drivers/i2c/chips/twl4030-usb.c

   1 /*
   2  * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004-2007 Texas Instruments
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  * Current status:
  21  *      - HS USB ULPI mode works.
  22  *      - 3-pin mode support may be added in future.
  23  */
  24
  25
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/time.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/usb.h>
  31
  32 #include <linux/i2c/twl4030.h>
  33
  34 /* Register defines */
  35
  36 #define VENDOR_ID_LO                    0x00
  37 #define VENDOR_ID_HI                    0x01
  38 #define PRODUCT_ID_LO                   0x02
  39 #define PRODUCT_ID_HI                   0x03
  40
  41 #define FUNC_CTRL                       0x04
  42 #define FUNC_CTRL_SET                   0x05
  43 #define FUNC_CTRL_CLR                   0x06
  44 #define FUNC_CTRL_SUSPENDM              (1 << 6)
  45 #define FUNC_CTRL_RESET                 (1 << 5)
  46 #define FUNC_CTRL_OPMODE_MASK           (3 << 3) /* bits 3 and 4 */
  47 #define FUNC_CTRL_OPMODE_NORMAL         (0 << 3)
  48 #define FUNC_CTRL_OPMODE_NONDRIVING     (1 << 3)
  49 #define FUNC_CTRL_OPMODE_DISABLE_BIT_NRZI       (2 << 3)
  50 #define FUNC_CTRL_TERMSELECT            (1 << 2)
  51 #define FUNC_CTRL_XCVRSELECT_MASK       (3 << 0) /* bits 0 and 1 */
  52 #define FUNC_CTRL_XCVRSELECT_HS         (0 << 0)
  53 #define FUNC_CTRL_XCVRSELECT_FS         (1 << 0)
  54 #define FUNC_CTRL_XCVRSELECT_LS         (2 << 0)
  55 #define FUNC_CTRL_XCVRSELECT_FS4LS      (3 << 0)
  56
  57 #define IFC_CTRL                        0x07
  58 #define IFC_CTRL_SET                    0x08
  59 #define IFC_CTRL_CLR                    0x09
  60 #define IFC_CTRL_INTERFACE_PROTECT_DISABLE      (1 << 7)
  61 #define IFC_CTRL_AUTORESUME             (1 << 4)
  62 #define IFC_CTRL_CLOCKSUSPENDM          (1 << 3)
  63 #define IFC_CTRL_CARKITMODE             (1 << 2)
  64 #define IFC_CTRL_FSLSSERIALMODE_3PIN    (1 << 1)
  65
  66 #define OTG_CTRL                        0x0A
  67 #define OTG_CTRL_SET                    0x0B
  68 #define OTG_CTRL_CLR                    0x0C
  69 #define OTG_CTRL_DRVVBUS                (1 << 5)
  70 #define OTG_CTRL_CHRGVBUS               (1 << 4)
  71 #define OTG_CTRL_DISCHRGVBUS            (1 << 3)
  72 #define OTG_CTRL_DMPULLDOWN             (1 << 2)
  73 #define OTG_CTRL_DPPULLDOWN             (1 << 1)
  74 #define OTG_CTRL_IDPULLUP               (1 << 0)
  75
  76 #define USB_INT_EN_RISE                 0x0D
  77 #define USB_INT_EN_RISE_SET             0x0E
  78 #define USB_INT_EN_RISE_CLR             0x0F
  79 #define USB_INT_EN_FALL                 0x10
  80 #define USB_INT_EN_FALL_SET             0x11
  81 #define USB_INT_EN_FALL_CLR             0x12
  82 #define USB_INT_STS                     0x13
  83 #define USB_INT_LATCH                   0x14
  84 #define USB_INT_IDGND                   (1 << 4)
  85 #define USB_INT_SESSEND                 (1 << 3)
  86 #define USB_INT_SESSVALID               (1 << 2)
  87 #define USB_INT_VBUSVALID               (1 << 1)
  88 #define USB_INT_HOSTDISCONNECT          (1 << 0)
  89
  90 #define CARKIT_CTRL                     0x19
  91 #define CARKIT_CTRL_SET                 0x1A
  92 #define CARKIT_CTRL_CLR                 0x1B
  93 #define CARKIT_CTRL_MICEN               (1 << 6)
  94 #define CARKIT_CTRL_SPKRIGHTEN          (1 << 5)
  95 #define CARKIT_CTRL_SPKLEFTEN           (1 << 4)
  96 #define CARKIT_CTRL_RXDEN               (1 << 3)
  97 #define CARKIT_CTRL_TXDEN               (1 << 2)
  98 #define CARKIT_CTRL_IDGNDDRV            (1 << 1)
  99 #define CARKIT_CTRL_CARKITPWR           (1 << 0)
 100 #define CARKIT_PLS_CTRL                 0x22
 101 #define CARKIT_PLS_CTRL_SET             0x23
 102 #define CARKIT_PLS_CTRL_CLR             0x24
 103 #define CARKIT_PLS_CTRL_SPKRRIGHT_BIASEN        (1 << 3)
 104 #define CARKIT_PLS_CTRL_SPKRLEFT_BIASEN (1 << 2)
 105 #define CARKIT_PLS_CTRL_RXPLSEN         (1 << 1)
 106 #define CARKIT_PLS_CTRL_TXPLSEN         (1 << 0)
 107
 108 #define MCPC_CTRL                       0x30
 109 #define MCPC_CTRL_SET                   0x31
 110 #define MCPC_CTRL_CLR                   0x32
 111 #define MCPC_CTRL_RTSOL                 (1 << 7)
 112 #define MCPC_CTRL_EXTSWR                (1 << 6)
 113 #define MCPC_CTRL_EXTSWC                (1 << 5)
 114 #define MCPC_CTRL_VOICESW               (1 << 4)
 115 #define MCPC_CTRL_OUT64K                (1 << 3)
 116 #define MCPC_CTRL_RTSCTSSW              (1 << 2)
 117 #define MCPC_CTRL_HS_UART               (1 << 0)
 118
 119 #define MCPC_IO_CTRL                    0x33
 120 #define MCPC_IO_CTRL_SET                0x34
 121 #define MCPC_IO_CTRL_CLR                0x35
 122 #define MCPC_IO_CTRL_MICBIASEN          (1 << 5)
 123 #define MCPC_IO_CTRL_CTS_NPU            (1 << 4)
 124 #define MCPC_IO_CTRL_RXD_PU             (1 << 3)
 125 #define MCPC_IO_CTRL_TXDTYP             (1 << 2)
 126 #define MCPC_IO_CTRL_CTSTYP             (1 << 1)
 127 #define MCPC_IO_CTRL_RTSTYP             (1 << 0)
 128
 129 #define MCPC_CTRL2                      0x36
 130 #define MCPC_CTRL2_SET                  0x37
 131 #define MCPC_CTRL2_CLR                  0x38
 132 #define MCPC_CTRL2_MCPC_CK_EN           (1 << 0)
 133
 134 #define OTHER_FUNC_CTRL                 0x80
 135 #define OTHER_FUNC_CTRL_SET             0x81
 136 #define OTHER_FUNC_CTRL_CLR             0x82
 137 #define OTHER_FUNC_CTRL_BDIS_ACON_EN    (1 << 4)
 138 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE   (1 << 2)
 139
 140 #define OTHER_IFC_CTRL                  0x83
 141 #define OTHER_IFC_CTRL_SET              0x84
 142 #define OTHER_IFC_CTRL_CLR              0x85
 143 #define OTHER_IFC_CTRL_OE_INT_EN        (1 << 6)
 144 #define OTHER_IFC_CTRL_CEA2011_MODE     (1 << 5)
 145 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN      (1 << 4)
 146 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT       (1 << 3)
 147 #define OTHER_IFC_CTRL_HIZ_ULPI         (1 << 2)
 148 #define OTHER_IFC_CTRL_ALT_INT_REROUTE  (1 << 0)
 149
 150 #define OTHER_INT_EN_RISE               0x86
 151 #define OTHER_INT_EN_RISE_SET           0x87
 152 #define OTHER_INT_EN_RISE_CLR           0x88
 153 #define OTHER_INT_EN_FALL               0x89
 154 #define OTHER_INT_EN_FALL_SET           0x8A
 155 #define OTHER_INT_EN_FALL_CLR           0x8B
 156 #define OTHER_INT_STS                   0x8C
 157 #define OTHER_INT_LATCH                 0x8D
 158 #define OTHER_INT_VB_SESS_VLD           (1 << 7)
 159 #define OTHER_INT_DM_HI                 (1 << 6) /* not valid for "latch" reg */
 160 #define OTHER_INT_DP_HI                 (1 << 5) /* not valid for "latch" reg */
 161 #define OTHER_INT_BDIS_ACON             (1 << 3) /* not valid for "fall" regs */
 162 #define OTHER_INT_MANU                  (1 << 1)
 163 #define OTHER_INT_ABNORMAL_STRESS       (1 << 0)
 164
 165 #define ID_STATUS                       0x96
 166 #define ID_RES_FLOAT                    (1 << 4)
 167 #define ID_RES_440K                     (1 << 3)
 168 #define ID_RES_200K                     (1 << 2)
 169 #define ID_RES_102K                     (1 << 1)
 170 #define ID_RES_GND                      (1 << 0)
 171
 172 #define POWER_CTRL                      0xAC
 173 #define POWER_CTRL_SET                  0xAD
 174 #define POWER_CTRL_CLR                  0xAE
 175 #define POWER_CTRL_OTG_ENAB             (1 << 5)
 176
 177 #define OTHER_IFC_CTRL2                 0xAF
 178 #define OTHER_IFC_CTRL2_SET             0xB0
 179 #define OTHER_IFC_CTRL2_CLR             0xB1
 180 #define OTHER_IFC_CTRL2_ULPI_STP_LOW    (1 << 4)
 181 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL   (1 << 3)
 182 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430  (1 << 2)
 183 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK     (3 << 0) /* bits 0 and 1 */
 184 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N    (0 << 0)
 185 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N    (1 << 0)
 186
 187 #define REG_CTRL_EN                     0xB2
 188 #define REG_CTRL_EN_SET                 0xB3
 189 #define REG_CTRL_EN_CLR                 0xB4
 190 #define REG_CTRL_ERROR                  0xB5
 191 #define ULPI_I2C_CONFLICT_INTEN         (1 << 0)
 192
 193 #define OTHER_FUNC_CTRL2                0xB8
 194 #define OTHER_FUNC_CTRL2_SET            0xB9
 195 #define OTHER_FUNC_CTRL2_CLR            0xBA
 196 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN  (1 << 0)
 197
 198 /* following registers do not have separate _clr and _set registers */
 199 #define VBUS_DEBOUNCE                   0xC0
 200 #define ID_DEBOUNCE                     0xC1
 201 #define VBAT_TIMER                      0xD3
 202 #define PHY_PWR_CTRL                    0xFD
 203 #define PHY_PWR_PHYPWD                  (1 << 0)
 204 #define PHY_CLK_CTRL                    0xFE
 205 #define PHY_CLK_CTRL_CLOCKGATING_EN     (1 << 2)
 206 #define PHY_CLK_CTRL_CLK32K_EN          (1 << 1)
 207 #define REQ_PHY_DPLL_CLK                (1 << 0)
 208 #define PHY_CLK_CTRL_STS                0xFF
 209 #define PHY_DPLL_CLK                    (1 << 0)
 210
 211 /* In module TWL4030_MODULE_PM_MASTER */
 212 #define PROTECT_KEY                     0x0E
 213
 214 /* In module TWL4030_MODULE_PM_RECEIVER */
 215 #define VUSB_DEDICATED1                 0x7D
 216 #define VUSB_DEDICATED2                 0x7E
 217 #define VUSB1V5_DEV_GRP                 0x71
 218 #define VUSB1V5_TYPE                    0x72
 219 #define VUSB1V5_REMAP                   0x73
 220 #define VUSB1V8_DEV_GRP                 0x74
 221 #define VUSB1V8_TYPE                    0x75
 222 #define VUSB1V8_REMAP                   0x76
 223 #define VUSB3V1_DEV_GRP                 0x77
 224 #define VUSB3V1_TYPE                    0x78
 225 #define VUSB3V1_REMAP                   0x79
 226
 227 #define ID_STATUS                       0x96
 228 #define ID_RES_FLOAT                    (1 << 4) /* mini-B */
 229 #define ID_RES_440K                     (1 << 3) /* type 2 charger */
 230 #define ID_RES_200K                     (1 << 2) /* 5-wire carkit or
 231                                                     type 1 charger */
 232 #define ID_RES_102K                     (1 << 1) /* phone */
 233 #define ID_RES_GND                      (1 << 0) /* mini-A */
 234
 235 /* In module TWL4030_MODULE_INTBR */
 236 #define PMBR1                           0x0D
 237 #define GPIO_USB_4PIN_ULPI_2430C        (3 << 0)
 238
 239 /* In module TWL4030_MODULE_INT */
 240 #define REG_PWR_ISR1                    0x00
 241 #define REG_PWR_IMR1                    0x01
 242 #define USB_PRES                        (1 << 2)
 243 #define REG_PWR_EDR1                    0x05
 244 #define USB_PRES_FALLING                (1 << 4)
 245 #define USB_PRES_RISING                 (1 << 5)
 246 #define REG_PWR_SIH_CTRL                0x07
 247 #define COR                             (1 << 2)
 248
 249 /*-------------------------------------------------------------------------*/
 250
 251 static int twl4030_i2c_write_u8_verify(u8 module, u8 data, u8 address)
 252 {
 253         u8 check;
 254
 255         if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
 256             (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
 257                                                 (check == data))
 258                 return 0;
 259         /* Failed once: Try again */
 260         if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
 261             (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
 262                                                 (check == data))
 263                 return 0;
 264         /* Failed again: Return error */
 265         return -EBUSY;
 266 }
 267
 268 #define twl4030_usb_write_verify(address, data) \
 269         twl4030_i2c_write_u8_verify(TWL4030_MODULE_USB, (data), (address))
 270
 271 static inline int twl4030_usb_write(u8 address, u8 data)
 272 {
 273         int ret = 0;
 274         ret = twl4030_i2c_write_u8(TWL4030_MODULE_USB, data, address);
 275         if (ret >= 0) {
 276 #if 0   /* debug */
 277                 u8 data1;
 278                 if (twl4030_i2c_read_u8(TWL4030_MODULE_USB, &data1,
 279                                         address) < 0)
 280                         printk(KERN_ERR "re-read failed\n");
 281                 else
 282                         printk(KERN_INFO
 283                                "Write %s wrote %x read %x from reg %x\n",
 284                                (data1 == data) ? "succeed" : "mismatch",
 285                                data, data1, address);
 286 #endif
 287         } else {
 288                 printk(KERN_WARNING
 289                         "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
 290         }
 291         return ret;
 292 }
 293
 294 static inline int twl4030_usb_read(u8 address)
 295 {
 296         u8 data;
 297         int ret = 0;
 298         ret = twl4030_i2c_read_u8(TWL4030_MODULE_USB, &data, address);
 299         if (ret >= 0) {
 300                 ret = data;
 301         } else {
 302                 printk(KERN_WARNING
 303                         "TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
 304         }
 305         return ret;
 306 }
 307
 308 /*-------------------------------------------------------------------------*/
 309
 310 struct twl4030_usb {
 311         int                     irq;
 312         u8                      usb_mode;       /* pin configuration */
 313 #define T2_USB_MODE_ULPI                1
 314 /* #define T2_USB_MODE_CEA2011_3PIN     2 */
 315         u8                      asleep;
 316 };
 317
 318 static struct twl4030_usb *the_transceiver;
 319
 320 /*-------------------------------------------------------------------------*/
 321
 322 static inline int
 323 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 324 {
 325         return twl4030_usb_write(reg + 1, bits);
 326 }
 327
 328 static inline int
 329 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 330 {
 331         return twl4030_usb_write(reg + 2, bits);
 332 }
 333
 334 /*-------------------------------------------------------------------------*/
 335
 336 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
 337 {
 338         twl->usb_mode = mode;
 339
 340         switch (mode) {
 341         case T2_USB_MODE_ULPI:
 342                 twl4030_usb_clear_bits(twl, IFC_CTRL, IFC_CTRL_CARKITMODE);
 343                 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 344                 twl4030_usb_clear_bits(twl, FUNC_CTRL,
 345                                         FUNC_CTRL_XCVRSELECT_MASK |
 346                                         FUNC_CTRL_OPMODE_MASK);
 347                 break;
 348 /*
 349         case T2_USB_MODE_CEA2011_3PIN:
 350                 twl4030_cea2011_3_pin_FS_setup(twl);
 351                 break;
 352 */
 353         default:
 354                 /* FIXME: power on defaults */
 355                 break;
 356         };
 357 }
 358
 359 #ifdef CONFIG_TWL4030_USB_HS_ULPI
 360 static void hs_usb_init(struct twl4030_usb *twl)
 361 {
 362         twl->usb_mode = T2_USB_MODE_ULPI;
 363         return;
 364 }
 365
 366 #endif
 367
 368 static void twl4030_i2c_access(int on)
 369 {
 370         unsigned long timeout;
 371         int val = twl4030_usb_read(PHY_CLK_CTRL);
 372
 373         if (val >= 0) {
 374                 if (on) {
 375                         /* enable DPLL to access PHY registers over I2C */
 376                         val |= REQ_PHY_DPLL_CLK;
 377                         if (twl4030_usb_write_verify(PHY_CLK_CTRL,
 378                                                                 (u8)val) < 0) {
 379                                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 380                                                 " line %d\n", __LINE__);
 381                                 return;
 382                         }
 383
 384                         timeout = jiffies + HZ;
 385                         while (!(twl4030_usb_read(PHY_CLK_CTRL_STS) &
 386                                                         PHY_DPLL_CLK)
 387                                 && time_before(jiffies, timeout))
 388                                         udelay(10);
 389                         if (!(twl4030_usb_read(PHY_CLK_CTRL_STS) &
 390                                                         PHY_DPLL_CLK))
 391                                 printk(KERN_ERR "Timeout setting T2 HSUSB "
 392                                                 "PHY DPLL clock\n");
 393                 } else {
 394                         /* let ULPI control the DPLL clock */
 395                         val &= ~REQ_PHY_DPLL_CLK;
 396                         if (twl4030_usb_write_verify(PHY_CLK_CTRL,
 397                                                                 (u8)val) < 0) {
 398                                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 399                                                 " line %d\n", __LINE__);
 400                         }
 401                 }
 402         }
 403         return;
 404 }
 405
 406 static void usb_irq_enable(int rising, int falling)
 407 {
 408         u8 val;
 409
 410         /* edge setup */
 411         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_EDR1) < 0) {
 412                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 413                                 " line %d\n", __LINE__);
 414                 return;
 415         }
 416         val &= ~(USB_PRES_RISING | USB_PRES_FALLING);
 417         if (rising)
 418                 val = val | USB_PRES_RISING;
 419         if (falling)
 420                 val = val | USB_PRES_FALLING;
 421         if (twl4030_i2c_write_u8_verify(TWL4030_MODULE_INT, val,
 422                                                         REG_PWR_EDR1) < 0) {
 423                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 424                                 " line %d\n", __LINE__);
 425                 return;
 426         }
 427
 428         /* un-mask interrupt */
 429         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_IMR1) < 0) {
 430                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 431                                 " line %d\n", __LINE__);
 432                 return;
 433         }
 434         val &= ~USB_PRES;
 435         if (twl4030_i2c_write_u8_verify(TWL4030_MODULE_INT, val,
 436                                                         REG_PWR_IMR1) < 0)
 437                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 438                                 " line %d\n", __LINE__);
 439
 440         return;
 441 }
 442
 443 static void usb_irq_disable(void)
 444 {
 445         u8 val;
 446
 447         /* undo edge setup */
 448         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_EDR1) < 0) {
 449                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 450                                 " line %d\n", __LINE__);
 451                 return;
 452         }
 453         val &= ~(USB_PRES_RISING | USB_PRES_FALLING);
 454         if (twl4030_i2c_write_u8_verify(TWL4030_MODULE_INT, val,
 455                                                         REG_PWR_EDR1) < 0) {
 456                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 457                                 " line %d\n", __LINE__);
 458                 return;
 459         }
 460
 461         /* mask interrupt */
 462         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_IMR1) < 0) {
 463                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 464                                 " line %d\n", __LINE__);
 465                 return;
 466         }
 467         val |= USB_PRES;
 468         if (twl4030_i2c_write_u8_verify(TWL4030_MODULE_INT, val,
 469                                                         REG_PWR_IMR1) < 0)
 470                 printk(KERN_ERR "twl4030_usb: i2c write failed,"
 471                                 " line %d\n", __LINE__);
 472
 473         return;
 474 }
 475
 476 void twl4030_phy_suspend(int controller_off);
 477 void twl4030_phy_resume(void);
 478
 479 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 480 {
 481         int ret = IRQ_NONE;
 482         u8 val;
 483
 484         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_ISR1) < 0) {
 485                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 486                                 " line %d\n", __LINE__);
 487                 goto done;
 488         }
 489
 490         /* this interrupt line may be shared */
 491         if (!(val & USB_PRES))
 492                 goto done;
 493
 494         /* clear the interrupt */
 495         twl4030_i2c_write_u8(TWL4030_MODULE_INT, USB_PRES, REG_PWR_ISR1);
 496
 497         /* action based on cable attach or detach */
 498         if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_EDR1) < 0) {
 499                 printk(KERN_ERR "twl4030_usb: i2c read failed,"
 500                                 " line %d\n", __LINE__);
 501                 goto done;
 502         }
 503
 504         if (val & USB_PRES_RISING)
 505                 twl4030_phy_resume();
 506         else
 507                 twl4030_phy_suspend(0);
 508
 509         ret = IRQ_HANDLED;
 510
 511 done:
 512         return ret;
 513 }
 514
 515 static void twl4030_phy_power(struct twl4030_usb *twl, int on)
 516 {
 517         u8 pwr;
 518
 519         pwr = twl4030_usb_read(PHY_PWR_CTRL);
 520         if (on) {
 521                 pwr &= ~PHY_PWR_PHYPWD;
 522                 if (twl4030_usb_write_verify(PHY_PWR_CTRL, pwr) < 0) {
 523                         printk(KERN_ERR "twl4030_usb: i2c write failed,"
 524                                         " line %d\n", __LINE__);
 525                         return;
 526                 }
 527                 twl4030_usb_write(PHY_CLK_CTRL,
 528                                   twl4030_usb_read(PHY_CLK_CTRL) |
 529                                         (PHY_CLK_CTRL_CLOCKGATING_EN |
 530                                                 PHY_CLK_CTRL_CLK32K_EN));
 531         } else  {
 532                 pwr |= PHY_PWR_PHYPWD;
 533                 if (twl4030_usb_write_verify(PHY_PWR_CTRL, pwr) < 0) {
 534                         printk(KERN_ERR "twl4030_usb: i2c write failed,"
 535                                         " line %d\n", __LINE__);
 536                 }
 537         }
 538         return;
 539 }
 540
 541 static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
 542 {
 543         /* Enable writing to power configuration registers */
 544         twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
 545         twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY);
 546
 547         /* put VUSB3V1 LDO in active state */
 548         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
 549
 550         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
 551         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
 552
 553         /* turn on 3.1V regulator */
 554         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
 555         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
 556
 557         /* turn on 1.5V regulator */
 558         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
 559         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
 560
 561         /* turn on 1.8V regulator */
 562         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
 563         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
 564
 565         /* disable access to power configuration registers */
 566         twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, PROTECT_KEY);
 567 }
 568
 569 void twl4030_phy_suspend(int controller_off)
 570 {
 571         struct twl4030_usb *twl = the_transceiver;
 572
 573         if (controller_off)
 574                 usb_irq_disable();
 575
 576         if (twl->asleep)
 577                 return;
 578
 579         if (!controller_off)
 580                 /* enable rising edge interrupt to detect cable attach */
 581                 usb_irq_enable(1, 0);
 582
 583         twl4030_phy_power(twl, 0);
 584         twl->asleep = 1;
 585         return;
 586 }
 587 EXPORT_SYMBOL(twl4030_phy_suspend);
 588
 589
 590 void twl4030_phy_resume(void)
 591 {
 592         struct twl4030_usb *twl = the_transceiver;
 593
 594         if (!twl->asleep)
 595                 return;
 596
 597         /* enable falling edge interrupt to detect cable detach */
 598         usb_irq_enable(0, 1);
 599
 600         twl4030_phy_power(twl, 1);
 601         twl4030_i2c_access(1);
 602         twl4030_usb_set_mode(twl, twl->usb_mode);
 603         if (twl->usb_mode == T2_USB_MODE_ULPI)
 604                 twl4030_i2c_access(0);
 605         twl->asleep = 0;
 606         return;
 607 }
 608 EXPORT_SYMBOL(twl4030_phy_resume);
 609
 610
 611 static int __init twl4030_usb_init(void)
 612 {
 613         struct twl4030_usb      *twl;
 614         int status;
 615
 616         if (the_transceiver)
 617                 return 0;
 618
 619         twl = kcalloc(1, sizeof *twl, GFP_KERNEL);
 620         if (!twl)
 621                 return 0;
 622
 623         the_transceiver = twl;
 624
 625         twl->irq = TWL4030_MODIRQ_PWR;
 626
 627         usb_irq_disable();
 628         status = request_irq(twl->irq, twl4030_usb_irq,
 629                 IRQF_DISABLED | IRQF_SHARED, "twl4030_usb", twl);
 630         if (status < 0) {
 631                 printk(KERN_DEBUG "can't get IRQ %d, err %d\n",
 632                         twl->irq, status);
 633                 kfree(twl);
 634                 return -ENODEV;
 635         }
 636
 637 #if defined(CONFIG_TWL4030_USB_HS_ULPI)
 638         hs_usb_init(twl);
 639 #endif
 640         twl4030_usb_ldo_init(twl);
 641         twl4030_phy_power(twl, 1);
 642         twl4030_i2c_access(1);
 643         twl4030_usb_set_mode(twl, twl->usb_mode);
 644         if (twl->usb_mode == T2_USB_MODE_ULPI)
 645                 twl4030_i2c_access(0);
 646
 647         twl->asleep = 0;
 648
 649         if (twl->usb_mode == T2_USB_MODE_ULPI)
 650                 twl4030_phy_suspend(1);
 651
 652         printk(KERN_INFO "Initialized TWL4030 USB module");
 653
 654         return 0;
 655 }
 656
 657
 658 static void __exit twl4030_usb_exit(void)
 659 {
 660         struct twl4030_usb *twl = the_transceiver;
 661         int val;
 662
 663         usb_irq_disable();
 664         free_irq(twl->irq, twl);
 665
 666         /* set transceiver mode to power on defaults */
 667         twl4030_usb_set_mode(twl, -1);
 668
 669         /* autogate 60MHz ULPI clock,
 670          * clear dpll clock request for i2c access,
 671          * disable 32KHz
 672          */
 673         val = twl4030_usb_read(PHY_CLK_CTRL);
 674         if (val >= 0) {
 675                 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
 676                 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
 677                 twl4030_usb_write(PHY_CLK_CTRL, (u8)val);
 678         }
 679
 680         /* disable complete OTG block */
 681         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 682
 683         twl4030_phy_power(twl, 0);
 684
 685         kfree(twl);
 686 }
 687
 688 subsys_initcall(twl4030_usb_init);
 689 module_exit(twl4030_usb_exit);
 690
 691 MODULE_AUTHOR("Texas Instruments, Inc.");
 692 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
 693 MODULE_LICENSE("GPL");