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

   1 /*
   2  * USB transceiver driver for AB8500 family chips
   3  *
   4  * Copyright (C) 2010-2013 ST-Ericsson AB
   5  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
   6  * Avinash Kumar <avinash.kumar@stericsson.com>
   7  * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/usb/otg.h>
  28 #include <linux/slab.h>
  29 #include <linux/notifier.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/delay.h>
  32 #include <linux/clk.h>
  33 #include <linux/err.h>
  34 #include <linux/mfd/abx500.h>
  35 #include <linux/mfd/abx500/ab8500.h>
  36 #include <linux/usb/musb-ux500.h>
  37 #include <linux/regulator/consumer.h>
  38 #include <linux/pinctrl/consumer.h>
  39
  40 /* Bank AB8500_SYS_CTRL2_BLOCK */
  41 #define AB8500_MAIN_WD_CTRL_REG 0x01
  42
  43 /* Bank AB8500_USB */
  44 #define AB8500_USB_LINE_STAT_REG 0x80
  45 #define AB8505_USB_LINE_STAT_REG 0x94
  46 #define AB8540_USB_LINK_STAT_REG 0x94
  47 #define AB9540_USB_LINK_STAT_REG 0x94
  48 #define AB8540_USB_OTG_CTL_REG 0x87
  49 #define AB8500_USB_PHY_CTRL_REG 0x8A
  50 #define AB8540_VBUS_CTRL_REG 0x82
  51
  52 /* Bank AB8500_DEVELOPMENT */
  53 #define AB8500_BANK12_ACCESS 0x00
  54
  55 /* Bank AB8500_DEBUG */
  56 #define AB8540_DEBUG 0x32
  57 #define AB8500_USB_PHY_TUNE1 0x05
  58 #define AB8500_USB_PHY_TUNE2 0x06
  59 #define AB8500_USB_PHY_TUNE3 0x07
  60
  61 /* Bank AB8500_INTERRUPT */
  62 #define AB8500_IT_SOURCE2_REG 0x01
  63
  64 #define AB8500_BIT_OTG_STAT_ID (1 << 0)
  65 #define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
  66 #define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
  67 #define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
  68 #define AB8500_BIT_WD_CTRL_KICK (1 << 1)
  69 #define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
  70 #define AB8540_BIT_OTG_CTL_VBUS_VALID_ENA (1 << 0)
  71 #define AB8540_BIT_OTG_CTL_ID_HOST_ENA (1 << 1)
  72 #define AB8540_BIT_OTG_CTL_ID_DEV_ENA (1 << 5)
  73 #define AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA (1 << 0)
  74
  75 #define AB8500_WD_KICK_DELAY_US 100 /* usec */
  76 #define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
  77 #define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
  78
  79 /* Usb line status register */
  80 enum ab8500_usb_link_status {
  81         USB_LINK_NOT_CONFIGURED_8500 = 0,
  82         USB_LINK_STD_HOST_NC_8500,
  83         USB_LINK_STD_HOST_C_NS_8500,
  84         USB_LINK_STD_HOST_C_S_8500,
  85         USB_LINK_HOST_CHG_NM_8500,
  86         USB_LINK_HOST_CHG_HS_8500,
  87         USB_LINK_HOST_CHG_HS_CHIRP_8500,
  88         USB_LINK_DEDICATED_CHG_8500,
  89         USB_LINK_ACA_RID_A_8500,
  90         USB_LINK_ACA_RID_B_8500,
  91         USB_LINK_ACA_RID_C_NM_8500,
  92         USB_LINK_ACA_RID_C_HS_8500,
  93         USB_LINK_ACA_RID_C_HS_CHIRP_8500,
  94         USB_LINK_HM_IDGND_8500,
  95         USB_LINK_RESERVED_8500,
  96         USB_LINK_NOT_VALID_LINK_8500,
  97 };
  98
  99 enum ab8505_usb_link_status {
 100         USB_LINK_NOT_CONFIGURED_8505 = 0,
 101         USB_LINK_STD_HOST_NC_8505,
 102         USB_LINK_STD_HOST_C_NS_8505,
 103         USB_LINK_STD_HOST_C_S_8505,
 104         USB_LINK_CDP_8505,
 105         USB_LINK_RESERVED0_8505,
 106         USB_LINK_RESERVED1_8505,
 107         USB_LINK_DEDICATED_CHG_8505,
 108         USB_LINK_ACA_RID_A_8505,
 109         USB_LINK_ACA_RID_B_8505,
 110         USB_LINK_ACA_RID_C_NM_8505,
 111         USB_LINK_RESERVED2_8505,
 112         USB_LINK_RESERVED3_8505,
 113         USB_LINK_HM_IDGND_8505,
 114         USB_LINK_CHARGERPORT_NOT_OK_8505,
 115         USB_LINK_CHARGER_DM_HIGH_8505,
 116         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
 117         USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
 118         USB_LINK_STD_UPSTREAM_8505,
 119         USB_LINK_CHARGER_SE1_8505,
 120         USB_LINK_CARKIT_CHGR_1_8505,
 121         USB_LINK_CARKIT_CHGR_2_8505,
 122         USB_LINK_ACA_DOCK_CHGR_8505,
 123         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
 124         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
 125         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
 126         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
 127         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
 128 };
 129
 130 enum ab8540_usb_link_status {
 131         USB_LINK_NOT_CONFIGURED_8540 = 0,
 132         USB_LINK_STD_HOST_NC_8540,
 133         USB_LINK_STD_HOST_C_NS_8540,
 134         USB_LINK_STD_HOST_C_S_8540,
 135         USB_LINK_CDP_8540,
 136         USB_LINK_RESERVED0_8540,
 137         USB_LINK_RESERVED1_8540,
 138         USB_LINK_DEDICATED_CHG_8540,
 139         USB_LINK_ACA_RID_A_8540,
 140         USB_LINK_ACA_RID_B_8540,
 141         USB_LINK_ACA_RID_C_NM_8540,
 142         USB_LINK_RESERVED2_8540,
 143         USB_LINK_RESERVED3_8540,
 144         USB_LINK_HM_IDGND_8540,
 145         USB_LINK_CHARGERPORT_NOT_OK_8540,
 146         USB_LINK_CHARGER_DM_HIGH_8540,
 147         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540,
 148         USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540,
 149         USB_LINK_STD_UPSTREAM_8540,
 150         USB_LINK_CHARGER_SE1_8540,
 151         USB_LINK_CARKIT_CHGR_1_8540,
 152         USB_LINK_CARKIT_CHGR_2_8540,
 153         USB_LINK_ACA_DOCK_CHGR_8540,
 154         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8540,
 155         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8540,
 156         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8540,
 157         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8540,
 158         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8540
 159 };
 160
 161 enum ab9540_usb_link_status {
 162         USB_LINK_NOT_CONFIGURED_9540 = 0,
 163         USB_LINK_STD_HOST_NC_9540,
 164         USB_LINK_STD_HOST_C_NS_9540,
 165         USB_LINK_STD_HOST_C_S_9540,
 166         USB_LINK_CDP_9540,
 167         USB_LINK_RESERVED0_9540,
 168         USB_LINK_RESERVED1_9540,
 169         USB_LINK_DEDICATED_CHG_9540,
 170         USB_LINK_ACA_RID_A_9540,
 171         USB_LINK_ACA_RID_B_9540,
 172         USB_LINK_ACA_RID_C_NM_9540,
 173         USB_LINK_RESERVED2_9540,
 174         USB_LINK_RESERVED3_9540,
 175         USB_LINK_HM_IDGND_9540,
 176         USB_LINK_CHARGERPORT_NOT_OK_9540,
 177         USB_LINK_CHARGER_DM_HIGH_9540,
 178         USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540,
 179         USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540,
 180         USB_LINK_STD_UPSTREAM_9540,
 181         USB_LINK_CHARGER_SE1_9540,
 182         USB_LINK_CARKIT_CHGR_1_9540,
 183         USB_LINK_CARKIT_CHGR_2_9540,
 184         USB_LINK_ACA_DOCK_CHGR_9540,
 185         USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_9540,
 186         USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_9540,
 187         USB_LINK_SAMSUNG_UART_CBL_PHY_EN_9540,
 188         USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_9540,
 189         USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_9540
 190 };
 191
 192 enum ab8500_usb_mode {
 193         USB_IDLE = 0,
 194         USB_PERIPHERAL,
 195         USB_HOST,
 196         USB_DEDICATED_CHG
 197 };
 198
 199 /* Register USB_LINK_STATUS interrupt */
 200 #define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ     (1 << 0)
 201 /* Register ID_WAKEUP_F interrupt */
 202 #define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ       (1 << 1)
 203 /* Register VBUS_DET_F interrupt */
 204 #define AB8500_USB_FLAG_USE_VBUS_DET_IRQ        (1 << 2)
 205 /* Driver is using the ab-iddet driver*/
 206 #define AB8500_USB_FLAG_USE_AB_IDDET            (1 << 3)
 207 /* Enable setting regulators voltage */
 208 #define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE   (1 << 4)
 209 /* Enable the check_vbus_status workaround */
 210 #define AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS   (1 << 5)
 211 /* Enable the vbus host workaround */
 212 #define AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK     (1 << 6)
 213
 214 struct ab8500_usb {
 215         struct usb_phy phy;
 216         struct device *dev;
 217         struct ab8500 *ab8500;
 218         unsigned vbus_draw;
 219         struct work_struct phy_dis_work;
 220         struct work_struct vbus_event_work;
 221         enum ab8500_usb_mode mode;
 222         struct clk *sysclk;
 223         struct regulator *v_ape;
 224         struct regulator *v_musb;
 225         struct regulator *v_ulpi;
 226         int saved_v_ulpi;
 227         int previous_link_status_state;
 228         struct pinctrl *pinctrl;
 229         struct pinctrl_state *pins_sleep;
 230         bool enabled_charging_detection;
 231         unsigned int flags;
 232 };
 233
 234 static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
 235 {
 236         return container_of(x, struct ab8500_usb, phy);
 237 }
 238
 239 static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
 240 {
 241         abx500_set_register_interruptible(ab->dev,
 242                 AB8500_SYS_CTRL2_BLOCK,
 243                 AB8500_MAIN_WD_CTRL_REG,
 244                 AB8500_BIT_WD_CTRL_ENABLE);
 245
 246         udelay(AB8500_WD_KICK_DELAY_US);
 247
 248         abx500_set_register_interruptible(ab->dev,
 249                 AB8500_SYS_CTRL2_BLOCK,
 250                 AB8500_MAIN_WD_CTRL_REG,
 251                 (AB8500_BIT_WD_CTRL_ENABLE
 252                 | AB8500_BIT_WD_CTRL_KICK));
 253
 254         udelay(AB8500_WD_V11_DISABLE_DELAY_US);
 255
 256         abx500_set_register_interruptible(ab->dev,
 257                 AB8500_SYS_CTRL2_BLOCK,
 258                 AB8500_MAIN_WD_CTRL_REG,
 259                 0);
 260 }
 261
 262 static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
 263 {
 264         int ret, volt;
 265
 266         ret = regulator_enable(ab->v_ape);
 267         if (ret)
 268                 dev_err(ab->dev, "Failed to enable v-ape\n");
 269
 270         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 271                 ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
 272                 if (ab->saved_v_ulpi < 0)
 273                         dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
 274
 275                 ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
 276                 if (ret < 0)
 277                         dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
 278                                         ret);
 279
 280                 ret = regulator_set_load(ab->v_ulpi, 28000);
 281                 if (ret < 0)
 282                         dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
 283                                         ret);
 284         }
 285
 286         ret = regulator_enable(ab->v_ulpi);
 287         if (ret)
 288                 dev_err(ab->dev, "Failed to enable vddulpivio18\n");
 289
 290         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 291                 volt = regulator_get_voltage(ab->v_ulpi);
 292                 if ((volt != 1300000) && (volt != 1350000))
 293                         dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
 294                                         volt);
 295         }
 296
 297         ret = regulator_enable(ab->v_musb);
 298         if (ret)
 299                 dev_err(ab->dev, "Failed to enable musb_1v8\n");
 300 }
 301
 302 static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
 303 {
 304         int ret;
 305
 306         regulator_disable(ab->v_musb);
 307
 308         regulator_disable(ab->v_ulpi);
 309
 310         /* USB is not the only consumer of Vintcore, restore old settings */
 311         if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
 312                 if (ab->saved_v_ulpi > 0) {
 313                         ret = regulator_set_voltage(ab->v_ulpi,
 314                                         ab->saved_v_ulpi, ab->saved_v_ulpi);
 315                         if (ret < 0)
 316                                 dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
 317                                                 ab->saved_v_ulpi, ret);
 318                 }
 319
 320                 ret = regulator_set_load(ab->v_ulpi, 0);
 321                 if (ret < 0)
 322                         dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
 323                                         ret);
 324         }
 325
 326         regulator_disable(ab->v_ape);
 327 }
 328
 329 static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
 330 {
 331         /* Workaround for v2.0 bug # 31952 */
 332         if (is_ab8500_2p0(ab->ab8500)) {
 333                 abx500_mask_and_set_register_interruptible(ab->dev,
 334                                 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 335                                 bit, bit);
 336                 udelay(AB8500_V20_31952_DISABLE_DELAY_US);
 337         }
 338 }
 339
 340 static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
 341 {
 342         u8 bit;
 343         bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
 344                 AB8500_BIT_PHY_CTRL_DEVICE_EN;
 345
 346         /* mux and configure USB pins to DEFAULT state */
 347         ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
 348         if (IS_ERR(ab->pinctrl))
 349                 dev_err(ab->dev, "could not get/set default pinstate\n");
 350
 351         if (clk_prepare_enable(ab->sysclk))
 352                 dev_err(ab->dev, "can't prepare/enable clock\n");
 353
 354         ab8500_usb_regulator_enable(ab);
 355
 356         abx500_mask_and_set_register_interruptible(ab->dev,
 357                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 358                         bit, bit);
 359
 360         if (ab->flags & AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK) {
 361                 if (sel_host)
 362                         abx500_set_register_interruptible(ab->dev,
 363                                         AB8500_USB, AB8540_USB_OTG_CTL_REG,
 364                                         AB8540_BIT_OTG_CTL_VBUS_VALID_ENA |
 365                                         AB8540_BIT_OTG_CTL_ID_HOST_ENA |
 366                                         AB8540_BIT_OTG_CTL_ID_DEV_ENA);
 367         }
 368 }
 369
 370 static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
 371 {
 372         u8 bit;
 373         bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
 374                 AB8500_BIT_PHY_CTRL_DEVICE_EN;
 375
 376         ab8500_usb_wd_linkstatus(ab, bit);
 377
 378         abx500_mask_and_set_register_interruptible(ab->dev,
 379                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 380                         bit, 0);
 381
 382         /* Needed to disable the phy.*/
 383         ab8500_usb_wd_workaround(ab);
 384
 385         clk_disable_unprepare(ab->sysclk);
 386
 387         ab8500_usb_regulator_disable(ab);
 388
 389         if (!IS_ERR(ab->pinctrl)) {
 390                 /* configure USB pins to SLEEP state */
 391                 ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
 392                                 PINCTRL_STATE_SLEEP);
 393
 394                 if (IS_ERR(ab->pins_sleep))
 395                         dev_dbg(ab->dev, "could not get sleep pinstate\n");
 396                 else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
 397                         dev_err(ab->dev, "could not set pins to sleep state\n");
 398
 399                 /*
 400                  * as USB pins are shared with iddet, release them to allow
 401                  * iddet to request them
 402                  */
 403                 pinctrl_put(ab->pinctrl);
 404         }
 405 }
 406
 407 #define ab8500_usb_host_phy_en(ab)      ab8500_usb_phy_enable(ab, true)
 408 #define ab8500_usb_host_phy_dis(ab)     ab8500_usb_phy_disable(ab, true)
 409 #define ab8500_usb_peri_phy_en(ab)      ab8500_usb_phy_enable(ab, false)
 410 #define ab8500_usb_peri_phy_dis(ab)     ab8500_usb_phy_disable(ab, false)
 411
 412 static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 413                 enum ab9540_usb_link_status lsts)
 414 {
 415         enum ux500_musb_vbus_id_status event = 0;
 416
 417         dev_dbg(ab->dev, "ab9540_usb_link_status_update %d\n", lsts);
 418
 419         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_9540 &&
 420                         (lsts == USB_LINK_STD_HOST_C_NS_9540 ||
 421                          lsts == USB_LINK_STD_HOST_NC_9540))
 422                 return 0;
 423
 424         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_9540 &&
 425                         (lsts == USB_LINK_STD_HOST_NC_9540))
 426                 return 0;
 427
 428         ab->previous_link_status_state = lsts;
 429
 430         switch (lsts) {
 431         case USB_LINK_ACA_RID_B_9540:
 432                 event = UX500_MUSB_RIDB;
 433         case USB_LINK_NOT_CONFIGURED_9540:
 434         case USB_LINK_RESERVED0_9540:
 435         case USB_LINK_RESERVED1_9540:
 436         case USB_LINK_RESERVED2_9540:
 437         case USB_LINK_RESERVED3_9540:
 438                 if (ab->mode == USB_PERIPHERAL)
 439                         atomic_notifier_call_chain(&ab->phy.notifier,
 440                                         UX500_MUSB_CLEAN, &ab->vbus_draw);
 441                 ab->mode = USB_IDLE;
 442                 ab->phy.otg->default_a = false;
 443                 ab->vbus_draw = 0;
 444                 if (event != UX500_MUSB_RIDB)
 445                         event = UX500_MUSB_NONE;
 446                 /* Fallback to default B_IDLE as nothing is connected. */
 447                 ab->phy.otg->state = OTG_STATE_B_IDLE;
 448                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 449                 break;
 450
 451         case USB_LINK_ACA_RID_C_NM_9540:
 452                 event = UX500_MUSB_RIDC;
 453         case USB_LINK_STD_HOST_NC_9540:
 454         case USB_LINK_STD_HOST_C_NS_9540:
 455         case USB_LINK_STD_HOST_C_S_9540:
 456         case USB_LINK_CDP_9540:
 457                 if (ab->mode == USB_HOST) {
 458                         ab->mode = USB_PERIPHERAL;
 459                         ab8500_usb_host_phy_dis(ab);
 460                         ab8500_usb_peri_phy_en(ab);
 461                         atomic_notifier_call_chain(&ab->phy.notifier,
 462                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 463                         usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 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                         usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 471                 }
 472                 if (event != UX500_MUSB_RIDC)
 473                         event = UX500_MUSB_VBUS;
 474                 break;
 475
 476         case USB_LINK_ACA_RID_A_9540:
 477                 event = UX500_MUSB_RIDA;
 478         case USB_LINK_HM_IDGND_9540:
 479         case USB_LINK_STD_UPSTREAM_9540:
 480                 if (ab->mode == USB_PERIPHERAL) {
 481                         ab->mode = USB_HOST;
 482                         ab8500_usb_peri_phy_dis(ab);
 483                         ab8500_usb_host_phy_en(ab);
 484                         atomic_notifier_call_chain(&ab->phy.notifier,
 485                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 486                 }
 487                 if (ab->mode == USB_IDLE) {
 488                         ab->mode = USB_HOST;
 489                         ab8500_usb_host_phy_en(ab);
 490                         atomic_notifier_call_chain(&ab->phy.notifier,
 491                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 492                 }
 493                 ab->phy.otg->default_a = true;
 494                 if (event != UX500_MUSB_RIDA)
 495                         event = UX500_MUSB_ID;
 496
 497                 atomic_notifier_call_chain(&ab->phy.notifier,
 498                                 event, &ab->vbus_draw);
 499                 break;
 500
 501         case USB_LINK_DEDICATED_CHG_9540:
 502                 ab->mode = USB_DEDICATED_CHG;
 503                 event = UX500_MUSB_CHARGER;
 504                 atomic_notifier_call_chain(&ab->phy.notifier,
 505                                 event, &ab->vbus_draw);
 506                 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 507                 break;
 508
 509         case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540:
 510         case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540:
 511                 if (!(is_ab9540_2p0_or_earlier(ab->ab8500))) {
 512                         event = UX500_MUSB_NONE;
 513                         if (ab->mode == USB_HOST) {
 514                                 ab->phy.otg->default_a = false;
 515                                 ab->vbus_draw = 0;
 516                                 atomic_notifier_call_chain(&ab->phy.notifier,
 517                                                 event, &ab->vbus_draw);
 518                                 ab8500_usb_host_phy_dis(ab);
 519                                 ab->mode = USB_IDLE;
 520                         }
 521                         if (ab->mode == USB_PERIPHERAL) {
 522                                 atomic_notifier_call_chain(&ab->phy.notifier,
 523                                                 event, &ab->vbus_draw);
 524                                 ab8500_usb_peri_phy_dis(ab);
 525                                 atomic_notifier_call_chain(&ab->phy.notifier,
 526                                                 UX500_MUSB_CLEAN,
 527                                                 &ab->vbus_draw);
 528                                 ab->mode = USB_IDLE;
 529                                 ab->phy.otg->default_a = false;
 530                                 ab->vbus_draw = 0;
 531                                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 532                         }
 533                 }
 534                 break;
 535
 536         default:
 537                 break;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 544                 enum ab8540_usb_link_status lsts)
 545 {
 546         enum ux500_musb_vbus_id_status event = 0;
 547
 548         dev_dbg(ab->dev, "ab8540_usb_link_status_update %d\n", lsts);
 549
 550         if (ab->enabled_charging_detection) {
 551                 /* Disable USB Charger detection */
 552                 abx500_mask_and_set_register_interruptible(ab->dev,
 553                                 AB8500_USB, AB8540_VBUS_CTRL_REG,
 554                                 AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA, 0x00);
 555                 ab->enabled_charging_detection = false;
 556         }
 557
 558         /*
 559          * Spurious link_status interrupts are seen in case of a
 560          * disconnection of a device in IDGND and RIDA stage
 561          */
 562         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8540 &&
 563                         (lsts == USB_LINK_STD_HOST_C_NS_8540 ||
 564                          lsts == USB_LINK_STD_HOST_NC_8540))
 565                 return 0;
 566
 567         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8540 &&
 568                         (lsts == USB_LINK_STD_HOST_NC_8540))
 569                 return 0;
 570
 571         ab->previous_link_status_state = lsts;
 572
 573         switch (lsts) {
 574         case USB_LINK_ACA_RID_B_8540:
 575                 event = UX500_MUSB_RIDB;
 576         case USB_LINK_NOT_CONFIGURED_8540:
 577         case USB_LINK_RESERVED0_8540:
 578         case USB_LINK_RESERVED1_8540:
 579         case USB_LINK_RESERVED2_8540:
 580         case USB_LINK_RESERVED3_8540:
 581                 ab->mode = USB_IDLE;
 582                 ab->phy.otg->default_a = false;
 583                 ab->vbus_draw = 0;
 584                 if (event != UX500_MUSB_RIDB)
 585                         event = UX500_MUSB_NONE;
 586                 /*
 587                  * Fallback to default B_IDLE as nothing
 588                  * is connected
 589                  */
 590                 ab->phy.otg->state = OTG_STATE_B_IDLE;
 591                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 592                 break;
 593
 594         case USB_LINK_ACA_RID_C_NM_8540:
 595                 event = UX500_MUSB_RIDC;
 596         case USB_LINK_STD_HOST_NC_8540:
 597         case USB_LINK_STD_HOST_C_NS_8540:
 598         case USB_LINK_STD_HOST_C_S_8540:
 599         case USB_LINK_CDP_8540:
 600                 if (ab->mode == USB_IDLE) {
 601                         ab->mode = USB_PERIPHERAL;
 602                         ab8500_usb_peri_phy_en(ab);
 603                         atomic_notifier_call_chain(&ab->phy.notifier,
 604                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 605                         usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 606                 }
 607                 if (event != UX500_MUSB_RIDC)
 608                         event = UX500_MUSB_VBUS;
 609                 break;
 610
 611         case USB_LINK_ACA_RID_A_8540:
 612         case USB_LINK_ACA_DOCK_CHGR_8540:
 613                 event = UX500_MUSB_RIDA;
 614         case USB_LINK_HM_IDGND_8540:
 615         case USB_LINK_STD_UPSTREAM_8540:
 616                 if (ab->mode == USB_IDLE) {
 617                         ab->mode = USB_HOST;
 618                         ab8500_usb_host_phy_en(ab);
 619                         atomic_notifier_call_chain(&ab->phy.notifier,
 620                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 621                 }
 622                 ab->phy.otg->default_a = true;
 623                 if (event != UX500_MUSB_RIDA)
 624                         event = UX500_MUSB_ID;
 625                 atomic_notifier_call_chain(&ab->phy.notifier,
 626                                 event, &ab->vbus_draw);
 627                 break;
 628
 629         case USB_LINK_DEDICATED_CHG_8540:
 630                 ab->mode = USB_DEDICATED_CHG;
 631                 event = UX500_MUSB_CHARGER;
 632                 atomic_notifier_call_chain(&ab->phy.notifier,
 633                                 event, &ab->vbus_draw);
 634                 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 635                 break;
 636
 637         case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540:
 638         case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540:
 639                 event = UX500_MUSB_NONE;
 640                 if (ab->mode == USB_HOST) {
 641                         ab->phy.otg->default_a = false;
 642                         ab->vbus_draw = 0;
 643                         atomic_notifier_call_chain(&ab->phy.notifier,
 644                                         event, &ab->vbus_draw);
 645                         ab8500_usb_host_phy_dis(ab);
 646                         ab->mode = USB_IDLE;
 647                 }
 648                 if (ab->mode == USB_PERIPHERAL) {
 649                         atomic_notifier_call_chain(&ab->phy.notifier,
 650                                         event, &ab->vbus_draw);
 651                         ab8500_usb_peri_phy_dis(ab);
 652                         atomic_notifier_call_chain(&ab->phy.notifier,
 653                                         UX500_MUSB_CLEAN, &ab->vbus_draw);
 654                         ab->mode = USB_IDLE;
 655                         ab->phy.otg->default_a = false;
 656                         ab->vbus_draw = 0;
 657                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 658                 }
 659                 break;
 660
 661         default:
 662                 event = UX500_MUSB_NONE;
 663                 break;
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 670                 enum ab8505_usb_link_status lsts)
 671 {
 672         enum ux500_musb_vbus_id_status event = 0;
 673
 674         dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
 675
 676         /*
 677          * Spurious link_status interrupts are seen at the time of
 678          * disconnection of a device in RIDA state
 679          */
 680         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
 681                         (lsts == USB_LINK_STD_HOST_NC_8505))
 682                 return 0;
 683
 684         ab->previous_link_status_state = lsts;
 685
 686         switch (lsts) {
 687         case USB_LINK_ACA_RID_B_8505:
 688                 event = UX500_MUSB_RIDB;
 689         case USB_LINK_NOT_CONFIGURED_8505:
 690         case USB_LINK_RESERVED0_8505:
 691         case USB_LINK_RESERVED1_8505:
 692         case USB_LINK_RESERVED2_8505:
 693         case USB_LINK_RESERVED3_8505:
 694                 ab->mode = USB_IDLE;
 695                 ab->phy.otg->default_a = false;
 696                 ab->vbus_draw = 0;
 697                 if (event != UX500_MUSB_RIDB)
 698                         event = UX500_MUSB_NONE;
 699                 /*
 700                  * Fallback to default B_IDLE as nothing
 701                  * is connected
 702                  */
 703                 ab->phy.otg->state = OTG_STATE_B_IDLE;
 704                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 705                 break;
 706
 707         case USB_LINK_ACA_RID_C_NM_8505:
 708                 event = UX500_MUSB_RIDC;
 709         case USB_LINK_STD_HOST_NC_8505:
 710         case USB_LINK_STD_HOST_C_NS_8505:
 711         case USB_LINK_STD_HOST_C_S_8505:
 712         case USB_LINK_CDP_8505:
 713                 if (ab->mode == USB_IDLE) {
 714                         ab->mode = USB_PERIPHERAL;
 715                         ab8500_usb_peri_phy_en(ab);
 716                         atomic_notifier_call_chain(&ab->phy.notifier,
 717                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 718                         usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 719                 }
 720                 if (event != UX500_MUSB_RIDC)
 721                         event = UX500_MUSB_VBUS;
 722                 break;
 723
 724         case USB_LINK_ACA_RID_A_8505:
 725         case USB_LINK_ACA_DOCK_CHGR_8505:
 726                 event = UX500_MUSB_RIDA;
 727         case USB_LINK_HM_IDGND_8505:
 728                 if (ab->mode == USB_IDLE) {
 729                         ab->mode = USB_HOST;
 730                         ab8500_usb_host_phy_en(ab);
 731                         atomic_notifier_call_chain(&ab->phy.notifier,
 732                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 733                 }
 734                 ab->phy.otg->default_a = true;
 735                 if (event != UX500_MUSB_RIDA)
 736                         event = UX500_MUSB_ID;
 737                 atomic_notifier_call_chain(&ab->phy.notifier,
 738                                 event, &ab->vbus_draw);
 739                 break;
 740
 741         case USB_LINK_DEDICATED_CHG_8505:
 742                 ab->mode = USB_DEDICATED_CHG;
 743                 event = UX500_MUSB_CHARGER;
 744                 atomic_notifier_call_chain(&ab->phy.notifier,
 745                                 event, &ab->vbus_draw);
 746                 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 747                 break;
 748
 749         default:
 750                 break;
 751         }
 752
 753         return 0;
 754 }
 755
 756 static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 757                 enum ab8500_usb_link_status lsts)
 758 {
 759         enum ux500_musb_vbus_id_status event = 0;
 760
 761         dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
 762
 763         /*
 764          * Spurious link_status interrupts are seen in case of a
 765          * disconnection of a device in IDGND and RIDA stage
 766          */
 767         if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
 768                         (lsts == USB_LINK_STD_HOST_C_NS_8500 ||
 769                          lsts == USB_LINK_STD_HOST_NC_8500))
 770                 return 0;
 771
 772         if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
 773                         lsts == USB_LINK_STD_HOST_NC_8500)
 774                 return 0;
 775
 776         ab->previous_link_status_state = lsts;
 777
 778         switch (lsts) {
 779         case USB_LINK_ACA_RID_B_8500:
 780                 event = UX500_MUSB_RIDB;
 781         case USB_LINK_NOT_CONFIGURED_8500:
 782         case USB_LINK_NOT_VALID_LINK_8500:
 783                 ab->mode = USB_IDLE;
 784                 ab->phy.otg->default_a = false;
 785                 ab->vbus_draw = 0;
 786                 if (event != UX500_MUSB_RIDB)
 787                         event = UX500_MUSB_NONE;
 788                 /* Fallback to default B_IDLE as nothing is connected */
 789                 ab->phy.otg->state = OTG_STATE_B_IDLE;
 790                 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 791                 break;
 792
 793         case USB_LINK_ACA_RID_C_NM_8500:
 794         case USB_LINK_ACA_RID_C_HS_8500:
 795         case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
 796                 event = UX500_MUSB_RIDC;
 797         case USB_LINK_STD_HOST_NC_8500:
 798         case USB_LINK_STD_HOST_C_NS_8500:
 799         case USB_LINK_STD_HOST_C_S_8500:
 800         case USB_LINK_HOST_CHG_NM_8500:
 801         case USB_LINK_HOST_CHG_HS_8500:
 802         case USB_LINK_HOST_CHG_HS_CHIRP_8500:
 803                 if (ab->mode == USB_IDLE) {
 804                         ab->mode = USB_PERIPHERAL;
 805                         ab8500_usb_peri_phy_en(ab);
 806                         atomic_notifier_call_chain(&ab->phy.notifier,
 807                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 808                         usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 809                 }
 810                 if (event != UX500_MUSB_RIDC)
 811                         event = UX500_MUSB_VBUS;
 812                 break;
 813
 814         case USB_LINK_ACA_RID_A_8500:
 815                 event = UX500_MUSB_RIDA;
 816         case USB_LINK_HM_IDGND_8500:
 817                 if (ab->mode == USB_IDLE) {
 818                         ab->mode = USB_HOST;
 819                         ab8500_usb_host_phy_en(ab);
 820                         atomic_notifier_call_chain(&ab->phy.notifier,
 821                                         UX500_MUSB_PREPARE, &ab->vbus_draw);
 822                 }
 823                 ab->phy.otg->default_a = true;
 824                 if (event != UX500_MUSB_RIDA)
 825                         event = UX500_MUSB_ID;
 826                 atomic_notifier_call_chain(&ab->phy.notifier,
 827                                 event, &ab->vbus_draw);
 828                 break;
 829
 830         case USB_LINK_DEDICATED_CHG_8500:
 831                 ab->mode = USB_DEDICATED_CHG;
 832                 event = UX500_MUSB_CHARGER;
 833                 atomic_notifier_call_chain(&ab->phy.notifier,
 834                                 event, &ab->vbus_draw);
 835                 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 836                 break;
 837
 838         case USB_LINK_RESERVED_8500:
 839                 break;
 840         }
 841
 842         return 0;
 843 }
 844
 845 /*
 846  * Connection Sequence:
 847  *   1. Link Status Interrupt
 848  *   2. Enable AB clock
 849  *   3. Enable AB regulators
 850  *   4. Enable USB phy
 851  *   5. Reset the musb controller
 852  *   6. Switch the ULPI GPIO pins to fucntion mode
 853  *   7. Enable the musb Peripheral5 clock
 854  *   8. Restore MUSB context
 855  */
 856 static int abx500_usb_link_status_update(struct ab8500_usb *ab)
 857 {
 858         u8 reg;
 859         int ret = 0;
 860
 861         if (is_ab8500(ab->ab8500)) {
 862                 enum ab8500_usb_link_status lsts;
 863
 864                 abx500_get_register_interruptible(ab->dev,
 865                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &reg);
 866                 lsts = (reg >> 3) & 0x0F;
 867                 ret = ab8500_usb_link_status_update(ab, lsts);
 868         } else if (is_ab8505(ab->ab8500)) {
 869                 enum ab8505_usb_link_status lsts;
 870
 871                 abx500_get_register_interruptible(ab->dev,
 872                                 AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
 873                 lsts = (reg >> 3) & 0x1F;
 874                 ret = ab8505_usb_link_status_update(ab, lsts);
 875         } else if (is_ab8540(ab->ab8500)) {
 876                 enum ab8540_usb_link_status lsts;
 877
 878                 abx500_get_register_interruptible(ab->dev,
 879                                 AB8500_USB, AB8540_USB_LINK_STAT_REG, &reg);
 880                 lsts = (reg >> 3) & 0xFF;
 881                 ret = ab8540_usb_link_status_update(ab, lsts);
 882         } else if (is_ab9540(ab->ab8500)) {
 883                 enum ab9540_usb_link_status lsts;
 884
 885                 abx500_get_register_interruptible(ab->dev,
 886                                 AB8500_USB, AB9540_USB_LINK_STAT_REG, &reg);
 887                 lsts = (reg >> 3) & 0xFF;
 888                 ret = ab9540_usb_link_status_update(ab, lsts);
 889         }
 890
 891         return ret;
 892 }
 893
 894 /*
 895  * Disconnection Sequence:
 896  *   1. Disconnect Interrupt
 897  *   2. Disable regulators
 898  *   3. Disable AB clock
 899  *   4. Disable the Phy
 900  *   5. Link Status Interrupt
 901  *   6. Disable Musb Clock
 902  */
 903 static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
 904 {
 905         struct ab8500_usb *ab = (struct ab8500_usb *) data;
 906         enum usb_phy_events event = UX500_MUSB_NONE;
 907
 908         /* Link status will not be updated till phy is disabled. */
 909         if (ab->mode == USB_HOST) {
 910                 ab->phy.otg->default_a = false;
 911                 ab->vbus_draw = 0;
 912                 atomic_notifier_call_chain(&ab->phy.notifier,
 913                                 event, &ab->vbus_draw);
 914                 ab8500_usb_host_phy_dis(ab);
 915                 ab->mode = USB_IDLE;
 916         }
 917
 918         if (ab->mode == USB_PERIPHERAL) {
 919                 atomic_notifier_call_chain(&ab->phy.notifier,
 920                                 event, &ab->vbus_draw);
 921                 ab8500_usb_peri_phy_dis(ab);
 922                 atomic_notifier_call_chain(&ab->phy.notifier,
 923                                 UX500_MUSB_CLEAN, &ab->vbus_draw);
 924                 ab->mode = USB_IDLE;
 925                 ab->phy.otg->default_a = false;
 926                 ab->vbus_draw = 0;
 927         }
 928
 929         if (is_ab8500_2p0(ab->ab8500)) {
 930                 if (ab->mode == USB_DEDICATED_CHG) {
 931                         ab8500_usb_wd_linkstatus(ab,
 932                                         AB8500_BIT_PHY_CTRL_DEVICE_EN);
 933                         abx500_mask_and_set_register_interruptible(ab->dev,
 934                                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
 935                                         AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
 936                 }
 937         }
 938
 939         return IRQ_HANDLED;
 940 }
 941
 942 static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
 943 {
 944         struct ab8500_usb *ab = (struct ab8500_usb *)data;
 945
 946         abx500_usb_link_status_update(ab);
 947
 948         return IRQ_HANDLED;
 949 }
 950
 951 static void ab8500_usb_phy_disable_work(struct work_struct *work)
 952 {
 953         struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
 954                                                 phy_dis_work);
 955
 956         if (!ab->phy.otg->host)
 957                 ab8500_usb_host_phy_dis(ab);
 958
 959         if (!ab->phy.otg->gadget)
 960                 ab8500_usb_peri_phy_dis(ab);
 961 }
 962
 963 /* Check if VBUS is set and linkstatus has not detected a cable. */
 964 static bool ab8500_usb_check_vbus_status(struct ab8500_usb *ab)
 965 {
 966         u8 isource2;
 967         u8 reg;
 968         enum ab8540_usb_link_status lsts;
 969
 970         abx500_get_register_interruptible(ab->dev,
 971                         AB8500_INTERRUPT, AB8500_IT_SOURCE2_REG,
 972                         &isource2);
 973
 974         /* If Vbus is below 3.6V abort */
 975         if (!(isource2 & AB8500_BIT_SOURCE2_VBUSDET))
 976                 return false;
 977
 978         abx500_get_register_interruptible(ab->dev,
 979                         AB8500_USB, AB8540_USB_LINK_STAT_REG,
 980                         &reg);
 981
 982         lsts = (reg >> 3) & 0xFF;
 983
 984         /* Check if linkstatus has detected a cable */
 985         if (lsts)
 986                 return false;
 987
 988         return true;
 989 }
 990
 991 /* re-trigger charger detection again with watchdog re-kick. */
 992 static void ab8500_usb_vbus_turn_on_event_work(struct work_struct *work)
 993 {
 994         struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
 995                         vbus_event_work);
 996
 997         if (ab->mode != USB_IDLE)
 998                 return;
 999
1000         abx500_set_register_interruptible(ab->dev,
1001                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1002                         AB8500_BIT_WD_CTRL_ENABLE);
1003
1004         udelay(100);
1005
1006         abx500_set_register_interruptible(ab->dev,
1007                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1008                         AB8500_BIT_WD_CTRL_ENABLE | AB8500_BIT_WD_CTRL_KICK);
1009
1010         udelay(100);
1011
1012         /* Disable Main watchdog */
1013         abx500_set_register_interruptible(ab->dev,
1014                         AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1015                         0x0);
1016
1017         /* Enable USB Charger detection */
1018         abx500_mask_and_set_register_interruptible(ab->dev,
1019                         AB8500_USB, AB8540_VBUS_CTRL_REG,
1020                         AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA,
1021                         AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA);
1022
1023         ab->enabled_charging_detection = true;
1024 }
1025
1026 static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
1027 {
1028         /*
1029          * AB8500 V2 has eye diagram issues when drawing more than 100mA from
1030          * VBUS.  Set charging current to 100mA in case of standard host
1031          */
1032         if (is_ab8500_2p0_or_earlier(ab->ab8500))
1033                 if (mA > 100)
1034                         mA = 100;
1035
1036         return mA;
1037 }
1038
1039 static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
1040 {
1041         struct ab8500_usb *ab;
1042
1043         if (!phy)
1044                 return -ENODEV;
1045
1046         ab = phy_to_ab(phy);
1047
1048         mA = ab8500_eyediagram_workaroud(ab, mA);
1049
1050         ab->vbus_draw = mA;
1051
1052         atomic_notifier_call_chain(&ab->phy.notifier,
1053                         UX500_MUSB_VBUS, &ab->vbus_draw);
1054
1055         return 0;
1056 }
1057
1058 static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
1059 {
1060         /* TODO */
1061         return 0;
1062 }
1063
1064 static int ab8500_usb_set_peripheral(struct usb_otg *otg,
1065                                         struct usb_gadget *gadget)
1066 {
1067         struct ab8500_usb *ab;
1068
1069         if (!otg)
1070                 return -ENODEV;
1071
1072         ab = phy_to_ab(otg->usb_phy);
1073
1074         ab->phy.otg->gadget = gadget;
1075
1076         /* Some drivers call this function in atomic context.
1077          * Do not update ab8500 registers directly till this
1078          * is fixed.
1079          */
1080
1081         if ((ab->mode != USB_IDLE) && !gadget) {
1082                 ab->mode = USB_IDLE;
1083                 schedule_work(&ab->phy_dis_work);
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
1090 {
1091         struct ab8500_usb *ab;
1092
1093         if (!otg)
1094                 return -ENODEV;
1095
1096         ab = phy_to_ab(otg->usb_phy);
1097
1098         ab->phy.otg->host = host;
1099
1100         /* Some drivers call this function in atomic context.
1101          * Do not update ab8500 registers directly till this
1102          * is fixed.
1103          */
1104
1105         if ((ab->mode != USB_IDLE) && !host) {
1106                 ab->mode = USB_IDLE;
1107                 schedule_work(&ab->phy_dis_work);
1108         }
1109
1110         return 0;
1111 }
1112
1113 static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
1114 {
1115         abx500_mask_and_set_register_interruptible(ab->dev,
1116                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1117                         AB8500_BIT_PHY_CTRL_DEVICE_EN,
1118                         AB8500_BIT_PHY_CTRL_DEVICE_EN);
1119
1120         udelay(100);
1121
1122         abx500_mask_and_set_register_interruptible(ab->dev,
1123                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1124                         AB8500_BIT_PHY_CTRL_DEVICE_EN,
1125                         0);
1126
1127         abx500_mask_and_set_register_interruptible(ab->dev,
1128                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1129                         AB8500_BIT_PHY_CTRL_HOST_EN,
1130                         AB8500_BIT_PHY_CTRL_HOST_EN);
1131
1132         udelay(100);
1133
1134         abx500_mask_and_set_register_interruptible(ab->dev,
1135                         AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1136                         AB8500_BIT_PHY_CTRL_HOST_EN,
1137                         0);
1138 }
1139
1140 static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
1141 {
1142         int err;
1143
1144         ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
1145         if (IS_ERR(ab->v_ape)) {
1146                 dev_err(ab->dev, "Could not get v-ape supply\n");
1147                 err = PTR_ERR(ab->v_ape);
1148                 return err;
1149         }
1150
1151         ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
1152         if (IS_ERR(ab->v_ulpi)) {
1153                 dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
1154                 err = PTR_ERR(ab->v_ulpi);
1155                 return err;
1156         }
1157
1158         ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
1159         if (IS_ERR(ab->v_musb)) {
1160                 dev_err(ab->dev, "Could not get musb_1v8 supply\n");
1161                 err = PTR_ERR(ab->v_musb);
1162                 return err;
1163         }
1164
1165         return 0;
1166 }
1167
1168 static int ab8500_usb_irq_setup(struct platform_device *pdev,
1169                 struct ab8500_usb *ab)
1170 {
1171         int err;
1172         int irq;
1173
1174         if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
1175                 irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
1176                 if (irq < 0) {
1177                         dev_err(&pdev->dev, "Link status irq not found\n");
1178                         return irq;
1179                 }
1180                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1181                                 ab8500_usb_link_status_irq,
1182                                 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
1183                                 "usb-link-status", ab);
1184                 if (err < 0) {
1185                         dev_err(ab->dev, "request_irq failed for link status irq\n");
1186                         return err;
1187                 }
1188         }
1189
1190         if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
1191                 irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
1192                 if (irq < 0) {
1193                         dev_err(&pdev->dev, "ID fall irq not found\n");
1194                         return irq;
1195                 }
1196                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1197                                 ab8500_usb_disconnect_irq,
1198                                 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
1199                                 "usb-id-fall", ab);
1200                 if (err < 0) {
1201                         dev_err(ab->dev, "request_irq failed for ID fall irq\n");
1202                         return err;
1203                 }
1204         }
1205
1206         if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
1207                 irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
1208                 if (irq < 0) {
1209                         dev_err(&pdev->dev, "VBUS fall irq not found\n");
1210                         return irq;
1211                 }
1212                 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1213                                 ab8500_usb_disconnect_irq,
1214                                 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
1215                                 "usb-vbus-fall", ab);
1216                 if (err < 0) {
1217                         dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
1218                         return err;
1219                 }
1220         }
1221
1222         return 0;
1223 }
1224
1225 static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
1226 {
1227         int err;
1228
1229         /* Enable the PBT/Bank 0x12 access */
1230         err = abx500_set_register_interruptible(ab->dev,
1231                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1232         if (err < 0)
1233                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1234                                 err);
1235
1236         err = abx500_set_register_interruptible(ab->dev,
1237                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1238         if (err < 0)
1239                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1240                                 err);
1241
1242         err = abx500_set_register_interruptible(ab->dev,
1243                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
1244         if (err < 0)
1245                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1246                                 err);
1247
1248         err = abx500_set_register_interruptible(ab->dev,
1249                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
1250         if (err < 0)
1251                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1252                                 err);
1253
1254         /* Switch to normal mode/disable Bank 0x12 access */
1255         err = abx500_set_register_interruptible(ab->dev,
1256                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1257         if (err < 0)
1258                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1259                                 err);
1260 }
1261
1262 static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
1263 {
1264         int err;
1265
1266         /* Enable the PBT/Bank 0x12 access */
1267         err = abx500_mask_and_set_register_interruptible(ab->dev,
1268                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1269                         0x01, 0x01);
1270         if (err < 0)
1271                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1272                                 err);
1273
1274         err = abx500_mask_and_set_register_interruptible(ab->dev,
1275                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
1276                         0xC8, 0xC8);
1277         if (err < 0)
1278                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1279                                 err);
1280
1281         err = abx500_mask_and_set_register_interruptible(ab->dev,
1282                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
1283                         0x60, 0x60);
1284         if (err < 0)
1285                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1286                                 err);
1287
1288         err = abx500_mask_and_set_register_interruptible(ab->dev,
1289                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
1290                         0xFC, 0x80);
1291
1292         if (err < 0)
1293                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1294                                 err);
1295
1296         /* Switch to normal mode/disable Bank 0x12 access */
1297         err = abx500_mask_and_set_register_interruptible(ab->dev,
1298                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1299                         0x00, 0x00);
1300         if (err < 0)
1301                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1302                                 err);
1303 }
1304
1305 static void ab8500_usb_set_ab8540_tuning_values(struct ab8500_usb *ab)
1306 {
1307         int err;
1308
1309         err = abx500_set_register_interruptible(ab->dev,
1310                         AB8540_DEBUG, AB8500_USB_PHY_TUNE1, 0xCC);
1311         if (err < 0)
1312                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register ret=%d\n",
1313                                 err);
1314
1315         err = abx500_set_register_interruptible(ab->dev,
1316                         AB8540_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1317         if (err < 0)
1318                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register ret=%d\n",
1319                                 err);
1320
1321         err = abx500_set_register_interruptible(ab->dev,
1322                         AB8540_DEBUG, AB8500_USB_PHY_TUNE3, 0x90);
1323         if (err < 0)
1324                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester ret=%d\n",
1325                                 err);
1326 }
1327
1328 static void ab8500_usb_set_ab9540_tuning_values(struct ab8500_usb *ab)
1329 {
1330         int err;
1331
1332         /* Enable the PBT/Bank 0x12 access */
1333         err = abx500_set_register_interruptible(ab->dev,
1334                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1335         if (err < 0)
1336                 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1337                                 err);
1338
1339         err = abx500_set_register_interruptible(ab->dev,
1340                         AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1341         if (err < 0)
1342                 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1343                                 err);
1344
1345         err = abx500_set_register_interruptible(ab->dev,
1346                         AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1347         if (err < 0)
1348                 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1349                                 err);
1350
1351         err = abx500_set_register_interruptible(ab->dev,
1352                         AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x80);
1353         if (err < 0)
1354                 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1355                                 err);
1356
1357         /* Switch to normal mode/disable Bank 0x12 access */
1358         err = abx500_set_register_interruptible(ab->dev,
1359                         AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1360         if (err < 0)
1361                 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1362                                 err);
1363 }
1364
1365 static int ab8500_usb_probe(struct platform_device *pdev)
1366 {
1367         struct ab8500_usb       *ab;
1368         struct ab8500           *ab8500;
1369         struct usb_otg          *otg;
1370         int err;
1371         int rev;
1372
1373         ab8500 = dev_get_drvdata(pdev->dev.parent);
1374         rev = abx500_get_chip_id(&pdev->dev);
1375
1376         if (is_ab8500_1p1_or_earlier(ab8500)) {
1377                 dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
1378                 return -ENODEV;
1379         }
1380
1381         ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
1382         if (!ab)
1383                 return -ENOMEM;
1384
1385         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
1386         if (!otg)
1387                 return -ENOMEM;
1388
1389         ab->dev                 = &pdev->dev;
1390         ab->ab8500              = ab8500;
1391         ab->phy.dev             = ab->dev;
1392         ab->phy.otg             = otg;
1393         ab->phy.label           = "ab8500";
1394         ab->phy.set_suspend     = ab8500_usb_set_suspend;
1395         ab->phy.set_power       = ab8500_usb_set_power;
1396         ab->phy.otg->state      = OTG_STATE_UNDEFINED;
1397
1398         otg->usb_phy            = &ab->phy;
1399         otg->set_host           = ab8500_usb_set_host;
1400         otg->set_peripheral     = ab8500_usb_set_peripheral;
1401
1402         if (is_ab8500(ab->ab8500)) {
1403                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1404                         AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1405                         AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1406                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1407         } else if (is_ab8505(ab->ab8500)) {
1408                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1409                         AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1410                         AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1411                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1412         } else if (is_ab8540(ab->ab8500)) {
1413                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1414                         AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS |
1415                         AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK |
1416                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1417         } else if (is_ab9540(ab->ab8500)) {
1418                 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1419                         AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1420                 if (is_ab9540_2p0_or_earlier(ab->ab8500))
1421                         ab->flags |= AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1422                                 AB8500_USB_FLAG_USE_VBUS_DET_IRQ;
1423         }
1424
1425         /* Disable regulator voltage setting for AB8500 <= v2.0 */
1426         if (is_ab8500_2p0_or_earlier(ab->ab8500))
1427                 ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1428
1429         platform_set_drvdata(pdev, ab);
1430
1431         /* all: Disable phy when called from set_host and set_peripheral */
1432         INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
1433
1434         INIT_WORK(&ab->vbus_event_work, ab8500_usb_vbus_turn_on_event_work);
1435
1436         err = ab8500_usb_regulator_get(ab);
1437         if (err)
1438                 return err;
1439
1440         ab->sysclk = devm_clk_get(ab->dev, "sysclk");
1441         if (IS_ERR(ab->sysclk)) {
1442                 dev_err(ab->dev, "Could not get sysclk.\n");
1443                 return PTR_ERR(ab->sysclk);
1444         }
1445
1446         err = ab8500_usb_irq_setup(pdev, ab);
1447         if (err < 0)
1448                 return err;
1449
1450         err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
1451         if (err) {
1452                 dev_err(&pdev->dev, "Can't register transceiver\n");
1453                 return err;
1454         }
1455
1456         if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
1457                 /* Phy tuning values for AB8500 > v2.0 */
1458                 ab8500_usb_set_ab8500_tuning_values(ab);
1459         else if (is_ab8505(ab->ab8500))
1460                 /* Phy tuning values for AB8505 */
1461                 ab8500_usb_set_ab8505_tuning_values(ab);
1462         else if (is_ab8540(ab->ab8500))
1463                 /* Phy tuning values for AB8540 */
1464                 ab8500_usb_set_ab8540_tuning_values(ab);
1465         else if (is_ab9540(ab->ab8500))
1466                 /* Phy tuning values for AB9540 */
1467                 ab8500_usb_set_ab9540_tuning_values(ab);
1468
1469         /* Needed to enable ID detection. */
1470         ab8500_usb_wd_workaround(ab);
1471
1472         /*
1473          * This is required for usb-link-status to work properly when a
1474          * cable is connected at boot time.
1475          */
1476         ab8500_usb_restart_phy(ab);
1477
1478         if (ab->flags & AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS) {
1479                 if (ab8500_usb_check_vbus_status(ab))
1480                         schedule_work(&ab->vbus_event_work);
1481         }
1482
1483         abx500_usb_link_status_update(ab);
1484
1485         dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
1486
1487         return 0;
1488 }
1489
1490 static int ab8500_usb_remove(struct platform_device *pdev)
1491 {
1492         struct ab8500_usb *ab = platform_get_drvdata(pdev);
1493
1494         cancel_work_sync(&ab->phy_dis_work);
1495         cancel_work_sync(&ab->vbus_event_work);
1496
1497         usb_remove_phy(&ab->phy);
1498
1499         if (ab->mode == USB_HOST)
1500                 ab8500_usb_host_phy_dis(ab);
1501         else if (ab->mode == USB_PERIPHERAL)
1502                 ab8500_usb_peri_phy_dis(ab);
1503
1504         return 0;
1505 }
1506
1507 static const struct platform_device_id ab8500_usb_devtype[] = {
1508         { .name = "ab8500-usb", },
1509         { .name = "ab8540-usb", },
1510         { .name = "ab9540-usb", },
1511         { /* sentinel */ }
1512 };
1513 MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
1514
1515 static struct platform_driver ab8500_usb_driver = {
1516         .probe          = ab8500_usb_probe,
1517         .remove         = ab8500_usb_remove,
1518         .id_table       = ab8500_usb_devtype,
1519         .driver         = {
1520                 .name   = "abx5x0-usb",
1521         },
1522 };
1523
1524 static int __init ab8500_usb_init(void)
1525 {
1526         return platform_driver_register(&ab8500_usb_driver);
1527 }
1528 subsys_initcall(ab8500_usb_init);
1529
1530 static void __exit ab8500_usb_exit(void)
1531 {
1532         platform_driver_unregister(&ab8500_usb_driver);
1533 }
1534 module_exit(ab8500_usb_exit);
1535
1536 MODULE_AUTHOR("ST-Ericsson AB");
1537 MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
1538 MODULE_LICENSE("GPL");