drivers/net/wireless/iwlwifi/pcie/trans.c

   1 /******************************************************************************
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   6  * GPL LICENSE SUMMARY
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  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63 #include <linux/pci.h>
  64 #include <linux/pci-aspm.h>
  65 #include <linux/interrupt.h>
  66 #include <linux/debugfs.h>
  67 #include <linux/sched.h>
  68 #include <linux/bitops.h>
  69 #include <linux/gfp.h>
  70
  71 #include "iwl-drv.h"
  72 #include "iwl-trans.h"
  73 #include "iwl-csr.h"
  74 #include "iwl-prph.h"
  75 #include "iwl-agn-hw.h"
  76 #include "internal.h"
  77
  78 static void __iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans,
  79                                                   u32 reg, u32 mask, u32 value)
  80 {
  81         u32 v;
  82
  83 #ifdef CONFIG_IWLWIFI_DEBUG
  84         WARN_ON_ONCE(value & ~mask);
  85 #endif
  86
  87         v = iwl_read32(trans, reg);
  88         v &= ~mask;
  89         v |= value;
  90         iwl_write32(trans, reg, v);
  91 }
  92
  93 static inline void __iwl_trans_pcie_clear_bit(struct iwl_trans *trans,
  94                                               u32 reg, u32 mask)
  95 {
  96         __iwl_trans_pcie_set_bits_mask(trans, reg, mask, 0);
  97 }
  98
  99 static inline void __iwl_trans_pcie_set_bit(struct iwl_trans *trans,
 100                                             u32 reg, u32 mask)
 101 {
 102         __iwl_trans_pcie_set_bits_mask(trans, reg, mask, mask);
 103 }
 104
 105 static void iwl_pcie_set_pwr(struct iwl_trans *trans, bool vaux)
 106 {
 107         if (vaux && pci_pme_capable(to_pci_dev(trans->dev), PCI_D3cold))
 108                 iwl_set_bits_mask_prph(trans, APMG_PS_CTRL_REG,
 109                                        APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
 110                                        ~APMG_PS_CTRL_MSK_PWR_SRC);
 111         else
 112                 iwl_set_bits_mask_prph(trans, APMG_PS_CTRL_REG,
 113                                        APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
 114                                        ~APMG_PS_CTRL_MSK_PWR_SRC);
 115 }
 116
 117 /* PCI registers */
 118 #define PCI_CFG_RETRY_TIMEOUT   0x041
 119
 120 static void iwl_pcie_apm_config(struct iwl_trans *trans)
 121 {
 122         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 123         u16 lctl;
 124
 125         /*
 126          * HW bug W/A for instability in PCIe bus L0S->L1 transition.
 127          * Check if BIOS (or OS) enabled L1-ASPM on this device.
 128          * If so (likely), disable L0S, so device moves directly L0->L1;
 129          *    costs negligible amount of power savings.
 130          * If not (unlikely), enable L0S, so there is at least some
 131          *    power savings, even without L1.
 132          */
 133         pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_LNKCTL, &lctl);
 134         if (lctl & PCI_EXP_LNKCTL_ASPM_L1) {
 135                 /* L1-ASPM enabled; disable(!) L0S */
 136                 iwl_set_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
 137                 dev_info(trans->dev, "L1 Enabled; Disabling L0S\n");
 138         } else {
 139                 /* L1-ASPM disabled; enable(!) L0S */
 140                 iwl_clear_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
 141                 dev_info(trans->dev, "L1 Disabled; Enabling L0S\n");
 142         }
 143         trans->pm_support = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
 144 }
 145
 146 /*
 147  * Start up NIC's basic functionality after it has been reset
 148  * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop())
 149  * NOTE:  This does not load uCode nor start the embedded processor
 150  */
 151 static int iwl_pcie_apm_init(struct iwl_trans *trans)
 152 {
 153         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 154         int ret = 0;
 155         IWL_DEBUG_INFO(trans, "Init card's basic functions\n");
 156
 157         /*
 158          * Use "set_bit" below rather than "write", to preserve any hardware
 159          * bits already set by default after reset.
 160          */
 161
 162         /* Disable L0S exit timer (platform NMI Work/Around) */
 163         iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
 164                     CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
 165
 166         /*
 167          * Disable L0s without affecting L1;
 168          *  don't wait for ICH L0s (ICH bug W/A)
 169          */
 170         iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
 171                     CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
 172
 173         /* Set FH wait threshold to maximum (HW error during stress W/A) */
 174         iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
 175
 176         /*
 177          * Enable HAP INTA (interrupt from management bus) to
 178          * wake device's PCI Express link L1a -> L0s
 179          */
 180         iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
 181                     CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
 182
 183         iwl_pcie_apm_config(trans);
 184
 185         /* Configure analog phase-lock-loop before activating to D0A */
 186         if (trans->cfg->base_params->pll_cfg_val)
 187                 iwl_set_bit(trans, CSR_ANA_PLL_CFG,
 188                             trans->cfg->base_params->pll_cfg_val);
 189
 190         /*
 191          * Set "initialization complete" bit to move adapter from
 192          * D0U* --> D0A* (powered-up active) state.
 193          */
 194         iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 195
 196         /*
 197          * Wait for clock stabilization; once stabilized, access to
 198          * device-internal resources is supported, e.g. iwl_write_prph()
 199          * and accesses to uCode SRAM.
 200          */
 201         ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
 202                            CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 203                            CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
 204         if (ret < 0) {
 205                 IWL_DEBUG_INFO(trans, "Failed to init the card\n");
 206                 goto out;
 207         }
 208
 209         /*
 210          * Enable DMA clock and wait for it to stabilize.
 211          *
 212          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
 213          * do not disable clocks.  This preserves any hardware bits already
 214          * set by default in "CLK_CTRL_REG" after reset.
 215          */
 216         iwl_write_prph(trans, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
 217         udelay(20);
 218
 219         /* Disable L1-Active */
 220         iwl_set_bits_prph(trans, APMG_PCIDEV_STT_REG,
 221                           APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 222
 223         set_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);
 224
 225 out:
 226         return ret;
 227 }
 228
 229 static int iwl_pcie_apm_stop_master(struct iwl_trans *trans)
 230 {
 231         int ret = 0;
 232
 233         /* stop device's busmaster DMA activity */
 234         iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 235
 236         ret = iwl_poll_bit(trans, CSR_RESET,
 237                            CSR_RESET_REG_FLAG_MASTER_DISABLED,
 238                            CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
 239         if (ret)
 240                 IWL_WARN(trans, "Master Disable Timed Out, 100 usec\n");
 241
 242         IWL_DEBUG_INFO(trans, "stop master\n");
 243
 244         return ret;
 245 }
 246
 247 static void iwl_pcie_apm_stop(struct iwl_trans *trans)
 248 {
 249         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 250         IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n");
 251
 252         clear_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);
 253
 254         /* Stop device's DMA activity */
 255         iwl_pcie_apm_stop_master(trans);
 256
 257         /* Reset the entire device */
 258         iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 259
 260         udelay(10);
 261
 262         /*
 263          * Clear "initialization complete" bit to move adapter from
 264          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
 265          */
 266         iwl_clear_bit(trans, CSR_GP_CNTRL,
 267                       CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 268 }
 269
 270 static int iwl_pcie_nic_init(struct iwl_trans *trans)
 271 {
 272         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 273         unsigned long flags;
 274
 275         /* nic_init */
 276         spin_lock_irqsave(&trans_pcie->irq_lock, flags);
 277         iwl_pcie_apm_init(trans);
 278
 279         /* Set interrupt coalescing calibration timer to default (512 usecs) */
 280         iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
 281
 282         spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 283
 284         iwl_pcie_set_pwr(trans, false);
 285
 286         iwl_op_mode_nic_config(trans->op_mode);
 287
 288         /* Allocate the RX queue, or reset if it is already allocated */
 289         iwl_pcie_rx_init(trans);
 290
 291         /* Allocate or reset and init all Tx and Command queues */
 292         if (iwl_pcie_tx_init(trans))
 293                 return -ENOMEM;
 294
 295         if (trans->cfg->base_params->shadow_reg_enable) {
 296                 /* enable shadow regs in HW */
 297                 iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF);
 298                 IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n");
 299         }
 300
 301         return 0;
 302 }
 303
 304 #define HW_READY_TIMEOUT (50)
 305
 306 /* Note: returns poll_bit return value, which is >= 0 if success */
 307 static int iwl_pcie_set_hw_ready(struct iwl_trans *trans)
 308 {
 309         int ret;
 310
 311         iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
 312                     CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);
 313
 314         /* See if we got it */
 315         ret = iwl_poll_bit(trans, CSR_HW_IF_CONFIG_REG,
 316                            CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
 317                            CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
 318                            HW_READY_TIMEOUT);
 319
 320         IWL_DEBUG_INFO(trans, "hardware%s ready\n", ret < 0 ? " not" : "");
 321         return ret;
 322 }
 323
 324 /* Note: returns standard 0/-ERROR code */
 325 static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
 326 {
 327         int ret;
 328         int t = 0;
 329
 330         IWL_DEBUG_INFO(trans, "iwl_trans_prepare_card_hw enter\n");
 331
 332         ret = iwl_pcie_set_hw_ready(trans);
 333         /* If the card is ready, exit 0 */
 334         if (ret >= 0)
 335                 return 0;
 336
 337         /* If HW is not ready, prepare the conditions to check again */
 338         iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
 339                     CSR_HW_IF_CONFIG_REG_PREPARE);
 340
 341         do {
 342                 ret = iwl_pcie_set_hw_ready(trans);
 343                 if (ret >= 0)
 344                         return 0;
 345
 346                 usleep_range(200, 1000);
 347                 t += 200;
 348         } while (t < 150000);
 349
 350         return ret;
 351 }
 352
 353 /*
 354  * ucode
 355  */
 356 static int iwl_pcie_load_firmware_chunk(struct iwl_trans *trans, u32 dst_addr,
 357                                    dma_addr_t phy_addr, u32 byte_cnt)
 358 {
 359         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 360         int ret;
 361
 362         trans_pcie->ucode_write_complete = false;
 363
 364         iwl_write_direct32(trans,
 365                            FH_TCSR_CHNL_TX_CONFIG_REG(FH_SRVC_CHNL),
 366                            FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_PAUSE);
 367
 368         iwl_write_direct32(trans,
 369                            FH_SRVC_CHNL_SRAM_ADDR_REG(FH_SRVC_CHNL),
 370                            dst_addr);
 371
 372         iwl_write_direct32(trans,
 373                            FH_TFDIB_CTRL0_REG(FH_SRVC_CHNL),
 374                            phy_addr & FH_MEM_TFDIB_DRAM_ADDR_LSB_MSK);
 375
 376         iwl_write_direct32(trans,
 377                            FH_TFDIB_CTRL1_REG(FH_SRVC_CHNL),
 378                            (iwl_get_dma_hi_addr(phy_addr)
 379                                 << FH_MEM_TFDIB_REG1_ADDR_BITSHIFT) | byte_cnt);
 380
 381         iwl_write_direct32(trans,
 382                            FH_TCSR_CHNL_TX_BUF_STS_REG(FH_SRVC_CHNL),
 383                            1 << FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_NUM |
 384                            1 << FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_IDX |
 385                            FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_VALID);
 386
 387         iwl_write_direct32(trans,
 388                            FH_TCSR_CHNL_TX_CONFIG_REG(FH_SRVC_CHNL),
 389                            FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE    |
 390                            FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_DISABLE |
 391                            FH_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_ENDTFD);
 392
 393         ret = wait_event_timeout(trans_pcie->ucode_write_waitq,
 394                                  trans_pcie->ucode_write_complete, 5 * HZ);
 395         if (!ret) {
 396                 IWL_ERR(trans, "Failed to load firmware chunk!\n");
 397                 return -ETIMEDOUT;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int iwl_pcie_load_section(struct iwl_trans *trans, u8 section_num,
 404                             const struct fw_desc *section)
 405 {
 406         u8 *v_addr;
 407         dma_addr_t p_addr;
 408         u32 offset, chunk_sz = section->len;
 409         int ret = 0;
 410
 411         IWL_DEBUG_FW(trans, "[%d] uCode section being loaded...\n",
 412                      section_num);
 413
 414         v_addr = dma_alloc_coherent(trans->dev, chunk_sz, &p_addr,
 415                                     GFP_KERNEL | __GFP_NOWARN);
 416         if (!v_addr) {
 417                 IWL_DEBUG_INFO(trans, "Falling back to small chunks of DMA\n");
 418                 chunk_sz = PAGE_SIZE;
 419                 v_addr = dma_alloc_coherent(trans->dev, chunk_sz,
 420                                             &p_addr, GFP_KERNEL);
 421                 if (!v_addr)
 422                         return -ENOMEM;
 423         }
 424
 425         for (offset = 0; offset < section->len; offset += chunk_sz) {
 426                 u32 copy_size;
 427
 428                 copy_size = min_t(u32, chunk_sz, section->len - offset);
 429
 430                 memcpy(v_addr, (u8 *)section->data + offset, copy_size);
 431                 ret = iwl_pcie_load_firmware_chunk(trans,
 432                                                    section->offset + offset,
 433                                                    p_addr, copy_size);
 434                 if (ret) {
 435                         IWL_ERR(trans,
 436                                 "Could not load the [%d] uCode section\n",
 437                                 section_num);
 438                         break;
 439                 }
 440         }
 441
 442         dma_free_coherent(trans->dev, chunk_sz, v_addr, p_addr);
 443         return ret;
 444 }
 445
 446 static int iwl_pcie_load_given_ucode(struct iwl_trans *trans,
 447                                 const struct fw_img *image)
 448 {
 449         int i, ret = 0;
 450
 451         for (i = 0; i < IWL_UCODE_SECTION_MAX; i++) {
 452                 if (!image->sec[i].data)
 453                         break;
 454
 455                 ret = iwl_pcie_load_section(trans, i, &image->sec[i]);
 456                 if (ret)
 457                         return ret;
 458         }
 459
 460         /* Remove all resets to allow NIC to operate */
 461         iwl_write32(trans, CSR_RESET, 0);
 462
 463         return 0;
 464 }
 465
 466 static int iwl_trans_pcie_start_fw(struct iwl_trans *trans,
 467                                    const struct fw_img *fw, bool run_in_rfkill)
 468 {
 469         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 470         int ret;
 471         bool hw_rfkill;
 472
 473         /* This may fail if AMT took ownership of the device */
 474         if (iwl_pcie_prepare_card_hw(trans)) {
 475                 IWL_WARN(trans, "Exit HW not ready\n");
 476                 return -EIO;
 477         }
 478
 479         clear_bit(STATUS_FW_ERROR, &trans_pcie->status);
 480
 481         iwl_enable_rfkill_int(trans);
 482
 483         /* If platform's RF_KILL switch is NOT set to KILL */
 484         hw_rfkill = iwl_is_rfkill_set(trans);
 485         if (hw_rfkill)
 486                 set_bit(STATUS_RFKILL, &trans_pcie->status);
 487         else
 488                 clear_bit(STATUS_RFKILL, &trans_pcie->status);
 489         iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
 490         if (hw_rfkill && !run_in_rfkill)
 491                 return -ERFKILL;
 492
 493         iwl_write32(trans, CSR_INT, 0xFFFFFFFF);
 494
 495         ret = iwl_pcie_nic_init(trans);
 496         if (ret) {
 497                 IWL_ERR(trans, "Unable to init nic\n");
 498                 return ret;
 499         }
 500
 501         /* make sure rfkill handshake bits are cleared */
 502         iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
 503         iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR,
 504                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 505
 506         /* clear (again), then enable host interrupts */
 507         iwl_write32(trans, CSR_INT, 0xFFFFFFFF);
 508         iwl_enable_interrupts(trans);
 509
 510         /* really make sure rfkill handshake bits are cleared */
 511         iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
 512         iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
 513
 514         /* Load the given image to the HW */
 515         return iwl_pcie_load_given_ucode(trans, fw);
 516 }
 517
 518 static void iwl_trans_pcie_fw_alive(struct iwl_trans *trans, u32 scd_addr)
 519 {
 520         iwl_pcie_reset_ict(trans);
 521         iwl_pcie_tx_start(trans, scd_addr);
 522 }
 523
 524 static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
 525 {
 526         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 527         unsigned long flags;
 528
 529         /* tell the device to stop sending interrupts */
 530         spin_lock_irqsave(&trans_pcie->irq_lock, flags);
 531         iwl_disable_interrupts(trans);
 532         spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 533
 534         /* device going down, Stop using ICT table */
 535         iwl_pcie_disable_ict(trans);
 536
 537         /*
 538          * If a HW restart happens during firmware loading,
 539          * then the firmware loading might call this function
 540          * and later it might be called again due to the
 541          * restart. So don't process again if the device is
 542          * already dead.
 543          */
 544         if (test_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status)) {
 545                 iwl_pcie_tx_stop(trans);
 546                 iwl_pcie_rx_stop(trans);
 547
 548                 /* Power-down device's busmaster DMA clocks */
 549                 iwl_write_prph(trans, APMG_CLK_DIS_REG,
 550                                APMG_CLK_VAL_DMA_CLK_RQT);
 551                 udelay(5);
 552         }
 553
 554         /* Make sure (redundant) we've released our request to stay awake */
 555         iwl_clear_bit(trans, CSR_GP_CNTRL,
 556                       CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 557
 558         /* Stop the device, and put it in low power state */
 559         iwl_pcie_apm_stop(trans);
 560
 561         /* Upon stop, the APM issues an interrupt if HW RF kill is set.
 562          * Clean again the interrupt here
 563          */
 564         spin_lock_irqsave(&trans_pcie->irq_lock, flags);
 565         iwl_disable_interrupts(trans);
 566         spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 567
 568         iwl_enable_rfkill_int(trans);
 569
 570         /* stop and reset the on-board processor */
 571         iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
 572
 573         /* clear all status bits */
 574         clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status);
 575         clear_bit(STATUS_INT_ENABLED, &trans_pcie->status);
 576         clear_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);
 577         clear_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
 578         clear_bit(STATUS_RFKILL, &trans_pcie->status);
 579 }
 580
 581 static void iwl_trans_pcie_d3_suspend(struct iwl_trans *trans, bool test)
 582 {
 583         iwl_disable_interrupts(trans);
 584
 585         /*
 586          * in testing mode, the host stays awake and the
 587          * hardware won't be reset (not even partially)
 588          */
 589         if (test)
 590                 return;
 591
 592         iwl_pcie_disable_ict(trans);
 593
 594         iwl_clear_bit(trans, CSR_GP_CNTRL,
 595                       CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 596         iwl_clear_bit(trans, CSR_GP_CNTRL,
 597                       CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 598
 599         /*
 600          * reset TX queues -- some of their registers reset during S3
 601          * so if we don't reset everything here the D3 image would try
 602          * to execute some invalid memory upon resume
 603          */
 604         iwl_trans_pcie_tx_reset(trans);
 605
 606         iwl_pcie_set_pwr(trans, true);
 607 }
 608
 609 static int iwl_trans_pcie_d3_resume(struct iwl_trans *trans,
 610                                     enum iwl_d3_status *status,
 611                                     bool test)
 612 {
 613         u32 val;
 614         int ret;
 615
 616         if (test) {
 617                 iwl_enable_interrupts(trans);
 618                 *status = IWL_D3_STATUS_ALIVE;
 619                 return 0;
 620         }
 621
 622         iwl_pcie_set_pwr(trans, false);
 623
 624         val = iwl_read32(trans, CSR_RESET);
 625         if (val & CSR_RESET_REG_FLAG_NEVO_RESET) {
 626                 *status = IWL_D3_STATUS_RESET;
 627                 return 0;
 628         }
 629
 630         /*
 631          * Also enables interrupts - none will happen as the device doesn't
 632          * know we're waking it up, only when the opmode actually tells it
 633          * after this call.
 634          */
 635         iwl_pcie_reset_ict(trans);
 636
 637         iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 638         iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 639
 640         ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
 641                            CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 642                            CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 643                            25000);
 644         if (ret) {
 645                 IWL_ERR(trans, "Failed to resume the device (mac ready)\n");
 646                 return ret;
 647         }
 648
 649         iwl_trans_pcie_tx_reset(trans);
 650
 651         ret = iwl_pcie_rx_init(trans);
 652         if (ret) {
 653                 IWL_ERR(trans, "Failed to resume the device (RX reset)\n");
 654                 return ret;
 655         }
 656
 657         *status = IWL_D3_STATUS_ALIVE;
 658         return 0;
 659 }
 660
 661 static int iwl_trans_pcie_start_hw(struct iwl_trans *trans)
 662 {
 663         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 664         bool hw_rfkill;
 665         int err;
 666
 667         err = iwl_pcie_prepare_card_hw(trans);
 668         if (err) {
 669                 IWL_ERR(trans, "Error while preparing HW: %d\n", err);
 670                 return err;
 671         }
 672
 673         /* Reset the entire device */
 674         iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 675
 676         usleep_range(10, 15);
 677
 678         iwl_pcie_apm_init(trans);
 679
 680         /* From now on, the op_mode will be kept updated about RF kill state */
 681         iwl_enable_rfkill_int(trans);
 682
 683         hw_rfkill = iwl_is_rfkill_set(trans);
 684         if (hw_rfkill)
 685                 set_bit(STATUS_RFKILL, &trans_pcie->status);
 686         else
 687                 clear_bit(STATUS_RFKILL, &trans_pcie->status);
 688         iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
 689
 690         return 0;
 691 }
 692
 693 static void iwl_trans_pcie_stop_hw(struct iwl_trans *trans,
 694                                    bool op_mode_leaving)
 695 {
 696         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 697         bool hw_rfkill;
 698         unsigned long flags;
 699
 700         spin_lock_irqsave(&trans_pcie->irq_lock, flags);
 701         iwl_disable_interrupts(trans);
 702         spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 703
 704         iwl_pcie_apm_stop(trans);
 705
 706         spin_lock_irqsave(&trans_pcie->irq_lock, flags);
 707         iwl_disable_interrupts(trans);
 708         spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 709
 710         iwl_pcie_disable_ict(trans);
 711
 712         if (!op_mode_leaving) {
 713                 /*
 714                  * Even if we stop the HW, we still want the RF kill
 715                  * interrupt
 716                  */
 717                 iwl_enable_rfkill_int(trans);
 718
 719                 /*
 720                  * Check again since the RF kill state may have changed while
 721                  * all the interrupts were disabled, in this case we couldn't
 722                  * receive the RF kill interrupt and update the state in the
 723                  * op_mode.
 724                  */
 725                 hw_rfkill = iwl_is_rfkill_set(trans);
 726                 if (hw_rfkill)
 727                         set_bit(STATUS_RFKILL, &trans_pcie->status);
 728                 else
 729                         clear_bit(STATUS_RFKILL, &trans_pcie->status);
 730                 iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
 731         }
 732 }
 733
 734 static void iwl_trans_pcie_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 735 {
 736         writeb(val, IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
 737 }
 738
 739 static void iwl_trans_pcie_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 740 {
 741         writel(val, IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
 742 }
 743
 744 static u32 iwl_trans_pcie_read32(struct iwl_trans *trans, u32 ofs)
 745 {
 746         return readl(IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
 747 }
 748
 749 static u32 iwl_trans_pcie_read_prph(struct iwl_trans *trans, u32 reg)
 750 {
 751         iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_RADDR,
 752                                ((reg & 0x000FFFFF) | (3 << 24)));
 753         return iwl_trans_pcie_read32(trans, HBUS_TARG_PRPH_RDAT);
 754 }
 755
 756 static void iwl_trans_pcie_write_prph(struct iwl_trans *trans, u32 addr,
 757                                       u32 val)
 758 {
 759         iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_WADDR,
 760                                ((addr & 0x000FFFFF) | (3 << 24)));
 761         iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_WDAT, val);
 762 }
 763
 764 static void iwl_trans_pcie_configure(struct iwl_trans *trans,
 765                                      const struct iwl_trans_config *trans_cfg)
 766 {
 767         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 768
 769         trans_pcie->cmd_queue = trans_cfg->cmd_queue;
 770         trans_pcie->cmd_fifo = trans_cfg->cmd_fifo;
 771         if (WARN_ON(trans_cfg->n_no_reclaim_cmds > MAX_NO_RECLAIM_CMDS))
 772                 trans_pcie->n_no_reclaim_cmds = 0;
 773         else
 774                 trans_pcie->n_no_reclaim_cmds = trans_cfg->n_no_reclaim_cmds;
 775         if (trans_pcie->n_no_reclaim_cmds)
 776                 memcpy(trans_pcie->no_reclaim_cmds, trans_cfg->no_reclaim_cmds,
 777                        trans_pcie->n_no_reclaim_cmds * sizeof(u8));
 778
 779         trans_pcie->rx_buf_size_8k = trans_cfg->rx_buf_size_8k;
 780         if (trans_pcie->rx_buf_size_8k)
 781                 trans_pcie->rx_page_order = get_order(8 * 1024);
 782         else
 783                 trans_pcie->rx_page_order = get_order(4 * 1024);
 784
 785         trans_pcie->wd_timeout =
 786                 msecs_to_jiffies(trans_cfg->queue_watchdog_timeout);
 787
 788         trans_pcie->command_names = trans_cfg->command_names;
 789         trans_pcie->bc_table_dword = trans_cfg->bc_table_dword;
 790 }
 791
 792 void iwl_trans_pcie_free(struct iwl_trans *trans)
 793 {
 794         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 795
 796         synchronize_irq(trans_pcie->pci_dev->irq);
 797
 798         iwl_pcie_tx_free(trans);
 799         iwl_pcie_rx_free(trans);
 800
 801         free_irq(trans_pcie->pci_dev->irq, trans);
 802         iwl_pcie_free_ict(trans);
 803
 804         pci_disable_msi(trans_pcie->pci_dev);
 805         iounmap(trans_pcie->hw_base);
 806         pci_release_regions(trans_pcie->pci_dev);
 807         pci_disable_device(trans_pcie->pci_dev);
 808         kmem_cache_destroy(trans->dev_cmd_pool);
 809
 810         kfree(trans);
 811 }
 812
 813 static void iwl_trans_pcie_set_pmi(struct iwl_trans *trans, bool state)
 814 {
 815         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 816
 817         if (state)
 818                 set_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
 819         else
 820                 clear_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
 821 }
 822
 823 static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans, bool silent,
 824                                                 unsigned long *flags)
 825 {
 826         int ret;
 827         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 828
 829         spin_lock_irqsave(&trans_pcie->reg_lock, *flags);
 830
 831         /* this bit wakes up the NIC */
 832         __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
 833                                  CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 834
 835         /*
 836          * These bits say the device is running, and should keep running for
 837          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
 838          * but they do not indicate that embedded SRAM is restored yet;
 839          * 3945 and 4965 have volatile SRAM, and must save/restore contents
 840          * to/from host DRAM when sleeping/waking for power-saving.
 841          * Each direction takes approximately 1/4 millisecond; with this
 842          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
 843          * series of register accesses are expected (e.g. reading Event Log),
 844          * to keep device from sleeping.
 845          *
 846          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
 847          * SRAM is okay/restored.  We don't check that here because this call
 848          * is just for hardware register access; but GP1 MAC_SLEEP check is a
 849          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
 850          *
 851          * 5000 series and later (including 1000 series) have non-volatile SRAM,
 852          * and do not save/restore SRAM when power cycling.
 853          */
 854         ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
 855                            CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 856                            (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 857                             CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 858         if (unlikely(ret < 0)) {
 859                 iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 860                 if (!silent) {
 861                         u32 val = iwl_read32(trans, CSR_GP_CNTRL);
 862                         WARN_ONCE(1,
 863                                   "Timeout waiting for hardware access (CSR_GP_CNTRL 0x%08x)\n",
 864                                   val);
 865                         spin_unlock_irqrestore(&trans_pcie->reg_lock, *flags);
 866                         return false;
 867                 }
 868         }
 869
 870         /*
 871          * Fool sparse by faking we release the lock - sparse will
 872          * track nic_access anyway.
 873          */
 874         __release(&trans_pcie->reg_lock);
 875         return true;
 876 }
 877
 878 static void iwl_trans_pcie_release_nic_access(struct iwl_trans *trans,
 879                                               unsigned long *flags)
 880 {
 881         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 882
 883         lockdep_assert_held(&trans_pcie->reg_lock);
 884
 885         /*
 886          * Fool sparse by faking we acquiring the lock - sparse will
 887          * track nic_access anyway.
 888          */
 889         __acquire(&trans_pcie->reg_lock);
 890
 891         __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
 892                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 893         /*
 894          * Above we read the CSR_GP_CNTRL register, which will flush
 895          * any previous writes, but we need the write that clears the
 896          * MAC_ACCESS_REQ bit to be performed before any other writes
 897          * scheduled on different CPUs (after we drop reg_lock).
 898          */
 899         mmiowb();
 900         spin_unlock_irqrestore(&trans_pcie->reg_lock, *flags);
 901 }
 902
 903 static int iwl_trans_pcie_read_mem(struct iwl_trans *trans, u32 addr,
 904                                    void *buf, int dwords)
 905 {
 906         unsigned long flags;
 907         int offs, ret = 0;
 908         u32 *vals = buf;
 909
 910         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 911                 iwl_write32(trans, HBUS_TARG_MEM_RADDR, addr);
 912                 for (offs = 0; offs < dwords; offs++)
 913                         vals[offs] = iwl_read32(trans, HBUS_TARG_MEM_RDAT);
 914                 iwl_trans_release_nic_access(trans, &flags);
 915         } else {
 916                 ret = -EBUSY;
 917         }
 918         return ret;
 919 }
 920
 921 static int iwl_trans_pcie_write_mem(struct iwl_trans *trans, u32 addr,
 922                                     const void *buf, int dwords)
 923 {
 924         unsigned long flags;
 925         int offs, ret = 0;
 926         const u32 *vals = buf;
 927
 928         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 929                 iwl_write32(trans, HBUS_TARG_MEM_WADDR, addr);
 930                 for (offs = 0; offs < dwords; offs++)
 931                         iwl_write32(trans, HBUS_TARG_MEM_WDAT,
 932                                     vals ? vals[offs] : 0);
 933                 iwl_trans_release_nic_access(trans, &flags);
 934         } else {
 935                 ret = -EBUSY;
 936         }
 937         return ret;
 938 }
 939
 940 #define IWL_FLUSH_WAIT_MS       2000
 941
 942 static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans)
 943 {
 944         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 945         struct iwl_txq *txq;
 946         struct iwl_queue *q;
 947         int cnt;
 948         unsigned long now = jiffies;
 949         u32 scd_sram_addr;
 950         u8 buf[16];
 951         int ret = 0;
 952
 953         /* waiting for all the tx frames complete might take a while */
 954         for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
 955                 if (cnt == trans_pcie->cmd_queue)
 956                         continue;
 957                 txq = &trans_pcie->txq[cnt];
 958                 q = &txq->q;
 959                 while (q->read_ptr != q->write_ptr && !time_after(jiffies,
 960                        now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS)))
 961                         msleep(1);
 962
 963                 if (q->read_ptr != q->write_ptr) {
 964                         IWL_ERR(trans,
 965                                 "fail to flush all tx fifo queues Q %d\n", cnt);
 966                         ret = -ETIMEDOUT;
 967                         break;
 968                 }
 969         }
 970
 971         if (!ret)
 972                 return 0;
 973
 974         IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n",
 975                 txq->q.read_ptr, txq->q.write_ptr);
 976
 977         scd_sram_addr = trans_pcie->scd_base_addr +
 978                         SCD_TX_STTS_QUEUE_OFFSET(txq->q.id);
 979         iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf));
 980
 981         iwl_print_hex_error(trans, buf, sizeof(buf));
 982
 983         for (cnt = 0; cnt < FH_TCSR_CHNL_NUM; cnt++)
 984                 IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", cnt,
 985                         iwl_read_direct32(trans, FH_TX_TRB_REG(cnt)));
 986
 987         for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
 988                 u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(cnt));
 989                 u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
 990                 bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));
 991                 u32 tbl_dw =
 992                         iwl_trans_read_mem32(trans, trans_pcie->scd_base_addr +
 993                                              SCD_TRANS_TBL_OFFSET_QUEUE(cnt));
 994
 995                 if (cnt & 0x1)
 996                         tbl_dw = (tbl_dw & 0xFFFF0000) >> 16;
 997                 else
 998                         tbl_dw = tbl_dw & 0x0000FFFF;
 999
1000                 IWL_ERR(trans,
1001                         "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
1002                         cnt, active ? "" : "in", fifo, tbl_dw,
1003                         iwl_read_prph(trans,
1004                                       SCD_QUEUE_RDPTR(cnt)) & (txq->q.n_bd - 1),
1005                         iwl_read_prph(trans, SCD_QUEUE_WRPTR(cnt)));
1006         }
1007
1008         return ret;
1009 }
1010
1011 static void iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans, u32 reg,
1012                                          u32 mask, u32 value)
1013 {
1014         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1015         unsigned long flags;
1016
1017         spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1018         __iwl_trans_pcie_set_bits_mask(trans, reg, mask, value);
1019         spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1020 }
1021
1022 static const char *get_csr_string(int cmd)
1023 {
1024 #define IWL_CMD(x) case x: return #x
1025         switch (cmd) {
1026         IWL_CMD(CSR_HW_IF_CONFIG_REG);
1027         IWL_CMD(CSR_INT_COALESCING);
1028         IWL_CMD(CSR_INT);
1029         IWL_CMD(CSR_INT_MASK);
1030         IWL_CMD(CSR_FH_INT_STATUS);
1031         IWL_CMD(CSR_GPIO_IN);
1032         IWL_CMD(CSR_RESET);
1033         IWL_CMD(CSR_GP_CNTRL);
1034         IWL_CMD(CSR_HW_REV);
1035         IWL_CMD(CSR_EEPROM_REG);
1036         IWL_CMD(CSR_EEPROM_GP);
1037         IWL_CMD(CSR_OTP_GP_REG);
1038         IWL_CMD(CSR_GIO_REG);
1039         IWL_CMD(CSR_GP_UCODE_REG);
1040         IWL_CMD(CSR_GP_DRIVER_REG);
1041         IWL_CMD(CSR_UCODE_DRV_GP1);
1042         IWL_CMD(CSR_UCODE_DRV_GP2);
1043         IWL_CMD(CSR_LED_REG);
1044         IWL_CMD(CSR_DRAM_INT_TBL_REG);
1045         IWL_CMD(CSR_GIO_CHICKEN_BITS);
1046         IWL_CMD(CSR_ANA_PLL_CFG);
1047         IWL_CMD(CSR_HW_REV_WA_REG);
1048         IWL_CMD(CSR_DBG_HPET_MEM_REG);
1049         default:
1050                 return "UNKNOWN";
1051         }
1052 #undef IWL_CMD
1053 }
1054
1055 void iwl_pcie_dump_csr(struct iwl_trans *trans)
1056 {
1057         int i;
1058         static const u32 csr_tbl[] = {
1059                 CSR_HW_IF_CONFIG_REG,
1060                 CSR_INT_COALESCING,
1061                 CSR_INT,
1062                 CSR_INT_MASK,
1063                 CSR_FH_INT_STATUS,
1064                 CSR_GPIO_IN,
1065                 CSR_RESET,
1066                 CSR_GP_CNTRL,
1067                 CSR_HW_REV,
1068                 CSR_EEPROM_REG,
1069                 CSR_EEPROM_GP,
1070                 CSR_OTP_GP_REG,
1071                 CSR_GIO_REG,
1072                 CSR_GP_UCODE_REG,
1073                 CSR_GP_DRIVER_REG,
1074                 CSR_UCODE_DRV_GP1,
1075                 CSR_UCODE_DRV_GP2,
1076                 CSR_LED_REG,
1077                 CSR_DRAM_INT_TBL_REG,
1078                 CSR_GIO_CHICKEN_BITS,
1079                 CSR_ANA_PLL_CFG,
1080                 CSR_HW_REV_WA_REG,
1081                 CSR_DBG_HPET_MEM_REG
1082         };
1083         IWL_ERR(trans, "CSR values:\n");
1084         IWL_ERR(trans, "(2nd byte of CSR_INT_COALESCING is "
1085                 "CSR_INT_PERIODIC_REG)\n");
1086         for (i = 0; i <  ARRAY_SIZE(csr_tbl); i++) {
1087                 IWL_ERR(trans, "  %25s: 0X%08x\n",
1088                         get_csr_string(csr_tbl[i]),
1089                         iwl_read32(trans, csr_tbl[i]));
1090         }
1091 }
1092
1093 #ifdef CONFIG_IWLWIFI_DEBUGFS
1094 /* create and remove of files */
1095 #define DEBUGFS_ADD_FILE(name, parent, mode) do {                       \
1096         if (!debugfs_create_file(#name, mode, parent, trans,            \
1097                                  &iwl_dbgfs_##name##_ops))              \
1098                 goto err;                                               \
1099 } while (0)
1100
1101 /* file operation */
1102 #define DEBUGFS_READ_FILE_OPS(name)                                     \
1103 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
1104         .read = iwl_dbgfs_##name##_read,                                \
1105         .open = simple_open,                                            \
1106         .llseek = generic_file_llseek,                                  \
1107 };
1108
1109 #define DEBUGFS_WRITE_FILE_OPS(name)                                    \
1110 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
1111         .write = iwl_dbgfs_##name##_write,                              \
1112         .open = simple_open,                                            \
1113         .llseek = generic_file_llseek,                                  \
1114 };
1115
1116 #define DEBUGFS_READ_WRITE_FILE_OPS(name)                               \
1117 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
1118         .write = iwl_dbgfs_##name##_write,                              \
1119         .read = iwl_dbgfs_##name##_read,                                \
1120         .open = simple_open,                                            \
1121         .llseek = generic_file_llseek,                                  \
1122 };
1123
1124 static ssize_t iwl_dbgfs_tx_queue_read(struct file *file,
1125                                        char __user *user_buf,
1126                                        size_t count, loff_t *ppos)
1127 {
1128         struct iwl_trans *trans = file->private_data;
1129         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1130         struct iwl_txq *txq;
1131         struct iwl_queue *q;
1132         char *buf;
1133         int pos = 0;
1134         int cnt;
1135         int ret;
1136         size_t bufsz;
1137
1138         bufsz = sizeof(char) * 64 * trans->cfg->base_params->num_of_queues;
1139
1140         if (!trans_pcie->txq)
1141                 return -EAGAIN;
1142
1143         buf = kzalloc(bufsz, GFP_KERNEL);
1144         if (!buf)
1145                 return -ENOMEM;
1146
1147         for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
1148                 txq = &trans_pcie->txq[cnt];
1149                 q = &txq->q;
1150                 pos += scnprintf(buf + pos, bufsz - pos,
1151                                 "hwq %.2d: read=%u write=%u use=%d stop=%d\n",
1152                                 cnt, q->read_ptr, q->write_ptr,
1153                                 !!test_bit(cnt, trans_pcie->queue_used),
1154                                 !!test_bit(cnt, trans_pcie->queue_stopped));
1155         }
1156         ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
1157         kfree(buf);
1158         return ret;
1159 }
1160
1161 static ssize_t iwl_dbgfs_rx_queue_read(struct file *file,
1162                                        char __user *user_buf,
1163                                        size_t count, loff_t *ppos)
1164 {
1165         struct iwl_trans *trans = file->private_data;
1166         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1167         struct iwl_rxq *rxq = &trans_pcie->rxq;
1168         char buf[256];
1169         int pos = 0;
1170         const size_t bufsz = sizeof(buf);
1171
1172         pos += scnprintf(buf + pos, bufsz - pos, "read: %u\n",
1173                                                 rxq->read);
1174         pos += scnprintf(buf + pos, bufsz - pos, "write: %u\n",
1175                                                 rxq->write);
1176         pos += scnprintf(buf + pos, bufsz - pos, "free_count: %u\n",
1177                                                 rxq->free_count);
1178         if (rxq->rb_stts) {
1179                 pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
1180                          le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF);
1181         } else {
1182                 pos += scnprintf(buf + pos, bufsz - pos,
1183                                         "closed_rb_num: Not Allocated\n");
1184         }
1185         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
1186 }
1187
1188 static ssize_t iwl_dbgfs_interrupt_read(struct file *file,
1189                                         char __user *user_buf,
1190                                         size_t count, loff_t *ppos)
1191 {
1192         struct iwl_trans *trans = file->private_data;
1193         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1194         struct isr_statistics *isr_stats = &trans_pcie->isr_stats;
1195
1196         int pos = 0;
1197         char *buf;
1198         int bufsz = 24 * 64; /* 24 items * 64 char per item */
1199         ssize_t ret;
1200
1201         buf = kzalloc(bufsz, GFP_KERNEL);
1202         if (!buf)
1203                 return -ENOMEM;
1204
1205         pos += scnprintf(buf + pos, bufsz - pos,
1206                         "Interrupt Statistics Report:\n");
1207
1208         pos += scnprintf(buf + pos, bufsz - pos, "HW Error:\t\t\t %u\n",
1209                 isr_stats->hw);
1210         pos += scnprintf(buf + pos, bufsz - pos, "SW Error:\t\t\t %u\n",
1211                 isr_stats->sw);
1212         if (isr_stats->sw || isr_stats->hw) {
1213                 pos += scnprintf(buf + pos, bufsz - pos,
1214                         "\tLast Restarting Code:  0x%X\n",
1215                         isr_stats->err_code);
1216         }
1217 #ifdef CONFIG_IWLWIFI_DEBUG
1218         pos += scnprintf(buf + pos, bufsz - pos, "Frame transmitted:\t\t %u\n",
1219                 isr_stats->sch);
1220         pos += scnprintf(buf + pos, bufsz - pos, "Alive interrupt:\t\t %u\n",
1221                 isr_stats->alive);
1222 #endif
1223         pos += scnprintf(buf + pos, bufsz - pos,
1224                 "HW RF KILL switch toggled:\t %u\n", isr_stats->rfkill);
1225
1226         pos += scnprintf(buf + pos, bufsz - pos, "CT KILL:\t\t\t %u\n",
1227                 isr_stats->ctkill);
1228
1229         pos += scnprintf(buf + pos, bufsz - pos, "Wakeup Interrupt:\t\t %u\n",
1230                 isr_stats->wakeup);
1231
1232         pos += scnprintf(buf + pos, bufsz - pos,
1233                 "Rx command responses:\t\t %u\n", isr_stats->rx);
1234
1235         pos += scnprintf(buf + pos, bufsz - pos, "Tx/FH interrupt:\t\t %u\n",
1236                 isr_stats->tx);
1237
1238         pos += scnprintf(buf + pos, bufsz - pos, "Unexpected INTA:\t\t %u\n",
1239                 isr_stats->unhandled);
1240
1241         ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
1242         kfree(buf);
1243         return ret;
1244 }
1245
1246 static ssize_t iwl_dbgfs_interrupt_write(struct file *file,
1247                                          const char __user *user_buf,
1248                                          size_t count, loff_t *ppos)
1249 {
1250         struct iwl_trans *trans = file->private_data;
1251         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1252         struct isr_statistics *isr_stats = &trans_pcie->isr_stats;
1253
1254         char buf[8];
1255         int buf_size;
1256         u32 reset_flag;
1257
1258         memset(buf, 0, sizeof(buf));
1259         buf_size = min(count, sizeof(buf) -  1);
1260         if (copy_from_user(buf, user_buf, buf_size))
1261                 return -EFAULT;
1262         if (sscanf(buf, "%x", &reset_flag) != 1)
1263                 return -EFAULT;
1264         if (reset_flag == 0)
1265                 memset(isr_stats, 0, sizeof(*isr_stats));
1266
1267         return count;
1268 }
1269
1270 static ssize_t iwl_dbgfs_csr_write(struct file *file,
1271                                    const char __user *user_buf,
1272                                    size_t count, loff_t *ppos)
1273 {
1274         struct iwl_trans *trans = file->private_data;
1275         char buf[8];
1276         int buf_size;
1277         int csr;
1278
1279         memset(buf, 0, sizeof(buf));
1280         buf_size = min(count, sizeof(buf) -  1);
1281         if (copy_from_user(buf, user_buf, buf_size))
1282                 return -EFAULT;
1283         if (sscanf(buf, "%d", &csr) != 1)
1284                 return -EFAULT;
1285
1286         iwl_pcie_dump_csr(trans);
1287
1288         return count;
1289 }
1290
1291 static ssize_t iwl_dbgfs_fh_reg_read(struct file *file,
1292                                      char __user *user_buf,
1293                                      size_t count, loff_t *ppos)
1294 {
1295         struct iwl_trans *trans = file->private_data;
1296         char *buf = NULL;
1297         int pos = 0;
1298         ssize_t ret = -EFAULT;
1299
1300         ret = pos = iwl_dump_fh(trans, &buf);
1301         if (buf) {
1302                 ret = simple_read_from_buffer(user_buf,
1303                                               count, ppos, buf, pos);
1304                 kfree(buf);
1305         }
1306
1307         return ret;
1308 }
1309
1310 DEBUGFS_READ_WRITE_FILE_OPS(interrupt);
1311 DEBUGFS_READ_FILE_OPS(fh_reg);
1312 DEBUGFS_READ_FILE_OPS(rx_queue);
1313 DEBUGFS_READ_FILE_OPS(tx_queue);
1314 DEBUGFS_WRITE_FILE_OPS(csr);
1315
1316 /*
1317  * Create the debugfs files and directories
1318  *
1319  */
1320 static int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans,
1321                                          struct dentry *dir)
1322 {
1323         DEBUGFS_ADD_FILE(rx_queue, dir, S_IRUSR);
1324         DEBUGFS_ADD_FILE(tx_queue, dir, S_IRUSR);
1325         DEBUGFS_ADD_FILE(interrupt, dir, S_IWUSR | S_IRUSR);
1326         DEBUGFS_ADD_FILE(csr, dir, S_IWUSR);
1327         DEBUGFS_ADD_FILE(fh_reg, dir, S_IRUSR);
1328         return 0;
1329
1330 err:
1331         IWL_ERR(trans, "failed to create the trans debugfs entry\n");
1332         return -ENOMEM;
1333 }
1334 #else
1335 static int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans,
1336                                          struct dentry *dir)
1337 {
1338         return 0;
1339 }
1340 #endif /*CONFIG_IWLWIFI_DEBUGFS */
1341
1342 static const struct iwl_trans_ops trans_ops_pcie = {
1343         .start_hw = iwl_trans_pcie_start_hw,
1344         .stop_hw = iwl_trans_pcie_stop_hw,
1345         .fw_alive = iwl_trans_pcie_fw_alive,
1346         .start_fw = iwl_trans_pcie_start_fw,
1347         .stop_device = iwl_trans_pcie_stop_device,
1348
1349         .d3_suspend = iwl_trans_pcie_d3_suspend,
1350         .d3_resume = iwl_trans_pcie_d3_resume,
1351
1352         .send_cmd = iwl_trans_pcie_send_hcmd,
1353
1354         .tx = iwl_trans_pcie_tx,
1355         .reclaim = iwl_trans_pcie_reclaim,
1356
1357         .txq_disable = iwl_trans_pcie_txq_disable,
1358         .txq_enable = iwl_trans_pcie_txq_enable,
1359
1360         .dbgfs_register = iwl_trans_pcie_dbgfs_register,
1361
1362         .wait_tx_queue_empty = iwl_trans_pcie_wait_txq_empty,
1363
1364         .write8 = iwl_trans_pcie_write8,
1365         .write32 = iwl_trans_pcie_write32,
1366         .read32 = iwl_trans_pcie_read32,
1367         .read_prph = iwl_trans_pcie_read_prph,
1368         .write_prph = iwl_trans_pcie_write_prph,
1369         .read_mem = iwl_trans_pcie_read_mem,
1370         .write_mem = iwl_trans_pcie_write_mem,
1371         .configure = iwl_trans_pcie_configure,
1372         .set_pmi = iwl_trans_pcie_set_pmi,
1373         .grab_nic_access = iwl_trans_pcie_grab_nic_access,
1374         .release_nic_access = iwl_trans_pcie_release_nic_access,
1375         .set_bits_mask = iwl_trans_pcie_set_bits_mask,
1376 };
1377
1378 struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
1379                                        const struct pci_device_id *ent,
1380                                        const struct iwl_cfg *cfg)
1381 {
1382         struct iwl_trans_pcie *trans_pcie;
1383         struct iwl_trans *trans;
1384         u16 pci_cmd;
1385         int err;
1386
1387         trans = kzalloc(sizeof(struct iwl_trans) +
1388                         sizeof(struct iwl_trans_pcie), GFP_KERNEL);
1389         if (!trans) {
1390                 err = -ENOMEM;
1391                 goto out;
1392         }
1393
1394         trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1395
1396         trans->ops = &trans_ops_pcie;
1397         trans->cfg = cfg;
1398         trans_lockdep_init(trans);
1399         trans_pcie->trans = trans;
1400         spin_lock_init(&trans_pcie->irq_lock);
1401         spin_lock_init(&trans_pcie->reg_lock);
1402         init_waitqueue_head(&trans_pcie->ucode_write_waitq);
1403
1404         err = pci_enable_device(pdev);
1405         if (err)
1406                 goto out_no_pci;
1407
1408         if (!cfg->base_params->pcie_l1_allowed) {
1409                 /*
1410                  * W/A - seems to solve weird behavior. We need to remove this
1411                  * if we don't want to stay in L1 all the time. This wastes a
1412                  * lot of power.
1413                  */
1414                 pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
1415                                        PCIE_LINK_STATE_L1 |
1416                                        PCIE_LINK_STATE_CLKPM);
1417         }
1418
1419         pci_set_master(pdev);
1420
1421         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
1422         if (!err)
1423                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(36));
1424         if (err) {
1425                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1426                 if (!err)
1427                         err = pci_set_consistent_dma_mask(pdev,
1428                                                           DMA_BIT_MASK(32));
1429                 /* both attempts failed: */
1430                 if (err) {
1431                         dev_err(&pdev->dev, "No suitable DMA available\n");
1432                         goto out_pci_disable_device;
1433                 }
1434         }
1435
1436         err = pci_request_regions(pdev, DRV_NAME);
1437         if (err) {
1438                 dev_err(&pdev->dev, "pci_request_regions failed\n");
1439                 goto out_pci_disable_device;
1440         }
1441
1442         trans_pcie->hw_base = pci_ioremap_bar(pdev, 0);
1443         if (!trans_pcie->hw_base) {
1444                 dev_err(&pdev->dev, "pci_ioremap_bar failed\n");
1445                 err = -ENODEV;
1446                 goto out_pci_release_regions;
1447         }
1448
1449         /* We disable the RETRY_TIMEOUT register (0x41) to keep
1450          * PCI Tx retries from interfering with C3 CPU state */
1451         pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
1452
1453         err = pci_enable_msi(pdev);
1454         if (err) {
1455                 dev_err(&pdev->dev, "pci_enable_msi failed(0X%x)\n", err);
1456                 /* enable rfkill interrupt: hw bug w/a */
1457                 pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
1458                 if (pci_cmd & PCI_COMMAND_INTX_DISABLE) {
1459                         pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
1460                         pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
1461                 }
1462         }
1463
1464         trans->dev = &pdev->dev;
1465         trans_pcie->pci_dev = pdev;
1466         trans->hw_rev = iwl_read32(trans, CSR_HW_REV);
1467         trans->hw_id = (pdev->device << 16) + pdev->subsystem_device;
1468         snprintf(trans->hw_id_str, sizeof(trans->hw_id_str),
1469                  "PCI ID: 0x%04X:0x%04X", pdev->device, pdev->subsystem_device);
1470
1471         /* Initialize the wait queue for commands */
1472         init_waitqueue_head(&trans_pcie->wait_command_queue);
1473
1474         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
1475                  "iwl_cmd_pool:%s", dev_name(trans->dev));
1476
1477         trans->dev_cmd_headroom = 0;
1478         trans->dev_cmd_pool =
1479                 kmem_cache_create(trans->dev_cmd_pool_name,
1480                                   sizeof(struct iwl_device_cmd)
1481                                   + trans->dev_cmd_headroom,
1482                                   sizeof(void *),
1483                                   SLAB_HWCACHE_ALIGN,
1484                                   NULL);
1485
1486         if (!trans->dev_cmd_pool) {
1487                 err = -ENOMEM;
1488                 goto out_pci_disable_msi;
1489         }
1490
1491         trans_pcie->inta_mask = CSR_INI_SET_MASK;
1492
1493         if (iwl_pcie_alloc_ict(trans))
1494                 goto out_free_cmd_pool;
1495
1496         err = request_threaded_irq(pdev->irq, iwl_pcie_isr_ict,
1497                                    iwl_pcie_irq_handler,
1498                                    IRQF_SHARED, DRV_NAME, trans);
1499         if (err) {
1500                 IWL_ERR(trans, "Error allocating IRQ %d\n", pdev->irq);
1501                 goto out_free_ict;
1502         }
1503
1504         return trans;
1505
1506 out_free_ict:
1507         iwl_pcie_free_ict(trans);
1508 out_free_cmd_pool:
1509         kmem_cache_destroy(trans->dev_cmd_pool);
1510 out_pci_disable_msi:
1511         pci_disable_msi(pdev);
1512 out_pci_release_regions:
1513         pci_release_regions(pdev);
1514 out_pci_disable_device:
1515         pci_disable_device(pdev);
1516 out_no_pci:
1517         kfree(trans);
1518 out:
1519         return ERR_PTR(err);
1520 }