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/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/io.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_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 #include <asm/arch/usb.h>
  38
  39 #include <asm/mach-types.h> /* FIXME: Move machine_is_* to board-*.c files */
  40
  41 #ifndef DEBUG
  42 #undef  VERBOSE
  43 #endif
  44
  45 #define DRIVER_VERSION  "24 August 2004"
  46 #define DRIVER_NAME     (isp1301_driver.driver.name)
  47
  48 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  49 MODULE_LICENSE("GPL");
  50
  51 struct isp1301 {
  52         struct otg_transceiver  otg;
  53         struct i2c_client       *client;
  54         void                    (*i2c_release)(struct device *dev);
  55
  56         u32                     last_otg_ctrl;
  57         unsigned                working:1;
  58
  59         struct timer_list       timer;
  60
  61         /* use keventd context to change the state for us */
  62         struct work_struct      work;
  63
  64         unsigned long           todo;
  65 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  66 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  67 #               define WORK_HOST_RESUME 4       /* resume host */
  68 #               define WORK_TIMER       6       /* timer fired */
  69 #               define WORK_STOP        7       /* don't resubmit */
  70 };
  71
  72
  73 /* bits in OTG_CTRL */
  74
  75 #define OTG_XCEIV_OUTPUTS \
  76         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  77 #define OTG_XCEIV_INPUTS \
  78         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  79 #define OTG_CTRL_BITS \
  80         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  81         /* and OTG_PULLUP is sometimes written */
  82
  83 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  84         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  85         OTG_CTRL_BITS)
  86
  87
  88 /*-------------------------------------------------------------------------*/
  89
  90 #if     defined(CONFIG_MACH_OMAP_H2) || \
  91         defined(CONFIG_MACH_OMAP_H3)
  92
  93 /* board-specific PM hooks */
  94
  95
  96 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
  97
  98 #include <linux/i2c/tps65010.h>
  99
 100 #else
 101
 102 static inline int tps65010_set_vbus_draw(unsigned mA)
 103 {
 104         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 105         return 0;
 106 }
 107
 108 #endif
 109
 110 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 111 {
 112         int status = tps65010_set_vbus_draw(mA);
 113         if (status < 0)
 114                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 115 }
 116
 117 static void enable_vbus_source(struct isp1301 *isp)
 118 {
 119         /* this board won't supply more than 8mA vbus power.
 120          * some boards can switch a 100ma "unit load" (or more).
 121          */
 122 }
 123
 124
 125 #else
 126
 127 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 128 {
 129         pr_debug("%s UNIMPL\n", __FUNCTION__);
 130 }
 131
 132 static void enable_vbus_source(struct isp1301 *isp)
 133 {
 134         pr_debug("%s UNIMPL\n", __FUNCTION__);
 135 }
 136
 137 #endif
 138
 139 /*-------------------------------------------------------------------------*/
 140
 141 /* products will deliver OTG messages with LEDs, GUI, etc */
 142 static inline void notresponding(struct isp1301 *isp)
 143 {
 144         printk(KERN_NOTICE "OTG device not responding.\n");
 145 }
 146
 147 /*-------------------------------------------------------------------------*/
 148
 149 /* only two addresses possible */
 150 static struct i2c_driver isp1301_driver;
 151
 152 /* smbus apis are used for portability */
 153
 154 static inline u8
 155 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 156 {
 157         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 158 }
 159
 160 static inline int
 161 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 162 {
 163         return i2c_smbus_read_word_data(isp->client, reg);
 164 }
 165
 166 static inline int
 167 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 168 {
 169         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 170 }
 171
 172 static inline int
 173 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 174 {
 175         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 176 }
 177
 178 /*-------------------------------------------------------------------------*/
 179
 180 /* identification */
 181 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 182 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 183 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 184
 185 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 186 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 187
 188 /* operational registers */
 189 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 190 #       define  MC1_SPEED               (1 << 0)
 191 #       define  MC1_SUSPEND             (1 << 1)
 192 #       define  MC1_DAT_SE0             (1 << 2)
 193 #       define  MC1_TRANSPARENT         (1 << 3)
 194 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 195 #       define  MC1_OE_INT_EN           (1 << 5)
 196 #       define  MC1_UART_EN             (1 << 6)
 197 #       define  MC1_MASK                0x7f
 198 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 199 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 200 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 201 #       define  MC2_BI_DI               (1 << 2)
 202 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 203 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 204 #       define  MC2_AUDIO_EN            (1 << 5)
 205 #       define  MC2_PSW_EN              (1 << 6)
 206 #       define  MC2_EN2V7               (1 << 7)
 207 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 208 #       define  OTG1_DP_PULLUP          (1 << 0)
 209 #       define  OTG1_DM_PULLUP          (1 << 1)
 210 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 211 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 212 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 213 #       define  OTG1_VBUS_DRV           (1 << 5)
 214 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 215 #       define  OTG1_VBUS_CHRG          (1 << 7)
 216 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 217 #       define  OTG_B_SESS_END          (1 << 6)
 218 #       define  OTG_B_SESS_VLD          (1 << 7)
 219
 220 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 221 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 222
 223 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 224 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 225
 226 /* same bitfields in all interrupt registers */
 227 #       define  INTR_VBUS_VLD           (1 << 0)
 228 #       define  INTR_SESS_VLD           (1 << 1)
 229 #       define  INTR_DP_HI              (1 << 2)
 230 #       define  INTR_ID_GND             (1 << 3)
 231 #       define  INTR_DM_HI              (1 << 4)
 232 #       define  INTR_ID_FLOAT           (1 << 5)
 233 #       define  INTR_BDIS_ACON          (1 << 6)
 234 #       define  INTR_CR_INT             (1 << 7)
 235
 236 /*-------------------------------------------------------------------------*/
 237
 238 static const char *state_string(enum usb_otg_state state)
 239 {
 240         switch (state) {
 241         case OTG_STATE_A_IDLE:          return "a_idle";
 242         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 243         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 244         case OTG_STATE_A_HOST:          return "a_host";
 245         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 246         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 247         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 248         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 249         case OTG_STATE_B_IDLE:          return "b_idle";
 250         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 251         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 252         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 253         case OTG_STATE_B_HOST:          return "b_host";
 254         default:                        return "UNDEFINED";
 255         }
 256 }
 257
 258 static inline const char *state_name(struct isp1301 *isp)
 259 {
 260         return state_string(isp->otg.state);
 261 }
 262
 263 /*-------------------------------------------------------------------------*/
 264
 265 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 266  * not everything is guarded by board-specific checks, or even using
 267  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 268  *
 269  * ALSO:  this currently doesn't use ISP1301 low-power modes
 270  * while OTG is running.
 271  */
 272
 273 static void power_down(struct isp1301 *isp)
 274 {
 275         isp->otg.state = OTG_STATE_UNDEFINED;
 276
 277         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 278         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 279
 280         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 281         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 282 }
 283
 284 static void power_up(struct isp1301 *isp)
 285 {
 286         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 287         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 288
 289         /* do this only when cpu is driving transceiver,
 290          * so host won't see a low speed device...
 291          */
 292         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 293 }
 294
 295 #define NO_HOST_SUSPEND
 296
 297 static int host_suspend(struct isp1301 *isp)
 298 {
 299 #ifdef  NO_HOST_SUSPEND
 300         return 0;
 301 #else
 302         struct device   *dev;
 303
 304         if (!isp->otg.host)
 305                 return -ENODEV;
 306
 307         /* Currently ASSUMES only the OTG port matters;
 308          * other ports could be active...
 309          */
 310         dev = isp->otg.host->controller;
 311         return dev->driver->suspend(dev, 3, 0);
 312 #endif
 313 }
 314
 315 static int host_resume(struct isp1301 *isp)
 316 {
 317 #ifdef  NO_HOST_SUSPEND
 318         return 0;
 319 #else
 320         struct device   *dev;
 321
 322         if (!isp->otg.host)
 323                 return -ENODEV;
 324
 325         dev = isp->otg.host->controller;
 326         return dev->driver->resume(dev, 0);
 327 #endif
 328 }
 329
 330 static int gadget_suspend(struct isp1301 *isp)
 331 {
 332         isp->otg.gadget->b_hnp_enable = 0;
 333         isp->otg.gadget->a_hnp_support = 0;
 334         isp->otg.gadget->a_alt_hnp_support = 0;
 335         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 336 }
 337
 338 /*-------------------------------------------------------------------------*/
 339
 340 #define TIMER_MINUTES   10
 341 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 342
 343 /* Almost all our I2C messaging comes from a work queue's task context.
 344  * NOTE: guaranteeing certain response times might mean we shouldn't
 345  * share keventd's work queue; a realtime task might be safest.
 346  */
 347 void
 348 isp1301_defer_work(struct isp1301 *isp, int work)
 349 {
 350         int status;
 351
 352         if (isp && !test_and_set_bit(work, &isp->todo)) {
 353                 (void) get_device(&isp->client->dev);
 354                 status = schedule_work(&isp->work);
 355                 if (!status && !isp->working)
 356                         dev_vdbg(&isp->client->dev,
 357                                 "work item %d may be lost\n", work);
 358         }
 359 }
 360
 361 /* called from irq handlers */
 362 static void a_idle(struct isp1301 *isp, const char *tag)
 363 {
 364         u32 l;
 365
 366         if (isp->otg.state == OTG_STATE_A_IDLE)
 367                 return;
 368
 369         isp->otg.default_a = 1;
 370         if (isp->otg.host) {
 371                 isp->otg.host->is_b_host = 0;
 372                 host_suspend(isp);
 373         }
 374         if (isp->otg.gadget) {
 375                 isp->otg.gadget->is_a_peripheral = 1;
 376                 gadget_suspend(isp);
 377         }
 378         isp->otg.state = OTG_STATE_A_IDLE;
 379         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 380         omap_writel(l, OTG_CTRL);
 381         isp->last_otg_ctrl = l;
 382         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 383 }
 384
 385 /* called from irq handlers */
 386 static void b_idle(struct isp1301 *isp, const char *tag)
 387 {
 388         u32 l;
 389
 390         if (isp->otg.state == OTG_STATE_B_IDLE)
 391                 return;
 392
 393         isp->otg.default_a = 0;
 394         if (isp->otg.host) {
 395                 isp->otg.host->is_b_host = 1;
 396                 host_suspend(isp);
 397         }
 398         if (isp->otg.gadget) {
 399                 isp->otg.gadget->is_a_peripheral = 0;
 400                 gadget_suspend(isp);
 401         }
 402         isp->otg.state = OTG_STATE_B_IDLE;
 403         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 404         omap_writel(l, OTG_CTRL);
 405         isp->last_otg_ctrl = l;
 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                 omap_readl(OTG_CTRL), 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 = omap_readw(OTG_TEST) & 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),
 507                 omap_readl(OTG_CTRL));
 508 }
 509
 510 #else
 511
 512 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 513
 514 #endif
 515
 516 /* outputs from ISP1301_INTERRUPT_SOURCE */
 517 static void update_otg1(struct isp1301 *isp, u8 int_src)
 518 {
 519         u32     otg_ctrl;
 520         u8      int_id;
 521
 522         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 523         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 524         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 525
 526
 527         if (int_src & INTR_SESS_VLD)
 528                 otg_ctrl |= OTG_ASESSVLD;
 529         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 530                 a_idle(isp, "vfall");
 531                 otg_ctrl &= ~OTG_CTRL_BITS;
 532         }
 533         if (int_src & INTR_VBUS_VLD)
 534                 otg_ctrl |= OTG_VBUSVLD;
 535
 536         int_id = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 537
 538         if (int_id & INTR_ID_GND) {             /* default-A */
 539                 if (isp->otg.state == OTG_STATE_B_IDLE
 540                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 541                         a_idle(isp, "init");
 542                         return;
 543                 }
 544         } else {                                /* default-B */
 545                 otg_ctrl |= OTG_ID;
 546                 if (isp->otg.state == OTG_STATE_A_IDLE
 547                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 548                         b_idle(isp, "init");
 549                         return;
 550                 }
 551         }
 552         omap_writel(otg_ctrl, OTG_CTRL);
 553 }
 554
 555 /* outputs from ISP1301_OTG_STATUS */
 556 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 557 {
 558         u32     otg_ctrl;
 559
 560         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 561         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 562         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 563         if (otg_status & OTG_B_SESS_VLD)
 564                 otg_ctrl |= OTG_BSESSVLD;
 565         else if (otg_status & OTG_B_SESS_END)
 566                 otg_ctrl |= OTG_BSESSEND;
 567         omap_writel(otg_ctrl, OTG_CTRL);
 568 }
 569
 570 /* inputs going to ISP1301 */
 571 static void otg_update_isp(struct isp1301 *isp)
 572 {
 573         u32     otg_ctrl, otg_change;
 574         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 575
 576         otg_ctrl = omap_readl(OTG_CTRL);
 577         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 578         isp->last_otg_ctrl = otg_ctrl;
 579         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 580
 581         switch (isp->otg.state) {
 582         case OTG_STATE_B_IDLE:
 583         case OTG_STATE_B_PERIPHERAL:
 584         case OTG_STATE_B_SRP_INIT:
 585                 if (!(otg_ctrl & OTG_PULLUP)) {
 586                         // if (otg_ctrl & OTG_B_HNPEN) {
 587                         if (isp->otg.gadget->b_hnp_enable) {
 588                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 589                                 pr_debug("  --> b_wait_acon\n");
 590                         }
 591                         goto pulldown;
 592                 }
 593 pullup:
 594                 set |= OTG1_DP_PULLUP;
 595                 clr |= OTG1_DP_PULLDOWN;
 596                 break;
 597         case OTG_STATE_A_SUSPEND:
 598         case OTG_STATE_A_PERIPHERAL:
 599                 if (otg_ctrl & OTG_PULLUP)
 600                         goto pullup;
 601                 /* FALLTHROUGH */
 602         // case OTG_STATE_B_WAIT_ACON:
 603         default:
 604 pulldown:
 605                 set |= OTG1_DP_PULLDOWN;
 606                 clr |= OTG1_DP_PULLUP;
 607                 break;
 608         }
 609
 610 #       define toggle(OTG,ISP) do { \
 611                 if (otg_ctrl & OTG) set |= ISP; \
 612                 else clr |= ISP; \
 613                 } while (0)
 614
 615         if (!(isp->otg.host))
 616                 otg_ctrl &= ~OTG_DRV_VBUS;
 617
 618         switch (isp->otg.state) {
 619         case OTG_STATE_A_SUSPEND:
 620                 if (otg_ctrl & OTG_DRV_VBUS) {
 621                         set |= OTG1_VBUS_DRV;
 622                         break;
 623                 }
 624                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 625                 notresponding(isp);
 626
 627                 /* FALLTHROUGH */
 628         case OTG_STATE_A_VBUS_ERR:
 629                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 630                 pr_debug("  --> a_wait_vfall\n");
 631                 /* FALLTHROUGH */
 632         case OTG_STATE_A_WAIT_VFALL:
 633                 /* FIXME usbcore thinks port power is still on ... */
 634                 clr |= OTG1_VBUS_DRV;
 635                 break;
 636         case OTG_STATE_A_IDLE:
 637                 if (otg_ctrl & OTG_DRV_VBUS) {
 638                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 639                         pr_debug("  --> a_wait_vrise\n");
 640                 }
 641                 /* FALLTHROUGH */
 642         default:
 643                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 644         }
 645
 646         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 647         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 648
 649 #       undef toggle
 650
 651         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 652         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 653
 654         /* HNP switch to host or peripheral; and SRP */
 655         if (otg_change & OTG_PULLUP) {
 656                 u32 l;
 657
 658                 switch (isp->otg.state) {
 659                 case OTG_STATE_B_IDLE:
 660                         if (clr & OTG1_DP_PULLUP)
 661                                 break;
 662                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 663                         pr_debug("  --> b_peripheral\n");
 664                         break;
 665                 case OTG_STATE_A_SUSPEND:
 666                         if (clr & OTG1_DP_PULLUP)
 667                                 break;
 668                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 669                         pr_debug("  --> a_peripheral\n");
 670                         break;
 671                 default:
 672                         break;
 673                 }
 674                 l = omap_readl(OTG_CTRL);
 675                 l |= OTG_PULLUP;
 676                 omap_writel(l, OTG_CTRL);
 677         }
 678
 679         check_state(isp, __func__);
 680         dump_regs(isp, "otg->isp1301");
 681 }
 682
 683 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 684 {
 685         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 686         u32             otg_ctrl;
 687         int             ret = IRQ_NONE;
 688         struct isp1301  *isp = _isp;
 689
 690         /* update ISP1301 transciever from OTG controller */
 691         if (otg_irq & OPRT_CHG) {
 692                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 693                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 694                 ret = IRQ_HANDLED;
 695
 696         /* SRP to become b_peripheral failed */
 697         } else if (otg_irq & B_SRP_TMROUT) {
 698                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 699                 notresponding(isp);
 700
 701                 /* gadget drivers that care should monitor all kinds of
 702                  * remote wakeup (SRP, normal) using their own timer
 703                  * to give "check cable and A-device" messages.
 704                  */
 705                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 706                         b_idle(isp, "srp_timeout");
 707
 708                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 709                 ret = IRQ_HANDLED;
 710
 711         /* HNP to become b_host failed */
 712         } else if (otg_irq & B_HNP_FAIL) {
 713                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 714                                 state_name(isp), omap_readl(OTG_CTRL));
 715                 notresponding(isp);
 716
 717                 otg_ctrl = omap_readl(OTG_CTRL);
 718                 otg_ctrl |= OTG_BUSDROP;
 719                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 720                 omap_writel(otg_ctrl, OTG_CTRL);
 721
 722                 /* subset of b_peripheral()... */
 723                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 724                 pr_debug("  --> b_peripheral\n");
 725
 726                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 727                 ret = IRQ_HANDLED;
 728
 729         /* detect SRP from B-device ... */
 730         } else if (otg_irq & A_SRP_DETECT) {
 731                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 732                                 state_name(isp), omap_readl(OTG_CTRL));
 733
 734                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 735                 switch (isp->otg.state) {
 736                 case OTG_STATE_A_IDLE:
 737                         if (!isp->otg.host)
 738                                 break;
 739                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 740                         otg_ctrl = omap_readl(OTG_CTRL);
 741                         otg_ctrl |= OTG_A_BUSREQ;
 742                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 743                                         & ~OTG_XCEIV_INPUTS
 744                                         & OTG_CTRL_MASK;
 745                         omap_writel(otg_ctrl, OTG_CTRL);
 746                         break;
 747                 default:
 748                         break;
 749                 }
 750
 751                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 752                 ret = IRQ_HANDLED;
 753
 754         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 755          * we don't track them separately
 756          */
 757         } else if (otg_irq & A_REQ_TMROUT) {
 758                 otg_ctrl = omap_readl(OTG_CTRL);
 759                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 760                                 state_name(isp), otg_ctrl);
 761                 notresponding(isp);
 762
 763                 otg_ctrl |= OTG_BUSDROP;
 764                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 765                 omap_writel(otg_ctrl, OTG_CTRL);
 766                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 767
 768                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 769                 ret = IRQ_HANDLED;
 770
 771         /* A-supplied voltage fell too low; overcurrent */
 772         } else if (otg_irq & A_VBUS_ERR) {
 773                 otg_ctrl = omap_readl(OTG_CTRL);
 774                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 775                         state_name(isp), otg_irq, otg_ctrl);
 776
 777                 otg_ctrl |= OTG_BUSDROP;
 778                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 779                 omap_writel(otg_ctrl, OTG_CTRL);
 780                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 781
 782                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 783                 ret = IRQ_HANDLED;
 784
 785         /* switch driver; the transciever code activates it,
 786          * ungating the udc clock or resuming OHCI.
 787          */
 788         } else if (otg_irq & DRIVER_SWITCH) {
 789                 int     kick = 0;
 790
 791                 otg_ctrl = omap_readl(OTG_CTRL);
 792                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 793                                 state_name(isp),
 794                                 (otg_ctrl & OTG_DRIVER_SEL)
 795                                         ? "gadget" : "host",
 796                                 otg_ctrl);
 797                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 798
 799                 /* role is peripheral */
 800                 if (otg_ctrl & OTG_DRIVER_SEL) {
 801                         switch (isp->otg.state) {
 802                         case OTG_STATE_A_IDLE:
 803                                 b_idle(isp, __func__);
 804                                 break;
 805                         default:
 806                                 break;
 807                         }
 808                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 809
 810                 /* role is host */
 811                 } else {
 812                         if (!(otg_ctrl & OTG_ID)) {
 813                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 814                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 815                         }
 816
 817                         if (isp->otg.host) {
 818                                 switch (isp->otg.state) {
 819                                 case OTG_STATE_B_WAIT_ACON:
 820                                         isp->otg.state = OTG_STATE_B_HOST;
 821                                         pr_debug("  --> b_host\n");
 822                                         kick = 1;
 823                                         break;
 824                                 case OTG_STATE_A_WAIT_BCON:
 825                                         isp->otg.state = OTG_STATE_A_HOST;
 826                                         pr_debug("  --> a_host\n");
 827                                         break;
 828                                 case OTG_STATE_A_PERIPHERAL:
 829                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 830                                         pr_debug("  --> a_wait_bcon\n");
 831                                         break;
 832                                 default:
 833                                         break;
 834                                 }
 835                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 836                         }
 837                 }
 838
 839                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 840                 ret = IRQ_HANDLED;
 841
 842                 if (kick)
 843                         usb_bus_start_enum(isp->otg.host,
 844                                                 isp->otg.host->otg_port);
 845         }
 846
 847         check_state(isp, __func__);
 848         return ret;
 849 }
 850
 851 static struct platform_device *otg_dev;
 852
 853 static int otg_init(struct isp1301 *isp)
 854 {
 855         u32 l;
 856
 857         if (!otg_dev)
 858                 return -ENODEV;
 859
 860         dump_regs(isp, __func__);
 861         /* some of these values are board-specific... */
 862         l = omap_readl(OTG_SYSCON_2);
 863         l |= OTG_EN
 864                 /* for B-device: */
 865                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 866                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 867                 // | (3 << 24)          /* 2msec VBUS pulse */
 868                 /* for A-device: */
 869                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 870                 | SRP_DPW               /* detect 167+ns SRP pulses */
 871                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 872                 ;
 873         omap_writel(l, OTG_SYSCON_2);
 874
 875         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 876         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 877
 878         check_state(isp, __func__);
 879         pr_debug("otg: %s, %s %06x\n",
 880                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 881
 882         omap_writew(DRIVER_SWITCH | OPRT_CHG
 883                         | B_SRP_TMROUT | B_HNP_FAIL
 884                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 885
 886         l = omap_readl(OTG_SYSCON_2);
 887         l |= OTG_EN;
 888         omap_writel(l, OTG_SYSCON_2);
 889
 890         return 0;
 891 }
 892
 893 static int otg_probe(struct platform_device *dev)
 894 {
 895         // struct omap_usb_config *config = dev->platform_data;
 896
 897         otg_dev = dev;
 898         return 0;
 899 }
 900
 901 static int otg_remove(struct platform_device *dev)
 902 {
 903         otg_dev = 0;
 904         return 0;
 905 }
 906
 907 struct platform_driver omap_otg_driver = {
 908         .probe          = otg_probe,
 909         .remove         = otg_remove,
 910         .driver         = {
 911                 .owner  = THIS_MODULE,
 912                 .name   = "omap_otg",
 913         },
 914 };
 915
 916 static int otg_bind(struct isp1301 *isp)
 917 {
 918         int     status;
 919
 920         if (otg_dev)
 921                 return -EBUSY;
 922
 923         status = platform_driver_register(&omap_otg_driver);
 924         if (status < 0)
 925                 return status;
 926
 927         if (otg_dev)
 928                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 929                                 IRQF_DISABLED, DRIVER_NAME, isp);
 930         else
 931                 status = -ENODEV;
 932
 933         if (status < 0)
 934                 platform_driver_unregister(&omap_otg_driver);
 935         return status;
 936 }
 937
 938 static void otg_unbind(struct isp1301 *isp)
 939 {
 940         if (!otg_dev)
 941                 return;
 942         free_irq(otg_dev->resource[1].start, isp);
 943 }
 944
 945 #else
 946
 947 /* OTG controller isn't clocked */
 948
 949 #endif  /* CONFIG_USB_OTG */
 950
 951 /*-------------------------------------------------------------------------*/
 952
 953 static void b_peripheral(struct isp1301 *isp)
 954 {
 955         u32 l;
 956
 957         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 958         omap_writel(l, OTG_CTRL);
 959
 960         usb_gadget_vbus_connect(isp->otg.gadget);
 961
 962 #ifdef  CONFIG_USB_OTG
 963         enable_vbus_draw(isp, 8);
 964         otg_update_isp(isp);
 965 #else
 966         enable_vbus_draw(isp, 100);
 967         /* UDC driver just set OTG_BSESSVLD */
 968         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 969         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 970         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 971         pr_debug("  --> b_peripheral\n");
 972         dump_regs(isp, "2periph");
 973 #endif
 974 }
 975
 976 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 977 {
 978         u8                      isp_stat, isp_bstat;
 979         enum usb_otg_state      state = isp->otg.state;
 980
 981         if (stat & INTR_BDIS_ACON)
 982                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 983
 984         /* start certain state transitions right away */
 985         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 986         if (isp_stat & INTR_ID_GND) {
 987                 if (isp->otg.default_a) {
 988                         switch (state) {
 989                         case OTG_STATE_B_IDLE:
 990                                 a_idle(isp, "idle");
 991                                 /* FALLTHROUGH */
 992                         case OTG_STATE_A_IDLE:
 993                                 enable_vbus_source(isp);
 994                                 /* FALLTHROUGH */
 995                         case OTG_STATE_A_WAIT_VRISE:
 996                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 997                                  * the HC will transition to A_HOST (or
 998                                  * A_SUSPEND!) without our noticing except
 999                                  * when HNP is used.
1000                                  */
1001                                 if (isp_stat & INTR_VBUS_VLD)
1002                                         isp->otg.state = OTG_STATE_A_HOST;
1003                                 break;
1004                         case OTG_STATE_A_WAIT_VFALL:
1005                                 if (!(isp_stat & INTR_SESS_VLD))
1006                                         a_idle(isp, "vfell");
1007                                 break;
1008                         default:
1009                                 if (!(isp_stat & INTR_VBUS_VLD))
1010                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1011                                 break;
1012                         }
1013                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1014                 } else {
1015                         switch (state) {
1016                         case OTG_STATE_B_PERIPHERAL:
1017                         case OTG_STATE_B_HOST:
1018                         case OTG_STATE_B_WAIT_ACON:
1019                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1020                                 break;
1021                         default:
1022                                 break;
1023                         }
1024                         if (state != OTG_STATE_A_IDLE)
1025                                 a_idle(isp, "id");
1026                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1027                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1028                         isp_bstat = 0;
1029                 }
1030         } else {
1031                 u32 l;
1032
1033                 /* if user unplugged mini-A end of cable,
1034                  * don't bypass A_WAIT_VFALL.
1035                  */
1036                 if (isp->otg.default_a) {
1037                         switch (state) {
1038                         default:
1039                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1040                                 break;
1041                         case OTG_STATE_A_WAIT_VFALL:
1042                                 state = OTG_STATE_A_IDLE;
1043                                 /* khubd may take a while to notice and
1044                                  * handle this disconnect, so don't go
1045                                  * to B_IDLE quite yet.
1046                                  */
1047                                 break;
1048                         case OTG_STATE_A_IDLE:
1049                                 host_suspend(isp);
1050                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1051                                                 MC1_BDIS_ACON_EN);
1052                                 isp->otg.state = OTG_STATE_B_IDLE;
1053                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1054                                 l &= ~OTG_CTRL_BITS;
1055                                 omap_writel(l, OTG_CTRL);
1056                                 break;
1057                         case OTG_STATE_B_IDLE:
1058                                 break;
1059                         }
1060                 }
1061                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1062
1063                 switch (isp->otg.state) {
1064                 case OTG_STATE_B_PERIPHERAL:
1065                 case OTG_STATE_B_WAIT_ACON:
1066                 case OTG_STATE_B_HOST:
1067                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1068                                 break;
1069                         enable_vbus_draw(isp, 0);
1070 #ifndef CONFIG_USB_OTG
1071                         /* UDC driver will clear OTG_BSESSVLD */
1072                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1073                                                 OTG1_DP_PULLDOWN);
1074                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1075                                                 OTG1_DP_PULLUP);
1076                         dump_regs(isp, __func__);
1077 #endif
1078                         /* FALLTHROUGH */
1079                 case OTG_STATE_B_SRP_INIT:
1080                         b_idle(isp, __func__);
1081                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1082                         omap_writel(l, OTG_CTRL);
1083                         /* FALLTHROUGH */
1084                 case OTG_STATE_B_IDLE:
1085                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1086 #ifdef  CONFIG_USB_OTG
1087                                 update_otg1(isp, isp_stat);
1088                                 update_otg2(isp, isp_bstat);
1089 #endif
1090                                 b_peripheral(isp);
1091                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1092                                 isp_bstat |= OTG_B_SESS_END;
1093                         break;
1094                 case OTG_STATE_A_WAIT_VFALL:
1095                         break;
1096                 default:
1097                         pr_debug("otg: unsupported b-device %s\n",
1098                                 state_name(isp));
1099                         break;
1100                 }
1101         }
1102
1103         if (state != isp->otg.state)
1104                 pr_debug("  isp, %s -> %s\n",
1105                                 state_string(state), state_name(isp));
1106
1107 #ifdef  CONFIG_USB_OTG
1108         /* update the OTG controller state to match the isp1301; may
1109          * trigger OPRT_CHG irqs for changes going to the isp1301.
1110          */
1111         update_otg1(isp, stat); // pass the actual interrupt latch status
1112         update_otg2(isp, isp_bstat);
1113         check_state(isp, __func__);
1114 #endif
1115
1116         dump_regs(isp, "isp1301->otg");
1117 }
1118
1119 /*-------------------------------------------------------------------------*/
1120
1121 static u8 isp1301_clear_latch(struct isp1301 *isp)
1122 {
1123         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1124         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1125         return latch;
1126 }
1127
1128 static void
1129 isp1301_work(struct work_struct *work)
1130 {
1131         struct isp1301  *isp = container_of(work, struct isp1301, work);
1132         int             stop;
1133
1134         /* implicit lock:  we're the only task using this device */
1135         isp->working = 1;
1136         do {
1137                 stop = test_bit(WORK_STOP, &isp->todo);
1138
1139 #ifdef  CONFIG_USB_OTG
1140                 /* transfer state from otg engine to isp1301 */
1141                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1142                         otg_update_isp(isp);
1143                         put_device(&isp->client->dev);
1144                 }
1145 #endif
1146                 /* transfer state from isp1301 to otg engine */
1147                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1148                         u8              stat = isp1301_clear_latch(isp);
1149
1150                         isp_update_otg(isp, stat);
1151                         put_device(&isp->client->dev);
1152                 }
1153
1154                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1155                         u32     otg_ctrl;
1156
1157                         /*
1158                          * skip A_WAIT_VRISE; hc transitions invisibly
1159                          * skip A_WAIT_BCON; same.
1160                          */
1161                         switch (isp->otg.state) {
1162                         case OTG_STATE_A_WAIT_BCON:
1163                         case OTG_STATE_A_WAIT_VRISE:
1164                                 isp->otg.state = OTG_STATE_A_HOST;
1165                                 pr_debug("  --> a_host\n");
1166                                 otg_ctrl = omap_readl(OTG_CTRL);
1167                                 otg_ctrl |= OTG_A_BUSREQ;
1168                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1169                                                 & OTG_CTRL_MASK;
1170                                 omap_writel(otg_ctrl, OTG_CTRL);
1171                                 break;
1172                         case OTG_STATE_B_WAIT_ACON:
1173                                 isp->otg.state = OTG_STATE_B_HOST;
1174                                 pr_debug("  --> b_host (acon)\n");
1175                                 break;
1176                         case OTG_STATE_B_HOST:
1177                         case OTG_STATE_B_IDLE:
1178                         case OTG_STATE_A_IDLE:
1179                                 break;
1180                         default:
1181                                 pr_debug("  host resume in %s\n",
1182                                                 state_name(isp));
1183                         }
1184                         host_resume(isp);
1185                         // mdelay(10);
1186                         put_device(&isp->client->dev);
1187                 }
1188
1189                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1190 #ifdef  VERBOSE
1191                         dump_regs(isp, "timer");
1192                         if (!stop)
1193                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1194 #endif
1195                         put_device(&isp->client->dev);
1196                 }
1197
1198                 if (isp->todo)
1199                         dev_vdbg(&isp->client->dev,
1200                                 "work done, todo = 0x%lx\n",
1201                                 isp->todo);
1202                 if (stop) {
1203                         dev_dbg(&isp->client->dev, "stop\n");
1204                         break;
1205                 }
1206         } while (isp->todo);
1207         isp->working = 0;
1208 }
1209
1210 static irqreturn_t isp1301_irq(int irq, void *isp)
1211 {
1212         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1213         return IRQ_HANDLED;
1214 }
1215
1216 static void isp1301_timer(unsigned long _isp)
1217 {
1218         isp1301_defer_work((void *)_isp, WORK_TIMER);
1219 }
1220
1221 /*-------------------------------------------------------------------------*/
1222
1223 static void isp1301_release(struct device *dev)
1224 {
1225         struct i2c_client       *client;
1226         struct isp1301          *isp;
1227
1228         client = container_of(dev, struct i2c_client, dev);
1229         isp = i2c_get_clientdata(client);
1230
1231         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1232         if (isp->i2c_release)
1233                 isp->i2c_release(dev);
1234         kfree (isp);
1235 }
1236
1237 static struct isp1301 *the_transceiver;
1238
1239 static int __exit isp1301_remove(struct i2c_client *client)
1240 {
1241         struct isp1301  *isp = i2c_get_clientdata(client);
1242
1243         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1244         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1245
1246         if (client->irq > 0)
1247                 free_irq(client->irq, isp);
1248 #ifdef  CONFIG_USB_OTG
1249         otg_unbind(isp);
1250 #endif
1251         isp->timer.data = 0;
1252         set_bit(WORK_STOP, &isp->todo);
1253         del_timer_sync(&isp->timer);
1254         flush_scheduled_work();
1255
1256         put_device(&client->dev);
1257         the_transceiver = 0;
1258
1259         return 0;
1260 }
1261
1262 /*-------------------------------------------------------------------------*/
1263
1264 /* NOTE:  three modes are possible here, only one of which
1265  * will be standards-conformant on any given system:
1266  *
1267  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1268  *  - HOST mode, for when there's one or more A (host) connectors
1269  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1270  *
1271  * As a rule, you won't have an isp1301 chip unless it's there to
1272  * support the OTG mode.  Other modes help testing USB controllers
1273  * in isolation from (full) OTG support, or maybe so later board
1274  * revisions can help to support those feature.
1275  */
1276
1277 #ifdef  CONFIG_USB_OTG
1278
1279 static int isp1301_otg_enable(struct isp1301 *isp)
1280 {
1281         power_up(isp);
1282         otg_init(isp);
1283
1284         /* NOTE:  since we don't change this, this provides
1285          * a few more interrupts than are strictly needed.
1286          */
1287         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1288                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1289         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1290                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1291
1292         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1293
1294         return 0;
1295 }
1296
1297 #endif
1298
1299 /* add or disable the host device+driver */
1300 static int
1301 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1302 {
1303         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1304
1305         if (!otg || isp != the_transceiver)
1306                 return -ENODEV;
1307
1308         if (!host) {
1309                 omap_writew(0, OTG_IRQ_EN);
1310                 power_down(isp);
1311                 isp->otg.host = 0;
1312                 return 0;
1313         }
1314
1315 #ifdef  CONFIG_USB_OTG
1316         isp->otg.host = host;
1317         dev_dbg(&isp->client->dev, "registered host\n");
1318         host_suspend(isp);
1319         if (isp->otg.gadget)
1320                 return isp1301_otg_enable(isp);
1321         return 0;
1322
1323 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1324         // FIXME update its refcount
1325         isp->otg.host = host;
1326
1327         power_up(isp);
1328
1329         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1330         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1331                 INTR_ID_GND);
1332         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1333                 INTR_ID_GND);
1334
1335         /* If this has a Mini-AB connector, this mode is highly
1336          * nonstandard ... but can be handy for testing, especially with
1337          * the Mini-A end of an OTG cable.  (Or something nonstandard
1338          * like MiniB-to-StandardB, maybe built with a gender mender.)
1339          */
1340         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1341
1342         dump_regs(isp, __func__);
1343
1344         return 0;
1345
1346 #else
1347         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1348         return -EINVAL;
1349 #endif
1350
1351 }
1352
1353 static int
1354 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1355 {
1356         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1357         u32 l;
1358
1359         if (!otg || isp != the_transceiver)
1360                 return -ENODEV;
1361
1362         if (!gadget) {
1363                 omap_writew(0, OTG_IRQ_EN);
1364                 if (!isp->otg.default_a)
1365                         enable_vbus_draw(isp, 0);
1366                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1367                 isp->otg.gadget = 0;
1368                 power_down(isp);
1369                 return 0;
1370         }
1371
1372 #ifdef  CONFIG_USB_OTG
1373         isp->otg.gadget = gadget;
1374         dev_dbg(&isp->client->dev, "registered gadget\n");
1375         /* gadget driver may be suspended until vbus_connect () */
1376         if (isp->otg.host)
1377                 return isp1301_otg_enable(isp);
1378         return 0;
1379
1380 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1381         isp->otg.gadget = gadget;
1382         // FIXME update its refcount
1383
1384         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1385         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1386         l |= OTG_ID;
1387         omap_writel(l, OTG_CTRL);
1388
1389         power_up(isp);
1390         isp->otg.state = OTG_STATE_B_IDLE;
1391
1392 // XXX h4 too?
1393         if (machine_is_omap_h2() || machine_is_omap_h3())
1394                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1395
1396         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1397                 INTR_SESS_VLD | INTR_VBUS_VLD);
1398         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1399                 INTR_VBUS_VLD | INTR_SESS_VLD);
1400         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1401         dump_regs(isp, __func__);
1402
1403         /* If this has a Mini-AB connector, this mode is highly
1404          * nonstandard ... but can be handy for testing, so long
1405          * as you don't plug a Mini-A cable into the jack.
1406          */
1407         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1408                 b_peripheral(isp);
1409
1410         return 0;
1411
1412 #else
1413         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1414         return -EINVAL;
1415 #endif
1416 }
1417
1418
1419 /*-------------------------------------------------------------------------*/
1420
1421 static int
1422 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1423 {
1424         if (!the_transceiver)
1425                 return -ENODEV;
1426         if (dev->state == OTG_STATE_B_PERIPHERAL)
1427                 enable_vbus_draw(the_transceiver, mA);
1428         return 0;
1429 }
1430
1431 static int
1432 isp1301_start_srp(struct otg_transceiver *dev)
1433 {
1434         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1435         u32             otg_ctrl;
1436
1437         if (!dev || isp != the_transceiver
1438                         || isp->otg.state != OTG_STATE_B_IDLE)
1439                 return -ENODEV;
1440
1441         otg_ctrl = omap_readl(OTG_CTRL);
1442         if (!(otg_ctrl & OTG_BSESSEND))
1443                 return -EINVAL;
1444
1445         otg_ctrl |= OTG_B_BUSREQ;
1446         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1447         omap_writel(otg_ctrl, OTG_CTRL);
1448         isp->otg.state = OTG_STATE_B_SRP_INIT;
1449
1450         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1451                         omap_readl(OTG_CTRL));
1452 #ifdef  CONFIG_USB_OTG
1453         check_state(isp, __func__);
1454 #endif
1455         return 0;
1456 }
1457
1458 static int
1459 isp1301_start_hnp(struct otg_transceiver *dev)
1460 {
1461 #ifdef  CONFIG_USB_OTG
1462         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1463         u32 l;
1464
1465         if (!dev || isp != the_transceiver)
1466                 return -ENODEV;
1467         if (isp->otg.default_a && (isp->otg.host == NULL
1468                         || !isp->otg.host->b_hnp_enable))
1469                 return -ENOTCONN;
1470         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1471                         || !isp->otg.gadget->b_hnp_enable))
1472                 return -ENOTCONN;
1473
1474         /* We want hardware to manage most HNP protocol timings.
1475          * So do this part as early as possible...
1476          */
1477         switch (isp->otg.state) {
1478         case OTG_STATE_B_PERIPHERAL:
1479                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
1480                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
1481                 break;
1482         case OTG_STATE_B_HOST:
1483                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1484                 /* caller will suspend next */
1485                 break;
1486         case OTG_STATE_A_HOST:
1487 #if 0
1488                 /* autoconnect mode avoids irq latency bugs */
1489                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1490                                 MC1_BDIS_ACON_EN);
1491 #endif
1492                 /* caller must suspend then clear A_BUSREQ */
1493                 usb_gadget_vbus_connect(isp->otg.gadget);
1494                 l = omap_readl(OTG_CTRL);
1495                 l |= OTG_A_SETB_HNPEN;
1496                 omap_writel(l, OTG_CTRL);
1497
1498                 break;
1499         case OTG_STATE_A_PERIPHERAL:
1500                 /* initiated by B-Host suspend */
1501                 break;
1502         default:
1503                 return -EILSEQ;
1504         }
1505         pr_debug("otg: HNP %s, %06x ...\n",
1506                 state_name(isp), omap_readl(OTG_CTRL));
1507         check_state(isp, __func__);
1508         return 0;
1509 #else
1510         /* srp-only */
1511         return -EINVAL;
1512 #endif
1513 }
1514
1515 /*-------------------------------------------------------------------------*/
1516
1517 /* no error returns, they'd just make bus scanning stop */
1518 static int __init isp1301_probe(struct i2c_client *client)
1519 {
1520         int                     status;
1521         struct isp1301          *isp;
1522
1523         if (the_transceiver)
1524                 return 0;
1525
1526         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1527         if (!isp)
1528                 return 0;
1529
1530         INIT_WORK(&isp->work, isp1301_work);
1531         init_timer(&isp->timer);
1532         isp->timer.function = isp1301_timer;
1533         isp->timer.data = (unsigned long) isp;
1534         isp->client = client;
1535
1536         /* if this is a true probe, verify the chip ... */
1537         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1538         if (status != I2C_VENDOR_ID_PHILIPS) {
1539                 dev_dbg(&client->dev, "not philips id: %d\n",
1540                                 status);
1541                 goto fail1;
1542         }
1543         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1544         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1545                 dev_dbg(&client->dev, "not isp1301, %d\n",
1546                                 status);
1547                 goto fail1;
1548         }
1549
1550         if (status < 0) {
1551                 dev_dbg(&client->dev, "can't attach %s to device, err %d\n",
1552                                 DRIVER_NAME, status);
1553 fail1:
1554                 kfree(isp);
1555                 return 0;
1556         }
1557         isp->i2c_release = client->dev.release;
1558         client->dev.release = isp1301_release;
1559
1560         /* initial development used chiprev 2.00 */
1561         status = i2c_smbus_read_word_data(client, ISP1301_BCD_DEVICE);
1562         dev_info(&client->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1563                 status >> 8, status & 0xff);
1564
1565         /* make like power-on reset */
1566         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1567
1568         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1569         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1570
1571         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1572                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1573         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1574                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1575
1576         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1577         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1578         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1579
1580 #ifdef  CONFIG_USB_OTG
1581         status = otg_bind(isp);
1582         if (status < 0) {
1583                 dev_dbg(&client->dev, "can't bind OTG\n");
1584                 goto fail2;
1585         }
1586 #endif
1587
1588         status = request_irq(client->irq, isp1301_irq,
1589                         IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
1590                         DRIVER_NAME, isp);
1591         if (status < 0) {
1592                 dev_dbg(&client->dev, "can't get IRQ %d, err %d\n",
1593                                 client->irq, status);
1594 #ifdef  CONFIG_USB_OTG
1595 fail2:
1596 #endif
1597                 i2c_detach_client(client);
1598                 goto fail1;
1599         }
1600
1601         isp->otg.dev = &client->dev;
1602         isp->otg.label = DRIVER_NAME;
1603
1604         isp->otg.set_host = isp1301_set_host,
1605         isp->otg.set_peripheral = isp1301_set_peripheral,
1606         isp->otg.set_power = isp1301_set_power,
1607         isp->otg.start_srp = isp1301_start_srp,
1608         isp->otg.start_hnp = isp1301_start_hnp,
1609
1610         enable_vbus_draw(isp, 0);
1611         power_down(isp);
1612         the_transceiver = isp;
1613
1614 #ifdef  CONFIG_USB_OTG
1615         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1616         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1617 #endif
1618         dump_regs(isp, __func__);
1619
1620 #ifdef  VERBOSE
1621         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1622         dev_dbg(&client->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1623 #endif
1624
1625         status = otg_set_transceiver(&isp->otg);
1626         if (status < 0)
1627                 dev_err(&client->dev, "can't register transceiver, %d\n",
1628                         status);
1629
1630         return 0;
1631 }
1632
1633 static struct i2c_driver isp1301_driver = {
1634         .driver = {
1635                 .name   = "isp1301_omap",
1636         },
1637         .probe  = isp1301_probe,
1638         .remove = __exit_p(isp1301_remove),
1639 };
1640
1641 /*-------------------------------------------------------------------------*/
1642
1643 static int __init isp_init(void)
1644 {
1645         return i2c_add_driver(&isp1301_driver);
1646 }
1647 module_init(isp_init);
1648
1649 static void __exit isp_exit(void)
1650 {
1651         if (the_transceiver)
1652                 otg_set_transceiver(0);
1653         i2c_del_driver(&isp1301_driver);
1654 }
1655 module_exit(isp_exit);
1656