drivers/i2c/chips/isp1301_omap.c

   1 /*
   2  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004 Texas Instruments
   5  * Copyright (C) 2004 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21 #undef  DEBUG
  22 #undef  VERBOSE
  23
  24 #include <linux/config.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/device.h>
  31 #include <linux/usb_ch9.h>
  32 #include <linux/usb_gadget.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb_otg.h>
  35 #include <linux/i2c.h>
  36 #include <linux/workqueue.h>
  37
  38 #include <asm/irq.h>
  39 #include <asm/arch/usb.h>
  40
  41
  42 #ifndef DEBUG
  43 #undef  VERBOSE
  44 #endif
  45
  46
  47 #define DRIVER_VERSION  "24 August 2004"
  48 #define DRIVER_NAME     (isp1301_driver.name)
  49
  50 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  51 MODULE_LICENSE("GPL");
  52
  53 struct isp1301 {
  54         struct otg_transceiver  otg;
  55         struct i2c_client       client;
  56         void                    (*i2c_release)(struct device *dev);
  57
  58         int                     irq;
  59
  60         u32                     last_otg_ctrl;
  61         unsigned                working:1;
  62
  63         struct timer_list       timer;
  64
  65         /* use keventd context to change the state for us */
  66         struct work_struct      work;
  67
  68         unsigned long           todo;
  69 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  70 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  71 #               define WORK_HOST_RESUME 4       /* resume host */
  72 #               define WORK_TIMER       6       /* timer fired */
  73 #               define WORK_STOP        7       /* don't resubmit */
  74 };
  75
  76
  77 /* bits in OTG_CTRL_REG */
  78
  79 #define OTG_XCEIV_OUTPUTS \
  80         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  81 #define OTG_XCEIV_INPUTS \
  82         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  83 #define OTG_CTRL_BITS \
  84         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  85         /* and OTG_PULLUP is sometimes written */
  86
  87 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  88         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  89         OTG_CTRL_BITS)
  90
  91
  92 /*-------------------------------------------------------------------------*/
  93
  94 #ifdef  CONFIG_MACH_OMAP_H2
  95
  96 /* board-specific PM hooks */
  97
  98 #include <asm/arch/gpio.h>
  99 #include <asm/arch/mux.h>
 100 #include <asm/mach-types.h>
 101
 102
 103 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 104
 105 #include <asm/arch/tps65010.h>
 106
 107 #else
 108
 109 static inline int tps65010_set_vbus_draw(unsigned mA)
 110 {
 111         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 112         return 0;
 113 }
 114
 115 #endif
 116
 117 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 118 {
 119         int status = tps65010_set_vbus_draw(mA);
 120         if (status < 0)
 121                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 122 }
 123
 124 static void enable_vbus_source(struct isp1301 *isp)
 125 {
 126         /* this board won't supply more than 8mA vbus power.
 127          * some boards can switch a 100ma "unit load" (or more).
 128          */
 129 }
 130
 131
 132 /* products will deliver OTG messages with LEDs, GUI, etc */
 133 static inline void notresponding(struct isp1301 *isp)
 134 {
 135         printk(KERN_NOTICE "OTG device not responding.\n");
 136 }
 137
 138
 139 #endif
 140
 141 /*-------------------------------------------------------------------------*/
 142
 143 /* only two addresses possible */
 144 #define ISP_BASE                0x2c
 145 static unsigned short normal_i2c[] = {
 146         ISP_BASE, ISP_BASE + 1,
 147         I2C_CLIENT_END };
 148 static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
 149
 150 I2C_CLIENT_INSMOD;
 151
 152 static struct i2c_driver isp1301_driver;
 153
 154 /* smbus apis are used for portability */
 155
 156 static inline u8
 157 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 158 {
 159         return i2c_smbus_read_byte_data(&isp->client, reg + 0);
 160 }
 161
 162 static inline int
 163 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 164 {
 165         return i2c_smbus_read_word_data(&isp->client, reg);
 166 }
 167
 168 static inline int
 169 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 170 {
 171         return i2c_smbus_write_byte_data(&isp->client, reg + 0, bits);
 172 }
 173
 174 static inline int
 175 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 176 {
 177         return i2c_smbus_write_byte_data(&isp->client, reg + 1, bits);
 178 }
 179
 180 /*-------------------------------------------------------------------------*/
 181
 182 /* identification */
 183 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 184 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 185 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 186
 187 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 188 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 189
 190 /* operational registers */
 191 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 192 #       define  MC1_SPEED_REG           (1 << 0)
 193 #       define  MC1_SUSPEND_REG         (1 << 1)
 194 #       define  MC1_DAT_SE0             (1 << 2)
 195 #       define  MC1_TRANSPARENT         (1 << 3)
 196 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 197 #       define  MC1_OE_INT_EN           (1 << 5)
 198 #       define  MC1_UART_EN             (1 << 6)
 199 #       define  MC1_MASK                0x7f
 200 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 201 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 202 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 203 #       define  MC2_BI_DI               (1 << 2)
 204 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 205 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 206 #       define  MC2_AUDIO_EN            (1 << 5)
 207 #       define  MC2_PSW_EN              (1 << 6)
 208 #       define  MC2_EN2V7               (1 << 7)
 209 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 210 #       define  OTG1_DP_PULLUP          (1 << 0)
 211 #       define  OTG1_DM_PULLUP          (1 << 1)
 212 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 213 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 214 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 215 #       define  OTG1_VBUS_DRV           (1 << 5)
 216 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 217 #       define  OTG1_VBUS_CHRG          (1 << 7)
 218 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 219 #       define  OTG_B_SESS_END          (1 << 6)
 220 #       define  OTG_B_SESS_VLD          (1 << 7)
 221
 222 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 223 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 224
 225 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 226 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 227
 228 /* same bitfields in all interrupt registers */
 229 #       define  INTR_VBUS_VLD           (1 << 0)
 230 #       define  INTR_SESS_VLD           (1 << 1)
 231 #       define  INTR_DP_HI              (1 << 2)
 232 #       define  INTR_ID_GND             (1 << 3)
 233 #       define  INTR_DM_HI              (1 << 4)
 234 #       define  INTR_ID_FLOAT           (1 << 5)
 235 #       define  INTR_BDIS_ACON          (1 << 6)
 236 #       define  INTR_CR_INT             (1 << 7)
 237
 238 /*-------------------------------------------------------------------------*/
 239
 240 static const char *state_string(enum usb_otg_state state)
 241 {
 242         switch (state) {
 243         case OTG_STATE_A_IDLE:          return "a_idle";
 244         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 245         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 246         case OTG_STATE_A_HOST:          return "a_host";
 247         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 248         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 249         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 250         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 251         case OTG_STATE_B_IDLE:          return "b_idle";
 252         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 253         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 254         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 255         case OTG_STATE_B_HOST:          return "b_host";
 256         default:                        return "UNDEFINED";
 257         }
 258 }
 259
 260 static inline const char *state_name(struct isp1301 *isp)
 261 {
 262         return state_string(isp->otg.state);
 263 }
 264
 265 #ifdef  VERBOSE
 266 #define dev_vdbg                        dev_dbg
 267 #else
 268 #define dev_vdbg(dev, fmt, arg...)      do{}while(0)
 269 #endif
 270
 271 /*-------------------------------------------------------------------------*/
 272
 273 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 274  * not everything is guarded by board-specific checks, or even using
 275  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 276  *
 277  * ALSO:  this currently doesn't use ISP1301 low-power modes
 278  * while OTG is running.
 279  */
 280
 281 static void power_down(struct isp1301 *isp)
 282 {
 283         isp->otg.state = OTG_STATE_UNDEFINED;
 284
 285         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 286         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
 287
 288         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 289         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 290 }
 291
 292 static void power_up(struct isp1301 *isp)
 293 {
 294         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 295         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
 296
 297         /* do this only when cpu is driving transceiver,
 298          * so host won't see a low speed device...
 299          */
 300         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 301 }
 302
 303 #define NO_HOST_SUSPEND
 304
 305 static int host_suspend(struct isp1301 *isp)
 306 {
 307 #ifdef  NO_HOST_SUSPEND
 308         return 0;
 309 #else
 310         struct device   *dev;
 311
 312         if (!isp->otg.host)
 313                 return -ENODEV;
 314
 315         /* Currently ASSUMES only the OTG port matters;
 316          * other ports could be active...
 317          */
 318         dev = isp->otg.host->controller;
 319         return dev->driver->suspend(dev, 3, 0);
 320 #endif
 321 }
 322
 323 static int host_resume(struct isp1301 *isp)
 324 {
 325 #ifdef  NO_HOST_SUSPEND
 326         return 0;
 327 #else
 328         struct device   *dev;
 329
 330         if (!isp->otg.host)
 331                 return -ENODEV;
 332
 333         dev = isp->otg.host->controller;
 334         return dev->driver->resume(dev, 0);
 335 #endif
 336 }
 337
 338 static int gadget_suspend(struct isp1301 *isp)
 339 {
 340         isp->otg.gadget->b_hnp_enable = 0;
 341         isp->otg.gadget->a_hnp_support = 0;
 342         isp->otg.gadget->a_alt_hnp_support = 0;
 343         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 344 }
 345
 346 /*-------------------------------------------------------------------------*/
 347
 348 #define TIMER_MINUTES   10
 349 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 350
 351 /* Almost all our I2C messaging comes from a work queue's task context.
 352  * NOTE: guaranteeing certain response times might mean we shouldn't
 353  * share keventd's work queue; a realtime task might be safest.
 354  */
 355 void
 356 isp1301_defer_work(struct isp1301 *isp, int work)
 357 {
 358         int status;
 359
 360         if (isp && !test_and_set_bit(work, &isp->todo)) {
 361                 (void) get_device(&isp->client.dev);
 362                 status = schedule_work(&isp->work);
 363                 if (!status && !isp->working)
 364                         dev_vdbg(&isp->client.dev,
 365                                 "work item %d may be lost\n", work);
 366         }
 367 }
 368
 369 /* called from irq handlers */
 370 static void a_idle(struct isp1301 *isp, const char *tag)
 371 {
 372         if (isp->otg.state == OTG_STATE_A_IDLE)
 373                 return;
 374
 375         isp->otg.default_a = 1;
 376         if (isp->otg.host) {
 377                 isp->otg.host->is_b_host = 0;
 378                 host_suspend(isp);
 379         }
 380         if (isp->otg.gadget) {
 381                 isp->otg.gadget->is_a_peripheral = 1;
 382                 gadget_suspend(isp);
 383         }
 384         isp->otg.state = OTG_STATE_A_IDLE;
 385         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 386         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 387 }
 388
 389 /* called from irq handlers */
 390 static void b_idle(struct isp1301 *isp, const char *tag)
 391 {
 392         if (isp->otg.state == OTG_STATE_B_IDLE)
 393                 return;
 394
 395         isp->otg.default_a = 0;
 396         if (isp->otg.host) {
 397                 isp->otg.host->is_b_host = 1;
 398                 host_suspend(isp);
 399         }
 400         if (isp->otg.gadget) {
 401                 isp->otg.gadget->is_a_peripheral = 0;
 402                 gadget_suspend(isp);
 403         }
 404         isp->otg.state = OTG_STATE_B_IDLE;
 405         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 406         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 407 }
 408
 409 static void
 410 dump_regs(struct isp1301 *isp, const char *label)
 411 {
 412 #ifdef  DEBUG
 413         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 414         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 415         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 416
 417         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 418                 OTG_CTRL_REG, label, state_name(isp),
 419                 ctrl, status, src);
 420         /* mode control and irq enables don't change much */
 421 #endif
 422 }
 423
 424 /*-------------------------------------------------------------------------*/
 425
 426 #ifdef  CONFIG_USB_OTG
 427
 428 /*
 429  * The OMAP OTG controller handles most of the OTG state transitions.
 430  *
 431  * We translate isp1301 outputs (mostly voltage comparator status) into
 432  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 433  * flags into isp1301 inputs ... and infer state transitions.
 434  */
 435
 436 #ifdef  VERBOSE
 437
 438 static void check_state(struct isp1301 *isp, const char *tag)
 439 {
 440         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 441         u8                      fsm = OTG_TEST_REG & 0x0ff;
 442         unsigned                extra = 0;
 443
 444         switch (fsm) {
 445
 446         /* default-b */
 447         case 0x0:
 448                 state = OTG_STATE_B_IDLE;
 449                 break;
 450         case 0x3:
 451         case 0x7:
 452                 extra = 1;
 453         case 0x1:
 454                 state = OTG_STATE_B_PERIPHERAL;
 455                 break;
 456         case 0x11:
 457                 state = OTG_STATE_B_SRP_INIT;
 458                 break;
 459
 460         /* extra dual-role default-b states */
 461         case 0x12:
 462         case 0x13:
 463         case 0x16:
 464                 extra = 1;
 465         case 0x17:
 466                 state = OTG_STATE_B_WAIT_ACON;
 467                 break;
 468         case 0x34:
 469                 state = OTG_STATE_B_HOST;
 470                 break;
 471
 472         /* default-a */
 473         case 0x36:
 474                 state = OTG_STATE_A_IDLE;
 475                 break;
 476         case 0x3c:
 477                 state = OTG_STATE_A_WAIT_VFALL;
 478                 break;
 479         case 0x7d:
 480                 state = OTG_STATE_A_VBUS_ERR;
 481                 break;
 482         case 0x9e:
 483         case 0x9f:
 484                 extra = 1;
 485         case 0x89:
 486                 state = OTG_STATE_A_PERIPHERAL;
 487                 break;
 488         case 0xb7:
 489                 state = OTG_STATE_A_WAIT_VRISE;
 490                 break;
 491         case 0xb8:
 492                 state = OTG_STATE_A_WAIT_BCON;
 493                 break;
 494         case 0xb9:
 495                 state = OTG_STATE_A_HOST;
 496                 break;
 497         case 0xba:
 498                 state = OTG_STATE_A_SUSPEND;
 499                 break;
 500         default:
 501                 break;
 502         }
 503         if (isp->otg.state == state && !extra)
 504                 return;
 505         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 506                 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
 507 }
 508
 509 #else
 510
 511 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 512
 513 #endif
 514
 515 /* outputs from ISP1301_INTERRUPT_SOURCE */
 516 static void update_otg1(struct isp1301 *isp, u8 int_src)
 517 {
 518         u32     otg_ctrl;
 519
 520         otg_ctrl = OTG_CTRL_REG
 521                         & OTG_CTRL_MASK
 522                         & ~OTG_XCEIV_INPUTS
 523                         & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 524         if (int_src & INTR_SESS_VLD)
 525                 otg_ctrl |= OTG_ASESSVLD;
 526         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 527                 a_idle(isp, "vfall");
 528                 otg_ctrl &= ~OTG_CTRL_BITS;
 529         }
 530         if (int_src & INTR_VBUS_VLD)
 531                 otg_ctrl |= OTG_VBUSVLD;
 532         if (int_src & INTR_ID_GND) {            /* default-A */
 533                 if (isp->otg.state == OTG_STATE_B_IDLE
 534                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 535                         a_idle(isp, "init");
 536                         return;
 537                 }
 538         } else {                                /* default-B */
 539                 otg_ctrl |= OTG_ID;
 540                 if (isp->otg.state == OTG_STATE_A_IDLE
 541                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 542                         b_idle(isp, "init");
 543                         return;
 544                 }
 545         }
 546         OTG_CTRL_REG = otg_ctrl;
 547 }
 548
 549 /* outputs from ISP1301_OTG_STATUS */
 550 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 551 {
 552         u32     otg_ctrl;
 553
 554         otg_ctrl = OTG_CTRL_REG
 555                         & OTG_CTRL_MASK
 556                         & ~OTG_XCEIV_INPUTS
 557                         & ~(OTG_BSESSVLD|OTG_BSESSEND);
 558         if (otg_status & OTG_B_SESS_VLD)
 559                 otg_ctrl |= OTG_BSESSVLD;
 560         else if (otg_status & OTG_B_SESS_END)
 561                 otg_ctrl |= OTG_BSESSEND;
 562         OTG_CTRL_REG = otg_ctrl;
 563 }
 564
 565 /* inputs going to ISP1301 */
 566 static void otg_update_isp(struct isp1301 *isp)
 567 {
 568         u32     otg_ctrl, otg_change;
 569         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 570
 571         otg_ctrl = OTG_CTRL_REG;
 572         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 573         isp->last_otg_ctrl = otg_ctrl;
 574         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 575
 576         switch (isp->otg.state) {
 577         case OTG_STATE_B_IDLE:
 578         case OTG_STATE_B_PERIPHERAL:
 579         case OTG_STATE_B_SRP_INIT:
 580                 if (!(otg_ctrl & OTG_PULLUP)) {
 581                         // if (otg_ctrl & OTG_B_HNPEN) {
 582                         if (isp->otg.gadget->b_hnp_enable) {
 583                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 584                                 pr_debug("  --> b_wait_acon\n");
 585                         }
 586                         goto pulldown;
 587                 }
 588 pullup:
 589                 set |= OTG1_DP_PULLUP;
 590                 clr |= OTG1_DP_PULLDOWN;
 591                 break;
 592         case OTG_STATE_A_SUSPEND:
 593         case OTG_STATE_A_PERIPHERAL:
 594                 if (otg_ctrl & OTG_PULLUP)
 595                         goto pullup;
 596                 /* FALLTHROUGH */
 597         // case OTG_STATE_B_WAIT_ACON:
 598         default:
 599 pulldown:
 600                 set |= OTG1_DP_PULLDOWN;
 601                 clr |= OTG1_DP_PULLUP;
 602                 break;
 603         }
 604
 605 #       define toggle(OTG,ISP) do { \
 606                 if (otg_ctrl & OTG) set |= ISP; \
 607                 else clr |= ISP; \
 608                 } while (0)
 609
 610         if (!(isp->otg.host))
 611                 otg_ctrl &= ~OTG_DRV_VBUS;
 612
 613         switch (isp->otg.state) {
 614         case OTG_STATE_A_SUSPEND:
 615                 if (otg_ctrl & OTG_DRV_VBUS) {
 616                         set |= OTG1_VBUS_DRV;
 617                         break;
 618                 }
 619                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 620                 notresponding(isp);
 621
 622                 /* FALLTHROUGH */
 623         case OTG_STATE_A_VBUS_ERR:
 624                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 625                 pr_debug("  --> a_wait_vfall\n");
 626                 /* FALLTHROUGH */
 627         case OTG_STATE_A_WAIT_VFALL:
 628                 /* FIXME usbcore thinks port power is still on ... */
 629                 clr |= OTG1_VBUS_DRV;
 630                 break;
 631         case OTG_STATE_A_IDLE:
 632                 if (otg_ctrl & OTG_DRV_VBUS) {
 633                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 634                         pr_debug("  --> a_wait_vrise\n");
 635                 }
 636                 /* FALLTHROUGH */
 637         default:
 638                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 639         }
 640
 641         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 642         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 643
 644 #       undef toggle
 645
 646         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 647         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 648
 649         /* HNP switch to host or peripheral; and SRP */
 650         if (otg_change & OTG_PULLUP) {
 651                 switch (isp->otg.state) {
 652                 case OTG_STATE_B_IDLE:
 653                         if (clr & OTG1_DP_PULLUP)
 654                                 break;
 655                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 656                         pr_debug("  --> b_peripheral\n");
 657                         break;
 658                 case OTG_STATE_A_SUSPEND:
 659                         if (clr & OTG1_DP_PULLUP)
 660                                 break;
 661                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 662                         pr_debug("  --> a_peripheral\n");
 663                         break;
 664                 default:
 665                         break;
 666                 }
 667                 OTG_CTRL_REG |= OTG_PULLUP;
 668         }
 669
 670         check_state(isp, __FUNCTION__);
 671         dump_regs(isp, "otg->isp1301");
 672 }
 673
 674 static irqreturn_t omap_otg_irq(int irq, void *_isp, struct pt_regs *regs)
 675 {
 676         u16             otg_irq = OTG_IRQ_SRC_REG;
 677         u32             otg_ctrl;
 678         int             ret = IRQ_NONE;
 679         struct isp1301  *isp = _isp;
 680
 681         /* update ISP1301 transciever from OTG controller */
 682         if (otg_irq & OPRT_CHG) {
 683                 OTG_IRQ_SRC_REG = OPRT_CHG;
 684                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 685                 ret = IRQ_HANDLED;
 686
 687         /* SRP to become b_peripheral failed */
 688         } else if (otg_irq & B_SRP_TMROUT) {
 689                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
 690                 notresponding(isp);
 691
 692                 /* gadget drivers that care should monitor all kinds of
 693                  * remote wakeup (SRP, normal) using their own timer
 694                  * to give "check cable and A-device" messages.
 695                  */
 696                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 697                         b_idle(isp, "srp_timeout");
 698
 699                 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
 700                 ret = IRQ_HANDLED;
 701
 702         /* HNP to become b_host failed */
 703         } else if (otg_irq & B_HNP_FAIL) {
 704                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 705                                 state_name(isp), OTG_CTRL_REG);
 706                 notresponding(isp);
 707
 708                 otg_ctrl = OTG_CTRL_REG;
 709                 otg_ctrl |= OTG_BUSDROP;
 710                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 711                 OTG_CTRL_REG = otg_ctrl;
 712
 713                 /* subset of b_peripheral()... */
 714                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 715                 pr_debug("  --> b_peripheral\n");
 716
 717                 OTG_IRQ_SRC_REG = B_HNP_FAIL;
 718                 ret = IRQ_HANDLED;
 719
 720         /* detect SRP from B-device ... */
 721         } else if (otg_irq & A_SRP_DETECT) {
 722                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 723                                 state_name(isp), OTG_CTRL_REG);
 724
 725                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 726                 switch (isp->otg.state) {
 727                 case OTG_STATE_A_IDLE:
 728                         if (!isp->otg.host)
 729                                 break;
 730                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 731                         otg_ctrl = OTG_CTRL_REG;
 732                         otg_ctrl |= OTG_A_BUSREQ;
 733                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 734                                         & ~OTG_XCEIV_INPUTS
 735                                         & OTG_CTRL_MASK;
 736                         OTG_CTRL_REG = otg_ctrl;
 737                         break;
 738                 default:
 739                         break;
 740                 }
 741
 742                 OTG_IRQ_SRC_REG = A_SRP_DETECT;
 743                 ret = IRQ_HANDLED;
 744
 745         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 746          * we don't track them separately
 747          */
 748         } else if (otg_irq & A_REQ_TMROUT) {
 749                 otg_ctrl = OTG_CTRL_REG;
 750                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 751                                 state_name(isp), otg_ctrl);
 752                 notresponding(isp);
 753
 754                 otg_ctrl |= OTG_BUSDROP;
 755                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 756                 OTG_CTRL_REG = otg_ctrl;
 757                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 758
 759                 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
 760                 ret = IRQ_HANDLED;
 761
 762         /* A-supplied voltage fell too low; overcurrent */
 763         } else if (otg_irq & A_VBUS_ERR) {
 764                 otg_ctrl = OTG_CTRL_REG;
 765                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 766                         state_name(isp), otg_irq, otg_ctrl);
 767
 768                 otg_ctrl |= OTG_BUSDROP;
 769                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 770                 OTG_CTRL_REG = otg_ctrl;
 771                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 772
 773                 OTG_IRQ_SRC_REG = A_VBUS_ERR;
 774                 ret = IRQ_HANDLED;
 775
 776         /* switch driver; the transciever code activates it,
 777          * ungating the udc clock or resuming OHCI.
 778          */
 779         } else if (otg_irq & DRIVER_SWITCH) {
 780                 int     kick = 0;
 781
 782                 otg_ctrl = OTG_CTRL_REG;
 783                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 784                                 state_name(isp),
 785                                 (otg_ctrl & OTG_DRIVER_SEL)
 786                                         ? "gadget" : "host",
 787                                 otg_ctrl);
 788                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 789
 790                 /* role is peripheral */
 791                 if (otg_ctrl & OTG_DRIVER_SEL) {
 792                         switch (isp->otg.state) {
 793                         case OTG_STATE_A_IDLE:
 794                                 b_idle(isp, __FUNCTION__);
 795                                 break;
 796                         default:
 797                                 break;
 798                         }
 799                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 800
 801                 /* role is host */
 802                 } else {
 803                         if (!(otg_ctrl & OTG_ID)) {
 804                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 805                                 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
 806                         }
 807
 808                         if (isp->otg.host) {
 809                                 switch (isp->otg.state) {
 810                                 case OTG_STATE_B_WAIT_ACON:
 811                                         isp->otg.state = OTG_STATE_B_HOST;
 812                                         pr_debug("  --> b_host\n");
 813                                         kick = 1;
 814                                         break;
 815                                 case OTG_STATE_A_WAIT_BCON:
 816                                         isp->otg.state = OTG_STATE_A_HOST;
 817                                         pr_debug("  --> a_host\n");
 818                                         break;
 819                                 case OTG_STATE_A_PERIPHERAL:
 820                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 821                                         pr_debug("  --> a_wait_bcon\n");
 822                                         break;
 823                                 default:
 824                                         break;
 825                                 }
 826                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 827                         }
 828                 }
 829
 830                 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
 831                 ret = IRQ_HANDLED;
 832
 833                 if (kick)
 834                         usb_bus_start_enum(isp->otg.host,
 835                                                 isp->otg.host->otg_port);
 836         }
 837
 838         check_state(isp, __FUNCTION__);
 839         return ret;
 840 }
 841
 842 static struct platform_device *otg_dev;
 843
 844 static int otg_init(struct isp1301 *isp)
 845 {
 846         if (!otg_dev)
 847                 return -ENODEV;
 848
 849         dump_regs(isp, __FUNCTION__);
 850         /* some of these values are board-specific... */
 851         OTG_SYSCON_2_REG |= OTG_EN
 852                 /* for B-device: */
 853                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 854                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 855                 // | (3 << 24)          /* 2msec VBUS pulse */
 856                 /* for A-device: */
 857                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 858                 | SRP_DPW               /* detect 167+ns SRP pulses */
 859                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 860                 ;
 861
 862         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 863         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 864
 865         check_state(isp, __FUNCTION__);
 866         pr_debug("otg: %s, %s %06x\n",
 867                         state_name(isp), __FUNCTION__, OTG_CTRL_REG);
 868
 869         OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
 870                         | B_SRP_TMROUT | B_HNP_FAIL
 871                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
 872         OTG_SYSCON_2_REG |= OTG_EN;
 873
 874         return 0;
 875 }
 876
 877 static int otg_probe(struct device *dev)
 878 {
 879         // struct omap_usb_config *config = dev->platform_data;
 880
 881         otg_dev = to_platform_device(dev);
 882         return 0;
 883 }
 884
 885 static int otg_remove(struct device *dev)
 886 {
 887         otg_dev = 0;
 888         return 0;
 889 }
 890
 891 struct device_driver omap_otg_driver = {
 892         .name           = "omap_otg",
 893         .bus            = &platform_bus_type,
 894         .probe          = otg_probe,
 895         .remove         = otg_remove,
 896 };
 897
 898 static int otg_bind(struct isp1301 *isp)
 899 {
 900         int     status;
 901
 902         if (otg_dev)
 903                 return -EBUSY;
 904
 905         status = driver_register(&omap_otg_driver);
 906         if (status < 0)
 907                 return status;
 908
 909         if (otg_dev)
 910                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 911                                 SA_INTERRUPT, DRIVER_NAME, isp);
 912         else
 913                 status = -ENODEV;
 914
 915         if (status < 0)
 916                 driver_unregister(&omap_otg_driver);
 917         return status;
 918 }
 919
 920 static void otg_unbind(struct isp1301 *isp)
 921 {
 922         if (!otg_dev)
 923                 return;
 924         free_irq(otg_dev->resource[1].start, isp);
 925 }
 926
 927 #else
 928
 929 /* OTG controller isn't clocked */
 930
 931 #endif  /* CONFIG_USB_OTG */
 932
 933 /*-------------------------------------------------------------------------*/
 934
 935 static void b_peripheral(struct isp1301 *isp)
 936 {
 937         enable_vbus_draw(isp, 8);
 938         OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 939         usb_gadget_vbus_connect(isp->otg.gadget);
 940
 941 #ifdef  CONFIG_USB_OTG
 942         otg_update_isp(isp);
 943 #else
 944         /* UDC driver just set OTG_BSESSVLD */
 945         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 946         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 947         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 948         pr_debug("  --> b_peripheral\n");
 949         dump_regs(isp, "2periph");
 950 #endif
 951 }
 952
 953 static int isp_update_otg(struct isp1301 *isp, u8 stat)
 954 {
 955         u8                      isp_stat, isp_bstat;
 956         enum usb_otg_state      state = isp->otg.state;
 957
 958         if (stat & INTR_BDIS_ACON)
 959                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 960
 961         /* start certain state transitions right away */
 962         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 963         if (isp_stat & INTR_ID_GND) {
 964                 if (isp->otg.default_a) {
 965                         switch (state) {
 966                         case OTG_STATE_B_IDLE:
 967                                 a_idle(isp, "idle");
 968                                 /* FALLTHROUGH */
 969                         case OTG_STATE_A_IDLE:
 970                                 enable_vbus_source(isp);
 971                                 /* FALLTHROUGH */
 972                         case OTG_STATE_A_WAIT_VRISE:
 973                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 974                                  * the HC will transition to A_HOST (or
 975                                  * A_SUSPEND!) without our noticing except
 976                                  * when HNP is used.
 977                                  */
 978                                 if (isp_stat & INTR_VBUS_VLD)
 979                                         isp->otg.state = OTG_STATE_A_HOST;
 980                                 break;
 981                         case OTG_STATE_A_WAIT_VFALL:
 982                                 if (!(isp_stat & INTR_SESS_VLD))
 983                                         a_idle(isp, "vfell");
 984                                 break;
 985                         default:
 986                                 if (!(isp_stat & INTR_VBUS_VLD))
 987                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
 988                                 break;
 989                         }
 990                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 991                 } else {
 992                         switch (state) {
 993                         case OTG_STATE_B_PERIPHERAL:
 994                         case OTG_STATE_B_HOST:
 995                         case OTG_STATE_B_WAIT_ACON:
 996                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
 997                                 break;
 998                         default:
 999                                 break;
1000                         }
1001                         if (state != OTG_STATE_A_IDLE)
1002                                 a_idle(isp, "id");
1003                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1004                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1005                         isp_bstat = 0;
1006                 }
1007         } else {
1008                 /* if user unplugged mini-A end of cable,
1009                  * don't bypass A_WAIT_VFALL.
1010                  */
1011                 if (isp->otg.default_a) {
1012                         switch (state) {
1013                         default:
1014                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1015                                 break;
1016                         case OTG_STATE_A_WAIT_VFALL:
1017                                 state = OTG_STATE_A_IDLE;
1018                                 /* khubd may take a while to notice and
1019                                  * handle this disconnect, so don't go
1020                                  * to B_IDLE quite yet.
1021                                  */
1022                                 break;
1023                         case OTG_STATE_A_IDLE:
1024                                 host_suspend(isp);
1025                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1026                                                 MC1_BDIS_ACON_EN);
1027                                 isp->otg.state = OTG_STATE_B_IDLE;
1028                                 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1029                                                 & ~OTG_CTRL_BITS;
1030                                 break;
1031                         case OTG_STATE_B_IDLE:
1032                                 break;
1033                         }
1034                 }
1035                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1036
1037                 switch (isp->otg.state) {
1038                 case OTG_STATE_B_PERIPHERAL:
1039                 case OTG_STATE_B_WAIT_ACON:
1040                 case OTG_STATE_B_HOST:
1041                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1042                                 break;
1043                         enable_vbus_draw(isp, 0);
1044 #ifndef CONFIG_USB_OTG
1045                         /* UDC driver will clear OTG_BSESSVLD */
1046                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1047                                                 OTG1_DP_PULLDOWN);
1048                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1049                                                 OTG1_DP_PULLUP);
1050                         dump_regs(isp, __FUNCTION__);
1051 #endif
1052                         /* FALLTHROUGH */
1053                 case OTG_STATE_B_SRP_INIT:
1054                         b_idle(isp, __FUNCTION__);
1055                         OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1056                         /* FALLTHROUGH */
1057                 case OTG_STATE_B_IDLE:
1058                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1059 #ifdef  CONFIG_USB_OTG
1060                                 update_otg1(isp, isp_stat);
1061                                 update_otg2(isp, isp_bstat);
1062 #endif
1063                                 b_peripheral(isp);
1064                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1065                                 isp_bstat |= OTG_B_SESS_END;
1066                         break;
1067                 case OTG_STATE_A_WAIT_VFALL:
1068                         break;
1069                 default:
1070                         pr_debug("otg: unsupported b-device %s\n",
1071                                 state_name(isp));
1072                         break;
1073                 }
1074         }
1075
1076         if (state != isp->otg.state)
1077                 pr_debug("  isp, %s -> %s\n",
1078                                 state_string(state), state_name(isp));
1079
1080 #ifdef  CONFIG_USB_OTG
1081         /* update the OTG controller state to match the isp1301; may
1082          * trigger OPRT_CHG irqs for changes going to the isp1301.
1083          */
1084         update_otg1(isp, isp_stat);
1085         update_otg2(isp, isp_bstat);
1086         check_state(isp, __FUNCTION__);
1087 #endif
1088
1089         dump_regs(isp, "isp1301->otg");
1090 }
1091
1092 /*-------------------------------------------------------------------------*/
1093
1094 static u8 isp1301_clear_latch(struct isp1301 *isp)
1095 {
1096         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1097         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1098         return latch;
1099 }
1100
1101 static void
1102 isp1301_work(void *data)
1103 {
1104         struct isp1301  *isp = data;
1105         int             stop;
1106
1107         /* implicit lock:  we're the only task using this device */
1108         isp->working = 1;
1109         do {
1110                 stop = test_bit(WORK_STOP, &isp->todo);
1111
1112 #ifdef  CONFIG_USB_OTG
1113                 /* transfer state from otg engine to isp1301 */
1114                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1115                         otg_update_isp(isp);
1116                         put_device(&isp->client.dev);
1117                 }
1118 #endif
1119                 /* transfer state from isp1301 to otg engine */
1120                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1121                         u8              stat = isp1301_clear_latch(isp);
1122
1123                         isp_update_otg(isp, stat);
1124                         put_device(&isp->client.dev);
1125                 }
1126
1127                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1128                         u32     otg_ctrl;
1129
1130                         /*
1131                          * skip A_WAIT_VRISE; hc transitions invisibly
1132                          * skip A_WAIT_BCON; same.
1133                          */
1134                         switch (isp->otg.state) {
1135                         case OTG_STATE_A_WAIT_BCON:
1136                         case OTG_STATE_A_WAIT_VRISE:
1137                                 isp->otg.state = OTG_STATE_A_HOST;
1138                                 pr_debug("  --> a_host\n");
1139                                 otg_ctrl = OTG_CTRL_REG;
1140                                 otg_ctrl |= OTG_A_BUSREQ;
1141                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1142                                                 & OTG_CTRL_MASK;
1143                                 OTG_CTRL_REG = otg_ctrl;
1144                                 break;
1145                         case OTG_STATE_B_WAIT_ACON:
1146                                 isp->otg.state = OTG_STATE_B_HOST;
1147                                 pr_debug("  --> b_host (acon)\n");
1148                                 break;
1149                         case OTG_STATE_B_HOST:
1150                         case OTG_STATE_B_IDLE:
1151                         case OTG_STATE_A_IDLE:
1152                                 break;
1153                         default:
1154                                 pr_debug("  host resume in %s\n",
1155                                                 state_name(isp));
1156                         }
1157                         host_resume(isp);
1158                         // mdelay(10);
1159                         put_device(&isp->client.dev);
1160                 }
1161
1162                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1163 #ifdef  VERBOSE
1164                         dump_regs(isp, "timer");
1165                         if (!stop)
1166                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1167 #endif
1168                         put_device(&isp->client.dev);
1169                 }
1170
1171                 if (isp->todo)
1172                         dev_vdbg(&isp->client.dev,
1173                                 "work done, todo = 0x%lx\n",
1174                                 isp->todo);
1175                 if (stop) {
1176                         dev_dbg(&isp->client.dev, "stop\n");
1177                         break;
1178                 }
1179         } while (isp->todo);
1180         isp->working = 0;
1181 }
1182
1183 static irqreturn_t isp1301_irq(int irq, void *isp, struct pt_regs *regs)
1184 {
1185         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1186         return IRQ_HANDLED;
1187 }
1188
1189 static void isp1301_timer(unsigned long _isp)
1190 {
1191         isp1301_defer_work((void *)_isp, WORK_TIMER);
1192 }
1193
1194 /*-------------------------------------------------------------------------*/
1195
1196 static void isp1301_release(struct device *dev)
1197 {
1198         struct isp1301  *isp;
1199
1200         isp = container_of(dev, struct isp1301, client.dev);
1201
1202         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1203         if (isp->i2c_release)
1204                 isp->i2c_release(dev);
1205         kfree (isp);
1206 }
1207
1208 static struct isp1301 *the_transceiver;
1209
1210 static int isp1301_detach_client(struct i2c_client *i2c)
1211 {
1212         struct isp1301  *isp;
1213
1214         isp = container_of(i2c, struct isp1301, client);
1215
1216         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1217         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1218         free_irq(isp->irq, isp);
1219 #ifdef  CONFIG_USB_OTG
1220         otg_unbind(isp);
1221 #endif
1222         if (machine_is_omap_h2())
1223                 omap_free_gpio(2);
1224
1225         isp->timer.data = 0;
1226         set_bit(WORK_STOP, &isp->todo);
1227         del_timer_sync(&isp->timer);
1228         flush_scheduled_work();
1229
1230         put_device(&i2c->dev);
1231         the_transceiver = 0;
1232
1233         return i2c_detach_client(i2c);
1234 }
1235
1236 /*-------------------------------------------------------------------------*/
1237
1238 /* NOTE:  three modes are possible here, only one of which
1239  * will be standards-conformant on any given system:
1240  *
1241  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1242  *  - HOST mode, for when there's one or more A (host) connectors
1243  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1244  *
1245  * As a rule, you won't have an isp1301 chip unless it's there to
1246  * support the OTG mode.  Other modes help testing USB controllers
1247  * in isolation from (full) OTG support, or maybe so later board
1248  * revisions can help to support those feature.
1249  */
1250
1251 #ifdef  CONFIG_USB_OTG
1252
1253 static int isp1301_otg_enable(struct isp1301 *isp)
1254 {
1255         power_up(isp);
1256         otg_init(isp);
1257
1258         /* NOTE:  since we don't change this, this provides
1259          * a few more interrupts than are strictly needed.
1260          */
1261         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1262                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1263         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1264                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1265
1266         dev_info(&isp->client.dev, "ready for dual-role USB ...\n");
1267
1268         return 0;
1269 }
1270
1271 #endif
1272
1273 /* add or disable the host device+driver */
1274 static int
1275 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1276 {
1277         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1278
1279         if (!otg || isp != the_transceiver)
1280                 return -ENODEV;
1281
1282         if (!host) {
1283                 OTG_IRQ_EN_REG = 0;
1284                 power_down(isp);
1285                 isp->otg.host = 0;
1286                 return 0;
1287         }
1288
1289 #ifdef  CONFIG_USB_OTG
1290         isp->otg.host = host;
1291         dev_dbg(&isp->client.dev, "registered host\n");
1292         host_suspend(isp);
1293         if (isp->otg.gadget)
1294                 return isp1301_otg_enable(isp);
1295         return 0;
1296
1297 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1298         // FIXME update its refcount
1299         isp->otg.host = host;
1300
1301         power_up(isp);
1302
1303         if (machine_is_omap_h2())
1304                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1305
1306         dev_info(&isp->client.dev, "A-Host sessions ok\n");
1307         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1308                 INTR_ID_GND);
1309         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1310                 INTR_ID_GND);
1311
1312         /* If this has a Mini-AB connector, this mode is highly
1313          * nonstandard ... but can be handy for testing, especially with
1314          * the Mini-A end of an OTG cable.  (Or something nonstandard
1315          * like MiniB-to-StandardB, maybe built with a gender mender.)
1316          */
1317         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1318
1319         dump_regs(isp, __FUNCTION__);
1320
1321         return 0;
1322
1323 #else
1324         dev_dbg(&isp->client.dev, "host sessions not allowed\n");
1325         return -EINVAL;
1326 #endif
1327
1328 }
1329
1330 static int
1331 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1332 {
1333         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1334
1335         if (!otg || isp != the_transceiver)
1336                 return -ENODEV;
1337
1338         if (!gadget) {
1339                 OTG_IRQ_EN_REG = 0;
1340                 if (!isp->otg.default_a)
1341                         enable_vbus_draw(isp, 0);
1342                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1343                 isp->otg.gadget = 0;
1344                 power_down(isp);
1345                 return 0;
1346         }
1347
1348 #ifdef  CONFIG_USB_OTG
1349         isp->otg.gadget = gadget;
1350         dev_dbg(&isp->client.dev, "registered gadget\n");
1351         /* gadget driver may be suspended until vbus_connect () */
1352         if (isp->otg.host)
1353                 return isp1301_otg_enable(isp);
1354         return 0;
1355
1356 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1357         isp->otg.gadget = gadget;
1358         // FIXME update its refcount
1359
1360         OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1361                                 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1362                         | OTG_ID;
1363         power_up(isp);
1364         isp->otg.state = OTG_STATE_B_IDLE;
1365
1366         if (machine_is_omap_h2())
1367                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1368
1369         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1370                 INTR_SESS_VLD);
1371         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1372                 INTR_VBUS_VLD);
1373         dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1374         dump_regs(isp, __FUNCTION__);
1375
1376         /* If this has a Mini-AB connector, this mode is highly
1377          * nonstandard ... but can be handy for testing, so long
1378          * as you don't plug a Mini-A cable into the jack.
1379          */
1380         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1381                 b_peripheral(isp);
1382
1383         return 0;
1384
1385 #else
1386         dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1387         return -EINVAL;
1388 #endif
1389 }
1390
1391
1392 /*-------------------------------------------------------------------------*/
1393
1394 static int
1395 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1396 {
1397         if (!the_transceiver)
1398                 return -ENODEV;
1399         if (dev->state == OTG_STATE_B_PERIPHERAL)
1400                 enable_vbus_draw(the_transceiver, mA);
1401         return 0;
1402 }
1403
1404 static int
1405 isp1301_start_srp(struct otg_transceiver *dev)
1406 {
1407         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1408         u32             otg_ctrl;
1409
1410         if (!dev || isp != the_transceiver
1411                         || isp->otg.state != OTG_STATE_B_IDLE)
1412                 return -ENODEV;
1413
1414         otg_ctrl = OTG_CTRL_REG;
1415         if (!(otg_ctrl & OTG_BSESSEND))
1416                 return -EINVAL;
1417
1418         otg_ctrl |= OTG_B_BUSREQ;
1419         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1420         OTG_CTRL_REG = otg_ctrl;
1421         isp->otg.state = OTG_STATE_B_SRP_INIT;
1422
1423         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1424 #ifdef  CONFIG_USB_OTG
1425         check_state(isp, __FUNCTION__);
1426 #endif
1427         return 0;
1428 }
1429
1430 static int
1431 isp1301_start_hnp(struct otg_transceiver *dev)
1432 {
1433 #ifdef  CONFIG_USB_OTG
1434         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1435
1436         if (!dev || isp != the_transceiver)
1437                 return -ENODEV;
1438         if (isp->otg.default_a && (isp->otg.host == NULL
1439                         || !isp->otg.host->b_hnp_enable))
1440                 return -ENOTCONN;
1441         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1442                         || !isp->otg.gadget->b_hnp_enable))
1443                 return -ENOTCONN;
1444
1445         /* We want hardware to manage most HNP protocol timings.
1446          * So do this part as early as possible...
1447          */
1448         switch (isp->otg.state) {
1449         case OTG_STATE_B_HOST:
1450                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1451                 /* caller will suspend next */
1452                 break;
1453         case OTG_STATE_A_HOST:
1454 #if 0
1455                 /* autoconnect mode avoids irq latency bugs */
1456                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1457                                 MC1_BDIS_ACON_EN);
1458 #endif
1459                 /* caller must suspend then clear A_BUSREQ */
1460                 usb_gadget_vbus_connect(isp->otg.gadget);
1461                 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1462
1463                 break;
1464         case OTG_STATE_A_PERIPHERAL:
1465                 /* initiated by B-Host suspend */
1466                 break;
1467         default:
1468                 return -EILSEQ;
1469         }
1470         pr_debug("otg: HNP %s, %06x ...\n",
1471                 state_name(isp), OTG_CTRL_REG);
1472         check_state(isp, __FUNCTION__);
1473         return 0;
1474 #else
1475         /* srp-only */
1476         return -EINVAL;
1477 #endif
1478 }
1479
1480 /*-------------------------------------------------------------------------*/
1481
1482 /* no error returns, they'd just make bus scanning stop */
1483 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1484 {
1485         int                     status;
1486         struct isp1301          *isp;
1487         struct i2c_client       *i2c;
1488
1489         if (the_transceiver)
1490                 return 0;
1491
1492         isp = kmalloc(sizeof *isp, GFP_KERNEL);
1493         if (!isp)
1494                 return 0;
1495
1496         memset(isp, 0, sizeof *isp);
1497
1498         INIT_WORK(&isp->work, isp1301_work, isp);
1499         init_timer(&isp->timer);
1500         isp->timer.function = isp1301_timer;
1501         isp->timer.data = (unsigned long) isp;
1502
1503         isp->irq = -1;
1504         isp->client.addr = address;
1505         i2c_set_clientdata(&isp->client, isp);
1506         isp->client.adapter = bus;
1507         isp->client.id = 1301;
1508         isp->client.driver = &isp1301_driver;
1509         strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1510         i2c = &isp->client;
1511
1512         /* if this is a true probe, verify the chip ... */
1513         if (kind < 0) {
1514                 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1515                 if (status != I2C_VENDOR_ID_PHILIPS) {
1516                         dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1517                                 address, status);
1518                         goto fail1;
1519                 }
1520                 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1521                 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1522                         dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1523                                 address, status);
1524                         goto fail1;
1525                 }
1526         }
1527
1528         status = i2c_attach_client(i2c);
1529         if (status < 0) {
1530                 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1531                                 DRIVER_NAME, address, status);
1532 fail1:
1533                 kfree(isp);
1534                 return 0;
1535         }
1536         isp->i2c_release = i2c->dev.release;
1537         i2c->dev.release = isp1301_release;
1538
1539         /* initial development used chiprev 2.00 */
1540         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1541         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1542                 status >> 8, status & 0xff);
1543
1544         /* make like power-on reset */
1545         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1546
1547         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1548         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1549
1550         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1551                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1552         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1553                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1554
1555         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1556         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1557         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1558
1559 #ifdef  CONFIG_USB_OTG
1560         status = otg_bind(isp);
1561         if (status < 0) {
1562                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1563                 goto fail2;
1564         }
1565 #endif
1566
1567         if (machine_is_omap_h2()) {
1568                 /* full speed signaling by default */
1569                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1570                         MC1_SPEED_REG);
1571                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1572                         MC2_SPD_SUSP_CTRL);
1573
1574                 /* IRQ wired at M14 */
1575                 omap_cfg_reg(M14_1510_GPIO2);
1576                 isp->irq = OMAP_GPIO_IRQ(2);
1577                 omap_request_gpio(2);
1578                 omap_set_gpio_direction(2, 1);
1579                 omap_set_gpio_edge_ctrl(2, OMAP_GPIO_FALLING_EDGE);
1580         }
1581
1582         status = request_irq(isp->irq, isp1301_irq,
1583                         SA_SAMPLE_RANDOM, DRIVER_NAME, isp);
1584         if (status < 0) {
1585                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1586                                 isp->irq, status);
1587 #ifdef  CONFIG_USB_OTG
1588 fail2:
1589 #endif
1590                 i2c_detach_client(i2c);
1591                 goto fail1;
1592         }
1593
1594         isp->otg.dev = &isp->client.dev;
1595         isp->otg.label = DRIVER_NAME;
1596
1597         isp->otg.set_host = isp1301_set_host,
1598         isp->otg.set_peripheral = isp1301_set_peripheral,
1599         isp->otg.set_power = isp1301_set_power,
1600         isp->otg.start_srp = isp1301_start_srp,
1601         isp->otg.start_hnp = isp1301_start_hnp,
1602
1603         enable_vbus_draw(isp, 0);
1604         power_down(isp);
1605         the_transceiver = isp;
1606
1607 #ifdef  CONFIG_USB_OTG
1608         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1609         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1610 #endif
1611
1612         dump_regs(isp, __FUNCTION__);
1613
1614 #ifdef  VERBOSE
1615         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1616         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1617 #endif
1618
1619         status = otg_set_transceiver(&isp->otg);
1620         if (status < 0)
1621                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1622                         status);
1623
1624         return 0;
1625 }
1626
1627 static int isp1301_scan_bus(struct i2c_adapter *bus)
1628 {
1629         if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1630                         | I2C_FUNC_SMBUS_READ_WORD_DATA))
1631                 return -EINVAL;
1632         return i2c_probe(bus, &addr_data, isp1301_probe);
1633 }
1634
1635 static struct i2c_driver isp1301_driver = {
1636         .owner          = THIS_MODULE,
1637         .name           = "isp1301_omap",
1638         .id             = 1301,         /* FIXME "official", i2c-ids.h */
1639         .class          = I2C_CLASS_HWMON,
1640         .flags          = I2C_DF_NOTIFY,
1641         .attach_adapter = isp1301_scan_bus,
1642         .detach_client  = isp1301_detach_client,
1643 };
1644
1645 /*-------------------------------------------------------------------------*/
1646
1647 static int __init isp_init(void)
1648 {
1649         return i2c_add_driver(&isp1301_driver);
1650 }
1651 module_init(isp_init);
1652
1653 static void __exit isp_exit(void)
1654 {
1655         if (the_transceiver)
1656                 otg_set_transceiver(0);
1657         i2c_del_driver(&isp1301_driver);
1658 }
1659 module_exit(isp_exit);
1660