drivers/usb/phy/phy-ab8500-usb.c

   1 /*
   2  * drivers/usb/otg/ab8500_usb.c
   3  *
   4  * USB transceiver driver for AB8500 family chips
   5  *
   6  * Copyright (C) 2010-2013 ST-Ericsson AB
   7  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
   8  * Avinash Kumar <avinash.kumar@stericsson.com>
   9  * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/slab.h>
  31 #include <linux/notifier.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/delay.h>
  34 #include <linux/clk.h>
  35 #include <linux/err.h>
  36 #include <linux/mfd/abx500.h>
  37 #include <linux/mfd/abx500/ab8500.h>
  38 #include <linux/usb/musb-ux500.h>
  39 #include <linux/regulator/consumer.h>
  40 #include <linux/pinctrl/consumer.h>
  41
  42 /* Bank AB8500_SYS_CTRL2_BLOCK */
  43 #define AB8500_MAIN_WD_CTRL_REG 0x01
  44
  45 /* Bank AB8500_USB */
  46 #define AB8500_USB_LINE_STAT_REG 0x80
  47 #define AB8505_USB_LINE_STAT_REG 0x94
  48 #define AB8540_USB_LINK_STAT_REG 0x94
  49 #define AB9540_USB_LINK_STAT_REG 0x94
  50 #define AB8540_USB_OTG_CTL_REG 0x87
  51 #define AB8500_USB_PHY_CTRL_REG 0x8A
  52 #define AB8540_VBUS_CTRL_REG 0x82
  53
  54 /* Bank AB8500_DEVELOPMENT */
  55 #define AB8500_BANK12_ACCESS 0x00
  56
  57 /* Bank AB8500_DEBUG */
  58 #define AB8540_DEBUG 0x32
  59 #define AB8500_USB_PHY_TUNE1 0x05
  60 #define AB8500_USB_PHY_TUNE2 0x06
  61 #define AB8500_USB_PHY_TUNE3 0x07
  62
  63 /* Bank AB8500_INTERRUPT */
  64 #define AB8500_IT_SOURCE2_REG 0x01
  65
  66 #define AB8500_BIT_OTG_STAT_ID (1 << 0)
  67 #define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
  68 #define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
  69 #define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
  70 #define AB8500_BIT_WD_CTRL_KICK (1 << 1)
  71 #define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
  72 #define AB8540_BIT_OTG_CTL_VBUS_VALID_ENA (1 << 0)
  73 #define AB8540_BIT_OTG_CTL_ID_HOST_ENA (1 << 1)
  74 #define AB8540_BIT_OTG_CTL_ID_DEV_ENA (1 << 5)
  75 #define AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA (1 << 0)
  76
  77 #define AB8500_WD_KICK_DELAY_US 100 /* usec */
  78 #define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
  79 #define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
  80
  81 /* Usb line status register */
  82 enum ab8500_usb_link_status {
  83         USB_LINK_NOT_CONFIGURED_8500 = 0,
  84         USB_LINK_STD_HOST_NC_8500,
  85         USB_LINK_STD_HOST_C_NS_8500,
  86         USB_LINK_STD_HOST_C_S_8500,
  87         USB_LINK_HOST_CHG_NM_8500,
  88         USB_LINK_HOST_CHG_HS_8500,
  89         USB_LINK_HOST_CHG_HS_CHIRP_8500,
  90         USB_LINK_DEDICATED_CHG_8500,
  91         USB_LINK_ACA_RID_A_8500,
  92         USB_LINK_ACA_RID_B_8500,
  93         USB_LINK_ACA_RID_C_NM_8500,
  94         USB_LINK_ACA_RID_C_HS_8500,
  95         USB_LINK_ACA_RID_C_HS_CHIRP_8500,
  96         USB_LINK_HM_IDGND_8500,
  97         USB_LINK_RESERVED_8500,
  98         USB_LINK_NOT_VALID_LINK_8500,
  99 };
 100
 101 enum ab8505_usb_link_status {
 102         USB_LINK_NOT_CONFIGURED_8505 = 0,
 103         USB_LINK_STD_HOST_NC_8505,
 104         USB_LINK_STD_HOST_C_NS_8505,
 105         USB_LINK_STD_HOST_C_S_8505,
 106         USB_LINK_CDP_8505,
 107         USB_LINK_RESERVED0_8505,
 108         USB_LINK_RESERVED1_8505,
 109         USB_LINK_DEDICATED_CHG_8505,
 110         USB_LINK_ACA_RID_A_8505,
 111         USB_LINK_ACA_RID_B_8505,
 112         USB_LINK_ACA_RID_C_NM_8505,
 113         USB_LINK_RESERVED2_8505,
 114         USB_LINK_RESERVED3_8505,
 115         USB_LINK_HM_IDGND_8505,
 116         USB_LINK_CHARGERPORT_NOT_OK_8505,
 117         USB_LINK_CHARGER_DM_HIGH_8505,
 118         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
 119         USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
 120         USB_LINK_STD_UPSTREAM_8505,
 121         USB_LINK_CHARGER_SE1_8505,
 122         USB_LINK_CARKIT_CHGR_1_8505,
 123         USB_LINK_CARKIT_CHGR_2_8505,
 124         USB_LINK_ACA_DOCK_CHGR_8505,
 125         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
 126         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
 127         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
 128         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
 129         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
 130 };
 131
 132 enum ab8540_usb_link_status {
 133         USB_LINK_NOT_CONFIGURED_8540 = 0,
 134         USB_LINK_STD_HOST_NC_8540,
 135         USB_LINK_STD_HOST_C_NS_8540,
 136         USB_LINK_STD_HOST_C_S_8540,
 137         USB_LINK_CDP_8540,
 138         USB_LINK_RESERVED0_8540,
 139         USB_LINK_RESERVED1_8540,
 140         USB_LINK_DEDICATED_CHG_8540,
 141         USB_LINK_ACA_RID_A_8540,
 142         USB_LINK_ACA_RID_B_8540,
 143         USB_LINK_ACA_RID_C_NM_8540,
 144         USB_LINK_RESERVED2_8540,
 145         USB_LINK_RESERVED3_8540,
 146         USB_LINK_HM_IDGND_8540,
 147         USB_LINK_CHARGERPORT_NOT_OK_8540,
 148         USB_LINK_CHARGER_DM_HIGH_8540,
 149         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540,
 150         USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540,
 151         USB_LINK_STD_UPSTREAM_8540,
 152         USB_LINK_CHARGER_SE1_8540,
 153         USB_LINK_CARKIT_CHGR_1_8540,
 154         USB_LINK_CARKIT_CHGR_2_8540,
 155         USB_LINK_ACA_DOCK_CHGR_8540,
 156         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8540,
 157         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8540,
 158         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8540,
 159         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8540,
 160         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8540
 161 };
 162
 163 enum ab9540_usb_link_status {
 164         USB_LINK_NOT_CONFIGURED_9540 = 0,
 165         USB_LINK_STD_HOST_NC_9540,
 166         USB_LINK_STD_HOST_C_NS_9540,
 167         USB_LINK_STD_HOST_C_S_9540,
 168         USB_LINK_CDP_9540,
 169         USB_LINK_RESERVED0_9540,
 170         USB_LINK_RESERVED1_9540,
 171         USB_LINK_DEDICATED_CHG_9540,
 172         USB_LINK_ACA_RID_A_9540,
 173         USB_LINK_ACA_RID_B_9540,
 174         USB_LINK_ACA_RID_C_NM_9540,
 175         USB_LINK_RESERVED2_9540,
 176         USB_LINK_RESERVED3_9540,
 177         USB_LINK_HM_IDGND_9540,
 178         USB_LINK_CHARGERPORT_NOT_OK_9540,
 179         USB_LINK_CHARGER_DM_HIGH_9540,
 180         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540,
 181         USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540,
 182         USB_LINK_STD_UPSTREAM_9540,
 183         USB_LINK_CHARGER_SE1_9540,
 184         USB_LINK_CARKIT_CHGR_1_9540,
 185         USB_LINK_CARKIT_CHGR_2_9540,
 186         USB_LINK_ACA_DOCK_CHGR_9540,
 187         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_9540,
 188         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_9540,
 189         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_9540,
 190         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_9540,
 191         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_9540
 192 };
 193
 194 enum ab8500_usb_mode {
 195         USB_IDLE = 0,
 196         USB_PERIPHERAL,
 197         USB_HOST,
 198         USB_DEDICATED_CHG
 199 };
 200
 201 /* Register USB_LINK_STATUS interrupt */
 202 #define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ     (1 << 0)
 203 /* Register ID_WAKEUP_F interrupt */
 204 #define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ       (1 << 1)
 205 /* Register VBUS_DET_F interrupt */
 206 #define AB8500_USB_FLAG_USE_VBUS_DET_IRQ        (1 << 2)
 207 /* Driver is using the ab-iddet driver*/
 208 #define AB8500_USB_FLAG_USE_AB_IDDET            (1 << 3)
 209 /* Enable setting regulators voltage */
 210 #define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE   (1 << 4)
 211 /* Enable the check_vbus_status workaround */
 212 #define AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS   (1 << 5)
 213 /* Enable the vbus host workaround */
 214 #define AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK     (1 << 6)
 215
 216 struct ab8500_usb {
 217         struct usb_phy phy;
 218         struct device *dev;
 219         struct ab8500 *ab8500;
 220         unsigned vbus_draw;
 221         struct work_struct phy_dis_work;
 222         struct work_struct vbus_event_work;
 223         enum ab8500_usb_mode mode;
 224         struct clk *sysclk;
 225         struct regulator *v_ape;
 226         struct regulator *v_musb;
 227         struct regulator *v_ulpi;
 228         int saved_v_ulpi;
 229         int previous_link_status_state;
 230         struct pinctrl *pinctrl;
 231         struct pinctrl_state *pins_sleep;
 232         bool enabled_charging_detection;
 233         unsigned int flags;
 234 };
 235
 236 static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
 237 {
 238         return container_of(x, struct ab8500_usb, phy);
 239 }
 240
 241 static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
 242 {
 243         abx500_set_register_interruptible(ab->dev,
 244                 AB8500_SYS_CTRL2_BLOCK,
 245                 AB8500_MAIN_WD_CTRL_REG,
 246                 AB8500_BIT_WD_CTRL_ENABLE);
 247
 248         udelay(AB8500_WD_KICK_DELAY_US);
 249
 250         abx500_set_register_interruptible(ab->dev,
 251                 AB8500_SYS_CTRL2_BLOCK,
 252                 AB8500_MAIN_WD_CTRL_REG,
 253                 (AB8500_BIT_WD_CTRL_ENABLE
 254                 | AB8500_BIT_WD_CTRL_KICK));
 255
 256         udelay(AB8500_WD_V11_DISABLE_DELAY_US);
 257
 258         abx500_set_register_interruptible(ab->dev,
 259                 AB8500_SYS_CTRL2_BLOCK,
 260                 AB8500_MAIN_WD_CTRL_REG,
 261                 0);
 262 }
 263
 264 static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
 265 {
 266         int ret, volt;
 267
 268         ret = regulator_enable(ab->v_ape);
 269         if (ret)
 270                 dev_err(ab->dev, "Failed to enable v-ape\n");
 271
 272         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 273                 ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
 274                 if (ab->saved_v_ulpi < 0)
 275                         dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
 276
 277                 ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
 278                 if (ret < 0)
 279                         dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
 280                                         ret);
 281
 282                 ret = regulator_set_optimum_mode(ab->v_ulpi, 28000);
 283                 if (ret < 0)
 284                         dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
 285                                         ret);
 286         }
 287
 288         ret = regulator_enable(ab->v_ulpi);
 289         if (ret)
 290                 dev_err(ab->dev, "Failed to enable vddulpivio18\n");
 291
 292         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 293                 volt = regulator_get_voltage(ab->v_ulpi);
 294                 if ((volt != 1300000) && (volt != 1350000))
 295                         dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
 296                                         volt);
 297         }
 298
 299         ret = regulator_enable(ab->v_musb);
 300         if (ret)
 301                 dev_err(ab->dev, "Failed to enable musb_1v8\n");
 302 }
 303
 304 static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
 305 {
 306         int ret;
 307
 308         regulator_disable(ab->v_musb);
 309
 310         regulator_disable(ab->v_ulpi);
 311
 312         /* USB is not the only consumer of Vintcore, restore old settings */
 313         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 314                 if (ab->saved_v_ulpi > 0) {
 315                         ret = regulator_set_voltage(ab->v_ulpi,
 316                                         ab->saved_v_ulpi, ab->saved_v_ulpi);
 317                         if (ret < 0)
 318                                 dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
 319                                                 ab->saved_v_ulpi, ret);
 320                 }
 321
 322                 ret = regulator_set_optimum_mode(ab->v_ulpi, 0);
 323                 if (ret < 0)
 324                         dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
 325                                         ret);
 326         }
 327
 328         regulator_disable(ab->v_ape);
 329 }
 330
 331 static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
 332 {
 333         /* Workaround for v2.0 bug # 31952 */
 334         if (is_ab8500_2p0(ab->ab8500)) {
 335                 abx500_mask_and_set_register_interruptible(ab->dev,
 336                                 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 337                                 bit, bit);
 338                 udelay(AB8500_V20_31952_DISABLE_DELAY_US);
 339         }
 340 }
 341
 342 static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
 343 {
 344         u8 bit;
 345         bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
 346                 AB8500_BIT_PHY_CTRL_DEVICE_EN;
 347
 348         /* mux and configure USB pins to DEFAULT state */
 349         ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
 350         if (IS_ERR(ab->pinctrl))
 351                 dev_err(ab->dev, "could not get/set default pinstate\n");
 352
 353         if (clk_prepare_enable(ab->sysclk))
 354                 dev_err(ab->dev, "can't prepare/enable clock\n");
 355
 356         ab8500_usb_regulator_enable(ab);
 357
 358         abx500_mask_and_set_register_interruptible(ab->dev,
 359                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 360                         bit, bit);
 361
 362         if (ab->flags & AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK) {
 363                 if (sel_host)
 364                         abx500_set_register_interruptible(ab->dev,
 365                                         AB8500_USB, AB8540_USB_OTG_CTL_REG,
 366                                         AB8540_BIT_OTG_CTL_VBUS_VALID_ENA |
 367                                         AB8540_BIT_OTG_CTL_ID_HOST_ENA |
 368                                         AB8540_BIT_OTG_CTL_ID_DEV_ENA);
 369         }
 370 }
 371
 372 static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
 373 {
 374         u8 bit;
 375         bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
 376                 AB8500_BIT_PHY_CTRL_DEVICE_EN;
 377
 378         ab8500_usb_wd_linkstatus(ab, bit);
 379
 380         abx500_mask_and_set_register_interruptible(ab->dev,
 381                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 382                         bit, 0);
 383
 384         /* Needed to disable the phy.*/
 385         ab8500_usb_wd_workaround(ab);
 386
 387         clk_disable_unprepare(ab->sysclk);
 388
 389         ab8500_usb_regulator_disable(ab);
 390
 391         if (!IS_ERR(ab->pinctrl)) {
 392                 /* configure USB pins to SLEEP state */
 393                 ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
 394                                 PINCTRL_STATE_SLEEP);
 395
 396                 if (IS_ERR(ab->pins_sleep))
 397                         dev_dbg(ab->dev, "could not get sleep pinstate\n");
 398                 else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
 399                         dev_err(ab->dev, "could not set pins to sleep state\n");
 400
 401                 /*
 402                  * as USB pins are shared with iddet, release them to allow
 403                  * iddet to request them
 404                  */
 405                 pinctrl_put(ab->pinctrl);
 406         }
 407 }
 408
 409 #define ab8500_usb_host_phy_en(ab)      ab8500_usb_phy_enable(ab, true)
 410 #define ab8500_usb_host_phy_dis(ab)     ab8500_usb_phy_disable(ab, true)
 411 #define ab8500_usb_peri_phy_en(ab)      ab8500_usb_phy_enable(ab, false)
 412 #define ab8500_usb_peri_phy_dis(ab)     ab8500_usb_phy_disable(ab, false)
 413
 414 static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 415                 enum ab9540_usb_link_status lsts)
 416 {
 417         enum ux500_musb_vbus_id_status event = 0;
 418
 419         dev_dbg(ab->dev, "ab9540_usb_link_status_update %d\n", lsts);
 420
 421         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_9540 &&
 422                         (lsts == USB_LINK_STD_HOST_C_NS_9540 ||
 423                          lsts == USB_LINK_STD_HOST_NC_9540))
 424                 return 0;
 425
 426         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_9540 &&
 427                         (lsts == USB_LINK_STD_HOST_NC_9540))
 428                 return 0;
 429
 430         ab->previous_link_status_state = lsts;
 431
 432         switch (lsts) {
 433         case USB_LINK_ACA_RID_B_9540:
 434                 event = UX500_MUSB_RIDB;
 435         case USB_LINK_NOT_CONFIGURED_9540:
 436         case USB_LINK_RESERVED0_9540:
 437         case USB_LINK_RESERVED1_9540:
 438         case USB_LINK_RESERVED2_9540:
 439         case USB_LINK_RESERVED3_9540:
 440                 if (ab->mode == USB_PERIPHERAL)
 441                         atomic_notifier_call_chain(&ab->phy.notifier,
 442                                         UX500_MUSB_CLEAN, &ab->vbus_draw);
 443                 ab->mode = USB_IDLE;
 444                 ab->phy.otg->default_a = false;
 445                 ab->vbus_draw = 0;
 446                 if (event != UX500_MUSB_RIDB)
 447                         event = UX500_MUSB_NONE;
 448                 /* Fallback to default B_IDLE as nothing is connected. */
 449                 ab->phy.state = OTG_STATE_B_IDLE;
 450                 break;
 451
 452         case USB_LINK_ACA_RID_C_NM_9540:
 453                 event = UX500_MUSB_RIDC;
 454         case USB_LINK_STD_HOST_NC_9540:
 455         case USB_LINK_STD_HOST_C_NS_9540:
 456         case USB_LINK_STD_HOST_C_S_9540:
 457         case USB_LINK_CDP_9540:
 458                 if (ab->mode == USB_HOST) {
 459                         ab->mode = USB_PERIPHERAL;
 460                         ab8500_usb_host_phy_dis(ab);
 461                         ab8500_usb_peri_phy_en(ab);
 462                         atomic_notifier_call_chain(&ab->phy.notifier,
 463                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 464                 }
 465                 if (ab->mode == USB_IDLE) {
 466                         ab->mode = USB_PERIPHERAL;
 467                         ab8500_usb_peri_phy_en(ab);
 468                         atomic_notifier_call_chain(&ab->phy.notifier,
 469                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 470                 }
 471                 if (event != UX500_MUSB_RIDC)
 472                         event = UX500_MUSB_VBUS;
 473                 break;
 474
 475         case USB_LINK_ACA_RID_A_9540:
 476                 event = UX500_MUSB_RIDA;
 477         case USB_LINK_HM_IDGND_9540:
 478         case USB_LINK_STD_UPSTREAM_9540:
 479                 if (ab->mode == USB_PERIPHERAL) {
 480                         ab->mode = USB_HOST;
 481                         ab8500_usb_peri_phy_dis(ab);
 482                         ab8500_usb_host_phy_en(ab);
 483                         atomic_notifier_call_chain(&ab->phy.notifier,
 484                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 485                 }
 486                 if (ab->mode == USB_IDLE) {
 487                         ab->mode = USB_HOST;
 488                         ab8500_usb_host_phy_en(ab);
 489                         atomic_notifier_call_chain(&ab->phy.notifier,
 490                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 491                 }
 492                 ab->phy.otg->default_a = true;
 493                 if (event != UX500_MUSB_RIDA)
 494                         event = UX500_MUSB_ID;
 495
 496                 atomic_notifier_call_chain(&ab->phy.notifier,
 497                                 event, &ab->vbus_draw);
 498                 break;
 499
 500         case USB_LINK_DEDICATED_CHG_9540:
 501                 ab->mode = USB_DEDICATED_CHG;
 502                 event = UX500_MUSB_CHARGER;
 503                 atomic_notifier_call_chain(&ab->phy.notifier,
 504                                 event, &ab->vbus_draw);
 505                 break;
 506
 507         case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540:
 508         case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540:
 509                 if (!(is_ab9540_2p0_or_earlier(ab->ab8500))) {
 510                         event = UX500_MUSB_NONE;
 511                         if (ab->mode == USB_HOST) {
 512                                 ab->phy.otg->default_a = false;
 513                                 ab->vbus_draw = 0;
 514                                 atomic_notifier_call_chain(&ab->phy.notifier,
 515                                                 event, &ab->vbus_draw);
 516                                 ab8500_usb_host_phy_dis(ab);
 517                                 ab->mode = USB_IDLE;
 518                         }
 519                         if (ab->mode == USB_PERIPHERAL) {
 520                                 atomic_notifier_call_chain(&ab->phy.notifier,
 521                                                 event, &ab->vbus_draw);
 522                                 ab8500_usb_peri_phy_dis(ab);
 523                                 atomic_notifier_call_chain(&ab->phy.notifier,
 524                                                 UX500_MUSB_CLEAN,
 525                                                 &ab->vbus_draw);
 526                                 ab->mode = USB_IDLE;
 527                                 ab->phy.otg->default_a = false;
 528                                 ab->vbus_draw = 0;
 529                         }
 530                 }
 531                 break;
 532
 533         default:
 534                 break;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 541                 enum ab8540_usb_link_status lsts)
 542 {
 543         enum ux500_musb_vbus_id_status event = 0;
 544
 545         dev_dbg(ab->dev, "ab8540_usb_link_status_update %d\n", lsts);
 546
 547         if (ab->enabled_charging_detection) {
 548                 /* Disable USB Charger detection */
 549                 abx500_mask_and_set_register_interruptible(ab->dev,
 550                                 AB8500_USB, AB8540_VBUS_CTRL_REG,
 551                                 AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA, 0x00);
 552                 ab->enabled_charging_detection = false;
 553         }
 554
 555         /*
 556          * Spurious link_status interrupts are seen in case of a
 557          * disconnection of a device in IDGND and RIDA stage
 558          */
 559         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8540 &&
 560                         (lsts == USB_LINK_STD_HOST_C_NS_8540 ||
 561                          lsts == USB_LINK_STD_HOST_NC_8540))
 562                 return 0;
 563
 564         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8540 &&
 565                         (lsts == USB_LINK_STD_HOST_NC_8540))
 566                 return 0;
 567
 568         ab->previous_link_status_state = lsts;
 569
 570         switch (lsts) {
 571         case USB_LINK_ACA_RID_B_8540:
 572                 event = UX500_MUSB_RIDB;
 573         case USB_LINK_NOT_CONFIGURED_8540:
 574         case USB_LINK_RESERVED0_8540:
 575         case USB_LINK_RESERVED1_8540:
 576         case USB_LINK_RESERVED2_8540:
 577         case USB_LINK_RESERVED3_8540:
 578                 ab->mode = USB_IDLE;
 579                 ab->phy.otg->default_a = false;
 580                 ab->vbus_draw = 0;
 581                 if (event != UX500_MUSB_RIDB)
 582                         event = UX500_MUSB_NONE;
 583                 /*
 584                  * Fallback to default B_IDLE as nothing
 585                  * is connected
 586                  */
 587                 ab->phy.state = OTG_STATE_B_IDLE;
 588                 break;
 589
 590         case USB_LINK_ACA_RID_C_NM_8540:
 591                 event = UX500_MUSB_RIDC;
 592         case USB_LINK_STD_HOST_NC_8540:
 593         case USB_LINK_STD_HOST_C_NS_8540:
 594         case USB_LINK_STD_HOST_C_S_8540:
 595         case USB_LINK_CDP_8540:
 596                 if (ab->mode == USB_IDLE) {
 597                         ab->mode = USB_PERIPHERAL;
 598                         ab8500_usb_peri_phy_en(ab);
 599                         atomic_notifier_call_chain(&ab->phy.notifier,
 600                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 601                 }
 602                 if (event != UX500_MUSB_RIDC)
 603                         event = UX500_MUSB_VBUS;
 604                 break;
 605
 606         case USB_LINK_ACA_RID_A_8540:
 607         case USB_LINK_ACA_DOCK_CHGR_8540:
 608                 event = UX500_MUSB_RIDA;
 609         case USB_LINK_HM_IDGND_8540:
 610         case USB_LINK_STD_UPSTREAM_8540:
 611                 if (ab->mode == USB_IDLE) {
 612                         ab->mode = USB_HOST;
 613                         ab8500_usb_host_phy_en(ab);
 614                         atomic_notifier_call_chain(&ab->phy.notifier,
 615                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 616                 }
 617                 ab->phy.otg->default_a = true;
 618                 if (event != UX500_MUSB_RIDA)
 619                         event = UX500_MUSB_ID;
 620                 atomic_notifier_call_chain(&ab->phy.notifier,
 621                                 event, &ab->vbus_draw);
 622                 break;
 623
 624         case USB_LINK_DEDICATED_CHG_8540:
 625                 ab->mode = USB_DEDICATED_CHG;
 626                 event = UX500_MUSB_CHARGER;
 627                 atomic_notifier_call_chain(&ab->phy.notifier,
 628                                 event, &ab->vbus_draw);
 629                 break;
 630
 631         case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540:
 632         case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540:
 633                 event = UX500_MUSB_NONE;
 634                 if (ab->mode == USB_HOST) {
 635                         ab->phy.otg->default_a = false;
 636                         ab->vbus_draw = 0;
 637                         atomic_notifier_call_chain(&ab->phy.notifier,
 638                                         event, &ab->vbus_draw);
 639                         ab8500_usb_host_phy_dis(ab);
 640                         ab->mode = USB_IDLE;
 641                 }
 642                 if (ab->mode == USB_PERIPHERAL) {
 643                         atomic_notifier_call_chain(&ab->phy.notifier,
 644                                         event, &ab->vbus_draw);
 645                         ab8500_usb_peri_phy_dis(ab);
 646                         atomic_notifier_call_chain(&ab->phy.notifier,
 647                                         UX500_MUSB_CLEAN, &ab->vbus_draw);
 648                         ab->mode = USB_IDLE;
 649                         ab->phy.otg->default_a = false;
 650                         ab->vbus_draw = 0;
 651                 }
 652                 break;
 653
 654         default:
 655                 event = UX500_MUSB_NONE;
 656                 break;
 657         }
 658
 659         return 0;
 660 }
 661
 662 static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 663                 enum ab8505_usb_link_status lsts)
 664 {
 665         enum ux500_musb_vbus_id_status event = 0;
 666
 667         dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
 668
 669         /*
 670          * Spurious link_status interrupts are seen at the time of
 671          * disconnection of a device in RIDA state
 672          */
 673         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
 674                         (lsts == USB_LINK_STD_HOST_NC_8505))
 675                 return 0;
 676
 677         ab->previous_link_status_state = lsts;
 678
 679         switch (lsts) {
 680         case USB_LINK_ACA_RID_B_8505:
 681                 event = UX500_MUSB_RIDB;
 682         case USB_LINK_NOT_CONFIGURED_8505:
 683         case USB_LINK_RESERVED0_8505:
 684         case USB_LINK_RESERVED1_8505:
 685         case USB_LINK_RESERVED2_8505:
 686         case USB_LINK_RESERVED3_8505:
 687                 ab->mode = USB_IDLE;
 688                 ab->phy.otg->default_a = false;
 689                 ab->vbus_draw = 0;
 690                 if (event != UX500_MUSB_RIDB)
 691                         event = UX500_MUSB_NONE;
 692                 /*
 693                  * Fallback to default B_IDLE as nothing
 694                  * is connected
 695                  */
 696                 ab->phy.state = OTG_STATE_B_IDLE;
 697                 break;
 698
 699         case USB_LINK_ACA_RID_C_NM_8505:
 700                 event = UX500_MUSB_RIDC;
 701         case USB_LINK_STD_HOST_NC_8505:
 702         case USB_LINK_STD_HOST_C_NS_8505:
 703         case USB_LINK_STD_HOST_C_S_8505:
 704         case USB_LINK_CDP_8505:
 705                 if (ab->mode == USB_IDLE) {
 706                         ab->mode = USB_PERIPHERAL;
 707                         ab8500_usb_peri_phy_en(ab);
 708                         atomic_notifier_call_chain(&ab->phy.notifier,
 709                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 710                 }
 711                 if (event != UX500_MUSB_RIDC)
 712                         event = UX500_MUSB_VBUS;
 713                 break;
 714
 715         case USB_LINK_ACA_RID_A_8505:
 716         case USB_LINK_ACA_DOCK_CHGR_8505:
 717                 event = UX500_MUSB_RIDA;
 718         case USB_LINK_HM_IDGND_8505:
 719                 if (ab->mode == USB_IDLE) {
 720                         ab->mode = USB_HOST;
 721                         ab8500_usb_host_phy_en(ab);
 722                         atomic_notifier_call_chain(&ab->phy.notifier,
 723                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 724                 }
 725                 ab->phy.otg->default_a = true;
 726                 if (event != UX500_MUSB_RIDA)
 727                         event = UX500_MUSB_ID;
 728                 atomic_notifier_call_chain(&ab->phy.notifier,
 729                                 event, &ab->vbus_draw);
 730                 break;
 731
 732         case USB_LINK_DEDICATED_CHG_8505:
 733                 ab->mode = USB_DEDICATED_CHG;
 734                 event = UX500_MUSB_CHARGER;
 735                 atomic_notifier_call_chain(&ab->phy.notifier,
 736                                 event, &ab->vbus_draw);
 737                 break;
 738
 739         default:
 740                 break;
 741         }
 742
 743         return 0;
 744 }
 745
 746 static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 747                 enum ab8500_usb_link_status lsts)
 748 {
 749         enum ux500_musb_vbus_id_status event = 0;
 750
 751         dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
 752
 753         /*
 754          * Spurious link_status interrupts are seen in case of a
 755          * disconnection of a device in IDGND and RIDA stage
 756          */
 757         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
 758                         (lsts == USB_LINK_STD_HOST_C_NS_8500 ||
 759                          lsts == USB_LINK_STD_HOST_NC_8500))
 760                 return 0;
 761
 762         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
 763                         lsts == USB_LINK_STD_HOST_NC_8500)
 764                 return 0;
 765
 766         ab->previous_link_status_state = lsts;
 767
 768         switch (lsts) {
 769         case USB_LINK_ACA_RID_B_8500:
 770                 event = UX500_MUSB_RIDB;
 771         case USB_LINK_NOT_CONFIGURED_8500:
 772         case USB_LINK_NOT_VALID_LINK_8500:
 773                 ab->mode = USB_IDLE;
 774                 ab->phy.otg->default_a = false;
 775                 ab->vbus_draw = 0;
 776                 if (event != UX500_MUSB_RIDB)
 777                         event = UX500_MUSB_NONE;
 778                 /* Fallback to default B_IDLE as nothing is connected */
 779                 ab->phy.state = OTG_STATE_B_IDLE;
 780                 break;
 781
 782         case USB_LINK_ACA_RID_C_NM_8500:
 783         case USB_LINK_ACA_RID_C_HS_8500:
 784         case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
 785                 event = UX500_MUSB_RIDC;
 786         case USB_LINK_STD_HOST_NC_8500:
 787         case USB_LINK_STD_HOST_C_NS_8500:
 788         case USB_LINK_STD_HOST_C_S_8500:
 789         case USB_LINK_HOST_CHG_NM_8500:
 790         case USB_LINK_HOST_CHG_HS_8500:
 791         case USB_LINK_HOST_CHG_HS_CHIRP_8500:
 792                 if (ab->mode == USB_IDLE) {
 793                         ab->mode = USB_PERIPHERAL;
 794                         ab8500_usb_peri_phy_en(ab);
 795                         atomic_notifier_call_chain(&ab->phy.notifier,
 796                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 797                 }
 798                 if (event != UX500_MUSB_RIDC)
 799                         event = UX500_MUSB_VBUS;
 800                 break;
 801
 802         case USB_LINK_ACA_RID_A_8500:
 803                 event = UX500_MUSB_RIDA;
 804         case USB_LINK_HM_IDGND_8500:
 805                 if (ab->mode == USB_IDLE) {
 806                         ab->mode = USB_HOST;
 807                         ab8500_usb_host_phy_en(ab);
 808                         atomic_notifier_call_chain(&ab->phy.notifier,
 809                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 810                 }
 811                 ab->phy.otg->default_a = true;
 812                 if (event != UX500_MUSB_RIDA)
 813                         event = UX500_MUSB_ID;
 814                 atomic_notifier_call_chain(&ab->phy.notifier,
 815                                 event, &ab->vbus_draw);
 816                 break;
 817
 818         case USB_LINK_DEDICATED_CHG_8500:
 819                 ab->mode = USB_DEDICATED_CHG;
 820                 event = UX500_MUSB_CHARGER;
 821                 atomic_notifier_call_chain(&ab->phy.notifier,
 822                                 event, &ab->vbus_draw);
 823                 break;
 824
 825         case USB_LINK_RESERVED_8500:
 826                 break;
 827         }
 828
 829         return 0;
 830 }
 831
 832 /*
 833  * Connection Sequence:
 834  *   1. Link Status Interrupt
 835  *   2. Enable AB clock
 836  *   3. Enable AB regulators
 837  *   4. Enable USB phy
 838  *   5. Reset the musb controller
 839  *   6. Switch the ULPI GPIO pins to fucntion mode
 840  *   7. Enable the musb Peripheral5 clock
 841  *   8. Restore MUSB context
 842  */
 843 static int abx500_usb_link_status_update(struct ab8500_usb *ab)
 844 {
 845         u8 reg;
 846         int ret = 0;
 847
 848         if (is_ab8500(ab->ab8500)) {
 849                 enum ab8500_usb_link_status lsts;
 850
 851                 abx500_get_register_interruptible(ab->dev,
 852                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &reg);
 853                 lsts = (reg >> 3) & 0x0F;
 854                 ret = ab8500_usb_link_status_update(ab, lsts);
 855         } else if (is_ab8505(ab->ab8500)) {
 856                 enum ab8505_usb_link_status lsts;
 857
 858                 abx500_get_register_interruptible(ab->dev,
 859                                 AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
 860                 lsts = (reg >> 3) & 0x1F;
 861                 ret = ab8505_usb_link_status_update(ab, lsts);
 862         } else if (is_ab8540(ab->ab8500)) {
 863                 enum ab8540_usb_link_status lsts;
 864
 865                 abx500_get_register_interruptible(ab->dev,
 866                                 AB8500_USB, AB8540_USB_LINK_STAT_REG, &reg);
 867                 lsts = (reg >> 3) & 0xFF;
 868                 ret = ab8540_usb_link_status_update(ab, lsts);
 869         } else if (is_ab9540(ab->ab8500)) {
 870                 enum ab9540_usb_link_status lsts;
 871
 872                 abx500_get_register_interruptible(ab->dev,
 873                                 AB8500_USB, AB9540_USB_LINK_STAT_REG, &reg);
 874                 lsts = (reg >> 3) & 0xFF;
 875                 ret = ab9540_usb_link_status_update(ab, lsts);
 876         }
 877
 878         return ret;
 879 }
 880
 881 /*
 882  * Disconnection Sequence:
 883  *   1. Disconect Interrupt
 884  *   2. Disable regulators
 885  *   3. Disable AB clock
 886  *   4. Disable the Phy
 887  *   5. Link Status Interrupt
 888  *   6. Disable Musb Clock
 889  */
 890 static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
 891 {
 892         struct ab8500_usb *ab = (struct ab8500_usb *) data;
 893         enum usb_phy_events event = UX500_MUSB_NONE;
 894
 895         /* Link status will not be updated till phy is disabled. */
 896         if (ab->mode == USB_HOST) {
 897                 ab->phy.otg->default_a = false;
 898                 ab->vbus_draw = 0;
 899                 atomic_notifier_call_chain(&ab->phy.notifier,
 900                                 event, &ab->vbus_draw);
 901                 ab8500_usb_host_phy_dis(ab);
 902                 ab->mode = USB_IDLE;
 903         }
 904
 905         if (ab->mode == USB_PERIPHERAL) {
 906                 atomic_notifier_call_chain(&ab->phy.notifier,
 907                                 event, &ab->vbus_draw);
 908                 ab8500_usb_peri_phy_dis(ab);
 909                 atomic_notifier_call_chain(&ab->phy.notifier,
 910                                 UX500_MUSB_CLEAN, &ab->vbus_draw);
 911                 ab->mode = USB_IDLE;
 912                 ab->phy.otg->default_a = false;
 913                 ab->vbus_draw = 0;
 914         }
 915
 916         if (is_ab8500_2p0(ab->ab8500)) {
 917                 if (ab->mode == USB_DEDICATED_CHG) {
 918                         ab8500_usb_wd_linkstatus(ab,
 919                                         AB8500_BIT_PHY_CTRL_DEVICE_EN);
 920                         abx500_mask_and_set_register_interruptible(ab->dev,
 921                                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 922                                         AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
 923                 }
 924         }
 925
 926         return IRQ_HANDLED;
 927 }
 928
 929 static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
 930 {
 931         struct ab8500_usb *ab = (struct ab8500_usb *)data;
 932
 933         abx500_usb_link_status_update(ab);
 934
 935         return IRQ_HANDLED;
 936 }
 937
 938 static void ab8500_usb_phy_disable_work(struct work_struct *work)
 939 {
 940         struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
 941                                                 phy_dis_work);
 942
 943         if (!ab->phy.otg->host)
 944                 ab8500_usb_host_phy_dis(ab);
 945
 946         if (!ab->phy.otg->gadget)
 947                 ab8500_usb_peri_phy_dis(ab);
 948 }
 949
 950 /* Check if VBUS is set and linkstatus has not detected a cable. */
 951 static bool ab8500_usb_check_vbus_status(struct ab8500_usb *ab)
 952 {
 953         u8 isource2;
 954         u8 reg;
 955         enum ab8540_usb_link_status lsts;
 956
 957         abx500_get_register_interruptible(ab->dev,
 958                         AB8500_INTERRUPT, AB8500_IT_SOURCE2_REG,
 959                         &isource2);
 960
 961         /* If Vbus is below 3.6V abort */
 962         if (!(isource2 & AB8500_BIT_SOURCE2_VBUSDET))
 963                 return false;
 964
 965         abx500_get_register_interruptible(ab->dev,
 966                         AB8500_USB, AB8540_USB_LINK_STAT_REG,
 967                         &reg);
 968
 969         lsts = (reg >> 3) & 0xFF;
 970
 971         /* Check if linkstatus has detected a cable */
 972         if (lsts)
 973                 return false;
 974
 975         return true;
 976 }
 977
 978 /* re-trigger charger detection again with watchdog re-kick. */
 979 static void ab8500_usb_vbus_turn_on_event_work(struct work_struct *work)
 980 {
 981         struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
 982                         vbus_event_work);
 983
 984         if (ab->mode != USB_IDLE)
 985                 return;
 986
 987         abx500_set_register_interruptible(ab->dev,
 988                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
 989                         AB8500_BIT_WD_CTRL_ENABLE);
 990
 991         udelay(100);
 992
 993         abx500_set_register_interruptible(ab->dev,
 994                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
 995                         AB8500_BIT_WD_CTRL_ENABLE | AB8500_BIT_WD_CTRL_KICK);
 996
 997         udelay(100);
 998
 999         /* Disable Main watchdog */
1000         abx500_set_register_interruptible(ab->dev,
1001                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1002                         0x0);
1003
1004         /* Enable USB Charger detection */
1005         abx500_mask_and_set_register_interruptible(ab->dev,
1006                         AB8500_USB, AB8540_VBUS_CTRL_REG,
1007                         AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA,
1008                         AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA);
1009
1010         ab->enabled_charging_detection = true;
1011 }
1012
1013 static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
1014 {
1015         /*
1016          * AB8500 V2 has eye diagram issues when drawing more than 100mA from
1017          * VBUS.  Set charging current to 100mA in case of standard host
1018          */
1019         if (is_ab8500_2p0_or_earlier(ab->ab8500))
1020                 if (mA > 100)
1021                         mA = 100;
1022
1023         return mA;
1024 }
1025
1026 static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
1027 {
1028         struct ab8500_usb *ab;
1029
1030         if (!phy)
1031                 return -ENODEV;
1032
1033         ab = phy_to_ab(phy);
1034
1035         mA = ab8500_eyediagram_workaroud(ab, mA);
1036
1037         ab->vbus_draw = mA;
1038
1039         atomic_notifier_call_chain(&ab->phy.notifier,
1040                         UX500_MUSB_VBUS, &ab->vbus_draw);
1041
1042         return 0;
1043 }
1044
1045 static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
1046 {
1047         /* TODO */
1048         return 0;
1049 }
1050
1051 static int ab8500_usb_set_peripheral(struct usb_otg *otg,
1052                                         struct usb_gadget *gadget)
1053 {
1054         struct ab8500_usb *ab;
1055
1056         if (!otg)
1057                 return -ENODEV;
1058
1059         ab = phy_to_ab(otg->phy);
1060
1061         ab->phy.otg->gadget = gadget;
1062
1063         /* Some drivers call this function in atomic context.
1064          * Do not update ab8500 registers directly till this
1065          * is fixed.
1066          */
1067
1068         if ((ab->mode != USB_IDLE) && !gadget) {
1069                 ab->mode = USB_IDLE;
1070                 schedule_work(&ab->phy_dis_work);
1071         }
1072
1073         return 0;
1074 }
1075
1076 static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
1077 {
1078         struct ab8500_usb *ab;
1079
1080         if (!otg)
1081                 return -ENODEV;
1082
1083         ab = phy_to_ab(otg->phy);
1084
1085         ab->phy.otg->host = host;
1086
1087         /* Some drivers call this function in atomic context.
1088          * Do not update ab8500 registers directly till this
1089          * is fixed.
1090          */
1091
1092         if ((ab->mode != USB_IDLE) && !host) {
1093                 ab->mode = USB_IDLE;
1094                 schedule_work(&ab->phy_dis_work);
1095         }
1096
1097         return 0;
1098 }
1099
1100 static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
1101 {
1102         abx500_mask_and_set_register_interruptible(ab->dev,
1103                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1104                         AB8500_BIT_PHY_CTRL_DEVICE_EN,
1105                         AB8500_BIT_PHY_CTRL_DEVICE_EN);
1106
1107         udelay(100);
1108
1109         abx500_mask_and_set_register_interruptible(ab->dev,
1110                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1111                         AB8500_BIT_PHY_CTRL_DEVICE_EN,
1112                         0);
1113
1114         abx500_mask_and_set_register_interruptible(ab->dev,
1115                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1116                         AB8500_BIT_PHY_CTRL_HOST_EN,
1117                         AB8500_BIT_PHY_CTRL_HOST_EN);
1118
1119         udelay(100);
1120
1121         abx500_mask_and_set_register_interruptible(ab->dev,
1122                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1123                         AB8500_BIT_PHY_CTRL_HOST_EN,
1124                         0);
1125 }
1126
1127 static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
1128 {
1129         int err;
1130
1131         ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
1132         if (IS_ERR(ab->v_ape)) {
1133                 dev_err(ab->dev, "Could not get v-ape supply\n");
1134                 err = PTR_ERR(ab->v_ape);
1135                 return err;
1136         }
1137
1138         ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
1139         if (IS_ERR(ab->v_ulpi)) {
1140                 dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
1141                 err = PTR_ERR(ab->v_ulpi);
1142                 return err;
1143         }
1144
1145         ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
1146         if (IS_ERR(ab->v_musb)) {
1147                 dev_err(ab->dev, "Could not get musb_1v8 supply\n");
1148                 err = PTR_ERR(ab->v_musb);
1149                 return err;
1150         }
1151
1152         return 0;
1153 }
1154
1155 static int ab8500_usb_irq_setup(struct platform_device *pdev,
1156                 struct ab8500_usb *ab)
1157 {
1158         int err;
1159         int irq;
1160
1161         if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
1162                 irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
1163                 if (irq < 0) {
1164                         dev_err(&pdev->dev, "Link status irq not found\n");
1165                         return irq;
1166                 }
1167                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1168                                 ab8500_usb_link_status_irq,
1169                                 IRQF_NO_SUSPEND | IRQF_SHARED,
1170                                 "usb-link-status", ab);
1171                 if (err < 0) {
1172                         dev_err(ab->dev, "request_irq failed for link status irq\n");
1173                         return err;
1174                 }
1175         }
1176
1177         if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
1178                 irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
1179                 if (irq < 0) {
1180                         dev_err(&pdev->dev, "ID fall irq not found\n");
1181                         return irq;
1182                 }
1183                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1184                                 ab8500_usb_disconnect_irq,
1185                                 IRQF_NO_SUSPEND | IRQF_SHARED,
1186                                 "usb-id-fall", ab);
1187                 if (err < 0) {
1188                         dev_err(ab->dev, "request_irq failed for ID fall irq\n");
1189                         return err;
1190                 }
1191         }
1192
1193         if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
1194                 irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
1195                 if (irq < 0) {
1196                         dev_err(&pdev->dev, "VBUS fall irq not found\n");
1197                         return irq;
1198                 }
1199                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1200                                 ab8500_usb_disconnect_irq,
1201                                 IRQF_NO_SUSPEND | IRQF_SHARED,
1202                                 "usb-vbus-fall", ab);
1203                 if (err < 0) {
1204                         dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
1205                         return err;
1206                 }
1207         }
1208
1209         return 0;
1210 }
1211
1212 static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
1213 {
1214         int err;
1215
1216         /* Enable the PBT/Bank 0x12 access */
1217         err = abx500_set_register_interruptible(ab->dev,
1218                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1219         if (err < 0)
1220                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1221                                 err);
1222
1223         err = abx500_set_register_interruptible(ab->dev,
1224                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1225         if (err < 0)
1226                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1227                                 err);
1228
1229         err = abx500_set_register_interruptible(ab->dev,
1230                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
1231         if (err < 0)
1232                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1233                                 err);
1234
1235         err = abx500_set_register_interruptible(ab->dev,
1236                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
1237         if (err < 0)
1238                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1239                                 err);
1240
1241         /* Switch to normal mode/disable Bank 0x12 access */
1242         err = abx500_set_register_interruptible(ab->dev,
1243                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1244         if (err < 0)
1245                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1246                                 err);
1247 }
1248
1249 static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
1250 {
1251         int err;
1252
1253         /* Enable the PBT/Bank 0x12 access */
1254         err = abx500_mask_and_set_register_interruptible(ab->dev,
1255                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1256                         0x01, 0x01);
1257         if (err < 0)
1258                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1259                                 err);
1260
1261         err = abx500_mask_and_set_register_interruptible(ab->dev,
1262                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
1263                         0xC8, 0xC8);
1264         if (err < 0)
1265                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1266                                 err);
1267
1268         err = abx500_mask_and_set_register_interruptible(ab->dev,
1269                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
1270                         0x60, 0x60);
1271         if (err < 0)
1272                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1273                                 err);
1274
1275         err = abx500_mask_and_set_register_interruptible(ab->dev,
1276                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
1277                         0xFC, 0x80);
1278
1279         if (err < 0)
1280                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1281                                 err);
1282
1283         /* Switch to normal mode/disable Bank 0x12 access */
1284         err = abx500_mask_and_set_register_interruptible(ab->dev,
1285                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1286                         0x00, 0x00);
1287         if (err < 0)
1288                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1289                                 err);
1290 }
1291
1292 static void ab8500_usb_set_ab8540_tuning_values(struct ab8500_usb *ab)
1293 {
1294         int err;
1295
1296         err = abx500_set_register_interruptible(ab->dev,
1297                         AB8540_DEBUG, AB8500_USB_PHY_TUNE1, 0xCC);
1298         if (err < 0)
1299                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register ret=%d\n",
1300                                 err);
1301
1302         err = abx500_set_register_interruptible(ab->dev,
1303                         AB8540_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1304         if (err < 0)
1305                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register ret=%d\n",
1306                                 err);
1307
1308         err = abx500_set_register_interruptible(ab->dev,
1309                         AB8540_DEBUG, AB8500_USB_PHY_TUNE3, 0x90);
1310         if (err < 0)
1311                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester ret=%d\n",
1312                                 err);
1313 }
1314
1315 static void ab8500_usb_set_ab9540_tuning_values(struct ab8500_usb *ab)
1316 {
1317         int err;
1318
1319         /* Enable the PBT/Bank 0x12 access */
1320         err = abx500_set_register_interruptible(ab->dev,
1321                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1322         if (err < 0)
1323                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1324                                 err);
1325
1326         err = abx500_set_register_interruptible(ab->dev,
1327                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1328         if (err < 0)
1329                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1330                                 err);
1331
1332         err = abx500_set_register_interruptible(ab->dev,
1333                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1334         if (err < 0)
1335                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1336                                 err);
1337
1338         err = abx500_set_register_interruptible(ab->dev,
1339                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x80);
1340         if (err < 0)
1341                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1342                                 err);
1343
1344         /* Switch to normal mode/disable Bank 0x12 access */
1345         err = abx500_set_register_interruptible(ab->dev,
1346                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1347         if (err < 0)
1348                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1349                                 err);
1350 }
1351
1352 static int ab8500_usb_probe(struct platform_device *pdev)
1353 {
1354         struct ab8500_usb       *ab;
1355         struct ab8500           *ab8500;
1356         struct usb_otg          *otg;
1357         int err;
1358         int rev;
1359
1360         ab8500 = dev_get_drvdata(pdev->dev.parent);
1361         rev = abx500_get_chip_id(&pdev->dev);
1362
1363         if (is_ab8500_1p1_or_earlier(ab8500)) {
1364                 dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
1365                 return -ENODEV;
1366         }
1367
1368         ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
1369         if (!ab)
1370                 return -ENOMEM;
1371
1372         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
1373         if (!otg)
1374                 return -ENOMEM;
1375
1376         ab->dev                 = &pdev->dev;
1377         ab->ab8500              = ab8500;
1378         ab->phy.dev             = ab->dev;
1379         ab->phy.otg             = otg;
1380         ab->phy.label           = "ab8500";
1381         ab->phy.set_suspend     = ab8500_usb_set_suspend;
1382         ab->phy.set_power       = ab8500_usb_set_power;
1383         ab->phy.state           = OTG_STATE_UNDEFINED;
1384
1385         otg->phy                = &ab->phy;
1386         otg->set_host           = ab8500_usb_set_host;
1387         otg->set_peripheral     = ab8500_usb_set_peripheral;
1388
1389         if (is_ab8500(ab->ab8500)) {
1390                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1391                         AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1392                         AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1393                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1394         } else if (is_ab8505(ab->ab8500)) {
1395                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1396                         AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1397                         AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1398                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1399         } else if (is_ab8540(ab->ab8500)) {
1400                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1401                         AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS |
1402                         AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK |
1403                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1404         } else if (is_ab9540(ab->ab8500)) {
1405                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1406                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1407                 if (is_ab9540_2p0_or_earlier(ab->ab8500))
1408                         ab->flags |= AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1409                                 AB8500_USB_FLAG_USE_VBUS_DET_IRQ;
1410         }
1411
1412         /* Disable regulator voltage setting for AB8500 <= v2.0 */
1413         if (is_ab8500_2p0_or_earlier(ab->ab8500))
1414                 ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1415
1416         platform_set_drvdata(pdev, ab);
1417
1418         /* all: Disable phy when called from set_host and set_peripheral */
1419         INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
1420
1421         INIT_WORK(&ab->vbus_event_work, ab8500_usb_vbus_turn_on_event_work);
1422
1423         err = ab8500_usb_regulator_get(ab);
1424         if (err)
1425                 return err;
1426
1427         ab->sysclk = devm_clk_get(ab->dev, "sysclk");
1428         if (IS_ERR(ab->sysclk)) {
1429                 dev_err(ab->dev, "Could not get sysclk.\n");
1430                 return PTR_ERR(ab->sysclk);
1431         }
1432
1433         err = ab8500_usb_irq_setup(pdev, ab);
1434         if (err < 0)
1435                 return err;
1436
1437         err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
1438         if (err) {
1439                 dev_err(&pdev->dev, "Can't register transceiver\n");
1440                 return err;
1441         }
1442
1443         if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
1444                 /* Phy tuning values for AB8500 > v2.0 */
1445                 ab8500_usb_set_ab8500_tuning_values(ab);
1446         else if (is_ab8505(ab->ab8500))
1447                 /* Phy tuning values for AB8505 */
1448                 ab8500_usb_set_ab8505_tuning_values(ab);
1449         else if (is_ab8540(ab->ab8500))
1450                 /* Phy tuning values for AB8540 */
1451                 ab8500_usb_set_ab8540_tuning_values(ab);
1452         else if (is_ab9540(ab->ab8500))
1453                 /* Phy tuning values for AB9540 */
1454                 ab8500_usb_set_ab9540_tuning_values(ab);
1455
1456         /* Needed to enable ID detection. */
1457         ab8500_usb_wd_workaround(ab);
1458
1459         /*
1460          * This is required for usb-link-status to work properly when a
1461          * cable is connected at boot time.
1462          */
1463         ab8500_usb_restart_phy(ab);
1464
1465         if (ab->flags & AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS) {
1466                 if (ab8500_usb_check_vbus_status(ab))
1467                         schedule_work(&ab->vbus_event_work);
1468         }
1469
1470         abx500_usb_link_status_update(ab);
1471
1472         dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
1473
1474         return 0;
1475 }
1476
1477 static int ab8500_usb_remove(struct platform_device *pdev)
1478 {
1479         struct ab8500_usb *ab = platform_get_drvdata(pdev);
1480
1481         cancel_work_sync(&ab->phy_dis_work);
1482         cancel_work_sync(&ab->vbus_event_work);
1483
1484         usb_remove_phy(&ab->phy);
1485
1486         if (ab->mode == USB_HOST)
1487                 ab8500_usb_host_phy_dis(ab);
1488         else if (ab->mode == USB_PERIPHERAL)
1489                 ab8500_usb_peri_phy_dis(ab);
1490
1491         return 0;
1492 }
1493
1494 static struct platform_device_id ab8500_usb_devtype[] = {
1495         { .name = "ab8500-usb", },
1496         { .name = "ab8540-usb", },
1497         { .name = "ab9540-usb", },
1498         { /* sentinel */ }
1499 };
1500 MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
1501
1502 static struct platform_driver ab8500_usb_driver = {
1503         .probe          = ab8500_usb_probe,
1504         .remove         = ab8500_usb_remove,
1505         .id_table       = ab8500_usb_devtype,
1506         .driver         = {
1507                 .name   = "abx5x0-usb",
1508                 .owner  = THIS_MODULE,
1509         },
1510 };
1511
1512 static int __init ab8500_usb_init(void)
1513 {
1514         return platform_driver_register(&ab8500_usb_driver);
1515 }
1516 subsys_initcall(ab8500_usb_init);
1517
1518 static void __exit ab8500_usb_exit(void)
1519 {
1520         platform_driver_unregister(&ab8500_usb_driver);
1521 }
1522 module_exit(ab8500_usb_exit);
1523
1524 MODULE_AUTHOR("ST-Ericsson AB");
1525 MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
1526 MODULE_LICENSE("GPL");