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