drivers/usb/otg/isp1301_omap.c

   1 /*
   2  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004 Texas Instruments
   5  * Copyright (C) 2004 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/gpio.h>
  29 #include <linux/usb/ch9.h>
  30 #include <linux/usb/gadget.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/otg.h>
  33 #include <linux/i2c.h>
  34 #include <linux/workqueue.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/mach-types.h>
  38
  39 #include <plat/usb.h>
  40 #include <plat/mux.h>
  41
  42
  43 #ifndef DEBUG
  44 #undef  VERBOSE
  45 #endif
  46
  47
  48 #define DRIVER_VERSION  "24 August 2004"
  49 #define DRIVER_NAME     (isp1301_driver.driver.name)
  50
  51 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 struct isp1301 {
  55         struct otg_transceiver  otg;
  56         struct i2c_client       *client;
  57         void                    (*i2c_release)(struct device *dev);
  58
  59         int                     irq_type;
  60
  61         u32                     last_otg_ctrl;
  62         unsigned                working:1;
  63
  64         struct timer_list       timer;
  65
  66         /* use keventd context to change the state for us */
  67         struct work_struct      work;
  68
  69         unsigned long           todo;
  70 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  71 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  72 #               define WORK_HOST_RESUME 4       /* resume host */
  73 #               define WORK_TIMER       6       /* timer fired */
  74 #               define WORK_STOP        7       /* don't resubmit */
  75 };
  76
  77
  78 /* bits in OTG_CTRL */
  79
  80 #define OTG_XCEIV_OUTPUTS \
  81         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  82 #define OTG_XCEIV_INPUTS \
  83         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  84 #define OTG_CTRL_BITS \
  85         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  86         /* and OTG_PULLUP is sometimes written */
  87
  88 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  89         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  90         OTG_CTRL_BITS)
  91
  92
  93 /*-------------------------------------------------------------------------*/
  94
  95 /* board-specific PM hooks */
  96
  97 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  98
  99 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 100
 101 #include <linux/i2c/tps65010.h>
 102
 103 #else
 104
 105 static inline int tps65010_set_vbus_draw(unsigned mA)
 106 {
 107         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 108         return 0;
 109 }
 110
 111 #endif
 112
 113 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 114 {
 115         int status = tps65010_set_vbus_draw(mA);
 116         if (status < 0)
 117                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 118 }
 119
 120 #else
 121
 122 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 123 {
 124         /* H4 controls this by DIP switch S2.4; no soft control.
 125          * ON means the charger is always enabled.  Leave it OFF
 126          * unless the OTG port is used only in B-peripheral mode.
 127          */
 128 }
 129
 130 #endif
 131
 132 static void enable_vbus_source(struct isp1301 *isp)
 133 {
 134         /* this board won't supply more than 8mA vbus power.
 135          * some boards can switch a 100ma "unit load" (or more).
 136          */
 137 }
 138
 139
 140 /* products will deliver OTG messages with LEDs, GUI, etc */
 141 static inline void notresponding(struct isp1301 *isp)
 142 {
 143         printk(KERN_NOTICE "OTG device not responding.\n");
 144 }
 145
 146
 147 /*-------------------------------------------------------------------------*/
 148
 149 static struct i2c_driver isp1301_driver;
 150
 151 /* smbus apis are used for portability */
 152
 153 static inline u8
 154 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 155 {
 156         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 157 }
 158
 159 static inline int
 160 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 161 {
 162         return i2c_smbus_read_word_data(isp->client, reg);
 163 }
 164
 165 static inline int
 166 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 167 {
 168         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 169 }
 170
 171 static inline int
 172 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 173 {
 174         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 175 }
 176
 177 /*-------------------------------------------------------------------------*/
 178
 179 /* identification */
 180 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 181 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 182 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 183
 184 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 185 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 186
 187 /* operational registers */
 188 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 189 #       define  MC1_SPEED               (1 << 0)
 190 #       define  MC1_SUSPEND             (1 << 1)
 191 #       define  MC1_DAT_SE0             (1 << 2)
 192 #       define  MC1_TRANSPARENT         (1 << 3)
 193 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 194 #       define  MC1_OE_INT_EN           (1 << 5)
 195 #       define  MC1_UART_EN             (1 << 6)
 196 #       define  MC1_MASK                0x7f
 197 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 198 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 199 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 200 #       define  MC2_BI_DI               (1 << 2)
 201 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 202 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 203 #       define  MC2_AUDIO_EN            (1 << 5)
 204 #       define  MC2_PSW_EN              (1 << 6)
 205 #       define  MC2_EN2V7               (1 << 7)
 206 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 207 #       define  OTG1_DP_PULLUP          (1 << 0)
 208 #       define  OTG1_DM_PULLUP          (1 << 1)
 209 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 210 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 211 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 212 #       define  OTG1_VBUS_DRV           (1 << 5)
 213 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 214 #       define  OTG1_VBUS_CHRG          (1 << 7)
 215 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 216 #       define  OTG_B_SESS_END          (1 << 6)
 217 #       define  OTG_B_SESS_VLD          (1 << 7)
 218
 219 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 220 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 221
 222 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 223 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 224
 225 /* same bitfields in all interrupt registers */
 226 #       define  INTR_VBUS_VLD           (1 << 0)
 227 #       define  INTR_SESS_VLD           (1 << 1)
 228 #       define  INTR_DP_HI              (1 << 2)
 229 #       define  INTR_ID_GND             (1 << 3)
 230 #       define  INTR_DM_HI              (1 << 4)
 231 #       define  INTR_ID_FLOAT           (1 << 5)
 232 #       define  INTR_BDIS_ACON          (1 << 6)
 233 #       define  INTR_CR_INT             (1 << 7)
 234
 235 /*-------------------------------------------------------------------------*/
 236
 237 static const char *state_string(enum usb_otg_state state)
 238 {
 239         switch (state) {
 240         case OTG_STATE_A_IDLE:          return "a_idle";
 241         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 242         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 243         case OTG_STATE_A_HOST:          return "a_host";
 244         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 245         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 246         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 247         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 248         case OTG_STATE_B_IDLE:          return "b_idle";
 249         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 250         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 251         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 252         case OTG_STATE_B_HOST:          return "b_host";
 253         default:                        return "UNDEFINED";
 254         }
 255 }
 256
 257 static inline const char *state_name(struct isp1301 *isp)
 258 {
 259         return state_string(isp->otg.state);
 260 }
 261
 262 /*-------------------------------------------------------------------------*/
 263
 264 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 265  * not everything is guarded by board-specific checks, or even using
 266  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 267  *
 268  * ALSO:  this currently doesn't use ISP1301 low-power modes
 269  * while OTG is running.
 270  */
 271
 272 static void power_down(struct isp1301 *isp)
 273 {
 274         isp->otg.state = OTG_STATE_UNDEFINED;
 275
 276         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 277         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 278
 279         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 280         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 281 }
 282
 283 static void power_up(struct isp1301 *isp)
 284 {
 285         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 286         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 287
 288         /* do this only when cpu is driving transceiver,
 289          * so host won't see a low speed device...
 290          */
 291         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 292 }
 293
 294 #define NO_HOST_SUSPEND
 295
 296 static int host_suspend(struct isp1301 *isp)
 297 {
 298 #ifdef  NO_HOST_SUSPEND
 299         return 0;
 300 #else
 301         struct device   *dev;
 302
 303         if (!isp->otg.host)
 304                 return -ENODEV;
 305
 306         /* Currently ASSUMES only the OTG port matters;
 307          * other ports could be active...
 308          */
 309         dev = isp->otg.host->controller;
 310         return dev->driver->suspend(dev, 3, 0);
 311 #endif
 312 }
 313
 314 static int host_resume(struct isp1301 *isp)
 315 {
 316 #ifdef  NO_HOST_SUSPEND
 317         return 0;
 318 #else
 319         struct device   *dev;
 320
 321         if (!isp->otg.host)
 322                 return -ENODEV;
 323
 324         dev = isp->otg.host->controller;
 325         return dev->driver->resume(dev, 0);
 326 #endif
 327 }
 328
 329 static int gadget_suspend(struct isp1301 *isp)
 330 {
 331         isp->otg.gadget->b_hnp_enable = 0;
 332         isp->otg.gadget->a_hnp_support = 0;
 333         isp->otg.gadget->a_alt_hnp_support = 0;
 334         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 335 }
 336
 337 /*-------------------------------------------------------------------------*/
 338
 339 #define TIMER_MINUTES   10
 340 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 341
 342 /* Almost all our I2C messaging comes from a work queue's task context.
 343  * NOTE: guaranteeing certain response times might mean we shouldn't
 344  * share keventd's work queue; a realtime task might be safest.
 345  */
 346 static void isp1301_defer_work(struct isp1301 *isp, int work)
 347 {
 348         int status;
 349
 350         if (isp && !test_and_set_bit(work, &isp->todo)) {
 351                 (void) get_device(&isp->client->dev);
 352                 status = schedule_work(&isp->work);
 353                 if (!status && !isp->working)
 354                         dev_vdbg(&isp->client->dev,
 355                                 "work item %d may be lost\n", work);
 356         }
 357 }
 358
 359 /* called from irq handlers */
 360 static void a_idle(struct isp1301 *isp, const char *tag)
 361 {
 362         u32 l;
 363
 364         if (isp->otg.state == OTG_STATE_A_IDLE)
 365                 return;
 366
 367         isp->otg.default_a = 1;
 368         if (isp->otg.host) {
 369                 isp->otg.host->is_b_host = 0;
 370                 host_suspend(isp);
 371         }
 372         if (isp->otg.gadget) {
 373                 isp->otg.gadget->is_a_peripheral = 1;
 374                 gadget_suspend(isp);
 375         }
 376         isp->otg.state = OTG_STATE_A_IDLE;
 377         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 378         omap_writel(l, OTG_CTRL);
 379         isp->last_otg_ctrl = l;
 380         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 381 }
 382
 383 /* called from irq handlers */
 384 static void b_idle(struct isp1301 *isp, const char *tag)
 385 {
 386         u32 l;
 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         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 402         omap_writel(l, OTG_CTRL);
 403         isp->last_otg_ctrl = l;
 404         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 405 }
 406
 407 static void
 408 dump_regs(struct isp1301 *isp, const char *label)
 409 {
 410 #ifdef  DEBUG
 411         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 412         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 413         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 414
 415         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 416                 omap_readl(OTG_CTRL), label, state_name(isp),
 417                 ctrl, status, src);
 418         /* mode control and irq enables don't change much */
 419 #endif
 420 }
 421
 422 /*-------------------------------------------------------------------------*/
 423
 424 #ifdef  CONFIG_USB_OTG
 425
 426 /*
 427  * The OMAP OTG controller handles most of the OTG state transitions.
 428  *
 429  * We translate isp1301 outputs (mostly voltage comparator status) into
 430  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 431  * flags into isp1301 inputs ... and infer state transitions.
 432  */
 433
 434 #ifdef  VERBOSE
 435
 436 static void check_state(struct isp1301 *isp, const char *tag)
 437 {
 438         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 439         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 440         unsigned                extra = 0;
 441
 442         switch (fsm) {
 443
 444         /* default-b */
 445         case 0x0:
 446                 state = OTG_STATE_B_IDLE;
 447                 break;
 448         case 0x3:
 449         case 0x7:
 450                 extra = 1;
 451         case 0x1:
 452                 state = OTG_STATE_B_PERIPHERAL;
 453                 break;
 454         case 0x11:
 455                 state = OTG_STATE_B_SRP_INIT;
 456                 break;
 457
 458         /* extra dual-role default-b states */
 459         case 0x12:
 460         case 0x13:
 461         case 0x16:
 462                 extra = 1;
 463         case 0x17:
 464                 state = OTG_STATE_B_WAIT_ACON;
 465                 break;
 466         case 0x34:
 467                 state = OTG_STATE_B_HOST;
 468                 break;
 469
 470         /* default-a */
 471         case 0x36:
 472                 state = OTG_STATE_A_IDLE;
 473                 break;
 474         case 0x3c:
 475                 state = OTG_STATE_A_WAIT_VFALL;
 476                 break;
 477         case 0x7d:
 478                 state = OTG_STATE_A_VBUS_ERR;
 479                 break;
 480         case 0x9e:
 481         case 0x9f:
 482                 extra = 1;
 483         case 0x89:
 484                 state = OTG_STATE_A_PERIPHERAL;
 485                 break;
 486         case 0xb7:
 487                 state = OTG_STATE_A_WAIT_VRISE;
 488                 break;
 489         case 0xb8:
 490                 state = OTG_STATE_A_WAIT_BCON;
 491                 break;
 492         case 0xb9:
 493                 state = OTG_STATE_A_HOST;
 494                 break;
 495         case 0xba:
 496                 state = OTG_STATE_A_SUSPEND;
 497                 break;
 498         default:
 499                 break;
 500         }
 501         if (isp->otg.state == state && !extra)
 502                 return;
 503         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 504                 state_string(state), fsm, state_name(isp),
 505                 omap_readl(OTG_CTRL));
 506 }
 507
 508 #else
 509
 510 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 511
 512 #endif
 513
 514 /* outputs from ISP1301_INTERRUPT_SOURCE */
 515 static void update_otg1(struct isp1301 *isp, u8 int_src)
 516 {
 517         u32     otg_ctrl;
 518
 519         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 520         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 521         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 522
 523         if (int_src & INTR_SESS_VLD)
 524                 otg_ctrl |= OTG_ASESSVLD;
 525         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 526                 a_idle(isp, "vfall");
 527                 otg_ctrl &= ~OTG_CTRL_BITS;
 528         }
 529         if (int_src & INTR_VBUS_VLD)
 530                 otg_ctrl |= OTG_VBUSVLD;
 531         if (int_src & INTR_ID_GND) {            /* default-A */
 532                 if (isp->otg.state == OTG_STATE_B_IDLE
 533                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 534                         a_idle(isp, "init");
 535                         return;
 536                 }
 537         } else {                                /* default-B */
 538                 otg_ctrl |= OTG_ID;
 539                 if (isp->otg.state == OTG_STATE_A_IDLE
 540                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 541                         b_idle(isp, "init");
 542                         return;
 543                 }
 544         }
 545         omap_writel(otg_ctrl, OTG_CTRL);
 546 }
 547
 548 /* outputs from ISP1301_OTG_STATUS */
 549 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 550 {
 551         u32     otg_ctrl;
 552
 553         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 554         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 555         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 556         if (otg_status & OTG_B_SESS_VLD)
 557                 otg_ctrl |= OTG_BSESSVLD;
 558         else if (otg_status & OTG_B_SESS_END)
 559                 otg_ctrl |= OTG_BSESSEND;
 560         omap_writel(otg_ctrl, OTG_CTRL);
 561 }
 562
 563 /* inputs going to ISP1301 */
 564 static void otg_update_isp(struct isp1301 *isp)
 565 {
 566         u32     otg_ctrl, otg_change;
 567         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 568
 569         otg_ctrl = omap_readl(OTG_CTRL);
 570         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 571         isp->last_otg_ctrl = otg_ctrl;
 572         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 573
 574         switch (isp->otg.state) {
 575         case OTG_STATE_B_IDLE:
 576         case OTG_STATE_B_PERIPHERAL:
 577         case OTG_STATE_B_SRP_INIT:
 578                 if (!(otg_ctrl & OTG_PULLUP)) {
 579                         // if (otg_ctrl & OTG_B_HNPEN) {
 580                         if (isp->otg.gadget->b_hnp_enable) {
 581                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 582                                 pr_debug("  --> b_wait_acon\n");
 583                         }
 584                         goto pulldown;
 585                 }
 586 pullup:
 587                 set |= OTG1_DP_PULLUP;
 588                 clr |= OTG1_DP_PULLDOWN;
 589                 break;
 590         case OTG_STATE_A_SUSPEND:
 591         case OTG_STATE_A_PERIPHERAL:
 592                 if (otg_ctrl & OTG_PULLUP)
 593                         goto pullup;
 594                 /* FALLTHROUGH */
 595         // case OTG_STATE_B_WAIT_ACON:
 596         default:
 597 pulldown:
 598                 set |= OTG1_DP_PULLDOWN;
 599                 clr |= OTG1_DP_PULLUP;
 600                 break;
 601         }
 602
 603 #       define toggle(OTG,ISP) do { \
 604                 if (otg_ctrl & OTG) set |= ISP; \
 605                 else clr |= ISP; \
 606                 } while (0)
 607
 608         if (!(isp->otg.host))
 609                 otg_ctrl &= ~OTG_DRV_VBUS;
 610
 611         switch (isp->otg.state) {
 612         case OTG_STATE_A_SUSPEND:
 613                 if (otg_ctrl & OTG_DRV_VBUS) {
 614                         set |= OTG1_VBUS_DRV;
 615                         break;
 616                 }
 617                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 618                 notresponding(isp);
 619
 620                 /* FALLTHROUGH */
 621         case OTG_STATE_A_VBUS_ERR:
 622                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 623                 pr_debug("  --> a_wait_vfall\n");
 624                 /* FALLTHROUGH */
 625         case OTG_STATE_A_WAIT_VFALL:
 626                 /* FIXME usbcore thinks port power is still on ... */
 627                 clr |= OTG1_VBUS_DRV;
 628                 break;
 629         case OTG_STATE_A_IDLE:
 630                 if (otg_ctrl & OTG_DRV_VBUS) {
 631                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 632                         pr_debug("  --> a_wait_vrise\n");
 633                 }
 634                 /* FALLTHROUGH */
 635         default:
 636                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 637         }
 638
 639         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 640         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 641
 642 #       undef toggle
 643
 644         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 645         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 646
 647         /* HNP switch to host or peripheral; and SRP */
 648         if (otg_change & OTG_PULLUP) {
 649                 u32 l;
 650
 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                 l = omap_readl(OTG_CTRL);
 668                 l |= OTG_PULLUP;
 669                 omap_writel(l, OTG_CTRL);
 670         }
 671
 672         check_state(isp, __func__);
 673         dump_regs(isp, "otg->isp1301");
 674 }
 675
 676 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 677 {
 678         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 679         u32             otg_ctrl;
 680         int             ret = IRQ_NONE;
 681         struct isp1301  *isp = _isp;
 682
 683         /* update ISP1301 transciever from OTG controller */
 684         if (otg_irq & OPRT_CHG) {
 685                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 686                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 687                 ret = IRQ_HANDLED;
 688
 689         /* SRP to become b_peripheral failed */
 690         } else if (otg_irq & B_SRP_TMROUT) {
 691                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 692                 notresponding(isp);
 693
 694                 /* gadget drivers that care should monitor all kinds of
 695                  * remote wakeup (SRP, normal) using their own timer
 696                  * to give "check cable and A-device" messages.
 697                  */
 698                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 699                         b_idle(isp, "srp_timeout");
 700
 701                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 702                 ret = IRQ_HANDLED;
 703
 704         /* HNP to become b_host failed */
 705         } else if (otg_irq & B_HNP_FAIL) {
 706                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 707                                 state_name(isp), omap_readl(OTG_CTRL));
 708                 notresponding(isp);
 709
 710                 otg_ctrl = omap_readl(OTG_CTRL);
 711                 otg_ctrl |= OTG_BUSDROP;
 712                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 713                 omap_writel(otg_ctrl, OTG_CTRL);
 714
 715                 /* subset of b_peripheral()... */
 716                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 717                 pr_debug("  --> b_peripheral\n");
 718
 719                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 720                 ret = IRQ_HANDLED;
 721
 722         /* detect SRP from B-device ... */
 723         } else if (otg_irq & A_SRP_DETECT) {
 724                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 725                                 state_name(isp), omap_readl(OTG_CTRL));
 726
 727                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 728                 switch (isp->otg.state) {
 729                 case OTG_STATE_A_IDLE:
 730                         if (!isp->otg.host)
 731                                 break;
 732                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 733                         otg_ctrl = omap_readl(OTG_CTRL);
 734                         otg_ctrl |= OTG_A_BUSREQ;
 735                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 736                                         & ~OTG_XCEIV_INPUTS
 737                                         & OTG_CTRL_MASK;
 738                         omap_writel(otg_ctrl, OTG_CTRL);
 739                         break;
 740                 default:
 741                         break;
 742                 }
 743
 744                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 745                 ret = IRQ_HANDLED;
 746
 747         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 748          * we don't track them separately
 749          */
 750         } else if (otg_irq & A_REQ_TMROUT) {
 751                 otg_ctrl = omap_readl(OTG_CTRL);
 752                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 753                                 state_name(isp), otg_ctrl);
 754                 notresponding(isp);
 755
 756                 otg_ctrl |= OTG_BUSDROP;
 757                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 758                 omap_writel(otg_ctrl, OTG_CTRL);
 759                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 760
 761                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 762                 ret = IRQ_HANDLED;
 763
 764         /* A-supplied voltage fell too low; overcurrent */
 765         } else if (otg_irq & A_VBUS_ERR) {
 766                 otg_ctrl = omap_readl(OTG_CTRL);
 767                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 768                         state_name(isp), otg_irq, otg_ctrl);
 769
 770                 otg_ctrl |= OTG_BUSDROP;
 771                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 772                 omap_writel(otg_ctrl, OTG_CTRL);
 773                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 774
 775                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 776                 ret = IRQ_HANDLED;
 777
 778         /* switch driver; the transciever code activates it,
 779          * ungating the udc clock or resuming OHCI.
 780          */
 781         } else if (otg_irq & DRIVER_SWITCH) {
 782                 int     kick = 0;
 783
 784                 otg_ctrl = omap_readl(OTG_CTRL);
 785                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 786                                 state_name(isp),
 787                                 (otg_ctrl & OTG_DRIVER_SEL)
 788                                         ? "gadget" : "host",
 789                                 otg_ctrl);
 790                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 791
 792                 /* role is peripheral */
 793                 if (otg_ctrl & OTG_DRIVER_SEL) {
 794                         switch (isp->otg.state) {
 795                         case OTG_STATE_A_IDLE:
 796                                 b_idle(isp, __func__);
 797                                 break;
 798                         default:
 799                                 break;
 800                         }
 801                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 802
 803                 /* role is host */
 804                 } else {
 805                         if (!(otg_ctrl & OTG_ID)) {
 806                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 807                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 808                         }
 809
 810                         if (isp->otg.host) {
 811                                 switch (isp->otg.state) {
 812                                 case OTG_STATE_B_WAIT_ACON:
 813                                         isp->otg.state = OTG_STATE_B_HOST;
 814                                         pr_debug("  --> b_host\n");
 815                                         kick = 1;
 816                                         break;
 817                                 case OTG_STATE_A_WAIT_BCON:
 818                                         isp->otg.state = OTG_STATE_A_HOST;
 819                                         pr_debug("  --> a_host\n");
 820                                         break;
 821                                 case OTG_STATE_A_PERIPHERAL:
 822                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 823                                         pr_debug("  --> a_wait_bcon\n");
 824                                         break;
 825                                 default:
 826                                         break;
 827                                 }
 828                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 829                         }
 830                 }
 831
 832                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 833                 ret = IRQ_HANDLED;
 834
 835                 if (kick)
 836                         usb_bus_start_enum(isp->otg.host,
 837                                                 isp->otg.host->otg_port);
 838         }
 839
 840         check_state(isp, __func__);
 841         return ret;
 842 }
 843
 844 static struct platform_device *otg_dev;
 845
 846 static int isp1301_otg_init(struct isp1301 *isp)
 847 {
 848         u32 l;
 849
 850         if (!otg_dev)
 851                 return -ENODEV;
 852
 853         dump_regs(isp, __func__);
 854         /* some of these values are board-specific... */
 855         l = omap_readl(OTG_SYSCON_2);
 856         l |= OTG_EN
 857                 /* for B-device: */
 858                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 859                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 860                 // | (3 << 24)          /* 2msec VBUS pulse */
 861                 /* for A-device: */
 862                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 863                 | SRP_DPW               /* detect 167+ns SRP pulses */
 864                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 865                 ;
 866         omap_writel(l, OTG_SYSCON_2);
 867
 868         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 869         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 870
 871         check_state(isp, __func__);
 872         pr_debug("otg: %s, %s %06x\n",
 873                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 874
 875         omap_writew(DRIVER_SWITCH | OPRT_CHG
 876                         | B_SRP_TMROUT | B_HNP_FAIL
 877                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 878
 879         l = omap_readl(OTG_SYSCON_2);
 880         l |= OTG_EN;
 881         omap_writel(l, OTG_SYSCON_2);
 882
 883         return 0;
 884 }
 885
 886 static int otg_probe(struct platform_device *dev)
 887 {
 888         // struct omap_usb_config *config = dev->platform_data;
 889
 890         otg_dev = dev;
 891         return 0;
 892 }
 893
 894 static int otg_remove(struct platform_device *dev)
 895 {
 896         otg_dev = NULL;
 897         return 0;
 898 }
 899
 900 static struct platform_driver omap_otg_driver = {
 901         .probe          = otg_probe,
 902         .remove         = otg_remove,
 903         .driver         = {
 904                 .owner  = THIS_MODULE,
 905                 .name   = "omap_otg",
 906         },
 907 };
 908
 909 static int otg_bind(struct isp1301 *isp)
 910 {
 911         int     status;
 912
 913         if (otg_dev)
 914                 return -EBUSY;
 915
 916         status = platform_driver_register(&omap_otg_driver);
 917         if (status < 0)
 918                 return status;
 919
 920         if (otg_dev)
 921                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 922                                 IRQF_DISABLED, DRIVER_NAME, isp);
 923         else
 924                 status = -ENODEV;
 925
 926         if (status < 0)
 927                 platform_driver_unregister(&omap_otg_driver);
 928         return status;
 929 }
 930
 931 static void otg_unbind(struct isp1301 *isp)
 932 {
 933         if (!otg_dev)
 934                 return;
 935         free_irq(otg_dev->resource[1].start, isp);
 936 }
 937
 938 #else
 939
 940 /* OTG controller isn't clocked */
 941
 942 #endif  /* CONFIG_USB_OTG */
 943
 944 /*-------------------------------------------------------------------------*/
 945
 946 static void b_peripheral(struct isp1301 *isp)
 947 {
 948         u32 l;
 949
 950         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 951         omap_writel(l, OTG_CTRL);
 952
 953         usb_gadget_vbus_connect(isp->otg.gadget);
 954
 955 #ifdef  CONFIG_USB_OTG
 956         enable_vbus_draw(isp, 8);
 957         otg_update_isp(isp);
 958 #else
 959         enable_vbus_draw(isp, 100);
 960         /* UDC driver just set OTG_BSESSVLD */
 961         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 962         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 963         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 964         pr_debug("  --> b_peripheral\n");
 965         dump_regs(isp, "2periph");
 966 #endif
 967 }
 968
 969 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 970 {
 971         u8                      isp_stat, isp_bstat;
 972         enum usb_otg_state      state = isp->otg.state;
 973
 974         if (stat & INTR_BDIS_ACON)
 975                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 976
 977         /* start certain state transitions right away */
 978         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 979         if (isp_stat & INTR_ID_GND) {
 980                 if (isp->otg.default_a) {
 981                         switch (state) {
 982                         case OTG_STATE_B_IDLE:
 983                                 a_idle(isp, "idle");
 984                                 /* FALLTHROUGH */
 985                         case OTG_STATE_A_IDLE:
 986                                 enable_vbus_source(isp);
 987                                 /* FALLTHROUGH */
 988                         case OTG_STATE_A_WAIT_VRISE:
 989                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 990                                  * the HC will transition to A_HOST (or
 991                                  * A_SUSPEND!) without our noticing except
 992                                  * when HNP is used.
 993                                  */
 994                                 if (isp_stat & INTR_VBUS_VLD)
 995                                         isp->otg.state = OTG_STATE_A_HOST;
 996                                 break;
 997                         case OTG_STATE_A_WAIT_VFALL:
 998                                 if (!(isp_stat & INTR_SESS_VLD))
 999                                         a_idle(isp, "vfell");
1000                                 break;
1001                         default:
1002                                 if (!(isp_stat & INTR_VBUS_VLD))
1003                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1004                                 break;
1005                         }
1006                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1007                 } else {
1008                         switch (state) {
1009                         case OTG_STATE_B_PERIPHERAL:
1010                         case OTG_STATE_B_HOST:
1011                         case OTG_STATE_B_WAIT_ACON:
1012                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1013                                 break;
1014                         default:
1015                                 break;
1016                         }
1017                         if (state != OTG_STATE_A_IDLE)
1018                                 a_idle(isp, "id");
1019                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1020                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1021                         isp_bstat = 0;
1022                 }
1023         } else {
1024                 u32 l;
1025
1026                 /* if user unplugged mini-A end of cable,
1027                  * don't bypass A_WAIT_VFALL.
1028                  */
1029                 if (isp->otg.default_a) {
1030                         switch (state) {
1031                         default:
1032                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1033                                 break;
1034                         case OTG_STATE_A_WAIT_VFALL:
1035                                 state = OTG_STATE_A_IDLE;
1036                                 /* khubd may take a while to notice and
1037                                  * handle this disconnect, so don't go
1038                                  * to B_IDLE quite yet.
1039                                  */
1040                                 break;
1041                         case OTG_STATE_A_IDLE:
1042                                 host_suspend(isp);
1043                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1044                                                 MC1_BDIS_ACON_EN);
1045                                 isp->otg.state = OTG_STATE_B_IDLE;
1046                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1047                                 l &= ~OTG_CTRL_BITS;
1048                                 omap_writel(l, OTG_CTRL);
1049                                 break;
1050                         case OTG_STATE_B_IDLE:
1051                                 break;
1052                         }
1053                 }
1054                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1055
1056                 switch (isp->otg.state) {
1057                 case OTG_STATE_B_PERIPHERAL:
1058                 case OTG_STATE_B_WAIT_ACON:
1059                 case OTG_STATE_B_HOST:
1060                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1061                                 break;
1062                         enable_vbus_draw(isp, 0);
1063 #ifndef CONFIG_USB_OTG
1064                         /* UDC driver will clear OTG_BSESSVLD */
1065                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1066                                                 OTG1_DP_PULLDOWN);
1067                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1068                                                 OTG1_DP_PULLUP);
1069                         dump_regs(isp, __func__);
1070 #endif
1071                         /* FALLTHROUGH */
1072                 case OTG_STATE_B_SRP_INIT:
1073                         b_idle(isp, __func__);
1074                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1075                         omap_writel(l, OTG_CTRL);
1076                         /* FALLTHROUGH */
1077                 case OTG_STATE_B_IDLE:
1078                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1079 #ifdef  CONFIG_USB_OTG
1080                                 update_otg1(isp, isp_stat);
1081                                 update_otg2(isp, isp_bstat);
1082 #endif
1083                                 b_peripheral(isp);
1084                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1085                                 isp_bstat |= OTG_B_SESS_END;
1086                         break;
1087                 case OTG_STATE_A_WAIT_VFALL:
1088                         break;
1089                 default:
1090                         pr_debug("otg: unsupported b-device %s\n",
1091                                 state_name(isp));
1092                         break;
1093                 }
1094         }
1095
1096         if (state != isp->otg.state)
1097                 pr_debug("  isp, %s -> %s\n",
1098                                 state_string(state), state_name(isp));
1099
1100 #ifdef  CONFIG_USB_OTG
1101         /* update the OTG controller state to match the isp1301; may
1102          * trigger OPRT_CHG irqs for changes going to the isp1301.
1103          */
1104         update_otg1(isp, isp_stat);
1105         update_otg2(isp, isp_bstat);
1106         check_state(isp, __func__);
1107 #endif
1108
1109         dump_regs(isp, "isp1301->otg");
1110 }
1111
1112 /*-------------------------------------------------------------------------*/
1113
1114 static u8 isp1301_clear_latch(struct isp1301 *isp)
1115 {
1116         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1117         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1118         return latch;
1119 }
1120
1121 static void
1122 isp1301_work(struct work_struct *work)
1123 {
1124         struct isp1301  *isp = container_of(work, struct isp1301, work);
1125         int             stop;
1126
1127         /* implicit lock:  we're the only task using this device */
1128         isp->working = 1;
1129         do {
1130                 stop = test_bit(WORK_STOP, &isp->todo);
1131
1132 #ifdef  CONFIG_USB_OTG
1133                 /* transfer state from otg engine to isp1301 */
1134                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1135                         otg_update_isp(isp);
1136                         put_device(&isp->client->dev);
1137                 }
1138 #endif
1139                 /* transfer state from isp1301 to otg engine */
1140                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1141                         u8              stat = isp1301_clear_latch(isp);
1142
1143                         isp_update_otg(isp, stat);
1144                         put_device(&isp->client->dev);
1145                 }
1146
1147                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1148                         u32     otg_ctrl;
1149
1150                         /*
1151                          * skip A_WAIT_VRISE; hc transitions invisibly
1152                          * skip A_WAIT_BCON; same.
1153                          */
1154                         switch (isp->otg.state) {
1155                         case OTG_STATE_A_WAIT_BCON:
1156                         case OTG_STATE_A_WAIT_VRISE:
1157                                 isp->otg.state = OTG_STATE_A_HOST;
1158                                 pr_debug("  --> a_host\n");
1159                                 otg_ctrl = omap_readl(OTG_CTRL);
1160                                 otg_ctrl |= OTG_A_BUSREQ;
1161                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1162                                                 & OTG_CTRL_MASK;
1163                                 omap_writel(otg_ctrl, OTG_CTRL);
1164                                 break;
1165                         case OTG_STATE_B_WAIT_ACON:
1166                                 isp->otg.state = OTG_STATE_B_HOST;
1167                                 pr_debug("  --> b_host (acon)\n");
1168                                 break;
1169                         case OTG_STATE_B_HOST:
1170                         case OTG_STATE_B_IDLE:
1171                         case OTG_STATE_A_IDLE:
1172                                 break;
1173                         default:
1174                                 pr_debug("  host resume in %s\n",
1175                                                 state_name(isp));
1176                         }
1177                         host_resume(isp);
1178                         // mdelay(10);
1179                         put_device(&isp->client->dev);
1180                 }
1181
1182                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1183 #ifdef  VERBOSE
1184                         dump_regs(isp, "timer");
1185                         if (!stop)
1186                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1187 #endif
1188                         put_device(&isp->client->dev);
1189                 }
1190
1191                 if (isp->todo)
1192                         dev_vdbg(&isp->client->dev,
1193                                 "work done, todo = 0x%lx\n",
1194                                 isp->todo);
1195                 if (stop) {
1196                         dev_dbg(&isp->client->dev, "stop\n");
1197                         break;
1198                 }
1199         } while (isp->todo);
1200         isp->working = 0;
1201 }
1202
1203 static irqreturn_t isp1301_irq(int irq, void *isp)
1204 {
1205         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1206         return IRQ_HANDLED;
1207 }
1208
1209 static void isp1301_timer(unsigned long _isp)
1210 {
1211         isp1301_defer_work((void *)_isp, WORK_TIMER);
1212 }
1213
1214 /*-------------------------------------------------------------------------*/
1215
1216 static void isp1301_release(struct device *dev)
1217 {
1218         struct isp1301  *isp;
1219
1220         isp = dev_get_drvdata(dev);
1221
1222         /* FIXME -- not with a "new style" driver, it doesn't!! */
1223
1224         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1225         if (isp->i2c_release)
1226                 isp->i2c_release(dev);
1227         kfree (isp);
1228 }
1229
1230 static struct isp1301 *the_transceiver;
1231
1232 static int __exit isp1301_remove(struct i2c_client *i2c)
1233 {
1234         struct isp1301  *isp;
1235
1236         isp = i2c_get_clientdata(i2c);
1237
1238         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1239         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1240         free_irq(i2c->irq, isp);
1241 #ifdef  CONFIG_USB_OTG
1242         otg_unbind(isp);
1243 #endif
1244         if (machine_is_omap_h2())
1245                 gpio_free(2);
1246
1247         isp->timer.data = 0;
1248         set_bit(WORK_STOP, &isp->todo);
1249         del_timer_sync(&isp->timer);
1250         flush_work_sync(&isp->work);
1251
1252         put_device(&i2c->dev);
1253         the_transceiver = NULL;
1254
1255         return 0;
1256 }
1257
1258 /*-------------------------------------------------------------------------*/
1259
1260 /* NOTE:  three modes are possible here, only one of which
1261  * will be standards-conformant on any given system:
1262  *
1263  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1264  *  - HOST mode, for when there's one or more A (host) connectors
1265  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1266  *
1267  * As a rule, you won't have an isp1301 chip unless it's there to
1268  * support the OTG mode.  Other modes help testing USB controllers
1269  * in isolation from (full) OTG support, or maybe so later board
1270  * revisions can help to support those feature.
1271  */
1272
1273 #ifdef  CONFIG_USB_OTG
1274
1275 static int isp1301_otg_enable(struct isp1301 *isp)
1276 {
1277         power_up(isp);
1278         isp1301_otg_init(isp);
1279
1280         /* NOTE:  since we don't change this, this provides
1281          * a few more interrupts than are strictly needed.
1282          */
1283         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1284                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1285         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1286                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1287
1288         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1289
1290         return 0;
1291 }
1292
1293 #endif
1294
1295 /* add or disable the host device+driver */
1296 static int
1297 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1298 {
1299         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1300
1301         if (!otg || isp != the_transceiver)
1302                 return -ENODEV;
1303
1304         if (!host) {
1305                 omap_writew(0, OTG_IRQ_EN);
1306                 power_down(isp);
1307                 isp->otg.host = NULL;
1308                 return 0;
1309         }
1310
1311 #ifdef  CONFIG_USB_OTG
1312         isp->otg.host = host;
1313         dev_dbg(&isp->client->dev, "registered host\n");
1314         host_suspend(isp);
1315         if (isp->otg.gadget)
1316                 return isp1301_otg_enable(isp);
1317         return 0;
1318
1319 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1320         // FIXME update its refcount
1321         isp->otg.host = host;
1322
1323         power_up(isp);
1324
1325         if (machine_is_omap_h2())
1326                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1327
1328         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1329         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1330                 INTR_ID_GND);
1331         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1332                 INTR_ID_GND);
1333
1334         /* If this has a Mini-AB connector, this mode is highly
1335          * nonstandard ... but can be handy for testing, especially with
1336          * the Mini-A end of an OTG cable.  (Or something nonstandard
1337          * like MiniB-to-StandardB, maybe built with a gender mender.)
1338          */
1339         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1340
1341         dump_regs(isp, __func__);
1342
1343         return 0;
1344
1345 #else
1346         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1347         return -EINVAL;
1348 #endif
1349
1350 }
1351
1352 static int
1353 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1354 {
1355         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1356 #ifndef CONFIG_USB_OTG
1357         u32 l;
1358 #endif
1359
1360         if (!otg || isp != the_transceiver)
1361                 return -ENODEV;
1362
1363         if (!gadget) {
1364                 omap_writew(0, OTG_IRQ_EN);
1365                 if (!isp->otg.default_a)
1366                         enable_vbus_draw(isp, 0);
1367                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1368                 isp->otg.gadget = NULL;
1369                 power_down(isp);
1370                 return 0;
1371         }
1372
1373 #ifdef  CONFIG_USB_OTG
1374         isp->otg.gadget = gadget;
1375         dev_dbg(&isp->client->dev, "registered gadget\n");
1376         /* gadget driver may be suspended until vbus_connect () */
1377         if (isp->otg.host)
1378                 return isp1301_otg_enable(isp);
1379         return 0;
1380
1381 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1382         isp->otg.gadget = gadget;
1383         // FIXME update its refcount
1384
1385         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1386         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1387         l |= OTG_ID;
1388         omap_writel(l, OTG_CTRL);
1389
1390         power_up(isp);
1391         isp->otg.state = OTG_STATE_B_IDLE;
1392
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);
1398         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1399                 INTR_VBUS_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_HOST:
1479                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1480                 /* caller will suspend next */
1481                 break;
1482         case OTG_STATE_A_HOST:
1483 #if 0
1484                 /* autoconnect mode avoids irq latency bugs */
1485                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1486                                 MC1_BDIS_ACON_EN);
1487 #endif
1488                 /* caller must suspend then clear A_BUSREQ */
1489                 usb_gadget_vbus_connect(isp->otg.gadget);
1490                 l = omap_readl(OTG_CTRL);
1491                 l |= OTG_A_SETB_HNPEN;
1492                 omap_writel(l, OTG_CTRL);
1493
1494                 break;
1495         case OTG_STATE_A_PERIPHERAL:
1496                 /* initiated by B-Host suspend */
1497                 break;
1498         default:
1499                 return -EILSEQ;
1500         }
1501         pr_debug("otg: HNP %s, %06x ...\n",
1502                 state_name(isp), omap_readl(OTG_CTRL));
1503         check_state(isp, __func__);
1504         return 0;
1505 #else
1506         /* srp-only */
1507         return -EINVAL;
1508 #endif
1509 }
1510
1511 /*-------------------------------------------------------------------------*/
1512
1513 static int __devinit
1514 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1515 {
1516         int                     status;
1517         struct isp1301          *isp;
1518
1519         if (the_transceiver)
1520                 return 0;
1521
1522         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1523         if (!isp)
1524                 return 0;
1525
1526         INIT_WORK(&isp->work, isp1301_work);
1527         init_timer(&isp->timer);
1528         isp->timer.function = isp1301_timer;
1529         isp->timer.data = (unsigned long) isp;
1530
1531         i2c_set_clientdata(i2c, isp);
1532         isp->client = i2c;
1533
1534         /* verify the chip (shouldn't be necesary) */
1535         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1536         if (status != I2C_VENDOR_ID_PHILIPS) {
1537                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1538                 goto fail;
1539         }
1540         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1541         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1542                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1543                 goto fail;
1544         }
1545         isp->i2c_release = i2c->dev.release;
1546         i2c->dev.release = isp1301_release;
1547
1548         /* initial development used chiprev 2.00 */
1549         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1550         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1551                 status >> 8, status & 0xff);
1552
1553         /* make like power-on reset */
1554         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1555
1556         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1557         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1558
1559         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1560                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1561         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1562                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1563
1564         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1565         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1566         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1567
1568 #ifdef  CONFIG_USB_OTG
1569         status = otg_bind(isp);
1570         if (status < 0) {
1571                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1572                 goto fail;
1573         }
1574 #endif
1575
1576         if (machine_is_omap_h2()) {
1577                 /* full speed signaling by default */
1578                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1579                         MC1_SPEED);
1580                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1581                         MC2_SPD_SUSP_CTRL);
1582
1583                 /* IRQ wired at M14 */
1584                 omap_cfg_reg(M14_1510_GPIO2);
1585                 if (gpio_request(2, "isp1301") == 0)
1586                         gpio_direction_input(2);
1587                 isp->irq_type = IRQF_TRIGGER_FALLING;
1588         }
1589
1590         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1591         status = request_irq(i2c->irq, isp1301_irq,
1592                         isp->irq_type, DRIVER_NAME, isp);
1593         if (status < 0) {
1594                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1595                                 i2c->irq, status);
1596                 goto fail;
1597         }
1598
1599         isp->otg.dev = &i2c->dev;
1600         isp->otg.label = DRIVER_NAME;
1601
1602         isp->otg.set_host = isp1301_set_host,
1603         isp->otg.set_peripheral = isp1301_set_peripheral,
1604         isp->otg.set_power = isp1301_set_power,
1605         isp->otg.start_srp = isp1301_start_srp,
1606         isp->otg.start_hnp = isp1301_start_hnp,
1607
1608         enable_vbus_draw(isp, 0);
1609         power_down(isp);
1610         the_transceiver = isp;
1611
1612 #ifdef  CONFIG_USB_OTG
1613         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1614         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1615 #endif
1616
1617         dump_regs(isp, __func__);
1618
1619 #ifdef  VERBOSE
1620         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1621         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1622 #endif
1623
1624         status = otg_set_transceiver(&isp->otg);
1625         if (status < 0)
1626                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1627                         status);
1628
1629         return 0;
1630
1631 fail:
1632         kfree(isp);
1633         return -ENODEV;
1634 }
1635
1636 static const struct i2c_device_id isp1301_id[] = {
1637         { "isp1301_omap", 0 },
1638         { }
1639 };
1640 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1641
1642 static struct i2c_driver isp1301_driver = {
1643         .driver = {
1644                 .name   = "isp1301_omap",
1645         },
1646         .probe          = isp1301_probe,
1647         .remove         = __exit_p(isp1301_remove),
1648         .id_table       = isp1301_id,
1649 };
1650
1651 /*-------------------------------------------------------------------------*/
1652
1653 static int __init isp_init(void)
1654 {
1655         return i2c_add_driver(&isp1301_driver);
1656 }
1657 subsys_initcall(isp_init);
1658
1659 static void __exit isp_exit(void)
1660 {
1661         if (the_transceiver)
1662                 otg_set_transceiver(NULL);
1663         i2c_del_driver(&isp1301_driver);
1664 }
1665 module_exit(isp_exit);
1666