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
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/gpio.h>
  29 #include <linux/usb/ch9.h>
  30 #include <linux/usb/gadget.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/otg.h>
  33 #include <linux/i2c.h>
  34 #include <linux/workqueue.h>
  35 #include <linux/io.h>
  36
  37 #include <asm/irq.h>
  38 #include <asm/mach-types.h>
  39
  40 #include <mach/usb.h>
  41 #include <mach/mux.h>
  42
  43
  44 #ifndef DEBUG
  45 #undef  VERBOSE
  46 #endif
  47
  48
  49 #define DRIVER_VERSION  "24 August 2004"
  50 #define DRIVER_NAME     (isp1301_driver.driver.name)
  51
  52 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  53 MODULE_LICENSE("GPL");
  54
  55 struct isp1301 {
  56         struct otg_transceiver  otg;
  57         struct i2c_client       *client;
  58         void                    (*i2c_release)(struct device *dev);
  59
  60         int                     irq_type;
  61
  62         u32                     last_otg_ctrl;
  63         unsigned                working:1;
  64
  65         struct timer_list       timer;
  66
  67         /* use keventd context to change the state for us */
  68         struct work_struct      work;
  69
  70         unsigned long           todo;
  71 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  72 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  73 #               define WORK_HOST_RESUME 4       /* resume host */
  74 #               define WORK_TIMER       6       /* timer fired */
  75 #               define WORK_STOP        7       /* don't resubmit */
  76 };
  77
  78
  79 /* bits in OTG_CTRL */
  80
  81 #define OTG_XCEIV_OUTPUTS \
  82         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  83 #define OTG_XCEIV_INPUTS \
  84         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  85 #define OTG_CTRL_BITS \
  86         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  87         /* and OTG_PULLUP is sometimes written */
  88
  89 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  90         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  91         OTG_CTRL_BITS)
  92
  93
  94 /*-------------------------------------------------------------------------*/
  95
  96 /* board-specific PM hooks */
  97
  98 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  99
 100 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 101
 102 #include <linux/i2c/tps65010.h>
 103
 104 #else
 105
 106 static inline int tps65010_set_vbus_draw(unsigned mA)
 107 {
 108         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 109         return 0;
 110 }
 111
 112 #endif
 113
 114 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 115 {
 116         int status = tps65010_set_vbus_draw(mA);
 117         if (status < 0)
 118                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 119 }
 120
 121 static void enable_vbus_source(struct isp1301 *isp)
 122 {
 123         /* this board won't supply more than 8mA vbus power.
 124          * some boards can switch a 100ma "unit load" (or more).
 125          */
 126 }
 127
 128
 129 /* products will deliver OTG messages with LEDs, GUI, etc */
 130 static inline void notresponding(struct isp1301 *isp)
 131 {
 132         printk(KERN_NOTICE "OTG device not responding.\n");
 133 }
 134
 135
 136 #endif
 137
 138 #if defined(CONFIG_MACH_OMAP_H4)
 139
 140 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 141 {
 142         /* H4 controls this by DIP switch S2.4; no soft control.
 143          * ON means the charger is always enabled.  Leave it OFF
 144          * unless the OTG port is used only in B-peripheral mode.
 145          */
 146 }
 147
 148 static void enable_vbus_source(struct isp1301 *isp)
 149 {
 150         /* this board won't supply more than 8mA vbus power.
 151          * some boards can switch a 100ma "unit load" (or more).
 152          */
 153 }
 154
 155
 156 /* products will deliver OTG messages with LEDs, GUI, etc */
 157 static inline void notresponding(struct isp1301 *isp)
 158 {
 159         printk(KERN_NOTICE "OTG device not responding.\n");
 160 }
 161
 162
 163 #endif
 164
 165 /*-------------------------------------------------------------------------*/
 166
 167 static struct i2c_driver isp1301_driver;
 168
 169 /* smbus apis are used for portability */
 170
 171 static inline u8
 172 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 173 {
 174         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 175 }
 176
 177 static inline int
 178 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 179 {
 180         return i2c_smbus_read_word_data(isp->client, reg);
 181 }
 182
 183 static inline int
 184 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 185 {
 186         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 187 }
 188
 189 static inline int
 190 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 191 {
 192         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 193 }
 194
 195 /*-------------------------------------------------------------------------*/
 196
 197 /* identification */
 198 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 199 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 200 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 201
 202 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 203 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 204
 205 /* operational registers */
 206 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 207 #       define  MC1_SPEED               (1 << 0)
 208 #       define  MC1_SUSPEND             (1 << 1)
 209 #       define  MC1_DAT_SE0             (1 << 2)
 210 #       define  MC1_TRANSPARENT         (1 << 3)
 211 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 212 #       define  MC1_OE_INT_EN           (1 << 5)
 213 #       define  MC1_UART_EN             (1 << 6)
 214 #       define  MC1_MASK                0x7f
 215 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 216 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 217 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 218 #       define  MC2_BI_DI               (1 << 2)
 219 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 220 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 221 #       define  MC2_AUDIO_EN            (1 << 5)
 222 #       define  MC2_PSW_EN              (1 << 6)
 223 #       define  MC2_EN2V7               (1 << 7)
 224 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 225 #       define  OTG1_DP_PULLUP          (1 << 0)
 226 #       define  OTG1_DM_PULLUP          (1 << 1)
 227 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 228 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 229 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 230 #       define  OTG1_VBUS_DRV           (1 << 5)
 231 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 232 #       define  OTG1_VBUS_CHRG          (1 << 7)
 233 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 234 #       define  OTG_B_SESS_END          (1 << 6)
 235 #       define  OTG_B_SESS_VLD          (1 << 7)
 236
 237 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 238 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 239
 240 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 241 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 242
 243 /* same bitfields in all interrupt registers */
 244 #       define  INTR_VBUS_VLD           (1 << 0)
 245 #       define  INTR_SESS_VLD           (1 << 1)
 246 #       define  INTR_DP_HI              (1 << 2)
 247 #       define  INTR_ID_GND             (1 << 3)
 248 #       define  INTR_DM_HI              (1 << 4)
 249 #       define  INTR_ID_FLOAT           (1 << 5)
 250 #       define  INTR_BDIS_ACON          (1 << 6)
 251 #       define  INTR_CR_INT             (1 << 7)
 252
 253 /*-------------------------------------------------------------------------*/
 254
 255 static const char *state_string(enum usb_otg_state state)
 256 {
 257         switch (state) {
 258         case OTG_STATE_A_IDLE:          return "a_idle";
 259         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 260         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 261         case OTG_STATE_A_HOST:          return "a_host";
 262         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 263         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 264         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 265         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 266         case OTG_STATE_B_IDLE:          return "b_idle";
 267         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 268         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 269         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 270         case OTG_STATE_B_HOST:          return "b_host";
 271         default:                        return "UNDEFINED";
 272         }
 273 }
 274
 275 static inline const char *state_name(struct isp1301 *isp)
 276 {
 277         return state_string(isp->otg.state);
 278 }
 279
 280 /*-------------------------------------------------------------------------*/
 281
 282 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 283  * not everything is guarded by board-specific checks, or even using
 284  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 285  *
 286  * ALSO:  this currently doesn't use ISP1301 low-power modes
 287  * while OTG is running.
 288  */
 289
 290 static void power_down(struct isp1301 *isp)
 291 {
 292         isp->otg.state = OTG_STATE_UNDEFINED;
 293
 294         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 295         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 296
 297         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 298         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 299 }
 300
 301 static void power_up(struct isp1301 *isp)
 302 {
 303         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 304         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 305
 306         /* do this only when cpu is driving transceiver,
 307          * so host won't see a low speed device...
 308          */
 309         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 310 }
 311
 312 #define NO_HOST_SUSPEND
 313
 314 static int host_suspend(struct isp1301 *isp)
 315 {
 316 #ifdef  NO_HOST_SUSPEND
 317         return 0;
 318 #else
 319         struct device   *dev;
 320
 321         if (!isp->otg.host)
 322                 return -ENODEV;
 323
 324         /* Currently ASSUMES only the OTG port matters;
 325          * other ports could be active...
 326          */
 327         dev = isp->otg.host->controller;
 328         return dev->driver->suspend(dev, 3, 0);
 329 #endif
 330 }
 331
 332 static int host_resume(struct isp1301 *isp)
 333 {
 334 #ifdef  NO_HOST_SUSPEND
 335         return 0;
 336 #else
 337         struct device   *dev;
 338
 339         if (!isp->otg.host)
 340                 return -ENODEV;
 341
 342         dev = isp->otg.host->controller;
 343         return dev->driver->resume(dev, 0);
 344 #endif
 345 }
 346
 347 static int gadget_suspend(struct isp1301 *isp)
 348 {
 349         isp->otg.gadget->b_hnp_enable = 0;
 350         isp->otg.gadget->a_hnp_support = 0;
 351         isp->otg.gadget->a_alt_hnp_support = 0;
 352         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 353 }
 354
 355 /*-------------------------------------------------------------------------*/
 356
 357 #define TIMER_MINUTES   10
 358 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 359
 360 /* Almost all our I2C messaging comes from a work queue's task context.
 361  * NOTE: guaranteeing certain response times might mean we shouldn't
 362  * share keventd's work queue; a realtime task might be safest.
 363  */
 364 static void isp1301_defer_work(struct isp1301 *isp, int work)
 365 {
 366         int status;
 367
 368         if (isp && !test_and_set_bit(work, &isp->todo)) {
 369                 (void) get_device(&isp->client->dev);
 370                 status = schedule_work(&isp->work);
 371                 if (!status && !isp->working)
 372                         dev_vdbg(&isp->client->dev,
 373                                 "work item %d may be lost\n", work);
 374         }
 375 }
 376
 377 /* called from irq handlers */
 378 static void a_idle(struct isp1301 *isp, const char *tag)
 379 {
 380         u32 l;
 381
 382         if (isp->otg.state == OTG_STATE_A_IDLE)
 383                 return;
 384
 385         isp->otg.default_a = 1;
 386         if (isp->otg.host) {
 387                 isp->otg.host->is_b_host = 0;
 388                 host_suspend(isp);
 389         }
 390         if (isp->otg.gadget) {
 391                 isp->otg.gadget->is_a_peripheral = 1;
 392                 gadget_suspend(isp);
 393         }
 394         isp->otg.state = OTG_STATE_A_IDLE;
 395         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 396         omap_writel(l, OTG_CTRL);
 397         isp->last_otg_ctrl = l;
 398         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 399 }
 400
 401 /* called from irq handlers */
 402 static void b_idle(struct isp1301 *isp, const char *tag)
 403 {
 404         u32 l;
 405
 406         if (isp->otg.state == OTG_STATE_B_IDLE)
 407                 return;
 408
 409         isp->otg.default_a = 0;
 410         if (isp->otg.host) {
 411                 isp->otg.host->is_b_host = 1;
 412                 host_suspend(isp);
 413         }
 414         if (isp->otg.gadget) {
 415                 isp->otg.gadget->is_a_peripheral = 0;
 416                 gadget_suspend(isp);
 417         }
 418         isp->otg.state = OTG_STATE_B_IDLE;
 419         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 420         omap_writel(l, OTG_CTRL);
 421         isp->last_otg_ctrl = l;
 422         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 423 }
 424
 425 static void
 426 dump_regs(struct isp1301 *isp, const char *label)
 427 {
 428 #ifdef  DEBUG
 429         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 430         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 431         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 432
 433         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 434                 omap_readl(OTG_CTRL), label, state_name(isp),
 435                 ctrl, status, src);
 436         /* mode control and irq enables don't change much */
 437 #endif
 438 }
 439
 440 /*-------------------------------------------------------------------------*/
 441
 442 #ifdef  CONFIG_USB_OTG
 443
 444 /*
 445  * The OMAP OTG controller handles most of the OTG state transitions.
 446  *
 447  * We translate isp1301 outputs (mostly voltage comparator status) into
 448  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 449  * flags into isp1301 inputs ... and infer state transitions.
 450  */
 451
 452 #ifdef  VERBOSE
 453
 454 static void check_state(struct isp1301 *isp, const char *tag)
 455 {
 456         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 457         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 458         unsigned                extra = 0;
 459
 460         switch (fsm) {
 461
 462         /* default-b */
 463         case 0x0:
 464                 state = OTG_STATE_B_IDLE;
 465                 break;
 466         case 0x3:
 467         case 0x7:
 468                 extra = 1;
 469         case 0x1:
 470                 state = OTG_STATE_B_PERIPHERAL;
 471                 break;
 472         case 0x11:
 473                 state = OTG_STATE_B_SRP_INIT;
 474                 break;
 475
 476         /* extra dual-role default-b states */
 477         case 0x12:
 478         case 0x13:
 479         case 0x16:
 480                 extra = 1;
 481         case 0x17:
 482                 state = OTG_STATE_B_WAIT_ACON;
 483                 break;
 484         case 0x34:
 485                 state = OTG_STATE_B_HOST;
 486                 break;
 487
 488         /* default-a */
 489         case 0x36:
 490                 state = OTG_STATE_A_IDLE;
 491                 break;
 492         case 0x3c:
 493                 state = OTG_STATE_A_WAIT_VFALL;
 494                 break;
 495         case 0x7d:
 496                 state = OTG_STATE_A_VBUS_ERR;
 497                 break;
 498         case 0x9e:
 499         case 0x9f:
 500                 extra = 1;
 501         case 0x89:
 502                 state = OTG_STATE_A_PERIPHERAL;
 503                 break;
 504         case 0xb7:
 505                 state = OTG_STATE_A_WAIT_VRISE;
 506                 break;
 507         case 0xb8:
 508                 state = OTG_STATE_A_WAIT_BCON;
 509                 break;
 510         case 0xb9:
 511                 state = OTG_STATE_A_HOST;
 512                 break;
 513         case 0xba:
 514                 state = OTG_STATE_A_SUSPEND;
 515                 break;
 516         default:
 517                 break;
 518         }
 519         if (isp->otg.state == state && !extra)
 520                 return;
 521         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 522                 state_string(state), fsm, state_name(isp),
 523                 omap_readl(OTG_CTRL));
 524 }
 525
 526 #else
 527
 528 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 529
 530 #endif
 531
 532 /* outputs from ISP1301_INTERRUPT_SOURCE */
 533 static void update_otg1(struct isp1301 *isp, u8 int_src)
 534 {
 535         u32     otg_ctrl;
 536
 537         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 538         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 539         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 540
 541         if (int_src & INTR_SESS_VLD)
 542                 otg_ctrl |= OTG_ASESSVLD;
 543         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 544                 a_idle(isp, "vfall");
 545                 otg_ctrl &= ~OTG_CTRL_BITS;
 546         }
 547         if (int_src & INTR_VBUS_VLD)
 548                 otg_ctrl |= OTG_VBUSVLD;
 549         if (int_src & INTR_ID_GND) {            /* default-A */
 550                 if (isp->otg.state == OTG_STATE_B_IDLE
 551                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 552                         a_idle(isp, "init");
 553                         return;
 554                 }
 555         } else {                                /* default-B */
 556                 otg_ctrl |= OTG_ID;
 557                 if (isp->otg.state == OTG_STATE_A_IDLE
 558                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 559                         b_idle(isp, "init");
 560                         return;
 561                 }
 562         }
 563         omap_writel(otg_ctrl, OTG_CTRL);
 564 }
 565
 566 /* outputs from ISP1301_OTG_STATUS */
 567 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 568 {
 569         u32     otg_ctrl;
 570
 571         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 572         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 573         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 574         if (otg_status & OTG_B_SESS_VLD)
 575                 otg_ctrl |= OTG_BSESSVLD;
 576         else if (otg_status & OTG_B_SESS_END)
 577                 otg_ctrl |= OTG_BSESSEND;
 578         omap_writel(otg_ctrl, OTG_CTRL);
 579 }
 580
 581 /* inputs going to ISP1301 */
 582 static void otg_update_isp(struct isp1301 *isp)
 583 {
 584         u32     otg_ctrl, otg_change;
 585         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 586
 587         otg_ctrl = omap_readl(OTG_CTRL);
 588         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 589         isp->last_otg_ctrl = otg_ctrl;
 590         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 591
 592         switch (isp->otg.state) {
 593         case OTG_STATE_B_IDLE:
 594         case OTG_STATE_B_PERIPHERAL:
 595         case OTG_STATE_B_SRP_INIT:
 596                 if (!(otg_ctrl & OTG_PULLUP)) {
 597                         // if (otg_ctrl & OTG_B_HNPEN) {
 598                         if (isp->otg.gadget->b_hnp_enable) {
 599                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 600                                 pr_debug("  --> b_wait_acon\n");
 601                         }
 602                         goto pulldown;
 603                 }
 604 pullup:
 605                 set |= OTG1_DP_PULLUP;
 606                 clr |= OTG1_DP_PULLDOWN;
 607                 break;
 608         case OTG_STATE_A_SUSPEND:
 609         case OTG_STATE_A_PERIPHERAL:
 610                 if (otg_ctrl & OTG_PULLUP)
 611                         goto pullup;
 612                 /* FALLTHROUGH */
 613         // case OTG_STATE_B_WAIT_ACON:
 614         default:
 615 pulldown:
 616                 set |= OTG1_DP_PULLDOWN;
 617                 clr |= OTG1_DP_PULLUP;
 618                 break;
 619         }
 620
 621 #       define toggle(OTG,ISP) do { \
 622                 if (otg_ctrl & OTG) set |= ISP; \
 623                 else clr |= ISP; \
 624                 } while (0)
 625
 626         if (!(isp->otg.host))
 627                 otg_ctrl &= ~OTG_DRV_VBUS;
 628
 629         switch (isp->otg.state) {
 630         case OTG_STATE_A_SUSPEND:
 631                 if (otg_ctrl & OTG_DRV_VBUS) {
 632                         set |= OTG1_VBUS_DRV;
 633                         break;
 634                 }
 635                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 636                 notresponding(isp);
 637
 638                 /* FALLTHROUGH */
 639         case OTG_STATE_A_VBUS_ERR:
 640                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 641                 pr_debug("  --> a_wait_vfall\n");
 642                 /* FALLTHROUGH */
 643         case OTG_STATE_A_WAIT_VFALL:
 644                 /* FIXME usbcore thinks port power is still on ... */
 645                 clr |= OTG1_VBUS_DRV;
 646                 break;
 647         case OTG_STATE_A_IDLE:
 648                 if (otg_ctrl & OTG_DRV_VBUS) {
 649                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 650                         pr_debug("  --> a_wait_vrise\n");
 651                 }
 652                 /* FALLTHROUGH */
 653         default:
 654                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 655         }
 656
 657         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 658         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 659
 660 #       undef toggle
 661
 662         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 663         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 664
 665         /* HNP switch to host or peripheral; and SRP */
 666         if (otg_change & OTG_PULLUP) {
 667                 u32 l;
 668
 669                 switch (isp->otg.state) {
 670                 case OTG_STATE_B_IDLE:
 671                         if (clr & OTG1_DP_PULLUP)
 672                                 break;
 673                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 674                         pr_debug("  --> b_peripheral\n");
 675                         break;
 676                 case OTG_STATE_A_SUSPEND:
 677                         if (clr & OTG1_DP_PULLUP)
 678                                 break;
 679                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 680                         pr_debug("  --> a_peripheral\n");
 681                         break;
 682                 default:
 683                         break;
 684                 }
 685                 l = omap_readl(OTG_CTRL);
 686                 l |= OTG_PULLUP;
 687                 omap_writel(l, OTG_CTRL);
 688         }
 689
 690         check_state(isp, __func__);
 691         dump_regs(isp, "otg->isp1301");
 692 }
 693
 694 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 695 {
 696         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 697         u32             otg_ctrl;
 698         int             ret = IRQ_NONE;
 699         struct isp1301  *isp = _isp;
 700
 701         /* update ISP1301 transciever from OTG controller */
 702         if (otg_irq & OPRT_CHG) {
 703                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 704                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 705                 ret = IRQ_HANDLED;
 706
 707         /* SRP to become b_peripheral failed */
 708         } else if (otg_irq & B_SRP_TMROUT) {
 709                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 710                 notresponding(isp);
 711
 712                 /* gadget drivers that care should monitor all kinds of
 713                  * remote wakeup (SRP, normal) using their own timer
 714                  * to give "check cable and A-device" messages.
 715                  */
 716                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 717                         b_idle(isp, "srp_timeout");
 718
 719                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 720                 ret = IRQ_HANDLED;
 721
 722         /* HNP to become b_host failed */
 723         } else if (otg_irq & B_HNP_FAIL) {
 724                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 725                                 state_name(isp), omap_readl(OTG_CTRL));
 726                 notresponding(isp);
 727
 728                 otg_ctrl = omap_readl(OTG_CTRL);
 729                 otg_ctrl |= OTG_BUSDROP;
 730                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 731                 omap_writel(otg_ctrl, OTG_CTRL);
 732
 733                 /* subset of b_peripheral()... */
 734                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 735                 pr_debug("  --> b_peripheral\n");
 736
 737                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 738                 ret = IRQ_HANDLED;
 739
 740         /* detect SRP from B-device ... */
 741         } else if (otg_irq & A_SRP_DETECT) {
 742                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 743                                 state_name(isp), omap_readl(OTG_CTRL));
 744
 745                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 746                 switch (isp->otg.state) {
 747                 case OTG_STATE_A_IDLE:
 748                         if (!isp->otg.host)
 749                                 break;
 750                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 751                         otg_ctrl = omap_readl(OTG_CTRL);
 752                         otg_ctrl |= OTG_A_BUSREQ;
 753                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 754                                         & ~OTG_XCEIV_INPUTS
 755                                         & OTG_CTRL_MASK;
 756                         omap_writel(otg_ctrl, OTG_CTRL);
 757                         break;
 758                 default:
 759                         break;
 760                 }
 761
 762                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 763                 ret = IRQ_HANDLED;
 764
 765         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 766          * we don't track them separately
 767          */
 768         } else if (otg_irq & A_REQ_TMROUT) {
 769                 otg_ctrl = omap_readl(OTG_CTRL);
 770                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 771                                 state_name(isp), otg_ctrl);
 772                 notresponding(isp);
 773
 774                 otg_ctrl |= OTG_BUSDROP;
 775                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 776                 omap_writel(otg_ctrl, OTG_CTRL);
 777                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 778
 779                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 780                 ret = IRQ_HANDLED;
 781
 782         /* A-supplied voltage fell too low; overcurrent */
 783         } else if (otg_irq & A_VBUS_ERR) {
 784                 otg_ctrl = omap_readl(OTG_CTRL);
 785                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 786                         state_name(isp), otg_irq, otg_ctrl);
 787
 788                 otg_ctrl |= OTG_BUSDROP;
 789                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 790                 omap_writel(otg_ctrl, OTG_CTRL);
 791                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 792
 793                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 794                 ret = IRQ_HANDLED;
 795
 796         /* switch driver; the transciever code activates it,
 797          * ungating the udc clock or resuming OHCI.
 798          */
 799         } else if (otg_irq & DRIVER_SWITCH) {
 800                 int     kick = 0;
 801
 802                 otg_ctrl = omap_readl(OTG_CTRL);
 803                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 804                                 state_name(isp),
 805                                 (otg_ctrl & OTG_DRIVER_SEL)
 806                                         ? "gadget" : "host",
 807                                 otg_ctrl);
 808                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 809
 810                 /* role is peripheral */
 811                 if (otg_ctrl & OTG_DRIVER_SEL) {
 812                         switch (isp->otg.state) {
 813                         case OTG_STATE_A_IDLE:
 814                                 b_idle(isp, __func__);
 815                                 break;
 816                         default:
 817                                 break;
 818                         }
 819                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 820
 821                 /* role is host */
 822                 } else {
 823                         if (!(otg_ctrl & OTG_ID)) {
 824                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 825                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 826                         }
 827
 828                         if (isp->otg.host) {
 829                                 switch (isp->otg.state) {
 830                                 case OTG_STATE_B_WAIT_ACON:
 831                                         isp->otg.state = OTG_STATE_B_HOST;
 832                                         pr_debug("  --> b_host\n");
 833                                         kick = 1;
 834                                         break;
 835                                 case OTG_STATE_A_WAIT_BCON:
 836                                         isp->otg.state = OTG_STATE_A_HOST;
 837                                         pr_debug("  --> a_host\n");
 838                                         break;
 839                                 case OTG_STATE_A_PERIPHERAL:
 840                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 841                                         pr_debug("  --> a_wait_bcon\n");
 842                                         break;
 843                                 default:
 844                                         break;
 845                                 }
 846                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 847                         }
 848                 }
 849
 850                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 851                 ret = IRQ_HANDLED;
 852
 853                 if (kick)
 854                         usb_bus_start_enum(isp->otg.host,
 855                                                 isp->otg.host->otg_port);
 856         }
 857
 858         check_state(isp, __func__);
 859         return ret;
 860 }
 861
 862 static struct platform_device *otg_dev;
 863
 864 static int otg_init(struct isp1301 *isp)
 865 {
 866         u32 l;
 867
 868         if (!otg_dev)
 869                 return -ENODEV;
 870
 871         dump_regs(isp, __func__);
 872         /* some of these values are board-specific... */
 873         l = omap_readl(OTG_SYSCON_2);
 874         l |= OTG_EN
 875                 /* for B-device: */
 876                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 877                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 878                 // | (3 << 24)          /* 2msec VBUS pulse */
 879                 /* for A-device: */
 880                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 881                 | SRP_DPW               /* detect 167+ns SRP pulses */
 882                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 883                 ;
 884         omap_writel(l, OTG_SYSCON_2);
 885
 886         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 887         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 888
 889         check_state(isp, __func__);
 890         pr_debug("otg: %s, %s %06x\n",
 891                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 892
 893         omap_writew(DRIVER_SWITCH | OPRT_CHG
 894                         | B_SRP_TMROUT | B_HNP_FAIL
 895                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 896
 897         l = omap_readl(OTG_SYSCON_2);
 898         l |= OTG_EN;
 899         omap_writel(l, OTG_SYSCON_2);
 900
 901         return 0;
 902 }
 903
 904 static int otg_probe(struct platform_device *dev)
 905 {
 906         // struct omap_usb_config *config = dev->platform_data;
 907
 908         otg_dev = dev;
 909         return 0;
 910 }
 911
 912 static int otg_remove(struct platform_device *dev)
 913 {
 914         otg_dev = NULL;
 915         return 0;
 916 }
 917
 918 static struct platform_driver omap_otg_driver = {
 919         .probe          = otg_probe,
 920         .remove         = otg_remove,
 921         .driver         = {
 922                 .owner  = THIS_MODULE,
 923                 .name   = "omap_otg",
 924         },
 925 };
 926
 927 static int otg_bind(struct isp1301 *isp)
 928 {
 929         int     status;
 930
 931         if (otg_dev)
 932                 return -EBUSY;
 933
 934         status = platform_driver_register(&omap_otg_driver);
 935         if (status < 0)
 936                 return status;
 937
 938         if (otg_dev)
 939                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 940                                 IRQF_DISABLED, DRIVER_NAME, isp);
 941         else
 942                 status = -ENODEV;
 943
 944         if (status < 0)
 945                 platform_driver_unregister(&omap_otg_driver);
 946         return status;
 947 }
 948
 949 static void otg_unbind(struct isp1301 *isp)
 950 {
 951         if (!otg_dev)
 952                 return;
 953         free_irq(otg_dev->resource[1].start, isp);
 954 }
 955
 956 #else
 957
 958 /* OTG controller isn't clocked */
 959
 960 #endif  /* CONFIG_USB_OTG */
 961
 962 /*-------------------------------------------------------------------------*/
 963
 964 static void b_peripheral(struct isp1301 *isp)
 965 {
 966         u32 l;
 967
 968         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 969         omap_writel(l, OTG_CTRL);
 970
 971         usb_gadget_vbus_connect(isp->otg.gadget);
 972
 973 #ifdef  CONFIG_USB_OTG
 974         enable_vbus_draw(isp, 8);
 975         otg_update_isp(isp);
 976 #else
 977         enable_vbus_draw(isp, 100);
 978         /* UDC driver just set OTG_BSESSVLD */
 979         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 980         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 981         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 982         pr_debug("  --> b_peripheral\n");
 983         dump_regs(isp, "2periph");
 984 #endif
 985 }
 986
 987 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 988 {
 989         u8                      isp_stat, isp_bstat;
 990         enum usb_otg_state      state = isp->otg.state;
 991
 992         if (stat & INTR_BDIS_ACON)
 993                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 994
 995         /* start certain state transitions right away */
 996         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 997         if (isp_stat & INTR_ID_GND) {
 998                 if (isp->otg.default_a) {
 999                         switch (state) {
1000                         case OTG_STATE_B_IDLE:
1001                                 a_idle(isp, "idle");
1002                                 /* FALLTHROUGH */
1003                         case OTG_STATE_A_IDLE:
1004                                 enable_vbus_source(isp);
1005                                 /* FALLTHROUGH */
1006                         case OTG_STATE_A_WAIT_VRISE:
1007                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
1008                                  * the HC will transition to A_HOST (or
1009                                  * A_SUSPEND!) without our noticing except
1010                                  * when HNP is used.
1011                                  */
1012                                 if (isp_stat & INTR_VBUS_VLD)
1013                                         isp->otg.state = OTG_STATE_A_HOST;
1014                                 break;
1015                         case OTG_STATE_A_WAIT_VFALL:
1016                                 if (!(isp_stat & INTR_SESS_VLD))
1017                                         a_idle(isp, "vfell");
1018                                 break;
1019                         default:
1020                                 if (!(isp_stat & INTR_VBUS_VLD))
1021                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1022                                 break;
1023                         }
1024                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1025                 } else {
1026                         switch (state) {
1027                         case OTG_STATE_B_PERIPHERAL:
1028                         case OTG_STATE_B_HOST:
1029                         case OTG_STATE_B_WAIT_ACON:
1030                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1031                                 break;
1032                         default:
1033                                 break;
1034                         }
1035                         if (state != OTG_STATE_A_IDLE)
1036                                 a_idle(isp, "id");
1037                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1038                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1039                         isp_bstat = 0;
1040                 }
1041         } else {
1042                 u32 l;
1043
1044                 /* if user unplugged mini-A end of cable,
1045                  * don't bypass A_WAIT_VFALL.
1046                  */
1047                 if (isp->otg.default_a) {
1048                         switch (state) {
1049                         default:
1050                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1051                                 break;
1052                         case OTG_STATE_A_WAIT_VFALL:
1053                                 state = OTG_STATE_A_IDLE;
1054                                 /* khubd may take a while to notice and
1055                                  * handle this disconnect, so don't go
1056                                  * to B_IDLE quite yet.
1057                                  */
1058                                 break;
1059                         case OTG_STATE_A_IDLE:
1060                                 host_suspend(isp);
1061                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1062                                                 MC1_BDIS_ACON_EN);
1063                                 isp->otg.state = OTG_STATE_B_IDLE;
1064                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1065                                 l &= ~OTG_CTRL_BITS;
1066                                 omap_writel(l, OTG_CTRL);
1067                                 break;
1068                         case OTG_STATE_B_IDLE:
1069                                 break;
1070                         }
1071                 }
1072                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1073
1074                 switch (isp->otg.state) {
1075                 case OTG_STATE_B_PERIPHERAL:
1076                 case OTG_STATE_B_WAIT_ACON:
1077                 case OTG_STATE_B_HOST:
1078                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1079                                 break;
1080                         enable_vbus_draw(isp, 0);
1081 #ifndef CONFIG_USB_OTG
1082                         /* UDC driver will clear OTG_BSESSVLD */
1083                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1084                                                 OTG1_DP_PULLDOWN);
1085                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1086                                                 OTG1_DP_PULLUP);
1087                         dump_regs(isp, __func__);
1088 #endif
1089                         /* FALLTHROUGH */
1090                 case OTG_STATE_B_SRP_INIT:
1091                         b_idle(isp, __func__);
1092                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1093                         omap_writel(l, OTG_CTRL);
1094                         /* FALLTHROUGH */
1095                 case OTG_STATE_B_IDLE:
1096                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1097 #ifdef  CONFIG_USB_OTG
1098                                 update_otg1(isp, isp_stat);
1099                                 update_otg2(isp, isp_bstat);
1100 #endif
1101                                 b_peripheral(isp);
1102                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1103                                 isp_bstat |= OTG_B_SESS_END;
1104                         break;
1105                 case OTG_STATE_A_WAIT_VFALL:
1106                         break;
1107                 default:
1108                         pr_debug("otg: unsupported b-device %s\n",
1109                                 state_name(isp));
1110                         break;
1111                 }
1112         }
1113
1114         if (state != isp->otg.state)
1115                 pr_debug("  isp, %s -> %s\n",
1116                                 state_string(state), state_name(isp));
1117
1118 #ifdef  CONFIG_USB_OTG
1119         /* update the OTG controller state to match the isp1301; may
1120          * trigger OPRT_CHG irqs for changes going to the isp1301.
1121          */
1122         update_otg1(isp, isp_stat);
1123         update_otg2(isp, isp_bstat);
1124         check_state(isp, __func__);
1125 #endif
1126
1127         dump_regs(isp, "isp1301->otg");
1128 }
1129
1130 /*-------------------------------------------------------------------------*/
1131
1132 static u8 isp1301_clear_latch(struct isp1301 *isp)
1133 {
1134         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1135         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1136         return latch;
1137 }
1138
1139 static void
1140 isp1301_work(struct work_struct *work)
1141 {
1142         struct isp1301  *isp = container_of(work, struct isp1301, work);
1143         int             stop;
1144
1145         /* implicit lock:  we're the only task using this device */
1146         isp->working = 1;
1147         do {
1148                 stop = test_bit(WORK_STOP, &isp->todo);
1149
1150 #ifdef  CONFIG_USB_OTG
1151                 /* transfer state from otg engine to isp1301 */
1152                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1153                         otg_update_isp(isp);
1154                         put_device(&isp->client->dev);
1155                 }
1156 #endif
1157                 /* transfer state from isp1301 to otg engine */
1158                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1159                         u8              stat = isp1301_clear_latch(isp);
1160
1161                         isp_update_otg(isp, stat);
1162                         put_device(&isp->client->dev);
1163                 }
1164
1165                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1166                         u32     otg_ctrl;
1167
1168                         /*
1169                          * skip A_WAIT_VRISE; hc transitions invisibly
1170                          * skip A_WAIT_BCON; same.
1171                          */
1172                         switch (isp->otg.state) {
1173                         case OTG_STATE_A_WAIT_BCON:
1174                         case OTG_STATE_A_WAIT_VRISE:
1175                                 isp->otg.state = OTG_STATE_A_HOST;
1176                                 pr_debug("  --> a_host\n");
1177                                 otg_ctrl = omap_readl(OTG_CTRL);
1178                                 otg_ctrl |= OTG_A_BUSREQ;
1179                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1180                                                 & OTG_CTRL_MASK;
1181                                 omap_writel(otg_ctrl, OTG_CTRL);
1182                                 break;
1183                         case OTG_STATE_B_WAIT_ACON:
1184                                 isp->otg.state = OTG_STATE_B_HOST;
1185                                 pr_debug("  --> b_host (acon)\n");
1186                                 break;
1187                         case OTG_STATE_B_HOST:
1188                         case OTG_STATE_B_IDLE:
1189                         case OTG_STATE_A_IDLE:
1190                                 break;
1191                         default:
1192                                 pr_debug("  host resume in %s\n",
1193                                                 state_name(isp));
1194                         }
1195                         host_resume(isp);
1196                         // mdelay(10);
1197                         put_device(&isp->client->dev);
1198                 }
1199
1200                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1201 #ifdef  VERBOSE
1202                         dump_regs(isp, "timer");
1203                         if (!stop)
1204                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1205 #endif
1206                         put_device(&isp->client->dev);
1207                 }
1208
1209                 if (isp->todo)
1210                         dev_vdbg(&isp->client->dev,
1211                                 "work done, todo = 0x%lx\n",
1212                                 isp->todo);
1213                 if (stop) {
1214                         dev_dbg(&isp->client->dev, "stop\n");
1215                         break;
1216                 }
1217         } while (isp->todo);
1218         isp->working = 0;
1219 }
1220
1221 static irqreturn_t isp1301_irq(int irq, void *isp)
1222 {
1223         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1224         return IRQ_HANDLED;
1225 }
1226
1227 static void isp1301_timer(unsigned long _isp)
1228 {
1229         isp1301_defer_work((void *)_isp, WORK_TIMER);
1230 }
1231
1232 /*-------------------------------------------------------------------------*/
1233
1234 static void isp1301_release(struct device *dev)
1235 {
1236         struct isp1301  *isp;
1237
1238         isp = dev_get_drvdata(dev);
1239
1240         /* FIXME -- not with a "new style" driver, it doesn't!! */
1241
1242         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1243         if (isp->i2c_release)
1244                 isp->i2c_release(dev);
1245         kfree (isp);
1246 }
1247
1248 static struct isp1301 *the_transceiver;
1249
1250 static int __exit isp1301_remove(struct i2c_client *i2c)
1251 {
1252         struct isp1301  *isp;
1253
1254         isp = i2c_get_clientdata(i2c);
1255
1256         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1257         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1258         free_irq(i2c->irq, isp);
1259 #ifdef  CONFIG_USB_OTG
1260         otg_unbind(isp);
1261 #endif
1262         if (machine_is_omap_h2())
1263                 gpio_free(2);
1264
1265         isp->timer.data = 0;
1266         set_bit(WORK_STOP, &isp->todo);
1267         del_timer_sync(&isp->timer);
1268         flush_scheduled_work();
1269
1270         put_device(&i2c->dev);
1271         the_transceiver = NULL;
1272
1273         return 0;
1274 }
1275
1276 /*-------------------------------------------------------------------------*/
1277
1278 /* NOTE:  three modes are possible here, only one of which
1279  * will be standards-conformant on any given system:
1280  *
1281  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1282  *  - HOST mode, for when there's one or more A (host) connectors
1283  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1284  *
1285  * As a rule, you won't have an isp1301 chip unless it's there to
1286  * support the OTG mode.  Other modes help testing USB controllers
1287  * in isolation from (full) OTG support, or maybe so later board
1288  * revisions can help to support those feature.
1289  */
1290
1291 #ifdef  CONFIG_USB_OTG
1292
1293 static int isp1301_otg_enable(struct isp1301 *isp)
1294 {
1295         power_up(isp);
1296         otg_init(isp);
1297
1298         /* NOTE:  since we don't change this, this provides
1299          * a few more interrupts than are strictly needed.
1300          */
1301         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1302                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1303         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1304                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1305
1306         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1307
1308         return 0;
1309 }
1310
1311 #endif
1312
1313 /* add or disable the host device+driver */
1314 static int
1315 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1316 {
1317         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1318
1319         if (!otg || isp != the_transceiver)
1320                 return -ENODEV;
1321
1322         if (!host) {
1323                 omap_writew(0, OTG_IRQ_EN);
1324                 power_down(isp);
1325                 isp->otg.host = NULL;
1326                 return 0;
1327         }
1328
1329 #ifdef  CONFIG_USB_OTG
1330         isp->otg.host = host;
1331         dev_dbg(&isp->client->dev, "registered host\n");
1332         host_suspend(isp);
1333         if (isp->otg.gadget)
1334                 return isp1301_otg_enable(isp);
1335         return 0;
1336
1337 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1338         // FIXME update its refcount
1339         isp->otg.host = host;
1340
1341         power_up(isp);
1342
1343         if (machine_is_omap_h2())
1344                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1345
1346         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1347         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1348                 INTR_ID_GND);
1349         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1350                 INTR_ID_GND);
1351
1352         /* If this has a Mini-AB connector, this mode is highly
1353          * nonstandard ... but can be handy for testing, especially with
1354          * the Mini-A end of an OTG cable.  (Or something nonstandard
1355          * like MiniB-to-StandardB, maybe built with a gender mender.)
1356          */
1357         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1358
1359         dump_regs(isp, __func__);
1360
1361         return 0;
1362
1363 #else
1364         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1365         return -EINVAL;
1366 #endif
1367
1368 }
1369
1370 static int
1371 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1372 {
1373         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1374 #ifndef CONFIG_USB_OTG
1375         u32 l;
1376 #endif
1377
1378         if (!otg || isp != the_transceiver)
1379                 return -ENODEV;
1380
1381         if (!gadget) {
1382                 omap_writew(0, OTG_IRQ_EN);
1383                 if (!isp->otg.default_a)
1384                         enable_vbus_draw(isp, 0);
1385                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1386                 isp->otg.gadget = NULL;
1387                 power_down(isp);
1388                 return 0;
1389         }
1390
1391 #ifdef  CONFIG_USB_OTG
1392         isp->otg.gadget = gadget;
1393         dev_dbg(&isp->client->dev, "registered gadget\n");
1394         /* gadget driver may be suspended until vbus_connect () */
1395         if (isp->otg.host)
1396                 return isp1301_otg_enable(isp);
1397         return 0;
1398
1399 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1400         isp->otg.gadget = gadget;
1401         // FIXME update its refcount
1402
1403         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1404         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1405         l |= OTG_ID;
1406         omap_writel(l, OTG_CTRL);
1407
1408         power_up(isp);
1409         isp->otg.state = OTG_STATE_B_IDLE;
1410
1411         if (machine_is_omap_h2() || machine_is_omap_h3())
1412                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1413
1414         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1415                 INTR_SESS_VLD);
1416         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1417                 INTR_VBUS_VLD);
1418         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1419         dump_regs(isp, __func__);
1420
1421         /* If this has a Mini-AB connector, this mode is highly
1422          * nonstandard ... but can be handy for testing, so long
1423          * as you don't plug a Mini-A cable into the jack.
1424          */
1425         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1426                 b_peripheral(isp);
1427
1428         return 0;
1429
1430 #else
1431         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1432         return -EINVAL;
1433 #endif
1434 }
1435
1436
1437 /*-------------------------------------------------------------------------*/
1438
1439 static int
1440 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1441 {
1442         if (!the_transceiver)
1443                 return -ENODEV;
1444         if (dev->state == OTG_STATE_B_PERIPHERAL)
1445                 enable_vbus_draw(the_transceiver, mA);
1446         return 0;
1447 }
1448
1449 static int
1450 isp1301_start_srp(struct otg_transceiver *dev)
1451 {
1452         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1453         u32             otg_ctrl;
1454
1455         if (!dev || isp != the_transceiver
1456                         || isp->otg.state != OTG_STATE_B_IDLE)
1457                 return -ENODEV;
1458
1459         otg_ctrl = omap_readl(OTG_CTRL);
1460         if (!(otg_ctrl & OTG_BSESSEND))
1461                 return -EINVAL;
1462
1463         otg_ctrl |= OTG_B_BUSREQ;
1464         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1465         omap_writel(otg_ctrl, OTG_CTRL);
1466         isp->otg.state = OTG_STATE_B_SRP_INIT;
1467
1468         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1469                         omap_readl(OTG_CTRL));
1470 #ifdef  CONFIG_USB_OTG
1471         check_state(isp, __func__);
1472 #endif
1473         return 0;
1474 }
1475
1476 static int
1477 isp1301_start_hnp(struct otg_transceiver *dev)
1478 {
1479 #ifdef  CONFIG_USB_OTG
1480         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1481         u32 l;
1482
1483         if (!dev || isp != the_transceiver)
1484                 return -ENODEV;
1485         if (isp->otg.default_a && (isp->otg.host == NULL
1486                         || !isp->otg.host->b_hnp_enable))
1487                 return -ENOTCONN;
1488         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1489                         || !isp->otg.gadget->b_hnp_enable))
1490                 return -ENOTCONN;
1491
1492         /* We want hardware to manage most HNP protocol timings.
1493          * So do this part as early as possible...
1494          */
1495         switch (isp->otg.state) {
1496         case OTG_STATE_B_HOST:
1497                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1498                 /* caller will suspend next */
1499                 break;
1500         case OTG_STATE_A_HOST:
1501 #if 0
1502                 /* autoconnect mode avoids irq latency bugs */
1503                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1504                                 MC1_BDIS_ACON_EN);
1505 #endif
1506                 /* caller must suspend then clear A_BUSREQ */
1507                 usb_gadget_vbus_connect(isp->otg.gadget);
1508                 l = omap_readl(OTG_CTRL);
1509                 l |= OTG_A_SETB_HNPEN;
1510                 omap_writel(l, OTG_CTRL);
1511
1512                 break;
1513         case OTG_STATE_A_PERIPHERAL:
1514                 /* initiated by B-Host suspend */
1515                 break;
1516         default:
1517                 return -EILSEQ;
1518         }
1519         pr_debug("otg: HNP %s, %06x ...\n",
1520                 state_name(isp), omap_readl(OTG_CTRL));
1521         check_state(isp, __func__);
1522         return 0;
1523 #else
1524         /* srp-only */
1525         return -EINVAL;
1526 #endif
1527 }
1528
1529 /*-------------------------------------------------------------------------*/
1530
1531 static int __init
1532 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1533 {
1534         int                     status;
1535         struct isp1301          *isp;
1536
1537         if (the_transceiver)
1538                 return 0;
1539
1540         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1541         if (!isp)
1542                 return 0;
1543
1544         INIT_WORK(&isp->work, isp1301_work);
1545         init_timer(&isp->timer);
1546         isp->timer.function = isp1301_timer;
1547         isp->timer.data = (unsigned long) isp;
1548
1549         i2c_set_clientdata(i2c, isp);
1550         isp->client = i2c;
1551
1552         /* verify the chip (shouldn't be necesary) */
1553         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1554         if (status != I2C_VENDOR_ID_PHILIPS) {
1555                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1556                 goto fail;
1557         }
1558         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1559         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1560                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1561                 goto fail;
1562         }
1563         isp->i2c_release = i2c->dev.release;
1564         i2c->dev.release = isp1301_release;
1565
1566         /* initial development used chiprev 2.00 */
1567         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1568         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1569                 status >> 8, status & 0xff);
1570
1571         /* make like power-on reset */
1572         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1573
1574         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1575         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1576
1577         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1578                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1579         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1580                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1581
1582         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1583         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1584         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1585
1586 #ifdef  CONFIG_USB_OTG
1587         status = otg_bind(isp);
1588         if (status < 0) {
1589                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1590                 goto fail;
1591         }
1592 #endif
1593
1594         if (machine_is_omap_h2()) {
1595                 /* full speed signaling by default */
1596                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1597                         MC1_SPEED);
1598                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1599                         MC2_SPD_SUSP_CTRL);
1600
1601                 /* IRQ wired at M14 */
1602                 omap_cfg_reg(M14_1510_GPIO2);
1603                 if (gpio_request(2, "isp1301") == 0)
1604                         gpio_direction_input(2);
1605                 isp->irq_type = IRQF_TRIGGER_FALLING;
1606         }
1607
1608         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1609         status = request_irq(i2c->irq, isp1301_irq,
1610                         isp->irq_type, DRIVER_NAME, isp);
1611         if (status < 0) {
1612                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1613                                 i2c->irq, status);
1614                 goto fail;
1615         }
1616
1617         isp->otg.dev = &i2c->dev;
1618         isp->otg.label = DRIVER_NAME;
1619
1620         isp->otg.set_host = isp1301_set_host,
1621         isp->otg.set_peripheral = isp1301_set_peripheral,
1622         isp->otg.set_power = isp1301_set_power,
1623         isp->otg.start_srp = isp1301_start_srp,
1624         isp->otg.start_hnp = isp1301_start_hnp,
1625
1626         enable_vbus_draw(isp, 0);
1627         power_down(isp);
1628         the_transceiver = isp;
1629
1630 #ifdef  CONFIG_USB_OTG
1631         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1632         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1633 #endif
1634
1635         dump_regs(isp, __func__);
1636
1637 #ifdef  VERBOSE
1638         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1639         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1640 #endif
1641
1642         status = otg_set_transceiver(&isp->otg);
1643         if (status < 0)
1644                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1645                         status);
1646
1647         return 0;
1648
1649 fail:
1650         kfree(isp);
1651         return -ENODEV;
1652 }
1653
1654 static const struct i2c_device_id isp1301_id[] = {
1655         { "isp1301_omap", 0 },
1656         { }
1657 };
1658 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1659
1660 static struct i2c_driver isp1301_driver = {
1661         .driver = {
1662                 .name   = "isp1301_omap",
1663         },
1664         .probe          = isp1301_probe,
1665         .remove         = __exit_p(isp1301_remove),
1666         .id_table       = isp1301_id,
1667 };
1668
1669 /*-------------------------------------------------------------------------*/
1670
1671 static int __init isp_init(void)
1672 {
1673         return i2c_add_driver(&isp1301_driver);
1674 }
1675 module_init(isp_init);
1676
1677 static void __exit isp_exit(void)
1678 {
1679         if (the_transceiver)
1680                 otg_set_transceiver(NULL);
1681         i2c_del_driver(&isp1301_driver);
1682 }
1683 module_exit(isp_exit);
1684