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/interrupt.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/usb/ch9.h>
  31 #include <linux/usb/gadget.h>
  32 #include <linux/usb.h>
  33 #include <linux/usb/otg.h>
  34 #include <linux/i2c.h>
  35 #include <linux/workqueue.h>
  36 #include <asm/arch/usb.h>
  37
  38
  39 #ifndef DEBUG
  40 #undef  VERBOSE
  41 #endif
  42
  43 #define DRIVER_VERSION  "24 August 2004"
  44 #define DRIVER_NAME     (isp1301_driver.driver.name)
  45
  46 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  47 MODULE_LICENSE("GPL");
  48
  49 struct isp1301 {
  50         struct otg_transceiver  otg;
  51         struct i2c_client       *client;
  52         void                    (*i2c_release)(struct device *dev);
  53
  54         u32                     last_otg_ctrl;
  55         unsigned                working:1;
  56
  57         struct timer_list       timer;
  58
  59         /* use keventd context to change the state for us */
  60         struct work_struct      work;
  61
  62         unsigned long           todo;
  63 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  64 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  65 #               define WORK_HOST_RESUME 4       /* resume host */
  66 #               define WORK_TIMER       6       /* timer fired */
  67 #               define WORK_STOP        7       /* don't resubmit */
  68 };
  69
  70
  71 /* bits in OTG_CTRL_REG */
  72
  73 #define OTG_XCEIV_OUTPUTS \
  74         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  75 #define OTG_XCEIV_INPUTS \
  76         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  77 #define OTG_CTRL_BITS \
  78         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  79         /* and OTG_PULLUP is sometimes written */
  80
  81 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  82         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  83         OTG_CTRL_BITS)
  84
  85
  86 /*-------------------------------------------------------------------------*/
  87
  88 #if     defined(CONFIG_MACH_OMAP_H2) || \
  89         defined(CONFIG_MACH_OMAP_H3)
  90
  91 /* board-specific PM hooks */
  92
  93
  94 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
  95
  96 #include <asm/arch/tps65010.h>
  97
  98 #else
  99
 100 static inline int tps65010_set_vbus_draw(unsigned mA)
 101 {
 102         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 103         return 0;
 104 }
 105
 106 #endif
 107
 108 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 109 {
 110         int status = tps65010_set_vbus_draw(mA);
 111         if (status < 0)
 112                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 113 }
 114
 115 static void enable_vbus_source(struct isp1301 *isp)
 116 {
 117         /* this board won't supply more than 8mA vbus power.
 118          * some boards can switch a 100ma "unit load" (or more).
 119          */
 120 }
 121
 122
 123 #else
 124
 125 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 126 {
 127         pr_debug("%s UNIMPL\n", __FUNCTION__);
 128 }
 129
 130 static void enable_vbus_source(struct isp1301 *isp)
 131 {
 132         pr_debug("%s UNIMPL\n", __FUNCTION__);
 133 }
 134
 135 #endif
 136
 137 /*-------------------------------------------------------------------------*/
 138
 139 /* products will deliver OTG messages with LEDs, GUI, etc */
 140 static inline void notresponding(struct isp1301 *isp)
 141 {
 142         printk(KERN_NOTICE "OTG device not responding.\n");
 143 }
 144
 145 /*-------------------------------------------------------------------------*/
 146
 147 /* only two addresses possible */
 148 static struct i2c_driver isp1301_driver;
 149
 150 /* smbus apis are used for portability */
 151
 152 static inline u8
 153 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 154 {
 155         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 156 }
 157
 158 static inline int
 159 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 160 {
 161         return i2c_smbus_read_word_data(isp->client, reg);
 162 }
 163
 164 static inline int
 165 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 166 {
 167         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 168 }
 169
 170 static inline int
 171 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 172 {
 173         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 174 }
 175
 176 /*-------------------------------------------------------------------------*/
 177
 178 /* identification */
 179 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 180 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 181 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 182
 183 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 184 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 185
 186 /* operational registers */
 187 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 188 #       define  MC1_SPEED_REG           (1 << 0)
 189 #       define  MC1_SUSPEND_REG         (1 << 1)
 190 #       define  MC1_DAT_SE0             (1 << 2)
 191 #       define  MC1_TRANSPARENT         (1 << 3)
 192 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 193 #       define  MC1_OE_INT_EN           (1 << 5)
 194 #       define  MC1_UART_EN             (1 << 6)
 195 #       define  MC1_MASK                0x7f
 196 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 197 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 198 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 199 #       define  MC2_BI_DI               (1 << 2)
 200 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 201 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 202 #       define  MC2_AUDIO_EN            (1 << 5)
 203 #       define  MC2_PSW_EN              (1 << 6)
 204 #       define  MC2_EN2V7               (1 << 7)
 205 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 206 #       define  OTG1_DP_PULLUP          (1 << 0)
 207 #       define  OTG1_DM_PULLUP          (1 << 1)
 208 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 209 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 210 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 211 #       define  OTG1_VBUS_DRV           (1 << 5)
 212 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 213 #       define  OTG1_VBUS_CHRG          (1 << 7)
 214 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 215 #       define  OTG_B_SESS_END          (1 << 6)
 216 #       define  OTG_B_SESS_VLD          (1 << 7)
 217
 218 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 219 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 220
 221 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 222 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 223
 224 /* same bitfields in all interrupt registers */
 225 #       define  INTR_VBUS_VLD           (1 << 0)
 226 #       define  INTR_SESS_VLD           (1 << 1)
 227 #       define  INTR_DP_HI              (1 << 2)
 228 #       define  INTR_ID_GND             (1 << 3)
 229 #       define  INTR_DM_HI              (1 << 4)
 230 #       define  INTR_ID_FLOAT           (1 << 5)
 231 #       define  INTR_BDIS_ACON          (1 << 6)
 232 #       define  INTR_CR_INT             (1 << 7)
 233
 234 /*-------------------------------------------------------------------------*/
 235
 236 static const char *state_string(enum usb_otg_state state)
 237 {
 238         switch (state) {
 239         case OTG_STATE_A_IDLE:          return "a_idle";
 240         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 241         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 242         case OTG_STATE_A_HOST:          return "a_host";
 243         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 244         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 245         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 246         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 247         case OTG_STATE_B_IDLE:          return "b_idle";
 248         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 249         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 250         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 251         case OTG_STATE_B_HOST:          return "b_host";
 252         default:                        return "UNDEFINED";
 253         }
 254 }
 255
 256 static inline const char *state_name(struct isp1301 *isp)
 257 {
 258         return state_string(isp->otg.state);
 259 }
 260
 261 #ifdef  VERBOSE
 262 #define dev_vdbg                        dev_dbg
 263 #else
 264 #define dev_vdbg(dev, fmt, arg...)      do{}while(0)
 265 #endif
 266
 267 /*-------------------------------------------------------------------------*/
 268
 269 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 270  * not everything is guarded by board-specific checks, or even using
 271  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 272  *
 273  * ALSO:  this currently doesn't use ISP1301 low-power modes
 274  * while OTG is running.
 275  */
 276
 277 static void power_down(struct isp1301 *isp)
 278 {
 279         isp->otg.state = OTG_STATE_UNDEFINED;
 280
 281         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 282         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
 283
 284         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 285         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 286 }
 287
 288 static void power_up(struct isp1301 *isp)
 289 {
 290         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 291         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
 292
 293         /* do this only when cpu is driving transceiver,
 294          * so host won't see a low speed device...
 295          */
 296         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 297 }
 298
 299 #define NO_HOST_SUSPEND
 300
 301 static int host_suspend(struct isp1301 *isp)
 302 {
 303 #ifdef  NO_HOST_SUSPEND
 304         return 0;
 305 #else
 306         struct device   *dev;
 307
 308         if (!isp->otg.host)
 309                 return -ENODEV;
 310
 311         /* Currently ASSUMES only the OTG port matters;
 312          * other ports could be active...
 313          */
 314         dev = isp->otg.host->controller;
 315         return dev->driver->suspend(dev, 3, 0);
 316 #endif
 317 }
 318
 319 static int host_resume(struct isp1301 *isp)
 320 {
 321 #ifdef  NO_HOST_SUSPEND
 322         return 0;
 323 #else
 324         struct device   *dev;
 325
 326         if (!isp->otg.host)
 327                 return -ENODEV;
 328
 329         dev = isp->otg.host->controller;
 330         return dev->driver->resume(dev, 0);
 331 #endif
 332 }
 333
 334 static int gadget_suspend(struct isp1301 *isp)
 335 {
 336         isp->otg.gadget->b_hnp_enable = 0;
 337         isp->otg.gadget->a_hnp_support = 0;
 338         isp->otg.gadget->a_alt_hnp_support = 0;
 339         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 340 }
 341
 342 /*-------------------------------------------------------------------------*/
 343
 344 #define TIMER_MINUTES   10
 345 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 346
 347 /* Almost all our I2C messaging comes from a work queue's task context.
 348  * NOTE: guaranteeing certain response times might mean we shouldn't
 349  * share keventd's work queue; a realtime task might be safest.
 350  */
 351 void
 352 isp1301_defer_work(struct isp1301 *isp, int work)
 353 {
 354         int status;
 355
 356         if (isp && !test_and_set_bit(work, &isp->todo)) {
 357                 (void) get_device(&isp->client->dev);
 358                 status = schedule_work(&isp->work);
 359                 if (!status && !isp->working)
 360                         dev_vdbg(&isp->client->dev,
 361                                 "work item %d may be lost\n", work);
 362         }
 363 }
 364
 365 /* called from irq handlers */
 366 static void a_idle(struct isp1301 *isp, const char *tag)
 367 {
 368         if (isp->otg.state == OTG_STATE_A_IDLE)
 369                 return;
 370
 371         isp->otg.default_a = 1;
 372         if (isp->otg.host) {
 373                 isp->otg.host->is_b_host = 0;
 374                 host_suspend(isp);
 375         }
 376         if (isp->otg.gadget) {
 377                 isp->otg.gadget->is_a_peripheral = 1;
 378                 gadget_suspend(isp);
 379         }
 380         isp->otg.state = OTG_STATE_A_IDLE;
 381         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 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         if (isp->otg.state == OTG_STATE_B_IDLE)
 389                 return;
 390
 391         isp->otg.default_a = 0;
 392         if (isp->otg.host) {
 393                 isp->otg.host->is_b_host = 1;
 394                 host_suspend(isp);
 395         }
 396         if (isp->otg.gadget) {
 397                 isp->otg.gadget->is_a_peripheral = 0;
 398                 gadget_suspend(isp);
 399         }
 400         isp->otg.state = OTG_STATE_B_IDLE;
 401         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 402         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 403 }
 404
 405 static void
 406 dump_regs(struct isp1301 *isp, const char *label)
 407 {
 408 #ifdef  DEBUG
 409         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 410         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 411         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 412
 413         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 414                 OTG_CTRL_REG, label, state_name(isp),
 415                 ctrl, status, src);
 416         /* mode control and irq enables don't change much */
 417 #endif
 418 }
 419
 420 /*-------------------------------------------------------------------------*/
 421
 422 #ifdef  CONFIG_USB_OTG
 423
 424 /*
 425  * The OMAP OTG controller handles most of the OTG state transitions.
 426  *
 427  * We translate isp1301 outputs (mostly voltage comparator status) into
 428  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 429  * flags into isp1301 inputs ... and infer state transitions.
 430  */
 431
 432 #ifdef  VERBOSE
 433
 434 static void check_state(struct isp1301 *isp, const char *tag)
 435 {
 436         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 437         u8                      fsm = OTG_TEST_REG & 0x0ff;
 438         unsigned                extra = 0;
 439
 440         switch (fsm) {
 441
 442         /* default-b */
 443         case 0x0:
 444                 state = OTG_STATE_B_IDLE;
 445                 break;
 446         case 0x3:
 447         case 0x7:
 448                 extra = 1;
 449         case 0x1:
 450                 state = OTG_STATE_B_PERIPHERAL;
 451                 break;
 452         case 0x11:
 453                 state = OTG_STATE_B_SRP_INIT;
 454                 break;
 455
 456         /* extra dual-role default-b states */
 457         case 0x12:
 458         case 0x13:
 459         case 0x16:
 460                 extra = 1;
 461         case 0x17:
 462                 state = OTG_STATE_B_WAIT_ACON;
 463                 break;
 464         case 0x34:
 465                 state = OTG_STATE_B_HOST;
 466                 break;
 467
 468         /* default-a */
 469         case 0x36:
 470                 state = OTG_STATE_A_IDLE;
 471                 break;
 472         case 0x3c:
 473                 state = OTG_STATE_A_WAIT_VFALL;
 474                 break;
 475         case 0x7d:
 476                 state = OTG_STATE_A_VBUS_ERR;
 477                 break;
 478         case 0x9e:
 479         case 0x9f:
 480                 extra = 1;
 481         case 0x89:
 482                 state = OTG_STATE_A_PERIPHERAL;
 483                 break;
 484         case 0xb7:
 485                 state = OTG_STATE_A_WAIT_VRISE;
 486                 break;
 487         case 0xb8:
 488                 state = OTG_STATE_A_WAIT_BCON;
 489                 break;
 490         case 0xb9:
 491                 state = OTG_STATE_A_HOST;
 492                 break;
 493         case 0xba:
 494                 state = OTG_STATE_A_SUSPEND;
 495                 break;
 496         default:
 497                 break;
 498         }
 499         if (isp->otg.state == state && !extra)
 500                 return;
 501         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 502                 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
 503 }
 504
 505 #else
 506
 507 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 508
 509 #endif
 510
 511 /* outputs from ISP1301_INTERRUPT_SOURCE */
 512 static void update_otg1(struct isp1301 *isp, u8 int_src)
 513 {
 514         u32     otg_ctrl;
 515         u8      int_id;
 516
 517         otg_ctrl = OTG_CTRL_REG
 518                         & OTG_CTRL_MASK
 519                         & ~OTG_XCEIV_INPUTS
 520                         & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 521         if (int_src & INTR_SESS_VLD)
 522                 otg_ctrl |= OTG_ASESSVLD;
 523         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 524                 a_idle(isp, "vfall");
 525                 otg_ctrl &= ~OTG_CTRL_BITS;
 526         }
 527         if (int_src & INTR_VBUS_VLD)
 528                 otg_ctrl |= OTG_VBUSVLD;
 529
 530         int_id = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 531
 532         if (int_id & INTR_ID_GND) {             /* default-A */
 533                 if (isp->otg.state == OTG_STATE_B_IDLE
 534                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 535                         a_idle(isp, "init");
 536                         return;
 537                 }
 538         } else {                                /* default-B */
 539                 otg_ctrl |= OTG_ID;
 540                 if (isp->otg.state == OTG_STATE_A_IDLE
 541                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 542                         b_idle(isp, "init");
 543                         return;
 544                 }
 545         }
 546         OTG_CTRL_REG = otg_ctrl;
 547 }
 548
 549 /* outputs from ISP1301_OTG_STATUS */
 550 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 551 {
 552         u32     otg_ctrl;
 553
 554         otg_ctrl = OTG_CTRL_REG
 555                         & OTG_CTRL_MASK
 556                         & ~OTG_XCEIV_INPUTS
 557                         & ~(OTG_BSESSVLD|OTG_BSESSEND);
 558         if (otg_status & OTG_B_SESS_VLD)
 559                 otg_ctrl |= OTG_BSESSVLD;
 560         else if (otg_status & OTG_B_SESS_END)
 561                 otg_ctrl |= OTG_BSESSEND;
 562         OTG_CTRL_REG = otg_ctrl;
 563 }
 564
 565 /* inputs going to ISP1301 */
 566 static void otg_update_isp(struct isp1301 *isp)
 567 {
 568         u32     otg_ctrl, otg_change;
 569         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 570
 571         otg_ctrl = OTG_CTRL_REG;
 572         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 573         isp->last_otg_ctrl = otg_ctrl;
 574         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 575
 576         switch (isp->otg.state) {
 577         case OTG_STATE_B_IDLE:
 578         case OTG_STATE_B_PERIPHERAL:
 579         case OTG_STATE_B_SRP_INIT:
 580                 if (!(otg_ctrl & OTG_PULLUP)) {
 581                         // if (otg_ctrl & OTG_B_HNPEN) {
 582                         if (isp->otg.gadget->b_hnp_enable) {
 583                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 584                                 pr_debug("  --> b_wait_acon\n");
 585                         }
 586                         goto pulldown;
 587                 }
 588 pullup:
 589                 set |= OTG1_DP_PULLUP;
 590                 clr |= OTG1_DP_PULLDOWN;
 591                 break;
 592         case OTG_STATE_A_SUSPEND:
 593         case OTG_STATE_A_PERIPHERAL:
 594                 if (otg_ctrl & OTG_PULLUP)
 595                         goto pullup;
 596                 /* FALLTHROUGH */
 597         // case OTG_STATE_B_WAIT_ACON:
 598         default:
 599 pulldown:
 600                 set |= OTG1_DP_PULLDOWN;
 601                 clr |= OTG1_DP_PULLUP;
 602                 break;
 603         }
 604
 605 #       define toggle(OTG,ISP) do { \
 606                 if (otg_ctrl & OTG) set |= ISP; \
 607                 else clr |= ISP; \
 608                 } while (0)
 609
 610         if (!(isp->otg.host))
 611                 otg_ctrl &= ~OTG_DRV_VBUS;
 612
 613         switch (isp->otg.state) {
 614         case OTG_STATE_A_SUSPEND:
 615                 if (otg_ctrl & OTG_DRV_VBUS) {
 616                         set |= OTG1_VBUS_DRV;
 617                         break;
 618                 }
 619                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 620                 notresponding(isp);
 621
 622                 /* FALLTHROUGH */
 623         case OTG_STATE_A_VBUS_ERR:
 624                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 625                 pr_debug("  --> a_wait_vfall\n");
 626                 /* FALLTHROUGH */
 627         case OTG_STATE_A_WAIT_VFALL:
 628                 /* FIXME usbcore thinks port power is still on ... */
 629                 clr |= OTG1_VBUS_DRV;
 630                 break;
 631         case OTG_STATE_A_IDLE:
 632                 if (otg_ctrl & OTG_DRV_VBUS) {
 633                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 634                         pr_debug("  --> a_wait_vrise\n");
 635                 }
 636                 /* FALLTHROUGH */
 637         default:
 638                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 639         }
 640
 641         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 642         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 643
 644 #       undef toggle
 645
 646         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 647         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 648
 649         /* HNP switch to host or peripheral; and SRP */
 650         if (otg_change & OTG_PULLUP) {
 651                 switch (isp->otg.state) {
 652                 case OTG_STATE_B_IDLE:
 653                         if (clr & OTG1_DP_PULLUP)
 654                                 break;
 655                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 656                         pr_debug("  --> b_peripheral\n");
 657                         break;
 658                 case OTG_STATE_A_SUSPEND:
 659                         if (clr & OTG1_DP_PULLUP)
 660                                 break;
 661                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 662                         pr_debug("  --> a_peripheral\n");
 663                         break;
 664                 default:
 665                         break;
 666                 }
 667                 OTG_CTRL_REG |= OTG_PULLUP;
 668         }
 669
 670         check_state(isp, __FUNCTION__);
 671         dump_regs(isp, "otg->isp1301");
 672 }
 673
 674 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 675 {
 676         u16             otg_irq = OTG_IRQ_SRC_REG;
 677         u32             otg_ctrl;
 678         int             ret = IRQ_NONE;
 679         struct isp1301  *isp = _isp;
 680
 681         /* update ISP1301 transciever from OTG controller */
 682         if (otg_irq & OPRT_CHG) {
 683                 OTG_IRQ_SRC_REG = OPRT_CHG;
 684                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 685                 ret = IRQ_HANDLED;
 686
 687         /* SRP to become b_peripheral failed */
 688         } else if (otg_irq & B_SRP_TMROUT) {
 689                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
 690                 notresponding(isp);
 691
 692                 /* gadget drivers that care should monitor all kinds of
 693                  * remote wakeup (SRP, normal) using their own timer
 694                  * to give "check cable and A-device" messages.
 695                  */
 696                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 697                         b_idle(isp, "srp_timeout");
 698
 699                 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
 700                 ret = IRQ_HANDLED;
 701
 702         /* HNP to become b_host failed */
 703         } else if (otg_irq & B_HNP_FAIL) {
 704                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 705                                 state_name(isp), OTG_CTRL_REG);
 706                 notresponding(isp);
 707
 708                 otg_ctrl = OTG_CTRL_REG;
 709                 otg_ctrl |= OTG_BUSDROP;
 710                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 711                 OTG_CTRL_REG = otg_ctrl;
 712
 713                 /* subset of b_peripheral()... */
 714                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 715                 pr_debug("  --> b_peripheral\n");
 716
 717                 OTG_IRQ_SRC_REG = B_HNP_FAIL;
 718                 ret = IRQ_HANDLED;
 719
 720         /* detect SRP from B-device ... */
 721         } else if (otg_irq & A_SRP_DETECT) {
 722                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 723                                 state_name(isp), OTG_CTRL_REG);
 724
 725                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 726                 switch (isp->otg.state) {
 727                 case OTG_STATE_A_IDLE:
 728                         if (!isp->otg.host)
 729                                 break;
 730                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 731                         otg_ctrl = OTG_CTRL_REG;
 732                         otg_ctrl |= OTG_A_BUSREQ;
 733                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 734                                         & ~OTG_XCEIV_INPUTS
 735                                         & OTG_CTRL_MASK;
 736                         OTG_CTRL_REG = otg_ctrl;
 737                         break;
 738                 default:
 739                         break;
 740                 }
 741
 742                 OTG_IRQ_SRC_REG = A_SRP_DETECT;
 743                 ret = IRQ_HANDLED;
 744
 745         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 746          * we don't track them separately
 747          */
 748         } else if (otg_irq & A_REQ_TMROUT) {
 749                 otg_ctrl = OTG_CTRL_REG;
 750                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 751                                 state_name(isp), otg_ctrl);
 752                 notresponding(isp);
 753
 754                 otg_ctrl |= OTG_BUSDROP;
 755                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 756                 OTG_CTRL_REG = otg_ctrl;
 757                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 758
 759                 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
 760                 ret = IRQ_HANDLED;
 761
 762         /* A-supplied voltage fell too low; overcurrent */
 763         } else if (otg_irq & A_VBUS_ERR) {
 764                 otg_ctrl = OTG_CTRL_REG;
 765                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 766                         state_name(isp), otg_irq, otg_ctrl);
 767
 768                 otg_ctrl |= OTG_BUSDROP;
 769                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 770                 OTG_CTRL_REG = otg_ctrl;
 771                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 772
 773                 OTG_IRQ_SRC_REG = A_VBUS_ERR;
 774                 ret = IRQ_HANDLED;
 775
 776         /* switch driver; the transciever code activates it,
 777          * ungating the udc clock or resuming OHCI.
 778          */
 779         } else if (otg_irq & DRIVER_SWITCH) {
 780                 int     kick = 0;
 781
 782                 otg_ctrl = OTG_CTRL_REG;
 783                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 784                                 state_name(isp),
 785                                 (otg_ctrl & OTG_DRIVER_SEL)
 786                                         ? "gadget" : "host",
 787                                 otg_ctrl);
 788                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 789
 790                 /* role is peripheral */
 791                 if (otg_ctrl & OTG_DRIVER_SEL) {
 792                         switch (isp->otg.state) {
 793                         case OTG_STATE_A_IDLE:
 794                                 b_idle(isp, __FUNCTION__);
 795                                 break;
 796                         default:
 797                                 break;
 798                         }
 799                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 800
 801                 /* role is host */
 802                 } else {
 803                         if (!(otg_ctrl & OTG_ID)) {
 804                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 805                                 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
 806                         }
 807
 808                         if (isp->otg.host) {
 809                                 switch (isp->otg.state) {
 810                                 case OTG_STATE_B_WAIT_ACON:
 811                                         isp->otg.state = OTG_STATE_B_HOST;
 812                                         pr_debug("  --> b_host\n");
 813                                         kick = 1;
 814                                         break;
 815                                 case OTG_STATE_A_WAIT_BCON:
 816                                         isp->otg.state = OTG_STATE_A_HOST;
 817                                         pr_debug("  --> a_host\n");
 818                                         break;
 819                                 case OTG_STATE_A_PERIPHERAL:
 820                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 821                                         pr_debug("  --> a_wait_bcon\n");
 822                                         break;
 823                                 default:
 824                                         break;
 825                                 }
 826                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 827                         }
 828                 }
 829
 830                 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
 831                 ret = IRQ_HANDLED;
 832
 833                 if (kick)
 834                         usb_bus_start_enum(isp->otg.host,
 835                                                 isp->otg.host->otg_port);
 836         }
 837
 838         check_state(isp, __FUNCTION__);
 839         return ret;
 840 }
 841
 842 static struct platform_device *otg_dev;
 843
 844 static int otg_init(struct isp1301 *isp)
 845 {
 846         if (!otg_dev)
 847                 return -ENODEV;
 848
 849         dump_regs(isp, __FUNCTION__);
 850         /* some of these values are board-specific... */
 851         OTG_SYSCON_2_REG |= OTG_EN
 852                 /* for B-device: */
 853                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 854                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 855                 // | (3 << 24)          /* 2msec VBUS pulse */
 856                 /* for A-device: */
 857                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 858                 | SRP_DPW               /* detect 167+ns SRP pulses */
 859                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 860                 ;
 861
 862         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 863         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 864
 865         check_state(isp, __FUNCTION__);
 866         pr_debug("otg: %s, %s %06x\n",
 867                         state_name(isp), __FUNCTION__, OTG_CTRL_REG);
 868
 869         OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
 870                         | B_SRP_TMROUT | B_HNP_FAIL
 871                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
 872         OTG_SYSCON_2_REG |= OTG_EN;
 873
 874         return 0;
 875 }
 876
 877 static int otg_probe(struct platform_device *dev)
 878 {
 879         // struct omap_usb_config *config = dev->platform_data;
 880
 881         otg_dev = dev;
 882         return 0;
 883 }
 884
 885 static int otg_remove(struct platform_device *dev)
 886 {
 887         otg_dev = 0;
 888         return 0;
 889 }
 890
 891 struct platform_driver omap_otg_driver = {
 892         .probe          = otg_probe,
 893         .remove         = otg_remove,
 894         .driver         = {
 895                 .owner  = THIS_MODULE,
 896                 .name   = "omap_otg",
 897         },
 898 };
 899
 900 static int otg_bind(struct isp1301 *isp)
 901 {
 902         int     status;
 903
 904         if (otg_dev)
 905                 return -EBUSY;
 906
 907         status = platform_driver_register(&omap_otg_driver);
 908         if (status < 0)
 909                 return status;
 910
 911         if (otg_dev)
 912                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 913                                 IRQF_DISABLED, DRIVER_NAME, isp);
 914         else
 915                 status = -ENODEV;
 916
 917         if (status < 0)
 918                 platform_driver_unregister(&omap_otg_driver);
 919         return status;
 920 }
 921
 922 static void otg_unbind(struct isp1301 *isp)
 923 {
 924         if (!otg_dev)
 925                 return;
 926         free_irq(otg_dev->resource[1].start, isp);
 927 }
 928
 929 #else
 930
 931 /* OTG controller isn't clocked */
 932
 933 #endif  /* CONFIG_USB_OTG */
 934
 935 /*-------------------------------------------------------------------------*/
 936
 937 static void b_peripheral(struct isp1301 *isp)
 938 {
 939         OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 940         usb_gadget_vbus_connect(isp->otg.gadget);
 941
 942 #ifdef  CONFIG_USB_OTG
 943         enable_vbus_draw(isp, 8);
 944         otg_update_isp(isp);
 945 #else
 946         enable_vbus_draw(isp, 100);
 947         /* UDC driver just set OTG_BSESSVLD */
 948         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 949         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 950         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 951         pr_debug("  --> b_peripheral\n");
 952         dump_regs(isp, "2periph");
 953 #endif
 954 }
 955
 956 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 957 {
 958         u8                      isp_stat, isp_bstat;
 959         enum usb_otg_state      state = isp->otg.state;
 960
 961         if (stat & INTR_BDIS_ACON)
 962                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 963
 964         /* start certain state transitions right away */
 965         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 966         if (isp_stat & INTR_ID_GND) {
 967                 if (isp->otg.default_a) {
 968                         switch (state) {
 969                         case OTG_STATE_B_IDLE:
 970                                 a_idle(isp, "idle");
 971                                 /* FALLTHROUGH */
 972                         case OTG_STATE_A_IDLE:
 973                                 enable_vbus_source(isp);
 974                                 /* FALLTHROUGH */
 975                         case OTG_STATE_A_WAIT_VRISE:
 976                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 977                                  * the HC will transition to A_HOST (or
 978                                  * A_SUSPEND!) without our noticing except
 979                                  * when HNP is used.
 980                                  */
 981                                 if (isp_stat & INTR_VBUS_VLD)
 982                                         isp->otg.state = OTG_STATE_A_HOST;
 983                                 break;
 984                         case OTG_STATE_A_WAIT_VFALL:
 985                                 if (!(isp_stat & INTR_SESS_VLD))
 986                                         a_idle(isp, "vfell");
 987                                 break;
 988                         default:
 989                                 if (!(isp_stat & INTR_VBUS_VLD))
 990                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
 991                                 break;
 992                         }
 993                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 994                 } else {
 995                         switch (state) {
 996                         case OTG_STATE_B_PERIPHERAL:
 997                         case OTG_STATE_B_HOST:
 998                         case OTG_STATE_B_WAIT_ACON:
 999                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1000                                 break;
1001                         default:
1002                                 break;
1003                         }
1004                         if (state != OTG_STATE_A_IDLE)
1005                                 a_idle(isp, "id");
1006                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1007                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1008                         isp_bstat = 0;
1009                 }
1010         } else {
1011                 /* if user unplugged mini-A end of cable,
1012                  * don't bypass A_WAIT_VFALL.
1013                  */
1014                 if (isp->otg.default_a) {
1015                         switch (state) {
1016                         default:
1017                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1018                                 break;
1019                         case OTG_STATE_A_WAIT_VFALL:
1020                                 state = OTG_STATE_A_IDLE;
1021                                 /* khubd may take a while to notice and
1022                                  * handle this disconnect, so don't go
1023                                  * to B_IDLE quite yet.
1024                                  */
1025                                 break;
1026                         case OTG_STATE_A_IDLE:
1027                                 host_suspend(isp);
1028                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1029                                                 MC1_BDIS_ACON_EN);
1030                                 isp->otg.state = OTG_STATE_B_IDLE;
1031                                 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1032                                                 & ~OTG_CTRL_BITS;
1033                                 break;
1034                         case OTG_STATE_B_IDLE:
1035                                 break;
1036                         }
1037                 }
1038                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1039
1040                 switch (isp->otg.state) {
1041                 case OTG_STATE_B_PERIPHERAL:
1042                 case OTG_STATE_B_WAIT_ACON:
1043                 case OTG_STATE_B_HOST:
1044                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1045                                 break;
1046                         enable_vbus_draw(isp, 0);
1047 #ifndef CONFIG_USB_OTG
1048                         /* UDC driver will clear OTG_BSESSVLD */
1049                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1050                                                 OTG1_DP_PULLDOWN);
1051                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1052                                                 OTG1_DP_PULLUP);
1053                         dump_regs(isp, __FUNCTION__);
1054 #endif
1055                         /* FALLTHROUGH */
1056                 case OTG_STATE_B_SRP_INIT:
1057                         b_idle(isp, __FUNCTION__);
1058                         OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1059                         /* FALLTHROUGH */
1060                 case OTG_STATE_B_IDLE:
1061                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1062 #ifdef  CONFIG_USB_OTG
1063                                 update_otg1(isp, isp_stat);
1064                                 update_otg2(isp, isp_bstat);
1065 #endif
1066                                 b_peripheral(isp);
1067                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1068                                 isp_bstat |= OTG_B_SESS_END;
1069                         break;
1070                 case OTG_STATE_A_WAIT_VFALL:
1071                         break;
1072                 default:
1073                         pr_debug("otg: unsupported b-device %s\n",
1074                                 state_name(isp));
1075                         break;
1076                 }
1077         }
1078
1079         if (state != isp->otg.state)
1080                 pr_debug("  isp, %s -> %s\n",
1081                                 state_string(state), state_name(isp));
1082
1083 #ifdef  CONFIG_USB_OTG
1084         /* update the OTG controller state to match the isp1301; may
1085          * trigger OPRT_CHG irqs for changes going to the isp1301.
1086          */
1087         update_otg1(isp, stat); // pass the actual interrupt latch status
1088         update_otg2(isp, isp_bstat);
1089         check_state(isp, __FUNCTION__);
1090 #endif
1091
1092         dump_regs(isp, "isp1301->otg");
1093 }
1094
1095 /*-------------------------------------------------------------------------*/
1096
1097 static u8 isp1301_clear_latch(struct isp1301 *isp)
1098 {
1099         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1100         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1101         return latch;
1102 }
1103
1104 static void
1105 isp1301_work(struct work_struct *work)
1106 {
1107         struct isp1301  *isp = container_of(work, struct isp1301, work);
1108         int             stop;
1109
1110         /* implicit lock:  we're the only task using this device */
1111         isp->working = 1;
1112         do {
1113                 stop = test_bit(WORK_STOP, &isp->todo);
1114
1115 #ifdef  CONFIG_USB_OTG
1116                 /* transfer state from otg engine to isp1301 */
1117                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1118                         otg_update_isp(isp);
1119                         put_device(&isp->client->dev);
1120                 }
1121 #endif
1122                 /* transfer state from isp1301 to otg engine */
1123                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1124                         u8              stat = isp1301_clear_latch(isp);
1125
1126                         isp_update_otg(isp, stat);
1127                         put_device(&isp->client->dev);
1128                 }
1129
1130                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1131                         u32     otg_ctrl;
1132
1133                         /*
1134                          * skip A_WAIT_VRISE; hc transitions invisibly
1135                          * skip A_WAIT_BCON; same.
1136                          */
1137                         switch (isp->otg.state) {
1138                         case OTG_STATE_A_WAIT_BCON:
1139                         case OTG_STATE_A_WAIT_VRISE:
1140                                 isp->otg.state = OTG_STATE_A_HOST;
1141                                 pr_debug("  --> a_host\n");
1142                                 otg_ctrl = OTG_CTRL_REG;
1143                                 otg_ctrl |= OTG_A_BUSREQ;
1144                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1145                                                 & OTG_CTRL_MASK;
1146                                 OTG_CTRL_REG = otg_ctrl;
1147                                 break;
1148                         case OTG_STATE_B_WAIT_ACON:
1149                                 isp->otg.state = OTG_STATE_B_HOST;
1150                                 pr_debug("  --> b_host (acon)\n");
1151                                 break;
1152                         case OTG_STATE_B_HOST:
1153                         case OTG_STATE_B_IDLE:
1154                         case OTG_STATE_A_IDLE:
1155                                 break;
1156                         default:
1157                                 pr_debug("  host resume in %s\n",
1158                                                 state_name(isp));
1159                         }
1160                         host_resume(isp);
1161                         // mdelay(10);
1162                         put_device(&isp->client->dev);
1163                 }
1164
1165                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1166 #ifdef  VERBOSE
1167                         dump_regs(isp, "timer");
1168                         if (!stop)
1169                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1170 #endif
1171                         put_device(&isp->client->dev);
1172                 }
1173
1174                 if (isp->todo)
1175                         dev_vdbg(&isp->client->dev,
1176                                 "work done, todo = 0x%lx\n",
1177                                 isp->todo);
1178                 if (stop) {
1179                         dev_dbg(&isp->client->dev, "stop\n");
1180                         break;
1181                 }
1182         } while (isp->todo);
1183         isp->working = 0;
1184 }
1185
1186 static irqreturn_t isp1301_irq(int irq, void *isp)
1187 {
1188         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1189         return IRQ_HANDLED;
1190 }
1191
1192 static void isp1301_timer(unsigned long _isp)
1193 {
1194         isp1301_defer_work((void *)_isp, WORK_TIMER);
1195 }
1196
1197 /*-------------------------------------------------------------------------*/
1198
1199 static void isp1301_release(struct device *dev)
1200 {
1201         struct i2c_client       *client;
1202         struct isp1301          *isp;
1203
1204         client = container_of(dev, struct i2c_client, dev);
1205         isp = i2c_get_clientdata(client);
1206
1207         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1208         if (isp->i2c_release)
1209                 isp->i2c_release(dev);
1210         kfree (isp);
1211 }
1212
1213 static struct isp1301 *the_transceiver;
1214
1215 static int __exit isp1301_remove(struct i2c_client *client)
1216 {
1217         struct isp1301  *isp = i2c_get_clientdata(client);
1218
1219         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1220         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1221
1222         if (client->irq > 0)
1223                 free_irq(client->irq, isp);
1224 #ifdef  CONFIG_USB_OTG
1225         otg_unbind(isp);
1226 #endif
1227         isp->timer.data = 0;
1228         set_bit(WORK_STOP, &isp->todo);
1229         del_timer_sync(&isp->timer);
1230         flush_scheduled_work();
1231
1232         put_device(&client->dev);
1233         the_transceiver = 0;
1234
1235         return 0;
1236 }
1237
1238 /*-------------------------------------------------------------------------*/
1239
1240 /* NOTE:  three modes are possible here, only one of which
1241  * will be standards-conformant on any given system:
1242  *
1243  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1244  *  - HOST mode, for when there's one or more A (host) connectors
1245  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1246  *
1247  * As a rule, you won't have an isp1301 chip unless it's there to
1248  * support the OTG mode.  Other modes help testing USB controllers
1249  * in isolation from (full) OTG support, or maybe so later board
1250  * revisions can help to support those feature.
1251  */
1252
1253 #ifdef  CONFIG_USB_OTG
1254
1255 static int isp1301_otg_enable(struct isp1301 *isp)
1256 {
1257         power_up(isp);
1258         otg_init(isp);
1259
1260         /* NOTE:  since we don't change this, this provides
1261          * a few more interrupts than are strictly needed.
1262          */
1263         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1264                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1265         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1266                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1267
1268         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1269
1270         return 0;
1271 }
1272
1273 #endif
1274
1275 /* add or disable the host device+driver */
1276 static int
1277 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1278 {
1279         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1280
1281         if (!otg || isp != the_transceiver)
1282                 return -ENODEV;
1283
1284         if (!host) {
1285                 OTG_IRQ_EN_REG = 0;
1286                 power_down(isp);
1287                 isp->otg.host = 0;
1288                 return 0;
1289         }
1290
1291 #ifdef  CONFIG_USB_OTG
1292         isp->otg.host = host;
1293         dev_dbg(&isp->client->dev, "registered host\n");
1294         host_suspend(isp);
1295         if (isp->otg.gadget)
1296                 return isp1301_otg_enable(isp);
1297         return 0;
1298
1299 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1300         // FIXME update its refcount
1301         isp->otg.host = host;
1302
1303         power_up(isp);
1304
1305         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1306         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1307                 INTR_ID_GND);
1308         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1309                 INTR_ID_GND);
1310
1311         /* If this has a Mini-AB connector, this mode is highly
1312          * nonstandard ... but can be handy for testing, especially with
1313          * the Mini-A end of an OTG cable.  (Or something nonstandard
1314          * like MiniB-to-StandardB, maybe built with a gender mender.)
1315          */
1316         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1317
1318         dump_regs(isp, __FUNCTION__);
1319
1320         return 0;
1321
1322 #else
1323         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1324         return -EINVAL;
1325 #endif
1326
1327 }
1328
1329 static int
1330 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1331 {
1332         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1333
1334         if (!otg || isp != the_transceiver)
1335                 return -ENODEV;
1336
1337         if (!gadget) {
1338                 OTG_IRQ_EN_REG = 0;
1339                 if (!isp->otg.default_a)
1340                         enable_vbus_draw(isp, 0);
1341                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1342                 isp->otg.gadget = 0;
1343                 power_down(isp);
1344                 return 0;
1345         }
1346
1347 #ifdef  CONFIG_USB_OTG
1348         isp->otg.gadget = gadget;
1349         dev_dbg(&isp->client->dev, "registered gadget\n");
1350         /* gadget driver may be suspended until vbus_connect () */
1351         if (isp->otg.host)
1352                 return isp1301_otg_enable(isp);
1353         return 0;
1354
1355 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1356         isp->otg.gadget = gadget;
1357         // FIXME update its refcount
1358
1359         OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1360                                 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1361                         | OTG_ID;
1362         power_up(isp);
1363         isp->otg.state = OTG_STATE_B_IDLE;
1364
1365 // XXX h4 too?
1366         if (machine_is_omap_h2() || machine_is_omap_h3())
1367                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1368
1369         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1370                 INTR_SESS_VLD | INTR_VBUS_VLD);
1371         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1372                 INTR_VBUS_VLD | INTR_SESS_VLD);
1373         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1374         dump_regs(isp, __FUNCTION__);
1375
1376         /* If this has a Mini-AB connector, this mode is highly
1377          * nonstandard ... but can be handy for testing, so long
1378          * as you don't plug a Mini-A cable into the jack.
1379          */
1380         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1381                 b_peripheral(isp);
1382
1383         return 0;
1384
1385 #else
1386         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1387         return -EINVAL;
1388 #endif
1389 }
1390
1391
1392 /*-------------------------------------------------------------------------*/
1393
1394 static int
1395 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1396 {
1397         if (!the_transceiver)
1398                 return -ENODEV;
1399         if (dev->state == OTG_STATE_B_PERIPHERAL)
1400                 enable_vbus_draw(the_transceiver, mA);
1401         return 0;
1402 }
1403
1404 static int
1405 isp1301_start_srp(struct otg_transceiver *dev)
1406 {
1407         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1408         u32             otg_ctrl;
1409
1410         if (!dev || isp != the_transceiver
1411                         || isp->otg.state != OTG_STATE_B_IDLE)
1412                 return -ENODEV;
1413
1414         otg_ctrl = OTG_CTRL_REG;
1415         if (!(otg_ctrl & OTG_BSESSEND))
1416                 return -EINVAL;
1417
1418         otg_ctrl |= OTG_B_BUSREQ;
1419         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1420         OTG_CTRL_REG = otg_ctrl;
1421         isp->otg.state = OTG_STATE_B_SRP_INIT;
1422
1423         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1424 #ifdef  CONFIG_USB_OTG
1425         check_state(isp, __FUNCTION__);
1426 #endif
1427         return 0;
1428 }
1429
1430 static int
1431 isp1301_start_hnp(struct otg_transceiver *dev)
1432 {
1433 #ifdef  CONFIG_USB_OTG
1434         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1435
1436         if (!dev || isp != the_transceiver)
1437                 return -ENODEV;
1438         if (isp->otg.default_a && (isp->otg.host == NULL
1439                         || !isp->otg.host->b_hnp_enable))
1440                 return -ENOTCONN;
1441         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1442                         || !isp->otg.gadget->b_hnp_enable))
1443                 return -ENOTCONN;
1444
1445         /* We want hardware to manage most HNP protocol timings.
1446          * So do this part as early as possible...
1447          */
1448         switch (isp->otg.state) {
1449         case OTG_STATE_B_PERIPHERAL:
1450                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
1451                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
1452                 break;
1453         case OTG_STATE_B_HOST:
1454                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1455                 /* caller will suspend next */
1456                 break;
1457         case OTG_STATE_A_HOST:
1458 #if 0
1459                 /* autoconnect mode avoids irq latency bugs */
1460                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1461                                 MC1_BDIS_ACON_EN);
1462 #endif
1463                 /* caller must suspend then clear A_BUSREQ */
1464                 usb_gadget_vbus_connect(isp->otg.gadget);
1465                 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1466
1467                 break;
1468         case OTG_STATE_A_PERIPHERAL:
1469                 /* initiated by B-Host suspend */
1470                 break;
1471         default:
1472                 return -EILSEQ;
1473         }
1474         pr_debug("otg: HNP %s, %06x ...\n",
1475                 state_name(isp), OTG_CTRL_REG);
1476         check_state(isp, __FUNCTION__);
1477         return 0;
1478 #else
1479         /* srp-only */
1480         return -EINVAL;
1481 #endif
1482 }
1483
1484 /*-------------------------------------------------------------------------*/
1485
1486 /* no error returns, they'd just make bus scanning stop */
1487 static int __init isp1301_probe(struct i2c_client *client)
1488 {
1489         int                     status;
1490         struct isp1301          *isp;
1491
1492         if (the_transceiver)
1493                 return 0;
1494
1495         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1496         if (!isp)
1497                 return 0;
1498
1499         INIT_WORK(&isp->work, isp1301_work);
1500         init_timer(&isp->timer);
1501         isp->timer.function = isp1301_timer;
1502         isp->timer.data = (unsigned long) isp;
1503         isp->client = client;
1504
1505         /* if this is a true probe, verify the chip ... */
1506         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1507         if (status != I2C_VENDOR_ID_PHILIPS) {
1508                 dev_dbg(&client->dev, "not philips id: %d\n",
1509                                 status);
1510                 goto fail1;
1511         }
1512         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1513         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1514                 dev_dbg(&client->dev, "not isp1301, %d\n",
1515                                 status);
1516                 goto fail1;
1517         }
1518
1519         if (status < 0) {
1520                 dev_dbg(&client->dev, "can't attach %s to device, err %d\n",
1521                                 DRIVER_NAME, status);
1522 fail1:
1523                 kfree(isp);
1524                 return 0;
1525         }
1526         isp->i2c_release = client->dev.release;
1527         client->dev.release = isp1301_release;
1528
1529         /* initial development used chiprev 2.00 */
1530         status = i2c_smbus_read_word_data(client, ISP1301_BCD_DEVICE);
1531         dev_info(&client->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1532                 status >> 8, status & 0xff);
1533
1534         /* make like power-on reset */
1535         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1536
1537         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1538         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1539
1540         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1541                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1542         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1543                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1544
1545         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1546         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1547         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1548
1549 #ifdef  CONFIG_USB_OTG
1550         status = otg_bind(isp);
1551         if (status < 0) {
1552                 dev_dbg(&client->dev, "can't bind OTG\n");
1553                 goto fail2;
1554         }
1555 #endif
1556
1557         status = request_irq(client->irq, isp1301_irq,
1558                         IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
1559                         DRIVER_NAME, isp);
1560         if (status < 0) {
1561                 dev_dbg(&client->dev, "can't get IRQ %d, err %d\n",
1562                                 client->irq, status);
1563 #ifdef  CONFIG_USB_OTG
1564 fail2:
1565 #endif
1566                 i2c_detach_client(client);
1567                 goto fail1;
1568         }
1569
1570         isp->otg.dev = &client->dev;
1571         isp->otg.label = DRIVER_NAME;
1572
1573         isp->otg.set_host = isp1301_set_host,
1574         isp->otg.set_peripheral = isp1301_set_peripheral,
1575         isp->otg.set_power = isp1301_set_power,
1576         isp->otg.start_srp = isp1301_start_srp,
1577         isp->otg.start_hnp = isp1301_start_hnp,
1578
1579         enable_vbus_draw(isp, 0);
1580         power_down(isp);
1581         the_transceiver = isp;
1582
1583 #ifdef  CONFIG_USB_OTG
1584         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1585         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1586 #endif
1587         dump_regs(isp, __FUNCTION__);
1588
1589 #ifdef  VERBOSE
1590         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1591         dev_dbg(&client->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1592 #endif
1593
1594         status = otg_set_transceiver(&isp->otg);
1595         if (status < 0)
1596                 dev_err(&client->dev, "can't register transceiver, %d\n",
1597                         status);
1598
1599         return 0;
1600 }
1601
1602 static struct i2c_driver isp1301_driver = {
1603         .driver = {
1604                 .name   = "isp1301_omap",
1605         },
1606         .probe  = isp1301_probe,
1607         .remove = __exit_p(isp1301_remove),
1608 };
1609
1610 /*-------------------------------------------------------------------------*/
1611
1612 static int __init isp_init(void)
1613 {
1614         int     status = -ENODEV;
1615
1616         printk(KERN_INFO "%s: version %s\n", DRIVER_NAME, DRIVER_VERSION);
1617
1618         status = i2c_add_driver(&isp1301_driver);
1619         if (status)
1620                 printk(KERN_ERR "%s failed to probe\n", DRIVER_NAME);
1621
1622         return status;
1623 }
1624 module_init(isp_init);
1625
1626 static void __exit isp_exit(void)
1627 {
1628         if (the_transceiver)
1629                 otg_set_transceiver(0);
1630         i2c_del_driver(&isp1301_driver);
1631 }
1632 module_exit(isp_exit);
1633