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 inline const char *state_name(struct isp1301 *isp)
 238 {
 239         return otg_state_string(isp->otg.state);
 240 }
 241
 242 /*-------------------------------------------------------------------------*/
 243
 244 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 245  * not everything is guarded by board-specific checks, or even using
 246  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 247  *
 248  * ALSO:  this currently doesn't use ISP1301 low-power modes
 249  * while OTG is running.
 250  */
 251
 252 static void power_down(struct isp1301 *isp)
 253 {
 254         isp->otg.state = OTG_STATE_UNDEFINED;
 255
 256         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 257         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 258
 259         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 260         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 261 }
 262
 263 static void power_up(struct isp1301 *isp)
 264 {
 265         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 266         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 267
 268         /* do this only when cpu is driving transceiver,
 269          * so host won't see a low speed device...
 270          */
 271         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 272 }
 273
 274 #define NO_HOST_SUSPEND
 275
 276 static int host_suspend(struct isp1301 *isp)
 277 {
 278 #ifdef  NO_HOST_SUSPEND
 279         return 0;
 280 #else
 281         struct device   *dev;
 282
 283         if (!isp->otg.host)
 284                 return -ENODEV;
 285
 286         /* Currently ASSUMES only the OTG port matters;
 287          * other ports could be active...
 288          */
 289         dev = isp->otg.host->controller;
 290         return dev->driver->suspend(dev, 3, 0);
 291 #endif
 292 }
 293
 294 static int host_resume(struct isp1301 *isp)
 295 {
 296 #ifdef  NO_HOST_SUSPEND
 297         return 0;
 298 #else
 299         struct device   *dev;
 300
 301         if (!isp->otg.host)
 302                 return -ENODEV;
 303
 304         dev = isp->otg.host->controller;
 305         return dev->driver->resume(dev, 0);
 306 #endif
 307 }
 308
 309 static int gadget_suspend(struct isp1301 *isp)
 310 {
 311         isp->otg.gadget->b_hnp_enable = 0;
 312         isp->otg.gadget->a_hnp_support = 0;
 313         isp->otg.gadget->a_alt_hnp_support = 0;
 314         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 315 }
 316
 317 /*-------------------------------------------------------------------------*/
 318
 319 #define TIMER_MINUTES   10
 320 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 321
 322 /* Almost all our I2C messaging comes from a work queue's task context.
 323  * NOTE: guaranteeing certain response times might mean we shouldn't
 324  * share keventd's work queue; a realtime task might be safest.
 325  */
 326 static void isp1301_defer_work(struct isp1301 *isp, int work)
 327 {
 328         int status;
 329
 330         if (isp && !test_and_set_bit(work, &isp->todo)) {
 331                 (void) get_device(&isp->client->dev);
 332                 status = schedule_work(&isp->work);
 333                 if (!status && !isp->working)
 334                         dev_vdbg(&isp->client->dev,
 335                                 "work item %d may be lost\n", work);
 336         }
 337 }
 338
 339 /* called from irq handlers */
 340 static void a_idle(struct isp1301 *isp, const char *tag)
 341 {
 342         u32 l;
 343
 344         if (isp->otg.state == OTG_STATE_A_IDLE)
 345                 return;
 346
 347         isp->otg.default_a = 1;
 348         if (isp->otg.host) {
 349                 isp->otg.host->is_b_host = 0;
 350                 host_suspend(isp);
 351         }
 352         if (isp->otg.gadget) {
 353                 isp->otg.gadget->is_a_peripheral = 1;
 354                 gadget_suspend(isp);
 355         }
 356         isp->otg.state = OTG_STATE_A_IDLE;
 357         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 358         omap_writel(l, OTG_CTRL);
 359         isp->last_otg_ctrl = l;
 360         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 361 }
 362
 363 /* called from irq handlers */
 364 static void b_idle(struct isp1301 *isp, const char *tag)
 365 {
 366         u32 l;
 367
 368         if (isp->otg.state == OTG_STATE_B_IDLE)
 369                 return;
 370
 371         isp->otg.default_a = 0;
 372         if (isp->otg.host) {
 373                 isp->otg.host->is_b_host = 1;
 374                 host_suspend(isp);
 375         }
 376         if (isp->otg.gadget) {
 377                 isp->otg.gadget->is_a_peripheral = 0;
 378                 gadget_suspend(isp);
 379         }
 380         isp->otg.state = OTG_STATE_B_IDLE;
 381         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 382         omap_writel(l, OTG_CTRL);
 383         isp->last_otg_ctrl = l;
 384         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 385 }
 386
 387 static void
 388 dump_regs(struct isp1301 *isp, const char *label)
 389 {
 390 #ifdef  DEBUG
 391         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 392         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 393         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 394
 395         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 396                 omap_readl(OTG_CTRL), label, state_name(isp),
 397                 ctrl, status, src);
 398         /* mode control and irq enables don't change much */
 399 #endif
 400 }
 401
 402 /*-------------------------------------------------------------------------*/
 403
 404 #ifdef  CONFIG_USB_OTG
 405
 406 /*
 407  * The OMAP OTG controller handles most of the OTG state transitions.
 408  *
 409  * We translate isp1301 outputs (mostly voltage comparator status) into
 410  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 411  * flags into isp1301 inputs ... and infer state transitions.
 412  */
 413
 414 #ifdef  VERBOSE
 415
 416 static void check_state(struct isp1301 *isp, const char *tag)
 417 {
 418         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 419         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 420         unsigned                extra = 0;
 421
 422         switch (fsm) {
 423
 424         /* default-b */
 425         case 0x0:
 426                 state = OTG_STATE_B_IDLE;
 427                 break;
 428         case 0x3:
 429         case 0x7:
 430                 extra = 1;
 431         case 0x1:
 432                 state = OTG_STATE_B_PERIPHERAL;
 433                 break;
 434         case 0x11:
 435                 state = OTG_STATE_B_SRP_INIT;
 436                 break;
 437
 438         /* extra dual-role default-b states */
 439         case 0x12:
 440         case 0x13:
 441         case 0x16:
 442                 extra = 1;
 443         case 0x17:
 444                 state = OTG_STATE_B_WAIT_ACON;
 445                 break;
 446         case 0x34:
 447                 state = OTG_STATE_B_HOST;
 448                 break;
 449
 450         /* default-a */
 451         case 0x36:
 452                 state = OTG_STATE_A_IDLE;
 453                 break;
 454         case 0x3c:
 455                 state = OTG_STATE_A_WAIT_VFALL;
 456                 break;
 457         case 0x7d:
 458                 state = OTG_STATE_A_VBUS_ERR;
 459                 break;
 460         case 0x9e:
 461         case 0x9f:
 462                 extra = 1;
 463         case 0x89:
 464                 state = OTG_STATE_A_PERIPHERAL;
 465                 break;
 466         case 0xb7:
 467                 state = OTG_STATE_A_WAIT_VRISE;
 468                 break;
 469         case 0xb8:
 470                 state = OTG_STATE_A_WAIT_BCON;
 471                 break;
 472         case 0xb9:
 473                 state = OTG_STATE_A_HOST;
 474                 break;
 475         case 0xba:
 476                 state = OTG_STATE_A_SUSPEND;
 477                 break;
 478         default:
 479                 break;
 480         }
 481         if (isp->otg.state == state && !extra)
 482                 return;
 483         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 484                 otg_state_string(state), fsm, state_name(isp),
 485                 omap_readl(OTG_CTRL));
 486 }
 487
 488 #else
 489
 490 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 491
 492 #endif
 493
 494 /* outputs from ISP1301_INTERRUPT_SOURCE */
 495 static void update_otg1(struct isp1301 *isp, u8 int_src)
 496 {
 497         u32     otg_ctrl;
 498
 499         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 500         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 501         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 502
 503         if (int_src & INTR_SESS_VLD)
 504                 otg_ctrl |= OTG_ASESSVLD;
 505         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 506                 a_idle(isp, "vfall");
 507                 otg_ctrl &= ~OTG_CTRL_BITS;
 508         }
 509         if (int_src & INTR_VBUS_VLD)
 510                 otg_ctrl |= OTG_VBUSVLD;
 511         if (int_src & INTR_ID_GND) {            /* default-A */
 512                 if (isp->otg.state == OTG_STATE_B_IDLE
 513                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 514                         a_idle(isp, "init");
 515                         return;
 516                 }
 517         } else {                                /* default-B */
 518                 otg_ctrl |= OTG_ID;
 519                 if (isp->otg.state == OTG_STATE_A_IDLE
 520                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 521                         b_idle(isp, "init");
 522                         return;
 523                 }
 524         }
 525         omap_writel(otg_ctrl, OTG_CTRL);
 526 }
 527
 528 /* outputs from ISP1301_OTG_STATUS */
 529 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 530 {
 531         u32     otg_ctrl;
 532
 533         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 534         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 535         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 536         if (otg_status & OTG_B_SESS_VLD)
 537                 otg_ctrl |= OTG_BSESSVLD;
 538         else if (otg_status & OTG_B_SESS_END)
 539                 otg_ctrl |= OTG_BSESSEND;
 540         omap_writel(otg_ctrl, OTG_CTRL);
 541 }
 542
 543 /* inputs going to ISP1301 */
 544 static void otg_update_isp(struct isp1301 *isp)
 545 {
 546         u32     otg_ctrl, otg_change;
 547         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 548
 549         otg_ctrl = omap_readl(OTG_CTRL);
 550         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 551         isp->last_otg_ctrl = otg_ctrl;
 552         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 553
 554         switch (isp->otg.state) {
 555         case OTG_STATE_B_IDLE:
 556         case OTG_STATE_B_PERIPHERAL:
 557         case OTG_STATE_B_SRP_INIT:
 558                 if (!(otg_ctrl & OTG_PULLUP)) {
 559                         // if (otg_ctrl & OTG_B_HNPEN) {
 560                         if (isp->otg.gadget->b_hnp_enable) {
 561                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 562                                 pr_debug("  --> b_wait_acon\n");
 563                         }
 564                         goto pulldown;
 565                 }
 566 pullup:
 567                 set |= OTG1_DP_PULLUP;
 568                 clr |= OTG1_DP_PULLDOWN;
 569                 break;
 570         case OTG_STATE_A_SUSPEND:
 571         case OTG_STATE_A_PERIPHERAL:
 572                 if (otg_ctrl & OTG_PULLUP)
 573                         goto pullup;
 574                 /* FALLTHROUGH */
 575         // case OTG_STATE_B_WAIT_ACON:
 576         default:
 577 pulldown:
 578                 set |= OTG1_DP_PULLDOWN;
 579                 clr |= OTG1_DP_PULLUP;
 580                 break;
 581         }
 582
 583 #       define toggle(OTG,ISP) do { \
 584                 if (otg_ctrl & OTG) set |= ISP; \
 585                 else clr |= ISP; \
 586                 } while (0)
 587
 588         if (!(isp->otg.host))
 589                 otg_ctrl &= ~OTG_DRV_VBUS;
 590
 591         switch (isp->otg.state) {
 592         case OTG_STATE_A_SUSPEND:
 593                 if (otg_ctrl & OTG_DRV_VBUS) {
 594                         set |= OTG1_VBUS_DRV;
 595                         break;
 596                 }
 597                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 598                 notresponding(isp);
 599
 600                 /* FALLTHROUGH */
 601         case OTG_STATE_A_VBUS_ERR:
 602                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 603                 pr_debug("  --> a_wait_vfall\n");
 604                 /* FALLTHROUGH */
 605         case OTG_STATE_A_WAIT_VFALL:
 606                 /* FIXME usbcore thinks port power is still on ... */
 607                 clr |= OTG1_VBUS_DRV;
 608                 break;
 609         case OTG_STATE_A_IDLE:
 610                 if (otg_ctrl & OTG_DRV_VBUS) {
 611                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 612                         pr_debug("  --> a_wait_vrise\n");
 613                 }
 614                 /* FALLTHROUGH */
 615         default:
 616                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 617         }
 618
 619         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 620         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 621
 622 #       undef toggle
 623
 624         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 625         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 626
 627         /* HNP switch to host or peripheral; and SRP */
 628         if (otg_change & OTG_PULLUP) {
 629                 u32 l;
 630
 631                 switch (isp->otg.state) {
 632                 case OTG_STATE_B_IDLE:
 633                         if (clr & OTG1_DP_PULLUP)
 634                                 break;
 635                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 636                         pr_debug("  --> b_peripheral\n");
 637                         break;
 638                 case OTG_STATE_A_SUSPEND:
 639                         if (clr & OTG1_DP_PULLUP)
 640                                 break;
 641                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 642                         pr_debug("  --> a_peripheral\n");
 643                         break;
 644                 default:
 645                         break;
 646                 }
 647                 l = omap_readl(OTG_CTRL);
 648                 l |= OTG_PULLUP;
 649                 omap_writel(l, OTG_CTRL);
 650         }
 651
 652         check_state(isp, __func__);
 653         dump_regs(isp, "otg->isp1301");
 654 }
 655
 656 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 657 {
 658         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 659         u32             otg_ctrl;
 660         int             ret = IRQ_NONE;
 661         struct isp1301  *isp = _isp;
 662
 663         /* update ISP1301 transceiver from OTG controller */
 664         if (otg_irq & OPRT_CHG) {
 665                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 666                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 667                 ret = IRQ_HANDLED;
 668
 669         /* SRP to become b_peripheral failed */
 670         } else if (otg_irq & B_SRP_TMROUT) {
 671                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 672                 notresponding(isp);
 673
 674                 /* gadget drivers that care should monitor all kinds of
 675                  * remote wakeup (SRP, normal) using their own timer
 676                  * to give "check cable and A-device" messages.
 677                  */
 678                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 679                         b_idle(isp, "srp_timeout");
 680
 681                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 682                 ret = IRQ_HANDLED;
 683
 684         /* HNP to become b_host failed */
 685         } else if (otg_irq & B_HNP_FAIL) {
 686                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 687                                 state_name(isp), omap_readl(OTG_CTRL));
 688                 notresponding(isp);
 689
 690                 otg_ctrl = omap_readl(OTG_CTRL);
 691                 otg_ctrl |= OTG_BUSDROP;
 692                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 693                 omap_writel(otg_ctrl, OTG_CTRL);
 694
 695                 /* subset of b_peripheral()... */
 696                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 697                 pr_debug("  --> b_peripheral\n");
 698
 699                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 700                 ret = IRQ_HANDLED;
 701
 702         /* detect SRP from B-device ... */
 703         } else if (otg_irq & A_SRP_DETECT) {
 704                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 705                                 state_name(isp), omap_readl(OTG_CTRL));
 706
 707                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 708                 switch (isp->otg.state) {
 709                 case OTG_STATE_A_IDLE:
 710                         if (!isp->otg.host)
 711                                 break;
 712                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 713                         otg_ctrl = omap_readl(OTG_CTRL);
 714                         otg_ctrl |= OTG_A_BUSREQ;
 715                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 716                                         & ~OTG_XCEIV_INPUTS
 717                                         & OTG_CTRL_MASK;
 718                         omap_writel(otg_ctrl, OTG_CTRL);
 719                         break;
 720                 default:
 721                         break;
 722                 }
 723
 724                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 725                 ret = IRQ_HANDLED;
 726
 727         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 728          * we don't track them separately
 729          */
 730         } else if (otg_irq & A_REQ_TMROUT) {
 731                 otg_ctrl = omap_readl(OTG_CTRL);
 732                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 733                                 state_name(isp), otg_ctrl);
 734                 notresponding(isp);
 735
 736                 otg_ctrl |= OTG_BUSDROP;
 737                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 738                 omap_writel(otg_ctrl, OTG_CTRL);
 739                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 740
 741                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 742                 ret = IRQ_HANDLED;
 743
 744         /* A-supplied voltage fell too low; overcurrent */
 745         } else if (otg_irq & A_VBUS_ERR) {
 746                 otg_ctrl = omap_readl(OTG_CTRL);
 747                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 748                         state_name(isp), otg_irq, otg_ctrl);
 749
 750                 otg_ctrl |= OTG_BUSDROP;
 751                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 752                 omap_writel(otg_ctrl, OTG_CTRL);
 753                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 754
 755                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 756                 ret = IRQ_HANDLED;
 757
 758         /* switch driver; the transceiver code activates it,
 759          * ungating the udc clock or resuming OHCI.
 760          */
 761         } else if (otg_irq & DRIVER_SWITCH) {
 762                 int     kick = 0;
 763
 764                 otg_ctrl = omap_readl(OTG_CTRL);
 765                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 766                                 state_name(isp),
 767                                 (otg_ctrl & OTG_DRIVER_SEL)
 768                                         ? "gadget" : "host",
 769                                 otg_ctrl);
 770                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 771
 772                 /* role is peripheral */
 773                 if (otg_ctrl & OTG_DRIVER_SEL) {
 774                         switch (isp->otg.state) {
 775                         case OTG_STATE_A_IDLE:
 776                                 b_idle(isp, __func__);
 777                                 break;
 778                         default:
 779                                 break;
 780                         }
 781                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 782
 783                 /* role is host */
 784                 } else {
 785                         if (!(otg_ctrl & OTG_ID)) {
 786                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 787                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 788                         }
 789
 790                         if (isp->otg.host) {
 791                                 switch (isp->otg.state) {
 792                                 case OTG_STATE_B_WAIT_ACON:
 793                                         isp->otg.state = OTG_STATE_B_HOST;
 794                                         pr_debug("  --> b_host\n");
 795                                         kick = 1;
 796                                         break;
 797                                 case OTG_STATE_A_WAIT_BCON:
 798                                         isp->otg.state = OTG_STATE_A_HOST;
 799                                         pr_debug("  --> a_host\n");
 800                                         break;
 801                                 case OTG_STATE_A_PERIPHERAL:
 802                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 803                                         pr_debug("  --> a_wait_bcon\n");
 804                                         break;
 805                                 default:
 806                                         break;
 807                                 }
 808                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 809                         }
 810                 }
 811
 812                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 813                 ret = IRQ_HANDLED;
 814
 815                 if (kick)
 816                         usb_bus_start_enum(isp->otg.host,
 817                                                 isp->otg.host->otg_port);
 818         }
 819
 820         check_state(isp, __func__);
 821         return ret;
 822 }
 823
 824 static struct platform_device *otg_dev;
 825
 826 static int isp1301_otg_init(struct isp1301 *isp)
 827 {
 828         u32 l;
 829
 830         if (!otg_dev)
 831                 return -ENODEV;
 832
 833         dump_regs(isp, __func__);
 834         /* some of these values are board-specific... */
 835         l = omap_readl(OTG_SYSCON_2);
 836         l |= OTG_EN
 837                 /* for B-device: */
 838                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 839                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 840                 // | (3 << 24)          /* 2msec VBUS pulse */
 841                 /* for A-device: */
 842                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 843                 | SRP_DPW               /* detect 167+ns SRP pulses */
 844                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 845                 ;
 846         omap_writel(l, OTG_SYSCON_2);
 847
 848         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 849         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 850
 851         check_state(isp, __func__);
 852         pr_debug("otg: %s, %s %06x\n",
 853                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 854
 855         omap_writew(DRIVER_SWITCH | OPRT_CHG
 856                         | B_SRP_TMROUT | B_HNP_FAIL
 857                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 858
 859         l = omap_readl(OTG_SYSCON_2);
 860         l |= OTG_EN;
 861         omap_writel(l, OTG_SYSCON_2);
 862
 863         return 0;
 864 }
 865
 866 static int otg_probe(struct platform_device *dev)
 867 {
 868         // struct omap_usb_config *config = dev->platform_data;
 869
 870         otg_dev = dev;
 871         return 0;
 872 }
 873
 874 static int otg_remove(struct platform_device *dev)
 875 {
 876         otg_dev = NULL;
 877         return 0;
 878 }
 879
 880 static struct platform_driver omap_otg_driver = {
 881         .probe          = otg_probe,
 882         .remove         = otg_remove,
 883         .driver         = {
 884                 .owner  = THIS_MODULE,
 885                 .name   = "omap_otg",
 886         },
 887 };
 888
 889 static int otg_bind(struct isp1301 *isp)
 890 {
 891         int     status;
 892
 893         if (otg_dev)
 894                 return -EBUSY;
 895
 896         status = platform_driver_register(&omap_otg_driver);
 897         if (status < 0)
 898                 return status;
 899
 900         if (otg_dev)
 901                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 902                                 0, DRIVER_NAME, isp);
 903         else
 904                 status = -ENODEV;
 905
 906         if (status < 0)
 907                 platform_driver_unregister(&omap_otg_driver);
 908         return status;
 909 }
 910
 911 static void otg_unbind(struct isp1301 *isp)
 912 {
 913         if (!otg_dev)
 914                 return;
 915         free_irq(otg_dev->resource[1].start, isp);
 916 }
 917
 918 #else
 919
 920 /* OTG controller isn't clocked */
 921
 922 #endif  /* CONFIG_USB_OTG */
 923
 924 /*-------------------------------------------------------------------------*/
 925
 926 static void b_peripheral(struct isp1301 *isp)
 927 {
 928         u32 l;
 929
 930         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 931         omap_writel(l, OTG_CTRL);
 932
 933         usb_gadget_vbus_connect(isp->otg.gadget);
 934
 935 #ifdef  CONFIG_USB_OTG
 936         enable_vbus_draw(isp, 8);
 937         otg_update_isp(isp);
 938 #else
 939         enable_vbus_draw(isp, 100);
 940         /* UDC driver just set OTG_BSESSVLD */
 941         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 942         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 943         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 944         pr_debug("  --> b_peripheral\n");
 945         dump_regs(isp, "2periph");
 946 #endif
 947 }
 948
 949 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 950 {
 951         u8                      isp_stat, isp_bstat;
 952         enum usb_otg_state      state = isp->otg.state;
 953
 954         if (stat & INTR_BDIS_ACON)
 955                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 956
 957         /* start certain state transitions right away */
 958         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 959         if (isp_stat & INTR_ID_GND) {
 960                 if (isp->otg.default_a) {
 961                         switch (state) {
 962                         case OTG_STATE_B_IDLE:
 963                                 a_idle(isp, "idle");
 964                                 /* FALLTHROUGH */
 965                         case OTG_STATE_A_IDLE:
 966                                 enable_vbus_source(isp);
 967                                 /* FALLTHROUGH */
 968                         case OTG_STATE_A_WAIT_VRISE:
 969                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 970                                  * the HC will transition to A_HOST (or
 971                                  * A_SUSPEND!) without our noticing except
 972                                  * when HNP is used.
 973                                  */
 974                                 if (isp_stat & INTR_VBUS_VLD)
 975                                         isp->otg.state = OTG_STATE_A_HOST;
 976                                 break;
 977                         case OTG_STATE_A_WAIT_VFALL:
 978                                 if (!(isp_stat & INTR_SESS_VLD))
 979                                         a_idle(isp, "vfell");
 980                                 break;
 981                         default:
 982                                 if (!(isp_stat & INTR_VBUS_VLD))
 983                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
 984                                 break;
 985                         }
 986                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 987                 } else {
 988                         switch (state) {
 989                         case OTG_STATE_B_PERIPHERAL:
 990                         case OTG_STATE_B_HOST:
 991                         case OTG_STATE_B_WAIT_ACON:
 992                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
 993                                 break;
 994                         default:
 995                                 break;
 996                         }
 997                         if (state != OTG_STATE_A_IDLE)
 998                                 a_idle(isp, "id");
 999                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1000                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1001                         isp_bstat = 0;
1002                 }
1003         } else {
1004                 u32 l;
1005
1006                 /* if user unplugged mini-A end of cable,
1007                  * don't bypass A_WAIT_VFALL.
1008                  */
1009                 if (isp->otg.default_a) {
1010                         switch (state) {
1011                         default:
1012                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1013                                 break;
1014                         case OTG_STATE_A_WAIT_VFALL:
1015                                 state = OTG_STATE_A_IDLE;
1016                                 /* khubd may take a while to notice and
1017                                  * handle this disconnect, so don't go
1018                                  * to B_IDLE quite yet.
1019                                  */
1020                                 break;
1021                         case OTG_STATE_A_IDLE:
1022                                 host_suspend(isp);
1023                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1024                                                 MC1_BDIS_ACON_EN);
1025                                 isp->otg.state = OTG_STATE_B_IDLE;
1026                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1027                                 l &= ~OTG_CTRL_BITS;
1028                                 omap_writel(l, OTG_CTRL);
1029                                 break;
1030                         case OTG_STATE_B_IDLE:
1031                                 break;
1032                         }
1033                 }
1034                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1035
1036                 switch (isp->otg.state) {
1037                 case OTG_STATE_B_PERIPHERAL:
1038                 case OTG_STATE_B_WAIT_ACON:
1039                 case OTG_STATE_B_HOST:
1040                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1041                                 break;
1042                         enable_vbus_draw(isp, 0);
1043 #ifndef CONFIG_USB_OTG
1044                         /* UDC driver will clear OTG_BSESSVLD */
1045                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1046                                                 OTG1_DP_PULLDOWN);
1047                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1048                                                 OTG1_DP_PULLUP);
1049                         dump_regs(isp, __func__);
1050 #endif
1051                         /* FALLTHROUGH */
1052                 case OTG_STATE_B_SRP_INIT:
1053                         b_idle(isp, __func__);
1054                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1055                         omap_writel(l, OTG_CTRL);
1056                         /* FALLTHROUGH */
1057                 case OTG_STATE_B_IDLE:
1058                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1059 #ifdef  CONFIG_USB_OTG
1060                                 update_otg1(isp, isp_stat);
1061                                 update_otg2(isp, isp_bstat);
1062 #endif
1063                                 b_peripheral(isp);
1064                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1065                                 isp_bstat |= OTG_B_SESS_END;
1066                         break;
1067                 case OTG_STATE_A_WAIT_VFALL:
1068                         break;
1069                 default:
1070                         pr_debug("otg: unsupported b-device %s\n",
1071                                 state_name(isp));
1072                         break;
1073                 }
1074         }
1075
1076         if (state != isp->otg.state)
1077                 pr_debug("  isp, %s -> %s\n",
1078                                 otg_state_string(state), state_name(isp));
1079
1080 #ifdef  CONFIG_USB_OTG
1081         /* update the OTG controller state to match the isp1301; may
1082          * trigger OPRT_CHG irqs for changes going to the isp1301.
1083          */
1084         update_otg1(isp, isp_stat);
1085         update_otg2(isp, isp_bstat);
1086         check_state(isp, __func__);
1087 #endif
1088
1089         dump_regs(isp, "isp1301->otg");
1090 }
1091
1092 /*-------------------------------------------------------------------------*/
1093
1094 static u8 isp1301_clear_latch(struct isp1301 *isp)
1095 {
1096         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1097         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1098         return latch;
1099 }
1100
1101 static void
1102 isp1301_work(struct work_struct *work)
1103 {
1104         struct isp1301  *isp = container_of(work, struct isp1301, work);
1105         int             stop;
1106
1107         /* implicit lock:  we're the only task using this device */
1108         isp->working = 1;
1109         do {
1110                 stop = test_bit(WORK_STOP, &isp->todo);
1111
1112 #ifdef  CONFIG_USB_OTG
1113                 /* transfer state from otg engine to isp1301 */
1114                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1115                         otg_update_isp(isp);
1116                         put_device(&isp->client->dev);
1117                 }
1118 #endif
1119                 /* transfer state from isp1301 to otg engine */
1120                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1121                         u8              stat = isp1301_clear_latch(isp);
1122
1123                         isp_update_otg(isp, stat);
1124                         put_device(&isp->client->dev);
1125                 }
1126
1127                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1128                         u32     otg_ctrl;
1129
1130                         /*
1131                          * skip A_WAIT_VRISE; hc transitions invisibly
1132                          * skip A_WAIT_BCON; same.
1133                          */
1134                         switch (isp->otg.state) {
1135                         case OTG_STATE_A_WAIT_BCON:
1136                         case OTG_STATE_A_WAIT_VRISE:
1137                                 isp->otg.state = OTG_STATE_A_HOST;
1138                                 pr_debug("  --> a_host\n");
1139                                 otg_ctrl = omap_readl(OTG_CTRL);
1140                                 otg_ctrl |= OTG_A_BUSREQ;
1141                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1142                                                 & OTG_CTRL_MASK;
1143                                 omap_writel(otg_ctrl, OTG_CTRL);
1144                                 break;
1145                         case OTG_STATE_B_WAIT_ACON:
1146                                 isp->otg.state = OTG_STATE_B_HOST;
1147                                 pr_debug("  --> b_host (acon)\n");
1148                                 break;
1149                         case OTG_STATE_B_HOST:
1150                         case OTG_STATE_B_IDLE:
1151                         case OTG_STATE_A_IDLE:
1152                                 break;
1153                         default:
1154                                 pr_debug("  host resume in %s\n",
1155                                                 state_name(isp));
1156                         }
1157                         host_resume(isp);
1158                         // mdelay(10);
1159                         put_device(&isp->client->dev);
1160                 }
1161
1162                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1163 #ifdef  VERBOSE
1164                         dump_regs(isp, "timer");
1165                         if (!stop)
1166                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1167 #endif
1168                         put_device(&isp->client->dev);
1169                 }
1170
1171                 if (isp->todo)
1172                         dev_vdbg(&isp->client->dev,
1173                                 "work done, todo = 0x%lx\n",
1174                                 isp->todo);
1175                 if (stop) {
1176                         dev_dbg(&isp->client->dev, "stop\n");
1177                         break;
1178                 }
1179         } while (isp->todo);
1180         isp->working = 0;
1181 }
1182
1183 static irqreturn_t isp1301_irq(int irq, void *isp)
1184 {
1185         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1186         return IRQ_HANDLED;
1187 }
1188
1189 static void isp1301_timer(unsigned long _isp)
1190 {
1191         isp1301_defer_work((void *)_isp, WORK_TIMER);
1192 }
1193
1194 /*-------------------------------------------------------------------------*/
1195
1196 static void isp1301_release(struct device *dev)
1197 {
1198         struct isp1301  *isp;
1199
1200         isp = dev_get_drvdata(dev);
1201
1202         /* FIXME -- not with a "new style" driver, it doesn't!! */
1203
1204         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1205         if (isp->i2c_release)
1206                 isp->i2c_release(dev);
1207         kfree (isp);
1208 }
1209
1210 static struct isp1301 *the_transceiver;
1211
1212 static int __exit isp1301_remove(struct i2c_client *i2c)
1213 {
1214         struct isp1301  *isp;
1215
1216         isp = i2c_get_clientdata(i2c);
1217
1218         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1219         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1220         free_irq(i2c->irq, isp);
1221 #ifdef  CONFIG_USB_OTG
1222         otg_unbind(isp);
1223 #endif
1224         if (machine_is_omap_h2())
1225                 gpio_free(2);
1226
1227         isp->timer.data = 0;
1228         set_bit(WORK_STOP, &isp->todo);
1229         del_timer_sync(&isp->timer);
1230         flush_work_sync(&isp->work);
1231
1232         put_device(&i2c->dev);
1233         the_transceiver = NULL;
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         isp1301_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                 omap_writew(0, OTG_IRQ_EN);
1286                 power_down(isp);
1287                 isp->otg.host = NULL;
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         if (machine_is_omap_h2())
1306                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1307
1308         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1309         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1310                 INTR_ID_GND);
1311         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1312                 INTR_ID_GND);
1313
1314         /* If this has a Mini-AB connector, this mode is highly
1315          * nonstandard ... but can be handy for testing, especially with
1316          * the Mini-A end of an OTG cable.  (Or something nonstandard
1317          * like MiniB-to-StandardB, maybe built with a gender mender.)
1318          */
1319         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1320
1321         dump_regs(isp, __func__);
1322
1323         return 0;
1324
1325 #else
1326         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1327         return -EINVAL;
1328 #endif
1329
1330 }
1331
1332 static int
1333 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1334 {
1335         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1336 #ifndef CONFIG_USB_OTG
1337         u32 l;
1338 #endif
1339
1340         if (!otg || isp != the_transceiver)
1341                 return -ENODEV;
1342
1343         if (!gadget) {
1344                 omap_writew(0, OTG_IRQ_EN);
1345                 if (!isp->otg.default_a)
1346                         enable_vbus_draw(isp, 0);
1347                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1348                 isp->otg.gadget = NULL;
1349                 power_down(isp);
1350                 return 0;
1351         }
1352
1353 #ifdef  CONFIG_USB_OTG
1354         isp->otg.gadget = gadget;
1355         dev_dbg(&isp->client->dev, "registered gadget\n");
1356         /* gadget driver may be suspended until vbus_connect () */
1357         if (isp->otg.host)
1358                 return isp1301_otg_enable(isp);
1359         return 0;
1360
1361 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1362         isp->otg.gadget = gadget;
1363         // FIXME update its refcount
1364
1365         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1366         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1367         l |= OTG_ID;
1368         omap_writel(l, OTG_CTRL);
1369
1370         power_up(isp);
1371         isp->otg.state = OTG_STATE_B_IDLE;
1372
1373         if (machine_is_omap_h2() || machine_is_omap_h3())
1374                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1375
1376         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1377                 INTR_SESS_VLD);
1378         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1379                 INTR_VBUS_VLD);
1380         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1381         dump_regs(isp, __func__);
1382
1383         /* If this has a Mini-AB connector, this mode is highly
1384          * nonstandard ... but can be handy for testing, so long
1385          * as you don't plug a Mini-A cable into the jack.
1386          */
1387         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1388                 b_peripheral(isp);
1389
1390         return 0;
1391
1392 #else
1393         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1394         return -EINVAL;
1395 #endif
1396 }
1397
1398
1399 /*-------------------------------------------------------------------------*/
1400
1401 static int
1402 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1403 {
1404         if (!the_transceiver)
1405                 return -ENODEV;
1406         if (dev->state == OTG_STATE_B_PERIPHERAL)
1407                 enable_vbus_draw(the_transceiver, mA);
1408         return 0;
1409 }
1410
1411 static int
1412 isp1301_start_srp(struct otg_transceiver *dev)
1413 {
1414         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1415         u32             otg_ctrl;
1416
1417         if (!dev || isp != the_transceiver
1418                         || isp->otg.state != OTG_STATE_B_IDLE)
1419                 return -ENODEV;
1420
1421         otg_ctrl = omap_readl(OTG_CTRL);
1422         if (!(otg_ctrl & OTG_BSESSEND))
1423                 return -EINVAL;
1424
1425         otg_ctrl |= OTG_B_BUSREQ;
1426         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1427         omap_writel(otg_ctrl, OTG_CTRL);
1428         isp->otg.state = OTG_STATE_B_SRP_INIT;
1429
1430         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1431                         omap_readl(OTG_CTRL));
1432 #ifdef  CONFIG_USB_OTG
1433         check_state(isp, __func__);
1434 #endif
1435         return 0;
1436 }
1437
1438 static int
1439 isp1301_start_hnp(struct otg_transceiver *dev)
1440 {
1441 #ifdef  CONFIG_USB_OTG
1442         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1443         u32 l;
1444
1445         if (!dev || isp != the_transceiver)
1446                 return -ENODEV;
1447         if (isp->otg.default_a && (isp->otg.host == NULL
1448                         || !isp->otg.host->b_hnp_enable))
1449                 return -ENOTCONN;
1450         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1451                         || !isp->otg.gadget->b_hnp_enable))
1452                 return -ENOTCONN;
1453
1454         /* We want hardware to manage most HNP protocol timings.
1455          * So do this part as early as possible...
1456          */
1457         switch (isp->otg.state) {
1458         case OTG_STATE_B_HOST:
1459                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1460                 /* caller will suspend next */
1461                 break;
1462         case OTG_STATE_A_HOST:
1463 #if 0
1464                 /* autoconnect mode avoids irq latency bugs */
1465                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1466                                 MC1_BDIS_ACON_EN);
1467 #endif
1468                 /* caller must suspend then clear A_BUSREQ */
1469                 usb_gadget_vbus_connect(isp->otg.gadget);
1470                 l = omap_readl(OTG_CTRL);
1471                 l |= OTG_A_SETB_HNPEN;
1472                 omap_writel(l, OTG_CTRL);
1473
1474                 break;
1475         case OTG_STATE_A_PERIPHERAL:
1476                 /* initiated by B-Host suspend */
1477                 break;
1478         default:
1479                 return -EILSEQ;
1480         }
1481         pr_debug("otg: HNP %s, %06x ...\n",
1482                 state_name(isp), omap_readl(OTG_CTRL));
1483         check_state(isp, __func__);
1484         return 0;
1485 #else
1486         /* srp-only */
1487         return -EINVAL;
1488 #endif
1489 }
1490
1491 /*-------------------------------------------------------------------------*/
1492
1493 static int __devinit
1494 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1495 {
1496         int                     status;
1497         struct isp1301          *isp;
1498
1499         if (the_transceiver)
1500                 return 0;
1501
1502         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1503         if (!isp)
1504                 return 0;
1505
1506         INIT_WORK(&isp->work, isp1301_work);
1507         init_timer(&isp->timer);
1508         isp->timer.function = isp1301_timer;
1509         isp->timer.data = (unsigned long) isp;
1510
1511         i2c_set_clientdata(i2c, isp);
1512         isp->client = i2c;
1513
1514         /* verify the chip (shouldn't be necessary) */
1515         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1516         if (status != I2C_VENDOR_ID_PHILIPS) {
1517                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1518                 goto fail;
1519         }
1520         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1521         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1522                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1523                 goto fail;
1524         }
1525         isp->i2c_release = i2c->dev.release;
1526         i2c->dev.release = isp1301_release;
1527
1528         /* initial development used chiprev 2.00 */
1529         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1530         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1531                 status >> 8, status & 0xff);
1532
1533         /* make like power-on reset */
1534         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1535
1536         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1537         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1538
1539         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1540                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1541         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1542                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1543
1544         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1545         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1546         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1547
1548 #ifdef  CONFIG_USB_OTG
1549         status = otg_bind(isp);
1550         if (status < 0) {
1551                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1552                 goto fail;
1553         }
1554 #endif
1555
1556         if (machine_is_omap_h2()) {
1557                 /* full speed signaling by default */
1558                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1559                         MC1_SPEED);
1560                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1561                         MC2_SPD_SUSP_CTRL);
1562
1563                 /* IRQ wired at M14 */
1564                 omap_cfg_reg(M14_1510_GPIO2);
1565                 if (gpio_request(2, "isp1301") == 0)
1566                         gpio_direction_input(2);
1567                 isp->irq_type = IRQF_TRIGGER_FALLING;
1568         }
1569
1570         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1571         status = request_irq(i2c->irq, isp1301_irq,
1572                         isp->irq_type, DRIVER_NAME, isp);
1573         if (status < 0) {
1574                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1575                                 i2c->irq, status);
1576                 goto fail;
1577         }
1578
1579         isp->otg.dev = &i2c->dev;
1580         isp->otg.label = DRIVER_NAME;
1581
1582         isp->otg.set_host = isp1301_set_host,
1583         isp->otg.set_peripheral = isp1301_set_peripheral,
1584         isp->otg.set_power = isp1301_set_power,
1585         isp->otg.start_srp = isp1301_start_srp,
1586         isp->otg.start_hnp = isp1301_start_hnp,
1587
1588         enable_vbus_draw(isp, 0);
1589         power_down(isp);
1590         the_transceiver = isp;
1591
1592 #ifdef  CONFIG_USB_OTG
1593         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1594         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1595 #endif
1596
1597         dump_regs(isp, __func__);
1598
1599 #ifdef  VERBOSE
1600         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1601         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1602 #endif
1603
1604         status = otg_set_transceiver(&isp->otg);
1605         if (status < 0)
1606                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1607                         status);
1608
1609         return 0;
1610
1611 fail:
1612         kfree(isp);
1613         return -ENODEV;
1614 }
1615
1616 static const struct i2c_device_id isp1301_id[] = {
1617         { "isp1301_omap", 0 },
1618         { }
1619 };
1620 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1621
1622 static struct i2c_driver isp1301_driver = {
1623         .driver = {
1624                 .name   = "isp1301_omap",
1625         },
1626         .probe          = isp1301_probe,
1627         .remove         = __exit_p(isp1301_remove),
1628         .id_table       = isp1301_id,
1629 };
1630
1631 /*-------------------------------------------------------------------------*/
1632
1633 static int __init isp_init(void)
1634 {
1635         return i2c_add_driver(&isp1301_driver);
1636 }
1637 subsys_initcall(isp_init);
1638
1639 static void __exit isp_exit(void)
1640 {
1641         if (the_transceiver)
1642                 otg_set_transceiver(NULL);
1643         i2c_del_driver(&isp1301_driver);
1644 }
1645 module_exit(isp_exit);
1646