern8(hba)) {
 539                         ret = ufshcd_uic_hibern8_exit(hba);
 540                         if (ret)
 541                                 dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
 542                                         __func__, ret);
 543                         else
 544                                 ufshcd_set_link_active(hba);
 545                 }
 546                 hba->clk_gating.is_suspended = false;
 547         }
 548 unblock_reqs:
 549         if (ufshcd_is_clkscaling_enabled(hba))
 550                 devfreq_resume_device(hba->devfreq);
 551         scsi_unblock_requests(hba->host);
 552 }
 553
 554 /**
 555  * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 556  * Also, exit from hibern8 mode and set the link as active.
 557  * @hba: per adapter instance
 558  * @async: This indicates whether caller should ungate clocks asynchronously.
 559  */
 560 int ufshcd_hold(struct ufs_hba *hba, bool async)
 561 {
 562         int rc = 0;
 563         unsigned long flags;
 564
 565         if (!ufshcd_is_clkgating_allowed(hba))
 566                 goto out;
 567         spin_lock_irqsave(hba->host->host_lock, flags);
 568         hba->clk_gating.active_reqs++;
 569
 570 start:
 571         switch (hba->clk_gating.state) {
 572         case CLKS_ON:
 573                 break;
 574         case REQ_CLKS_OFF:
 575                 if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
 576                         hba->clk_gating.state = CLKS_ON;
 577                         break;
 578                 }
 579                 /*
 580                  * If we here, it means gating work is either done or
 581                  * currently running. Hence, fall through to cancel gating
 582                  * work and to enable clocks.
 583                  */
 584         case CLKS_OFF:
 585                 scsi_block_requests(hba->host);
 586                 hba->clk_gating.state = REQ_CLKS_ON;
 587                 schedule_work(&hba->clk_gating.ungate_work);
 588                 /*
 589                  * fall through to check if we should wait for this
 590                  * work to be done or not.
 591                  */
 592         case REQ_CLKS_ON:
 593                 if (async) {
 594                         rc = -EAGAIN;
 595                         hba->clk_gating.active_reqs--;
 596                         break;
 597                 }
 598
 599                 spin_unlock_irqrestore(hba->host->host_lock, flags);
 600                 flush_work(&hba->clk_gating.ungate_work);
 601                 /* Make sure state is CLKS_ON before returning */
 602                 spin_lock_irqsave(hba->host->host_lock, flags);
 603                 goto start;
 604         default:
 605                 dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
 606                                 __func__, hba->clk_gating.state);
 607                 break;
 608         }
 609         spin_unlock_irqrestore(hba->host->host_lock, flags);
 610 out:
 611         return rc;
 612 }
 613
 614 static void ufshcd_gate_work(struct work_struct *work)
 615 {
 616         struct ufs_hba *hba = container_of(work, struct ufs_hba,
 617                         clk_gating.gate_work.work);
 618         unsigned long flags;
 619
 620         spin_lock_irqsave(hba->host->host_lock, flags);
 621         if (hba->clk_gating.is_suspended) {
 622                 hba->clk_gating.state = CLKS_ON;
 623                 goto rel_lock;
 624         }
 625
 626         if (hba->clk_gating.active_reqs
 627                 || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
 628                 || hba->lrb_in_use || hba->outstanding_tasks
 629                 || hba->active_uic_cmd || hba->uic_async_done)
 630                 goto rel_lock;
 631
 632         spin_unlock_irqrestore(hba->host->host_lock, flags);
 633
 634         /* put the link into hibern8 mode before turning off clocks */
 635         if (ufshcd_can_hibern8_during_gating(hba)) {
 636                 if (ufshcd_uic_hibern8_enter(hba)) {
 637                         hba->clk_gating.state = CLKS_ON;
 638                         goto out;
 639                 }
 640                 ufshcd_set_link_hibern8(hba);
 641         }
 642
 643         if (ufshcd_is_clkscaling_enabled(hba)) {
 644                 devfreq_suspend_device(hba->devfreq);
 645                 hba->clk_scaling.window_start_t = 0;
 646         }
 647
 648         if (!ufshcd_is_link_active(hba))
 649                 ufshcd_setup_clocks(hba, false);
 650         else
 651                 /* If link is active, device ref_clk can't be switched off */
 652                 __ufshcd_setup_clocks(hba, false, true);
 653
 654         /*
 655          * In case you are here to cancel this work the gating state
 656          * would be marked as REQ_CLKS_ON. In this case keep the state
 657          * as REQ_CLKS_ON which would anyway imply that clocks are off
 658          * and a request to turn them on is pending. By doing this way,
 659          * we keep the state machine in tact and this would ultimately
 660          * prevent from doing cancel work multiple times when there are
 661          * new requests arriving before the current cancel work is done.
 662          */
 663         spin_lock_irqsave(hba->host->host_lock, flags);
 664         if (hba->clk_gating.state == REQ_CLKS_OFF)
 665                 hba->clk_gating.state = CLKS_OFF;
 666
 667 rel_lock:
 668         spin_unlock_irqrestore(hba->host->host_lock, flags);
 669 out:
 670         return;
 671 }
 672
 673 /* host lock must be held before calling this variant */
 674 static void __ufshcd_release(struct ufs_hba *hba)
 675 {
 676         if (!ufshcd_is_clkgating_allowed(hba))
 677                 return;
 678
 679         hba->clk_gating.active_reqs--;
 680
 681         if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
 682                 || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
 683                 || hba->lrb_in_use || hba->outstanding_tasks
 684                 || hba->active_uic_cmd || hba->uic_async_done)
 685                 return;
 686
 687         hba->clk_gating.state = REQ_CLKS_OFF;
 688         schedule_delayed_work(&hba->clk_gating.gate_work,
 689                         msecs_to_jiffies(hba->clk_gating.delay_ms));
 690 }
 691
 692 void ufshcd_release(struct ufs_hba *hba)
 693 {
 694         unsigned long flags;
 695
 696         spin_lock_irqsave(hba->host->host_lock, flags);
 697         __ufshcd_release(hba);
 698         spin_unlock_irqrestore(hba->host->host_lock, flags);
 699 }
 700
 701 static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
 702                 struct device_attribute *attr, char *buf)
 703 {
 704         struct ufs_hba *hba = dev_get_drvdata(dev);
 705
 706         return snprintf(buf, PAGE_SIZE, "%lu\n", hba->clk_gating.delay_ms);
 707 }
 708
 709 static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
 710                 struct device_attribute *attr, const char *buf, size_t count)
 711 {
 712         struct ufs_hba *hba = dev_get_drvdata(dev);
 713         unsigned long flags, value;
 714
 715         if (kstrtoul(buf, 0, &value))
 716                 return -EINVAL;
 717
 718         spin_lock_irqsave(hba->host->host_lock, flags);
 719         hba->clk_gating.delay_ms = value;
 720         spin_unlock_irqrestore(hba->host->host_lock, flags);
 721         return count;
 722 }
 723
 724 static void ufshcd_init_clk_gating(struct ufs_hba *hba)
 725 {
 726         if (!ufshcd_is_clkgating_allowed(hba))
 727                 return;
 728
 729         hba->clk_gating.delay_ms = 150;
 730         INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
 731         INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);
 732
 733         hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
 734         hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
 735         sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
 736         hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
 737         hba->clk_gating.delay_attr.attr.mode = S_IRUGO | S_IWUSR;
 738         if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
 739                 dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");
 740 }
 741
 742 static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
 743 {
 744         if (!ufshcd_is_clkgating_allowed(hba))
 745                 return;
 746         device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
 747 }
 748
 749 /* Must be called with host lock acquired */
 750 static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
 751 {
 752         if (!ufshcd_is_clkscaling_enabled(hba))
 753                 return;
 754
 755         if (!hba->clk_scaling.is_busy_started) {
 756                 hba->clk_scaling.busy_start_t = ktime_get();
 757                 hba->clk_scaling.is_busy_started = true;
 758         }
 759 }
 760
 761 static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
 762 {
 763         struct ufs_clk_scaling *scaling = &hba->clk_scaling;
 764
 765         if (!ufshcd_is_clkscaling_enabled(hba))
 766                 return;
 767
 768         if (!hba->outstanding_reqs && scaling->is_busy_started) {
 769                 scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
 770                                         scaling->busy_start_t));
 771                 scaling->busy_start_t = ktime_set(0, 0);
 772                 scaling->is_busy_started = false;
 773         }
 774 }
 775 /**
 776  * ufshcd_send_command - Send SCSI or device management commands
 777  * @hba: per adapter instance
 778  * @task_tag: Task tag of the command
 779  */
 780 static inline
 781 void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
 782 {
 783         ufshcd_clk_scaling_start_busy(hba);
 784         __set_bit(task_tag, &hba->outstanding_reqs);
 785         ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
 786 }
 787
 788 /**
 789  * ufshcd_copy_sense_data - Copy sense data in case of check condition
 790  * @lrb - pointer to local reference block
 791  */
 792 static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
 793 {
 794         int len;
 795         if (lrbp->sense_buffer &&
 796             ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
 797                 len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
 798                 memcpy(lrbp->sense_buffer,
 799                         lrbp->ucd_rsp_ptr->sr.sense_data,
 800                         min_t(int, len, SCSI_SENSE_BUFFERSIZE));
 801         }
 802 }
 803
 804 /**
 805  * ufshcd_copy_query_response() - Copy the Query Response and the data
 806  * descriptor
 807  * @hba: per adapter instance
 808  * @lrb - pointer to local reference block
 809  */
 810 static
 811 int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 812 {
 813         struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
 814
 815         memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);
 816
 817         /* Get the descriptor */
 818         if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
 819                 u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
 820                                 GENERAL_UPIU_REQUEST_SIZE;
 821                 u16 resp_len;
 822                 u16 buf_len;
 823
 824                 /* data segment length */
 825                 resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
 826                                                 MASK_QUERY_DATA_SEG_LEN;
 827                 buf_len = be16_to_cpu(
 828                                 hba->dev_cmd.query.request.upiu_req.length);
 829                 if (likely(buf_len >= resp_len)) {
 830                         memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
 831                 } else {
 832                         dev_warn(hba->dev,
 833                                 "%s: Response size is bigger than buffer",
 834                                 __func__);
 835                         return -EINVAL;
 836                 }
 837         }
 838
 839         return 0;
 840 }
 841
 842 /**
 843  * ufshcd_hba_capabilities - Read controller capabilities
 844  * @hba: per adapter instance
 845  */
 846 static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
 847 {
 848         hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
 849
 850         /* nutrs and nutmrs are 0 based values */
 851         hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
 852         hba->nutmrs =
 853         ((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
 854 }
 855
 856 /**
 857  * ufshcd_ready_for_uic_cmd - Check if controller is ready
 858  *                            to accept UIC commands
 859  * @hba: per adapter instance
 860  * Return true on success, else false
 861  */
 862 static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
 863 {
 864         if (ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY)
 865                 return true;
 866         else
 867                 return false;
 868 }
 869
 870 /**
 871  * ufshcd_get_upmcrs - Get the power mode change request status
 872  * @hba: Pointer to adapter instance
 873  *
 874  * This function gets the UPMCRS field of HCS register
 875  * Returns value of UPMCRS field
 876  */
 877 static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
 878 {
 879         return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
 880 }
 881
 882 /**
 883  * ufshcd_dispatch_uic_cmd - Dispatch UIC commands to unipro layers
 884  * @hba: per adapter instance
 885  * @uic_cmd: UIC command
 886  *
 887  * Mutex must be held.
 888  */
 889 static inline void
 890 ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 891 {
 892         WARN_ON(hba->active_uic_cmd);
 893
 894         hba->active_uic_cmd = uic_cmd;
 895
 896         /* Write Args */
 897         ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
 898         ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
 899         ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);
 900
 901         /* Write UIC Cmd */
 902         ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
 903                       REG_UIC_COMMAND);
 904 }
 905
 906 /**
 907  * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command
 908  * @hba: per adapter instance
 909  * @uic_command: UIC command
 910  *
 911  * Must be called with mutex held.
 912  * Returns 0 only if success.
 913  */
 914 static int
 915 ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 916 {
 917         int ret;
 918         unsigned long flags;
 919
 920         if (wait_for_completion_timeout(&uic_cmd->done,
 921                                         msecs_to_jiffies(UIC_CMD_TIMEOUT)))
 922                 ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
 923         else
 924                 ret = -ETIMEDOUT;
 925
 926         spin_lock_irqsave(hba->host->host_lock, flags);
 927         hba->active_uic_cmd = NULL;
 928         spin_unlock_irqrestore(hba->host->host_lock, flags);
 929
 930         return ret;
 931 }
 932
 933 /**
 934  * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 935  * @hba: per adapter instance
 936  * @uic_cmd: UIC command
 937  *
 938  * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called
 939  * with mutex held and host_lock locked.
 940  * Returns 0 only if success.
 941  */
 942 static int
 943 __ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 944 {
 945         if (!ufshcd_ready_for_uic_cmd(hba)) {
 946                 dev_err(hba->dev,
 947                         "Controller not ready to accept UIC commands\n");
 948                 return -EIO;
 949         }
 950
 951         init_completion(&uic_cmd->done);
 952
 953         ufshcd_dispatch_uic_cmd(hba, uic_cmd);
 954
 955         return 0;
 956 }
 957
 958 /**
 959  * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 960  * @hba: per adapter instance
 961  * @uic_cmd: UIC command
 962  *
 963  * Returns 0 only if success.
 964  */
 965 static int
 966 ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 967 {
 968         int ret;
 969         unsigned long flags;
 970
 971         ufshcd_hold(hba, false);
 972         mutex_lock(&hba->uic_cmd_mutex);
 973         spin_lock_irqsave(hba->host->host_lock, flags);
 974         ret = __ufshcd_send_uic_cmd(hba, uic_cmd);
 975         spin_unlock_irqrestore(hba->host->host_lock, flags);
 976         if (!ret)
 977                 ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);
 978
 979         mutex_unlock(&hba->uic_cmd_mutex);
 980
 981         ufshcd_release(hba);
 982         return ret;
 983 }
 984
 985 /**
 986  * ufshcd_map_sg - Map scatter-gather list to prdt
 987  * @lrbp - pointer to local reference block
 988  *
 989  * Returns 0 in case of success, non-zero value in case of failure
 990  */
 991 static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
 992 {
 993         struct ufshcd_sg_entry *prd_table;
 994         struct scatterlist *sg;
 995         struct scsi_cmnd *cmd;
 996         int sg_segments;
 997         int i;
 998
 999         cmd = lrbp->cmd;
1000         sg_segments = scsi_dma_map(cmd);
1001         if (sg_segments < 0)
1002                 return sg_segments;
1003
1004         if (sg_segments) {
1005                 lrbp->utr_descriptor_ptr->prd_table_length =
1006                                         cpu_to_le16((u16) (sg_segments));
1007
1008                 prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
1009
1010                 scsi_for_each_sg(cmd, sg, sg_segments, i) {
1011                         prd_table[i].size  =
1012                                 cpu_to_le32(((u32) sg_dma_len(sg))-1);
1013                         prd_table[i].base_addr =
1014                                 cpu_to_le32(lower_32_bits(sg->dma_address));
1015                         prd_table[i].upper_addr =
1016                                 cpu_to_le32(upper_32_bits(sg->dma_address));
1017                 }
1018         } else {
1019                 lrbp->utr_descriptor_ptr->prd_table_length = 0;
1020         }
1021
1022         return 0;
1023 }
1024
1025 /**
1026  * ufshcd_enable_intr - enable interrupts
1027  * @hba: per adapter instance
1028  * @intrs: interrupt bits
1029  */
1030 static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
1031 {
1032         u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
1033
1034         if (hba->ufs_version == UFSHCI_VERSION_10) {
1035                 u32 rw;
1036                 rw = set & INTERRUPT_MASK_RW_VER_10;
1037                 set = rw | ((set ^ intrs) & intrs);
1038         } else {
1039                 set |= intrs;
1040         }
1041
1042         ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
1043 }
1044
1045 /**
1046  * ufshcd_disable_intr - disable interrupts
1047  * @hba: per adapter instance
1048  * @intrs: interrupt bits
1049  */
1050 static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
1051 {
1052         u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
1053
1054         if (hba->ufs_version == UFSHCI_VERSION_10) {
1055                 u32 rw;
1056                 rw = (set & INTERRUPT_MASK_RW_VER_10) &
1057                         ~(intrs & INTERRUPT_MASK_RW_VER_10);
1058                 set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);
1059
1060         } else {
1061                 set &= ~intrs;
1062         }
1063
1064         ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
1065 }
1066
1067 /**
1068  * ufshcd_prepare_req_desc_hdr() - Fills the requests header
1069  * descriptor according to request
1070  * @lrbp: pointer to local reference block
1071  * @upiu_flags: flags required in the header
1072  * @cmd_dir: requests data direction
1073  */
1074 static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
1075                 u32 *upiu_flags, enum dma_data_direction cmd_dir)
1076 {
1077         struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
1078         u32 data_direction;
1079         u32 dword_0;
1080
1081         if (cmd_dir == DMA_FROM_DEVICE) {
1082                 data_direction = UTP_DEVICE_TO_HOST;
1083                 *upiu_flags = UPIU_CMD_FLAGS_READ;
1084         } else if (cmd_dir == DMA_TO_DEVICE) {
1085                 data_direction = UTP_HOST_TO_DEVICE;
1086                 *upiu_flags = UPIU_CMD_FLAGS_WRITE;
1087         } else {
1088                 data_direction = UTP_NO_DATA_TRANSFER;
1089                 *upiu_flags = UPIU_CMD_FLAGS_NONE;
1090         }
1091
1092         dword_0 = data_direction | (lrbp->command_type
1093                                 << UPIU_COMMAND_TYPE_OFFSET);
1094         if (lrbp->intr_cmd)
1095                 dword_0 |= UTP_REQ_DESC_INT_CMD;
1096
1097         /* Transfer request descriptor header fields */
1098         req_desc->header.dword_0 = cpu_to_le32(dword_0);
1099
1100         /*
1101          * assigning invalid value for command status. Controller
1102          * updates OCS on command completion, with the command
1103          * status
1104          */
1105         req_desc->header.dword_2 =
1106                 cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
1107 }
1108
1109 /**
1110  * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
1111  * for scsi commands
1112  * @lrbp - local reference block pointer
1113  * @upiu_flags - flags
1114  */
1115 static
1116 void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32 upiu_flags)
1117 {
1118         struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
1119
1120         /* command descriptor fields */
1121         ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
1122                                 UPIU_TRANSACTION_COMMAND, upiu_flags,
1123                                 lrbp->lun, lrbp->task_tag);
1124         ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
1125                                 UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
1126
1127         /* Total EHS length and Data segment length will be zero */
1128         ucd_req_ptr->header.dword_2 = 0;
1129
1130         ucd_req_ptr->sc.exp_data_transfer_len =
1131                 cpu_to_be32(lrbp->cmd->sdb.length);
1132
1133         memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd,
1134                 (min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE)));
1135 }
1136
1137 /**
1138  * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
1139  * for query requsts
1140  * @hba: UFS hba
1141  * @lrbp: local reference block pointer
1142  * @upiu_flags: flags
1143  */
1144 static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
1145                                 struct ufshcd_lrb *lrbp, u32 upiu_flags)
1146 {
1147         struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
1148         struct ufs_query *query = &hba->dev_cmd.query;
1149         u16 len = be16_to_cpu(query->request.upiu_req.length);
1150         u8 *descp = (u8 *)lrbp->ucd_req_ptr + GENERAL_UPIU_REQUEST_SIZE;
1151
1152         /* Query request header */
1153         ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
1154                         UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
1155                         lrbp->lun, lrbp->task_tag);
1156         ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
1157                         0, query->request.query_func, 0, 0);
1158
1159         /* Data segment length */
1160         ucd_req_ptr->header.dword_2 = UPIU_HEADER_DWORD(
1161                         0, 0, len >> 8, (u8)len);
1162
1163         /* Copy the Query Request buffer as is */
1164         memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
1165                         QUERY_OSF_SIZE);
1166
1167         /* Copy the Descriptor */
1168         if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
1169                 memcpy(descp, query->descriptor, len);
1170
1171 }
1172
1173 static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
1174 {
1175         struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
1176
1177         memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));
1178
1179         /* command descriptor fields */
1180         ucd_req_ptr->header.dword_0 =
1181                 UPIU_HEADER_DWORD(
1182                         UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
1183 }
1184
1185 /**
1186  * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU)
1187  * @hba - per adapter instance
1188  * @lrb - pointer to local reference block
1189  */
1190 static int ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
1191 {
1192         u32 upiu_flags;
1193         int ret = 0;
1194
1195         switch (lrbp->command_type) {
1196         case UTP_CMD_TYPE_SCSI:
1197                 if (likely(lrbp->cmd)) {
1198                         ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
1199                                         lrbp->cmd->sc_data_direction);
1200                         ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
1201                 } else {
1202                         ret = -EINVAL;
1203                 }
1204                 break;
1205         case UTP_CMD_TYPE_DEV_MANAGE:
1206                 ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
1207                 if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
1208                         ufshcd_prepare_utp_query_req_upiu(
1209                                         hba, lrbp, upiu_flags);
1210                 else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
1211                         ufshcd_prepare_utp_nop_upiu(lrbp);
1212                 else
1213                         ret = -EINVAL;
1214                 break;
1215         case UTP_CMD_TYPE_UFS:
1216                 /* For UFS native command implementation */
1217                 ret = -ENOTSUPP;
1218                 dev_err(hba->dev, "%s: UFS native command are not supported\n",
1219                         __func__);
1220                 break;
1221         default:
1222                 ret = -ENOTSUPP;
1223                 dev_err(hba->dev, "%s: unknown command type: 0x%x\n",
1224                                 __func__, lrbp->command_type);
1225                 break;
1226         } /* end of switch */
1227
1228         return ret;
1229 }
1230
1231 /*
1232  * ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
1233  * @scsi_lun: scsi LUN id
1234  *
1235  * Returns UPIU LUN id
1236  */
1237 static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
1238 {
1239         if (scsi_is_wlun(scsi_lun))
1240                 return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
1241                         | UFS_UPIU_WLUN_ID;
1242         else
1243                 return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
1244 }
1245
1246 /**
1247  * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
1248  * @scsi_lun: UPIU W-LUN id
1249  *
1250  * Returns SCSI W-LUN id
1251  */
1252 static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
1253 {
1254         return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
1255 }
1256
1257 /**
1258  * ufshcd_queuecommand - main entry point for SCSI requests
1259  * @cmd: command from SCSI Midlayer
1260  * @done: call back function
1261  *
1262  * Returns 0 for success, non-zero in case of failure
1263  */
1264 static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
1265 {
1266         struct ufshcd_lrb *lrbp;
1267         struct ufs_hba *hba;
1268         unsigned long flags;
1269         int tag;
1270         int err = 0;
1271
1272         hba = shost_priv(host);
1273
1274         tag = cmd->request->tag;
1275
1276         spin_lock_irqsave(hba->host->host_lock, flags);
1277         switch (hba->ufshcd_state) {
1278         case UFSHCD_STATE_OPERATIONAL:
1279                 break;
1280         case UFSHCD_STATE_RESET:
1281                 err = SCSI_MLQUEUE_HOST_BUSY;
1282                 goto out_unlock;
1283         case UFSHCD_STATE_ERROR:
1284                 set_host_byte(cmd, DID_ERROR);
1285                 cmd->scsi_done(cmd);
1286                 goto out_unlock;
1287         default:
1288                 dev_WARN_ONCE(hba->dev, 1, "%s: invalid state %d\n",
1289                                 __func__, hba->ufshcd_state);
1290                 set_host_byte(cmd, DID_BAD_TARGET);
1291                 cmd->scsi_done(cmd);
1292                 goto out_unlock;
1293         }
1294         spin_unlock_irqrestore(hba->host->host_lock, flags);
1295
1296         /* acquire the tag to make sure device cmds don't use it */
1297         if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) {
1298                 /*
1299                  * Dev manage command in progress, requeue the command.
1300                  * Requeuing the command helps in cases where the request *may*
1301                  * find different tag instead of waiting for dev manage command
1302                  * completion.
1303                  */
1304                 err = SCSI_MLQUEUE_HOST_BUSY;
1305                 goto out;
1306         }
1307
1308         err = ufshcd_hold(hba, true);
1309         if (err) {
1310                 err = SCSI_MLQUEUE_HOST_BUSY;
1311                 clear_bit_unlock(tag, &hba->lrb_in_use);
1312                 goto out;
1313         }
1314         WARN_ON(hba->clk_gating.state != CLKS_ON);
1315
1316         lrbp = &hba->lrb[tag];
1317
1318         WARN_ON(lrbp->cmd);
1319         lrbp->cmd = cmd;
1320         lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE;
1321         lrbp->sense_buffer = cmd->sense_buffer;
1322         lrbp->task_tag = tag;
1323         lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
1324         lrbp->intr_cmd = false;
1325         lrbp->command_type = UTP_CMD_TYPE_SCSI;
1326
1327         /* form UPIU before issuing the command */
1328         ufshcd_compose_upiu(hba, lrbp);
1329         err = ufshcd_map_sg(lrbp);
1330         if (err) {
1331                 lrbp->cmd = NULL;
1332                 clear_bit_unlock(tag, &hba->lrb_in_use);
1333                 goto out;
1334         }
1335
1336         /* issue command to the controller */
1337         spin_lock_irqsave(hba->host->host_lock, flags);
1338         ufshcd_send_command(hba, tag);
1339 out_unlock:
1340         spin_unlock_irqrestore(hba->host->host_lock, flags);
1341 out:
1342         return err;
1343 }
1344
1345 static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
1346                 struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
1347 {
1348         lrbp->cmd = NULL;
1349         lrbp->sense_bufflen = 0;
1350         lrbp->sense_buffer = NULL;
1351         lrbp->task_tag = tag;
1352         lrbp->lun = 0; /* device management cmd is not specific to any LUN */
1353         lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
1354         lrbp->intr_cmd = true; /* No interrupt aggregation */
1355         hba->dev_cmd.type = cmd_type;
1356
1357         return ufshcd_compose_upiu(hba, lrbp);
1358 }
1359
1360 static int
1361 ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
1362 {
1363         int err = 0;
1364         unsigned long flags;
1365         u32 mask = 1 << tag;
1366
1367         /* clear outstanding transaction before retry */
1368         spin_lock_irqsave(hba->host->host_lock, flags);
1369         ufshcd_utrl_clear(hba, tag);
1370         spin_unlock_irqrestore(hba->host->host_lock, flags);
1371
1372         /*
1373          * wait for for h/w to clear corresponding bit in door-bell.
1374          * max. wait is 1 sec.
1375          */
1376         err = ufshcd_wait_for_register(hba,
1377                         REG_UTP_TRANSFER_REQ_DOOR_BELL,
1378                         mask, ~mask, 1000, 1000);
1379
1380         return err;
1381 }
1382
1383 static int
1384 ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
1385 {
1386         struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
1387
1388         /* Get the UPIU response */
1389         query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
1390                                 UPIU_RSP_CODE_OFFSET;
1391         return query_res->response;
1392 }
1393
1394 /**
1395  * ufshcd_dev_cmd_completion() - handles device management command responses
1396  * @hba: per adapter instance
1397  * @lrbp: pointer to local reference block
1398  */
1399 static int
1400 ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
1401 {
1402         int resp;
1403         int err = 0;
1404
1405         resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
1406
1407         switch (resp) {
1408         case UPIU_TRANSACTION_NOP_IN:
1409                 if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
1410                         err = -EINVAL;
1411                         dev_err(hba->dev, "%s: unexpected response %x\n",
1412                                         __func__, resp);
1413                 }
1414                 break;
1415         case UPIU_TRANSACTION_QUERY_RSP:
1416                 err = ufshcd_check_query_response(hba, lrbp);
1417                 if (!err)
1418                         err = ufshcd_copy_query_response(hba, lrbp);
1419                 break;
1420         case UPIU_TRANSACTION_REJECT_UPIU:
1421                 /* TODO: handle Reject UPIU Response */
1422                 err = -EPERM;
1423                 dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
1424                                 __func__);
1425                 break;
1426         default:
1427                 err = -EINVAL;
1428                 dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
1429                                 __func__, resp);
1430                 break;
1431         }
1432
1433         return err;
1434 }
1435
1436 static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
1437                 struct ufshcd_lrb *lrbp, int max_timeout)
1438 {
1439         int err = 0;
1440         unsigned long time_left;
1441         unsigned long flags;
1442
1443         time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
1444                         msecs_to_jiffies(max_timeout));
1445
1446         spin_lock_irqsave(hba->host->host_lock, flags);
1447         hba->dev_cmd.complete = NULL;
1448         if (likely(time_left)) {
1449                 err = ufshcd_get_tr_ocs(lrbp);
1450                 if (!err)
1451                         err = ufshcd_dev_cmd_completion(hba, lrbp);
1452         }
1453         spin_unlock_irqrestore(hba->host->host_lock, flags);
1454
1455         if (!time_left) {
1456                 err = -ETIMEDOUT;
1457                 if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
1458                         /* sucessfully cleared the command, retry if needed */
1459                         err = -EAGAIN;
1460         }
1461
1462         return err;
1463 }
1464
1465 /**
1466  * ufshcd_get_dev_cmd_tag - Get device management command tag
1467  * @hba: per-adapter instance
1468  * @tag: pointer to variable with available slot value
1469  *
1470  * Get a free slot and lock it until device management command
1471  * completes.
1472  *
1473  * Returns false if free slot is unavailable for locking, else
1474  * return true with tag value in @tag.
1475  */
1476 static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out)
1477 {
1478         int tag;
1479         bool ret = false;
1480         unsigned long tmp;
1481
1482         if (!tag_out)
1483                 goto out;
1484
1485         do {
1486                 tmp = ~hba->lrb_in_use;
1487                 tag = find_last_bit(&tmp, hba->nutrs);
1488                 if (tag >= hba->nutrs)
1489                         goto out;
1490         } while (test_and_set_bit_lock(tag, &hba->lrb_in_use));
1491
1492         *tag_out = tag;
1493         ret = true;
1494 out:
1495         return ret;
1496 }
1497
1498 static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
1499 {
1500         clear_bit_unlock(tag, &hba->lrb_in_use);
1501 }
1502
1503 /**
1504  * ufshcd_exec_dev_cmd - API for sending device management requests
1505  * @hba - UFS hba
1506  * @cmd_type - specifies the type (NOP, Query...)
1507  * @timeout - time in seconds
1508  *
1509  * NOTE: Since there is only one available tag for device management commands,
1510  * it is expected you hold the hba->dev_cmd.lock mutex.
1511  */
1512 static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
1513                 enum dev_cmd_type cmd_type, int timeout)
1514 {
1515         struct ufshcd_lrb *lrbp;
1516         int err;
1517         int tag;
1518         struct completion wait;
1519         unsigned long flags;
1520
1521         /*
1522          * Get free slot, sleep if slots are unavailable.
1523          * Even though we use wait_event() which sleeps indefinitely,
1524          * the maximum wait time is bounded by SCSI request timeout.
1525          */
1526         wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));
1527
1528         init_completion(&wait);
1529         lrbp = &hba->lrb[tag];
1530         WARN_ON(lrbp->cmd);
1531         err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
1532         if (unlikely(err))
1533                 goto out_put_tag;
1534
1535         hba->dev_cmd.complete = &wait;
1536
1537         spin_lock_irqsave(hba->host->host_lock, flags);
1538         ufshcd_send_command(hba, tag);
1539         spin_unlock_irqrestore(hba->host->host_lock, flags);
1540
1541         err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
1542
1543 out_put_tag:
1544         ufshcd_put_dev_cmd_tag(hba, tag);
1545         wake_up(&hba->dev_cmd.tag_wq);
1546         return err;
1547 }
1548
1549 /**
1550  * ufshcd_init_query() - init the query response and request parameters
1551  * @hba: per-adapter instance
1552  * @request: address of the request pointer to be initialized
1553  * @response: address of the response pointer to be initialized
1554  * @opcode: operation to perform
1555  * @idn: flag idn to access
1556  * @index: LU number to access
1557  * @selector: query/flag/descriptor further identification
1558  */
1559 static inline void ufshcd_init_query(struct ufs_hba *hba,
1560                 struct ufs_query_req **request, struct ufs_query_res **response,
1561                 enum query_opcode opcode, u8 idn, u8 index, u8 selector)
1562 {
1563         *request = &hba->dev_cmd.query.request;
1564         *response = &hba->dev_cmd.query.response;
1565         memset(*request, 0, sizeof(struct ufs_query_req));
1566         memset(*response, 0, sizeof(struct ufs_query_res));
1567         (*request)->upiu_req.opcode = opcode;
1568         (*request)->upiu_req.idn = idn;
1569         (*request)->upiu_req.index = index;
1570         (*request)->upiu_req.selector = selector;
1571 }
1572
1573 /**
1574  * ufshcd_query_flag() - API function for sending flag query requests
1575  * hba: per-adapter instance
1576  * query_opcode: flag query to perform
1577  * idn: flag idn to access
1578  * flag_res: the flag value after the query request completes
1579  *
1580  * Returns 0 for success, non-zero in case of failure
1581  */
1582 static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
1583                         enum flag_idn idn, bool *flag_res)
1584 {
1585         struct ufs_query_req *request = NULL;
1586         struct ufs_query_res *response = NULL;
1587         int err, index = 0, selector = 0;
1588
1589         BUG_ON(!hba);
1590
1591         ufshcd_hold(hba, false);
1592         mutex_lock(&hba->dev_cmd.lock);
1593         ufshcd_init_query(hba, &request, &response, opcode, idn, index,
1594                         selector);
1595
1596         switch (opcode) {
1597         case UPIU_QUERY_OPCODE_SET_FLAG:
1598         case UPIU_QUERY_OPCODE_CLEAR_FLAG:
1599         case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
1600                 request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
1601                 break;
1602         case UPIU_QUERY_OPCODE_READ_FLAG:
1603                 request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
1604                 if (!flag_res) {
1605                         /* No dummy reads */
1606                         dev_err(hba->dev, "%s: Invalid argument for read request\n",
1607                                         __func__);
1608                         err = -EINVAL;
1609                         goto out_unlock;
1610                 }
1611                 break;
1612         default:
1613                 dev_err(hba->dev,
1614                         "%s: Expected query flag opcode but got = %d\n",
1615                         __func__, opcode);
1616                 err = -EINVAL;
1617                 goto out_unlock;
1618         }
1619
1620         err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1621
1622         if (err) {
1623                 dev_err(hba->dev,
1624                         "%s: Sending flag query for idn %d failed, err = %d\n",
1625                         __func__, idn, err);
1626                 goto out_unlock;
1627         }
1628
1629         if (flag_res)
1630                 *flag_res = (be32_to_cpu(response->upiu_res.value) &
1631                                 MASK_QUERY_UPIU_FLAG_LOC) & 0x1;
1632
1633 out_unlock:
1634         mutex_unlock(&hba->dev_cmd.lock);
1635         ufshcd_release(hba);
1636         return err;
1637 }
1638
1639 /**
1640  * ufshcd_query_attr - API function for sending attribute requests
1641  * hba: per-adapter instance
1642  * opcode: attribute opcode
1643  * idn: attribute idn to access
1644  * index: index field
1645  * selector: selector field
1646  * attr_val: the attribute value after the query request completes
1647  *
1648  * Returns 0 for success, non-zero in case of failure
1649 */
1650 static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
1651                         enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
1652 {
1653         struct ufs_query_req *request = NULL;
1654         struct ufs_query_res *response = NULL;
1655         int err;
1656
1657         BUG_ON(!hba);
1658
1659         ufshcd_hold(hba, false);
1660         if (!attr_val) {
1661                 dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
1662                                 __func__, opcode);
1663                 err = -EINVAL;
1664                 goto out;
1665         }
1666
1667         mutex_lock(&hba->dev_cmd.lock);
1668         ufshcd_init_query(hba, &request, &response, opcode, idn, index,
1669                         selector);
1670
1671         switch (opcode) {
1672         case UPIU_QUERY_OPCODE_WRITE_ATTR:
1673                 request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
1674                 request->upiu_req.value = cpu_to_be32(*attr_val);
1675                 break;
1676         case UPIU_QUERY_OPCODE_READ_ATTR:
1677                 request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
1678                 break;
1679         default:
1680                 dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
1681                                 __func__, opcode);
1682                 err = -EINVAL;
1683                 goto out_unlock;
1684         }
1685
1686         err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1687
1688         if (err) {
1689                 dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
1690                                 __func__, opcode, idn, err);
1691                 goto out_unlock;
1692         }
1693
1694         *attr_val = be32_to_cpu(response->upiu_res.value);
1695
1696 out_unlock:
1697         mutex_unlock(&hba->dev_cmd.lock);
1698 out:
1699         ufshcd_release(hba);
1700         return err;
1701 }
1702
1703 /**
1704  * ufshcd_query_descriptor - API function for sending descriptor requests
1705  * hba: per-adapter instance
1706  * opcode: attribute opcode
1707  * idn: attribute idn to access
1708  * index: index field
1709  * selector: selector field
1710  * desc_buf: the buffer that contains the descriptor
1711  * buf_len: length parameter passed to the device
1712  *
1713  * Returns 0 for success, non-zero in case of failure.
1714  * The buf_len parameter will contain, on return, the length parameter
1715  * received on the response.
1716  */
1717 static int ufshcd_query_descriptor(struct ufs_hba *hba,
1718                         enum query_opcode opcode, enum desc_idn idn, u8 index,
1719                         u8 selector, u8 *desc_buf, int *buf_len)
1720 {
1721         struct ufs_query_req *request = NULL;
1722         struct ufs_query_res *response = NULL;
1723         int err;
1724
1725         BUG_ON(!hba);
1726
1727         ufshcd_hold(hba, false);
1728         if (!desc_buf) {
1729                 dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
1730                                 __func__, opcode);
1731                 err = -EINVAL;
1732                 goto out;
1733         }
1734
1735         if (*buf_len <= QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
1736                 dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
1737                                 __func__, *buf_len);
1738                 err = -EINVAL;
1739                 goto out;
1740         }
1741
1742         mutex_lock(&hba->dev_cmd.lock);
1743         ufshcd_init_query(hba, &request, &response, opcode, idn, index,
1744                         selector);
1745         hba->dev_cmd.query.descriptor = desc_buf;
1746         request->upiu_req.length = cpu_to_be16(*buf_len);
1747
1748         switch (opcode) {
1749         case UPIU_QUERY_OPCODE_WRITE_DESC:
1750                 request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
1751                 break;
1752         case UPIU_QUERY_OPCODE_READ_DESC:
1753                 request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
1754                 break;
1755         default:
1756                 dev_err(hba->dev,
1757                                 "%s: Expected query descriptor opcode but got = 0x%.2x\n",
1758                                 __func__, opcode);
1759                 err = -EINVAL;
1760                 goto out_unlock;
1761         }
1762
1763         err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1764
1765         if (err) {
1766                 dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
1767                                 __func__, opcode, idn, err);
1768                 goto out_unlock;
1769         }
1770
1771         hba->dev_cmd.query.descriptor = NULL;
1772         *buf_len = be16_to_cpu(response->upiu_res.length);
1773
1774 out_unlock:
1775         mutex_unlock(&hba->dev_cmd.lock);
1776 out:
1777         ufshcd_release(hba);
1778         return err;
1779 }
1780
1781 /**
1782  * ufshcd_read_desc_param - read the specified descriptor parameter
1783  * @hba: Pointer to adapter instance
1784  * @desc_id: descriptor idn value
1785  * @desc_index: descriptor index
1786  * @param_offset: offset of the parameter to read
1787  * @param_read_buf: pointer to buffer where parameter would be read
1788  * @param_size: sizeof(param_read_buf)
1789  *
1790  * Return 0 in case of success, non-zero otherwise
1791  */
1792 static int ufshcd_read_desc_param(struct ufs_hba *hba,
1793                                   enum desc_idn desc_id,
1794                                   int desc_index,
1795                                   u32 param_offset,
1796                                   u8 *param_read_buf,
1797                                   u32 param_size)
1798 {
1799         int ret;
1800         u8 *desc_buf;
1801         u32 buff_len;
1802         bool is_kmalloc = true;
1803
1804         /* safety checks */
1805         if (desc_id >= QUERY_DESC_IDN_MAX)
1806                 return -EINVAL;
1807
1808         buff_len = ufs_query_desc_max_size[desc_id];
1809         if ((param_offset + param_size) > buff_len)
1810                 return -EINVAL;
1811
1812         if (!param_offset && (param_size == buff_len)) {
1813                 /* memory space already available to hold full descriptor */
1814                 desc_buf = param_read_buf;
1815                 is_kmalloc = false;
1816         } else {
1817                 /* allocate memory to hold full descriptor */
1818                 desc_buf = kmalloc(buff_len, GFP_KERNEL);
1819                 if (!desc_buf)
1820                         return -ENOMEM;
1821         }
1822
1823         ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC,
1824                                       desc_id, desc_index, 0, desc_buf,
1825                                       &buff_len);
1826
1827         if (ret || (buff_len < ufs_query_desc_max_size[desc_id]) ||
1828             (desc_buf[QUERY_DESC_LENGTH_OFFSET] !=
1829              ufs_query_desc_max_size[desc_id])
1830             || (desc_buf[QUERY_DESC_DESC_TYPE_OFFSET] != desc_id)) {
1831                 dev_err(hba->dev, "%s: Failed reading descriptor. desc_id %d param_offset %d buff_len %d ret %d",
1832                         __func__, desc_id, param_offset, buff_len, ret);
1833                 if (!ret)
1834                         ret = -EINVAL;
1835
1836                 goto out;
1837         }
1838
1839         if (is_kmalloc)
1840                 memcpy(param_read_buf, &desc_buf[param_offset], param_size);
1841 out:
1842         if (is_kmalloc)
1843                 kfree(desc_buf);
1844         return ret;
1845 }
1846
1847 static inline int ufshcd_read_desc(struct ufs_hba *hba,
1848                                    enum desc_idn desc_id,
1849                                    int desc_index,
1850                                    u8 *buf,
1851                                    u32 size)
1852 {
1853         return ufshcd_read_desc_param(hba, desc_id, desc_index, 0, buf, size);
1854 }
1855
1856 static inline int ufshcd_read_power_desc(struct ufs_hba *hba,
1857                                          u8 *buf,
1858                                          u32 size)
1859 {
1860         return ufshcd_read_desc(hba, QUERY_DESC_IDN_POWER, 0, buf, size);
1861 }
1862
1863 /**
1864  * ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
1865  * @hba: Pointer to adapter instance
1866  * @lun: lun id
1867  * @param_offset: offset of the parameter to read
1868  * @param_read_buf: pointer to buffer where parameter would be read
1869  * @param_size: sizeof(param_read_buf)
1870  *
1871  * Return 0 in case of success, non-zero otherwise
1872  */
1873 static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
1874                                               int lun,
1875                                               enum unit_desc_param param_offset,
1876                                               u8 *param_read_buf,
1877                                               u32 param_size)
1878 {
1879         /*
1880          * Unit descriptors are only available for general purpose LUs (LUN id
1881          * from 0 to 7) and RPMB Well known LU.
1882          */
1883         if (lun != UFS_UPIU_RPMB_WLUN && (lun >= UFS_UPIU_MAX_GENERAL_LUN))
1884                 return -EOPNOTSUPP;
1885
1886         return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
1887                                       param_offset, param_read_buf, param_size);
1888 }
1889
1890 /**
1891  * ufshcd_memory_alloc - allocate memory for host memory space data structures
1892  * @hba: per adapter instance
1893  *
1894  * 1. Allocate DMA memory for Command Descriptor array
1895  *      Each command descriptor consist of Command UPIU, Response UPIU and PRDT
1896  * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
1897  * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
1898  *      (UTMRDL)
1899  * 4. Allocate memory for local reference block(lrb).
1900  *
1901  * Returns 0 for success, non-zero in case of failure
1902  */
1903 static int ufshcd_memory_alloc(struct ufs_hba *hba)
1904 {
1905         size_t utmrdl_size, utrdl_size, ucdl_size;
1906
1907         /* Allocate memory for UTP command descriptors */
1908         ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
1909         hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
1910                                                   ucdl_size,
1911                                                   &hba->ucdl_dma_addr,
1912                                                   GFP_KERNEL);
1913
1914         /*
1915          * UFSHCI requires UTP command descriptor to be 128 byte aligned.
1916          * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE
1917          * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will
1918          * be aligned to 128 bytes as well
1919          */
1920         if (!hba->ucdl_base_addr ||
1921             WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) {
1922                 dev_err(hba->dev,
1923                         "Command Descriptor Memory allocation failed\n");
1924                 goto out;
1925         }
1926
1927         /*
1928          * Allocate memory for UTP Transfer descriptors
1929          * UFSHCI requires 1024 byte alignment of UTRD
1930          */
1931         utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
1932         hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
1933                                                    utrdl_size,
1934                                                    &hba->utrdl_dma_addr,
1935                                                    GFP_KERNEL);
1936         if (!hba->utrdl_base_addr ||
1937             WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
1938                 dev_err(hba->dev,
1939                         "Transfer Descriptor Memory allocation failed\n");
1940                 goto out;
1941         }
1942
1943         /*
1944          * Allocate memory for UTP Task Management descriptors
1945          * UFSHCI requires 1024 byte alignment of UTMRD
1946          */
1947         utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
1948         hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
1949                                                     utmrdl_size,
1950                                                     &hba->utmrdl_dma_addr,
1951                                                     GFP_KERNEL);
1952         if (!hba->utmrdl_base_addr ||
1953             WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
1954                 dev_err(hba->dev,
1955                 "Task Management Descriptor Memory allocation failed\n");
1956                 goto out;
1957         }
1958
1959         /* Allocate memory for local reference block */
1960         hba->lrb = devm_kzalloc(hba->dev,
1961                                 hba->nutrs * sizeof(struct ufshcd_lrb),
1962                                 GFP_KERNEL);
1963         if (!hba->lrb) {
1964                 dev_err(hba->dev, "LRB Memory allocation failed\n");
1965                 goto out;
1966         }
1967         return 0;
1968 out:
1969         return -ENOMEM;
1970 }
1971
1972 /**
1973  * ufshcd_host_memory_configure - configure local reference block with
1974  *                              memory offsets
1975  * @hba: per adapter instance
1976  *
1977  * Configure Host memory space
1978  * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA
1979  * address.
1980  * 2. Update each UTRD with Response UPIU offset, Response UPIU length
1981  * and PRDT offset.
1982  * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
1983  * into local reference block.
1984  */
1985 static void ufshcd_host_memory_configure(struct ufs_hba *hba)
1986 {
1987         struct utp_transfer_cmd_desc *cmd_descp;
1988         struct utp_transfer_req_desc *utrdlp;
1989         dma_addr_t cmd_desc_dma_addr;
1990         dma_addr_t cmd_desc_element_addr;
1991         u16 response_offset;
1992         u16 prdt_offset;
1993         int cmd_desc_size;
1994         int i;
1995
1996         utrdlp = hba->utrdl_base_addr;
1997         cmd_descp = hba->ucdl_base_addr;
1998
1999         response_offset =
2000                 offsetof(struct utp_transfer_cmd_desc, response_upiu);
2001         prdt_offset =
2002                 offsetof(struct utp_transfer_cmd_desc, prd_table);
2003
2004         cmd_desc_size = sizeof(struct utp_transfer_cmd_desc);
2005         cmd_desc_dma_addr = hba->ucdl_dma_addr;
2006
2007         for (i = 0; i < hba->nutrs; i++) {
2008                 /* Configure UTRD with command descriptor base address */
2009                 cmd_desc_element_addr =
2010                                 (cmd_desc_dma_addr + (cmd_desc_size * i));
2011                 utrdlp[i].command_desc_base_addr_lo =
2012                                 cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
2013                 utrdlp[i].command_desc_base_addr_hi =
2014                                 cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
2015
2016                 /* Response upiu and prdt offset should be in double words */
2017                 utrdlp[i].response_upiu_offset =
2018                                 cpu_to_le16((response_offset >> 2));
2019                 utrdlp[i].prd_table_offset =
2020                                 cpu_to_le16((prdt_offset >> 2));
2021                 utrdlp[i].response_upiu_length =
2022                                 cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
2023
2024                 hba->lrb[i].utr_descriptor_ptr = (utrdlp + i);
2025                 hba->lrb[i].ucd_req_ptr =
2026                         (struct utp_upiu_req *)(cmd_descp + i);
2027                 hba->lrb[i].ucd_rsp_ptr =
2028                         (struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
2029                 hba->lrb[i].ucd_prdt_ptr =
2030                         (struct ufshcd_sg_entry *)cmd_descp[i].prd_table;
2031         }
2032 }
2033
2034 /**
2035  * ufshcd_dme_link_startup - Notify Unipro to perform link startup
2036  * @hba: per adapter instance
2037  *
2038  * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer,
2039  * in order to initialize the Unipro link startup procedure.
2040  * Once the Unipro links are up, the device connected to the controller
2041  * is detected.
2042  *
2043  * Returns 0 on success, non-zero value on failure
2044  */
2045 static int ufshcd_dme_link_startup(struct ufs_hba *hba)
2046 {
2047         struct uic_command uic_cmd = {0};
2048         int ret;
2049
2050         uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;
2051
2052         ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
2053         if (ret)
2054                 dev_err(hba->dev,
2055                         "dme-link-startup: error code %d\n", ret);
2056         return ret;
2057 }
2058
2059 /**
2060  * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
2061  * @hba: per adapter instance
2062  * @attr_sel: uic command argument1
2063  * @attr_set: attribute set type as uic command argument2
2064  * @mib_val: setting value as uic command argument3
2065  * @peer: indicate whether peer or local
2066  *
2067  * Returns 0 on success, non-zero value on failure
2068  */
2069 int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
2070                         u8 attr_set, u32 mib_val, u8 peer)
2071 {
2072         struct uic_command uic_cmd = {0};
2073         static const char *const action[] = {
2074                 "dme-set",
2075                 "dme-peer-set"
2076         };
2077         const char *set = action[!!peer];
2078         int ret;
2079
2080         uic_cmd.command = peer ?
2081                 UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
2082         uic_cmd.argument1 = attr_sel;
2083         uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
2084         uic_cmd.argument3 = mib_val;
2085
2086         ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
2087         if (ret)
2088                 dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
2089                         set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
2090
2091         return ret;
2092 }
2093 EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);
2094
2095 /**
2096  * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
2097  * @hba: per adapter instance
2098  * @attr_sel: uic command argument1
2099  * @mib_val: the value of the attribute as returned by the UIC command
2100  * @peer: indicate whether peer or local
2101  *
2102  * Returns 0 on success, non-zero value on failure
2103  */
2104 int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
2105                         u32 *mib_val, u8 peer)
2106 {
2107         struct uic_command uic_cmd = {0};
2108         static const char *const action[] = {
2109                 "dme-get",
2110                 "dme-peer-get"
2111         };
2112         const char *get = action[!!peer];
2113         int ret;
2114
2115         uic_cmd.command = peer ?
2116                 UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
2117         uic_cmd.argument1 = attr_sel;
2118
2119         ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
2120         if (ret) {
2121                 dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",
2122                         get, UIC_GET_ATTR_ID(attr_sel), ret);
2123                 goto out;
2124         }
2125
2126         if (mib_val)
2127                 *mib_val = uic_cmd.argument3;
2128 out:
2129         return ret;
2130 }
2131 EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
2132
2133 /**
2134  * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
2135  * state) and waits for it to take effect.
2136  *
2137  * @hba: per adapter instance
2138  * @cmd: UIC command to execute
2139  *
2140  * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER &
2141  * DME_HIBERNATE_EXIT commands take some time to take its effect on both host
2142  * and device UniPro link and hence it's final completion would be indicated by
2143  * dedicated status bits in Interrupt Status register (UPMS, UHES, UHXS) in
2144  * addition to normal UIC command completion Status (UCCS). This function only
2145  * returns after the relevant status bits indicate the completion.
2146  *
2147  * Returns 0 on success, non-zero value on failure
2148  */
2149 static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
2150 {
2151         struct completion uic_async_done;
2152         unsigned long flags;
2153         u8 status;
2154         int ret;
2155
2156         mutex_lock(&hba->uic_cmd_mutex);
2157         init_completion(&uic_async_done);
2158
2159         spin_lock_irqsave(hba->host->host_lock, flags);
2160         hba->uic_async_done = &uic_async_done;
2161         ret = __ufshcd_send_uic_cmd(hba, cmd);
2162         spin_unlock_irqrestore(hba->host->host_lock, flags);
2163         if (ret) {
2164                 dev_err(hba->dev,
2165                         "pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
2166                         cmd->command, cmd->argument3, ret);
2167                 goto out;
2168         }
2169         ret = ufshcd_wait_for_uic_cmd(hba, cmd);
2170         if (ret) {
2171                 dev_err(hba->dev,
2172                         "pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
2173                         cmd->command, cmd->argument3, ret);
2174                 goto out;
2175         }
2176
2177         if (!wait_for_completion_timeout(hba->uic_async_done,
2178                                          msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
2179                 dev_err(hba->dev,
2180                         "pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n",
2181                         cmd->command, cmd->argument3);
2182                 ret = -ETIMEDOUT;
2183                 goto out;
2184         }
2185
2186         status = ufshcd_get_upmcrs(hba);
2187         if (status != PWR_LOCAL) {
2188                 dev_err(hba->dev,
2189                         "pwr ctrl cmd 0x%0x failed, host umpcrs:0x%x\n",
2190                         cmd->command, status);
2191                 ret = (status != PWR_OK) ? status : -1;
2192         }
2193 out:
2194         spin_lock_irqsave(hba->host->host_lock, flags);
2195         hba->uic_async_done = NULL;
2196         spin_unlock_irqrestore(hba->host->host_lock, flags);
2197         mutex_unlock(&hba->uic_cmd_mutex);
2198
2199         return ret;
2200 }
2201
2202 /**
2203  * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
2204  *                              using DME_SET primitives.
2205  * @hba: per adapter instance
2206  * @mode: powr mode value
2207  *
2208  * Returns 0 on success, non-zero value on failure
2209  */
2210 static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
2211 {
2212         struct uic_command uic_cmd = {0};
2213         int ret;
2214
2215         uic_cmd.command = UIC_CMD_DME_SET;
2216         uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE);
2217         uic_cmd.argument3 = mode;
2218         ufshcd_hold(hba, false);
2219         ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
2220         ufshcd_release(hba);
2221
2222         return ret;
2223 }
2224
2225 static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
2226 {
2227         struct uic_command uic_cmd = {0};
2228
2229         uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
2230
2231         return ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
2232 }
2233
2234 static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
2235 {
2236         struct uic_command uic_cmd = {0};
2237         int ret;
2238
2239         uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
2240         ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
2241         if (ret) {
2242                 ufshcd_set_link_off(hba);
2243                 ret = ufshcd_host_reset_and_restore(hba);
2244         }
2245
2246         return ret;
2247 }
2248
2249 /**
2250  * ufshcd_get_max_pwr_mode - reads the max power mode negotiated with device
2251  * @hba: per-adapter instance
2252  */
2253 static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
2254 {
2255         struct ufs_pa_layer_attr *pwr_info = &hba->max_pwr_info.info;
2256
2257         if (hba->max_pwr_info.is_valid)
2258                 return 0;
2259
2260         pwr_info->pwr_tx = FASTAUTO_MODE;
2261         pwr_info->pwr_rx = FASTAUTO_MODE;
2262         pwr_info->hs_rate = PA_HS_MODE_B;
2263
2264         /* Get the connected lane count */
2265         ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDRXDATALANES),
2266                         &pwr_info->lane_rx);
2267         ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
2268                         &pwr_info->lane_tx);
2269
2270         if (!pwr_info->lane_rx || !pwr_info->lane_tx) {
2271                 dev_err(hba->dev, "%s: invalid connected lanes value. rx=%d, tx=%d\n",
2272                                 __func__,
2273                                 pwr_info->lane_rx,
2274                                 pwr_info->lane_tx);
2275                 return -EINVAL;
2276         }
2277
2278         /*
2279          * First, get the maximum gears of HS speed.
2280          * If a zero value, it means there is no HSGEAR capability.
2281          * Then, get the maximum gears of PWM speed.
2282          */
2283         ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR), &pwr_info->gear_rx);
2284         if (!pwr_info->gear_rx) {
2285                 ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
2286                                 &pwr_info->gear_rx);
2287                 if (!pwr_info->gear_rx) {
2288                         dev_err(hba->dev, "%s: invalid max pwm rx gear read = %d\n",
2289                                 __func__, pwr_info->gear_rx);
2290                         return -EINVAL;
2291                 }
2292                 pwr_info->pwr_rx = SLOWAUTO_MODE;
2293         }
2294
2295         ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR),
2296                         &pwr_info->gear_tx);
2297         if (!pwr_info->gear_tx) {
2298                 ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
2299                                 &pwr_info->gear_tx);
2300                 if (!pwr_info->gear_tx) {
2301                         dev_err(hba->dev, "%s: invalid max pwm tx gear read = %d\n",
2302                                 __func__, pwr_info->gear_tx);
2303                         return -EINVAL;
2304                 }
2305                 pwr_info->pwr_tx = SLOWAUTO_MODE;
2306         }
2307
2308         hba->max_pwr_info.is_valid = true;
2309         return 0;
2310 }
2311
2312 static int ufshcd_change_power_mode(struct ufs_hba *hba,
2313                              struct ufs_pa_layer_attr *pwr_mode)
2314 {
2315         int ret;
2316
2317         /* if already configured to the requested pwr_mode */
2318         if (pwr_mode->gear_rx == hba->pwr_info.gear_rx &&
2319             pwr_mode->gear_tx == hba->pwr_info.gear_tx &&
2320             pwr_mode->lane_rx == hba->pwr_info.lane_rx &&
2321             pwr_mode->lane_tx == hba->pwr_info.lane_tx &&
2322             pwr_mode->pwr_rx == hba->pwr_info.pwr_rx &&
2323             pwr_mode->pwr_tx == hba->pwr_info.pwr_tx &&
2324             pwr_mode->hs_rate == hba->pwr_info.hs_rate) {
2325                 dev_dbg(hba->dev, "%s: power already configured\n", __func__);
2326                 return 0;
2327         }
2328
2329         /*
2330          * Configure attributes for power mode change with below.
2331          * - PA_RXGEAR, PA_ACTIVERXDATALANES, PA_RXTERMINATION,
2332          * - PA_TXGEAR, PA_ACTIVETXDATALANES, PA_TXTERMINATION,
2333          * - PA_HSSERIES
2334          */
2335         ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), pwr_mode->gear_rx);
2336         ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
2337                         pwr_mode->lane_rx);
2338         if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
2339                         pwr_mode->pwr_rx == FAST_MODE)
2340                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), TRUE);
2341         else
2342                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), FALSE);
2343
2344         ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), pwr_mode->gear_tx);
2345         ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
2346                         pwr_mode->lane_tx);
2347         if (pwr_mode->pwr_tx == FASTAUTO_MODE ||
2348                         pwr_mode->pwr_tx == FAST_MODE)
2349                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), TRUE);
2350         else
2351                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), FALSE);
2352
2353         if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
2354             pwr_mode->pwr_tx == FASTAUTO_MODE ||
2355             pwr_mode->pwr_rx == FAST_MODE ||
2356             pwr_mode->pwr_tx == FAST_MODE)
2357                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
2358                                                 pwr_mode->hs_rate);
2359
2360         ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
2361                         | pwr_mode->pwr_tx);
2362
2363         if (ret) {
2364                 dev_err(hba->dev,
2365                         "%s: power mode change failed %d\n", __func__, ret);
2366         } else {
2367                 if (hba->vops && hba->vops->pwr_change_notify)
2368                         hba->vops->pwr_change_notify(hba,
2369                                 POST_CHANGE, NULL, pwr_mode);
2370
2371                 memcpy(&hba->pwr_info, pwr_mode,
2372                         sizeof(struct ufs_pa_layer_attr));
2373         }
2374
2375         return ret;
2376 }
2377
2378 /**
2379  * ufshcd_config_pwr_mode - configure a new power mode
2380  * @hba: per-adapter instance
2381  * @desired_pwr_mode: desired power configuration
2382  */
2383 static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
2384                 struct ufs_pa_layer_attr *desired_pwr_mode)
2385 {
2386         struct ufs_pa_layer_attr final_params = { 0 };
2387         int ret;
2388
2389         if (hba->vops && hba->vops->pwr_change_notify)
2390                 hba->vops->pwr_change_notify(hba,
2391                      PRE_CHANGE, desired_pwr_mode, &final_params);
2392         else
2393                 memcpy(&final_params, desired_pwr_mode, sizeof(final_params));
2394
2395         ret = ufshcd_change_power_mode(hba, &final_params);
2396
2397         return ret;
2398 }
2399
2400 /**
2401  * ufshcd_complete_dev_init() - checks device readiness
2402  * hba: per-adapter instance
2403  *
2404  * Set fDeviceInit flag and poll until device toggles it.
2405  */
2406 static int ufshcd_complete_dev_init(struct ufs_hba *hba)
2407 {
2408         int i, retries, err = 0;
2409         bool flag_res = 1;
2410
2411         for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
2412                 /* Set the fDeviceInit flag */
2413                 err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
2414                                         QUERY_FLAG_IDN_FDEVICEINIT, NULL);
2415                 if (!err || err == -ETIMEDOUT)
2416                         break;
2417                 dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
2418         }
2419         if (err) {
2420                 dev_err(hba->dev,
2421                         "%s setting fDeviceInit flag failed with error %d\n",
2422                         __func__, err);
2423                 goto out;
2424         }
2425
2426         /* poll for max. 100 iterations for fDeviceInit flag to clear */
2427         for (i = 0; i < 100 && !err && flag_res; i++) {
2428                 for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
2429                         err = ufshcd_query_flag(hba,
2430                                         UPIU_QUERY_OPCODE_READ_FLAG,
2431                                         QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
2432                         if (!err || err == -ETIMEDOUT)
2433                                 break;
2434                         dev_dbg(hba->dev, "%s: error %d retrying\n", __func__,
2435                                         err);
2436                 }
2437         }
2438         if (err)
2439                 dev_err(hba->dev,
2440                         "%s reading fDeviceInit flag failed with error %d\n",
2441                         __func__, err);
2442         else if (flag_res)
2443                 dev_err(hba->dev,
2444                         "%s fDeviceInit was not cleared by the device\n",
2445                         __func__);
2446
2447 out:
2448         return err;
2449 }
2450
2451 /**
2452  * ufshcd_make_hba_operational - Make UFS controller operational
2453  * @hba: per adapter instance
2454  *
2455  * To bring UFS host controller to operational state,
2456  * 1. Enable required interrupts
2457  * 2. Configure interrupt aggregation
2458  * 3. Program UTRL and UTMRL base addres
2459  * 4. Configure run-stop-registers
2460  *
2461  * Returns 0 on success, non-zero value on failure
2462  */
2463 static int ufshcd_make_hba_operational(struct ufs_hba *hba)
2464 {
2465         int err = 0;
2466         u32 reg;
2467
2468         /* Enable required interrupts */
2469         ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);
2470
2471         /* Configure interrupt aggregation */
2472         ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
2473
2474         /* Configure UTRL and UTMRL base address registers */
2475         ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
2476                         REG_UTP_TRANSFER_REQ_LIST_BASE_L);
2477         ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
2478                         REG_UTP_TRANSFER_REQ_LIST_BASE_H);
2479         ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
2480                         REG_UTP_TASK_REQ_LIST_BASE_L);
2481         ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
2482                         REG_UTP_TASK_REQ_LIST_BASE_H);
2483
2484         /*
2485          * UCRDY, UTMRLDY and UTRLRDY bits must be 1
2486          * DEI, HEI bits must be 0
2487          */
2488         reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
2489         if (!(ufshcd_get_lists_status(reg))) {
2490                 ufshcd_enable_run_stop_reg(hba);
2491         } else {
2492                 dev_err(hba->dev,
2493                         "Host controller not ready to process requests");
2494                 err = -EIO;
2495                 goto out;
2496         }
2497
2498 out:
2499         return err;
2500 }
2501
2502 /**
2503  * ufshcd_hba_enable - initialize the controller
2504  * @hba: per adapter instance
2505  *
2506  * The controller resets itself and controller firmware initialization
2507  * sequence kicks off. When controller is ready it will set
2508  * the Host Controller Enable bit to 1.
2509  *
2510  * Returns 0 on success, non-zero value on failure
2511  */
2512 static int ufshcd_hba_enable(struct ufs_hba *hba)
2513 {
2514         int retry;
2515
2516         /*
2517          * msleep of 1 and 5 used in this function might result in msleep(20),
2518          * but it was necessary to send the UFS FPGA to reset mode during
2519          * development and testing of this driver. msleep can be changed to
2520          * mdelay and retry count can be reduced based on the controller.
2521          */
2522         if (!ufshcd_is_hba_active(hba)) {
2523
2524                 /* change controller state to "reset state" */
2525                 ufshcd_hba_stop(hba);
2526
2527                 /*
2528                  * This delay is based on the testing done with UFS host
2529                  * controller FPGA. The delay can be changed based on the
2530                  * host controller used.
2531                  */
2532                 msleep(5);
2533         }
2534
2535         /* UniPro link is disabled at this point */
2536         ufshcd_set_link_off(hba);
2537
2538         if (hba->vops && hba->vops->hce_enable_notify)
2539                 hba->vops->hce_enable_notify(hba, PRE_CHANGE);
2540
2541         /* start controller initialization sequence */
2542         ufshcd_hba_start(hba);
2543
2544         /*
2545          * To initialize a UFS host controller HCE bit must be set to 1.
2546          * During initialization the HCE bit value changes from 1->0->1.
2547          * When the host controller completes initialization sequence
2548          * it sets the value of HCE bit to 1. The same HCE bit is read back
2549          * to check if the controller has completed initialization sequence.
2550          * So without this delay the value HCE = 1, set in the previous
2551          * instruction might be read back.
2552          * This delay can be changed based on the controller.
2553          */
2554         msleep(1);
2555
2556         /* wait for the host controller to complete initialization */
2557         retry = 10;
2558         while (ufshcd_is_hba_active(hba)) {
2559                 if (retry) {
2560                         retry--;
2561                 } else {
2562                         dev_err(hba->dev,
2563                                 "Controller enable failed\n");
2564                         return -EIO;
2565                 }
2566                 msleep(5);
2567         }
2568
2569         /* enable UIC related interrupts */
2570         ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
2571
2572         if (hba->vops && hba->vops->hce_enable_notify)
2573                 hba->vops->hce_enable_notify(hba, POST_CHANGE);
2574
2575         return 0;
2576 }
2577
2578 /**
2579  * ufshcd_link_startup - Initialize unipro link startup
2580  * @hba: per adapter instance
2581  *
2582  * Returns 0 for success, non-zero in case of failure
2583  */
2584 static int ufshcd_link_startup(struct ufs_hba *hba)
2585 {
2586         int ret;
2587         int retries = DME_LINKSTARTUP_RETRIES;
2588
2589         do {
2590                 if (hba->vops && hba->vops->link_startup_notify)
2591                         hba->vops->link_startup_notify(hba, PRE_CHANGE);
2592
2593                 ret = ufshcd_dme_link_startup(hba);
2594
2595                 /* check if device is detected by inter-connect layer */
2596                 if (!ret && !ufshcd_is_device_present(hba)) {
2597                         dev_err(hba->dev, "%s: Device not present\n", __func__);
2598                         ret = -ENXIO;
2599                         goto out;
2600                 }
2601
2602                 /*
2603                  * DME link lost indication is only received when link is up,
2604                  * but we can't be sure if the link is up until link startup
2605                  * succeeds. So reset the local Uni-Pro and try again.
2606                  */
2607                 if (ret && ufshcd_hba_enable(hba))
2608                         goto out;
2609         } while (ret && retries--);
2610
2611         if (ret)
2612                 /* failed to get the link up... retire */
2613                 goto out;
2614
2615         /* Include any host controller configuration via UIC commands */
2616         if (hba->vops && hba->vops->link_startup_notify) {
2617                 ret = hba->vops->link_startup_notify(hba, POST_CHANGE);
2618                 if (ret)
2619                         goto out;
2620         }
2621
2622         ret = ufshcd_make_hba_operational(hba);
2623 out:
2624         if (ret)
2625                 dev_err(hba->dev, "link startup failed %d\n", ret);
2626         return ret;
2627 }
2628
2629 /**
2630  * ufshcd_verify_dev_init() - Verify device initialization
2631  * @hba: per-adapter instance
2632  *
2633  * Send NOP OUT UPIU and wait for NOP IN response to check whether the
2634  * device Transport Protocol (UTP) layer is ready after a reset.
2635  * If the UTP layer at the device side is not initialized, it may
2636  * not respond with NOP IN UPIU within timeout of %NOP_OUT_TIMEOUT
2637  * and we retry sending NOP OUT for %NOP_OUT_RETRIES iterations.
2638  */
2639 static int ufshcd_verify_dev_init(struct ufs_hba *hba)
2640 {
2641         int err = 0;
2642         int retries;
2643
2644         ufshcd_hold(hba, false);
2645         mutex_lock(&hba->dev_cmd.lock);
2646         for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
2647                 err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
2648                                                NOP_OUT_TIMEOUT);
2649
2650                 if (!err || err == -ETIMEDOUT)
2651                         break;
2652
2653                 dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
2654         }
2655         mutex_unlock(&hba->dev_cmd.lock);
2656         ufshcd_release(hba);
2657
2658         if (err)
2659                 dev_err(hba->dev, "%s: NOP OUT failed %d\n", __func__, err);
2660         return err;
2661 }
2662
2663 /**
2664  * ufshcd_set_queue_depth - set lun queue depth
2665  * @sdev: pointer to SCSI device
2666  *
2667  * Read bLUQueueDepth value and activate scsi tagged command
2668  * queueing. For WLUN, queue depth is set to 1. For best-effort
2669  * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
2670  * value that host can queue.
2671  */
2672 static void ufshcd_set_queue_depth(struct scsi_device *sdev)
2673 {
2674         int ret = 0;
2675         u8 lun_qdepth;
2676         struct ufs_hba *hba;
2677
2678         hba = shost_priv(sdev->host);
2679
2680         lun_qdepth = hba->nutrs;
2681         ret = ufshcd_read_unit_desc_param(hba,
2682                                           ufshcd_scsi_to_upiu_lun(sdev->lun),
2683                                           UNIT_DESC_PARAM_LU_Q_DEPTH,
2684                                           &lun_qdepth,
2685                                           sizeof(lun_qdepth));
2686
2687         /* Some WLUN doesn't support unit descriptor */
2688         if (ret == -EOPNOTSUPP)
2689                 lun_qdepth = 1;
2690         else if (!lun_qdepth)
2691                 /* eventually, we can figure out the real queue depth */
2692                 lun_qdepth = hba->nutrs;
2693         else
2694                 lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);
2695
2696         dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
2697                         __func__, lun_qdepth);
2698         scsi_activate_tcq(sdev, lun_qdepth);
2699 }
2700
2701 /*
2702  * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
2703  * @hba: per-adapter instance
2704  * @lun: UFS device lun id
2705  * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
2706  *
2707  * Returns 0 in case of success and b_lu_write_protect status would be returned
2708  * @b_lu_write_protect parameter.
2709  * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
2710  * Returns -EINVAL in case of invalid parameters passed to this function.
2711  */
2712 static int ufshcd_get_lu_wp(struct ufs_hba *hba,
2713                             u8 lun,
2714                             u8 *b_lu_write_protect)
2715 {
2716         int ret;
2717
2718         if (!b_lu_write_protect)
2719                 ret = -EINVAL;
2720         /*
2721          * According to UFS device spec, RPMB LU can't be write
2722          * protected so skip reading bLUWriteProtect parameter for
2723          * it. For other W-LUs, UNIT DESCRIPTOR is not available.
2724          */
2725         else if (lun >= UFS_UPIU_MAX_GENERAL_LUN)
2726                 ret = -ENOTSUPP;
2727         else
2728                 ret = ufshcd_read_unit_desc_param(hba,
2729                                           lun,
2730                                           UNIT_DESC_PARAM_LU_WR_PROTECT,
2731                                           b_lu_write_protect,
2732                                           sizeof(*b_lu_write_protect));
2733         return ret;
2734 }
2735
2736 /**
2737  * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
2738  * status
2739  * @hba: per-adapter instance
2740  * @sdev: pointer to SCSI device
2741  *
2742  */
2743 static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
2744                                                     struct scsi_device *sdev)
2745 {
2746         if (hba->dev_info.f_power_on_wp_en &&
2747             !hba->dev_info.is_lu_power_on_wp) {
2748                 u8 b_lu_write_protect;
2749
2750                 if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
2751                                       &b_lu_write_protect) &&
2752                     (b_lu_write_protect == UFS_LU_POWER_ON_WP))
2753                         hba->dev_info.is_lu_power_on_wp = true;
2754         }
2755 }
2756
2757 /**
2758  * ufshcd_slave_alloc - handle initial SCSI device configurations
2759  * @sdev: pointer to SCSI device
2760  *
2761  * Returns success
2762  */
2763 static int ufshcd_slave_alloc(struct scsi_device *sdev)
2764 {
2765         struct ufs_hba *hba;
2766
2767         hba = shost_priv(sdev->host);
2768         sdev->tagged_supported = 1;
2769
2770         /* Mode sense(6) is not supported by UFS, so use Mode sense(10) */
2771         sdev->use_10_for_ms = 1;
2772         scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2773
2774         /* allow SCSI layer to restart the device in case of errors */
2775         sdev->allow_restart = 1;
2776
2777         /* REPORT SUPPORTED OPERATION CODES is not supported */
2778         sdev->no_report_opcodes = 1;
2779
2780
2781         ufshcd_set_queue_depth(sdev);
2782
2783         ufshcd_get_lu_power_on_wp_status(hba, sdev);
2784
2785         return 0;
2786 }
2787
2788 /**
2789  * ufshcd_change_queue_depth - change queue depth
2790  * @sdev: pointer to SCSI device
2791  * @depth: required depth to set
2792  * @reason: reason for changing the depth
2793  *
2794  * Change queue depth according to the reason and make sure
2795  * the max. limits are not crossed.
2796  */
2797 static int ufshcd_change_queue_depth(struct scsi_device *sdev,
2798                 int depth, int reason)
2799 {
2800         struct ufs_hba *hba = shost_priv(sdev->host);
2801
2802         if (depth > hba->nutrs)
2803                 depth = hba->nutrs;
2804
2805         switch (reason) {
2806         case SCSI_QDEPTH_DEFAULT:
2807         case SCSI_QDEPTH_RAMP_UP:
2808                 if (!sdev->tagged_supported)
2809                         depth = 1;
2810                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
2811                 break;
2812         case SCSI_QDEPTH_QFULL:
2813                 scsi_track_queue_full(sdev, depth);
2814                 break;
2815         default:
2816                 return -EOPNOTSUPP;
2817         }
2818
2819         return depth;
2820 }
2821
2822 /**
2823  * ufshcd_slave_configure - adjust SCSI device configurations
2824  * @sdev: pointer to SCSI device
2825  */
2826 static int ufshcd_slave_configure(struct scsi_device *sdev)
2827 {
2828         struct request_queue *q = sdev->request_queue;
2829
2830         blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
2831         blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
2832
2833         return 0;
2834 }
2835
2836 /**
2837  * ufshcd_slave_destroy - remove SCSI device configurations
2838  * @sdev: pointer to SCSI device
2839  */
2840 static void ufshcd_slave_destroy(struct scsi_device *sdev)
2841 {
2842         struct ufs_hba *hba;
2843
2844         hba = shost_priv(sdev->host);
2845         scsi_deactivate_tcq(sdev, hba->nutrs);
2846         /* Drop the reference as it won't be needed anymore */
2847         if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN)
2848                 hba->sdev_ufs_device = NULL;
2849 }
2850
2851 /**
2852  * ufshcd_task_req_compl - handle task management request completion
2853  * @hba: per adapter instance
2854  * @index: index of the completed request
2855  * @resp: task management service response
2856  *
2857  * Returns non-zero value on error, zero on success
2858  */
2859 static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index, u8 *resp)
2860 {
2861         struct utp_task_req_desc *task_req_descp;
2862         struct utp_upiu_task_rsp *task_rsp_upiup;
2863         unsigned long flags;
2864         int ocs_value;
2865         int task_result;
2866
2867         spin_lock_irqsave(hba->host->host_lock, flags);
2868
2869         /* Clear completed tasks from outstanding_tasks */
2870         __clear_bit(index, &hba->outstanding_tasks);
2871
2872         task_req_descp = hba->utmrdl_base_addr;
2873         ocs_value = ufshcd_get_tmr_ocs(&task_req_descp[index]);
2874
2875         if (ocs_value == OCS_SUCCESS) {
2876                 task_rsp_upiup = (struct utp_upiu_task_rsp *)
2877                                 task_req_descp[index].task_rsp_upiu;
2878                 task_result = be32_to_cpu(task_rsp_upiup->header.dword_1);
2879                 task_result = ((task_result & MASK_TASK_RESPONSE) >> 8);
2880                 if (resp)
2881                         *resp = (u8)task_result;
2882         } else {
2883                 dev_err(hba->dev, "%s: failed, ocs = 0x%x\n",
2884                                 __func__, ocs_value);
2885         }
2886         spin_unlock_irqrestore(hba->host->host_lock, flags);
2887
2888         return ocs_value;
2889 }
2890
2891 /**
2892  * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status
2893  * @lrb: pointer to local reference block of completed command
2894  * @scsi_status: SCSI command status
2895  *
2896  * Returns value base on SCSI command status
2897  */
2898 static inline int
2899 ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
2900 {
2901         int result = 0;
2902
2903         switch (scsi_status) {
2904         case SAM_STAT_CHECK_CONDITION:
2905                 ufshcd_copy_sense_data(lrbp);
2906         case SAM_STAT_GOOD:
2907                 result |= DID_OK << 16 |
2908                           COMMAND_COMPLETE << 8 |
2909                           scsi_status;
2910                 break;
2911         case SAM_STAT_TASK_SET_FULL:
2912         case SAM_STAT_BUSY:
2913         case SAM_STAT_TASK_ABORTED:
2914                 ufshcd_copy_sense_data(lrbp);
2915                 result |= scsi_status;
2916                 break;
2917         default:
2918                 result |= DID_ERROR << 16;
2919                 break;
2920         } /* end of switch */
2921
2922         return result;
2923 }
2924
2925 /**
2926  * ufshcd_transfer_rsp_status - Get overall status of the response
2927  * @hba: per adapter instance
2928  * @lrb: pointer to local reference block of completed command
2929  *
2930  * Returns result of the command to notify SCSI midlayer
2931  */
2932 static inline int
2933 ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
2934 {
2935         int result = 0;
2936         int scsi_status;
2937         int ocs;
2938
2939         /* overall command status of utrd */
2940         ocs = ufshcd_get_tr_ocs(lrbp);
2941
2942         switch (ocs) {
2943         case OCS_SUCCESS:
2944                 result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
2945
2946                 switch (result) {
2947                 case UPIU_TRANSACTION_RESPONSE:
2948                         /*
2949                          * get the response UPIU result to extract
2950                          * the SCSI command status
2951                          */
2952                         result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);
2953
2954                         /*
2955                          * get the result based on SCSI status response
2956                          * to notify the SCSI midlayer of the command status
2957                          */
2958                         scsi_status = result & MASK_SCSI_STATUS;
2959                         result = ufshcd_scsi_cmd_status(lrbp, scsi_status);
2960
2961                         if (ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
2962                                 schedule_work(&hba->eeh_work);
2963                         break;
2964                 case UPIU_TRANSACTION_REJECT_UPIU:
2965                         /* TODO: handle Reject UPIU Response */
2966                         result = DID_ERROR << 16;
2967                         dev_err(hba->dev,
2968                                 "Reject UPIU not fully implemented\n");
2969                         break;
2970                 default:
2971                         result = DID_ERROR << 16;
2972                         dev_err(hba->dev,
2973                                 "Unexpected request response code = %x\n",
2974                                 result);
2975                         break;
2976                 }
2977                 break;
2978         case OCS_ABORTED:
2979                 result |= DID_ABORT << 16;
2980                 break;
2981         case OCS_INVALID_COMMAND_STATUS:
2982                 result |= DID_REQUEUE << 16;
2983                 break;
2984         case OCS_INVALID_CMD_TABLE_ATTR:
2985         case OCS_INVALID_PRDT_ATTR:
2986         case OCS_MISMATCH_DATA_BUF_SIZE:
2987         case OCS_MISMATCH_RESP_UPIU_SIZE:
2988         case OCS_PEER_COMM_FAILURE:
2989         case OCS_FATAL_ERROR:
2990         default:
2991                 result |= DID_ERROR << 16;
2992                 dev_err(hba->dev,
2993                 "OCS error from controller = %x\n", ocs);
2994                 break;
2995         } /* end of switch */
2996
2997         return result;
2998 }
2999
3000 /**
3001  * ufshcd_uic_cmd_compl - handle completion of uic command
3002  * @hba: per adapter instance
3003  * @intr_status: interrupt status generated by the controller
3004  */
3005 static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
3006 {
3007         if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
3008                 hba->active_uic_cmd->argument2 |=
3009                         ufshcd_get_uic_cmd_result(hba);
3010                 hba->active_uic_cmd->argument3 =
3011                         ufshcd_get_dme_attr_val(hba);
3012                 complete(&hba->active_uic_cmd->done);
3013         }
3014
3015         if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done)
3016                 complete(hba->uic_async_done);
3017 }
3018
3019 /**
3020  * ufshcd_transfer_req_compl - handle SCSI and query command completion
3021  * @hba: per adapter instance
3022  */
3023 static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
3024 {
3025         struct ufshcd_lrb *lrbp;
3026         struct scsi_cmnd *cmd;
3027         unsigned long completed_reqs;
3028         u32 tr_doorbell;
3029         int result;
3030         int index;
3031
3032         /* Resetting interrupt aggregation counters first and reading the
3033          * DOOR_BELL afterward allows us to handle all the completed requests.
3034          * In order to prevent other interrupts starvation the DB is read once
3035          * after reset. The down side of this solution is the possibility of
3036          * false interrupt if device completes another request after resetting
3037          * aggregation and before reading the DB.
3038          */
3039         ufshcd_reset_intr_aggr(hba);
3040
3041         tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
3042         completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
3043
3044         for_each_set_bit(index, &completed_reqs, hba->nutrs) {
3045                 lrbp = &hba->lrb[index];
3046                 cmd = lrbp->cmd;
3047                 if (cmd) {
3048                         result = ufshcd_transfer_rsp_status(hba, lrbp);
3049                         scsi_dma_unmap(cmd);
3050                         cmd->result = result;
3051                         /* Mark completed command as NULL in LRB */
3052                         lrbp->cmd = NULL;
3053                         clear_bit_unlock(index, &hba->lrb_in_use);
3054                         /* Do not touch lrbp after scsi done */
3055                         cmd->scsi_done(cmd);
3056                         __ufshcd_release(hba);
3057                 } else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE) {
3058                         if (hba->dev_cmd.complete)
3059                                 complete(hba->dev_cmd.complete);
3060                 }
3061         }
3062
3063         /* clear corresponding bits of completed commands */
3064         hba->outstanding_reqs ^= completed_reqs;
3065
3066         ufshcd_clk_scaling_update_busy(hba);
3067
3068         /* we might have free'd some tags above */
3069         wake_up(&hba->dev_cmd.tag_wq);
3070 }
3071
3072 /**
3073  * ufshcd_disable_ee - disable exception event
3074  * @hba: per-adapter instance
3075  * @mask: exception event to disable
3076  *
3077  * Disables exception event in the device so that the EVENT_ALERT
3078  * bit is not set.
3079  *
3080  * Returns zero on success, non-zero error value on failure.
3081  */
3082 static int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
3083 {
3084         int err = 0;
3085         u32 val;
3086
3087         if (!(hba->ee_ctrl_mask & mask))
3088                 goto out;
3089
3090         val = hba->ee_ctrl_mask & ~mask;
3091         val &= 0xFFFF; /* 2 bytes */
3092         err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
3093                         QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
3094         if (!err)
3095                 hba->ee_ctrl_mask &= ~mask;
3096 out:
3097         return err;
3098 }
3099
3100 /**
3101  * ufshcd_enable_ee - enable exception event
3102  * @hba: per-adapter instance
3103  * @mask: exception event to enable
3104  *
3105  * Enable corresponding exception event in the device to allow
3106  * device to alert host in critical scenarios.
3107  *
3108  * Returns zero on success, non-zero error value on failure.
3109  */
3110 static int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
3111 {
3112         int err = 0;
3113         u32 val;
3114
3115         if (hba->ee_ctrl_mask & mask)
3116                 goto out;
3117
3118         val = hba->ee_ctrl_mask | mask;
3119         val &= 0xFFFF; /* 2 bytes */
3120         err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
3121                         QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
3122         if (!err)
3123                 hba->ee_ctrl_mask |= mask;
3124 out:
3125         return err;
3126 }
3127
3128 /**
3129  * ufshcd_enable_auto_bkops - Allow device managed BKOPS
3130  * @hba: per-adapter instance
3131  *
3132  * Allow device to manage background operations on its own. Enabling
3133  * this might lead to inconsistent latencies during normal data transfers
3134  * as the device is allowed to manage its own way of handling background
3135  * operations.
3136  *
3137  * Returns zero on success, non-zero on failure.
3138  */
3139 static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
3140 {
3141         int err = 0;
3142
3143         if (hba->auto_bkops_enabled)
3144                 goto out;
3145
3146         err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
3147                         QUERY_FLAG_IDN_BKOPS_EN, NULL);
3148         if (err) {
3149                 dev_err(hba->dev, "%s: failed to enable bkops %d\n",
3150                                 __func__, err);
3151                 goto out;
3152         }
3153
3154         hba->auto_bkops_enabled = true;
3155
3156         /* No need of URGENT_BKOPS exception from the device */
3157         err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
3158         if (err)
3159                 dev_err(hba->dev, "%s: failed to disable exception event %d\n",
3160                                 __func__, err);
3161 out:
3162         return err;
3163 }
3164
3165 /**
3166  * ufshcd_disable_auto_bkops - block device in doing background operations
3167  * @hba: per-adapter instance
3168  *
3169  * Disabling background operations improves command response latency but
3170  * has drawback of device moving into critical state where the device is
3171  * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
3172  * host is idle so that BKOPS are managed effectively without any negative
3173  * impacts.
3174  *
3175  * Returns zero on success, non-zero on failure.
3176  */
3177 static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
3178 {
3179         int err = 0;
3180
3181         if (!hba->auto_bkops_enabled)
3182                 goto out;
3183
3184         /*
3185          * If host assisted BKOPs is to be enabled, make sure
3186          * urgent bkops exception is allowed.
3187          */
3188         err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
3189         if (err) {
3190                 dev_err(hba->dev, "%s: failed to enable exception event %d\n",
3191                                 __func__, err);
3192                 goto out;
3193         }
3194
3195         err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
3196                         QUERY_FLAG_IDN_BKOPS_EN, NULL);
3197         if (err) {
3198                 dev_err(hba->dev, "%s: failed to disable bkops %d\n",
3199                                 __func__, err);
3200                 ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
3201                 goto out;
3202         }
3203
3204         hba->auto_bkops_enabled = false;
3205 out:
3206         return err;
3207 }
3208
3209 /**
3210  * ufshcd_force_reset_auto_bkops - force enable of auto bkops
3211  * @hba: per adapter instance
3212  *
3213  * After a device reset the device may toggle the BKOPS_EN flag
3214  * to default value. The s/w tracking variables should be updated
3215  * as well. Do this by forcing enable of auto bkops.
3216  */
3217 static void  ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
3218 {
3219         hba->auto_bkops_enabled = false;
3220         hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
3221         ufshcd_enable_auto_bkops(hba);
3222 }
3223
3224 static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
3225 {
3226         return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
3227                         QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
3228 }
3229
3230 /**
3231  * ufshcd_bkops_ctrl - control the auto bkops based on current bkops status
3232  * @hba: per-adapter instance
3233  * @status: bkops_status value
3234  *
3235  * Read the bkops_status from the UFS device and Enable fBackgroundOpsEn
3236  * flag in the device to permit background operations if the device
3237  * bkops_status is greater than or equal to "status" argument passed to
3238  * this function, disable otherwise.
3239  *
3240  * Returns 0 for success, non-zero in case of failure.
3241  *
3242  * NOTE: Caller of this function can check the "hba->auto_bkops_enabled" flag
3243  * to know whether auto bkops is enabled or disabled after this function
3244  * returns control to it.
3245  */
3246 static int ufshcd_bkops_ctrl(struct ufs_hba *hba,
3247                              enum bkops_status status)
3248 {
3249         int err;
3250         u32 curr_status = 0;
3251
3252         err = ufshcd_get_bkops_status(hba, &curr_status);
3253         if (err) {
3254                 dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
3255                                 __func__, err);
3256                 goto out;
3257         } else if (curr_status > BKOPS_STATUS_MAX) {
3258                 dev_err(hba->dev, "%s: invalid BKOPS status %d\n",
3259                                 __func__, curr_status);
3260                 err = -EINVAL;
3261                 goto out;
3262         }
3263
3264         if (curr_status >= status)
3265                 err = ufshcd_enable_auto_bkops(hba);
3266         else
3267                 err = ufshcd_disable_auto_bkops(hba);
3268 out:
3269         return err;
3270 }
3271
3272 /**
3273  * ufshcd_urgent_bkops - handle urgent bkops exception event
3274  * @hba: per-adapter instance
3275  *
3276  * Enable fBackgroundOpsEn flag in the device to permit background
3277  * operations.
3278  *
3279  * If BKOPs is enabled, this function returns 0, 1 if the bkops in not enabled
3280  * and negative error value for any other failure.
3281  */
3282 static int ufshcd_urgent_bkops(struct ufs_hba *hba)
3283 {
3284         return ufshcd_bkops_ctrl(hba, BKOPS_STATUS_PERF_IMPACT);
3285 }
3286
3287 static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
3288 {
3289         return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
3290                         QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
3291 }
3292
3293 /**
3294  * ufshcd_exception_event_handler - handle exceptions raised by device
3295  * @work: pointer to work data
3296  *
3297  * Read bExceptionEventStatus attribute from the device and handle the
3298  * exception event accordingly.
3299  */
3300 static void ufshcd_exception_event_handler(struct work_struct *work)
3301 {
3302         struct ufs_hba *hba;
3303         int err;
3304         u32 status = 0;
3305         hba = container_of(work, struct ufs_hba, eeh_work);
3306
3307         pm_runtime_get_sync(hba->dev);
3308         err = ufshcd_get_ee_status(hba, &status);
3309         if (err) {
3310                 dev_err(hba->dev, "%s: failed to get exception status %d\n",
3311                                 __func__, err);
3312                 goto out;
3313         }
3314
3315         status &= hba->ee_ctrl_mask;
3316         if (status & MASK_EE_URGENT_BKOPS) {
3317                 err = ufshcd_urgent_bkops(hba);
3318                 if (err < 0)
3319                         dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
3320                                         __func__, err);
3321         }
3322 out:
3323         pm_runtime_put_sync(hba->dev);
3324         return;
3325 }
3326
3327 /**
3328  * ufshcd_err_handler - handle UFS errors that require s/w attention
3329  * @work: pointer to work structure
3330  */
3331 static void ufshcd_err_handler(struct work_struct *work)
3332 {
3333         struct ufs_hba *hba;
3334         unsigned long flags;
3335         u32 err_xfer = 0;
3336         u32 err_tm = 0;
3337         int err = 0;
3338         int tag;
3339
3340         hba = container_of(work, struct ufs_hba, eh_work);
3341
3342         pm_runtime_get_sync(hba->dev);
3343         ufshcd_hold(hba, false);
3344
3345         spin_lock_irqsave(hba->host->host_lock, flags);
3346         if (hba->ufshcd_state == UFSHCD_STATE_RESET) {
3347                 spin_unlock_irqrestore(hba->host->host_lock, flags);
3348                 goto out;
3349         }
3350
3351         hba->ufshcd_state = UFSHCD_STATE_RESET;
3352         ufshcd_set_eh_in_progress(hba);
3353
3354         /* Complete requests that have door-bell cleared by h/w */
3355         ufshcd_transfer_req_compl(hba);
3356         ufshcd_tmc_handler(hba);
3357         spin_unlock_irqrestore(hba->host->host_lock, flags);
3358
3359         /* Clear pending transfer requests */
3360         for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs)
3361                 if (ufshcd_clear_cmd(hba, tag))
3362                         err_xfer |= 1 << tag;
3363
3364         /* Clear pending task management requests */
3365         for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs)
3366                 if (ufshcd_clear_tm_cmd(hba, tag))
3367                         err_tm |= 1 << tag;
3368
3369         /* Complete the requests that are cleared by s/w */
3370         spin_lock_irqsave(hba->host->host_lock, flags);
3371         ufshcd_transfer_req_compl(hba);
3372         ufshcd_tmc_handler(hba);
3373         spin_unlock_irqrestore(hba->host->host_lock, flags);
3374
3375         /* Fatal errors need reset */
3376         if (err_xfer || err_tm || (hba->saved_err & INT_FATAL_ERRORS) ||
3377                         ((hba->saved_err & UIC_ERROR) &&
3378                          (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR))) {
3379                 err = ufshcd_reset_and_restore(hba);
3380                 if (err) {
3381                         dev_err(hba->dev, "%s: reset and restore failed\n",
3382                                         __func__);
3383                         hba->ufshcd_state = UFSHCD_STATE_ERROR;
3384                 }
3385                 /*
3386                  * Inform scsi mid-layer that we did reset and allow to handle
3387                  * Unit Attention properly.
3388                  */
3389                 scsi_report_bus_reset(hba->host, 0);
3390                 hba->saved_err = 0;
3391                 hba->saved_uic_err = 0;
3392         }
3393         ufshcd_clear_eh_in_progress(hba);
3394
3395 out:
3396         scsi_unblock_requests(hba->host);
3397         ufshcd_release(hba);
3398         pm_runtime_put_sync(hba->dev);
3399 }
3400
3401 /**
3402  * ufshcd_update_uic_error - check and set fatal UIC error flags.
3403  * @hba: per-adapter instance
3404  */
3405 static void ufshcd_update_uic_error(struct ufs_hba *hba)
3406 {
3407         u32 reg;
3408
3409         /* PA_INIT_ERROR is fatal and needs UIC reset */
3410         reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
3411         if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
3412                 hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
3413
3414         /* UIC NL/TL/DME errors needs software retry */
3415         reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
3416         if (reg)
3417                 hba->uic_error |= UFSHCD_UIC_NL_ERROR;
3418
3419         reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
3420         if (reg)
3421                 hba->uic_error |= UFSHCD_UIC_TL_ERROR;
3422
3423         reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
3424         if (reg)
3425                 hba->uic_error |= UFSHCD_UIC_DME_ERROR;
3426
3427         dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
3428                         __func__, hba->uic_error);
3429 }
3430
3431 /**
3432  * ufshcd_check_errors - Check for errors that need s/w attention
3433  * @hba: per-adapter instance
3434  */
3435 static void ufshcd_check_errors(struct ufs_hba *hba)
3436 {
3437         bool queue_eh_work = false;
3438
3439         if (hba->errors & INT_FATAL_ERRORS)
3440                 queue_eh_work = true;
3441
3442         if (hba->errors & UIC_ERROR) {
3443                 hba->uic_error = 0;
3444                 ufshcd_update_uic_error(hba);
3445                 if (hba->uic_error)
3446                         queue_eh_work = true;
3447         }
3448
3449         if (queue_eh_work) {
3450                 /* handle fatal errors only when link is functional */
3451                 if (hba->ufshcd_state == UFSHCD_STATE_OPERATIONAL) {
3452                         /* block commands from scsi mid-layer */
3453                         scsi_block_requests(hba->host);
3454
3455                         /* transfer error masks to sticky bits */
3456                         hba->saved_err |= hba->errors;
3457                         hba->saved_uic_err |= hba->uic_error;
3458
3459                         hba->ufshcd_state = UFSHCD_STATE_ERROR;
3460                         schedule_work(&hba->eh_work);
3461                 }
3462         }
3463         /*
3464          * if (!queue_eh_work) -
3465          * Other errors are either non-fatal where host recovers
3466          * itself without s/w intervention or errors that will be
3467          * handled by the SCSI core layer.
3468          */
3469 }
3470
3471 /**
3472  * ufshcd_tmc_handler - handle task management function completion
3473  * @hba: per adapter instance
3474  */
3475 static void ufshcd_tmc_handler(struct ufs_hba *hba)
3476 {
3477         u32 tm_doorbell;
3478
3479         tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
3480         hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
3481         wake_up(&hba->tm_wq);
3482 }
3483
3484 /**
3485  * ufshcd_sl_intr - Interrupt service routine
3486  * @hba: per adapter instance
3487  * @intr_status: contains interrupts generated by the controller
3488  */
3489 static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
3490 {
3491         hba->errors = UFSHCD_ERROR_MASK & intr_status;
3492         if (hba->errors)
3493                 ufshcd_check_errors(hba);
3494
3495         if (intr_status & UFSHCD_UIC_MASK)
3496                 ufshcd_uic_cmd_compl(hba, intr_status);
3497
3498         if (intr_status & UTP_TASK_REQ_COMPL)
3499                 ufshcd_tmc_handler(hba);
3500
3501         if (intr_status & UTP_TRANSFER_REQ_COMPL)
3502                 ufshcd_transfer_req_compl(hba);
3503 }
3504
3505 /**
3506  * ufshcd_intr - Main interrupt service routine
3507  * @irq: irq number
3508  * @__hba: pointer to adapter instance
3509  *
3510  * Returns IRQ_HANDLED - If interrupt is valid
3511  *              IRQ_NONE - If invalid interrupt
3512  */
3513 static irqreturn_t ufshcd_intr(int irq, void *__hba)
3514 {
3515         u32 intr_status;
3516         irqreturn_t retval = IRQ_NONE;
3517         struct ufs_hba *hba = __hba;
3518
3519         spin_lock(hba->host->host_lock);
3520         intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
3521
3522         if (intr_status) {
3523                 ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
3524                 ufshcd_sl_intr(hba, intr_status);
3525                 retval = IRQ_HANDLED;
3526         }
3527         spin_unlock(hba->host->host_lock);
3528         return retval;
3529 }
3530
3531 static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
3532 {
3533         int err = 0;
3534         u32 mask = 1 << tag;
3535         unsigned long flags;
3536
3537         if (!test_bit(tag, &hba->outstanding_tasks))
3538                 goto out;
3539
3540         spin_lock_irqsave(hba->host->host_lock, flags);
3541         ufshcd_writel(hba, ~(1 << tag), REG_UTP_TASK_REQ_LIST_CLEAR);
3542         spin_unlock_irqrestore(hba->host->host_lock, flags);
3543
3544         /* poll for max. 1 sec to clear door bell register by h/w */
3545         err = ufshcd_wait_for_register(hba,
3546                         REG_UTP_TASK_REQ_DOOR_BELL,
3547                         mask, 0, 1000, 1000);
3548 out:
3549         return err;
3550 }
3551
3552 /**
3553  * ufshcd_issue_tm_cmd - issues task management commands to controller
3554  * @hba: per adapter instance
3555  * @lun_id: LUN ID to which TM command is sent
3556  * @task_id: task ID to which the TM command is applicable
3557  * @tm_function: task management function opcode
3558  * @tm_response: task management service response return value
3559  *
3560  * Returns non-zero value on error, zero on success.
3561  */
3562 static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
3563                 u8 tm_function, u8 *tm_response)
3564 {
3565         struct utp_task_req_desc *task_req_descp;
3566         struct utp_upiu_task_req *task_req_upiup;
3567         struct Scsi_Host *host;
3568         unsigned long flags;
3569         int free_slot;
3570         int err;
3571         int task_tag;
3572
3573         host = hba->host;
3574
3575         /*
3576          * Get free slot, sleep if slots are unavailable.
3577          * Even though we use wait_event() which sleeps indefinitely,
3578          * the maximum wait time is bounded by %TM_CMD_TIMEOUT.
3579          */
3580         wait_event(hba->tm_tag_wq, ufshcd_get_tm_free_slot(hba, &free_slot));
3581         ufshcd_hold(hba, false);
3582
3583         spin_lock_irqsave(host->host_lock, flags);
3584         task_req_descp = hba->utmrdl_base_addr;
3585         task_req_descp += free_slot;
3586
3587         /* Configure task request descriptor */
3588         task_req_descp->header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
3589         task_req_descp->header.dword_2 =
3590                         cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
3591
3592         /* Configure task request UPIU */
3593         task_req_upiup =
3594                 (struct utp_upiu_task_req *) task_req_descp->task_req_upiu;
3595         task_tag = hba->nutrs + free_slot;
3596         task_req_upiup->header.dword_0 =
3597                 UPIU_HEADER_DWORD(UPIU_TRANSACTION_TASK_REQ, 0,
3598                                               lun_id, task_tag);
3599         task_req_upiup->header.dword_1 =
3600                 UPIU_HEADER_DWORD(0, tm_function, 0, 0);
3601         /*
3602          * The host shall provide the same value for LUN field in the basic
3603          * header and for Input Parameter.
3604          */
3605         task_req_upiup->input_param1 = cpu_to_be32(lun_id);
3606         task_req_upiup->input_param2 = cpu_to_be32(task_id);
3607
3608         /* send command to the controller */
3609         __set_bit(free_slot, &hba->outstanding_tasks);
3610         ufshcd_writel(hba, 1 << free_slot, REG_UTP_TASK_REQ_DOOR_BELL);
3611
3612         spin_unlock_irqrestore(host->host_lock, flags);
3613
3614         /* wait until the task management command is completed */
3615         err = wait_event_timeout(hba->tm_wq,
3616                         test_bit(free_slot, &hba->tm_condition),
3617                         msecs_to_jiffies(TM_CMD_TIMEOUT));
3618         if (!err) {
3619                 dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
3620                                 __func__, tm_function);
3621                 if (ufshcd_clear_tm_cmd(hba, free_slot))
3622                         dev_WARN(hba->dev, "%s: unable clear tm cmd (slot %d) after timeout\n",
3623                                         __func__, free_slot);
3624                 err = -ETIMEDOUT;
3625         } else {
3626                 err = ufshcd_task_req_compl(hba, free_slot, tm_response);
3627         }
3628
3629         clear_bit(free_slot, &hba->tm_condition);
3630         ufshcd_put_tm_slot(hba, free_slot);
3631         wake_up(&hba->tm_tag_wq);
3632
3633         ufshcd_release(hba);
3634         return err;
3635 }
3636
3637 /**
3638  * ufshcd_eh_device_reset_handler - device reset handler registered to
3639  *                                    scsi layer.
3640  * @cmd: SCSI command pointer
3641  *
3642  * Returns SUCCESS/FAILED
3643  */
3644 static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
3645 {
3646         struct Scsi_Host *host;
3647         struct ufs_hba *hba;
3648         unsigned int tag;
3649         u32 pos;
3650         int err;
3651         u8 resp = 0xF;
3652         struct ufshcd_lrb *lrbp;
3653         unsigned long flags;
3654
3655         host = cmd->device->host;
3656         hba = shost_priv(host);
3657         tag = cmd->request->tag;
3658
3659         lrbp = &hba->lrb[tag];
3660         err = ufshcd_issue_tm_cmd(hba, lrbp->lun, 0, UFS_LOGICAL_RESET, &resp);
3661         if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
3662                 if (!err)
3663                         err = resp;
3664                 goto out;
3665         }
3666
3667         /* clear the commands that were pending for corresponding LUN */
3668         for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs) {
3669                 if (hba->lrb[pos].lun == lrbp->lun) {
3670                         err = ufshcd_clear_cmd(hba, pos);
3671                         if (err)
3672                                 break;
3673                 }
3674         }
3675         spin_lock_irqsave(host->host_lock, flags);
3676         ufshcd_transfer_req_compl(hba);
3677         spin_unlock_irqrestore(host->host_lock, flags);
3678 out:
3679         if (!err) {
3680                 err = SUCCESS;
3681         } else {
3682                 dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
3683                 err = FAILED;
3684         }
3685         return err;
3686 }
3687
3688 /**
3689  * ufshcd_abort - abort a specific command
3690  * @cmd: SCSI command pointer
3691  *
3692  * Abort the pending command in device by sending UFS_ABORT_TASK task management
3693  * command, and in host controller by clearing the door-bell register. There can
3694  * be race between controller sending the command to the device while abort is
3695  * issued. To avoid that, first issue UFS_QUERY_TASK to check if the command is
3696  * really issued and then try to abort it.
3697  *
3698  * Returns SUCCESS/FAILED
3699  */
3700 static int ufshcd_abort(struct scsi_cmnd *cmd)
3701 {
3702         struct Scsi_Host *host;
3703         struct ufs_hba *hba;
3704         unsigned long flags;
3705         unsigned int tag;
3706         int err = 0;
3707         int poll_cnt;
3708         u8 resp = 0xF;
3709         struct ufshcd_lrb *lrbp;
3710         u32 reg;
3711
3712         host = cmd->device->host;
3713         hba = shost_priv(host);
3714         tag = cmd->request->tag;
3715
3716         ufshcd_hold(hba, false);
3717         /* If command is already aborted/completed, return SUCCESS */
3718         if (!(test_bit(tag, &hba->outstanding_reqs)))
3719                 goto out;
3720
3721         reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
3722         if (!(reg & (1 << tag))) {
3723                 dev_err(hba->dev,
3724                 "%s: cmd was completed, but without a notifying intr, tag = %d",
3725                 __func__, tag);
3726         }
3727
3728         lrbp = &hba->lrb[tag];
3729         for (poll_cnt = 100; poll_cnt; poll_cnt--) {
3730                 err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
3731                                 UFS_QUERY_TASK, &resp);
3732                 if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) {
3733                         /* cmd pending in the device */
3734                         break;
3735                 } else if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
3736                         /*
3737                          * cmd not pending in the device, check if it is
3738                          * in transition.
3739                          */
3740                         reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
3741                         if (reg & (1 << tag)) {
3742                                 /* sleep for max. 200us to stabilize */
3743                                 usleep_range(100, 200);
3744                                 continue;
3745                         }
3746                         /* command completed already */
3747                         goto out;
3748                 } else {
3749                         if (!err)
3750                                 err = resp; /* service response error */
3751                         goto out;
3752                 }
3753         }
3754
3755         if (!poll_cnt) {
3756                 err = -EBUSY;
3757                 goto out;
3758         }
3759
3760         err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
3761                         UFS_ABORT_TASK, &resp);
3762         if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
3763                 if (!err)
3764                         err = resp; /* service response error */
3765                 goto out;
3766         }
3767
3768         err = ufshcd_clear_cmd(hba, tag);
3769         if (err)
3770                 goto out;
3771
3772         scsi_dma_unmap(cmd);
3773
3774         spin_lock_irqsave(host->host_lock, flags);
3775         __clear_bit(tag, &hba->outstanding_reqs);
3776         hba->lrb[tag].cmd = NULL;
3777         spin_unlock_irqrestore(host->host_lock, flags);
3778
3779         clear_bit_unlock(tag, &hba->lrb_in_use);
3780         wake_up(&hba->dev_cmd.tag_wq);
3781
3782 out:
3783         if (!err) {
3784                 err = SUCCESS;
3785         } else {
3786                 dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
3787                 err = FAILED;
3788         }
3789
3790         /*
3791          * This ufshcd_release() corresponds to the original scsi cmd that got
3792          * aborted here (as we won't get any IRQ for it).
3793          */
3794         ufshcd_release(hba);
3795         return err;
3796 }
3797
3798 /**
3799  * ufshcd_host_reset_and_restore - reset and restore host controller
3800  * @hba: per-adapter instance
3801  *
3802  * Note that host controller reset may issue DME_RESET to
3803  * local and remote (device) Uni-Pro stack and the attributes
3804  * are reset to default state.
3805  *
3806  * Returns zero on success, non-zero on failure
3807  */
3808 static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
3809 {
3810         int err;
3811         unsigned long flags;
3812
3813         /* Reset the host controller */
3814         spin_lock_irqsave(hba->host->host_lock, flags);
3815         ufshcd_hba_stop(hba);
3816         spin_unlock_irqrestore(hba->host->host_lock, flags);
3817
3818         err = ufshcd_hba_enable(hba);
3819         if (err)
3820                 goto out;
3821
3822         /* Establish the link again and restore the device */
3823         err = ufshcd_probe_hba(hba);
3824
3825         if (!err && (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL))
3826                 err = -EIO;
3827 out:
3828         if (err)
3829                 dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);
3830
3831         return err;
3832 }
3833
3834 /**
3835  * ufshcd_reset_and_restore - reset and re-initialize host/device
3836  * @hba: per-adapter instance
3837  *
3838  * Reset and recover device, host and re-establish link. This
3839  * is helpful to recover the communication in fatal error conditions.
3840  *
3841  * Returns zero on success, non-zero on failure
3842  */
3843 static int ufshcd_reset_and_restore(struct ufs_hba *hba)
3844 {
3845         int err = 0;
3846         unsigned long flags;
3847         int retries = MAX_HOST_RESET_RETRIES;
3848
3849         do {
3850                 err = ufshcd_host_reset_and_restore(hba);
3851         } while (err && --retries);
3852
3853         /*
3854          * After reset the door-bell might be cleared, complete
3855          * outstanding requests in s/w here.
3856          */
3857         spin_lock_irqsave(hba->host->host_lock, flags);
3858         ufshcd_transfer_req_compl(hba);
3859         ufshcd_tmc_handler(hba);
3860         spin_unlock_irqrestore(hba->host->host_lock, flags);
3861
3862         return err;
3863 }
3864
3865 /**
3866  * ufshcd_eh_host_reset_handler - host reset handler registered to scsi layer
3867  * @cmd - SCSI command pointer
3868  *
3869  * Returns SUCCESS/FAILED
3870  */
3871 static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
3872 {
3873         int err;
3874         unsigned long flags;
3875         struct ufs_hba *hba;
3876
3877         hba = shost_priv(cmd->device->host);
3878
3879         ufshcd_hold(hba, false);
3880         /*
3881          * Check if there is any race with fatal error handling.
3882          * If so, wait for it to complete. Even though fatal error
3883          * handling does reset and restore in some cases, don't assume
3884          * anything out of it. We are just avoiding race here.
3885          */
3886         do {
3887                 spin_lock_irqsave(hba->host->host_lock, flags);
3888                 if (!(work_pending(&hba->eh_work) ||
3889                                 hba->ufshcd_state == UFSHCD_STATE_RESET))
3890                         break;
3891                 spin_unlock_irqrestore(hba->host->host_lock, flags);
3892                 dev_dbg(hba->dev, "%s: reset in progress\n", __func__);
3893                 flush_work(&hba->eh_work);
3894         } while (1);
3895
3896         hba->ufshcd_state = UFSHCD_STATE_RESET;
3897         ufshcd_set_eh_in_progress(hba);
3898         spin_unlock_irqrestore(hba->host->host_lock, flags);
3899
3900         err = ufshcd_reset_and_restore(hba);
3901
3902         spin_lock_irqsave(hba->host->host_lock, flags);
3903         if (!err) {
3904                 err = SUCCESS;
3905                 hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
3906         } else {
3907                 err = FAILED;
3908                 hba->ufshcd_state = UFSHCD_STATE_ERROR;
3909         }
3910         ufshcd_clear_eh_in_progress(hba);
3911         spin_unlock_irqrestore(hba->host->host_lock, flags);
3912
3913         ufshcd_release(hba);
3914         return err;
3915 }
3916
3917 /**
3918  * ufshcd_get_max_icc_level - calculate the ICC level
3919  * @sup_curr_uA: max. current supported by the regulator
3920  * @start_scan: row at the desc table to start scan from
3921  * @buff: power descriptor buffer
3922  *
3923  * Returns calculated max ICC level for specific regulator
3924  */
3925 static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan, char *buff)
3926 {
3927         int i;
3928         int curr_uA;
3929         u16 data;
3930         u16 unit;
3931
3932         for (i = start_scan; i >= 0; i--) {
3933                 data = be16_to_cpu(*((u16 *)(buff + 2*i)));
3934                 unit = (data & ATTR_ICC_LVL_UNIT_MASK) >>
3935                                                 ATTR_ICC_LVL_UNIT_OFFSET;
3936                 curr_uA = data & ATTR_ICC_LVL_VALUE_MASK;
3937                 switch (unit) {
3938                 case UFSHCD_NANO_AMP:
3939                         curr_uA = curr_uA / 1000;
3940                         break;
3941                 case UFSHCD_MILI_AMP:
3942                         curr_uA = curr_uA * 1000;
3943                         break;
3944                 case UFSHCD_AMP:
3945                         curr_uA = curr_uA * 1000 * 1000;
3946                         break;
3947                 case UFSHCD_MICRO_AMP:
3948                 default:
3949                         break;
3950                 }
3951                 if (sup_curr_uA >= curr_uA)
3952                         break;
3953         }
3954         if (i < 0) {
3955                 i = 0;
3956                 pr_err("%s: Couldn't find valid icc_level = %d", __func__, i);
3957         }
3958
3959         return (u32)i;
3960 }
3961
3962 /**
3963  * ufshcd_calc_icc_level - calculate the max ICC level
3964  * In case regulators are not initialized we'll return 0
3965  * @hba: per-adapter instance
3966  * @desc_buf: power descriptor buffer to extract ICC levels from.
3967  * @len: length of desc_buff
3968  *
3969  * Returns calculated ICC level
3970  */
3971 static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
3972                                                         u8 *desc_buf, int len)
3973 {
3974         u32 icc_level = 0;
3975
3976         if (!hba->vreg_info.vcc || !hba->vreg_info.vccq ||
3977                                                 !hba->vreg_info.vccq2) {
3978                 dev_err(hba->dev,
3979                         "%s: Regulator capability was not set, actvIccLevel=%d",
3980                                                         __func__, icc_level);
3981                 goto out;
3982         }
3983
3984         if (hba->vreg_info.vcc)
3985                 icc_level = ufshcd_get_max_icc_level(
3986                                 hba->vreg_info.vcc->max_uA,
3987                                 POWER_DESC_MAX_ACTV_ICC_LVLS - 1,
3988                                 &desc_buf[PWR_DESC_ACTIVE_LVLS_VCC_0]);
3989
3990         if (hba->vreg_info.vccq)
3991                 icc_level = ufshcd_get_max_icc_level(
3992                                 hba->vreg_info.vccq->max_uA,
3993                                 icc_level,
3994                                 &desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ_0]);
3995
3996         if (hba->vreg_info.vccq2)
3997                 icc_level = ufshcd_get_max_icc_level(
3998                                 hba->vreg_info.vccq2->max_uA,
3999                                 icc_level,
4000                                 &desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ2_0]);
4001 out:
4002         return icc_level;
4003 }
4004
4005 static void ufshcd_init_icc_levels(struct ufs_hba *hba)
4006 {
4007         int ret;
4008         int buff_len = QUERY_DESC_POWER_MAX_SIZE;
4009         u8 desc_buf[QUERY_DESC_POWER_MAX_SIZE];
4010
4011         ret = ufshcd_read_power_desc(hba, desc_buf, buff_len);
4012         if (ret) {
4013                 dev_err(hba->dev,
4014                         "%s: Failed reading power descriptor.len = %d ret = %d",
4015                         __func__, buff_len, ret);
4016                 return;
4017         }
4018
4019         hba->init_prefetch_data.icc_level =
4020                         ufshcd_find_max_sup_active_icc_level(hba,
4021                         desc_buf, buff_len);
4022         dev_dbg(hba->dev, "%s: setting icc_level 0x%x",
4023                         __func__, hba->init_prefetch_data.icc_level);
4024
4025         ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
4026                         QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0,
4027                         &hba->init_prefetch_data.icc_level);
4028
4029         if (ret)
4030                 dev_err(hba->dev,
4031                         "%s: Failed configuring bActiveICCLevel = %d ret = %d",
4032                         __func__, hba->init_prefetch_data.icc_level , ret);
4033
4034 }
4035
4036 /**
4037  * ufshcd_scsi_add_wlus - Adds required W-LUs
4038  * @hba: per-adapter instance
4039  *
4040  * UFS device specification requires the UFS devices to support 4 well known
4041  * logical units:
4042  *      "REPORT_LUNS" (address: 01h)
4043  *      "UFS Device" (address: 50h)
4044  *      "RPMB" (address: 44h)
4045  *      "BOOT" (address: 30h)
4046  * UFS device's power management needs to be controlled by "POWER CONDITION"
4047  * field of SSU (START STOP UNIT) command. But this "power condition" field
4048  * will take effect only when its sent to "UFS device" well known logical unit
4049  * hence we require the scsi_device instance to represent this logical unit in
4050  * order for the UFS host driver to send the SSU command for power management.
4051
4052  * We also require the scsi_device instance for "RPMB" (Replay Protected Memory
4053  * Block) LU so user space process can control this LU. User space may also
4054  * want to have access to BOOT LU.
4055
4056  * This function adds scsi device instances for each of all well known LUs
4057  * (except "REPORT LUNS" LU).
4058  *
4059  * Returns zero on success (all required W-LUs are added successfully),
4060  * non-zero error value on failure (if failed to add any of the required W-LU).
4061  */
4062 static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
4063 {
4064         int ret = 0;
4065
4066         hba->sdev_ufs_device = __scsi_add_device(hba->host, 0, 0,
4067                 ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN), NULL);
4068         if (IS_ERR(hba->sdev_ufs_device)) {
4069                 ret = PTR_ERR(hba->sdev_ufs_device);
4070                 hba->sdev_ufs_device = NULL;
4071                 goto out;
4072         }
4073
4074         hba->sdev_boot = __scsi_add_device(hba->host, 0, 0,
4075                 ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
4076         if (IS_ERR(hba->sdev_boot)) {
4077                 ret = PTR_ERR(hba->sdev_boot);
4078                 hba->sdev_boot = NULL;
4079                 goto remove_sdev_ufs_device;
4080         }
4081
4082         hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
4083                 ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN), NULL);
4084         if (IS_ERR(hba->sdev_rpmb)) {
4085                 ret = PTR_ERR(hba->sdev_rpmb);
4086                 hba->sdev_rpmb = NULL;
4087                 goto remove_sdev_boot;
4088         }
4089         goto out;
4090
4091 remove_sdev_boot:
4092         scsi_remove_device(hba->sdev_boot);
4093 remove_sdev_ufs_device:
4094         scsi_remove_device(hba->sdev_ufs_device);
4095 out:
4096         return ret;
4097 }
4098
4099 /**
4100  * ufshcd_scsi_remove_wlus - Removes the W-LUs which were added by
4101  *                           ufshcd_scsi_add_wlus()
4102  * @hba: per-adapter instance
4103  *
4104  */
4105 static void ufshcd_scsi_remove_wlus(struct ufs_hba *hba)
4106 {
4107         if (hba->sdev_ufs_device) {
4108                 scsi_remove_device(hba->sdev_ufs_device);
4109                 hba->sdev_ufs_device = NULL;
4110         }
4111
4112         if (hba->sdev_boot) {
4113                 scsi_remove_device(hba->sdev_boot);
4114                 hba->sdev_boot = NULL;
4115         }
4116
4117         if (hba->sdev_rpmb) {
4118                 scsi_remove_device(hba->sdev_rpmb);
4119                 hba->sdev_rpmb = NULL;
4120         }
4121 }
4122
4123 /**
4124  * ufshcd_probe_hba - probe hba to detect device and initialize
4125  * @hba: per-adapter instance
4126  *
4127  * Execute link-startup and verify device initialization
4128  */
4129 static int ufshcd_probe_hba(struct ufs_hba *hba)
4130 {
4131         int ret;
4132
4133         ret = ufshcd_link_startup(hba);
4134         if (ret)
4135                 goto out;
4136
4137         /* UniPro link is active now */
4138         ufshcd_set_link_active(hba);
4139
4140         ret = ufshcd_verify_dev_init(hba);
4141         if (ret)
4142                 goto out;
4143
4144         ret = ufshcd_complete_dev_init(hba);
4145         if (ret)
4146                 goto out;
4147
4148         /* UFS device is also active now */
4149         ufshcd_set_ufs_dev_active(hba);
4150         ufshcd_force_reset_auto_bkops(hba);
4151         hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
4152         hba->wlun_dev_clr_ua = true;
4153
4154         if (ufshcd_get_max_pwr_mode(hba)) {
4155                 dev_err(hba->dev,
4156                         "%s: Failed getting max supported power mode\n",
4157                         __func__);
4158         } else {
4159                 ret = ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
4160                 if (ret)
4161                         dev_err(hba->dev, "%s: Failed setting power mode, err = %d\n",
4162                                         __func__, ret);
4163         }
4164
4165         /*
4166          * If we are in error handling context or in power management callbacks
4167          * context, no need to scan the host
4168          */
4169         if (!ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
4170                 bool flag;
4171
4172                 /* clear any previous UFS device information */
4173                 memset(&hba->dev_info, 0, sizeof(hba->dev_info));
4174                 if (!ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
4175                                        QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
4176                         hba->dev_info.f_power_on_wp_en = flag;
4177
4178                 if (!hba->is_init_prefetch)
4179                         ufshcd_init_icc_levels(hba);
4180
4181                 /* Add required well known logical units to scsi mid layer */
4182                 if (ufshcd_scsi_add_wlus(hba))
4183                         goto out;
4184
4185                 scsi_scan_host(hba->host);
4186                 pm_runtime_put_sync(hba->dev);
4187         }
4188
4189         if (!hba->is_init_prefetch)
4190                 hba->is_init_prefetch = true;
4191
4192         /* Resume devfreq after UFS device is detected */
4193         if (ufshcd_is_clkscaling_enabled(hba))
4194                 devfreq_resume_device(hba->devfreq);
4195
4196 out:
4197         /*
4198          * If we failed to initialize the device or the device is not
4199          * present, turn off the power/clocks etc.
4200          */
4201         if (ret && !ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
4202                 pm_runtime_put_sync(hba->dev);
4203                 ufshcd_hba_exit(hba);
4204         }
4205
4206         return ret;
4207 }
4208
4209 /**
4210  * ufshcd_async_scan - asynchronous execution for probing hba
4211  * @data: data pointer to pass to this function
4212  * @cookie: cookie data
4213  */
4214 static void ufshcd_async_scan(void *data, async_cookie_t cookie)
4215 {
4216         struct ufs_hba *hba = (struct ufs_hba *)data;
4217
4218         ufshcd_probe_hba(hba);
4219 }
4220
4221 static struct scsi_host_template ufshcd_driver_template = {
4222         .module                 = THIS_MODULE,
4223         .name                   = UFSHCD,
4224         .proc_name              = UFSHCD,
4225         .queuecommand           = ufshcd_queuecommand,
4226         .slave_alloc            = ufshcd_slave_alloc,
4227         .slave_configure        = ufshcd_slave_configure,
4228         .slave_destroy          = ufshcd_slave_destroy,
4229         .change_queue_depth     = ufshcd_change_queue_depth,
4230         .eh_abort_handler       = ufshcd_abort,
4231         .eh_device_reset_handler = ufshcd_eh_device_reset_handler,
4232         .eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
4233         .this_id                = -1,
4234         .sg_tablesize           = SG_ALL,
4235         .cmd_per_lun            = UFSHCD_CMD_PER_LUN,
4236         .can_queue              = UFSHCD_CAN_QUEUE,
4237         .max_host_blocked       = 1,
4238 };
4239
4240 static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
4241                                    int ua)
4242 {
4243         int ret = 0;
4244         struct regulator *reg = vreg->reg;
4245         const char *name = vreg->name;
4246
4247         BUG_ON(!vreg);
4248
4249         ret = regulator_set_optimum_mode(reg, ua);
4250         if (ret >= 0) {
4251                 /*
4252                  * regulator_set_optimum_mode() returns new regulator
4253                  * mode upon success.
4254                  */
4255                 ret = 0;
4256         } else {
4257                 dev_err(dev, "%s: %s set optimum mode(ua=%d) failed, err=%d\n",
4258                                 __func__, name, ua, ret);
4259         }
4260
4261         return ret;
4262 }
4263
4264 static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
4265                                          struct ufs_vreg *vreg)
4266 {
4267         return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
4268 }
4269
4270 static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
4271                                          struct ufs_vreg *vreg)
4272 {
4273         return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
4274 }
4275
4276 static int ufshcd_config_vreg(struct device *dev,
4277                 struct ufs_vreg *vreg, bool on)
4278 {
4279         int ret = 0;
4280         struct regulator *reg = vreg->reg;
4281         const char *name = vreg->name;
4282         int min_uV, uA_load;
4283
4284         BUG_ON(!vreg);
4285
4286         if (regulator_count_voltages(reg) > 0) {
4287                 min_uV = on ? vreg->min_uV : 0;
4288                 ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
4289                 if (ret) {
4290                         dev_err(dev, "%s: %s set voltage failed, err=%d\n",
4291                                         __func__, name, ret);
4292                         goto out;
4293                 }
4294
4295                 uA_load = on ? vreg->max_uA : 0;
4296                 ret = ufshcd_config_vreg_load(dev, vreg, uA_load);
4297                 if (ret)
4298                         goto out;
4299         }
4300 out:
4301         return ret;
4302 }
4303
4304 static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
4305 {
4306         int ret = 0;
4307
4308         if (!vreg || vreg->enabled)
4309                 goto out;
4310
4311         ret = ufshcd_config_vreg(dev, vreg, true);
4312         if (!ret)
4313                 ret = regulator_enable(vreg->reg);
4314
4315         if (!ret)
4316                 vreg->enabled = true;
4317         else
4318                 dev_err(dev, "%s: %s enable failed, err=%d\n",
4319                                 __func__, vreg->name, ret);
4320 out:
4321         return ret;
4322 }
4323
4324 static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
4325 {
4326         int ret = 0;
4327
4328         if (!vreg || !vreg->enabled)
4329                 goto out;
4330
4331         ret = regulator_disable(vreg->reg);
4332
4333         if (!ret) {
4334                 /* ignore errors on applying disable config */
4335                 ufshcd_config_vreg(dev, vreg, false);
4336                 vreg->enabled = false;
4337         } else {
4338                 dev_err(dev, "%s: %s disable failed, err=%d\n",
4339                                 __func__, vreg->name, ret);
4340         }
4341 out:
4342         return ret;
4343 }
4344
4345 static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
4346 {
4347         int ret = 0;
4348         struct device *dev = hba->dev;
4349         struct ufs_vreg_info *info = &hba->vreg_info;
4350
4351         if (!info)
4352                 goto out;
4353
4354         ret = ufshcd_toggle_vreg(dev, info->vcc, on);
4355         if (ret)
4356                 goto out;
4357
4358         ret = ufshcd_toggle_vreg(dev, info->vccq, on);
4359         if (ret)
4360                 goto out;
4361
4362         ret = ufshcd_toggle_vreg(dev, info->vccq2, on);
4363         if (ret)
4364                 goto out;
4365
4366 out:
4367         if (ret) {
4368                 ufshcd_toggle_vreg(dev, info->vccq2, false);
4369                 ufshcd_toggle_vreg(dev, info->vccq, false);
4370                 ufshcd_toggle_vreg(dev, info->vcc, false);
4371         }
4372         return ret;
4373 }
4374
4375 static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
4376 {
4377         struct ufs_vreg_info *info = &hba->vreg_info;
4378
4379         if (info)
4380                 return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);
4381
4382         return 0;
4383 }
4384
4385 static int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
4386 {
4387         int ret = 0;
4388
4389         if (!vreg)
4390                 goto out;
4391
4392         vreg->reg = devm_regulator_get(dev, vreg->name);
4393         if (IS_ERR(vreg->reg)) {
4394                 ret = PTR_ERR(vreg->reg);
4395                 dev_err(dev, "%s: %s get failed, err=%d\n",
4396                                 __func__, vreg->name, ret);
4397         }
4398 out:
4399         return ret;
4400 }
4401
4402 static int ufshcd_init_vreg(struct ufs_hba *hba)
4403 {
4404         int ret = 0;
4405         struct device *dev = hba->dev;
4406         struct ufs_vreg_info *info = &hba->vreg_info;
4407
4408         if (!info)
4409                 goto out;
4410
4411         ret = ufshcd_get_vreg(dev, info->vcc);
4412         if (ret)
4413                 goto out;
4414
4415         ret = ufshcd_get_vreg(dev, info->vccq);
4416         if (ret)
4417                 goto out;
4418
4419         ret = ufshcd_get_vreg(dev, info->vccq2);
4420 out:
4421         return ret;
4422 }
4423
4424 static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
4425 {
4426         struct ufs_vreg_info *info = &hba->vreg_info;
4427
4428         if (info)
4429                 return ufshcd_get_vreg(hba->dev, info->vdd_hba);
4430
4431         return 0;
4432 }
4433
4434 static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
4435                                         bool skip_ref_clk)
4436 {
4437         int ret = 0;
4438         struct ufs_clk_info *clki;
4439         struct list_head *head = &hba->clk_list_head;
4440         unsigned long flags;
4441
4442         if (!head || list_empty(head))
4443                 goto out;
4444
4445         list_for_each_entry(clki, head, list) {
4446                 if (!IS_ERR_OR_NULL(clki->clk)) {
4447                         if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
4448                                 continue;
4449
4450                         if (on && !clki->enabled) {
4451                                 ret = clk_prepare_enable(clki->clk);
4452                                 if (ret) {
4453                                         dev_err(hba->dev, "%s: %s prepare enable failed, %d\n",
4454                                                 __func__, clki->name, ret);
4455                                         goto out;
4456                                 }
4457                         } else if (!on && clki->enabled) {
4458                                 clk_disable_unprepare(clki->clk);
4459                         }
4460                         clki->enabled = on;
4461                         dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
4462                                         clki->name, on ? "en" : "dis");
4463                 }
4464         }
4465
4466         if (hba->vops && hba->vops->setup_clocks)
4467                 ret = hba->vops->setup_clocks(hba, on);
4468 out:
4469         if (ret) {
4470                 list_for_each_entry(clki, head, list) {
4471                         if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
4472                                 clk_disable_unprepare(clki->clk);
4473                 }
4474         } else if (!ret && on) {
4475                 spin_lock_irqsave(hba->host->host_lock, flags);
4476                 hba->clk_gating.state = CLKS_ON;
4477                 spin_unlock_irqrestore(hba->host->host_lock, flags);
4478         }
4479         return ret;
4480 }
4481
4482 static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
4483 {
4484         return  __ufshcd_setup_clocks(hba, on, false);
4485 }
4486
4487 static int ufshcd_init_clocks(struct ufs_hba *hba)
4488 {
4489         int ret = 0;
4490         struct ufs_clk_info *clki;
4491         struct device *dev = hba->dev;
4492         struct list_head *head = &hba->clk_list_head;
4493
4494         if (!head || list_empty(head))
4495                 goto out;
4496
4497         list_for_each_entry(clki, head, list) {
4498                 if (!clki->name)
4499                         continue;
4500
4501                 clki->clk = devm_clk_get(dev, clki->name);
4502                 if (IS_ERR(clki->clk)) {
4503                         ret = PTR_ERR(clki->clk);
4504                         dev_err(dev, "%s: %s clk get failed, %d\n",
4505                                         __func__, clki->name, ret);
4506                         goto out;
4507                 }
4508
4509                 if (clki->max_freq) {
4510                         ret = clk_set_rate(clki->clk, clki->max_freq);
4511                         if (ret) {
4512                                 dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
4513                                         __func__, clki->name,
4514                                         clki->max_freq, ret);
4515                                 goto out;
4516                         }
4517                         clki->curr_freq = clki->max_freq;
4518                 }
4519                 dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
4520                                 clki->name, clk_get_rate(clki->clk));
4521         }
4522 out:
4523         return ret;
4524 }
4525
4526 static int ufshcd_variant_hba_init(struct ufs_hba *hba)
4527 {
4528         int err = 0;
4529
4530         if (!hba->vops)
4531                 goto out;
4532
4533         if (hba->vops->init) {
4534                 err = hba->vops->init(hba);
4535                 if (err)
4536                         goto out;
4537         }
4538
4539         if (hba->vops->setup_regulators) {
4540                 err = hba->vops->setup_regulators(hba, true);
4541                 if (err)
4542                         goto out_exit;
4543         }
4544
4545         goto out;
4546
4547 out_exit:
4548         if (hba->vops->exit)
4549                 hba->vops->exit(hba);
4550 out:
4551         if (err)
4552                 dev_err(hba->dev, "%s: variant %s init failed err %d\n",
4553                         __func__, hba->vops ? hba->vops->name : "", err);
4554         return err;
4555 }
4556
4557 static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
4558 {
4559         if (!hba->vops)
4560                 return;
4561
4562         if (hba->vops->setup_clocks)
4563                 hba->vops->setup_clocks(hba, false);
4564
4565         if (hba->vops->setup_regulators)
4566                 hba->vops->setup_regulators(hba, false);
4567
4568         if (hba->vops->exit)
4569                 hba->vops->exit(hba);
4570 }
4571
4572 static int ufshcd_hba_init(struct ufs_hba *hba)
4573 {
4574         int err;
4575
4576         /*
4577          * Handle host controller power separately from the UFS device power
4578          * rails as it will help controlling the UFS host controller power
4579          * collapse easily which is different than UFS device power collapse.
4580          * Also, enable the host controller power before we go ahead with rest
4581          * of the initialization here.
4582          */
4583         err = ufshcd_init_hba_vreg(hba);
4584         if (err)
4585                 goto out;
4586
4587         err = ufshcd_setup_hba_vreg(hba, true);
4588         if (err)
4589                 goto out;
4590
4591         err = ufshcd_init_clocks(hba);
4592         if (err)
4593                 goto out_disable_hba_vreg;
4594
4595         err = ufshcd_setup_clocks(hba, true);
4596         if (err)
4597                 goto out_disable_hba_vreg;
4598
4599         err = ufshcd_init_vreg(hba);
4600         if (err)
4601                 goto out_disable_clks;
4602
4603         err = ufshcd_setup_vreg(hba, true);
4604         if (err)
4605                 goto out_disable_clks;
4606
4607         err = ufshcd_variant_hba_init(hba);
4608         if (err)
4609                 goto out_disable_vreg;
4610
4611         hba->is_powered = true;
4612         goto out;
4613
4614 out_disable_vreg:
4615         ufshcd_setup_vreg(hba, false);
4616 out_disable_clks:
4617         ufshcd_setup_clocks(hba, false);
4618 out_disable_hba_vreg:
4619         ufshcd_setup_hba_vreg(hba, false);
4620 out:
4621         return err;
4622 }
4623
4624 static void ufshcd_hba_exit(struct ufs_hba *hba)
4625 {
4626         if (hba->is_powered) {
4627                 ufshcd_variant_hba_exit(hba);
4628                 ufshcd_setup_vreg(hba, false);
4629                 ufshcd_setup_clocks(hba, false);
4630                 ufshcd_setup_hba_vreg(hba, false);
4631                 hba->is_powered = false;
4632         }
4633 }
4634
4635 static int
4636 ufshcd_send_request_sense(struct ufs_hba *hba, struct scsi_device *sdp)
4637 {
4638         unsigned char cmd[6] = {REQUEST_SENSE,
4639                                 0,
4640                                 0,
4641                                 0,
4642                                 SCSI_SENSE_BUFFERSIZE,
4643                                 0};
4644         char *buffer;
4645         int ret;
4646
4647         buffer = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
4648         if (!buffer) {
4649                 ret = -ENOMEM;
4650                 goto out;
4651         }
4652
4653         ret = scsi_execute_req_flags(sdp, cmd, DMA_FROM_DEVICE, buffer,
4654                                 SCSI_SENSE_BUFFERSIZE, NULL,
4655                                 msecs_to_jiffies(1000), 3, NULL, REQ_PM);
4656         if (ret)
4657                 pr_err("%s: failed with err %d\n", __func__, ret);
4658
4659         kfree(buffer);
4660 out:
4661         return ret;
4662 }
4663
4664 /**
4665  * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
4666  *                           power mode
4667  * @hba: per adapter instance
4668  * @pwr_mode: device power mode to set
4669  *
4670  * Returns 0 if requested power mode is set successfully
4671  * Returns non-zero if failed to set the requested power mode
4672  */
4673 static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
4674                                      enum ufs_dev_pwr_mode pwr_mode)
4675 {
4676         unsigned char cmd[6] = { START_STOP };
4677         struct scsi_sense_hdr sshdr;
4678         struct scsi_device *sdp = hba->sdev_ufs_device;
4679         int ret;
4680
4681         if (!sdp || !scsi_device_online(sdp))
4682                 return -ENODEV;
4683
4684         /*
4685          * If scsi commands fail, the scsi mid-layer schedules scsi error-
4686          * handling, which would wait for host to be resumed. Since we know
4687          * we are functional while we are here, skip host resume in error
4688          * handling context.
4689          */
4690         hba->host->eh_noresume = 1;
4691         if (hba->wlun_dev_clr_ua) {
4692                 ret = ufshcd_send_request_sense(hba, sdp);
4693                 if (ret)
4694                         goto out;
4695                 /* Unit attention condition is cleared now */
4696                 hba->wlun_dev_clr_ua = false;
4697         }
4698
4699         cmd[4] = pwr_mode << 4;
4700
4701         /*
4702          * Current function would be generally called from the power management
4703          * callbacks hence set the REQ_PM flag so that it doesn't resume the
4704          * already suspended childs.
4705          */
4706         ret = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
4707                                      START_STOP_TIMEOUT, 0, NULL, REQ_PM);
4708         if (ret) {
4709                 sdev_printk(KERN_WARNING, sdp,
4710                           "START_STOP failed for power mode: %d\n", pwr_mode);
4711                 scsi_show_result(ret);
4712                 if (driver_byte(ret) & DRIVER_SENSE) {
4713                         scsi_show_sense_hdr(&sshdr);
4714                         scsi_show_extd_sense(sshdr.asc, sshdr.ascq);
4715                 }
4716         }
4717
4718         if (!ret)
4719                 hba->curr_dev_pwr_mode = pwr_mode;
4720 out:
4721         hba->host->eh_noresume = 0;
4722         return ret;
4723 }
4724
4725 static int ufshcd_link_state_transition(struct ufs_hba *hba,
4726                                         enum uic_link_state req_link_state,
4727                                         int check_for_bkops)
4728 {
4729         int ret = 0;
4730
4731         if (req_link_state == hba->uic_link_state)
4732                 return 0;
4733
4734         if (req_link_state == UIC_LINK_HIBERN8_STATE) {
4735                 ret = ufshcd_uic_hibern8_enter(hba);
4736                 if (!ret)
4737                         ufshcd_set_link_hibern8(hba);
4738                 else
4739                         goto out;
4740         }
4741         /*
4742          * If autobkops is enabled, link can't be turned off because
4743          * turning off the link would also turn off the device.
4744          */
4745         else if ((req_link_state == UIC_LINK_OFF_STATE) &&
4746                    (!check_for_bkops || (check_for_bkops &&
4747                     !hba->auto_bkops_enabled))) {
4748                 /*
4749                  * Change controller state to "reset state" which
4750                  * should also put the link in off/reset state
4751                  */
4752                 ufshcd_hba_stop(hba);
4753                 /*
4754                  * TODO: Check if we need any delay to make sure that
4755                  * controller is reset
4756                  */
4757                 ufshcd_set_link_off(hba);
4758         }
4759
4760 out:
4761         return ret;
4762 }
4763
4764 static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
4765 {
4766         /*
4767          * If UFS device is either in UFS_Sleep turn off VCC rail to save some
4768          * power.
4769          *
4770          * If UFS device and link is in OFF state, all power supplies (VCC,
4771          * VCCQ, VCCQ2) can be turned off if power on write protect is not
4772          * required. If UFS link is inactive (Hibern8 or OFF state) and device
4773          * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode.
4774          *
4775          * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
4776          * in low power state which would save some power.
4777          */
4778         if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
4779             !hba->dev_info.is_lu_power_on_wp) {
4780                 ufshcd_setup_vreg(hba, false);
4781         } else if (!ufshcd_is_ufs_dev_active(hba)) {
4782                 ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
4783                 if (!ufshcd_is_link_active(hba)) {
4784                         ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
4785                         ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
4786                 }
4787         }
4788 }
4789
4790 static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
4791 {
4792         int ret = 0;
4793
4794         if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
4795             !hba->dev_info.is_lu_power_on_wp) {
4796                 ret = ufshcd_setup_vreg(hba, true);
4797         } else if (!ufshcd_is_ufs_dev_active(hba)) {
4798                 ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true);
4799                 if (!ret && !ufshcd_is_link_active(hba)) {
4800                         ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
4801                         if (ret)
4802                                 goto vcc_disable;
4803                         ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
4804                         if (ret)
4805                                 goto vccq_lpm;
4806                 }
4807         }
4808         goto out;
4809
4810 vccq_lpm:
4811         ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
4812 vcc_disable:
4813         ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
4814 out:
4815         return ret;
4816 }
4817
4818 static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
4819 {
4820         if (ufshcd_is_link_off(hba))
4821                 ufshcd_setup_hba_vreg(hba, false);
4822 }
4823
4824 static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
4825 {
4826         if (ufshcd_is_link_off(hba))
4827                 ufshcd_setup_hba_vreg(hba, true);
4828 }
4829
4830 /**
4831  * ufshcd_suspend - helper function for suspend operations
4832  * @hba: per adapter instance
4833  * @pm_op: desired low power operation type
4834  *
4835  * This function will try to put the UFS device and link into low power
4836  * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl"
4837  * (System PM level).
4838  *
4839  * If this function is called during shutdown, it will make sure that
4840  * both UFS device and UFS link is powered off.
4841  *
4842  * NOTE: UFS device & link must be active before we enter in this function.
4843  *
4844  * Returns 0 for success and non-zero for failure
4845  */
4846 static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
4847 {
4848         int ret = 0;
4849         enum ufs_pm_level pm_lvl;
4850         enum ufs_dev_pwr_mode req_dev_pwr_mode;
4851         enum uic_link_state req_link_state;
4852
4853         hba->pm_op_in_progress = 1;
4854         if (!ufshcd_is_shutdown_pm(pm_op)) {
4855                 pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
4856                          hba->rpm_lvl : hba->spm_lvl;
4857                 req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
4858                 req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
4859         } else {
4860                 req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
4861                 req_link_state = UIC_LINK_OFF_STATE;
4862         }
4863
4864         /*
4865          * If we can't transition into any of the low power modes
4866          * just gate the clocks.
4867          */
4868         ufshcd_hold(hba, false);
4869         hba->clk_gating.is_suspended = true;
4870
4871         if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
4872                         req_link_state == UIC_LINK_ACTIVE_STATE) {
4873                 goto disable_clks;
4874         }
4875
4876         if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
4877             (req_link_state == hba->uic_link_state))
4878                 goto out;
4879
4880         /* UFS device & link must be active before we enter in this function */
4881         if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
4882                 ret = -EINVAL;
4883                 goto out;
4884         }
4885
4886         if (ufshcd_is_runtime_pm(pm_op)) {
4887                 if (ufshcd_can_autobkops_during_suspend(hba)) {
4888                         /*
4889                          * The device is idle with no requests in the queue,
4890                          * allow background operations if bkops status shows
4891                          * that performance might be impacted.
4892                          */
4893                         ret = ufshcd_urgent_bkops(hba);
4894                         if (ret)
4895                                 goto enable_gating;
4896                 } else {
4897                         /* make sure that auto bkops is disabled */
4898                         ufshcd_disable_auto_bkops(hba);
4899                 }
4900         }
4901
4902         if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) &&
4903              ((ufshcd_is_runtime_pm(pm_op) && !hba->auto_bkops_enabled) ||
4904                !ufshcd_is_runtime_pm(pm_op))) {
4905                 /* ensure that bkops is disabled */
4906                 ufshcd_disable_auto_bkops(hba);
4907                 ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
4908                 if (ret)
4909                         goto enable_gating;
4910         }
4911
4912         ret = ufshcd_link_state_transition(hba, req_link_state, 1);
4913         if (ret)
4914                 goto set_dev_active;
4915
4916         ufshcd_vreg_set_lpm(hba);
4917
4918 disable_clks:
4919         /*
4920          * The clock scaling needs access to controller registers. Hence, Wait
4921          * for pending clock scaling work to be done before clocks are
4922          * turned off.
4923          */
4924         if (ufshcd_is_clkscaling_enabled(hba)) {
4925                 devfreq_suspend_device(hba->devfreq);
4926                 hba->clk_scaling.window_start_t = 0;
4927         }
4928         /*
4929          * Call vendor specific suspend callback. As these callbacks may access
4930          * vendor specific host controller register space call them before the
4931          * host clocks are ON.
4932          */
4933         if (hba->vops && hba->vops->suspend) {
4934                 ret = hba->vops->suspend(hba, pm_op);
4935                 if (ret)
4936                         goto set_link_active;
4937         }
4938
4939         if (hba->vops && hba->vops->setup_clocks) {
4940                 ret = hba->vops->setup_clocks(hba, false);
4941                 if (ret)
4942                         goto vops_resume;
4943         }
4944
4945         if (!ufshcd_is_link_active(hba))
4946                 ufshcd_setup_clocks(hba, false);
4947         else
4948                 /* If link is active, device ref_clk can't be switched off */
4949                 __ufshcd_setup_clocks(hba, false, true);
4950
4951         hba->clk_gating.state = CLKS_OFF;
4952         /*
4953          * Disable the host irq as host controller as there won't be any
4954          * host controller trasanction expected till resume.
4955          */
4956         ufshcd_disable_irq(hba);
4957         /* Put the host controller in low power mode if possible */
4958         ufshcd_hba_vreg_set_lpm(hba);
4959         goto out;
4960
4961 vops_resume:
4962         if (hba->vops && hba->vops->resume)
4963                 hba->vops->resume(hba, pm_op);
4964 set_link_active:
4965         ufshcd_vreg_set_hpm(hba);
4966         if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba))
4967                 ufshcd_set_link_active(hba);
4968         else if (ufshcd_is_link_off(hba))
4969                 ufshcd_host_reset_and_restore(hba);
4970 set_dev_active:
4971         if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
4972                 ufshcd_disable_auto_bkops(hba);
4973 enable_gating:
4974         hba->clk_gating.is_suspended = false;
4975         ufshcd_release(hba);
4976 out:
4977         hba->pm_op_in_progress = 0;
4978         return ret;
4979 }
4980
4981 /**
4982  * ufshcd_resume - helper function for resume operations
4983  * @hba: per adapter instance
4984  * @pm_op: runtime PM or system PM
4985  *
4986  * This function basically brings the UFS device, UniPro link and controller
4987  * to active state.
4988  *
4989  * Returns 0 for success and non-zero for failure
4990  */
4991 static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
4992 {
4993         int ret;
4994         enum uic_link_state old_link_state;
4995
4996         hba->pm_op_in_progress = 1;
4997         old_link_state = hba->uic_link_state;
4998
4999         ufshcd_hba_vreg_set_hpm(hba);
5000         /* Make sure clocks are enabled before accessing controller */
5001         ret = ufshcd_setup_clocks(hba, true);
5002         if (ret)
5003                 goto out;
5004
5005         /* enable the host irq as host controller would be active soon */
5006         ret = ufshcd_enable_irq(hba);
5007         if (ret)
5008                 goto disable_irq_and_vops_clks;
5009
5010         ret = ufshcd_vreg_set_hpm(hba);
5011         if (ret)
5012                 goto disable_irq_and_vops_clks;
5013
5014         /*
5015          * Call vendor specific resume callback. As these callbacks may access
5016          * vendor specific host controller register space call them when the
5017          * host clocks are ON.
5018          */
5019         if (hba->vops && hba->vops->resume) {
5020                 ret = hba->vops->resume(hba, pm_op);
5021                 if (ret)
5022                         goto disable_vreg;
5023         }
5024
5025         if (ufshcd_is_link_hibern8(hba)) {
5026                 ret = ufshcd_uic_hibern8_exit(hba);
5027                 if (!ret)
5028                         ufshcd_set_link_active(hba);
5029                 else
5030                         goto vendor_suspend;
5031         } else if (ufshcd_is_link_off(hba)) {
5032                 ret = ufshcd_host_reset_and_restore(hba);
5033                 /*
5034                  * ufshcd_host_reset_and_restore() should have already
5035                  * set the link state as active
5036                  */
5037                 if (ret || !ufshcd_is_link_active(hba))
5038                         goto vendor_suspend;
5039         }
5040
5041         if (!ufshcd_is_ufs_dev_active(hba)) {
5042                 ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
5043                 if (ret)
5044                         goto set_old_link_state;
5045         }
5046
5047         /*
5048          * If BKOPs operations are urgently needed at this moment then
5049          * keep auto-bkops enabled or else disable it.
5050          */
5051         ufshcd_urgent_bkops(hba);
5052         hba->clk_gating.is_suspended = false;
5053
5054         if (ufshcd_is_clkscaling_enabled(hba))
5055                 devfreq_resume_device(hba->devfreq);
5056
5057         /* Schedule clock gating in case of no access to UFS device yet */
5058         ufshcd_release(hba);
5059         goto out;
5060
5061 set_old_link_state:
5062         ufshcd_link_state_transition(hba, old_link_state, 0);
5063 vendor_suspend:
5064         if (hba->vops && hba->vops->suspend)
5065                 hba->vops->suspend(hba, pm_op);
5066 disable_vreg:
5067         ufshcd_vreg_set_lpm(hba);
5068 disable_irq_and_vops_clks:
5069         ufshcd_disable_irq(hba);
5070         ufshcd_setup_clocks(hba, false);
5071 out:
5072         hba->pm_op_in_progress = 0;
5073         return ret;
5074 }
5075
5076 /**
5077  * ufshcd_system_suspend - system suspend routine
5078  * @hba: per adapter instance
5079  * @pm_op: runtime PM or system PM
5080  *
5081  * Check the description of ufshcd_suspend() function for more details.
5082  *
5083  * Returns 0 for success and non-zero for failure
5084  */
5085 int ufshcd_system_suspend(struct ufs_hba *hba)
5086 {
5087         int ret = 0;
5088
5089         if (!hba || !hba->is_powered)
5090                 goto out;
5091
5092         if (pm_runtime_suspended(hba->dev)) {
5093                 if (hba->rpm_lvl == hba->spm_lvl)
5094                         /*
5095                          * There is possibility that device may still be in
5096                          * active state during the runtime suspend.
5097                          */
5098                         if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
5099                             hba->curr_dev_pwr_mode) && !hba->auto_bkops_enabled)
5100                                 goto out;
5101
5102                 /*
5103                  * UFS device and/or UFS link low power states during runtime
5104                  * suspend seems to be different than what is expected during
5105                  * system suspend. Hence runtime resume the devic & link and
5106                  * let the system suspend low power states to take effect.
5107                  * TODO: If resume takes longer time, we might have optimize
5108                  * it in future by not resuming everything if possible.
5109                  */
5110                 ret = ufshcd_runtime_resume(hba);
5111                 if (ret)
5112                         goto out;
5113         }
5114
5115         ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
5116 out:
5117         if (!ret)
5118                 hba->is_sys_suspended = true;
5119         return ret;
5120 }
5121 EXPORT_SYMBOL(ufshcd_system_suspend);
5122
5123 /**
5124  * ufshcd_system_resume - system resume routine
5125  * @hba: per adapter instance
5126  *
5127  * Returns 0 for success and non-zero for failure
5128  */
5129
5130 int ufshcd_system_resume(struct ufs_hba *hba)
5131 {
5132         if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev))
5133                 /*
5134                  * Let the runtime resume take care of resuming
5135                  * if runtime suspended.
5136                  */
5137                 return 0;
5138
5139         return ufshcd_resume(hba, UFS_SYSTEM_PM);
5140 }
5141 EXPORT_SYMBOL(ufshcd_system_resume);
5142
5143 /**
5144  * ufshcd_runtime_suspend - runtime suspend routine
5145  * @hba: per adapter instance
5146  *
5147  * Check the description of ufshcd_suspend() function for more details.
5148  *
5149  * Returns 0 for success and non-zero for failure
5150  */
5151 int ufshcd_runtime_suspend(struct ufs_hba *hba)
5152 {
5153         if (!hba || !hba->is_powered)
5154                 return 0;
5155
5156         return ufshcd_suspend(hba, UFS_RUNTIME_PM);
5157 }
5158 EXPORT_SYMBOL(ufshcd_runtime_suspend);
5159
5160 /**
5161  * ufshcd_runtime_resume - runtime resume routine
5162  * @hba: per adapter instance
5163  *
5164  * This function basically brings the UFS device, UniPro link and controller
5165  * to active state. Following operations are done in this function:
5166  *
5167  * 1. Turn on all the controller related clocks
5168  * 2. Bring the UniPro link out of Hibernate state
5169  * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
5170  *    to active state.
5171  * 4. If auto-bkops is enabled on the device, disable it.
5172  *
5173  * So following would be the possible power state after this function return
5174  * successfully:
5175  *      S1: UFS device in Active state with VCC rail ON
5176  *          UniPro link in Active state
5177  *          All the UFS/UniPro controller clocks are ON
5178  *
5179  * Returns 0 for success and non-zero for failure
5180  */
5181 int ufshcd_runtime_resume(struct ufs_hba *hba)
5182 {
5183         if (!hba || !hba->is_powered)
5184                 return 0;
5185         else
5186                 return ufshcd_resume(hba, UFS_RUNTIME_PM);
5187 }
5188 EXPORT_SYMBOL(ufshcd_runtime_resume);
5189
5190 int ufshcd_runtime_idle(struct ufs_hba *hba)
5191 {
5192         return 0;
5193 }
5194 EXPORT_SYMBOL(ufshcd_runtime_idle);
5195
5196 /**
5197  * ufshcd_shutdown - shutdown routine
5198  * @hba: per adapter instance
5199  *
5200  * This function would power off both UFS device and UFS link.
5201  *
5202  * Returns 0 always to allow force shutdown even in case of errors.
5203  */
5204 int ufshcd_shutdown(struct ufs_hba *hba)
5205 {
5206         int ret = 0;
5207
5208         if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
5209                 goto out;
5210
5211         if (pm_runtime_suspended(hba->dev)) {
5212                 ret = ufshcd_runtime_resume(hba);
5213                 if (ret)
5214                         goto out;
5215         }
5216
5217         ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
5218 out:
5219         if (ret)
5220                 dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
5221         /* allow force shutdown even in case of errors */
5222         return 0;
5223 }
5224 EXPORT_SYMBOL(ufshcd_shutdown);
5225
5226 /**
5227  * ufshcd_remove - de-allocate SCSI host and host memory space
5228  *              data structure memory
5229  * @hba - per adapter instance
5230  */
5231 void ufshcd_remove(struct ufs_hba *hba)
5232 {
5233         scsi_remove_host(hba->host);
5234         ufshcd_scsi_remove_wlus(hba);
5235         /* disable interrupts */
5236         ufshcd_disable_intr(hba, hba->intr_mask);
5237         ufshcd_hba_stop(hba);
5238
5239         scsi_host_put(hba->host);
5240
5241         ufshcd_exit_clk_gating(hba);
5242         if (ufshcd_is_clkscaling_enabled(hba))
5243                 devfreq_remove_device(hba->devfreq);
5244         ufshcd_hba_exit(hba);
5245 }
5246 EXPORT_SYMBOL_GPL(ufshcd_remove);
5247
5248 /**
5249  * ufshcd_set_dma_mask - Set dma mask based on the controller
5250  *                       addressing capability
5251  * @hba: per adapter instance
5252  *
5253  * Returns 0 for success, non-zero for failure
5254  */
5255 static int ufshcd_set_dma_mask(struct ufs_hba *hba)
5256 {
5257         if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
5258                 if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
5259                         return 0;
5260         }
5261         return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
5262 }
5263
5264 /**
5265  * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
5266  * @dev: pointer to device handle
5267  * @hba_handle: driver private handle
5268  * Returns 0 on success, non-zero value on failure
5269  */
5270 int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
5271 {
5272         struct Scsi_Host *host;
5273         struct ufs_hba *hba;
5274         int err = 0;
5275
5276         if (!dev) {
5277                 dev_err(dev,
5278                 "Invalid memory reference for dev is NULL\n");
5279                 err = -ENODEV;
5280                 goto out_error;
5281         }
5282
5283         host = scsi_host_alloc(&ufshcd_driver_template,
5284                                 sizeof(struct ufs_hba));
5285         if (!host) {
5286                 dev_err(dev, "scsi_host_alloc failed\n");
5287                 err = -ENOMEM;
5288                 goto out_error;
5289         }
5290         hba = shost_priv(host);
5291         hba->host = host;
5292         hba->dev = dev;
5293         *hba_handle = hba;
5294
5295 out_error:
5296         return err;
5297 }
5298 EXPORT_SYMBOL(ufshcd_alloc_host);
5299
5300 static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
5301 {
5302         int ret = 0;
5303         struct ufs_clk_info *clki;
5304         struct list_head *head = &hba->clk_list_head;
5305
5306         if (!head || list_empty(head))
5307                 goto out;
5308
5309         list_for_each_entry(clki, head, list) {
5310                 if (!IS_ERR_OR_NULL(clki->clk)) {
5311                         if (scale_up && clki->max_freq) {
5312                                 if (clki->curr_freq == clki->max_freq)
5313                                         continue;
5314                                 ret = clk_set_rate(clki->clk, clki->max_freq);
5315                                 if (ret) {
5316                                         dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
5317                                                 __func__, clki->name,
5318                                                 clki->max_freq, ret);
5319                                         break;
5320                                 }
5321                                 clki->curr_freq = clki->max_freq;
5322
5323                         } else if (!scale_up && clki->min_freq) {
5324                                 if (clki->curr_freq == clki->min_freq)
5325                                         continue;
5326                                 ret = clk_set_rate(clki->clk, clki->min_freq);
5327                                 if (ret) {
5328                                         dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
5329                                                 __func__, clki->name,
5330                                                 clki->min_freq, ret);
5331                                         break;
5332                                 }
5333                                 clki->curr_freq = clki->min_freq;
5334                         }
5335                 }
5336                 dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
5337                                 clki->name, clk_get_rate(clki->clk));
5338         }
5339         if (hba->vops->clk_scale_notify)
5340                 hba->vops->clk_scale_notify(hba);
5341 out:
5342         return ret;
5343 }
5344
5345 static int ufshcd_devfreq_target(struct device *dev,
5346                                 unsigned long *freq, u32 flags)
5347 {
5348         int err = 0;
5349         struct ufs_hba *hba = dev_get_drvdata(dev);
5350
5351         if (!ufshcd_is_clkscaling_enabled(hba))
5352                 return -EINVAL;
5353
5354         if (*freq == UINT_MAX)
5355                 err = ufshcd_scale_clks(hba, true);
5356         else if (*freq == 0)
5357                 err = ufshcd_scale_clks(hba, false);
5358
5359         return err;
5360 }
5361
5362 static int ufshcd_devfreq_get_dev_status(struct device *dev,
5363                 struct devfreq_dev_status *stat)
5364 {
5365         struct ufs_hba *hba = dev_get_drvdata(dev);
5366         struct ufs_clk_scaling *scaling = &hba->clk_scaling;
5367         unsigned long flags;
5368
5369         if (!ufshcd_is_clkscaling_enabled(hba))
5370                 return -EINVAL;
5371
5372         memset(stat, 0, sizeof(*stat));
5373
5374         spin_lock_irqsave(hba->host->host_lock, flags);
5375         if (!scaling->window_start_t)
5376                 goto start_window;
5377
5378         if (scaling->is_busy_started)
5379                 scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
5380                                         scaling->busy_start_t));
5381
5382         stat->total_time = jiffies_to_usecs((long)jiffies -
5383                                 (long)scaling->window_start_t);
5384         stat->busy_time = scaling->tot_busy_t;
5385 start_window:
5386         scaling->window_start_t = jiffies;
5387         scaling->tot_busy_t = 0;
5388
5389         if (hba->outstanding_reqs) {
5390                 scaling->busy_start_t = ktime_get();
5391                 scaling->is_busy_started = true;
5392         } else {
5393                 scaling->busy_start_t = ktime_set(0, 0);
5394                 scaling->is_busy_started = false;
5395         }
5396         spin_unlock_irqrestore(hba->host->host_lock, flags);
5397         return 0;
5398 }
5399
5400 static struct devfreq_dev_profile ufs_devfreq_profile = {
5401         .polling_ms     = 100,
5402         .target         = ufshcd_devfreq_target,
5403         .get_dev_status = ufshcd_devfreq_get_dev_status,
5404 };
5405
5406 /**
5407  * ufshcd_init - Driver initialization routine
5408  * @hba: per-adapter instance
5409  * @mmio_base: base register address
5410  * @irq: Interrupt line of device
5411  * Returns 0 on success, non-zero value on failure
5412  */
5413 int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
5414 {
5415         int err;
5416         struct Scsi_Host *host = hba->host;
5417         struct device *dev = hba->dev;
5418
5419         if (!mmio_base) {
5420                 dev_err(hba->dev,
5421                 "Invalid memory reference for mmio_base is NULL\n");
5422                 err = -ENODEV;
5423                 goto out_error;
5424         }
5425
5426         hba->mmio_base = mmio_base;
5427         hba->irq = irq;
5428
5429         err = ufshcd_hba_init(hba);
5430         if (err)
5431                 goto out_error;
5432
5433         /* Read capabilities registers */
5434         ufshcd_hba_capabilities(hba);
5435
5436         /* Get UFS version supported by the controller */
5437         hba->ufs_version = ufshcd_get_ufs_version(hba);
5438
5439         /* Get Interrupt bit mask per version */
5440         hba->intr_mask = ufshcd_get_intr_mask(hba);
5441
5442         err = ufshcd_set_dma_mask(hba);
5443         if (err) {
5444                 dev_err(hba->dev, "set dma mask failed\n");
5445                 goto out_disable;
5446         }
5447
5448         /* Allocate memory for host memory space */
5449         err = ufshcd_memory_alloc(hba);
5450         if (err) {
5451                 dev_err(hba->dev, "Memory allocation failed\n");
5452                 goto out_disable;
5453         }
5454
5455         /* Configure LRB */
5456         ufshcd_host_memory_configure(hba);
5457
5458         host->can_queue = hba->nutrs;
5459         host->cmd_per_lun = hba->nutrs;
5460         host->max_id = UFSHCD_MAX_ID;
5461         host->max_lun = UFS_MAX_LUNS;
5462         host->max_channel = UFSHCD_MAX_CHANNEL;
5463         host->unique_id = host->host_no;
5464         host->max_cmd_len = MAX_CDB_SIZE;
5465
5466         hba->max_pwr_info.is_valid = false;
5467
5468         /* Initailize wait queue for task management */
5469         init_waitqueue_head(&hba->tm_wq);
5470         init_waitqueue_head(&hba->tm_tag_wq);
5471
5472         /* Initialize work queues */
5473         INIT_WORK(&hba->eh_work, ufshcd_err_handler);
5474         INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
5475
5476         /* Initialize UIC command mutex */
5477         mutex_init(&hba->uic_cmd_mutex);
5478
5479         /* Initialize mutex for device management commands */
5480         mutex_init(&hba->dev_cmd.lock);
5481
5482         /* Initialize device management tag acquire wait queue */
5483         init_waitqueue_head(&hba->dev_cmd.tag_wq);
5484
5485         ufshcd_init_clk_gating(hba);
5486         /* IRQ registration */
5487         err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
5488         if (err) {
5489                 dev_err(hba->dev, "request irq failed\n");
5490                 goto exit_gating;
5491         } else {
5492                 hba->is_irq_enabled = true;
5493         }
5494
5495         /* Enable SCSI tag mapping */
5496         err = scsi_init_shared_tag_map(host, host->can_queue);
5497         if (err) {
5498                 dev_err(hba->dev, "init shared queue failed\n");
5499                 goto exit_gating;
5500         }
5501
5502         err = scsi_add_host(host, hba->dev);
5503         if (err) {
5504                 dev_err(hba->dev, "scsi_add_host failed\n");
5505                 goto exit_gating;
5506         }
5507
5508         /* Host controller enable */
5509         err = ufshcd_hba_enable(hba);
5510         if (err) {
5511                 dev_err(hba->dev, "Host controller enable failed\n");
5512                 goto out_remove_scsi_host;
5513         }
5514
5515         if (ufshcd_is_clkscaling_enabled(hba)) {
5516                 hba->devfreq = devfreq_add_device(dev, &ufs_devfreq_profile,
5517                                                    "simple_ondemand", NULL);
5518                 if (IS_ERR(hba->devfreq)) {
5519                         dev_err(hba->dev, "Unable to register with devfreq %ld\n",
5520                                         PTR_ERR(hba->devfreq));
5521                         goto out_remove_scsi_host;
5522                 }
5523                 /* Suspend devfreq until the UFS device is detected */
5524                 devfreq_suspend_device(hba->devfreq);
5525                 hba->clk_scaling.window_start_t = 0;
5526         }
5527
5528         /* Hold auto suspend until async scan completes */
5529         pm_runtime_get_sync(dev);
5530
5531         /*
5532          * The device-initialize-sequence hasn't been invoked yet.
5533          * Set the device to power-off state
5534          */
5535         ufshcd_set_ufs_dev_poweroff(hba);
5536
5537         async_schedule(ufshcd_async_scan, hba);
5538
5539         return 0;
5540
5541 out_remove_scsi_host:
5542         scsi_remove_host(hba->host);
5543 exit_gating:
5544         ufshcd_exit_clk_gating(hba);
5545 out_disable:
5546         hba->is_irq_enabled = false;
5547         scsi_host_put(host);
5548         ufshcd_hba_exit(hba);
5549 out_error:
5550         return err;
5551 }
5552 EXPORT_SYMBOL_GPL(ufshcd_init);
5553
5554 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
5555 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
5556 MODULE_DESCRIPTION("Generic UFS host controller driver Core");
5557 MODULE_LICENSE("GPL");
5558 MODULE_VERSION(UFSHCD_DRIVER_VERSION);