drivers/usb/otg/twl4030-usb.c

   1 /*
   2  * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004-2007 Texas Instruments
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * Current status:
  23  *      - HS USB ULPI mode works.
  24  *      - 3-pin mode support may be added in future.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/io.h>
  34 #include <linux/delay.h>
  35 #include <linux/usb/otg.h>
  36 #include <linux/usb/ulpi.h>
  37 #include <linux/i2c/twl.h>
  38 #include <linux/regulator/consumer.h>
  39 #include <linux/err.h>
  40 #include <linux/notifier.h>
  41 #include <linux/slab.h>
  42
  43 /* Register defines */
  44
  45 #define MCPC_CTRL                       0x30
  46 #define MCPC_CTRL_RTSOL                 (1 << 7)
  47 #define MCPC_CTRL_EXTSWR                (1 << 6)
  48 #define MCPC_CTRL_EXTSWC                (1 << 5)
  49 #define MCPC_CTRL_VOICESW               (1 << 4)
  50 #define MCPC_CTRL_OUT64K                (1 << 3)
  51 #define MCPC_CTRL_RTSCTSSW              (1 << 2)
  52 #define MCPC_CTRL_HS_UART               (1 << 0)
  53
  54 #define MCPC_IO_CTRL                    0x33
  55 #define MCPC_IO_CTRL_MICBIASEN          (1 << 5)
  56 #define MCPC_IO_CTRL_CTS_NPU            (1 << 4)
  57 #define MCPC_IO_CTRL_RXD_PU             (1 << 3)
  58 #define MCPC_IO_CTRL_TXDTYP             (1 << 2)
  59 #define MCPC_IO_CTRL_CTSTYP             (1 << 1)
  60 #define MCPC_IO_CTRL_RTSTYP             (1 << 0)
  61
  62 #define MCPC_CTRL2                      0x36
  63 #define MCPC_CTRL2_MCPC_CK_EN           (1 << 0)
  64
  65 #define OTHER_FUNC_CTRL                 0x80
  66 #define OTHER_FUNC_CTRL_BDIS_ACON_EN    (1 << 4)
  67 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE   (1 << 2)
  68
  69 #define OTHER_IFC_CTRL                  0x83
  70 #define OTHER_IFC_CTRL_OE_INT_EN        (1 << 6)
  71 #define OTHER_IFC_CTRL_CEA2011_MODE     (1 << 5)
  72 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN      (1 << 4)
  73 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT       (1 << 3)
  74 #define OTHER_IFC_CTRL_HIZ_ULPI         (1 << 2)
  75 #define OTHER_IFC_CTRL_ALT_INT_REROUTE  (1 << 0)
  76
  77 #define OTHER_INT_EN_RISE               0x86
  78 #define OTHER_INT_EN_FALL               0x89
  79 #define OTHER_INT_STS                   0x8C
  80 #define OTHER_INT_LATCH                 0x8D
  81 #define OTHER_INT_VB_SESS_VLD           (1 << 7)
  82 #define OTHER_INT_DM_HI                 (1 << 6) /* not valid for "latch" reg */
  83 #define OTHER_INT_DP_HI                 (1 << 5) /* not valid for "latch" reg */
  84 #define OTHER_INT_BDIS_ACON             (1 << 3) /* not valid for "fall" regs */
  85 #define OTHER_INT_MANU                  (1 << 1)
  86 #define OTHER_INT_ABNORMAL_STRESS       (1 << 0)
  87
  88 #define ID_STATUS                       0x96
  89 #define ID_RES_FLOAT                    (1 << 4)
  90 #define ID_RES_440K                     (1 << 3)
  91 #define ID_RES_200K                     (1 << 2)
  92 #define ID_RES_102K                     (1 << 1)
  93 #define ID_RES_GND                      (1 << 0)
  94
  95 #define POWER_CTRL                      0xAC
  96 #define POWER_CTRL_OTG_ENAB             (1 << 5)
  97
  98 #define OTHER_IFC_CTRL2                 0xAF
  99 #define OTHER_IFC_CTRL2_ULPI_STP_LOW    (1 << 4)
 100 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL   (1 << 3)
 101 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430  (1 << 2)
 102 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK     (3 << 0) /* bits 0 and 1 */
 103 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N    (0 << 0)
 104 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N    (1 << 0)
 105
 106 #define REG_CTRL_EN                     0xB2
 107 #define REG_CTRL_ERROR                  0xB5
 108 #define ULPI_I2C_CONFLICT_INTEN         (1 << 0)
 109
 110 #define OTHER_FUNC_CTRL2                0xB8
 111 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN  (1 << 0)
 112
 113 /* following registers do not have separate _clr and _set registers */
 114 #define VBUS_DEBOUNCE                   0xC0
 115 #define ID_DEBOUNCE                     0xC1
 116 #define VBAT_TIMER                      0xD3
 117 #define PHY_PWR_CTRL                    0xFD
 118 #define PHY_PWR_PHYPWD                  (1 << 0)
 119 #define PHY_CLK_CTRL                    0xFE
 120 #define PHY_CLK_CTRL_CLOCKGATING_EN     (1 << 2)
 121 #define PHY_CLK_CTRL_CLK32K_EN          (1 << 1)
 122 #define REQ_PHY_DPLL_CLK                (1 << 0)
 123 #define PHY_CLK_CTRL_STS                0xFF
 124 #define PHY_DPLL_CLK                    (1 << 0)
 125
 126 /* In module TWL4030_MODULE_PM_MASTER */
 127 #define STS_HW_CONDITIONS               0x0F
 128
 129 /* In module TWL4030_MODULE_PM_RECEIVER */
 130 #define VUSB_DEDICATED1                 0x7D
 131 #define VUSB_DEDICATED2                 0x7E
 132 #define VUSB1V5_DEV_GRP                 0x71
 133 #define VUSB1V5_TYPE                    0x72
 134 #define VUSB1V5_REMAP                   0x73
 135 #define VUSB1V8_DEV_GRP                 0x74
 136 #define VUSB1V8_TYPE                    0x75
 137 #define VUSB1V8_REMAP                   0x76
 138 #define VUSB3V1_DEV_GRP                 0x77
 139 #define VUSB3V1_TYPE                    0x78
 140 #define VUSB3V1_REMAP                   0x79
 141
 142 /* In module TWL4030_MODULE_INTBR */
 143 #define PMBR1                           0x0D
 144 #define GPIO_USB_4PIN_ULPI_2430C        (3 << 0)
 145
 146 struct twl4030_usb {
 147         struct otg_transceiver  otg;
 148         struct device           *dev;
 149
 150         /* TWL4030 internal USB regulator supplies */
 151         struct regulator        *usb1v5;
 152         struct regulator        *usb1v8;
 153         struct regulator        *usb3v1;
 154
 155         /* for vbus reporting with irqs disabled */
 156         spinlock_t              lock;
 157
 158         /* pin configuration */
 159         enum twl4030_usb_mode   usb_mode;
 160
 161         int                     irq;
 162         u8                      linkstat;
 163         bool                    vbus_supplied;
 164         u8                      asleep;
 165         bool                    irq_enabled;
 166 };
 167
 168 /* internal define on top of container_of */
 169 #define xceiv_to_twl(x)         container_of((x), struct twl4030_usb, otg)
 170
 171 /*-------------------------------------------------------------------------*/
 172
 173 static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
 174                 u8 module, u8 data, u8 address)
 175 {
 176         u8 check;
 177
 178         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
 179             (twl_i2c_read_u8(module, &check, address) >= 0) &&
 180                                                 (check == data))
 181                 return 0;
 182         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
 183                         1, module, address, check, data);
 184
 185         /* Failed once: Try again */
 186         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
 187             (twl_i2c_read_u8(module, &check, address) >= 0) &&
 188                                                 (check == data))
 189                 return 0;
 190         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
 191                         2, module, address, check, data);
 192
 193         /* Failed again: Return error */
 194         return -EBUSY;
 195 }
 196
 197 #define twl4030_usb_write_verify(twl, address, data)    \
 198         twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
 199
 200 static inline int twl4030_usb_write(struct twl4030_usb *twl,
 201                 u8 address, u8 data)
 202 {
 203         int ret = 0;
 204
 205         ret = twl_i2c_write_u8(TWL4030_MODULE_USB, data, address);
 206         if (ret < 0)
 207                 dev_dbg(twl->dev,
 208                         "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
 209         return ret;
 210 }
 211
 212 static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
 213 {
 214         u8 data;
 215         int ret = 0;
 216
 217         ret = twl_i2c_read_u8(module, &data, address);
 218         if (ret >= 0)
 219                 ret = data;
 220         else
 221                 dev_dbg(twl->dev,
 222                         "TWL4030:readb[0x%x,0x%x] Error %d\n",
 223                                         module, address, ret);
 224
 225         return ret;
 226 }
 227
 228 static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
 229 {
 230         return twl4030_readb(twl, TWL4030_MODULE_USB, address);
 231 }
 232
 233 /*-------------------------------------------------------------------------*/
 234
 235 static inline int
 236 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 237 {
 238         return twl4030_usb_write(twl, ULPI_SET(reg), bits);
 239 }
 240
 241 static inline int
 242 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 243 {
 244         return twl4030_usb_write(twl, ULPI_CLR(reg), bits);
 245 }
 246
 247 /*-------------------------------------------------------------------------*/
 248
 249 static enum usb_xceiv_events twl4030_usb_linkstat(struct twl4030_usb *twl)
 250 {
 251         int     status;
 252         int     linkstat = USB_EVENT_NONE;
 253
 254         twl->vbus_supplied = false;
 255
 256         /*
 257          * For ID/VBUS sensing, see manual section 15.4.8 ...
 258          * except when using only battery backup power, two
 259          * comparators produce VBUS_PRES and ID_PRES signals,
 260          * which don't match docs elsewhere.  But ... BIT(7)
 261          * and BIT(2) of STS_HW_CONDITIONS, respectively, do
 262          * seem to match up.  If either is true the USB_PRES
 263          * signal is active, the OTG module is activated, and
 264          * its interrupt may be raised (may wake the system).
 265          */
 266         status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER,
 267                         STS_HW_CONDITIONS);
 268         if (status < 0)
 269                 dev_err(twl->dev, "USB link status err %d\n", status);
 270         else if (status & (BIT(7) | BIT(2))) {
 271                 if (status & (BIT(7)))
 272                         twl->vbus_supplied = true;
 273
 274                 if (status & BIT(2))
 275                         linkstat = USB_EVENT_ID;
 276                 else
 277                         linkstat = USB_EVENT_VBUS;
 278         } else
 279                 linkstat = USB_EVENT_NONE;
 280
 281         dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
 282                         status, status, linkstat);
 283
 284         twl->otg.last_event = linkstat;
 285
 286         /* REVISIT this assumes host and peripheral controllers
 287          * are registered, and that both are active...
 288          */
 289
 290         spin_lock_irq(&twl->lock);
 291         twl->linkstat = linkstat;
 292         if (linkstat == USB_EVENT_ID) {
 293                 twl->otg.default_a = true;
 294                 twl->otg.state = OTG_STATE_A_IDLE;
 295         } else {
 296                 twl->otg.default_a = false;
 297                 twl->otg.state = OTG_STATE_B_IDLE;
 298         }
 299         spin_unlock_irq(&twl->lock);
 300
 301         return linkstat;
 302 }
 303
 304 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
 305 {
 306         twl->usb_mode = mode;
 307
 308         switch (mode) {
 309         case T2_USB_MODE_ULPI:
 310                 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
 311                                         ULPI_IFC_CTRL_CARKITMODE);
 312                 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 313                 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
 314                                         ULPI_FUNC_CTRL_XCVRSEL_MASK |
 315                                         ULPI_FUNC_CTRL_OPMODE_MASK);
 316                 break;
 317         case -1:
 318                 /* FIXME: power on defaults */
 319                 break;
 320         default:
 321                 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
 322                                 mode);
 323                 break;
 324         };
 325 }
 326
 327 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
 328 {
 329         unsigned long timeout;
 330         int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 331
 332         if (val >= 0) {
 333                 if (on) {
 334                         /* enable DPLL to access PHY registers over I2C */
 335                         val |= REQ_PHY_DPLL_CLK;
 336                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 337                                                 (u8)val) < 0);
 338
 339                         timeout = jiffies + HZ;
 340                         while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 341                                                         PHY_DPLL_CLK)
 342                                 && time_before(jiffies, timeout))
 343                                         udelay(10);
 344                         if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 345                                                         PHY_DPLL_CLK))
 346                                 dev_err(twl->dev, "Timeout setting T2 HSUSB "
 347                                                 "PHY DPLL clock\n");
 348                 } else {
 349                         /* let ULPI control the DPLL clock */
 350                         val &= ~REQ_PHY_DPLL_CLK;
 351                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 352                                                 (u8)val) < 0);
 353                 }
 354         }
 355 }
 356
 357 static void __twl4030_phy_power(struct twl4030_usb *twl, int on)
 358 {
 359         u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
 360
 361         if (on)
 362                 pwr &= ~PHY_PWR_PHYPWD;
 363         else
 364                 pwr |= PHY_PWR_PHYPWD;
 365
 366         WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
 367 }
 368
 369 static void twl4030_phy_power(struct twl4030_usb *twl, int on)
 370 {
 371         if (on) {
 372                 regulator_enable(twl->usb3v1);
 373                 regulator_enable(twl->usb1v8);
 374                 /*
 375                  * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
 376                  * in twl4030) resets the VUSB_DEDICATED2 register. This reset
 377                  * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
 378                  * SLEEP. We work around this by clearing the bit after usv3v1
 379                  * is re-activated. This ensures that VUSB3V1 is really active.
 380                  */
 381                 twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
 382                                                         VUSB_DEDICATED2);
 383                 regulator_enable(twl->usb1v5);
 384                 __twl4030_phy_power(twl, 1);
 385                 twl4030_usb_write(twl, PHY_CLK_CTRL,
 386                                   twl4030_usb_read(twl, PHY_CLK_CTRL) |
 387                                         (PHY_CLK_CTRL_CLOCKGATING_EN |
 388                                                 PHY_CLK_CTRL_CLK32K_EN));
 389         } else {
 390                 __twl4030_phy_power(twl, 0);
 391                 regulator_disable(twl->usb1v5);
 392                 regulator_disable(twl->usb1v8);
 393                 regulator_disable(twl->usb3v1);
 394         }
 395 }
 396
 397 static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
 398 {
 399         if (twl->asleep)
 400                 return;
 401
 402         twl4030_phy_power(twl, 0);
 403         twl->asleep = 1;
 404         dev_dbg(twl->dev, "%s\n", __func__);
 405 }
 406
 407 static void __twl4030_phy_resume(struct twl4030_usb *twl)
 408 {
 409         twl4030_phy_power(twl, 1);
 410         twl4030_i2c_access(twl, 1);
 411         twl4030_usb_set_mode(twl, twl->usb_mode);
 412         if (twl->usb_mode == T2_USB_MODE_ULPI)
 413                 twl4030_i2c_access(twl, 0);
 414 }
 415
 416 static void twl4030_phy_resume(struct twl4030_usb *twl)
 417 {
 418         if (!twl->asleep)
 419                 return;
 420         __twl4030_phy_resume(twl);
 421         twl->asleep = 0;
 422         dev_dbg(twl->dev, "%s\n", __func__);
 423 }
 424
 425 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
 426 {
 427         /* Enable writing to power configuration registers */
 428         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 429                         TWL4030_PM_MASTER_KEY_CFG1,
 430                         TWL4030_PM_MASTER_PROTECT_KEY);
 431
 432         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 433                         TWL4030_PM_MASTER_KEY_CFG2,
 434                         TWL4030_PM_MASTER_PROTECT_KEY);
 435
 436         /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/
 437         /*twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/
 438
 439         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
 440         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
 441
 442         /* Initialize 3.1V regulator */
 443         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
 444
 445         twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
 446         if (IS_ERR(twl->usb3v1))
 447                 return -ENODEV;
 448
 449         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
 450
 451         /* Initialize 1.5V regulator */
 452         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
 453
 454         twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
 455         if (IS_ERR(twl->usb1v5))
 456                 goto fail1;
 457
 458         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
 459
 460         /* Initialize 1.8V regulator */
 461         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
 462
 463         twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
 464         if (IS_ERR(twl->usb1v8))
 465                 goto fail2;
 466
 467         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
 468
 469         /* disable access to power configuration registers */
 470         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
 471                         TWL4030_PM_MASTER_PROTECT_KEY);
 472
 473         return 0;
 474
 475 fail2:
 476         regulator_put(twl->usb1v5);
 477         twl->usb1v5 = NULL;
 478 fail1:
 479         regulator_put(twl->usb3v1);
 480         twl->usb3v1 = NULL;
 481         return -ENODEV;
 482 }
 483
 484 static ssize_t twl4030_usb_vbus_show(struct device *dev,
 485                 struct device_attribute *attr, char *buf)
 486 {
 487         struct twl4030_usb *twl = dev_get_drvdata(dev);
 488         unsigned long flags;
 489         int ret = -EINVAL;
 490
 491         spin_lock_irqsave(&twl->lock, flags);
 492         ret = sprintf(buf, "%s\n",
 493                         twl->vbus_supplied ? "on" : "off");
 494         spin_unlock_irqrestore(&twl->lock, flags);
 495
 496         return ret;
 497 }
 498 static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
 499
 500 static ssize_t twl4030_usb_id_show(struct device *dev,
 501                 struct device_attribute *attr, char *buf)
 502 {
 503         int ret;
 504         int n = 0;
 505         struct twl4030_usb *twl = dev_get_drvdata(dev);
 506         twl4030_i2c_access(twl, 1);
 507         ret = twl4030_usb_read(twl, ULPI_OTG_CTRL);
 508         if ((ret < 0) || (!(ret & ULPI_OTG_ID_PULLUP))) {
 509                 /*
 510                  * enable ID pullup so that the id pin state can be measured,
 511                  * seems to be disabled sometimes for some reasons
 512                  */
 513                 dev_dbg(dev, "ULPI_OTG_ID_PULLUP not set (%x)\n", ret);
 514                 twl4030_usb_set_bits(twl, ULPI_OTG_CTRL, ULPI_OTG_ID_PULLUP);
 515                 mdelay(100);
 516         }
 517         ret = twl4030_usb_read(twl, ID_STATUS);
 518         twl4030_i2c_access(twl, 0);
 519         if (ret < 0)
 520                 return ret;
 521         if (ret & ID_RES_FLOAT)
 522                 n = scnprintf(buf, PAGE_SIZE, "%s\n", "floating");
 523         else if (ret & ID_RES_440K)
 524                 n = scnprintf(buf, PAGE_SIZE, "%s\n", "440k");
 525         else if (ret & ID_RES_200K)
 526                 n = scnprintf(buf, PAGE_SIZE, "%s\n", "200k");
 527         else if (ret & ID_RES_102K)
 528                 n = scnprintf(buf, PAGE_SIZE, "%s\n", "102k");
 529         else if (ret & ID_RES_GND)
 530                 n = scnprintf(buf, PAGE_SIZE, "%s\n", "GND");
 531         else
 532                 n = scnprintf(buf, PAGE_SIZE, "unknown: id=0x%x\n", ret);
 533         return n;
 534 }
 535 static DEVICE_ATTR(id, 0444, twl4030_usb_id_show, NULL);
 536
 537 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 538 {
 539         struct twl4030_usb *twl = _twl;
 540         int status;
 541
 542         status = twl4030_usb_linkstat(twl);
 543         if (status >= 0) {
 544                 /* FIXME add a set_power() method so that B-devices can
 545                  * configure the charger appropriately.  It's not always
 546                  * correct to consume VBUS power, and how much current to
 547                  * consume is a function of the USB configuration chosen
 548                  * by the host.
 549                  *
 550                  * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
 551                  * its disconnect() sibling, when changing to/from the
 552                  * USB_LINK_VBUS state.  musb_hdrc won't care until it
 553                  * starts to handle softconnect right.
 554                  */
 555                 if (status == USB_EVENT_NONE)
 556                         twl4030_phy_suspend(twl, 0);
 557                 else
 558                         twl4030_phy_resume(twl);
 559
 560                 atomic_notifier_call_chain(&twl->otg.notifier, status,
 561                                 twl->otg.gadget);
 562         }
 563         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 564
 565         return IRQ_HANDLED;
 566 }
 567
 568 static void twl4030_usb_phy_init(struct twl4030_usb *twl)
 569 {
 570         int status;
 571
 572         /*
 573          * Start in sleep state, we'll get otg.set_suspend(false) call
 574          * and power up when musb runtime_pm enable kicks in.
 575          */
 576         __twl4030_phy_power(twl, 0);
 577         twl->asleep = 1;
 578
 579         status = twl4030_usb_linkstat(twl);
 580         atomic_notifier_call_chain(&twl->otg.notifier, status,
 581                 twl->otg.gadget);
 582
 583         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 584 }
 585
 586 static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
 587 {
 588         struct twl4030_usb *twl = xceiv_to_twl(x);
 589
 590         if (suspend)
 591                 twl4030_phy_suspend(twl, 1);
 592         else
 593                 twl4030_phy_resume(twl);
 594
 595         return 0;
 596 }
 597
 598 static int twl4030_set_peripheral(struct otg_transceiver *x,
 599                 struct usb_gadget *gadget)
 600 {
 601         struct twl4030_usb *twl;
 602
 603         if (!x)
 604                 return -ENODEV;
 605
 606         twl = xceiv_to_twl(x);
 607         twl->otg.gadget = gadget;
 608         if (!gadget)
 609                 twl->otg.state = OTG_STATE_UNDEFINED;
 610
 611         return 0;
 612 }
 613
 614 static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
 615 {
 616         struct twl4030_usb *twl;
 617
 618         if (!x)
 619                 return -ENODEV;
 620
 621         twl = xceiv_to_twl(x);
 622         twl->otg.host = host;
 623         if (!host)
 624                 twl->otg.state = OTG_STATE_UNDEFINED;
 625
 626         return 0;
 627 }
 628
 629 static int __devinit twl4030_usb_probe(struct platform_device *pdev)
 630 {
 631         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
 632         struct twl4030_usb      *twl;
 633         int                     status, err;
 634
 635         if (!pdata) {
 636                 dev_dbg(&pdev->dev, "platform_data not available\n");
 637                 return -EINVAL;
 638         }
 639
 640         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 641         if (!twl)
 642                 return -ENOMEM;
 643
 644         twl->dev                = &pdev->dev;
 645         twl->irq                = platform_get_irq(pdev, 0);
 646         twl->otg.dev            = twl->dev;
 647         twl->otg.label          = "twl4030";
 648         twl->otg.set_host       = twl4030_set_host;
 649         twl->otg.set_peripheral = twl4030_set_peripheral;
 650         twl->otg.set_suspend    = twl4030_set_suspend;
 651         twl->usb_mode           = pdata->usb_mode;
 652         twl->vbus_supplied      = false;
 653         twl->asleep = 1;
 654
 655         /* init spinlock for workqueue */
 656         spin_lock_init(&twl->lock);
 657
 658         err = twl4030_usb_ldo_init(twl);
 659         if (err) {
 660                 dev_err(&pdev->dev, "ldo init failed\n");
 661                 kfree(twl);
 662                 return err;
 663         }
 664         otg_set_transceiver(&twl->otg);
 665
 666         platform_set_drvdata(pdev, twl);
 667         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 668                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 669         if (device_create_file(&pdev->dev, &dev_attr_id))
 670                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 671
 672         ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
 673
 674         /* Our job is to use irqs and status from the power module
 675          * to keep the transceiver disabled when nothing's connected.
 676          *
 677          * FIXME we actually shouldn't start enabling it until the
 678          * USB controller drivers have said they're ready, by calling
 679          * set_host() and/or set_peripheral() ... OTG_capable boards
 680          * need both handles, otherwise just one suffices.
 681          */
 682         twl->irq_enabled = true;
 683         status = request_threaded_irq(twl->irq, NULL, twl4030_usb_irq,
 684                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 685                         "twl4030_usb", twl);
 686         if (status < 0) {
 687                 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
 688                         twl->irq, status);
 689                 kfree(twl);
 690                 return status;
 691         }
 692
 693         twl4030_usb_phy_init(twl);
 694
 695         dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
 696         return 0;
 697 }
 698
 699 static int __exit twl4030_usb_remove(struct platform_device *pdev)
 700 {
 701         struct twl4030_usb *twl = platform_get_drvdata(pdev);
 702         int val;
 703
 704         free_irq(twl->irq, twl);
 705         device_remove_file(twl->dev, &dev_attr_id);
 706         device_remove_file(twl->dev, &dev_attr_vbus);
 707
 708         /* set transceiver mode to power on defaults */
 709         twl4030_usb_set_mode(twl, -1);
 710
 711         /* autogate 60MHz ULPI clock,
 712          * clear dpll clock request for i2c access,
 713          * disable 32KHz
 714          */
 715         val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 716         if (val >= 0) {
 717                 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
 718                 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
 719                 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
 720         }
 721
 722         /* disable complete OTG block */
 723         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 724
 725         if (!twl->asleep)
 726                 twl4030_phy_power(twl, 0);
 727         regulator_put(twl->usb1v5);
 728         regulator_put(twl->usb1v8);
 729         regulator_put(twl->usb3v1);
 730
 731         kfree(twl);
 732
 733         return 0;
 734 }
 735
 736 static struct platform_driver twl4030_usb_driver = {
 737         .probe          = twl4030_usb_probe,
 738         .remove         = __exit_p(twl4030_usb_remove),
 739         .driver         = {
 740                 .name   = "twl4030_usb",
 741                 .owner  = THIS_MODULE,
 742         },
 743 };
 744
 745 static int __init twl4030_usb_init(void)
 746 {
 747         return platform_driver_register(&twl4030_usb_driver);
 748 }
 749 subsys_initcall(twl4030_usb_init);
 750
 751 static void __exit twl4030_usb_exit(void)
 752 {
 753         platform_driver_unregister(&twl4030_usb_driver);
 754 }
 755 module_exit(twl4030_usb_exit);
 756
 757 MODULE_ALIAS("platform:twl4030_usb");
 758 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
 759 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
 760 MODULE_LICENSE("GPL");