drivers/i2c/chips/isp1301_omap.c

   1 /*
   2  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004 Texas Instruments
   5  * Copyright (C) 2004 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/usb/ch9.h>
  29 #include <linux/usb/gadget.h>
  30 #include <linux/usb.h>
  31 #include <linux/usb/otg.h>
  32 #include <linux/i2c.h>
  33 #include <linux/workqueue.h>
  34
  35 #include <asm/irq.h>
  36 #include <asm/arch/usb.h>
  37
  38
  39 #ifndef DEBUG
  40 #undef  VERBOSE
  41 #endif
  42
  43
  44 #define DRIVER_VERSION  "24 August 2004"
  45 #define DRIVER_NAME     (isp1301_driver.driver.name)
  46
  47 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  48 MODULE_LICENSE("GPL");
  49
  50 struct isp1301 {
  51         struct otg_transceiver  otg;
  52         struct i2c_client       client;
  53         void                    (*i2c_release)(struct device *dev);
  54
  55         int                     irq;
  56         int                     irq_type;
  57
  58         u32                     last_otg_ctrl;
  59         unsigned                working:1;
  60
  61         struct timer_list       timer;
  62
  63         /* use keventd context to change the state for us */
  64         struct work_struct      work;
  65
  66         unsigned long           todo;
  67 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  68 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  69 #               define WORK_HOST_RESUME 4       /* resume host */
  70 #               define WORK_TIMER       6       /* timer fired */
  71 #               define WORK_STOP        7       /* don't resubmit */
  72 };
  73
  74
  75 /* bits in OTG_CTRL */
  76
  77 #define OTG_XCEIV_OUTPUTS \
  78         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  79 #define OTG_XCEIV_INPUTS \
  80         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  81 #define OTG_CTRL_BITS \
  82         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  83         /* and OTG_PULLUP is sometimes written */
  84
  85 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  86         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  87         OTG_CTRL_BITS)
  88
  89
  90 /*-------------------------------------------------------------------------*/
  91
  92 #ifdef  CONFIG_MACH_OMAP_H2
  93
  94 /* board-specific PM hooks */
  95
  96 #include <asm/gpio.h>
  97 #include <asm/arch/mux.h>
  98 #include <asm/mach-types.h>
  99
 100
 101 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 102
 103 #include <linux/i2c/tps65010.h>
 104
 105 #else
 106
 107 static inline int tps65010_set_vbus_draw(unsigned mA)
 108 {
 109         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 110         return 0;
 111 }
 112
 113 #endif
 114
 115 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 116 {
 117         int status = tps65010_set_vbus_draw(mA);
 118         if (status < 0)
 119                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 120 }
 121
 122 static void enable_vbus_source(struct isp1301 *isp)
 123 {
 124         /* this board won't supply more than 8mA vbus power.
 125          * some boards can switch a 100ma "unit load" (or more).
 126          */
 127 }
 128
 129
 130 /* products will deliver OTG messages with LEDs, GUI, etc */
 131 static inline void notresponding(struct isp1301 *isp)
 132 {
 133         printk(KERN_NOTICE "OTG device not responding.\n");
 134 }
 135
 136
 137 #endif
 138
 139 /*-------------------------------------------------------------------------*/
 140
 141 /* only two addresses possible */
 142 #define ISP_BASE                0x2c
 143 static unsigned short normal_i2c[] = {
 144         ISP_BASE, ISP_BASE + 1,
 145         I2C_CLIENT_END };
 146
 147 I2C_CLIENT_INSMOD;
 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 void
 347 isp1301_defer_work(struct isp1301 *isp, int work)
 348 {
 349         int status;
 350
 351         if (isp && !test_and_set_bit(work, &isp->todo)) {
 352                 (void) get_device(&isp->client.dev);
 353                 status = schedule_work(&isp->work);
 354                 if (!status && !isp->working)
 355                         dev_vdbg(&isp->client.dev,
 356                                 "work item %d may be lost\n", work);
 357         }
 358 }
 359
 360 /* called from irq handlers */
 361 static void a_idle(struct isp1301 *isp, const char *tag)
 362 {
 363         u32 l;
 364
 365         if (isp->otg.state == OTG_STATE_A_IDLE)
 366                 return;
 367
 368         isp->otg.default_a = 1;
 369         if (isp->otg.host) {
 370                 isp->otg.host->is_b_host = 0;
 371                 host_suspend(isp);
 372         }
 373         if (isp->otg.gadget) {
 374                 isp->otg.gadget->is_a_peripheral = 1;
 375                 gadget_suspend(isp);
 376         }
 377         isp->otg.state = OTG_STATE_A_IDLE;
 378         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 379         omap_writel(l, OTG_CTRL);
 380         isp->last_otg_ctrl = l;
 381         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 382 }
 383
 384 /* called from irq handlers */
 385 static void b_idle(struct isp1301 *isp, const char *tag)
 386 {
 387         u32 l;
 388
 389         if (isp->otg.state == OTG_STATE_B_IDLE)
 390                 return;
 391
 392         isp->otg.default_a = 0;
 393         if (isp->otg.host) {
 394                 isp->otg.host->is_b_host = 1;
 395                 host_suspend(isp);
 396         }
 397         if (isp->otg.gadget) {
 398                 isp->otg.gadget->is_a_peripheral = 0;
 399                 gadget_suspend(isp);
 400         }
 401         isp->otg.state = OTG_STATE_B_IDLE;
 402         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 403         omap_writel(l, OTG_CTRL);
 404         isp->last_otg_ctrl = l;
 405         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 406 }
 407
 408 static void
 409 dump_regs(struct isp1301 *isp, const char *label)
 410 {
 411 #ifdef  DEBUG
 412         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 413         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 414         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 415
 416         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 417                 omap_readl(OTG_CTRL), label, state_name(isp),
 418                 ctrl, status, src);
 419         /* mode control and irq enables don't change much */
 420 #endif
 421 }
 422
 423 /*-------------------------------------------------------------------------*/
 424
 425 #ifdef  CONFIG_USB_OTG
 426
 427 /*
 428  * The OMAP OTG controller handles most of the OTG state transitions.
 429  *
 430  * We translate isp1301 outputs (mostly voltage comparator status) into
 431  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 432  * flags into isp1301 inputs ... and infer state transitions.
 433  */
 434
 435 #ifdef  VERBOSE
 436
 437 static void check_state(struct isp1301 *isp, const char *tag)
 438 {
 439         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 440         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 441         unsigned                extra = 0;
 442
 443         switch (fsm) {
 444
 445         /* default-b */
 446         case 0x0:
 447                 state = OTG_STATE_B_IDLE;
 448                 break;
 449         case 0x3:
 450         case 0x7:
 451                 extra = 1;
 452         case 0x1:
 453                 state = OTG_STATE_B_PERIPHERAL;
 454                 break;
 455         case 0x11:
 456                 state = OTG_STATE_B_SRP_INIT;
 457                 break;
 458
 459         /* extra dual-role default-b states */
 460         case 0x12:
 461         case 0x13:
 462         case 0x16:
 463                 extra = 1;
 464         case 0x17:
 465                 state = OTG_STATE_B_WAIT_ACON;
 466                 break;
 467         case 0x34:
 468                 state = OTG_STATE_B_HOST;
 469                 break;
 470
 471         /* default-a */
 472         case 0x36:
 473                 state = OTG_STATE_A_IDLE;
 474                 break;
 475         case 0x3c:
 476                 state = OTG_STATE_A_WAIT_VFALL;
 477                 break;
 478         case 0x7d:
 479                 state = OTG_STATE_A_VBUS_ERR;
 480                 break;
 481         case 0x9e:
 482         case 0x9f:
 483                 extra = 1;
 484         case 0x89:
 485                 state = OTG_STATE_A_PERIPHERAL;
 486                 break;
 487         case 0xb7:
 488                 state = OTG_STATE_A_WAIT_VRISE;
 489                 break;
 490         case 0xb8:
 491                 state = OTG_STATE_A_WAIT_BCON;
 492                 break;
 493         case 0xb9:
 494                 state = OTG_STATE_A_HOST;
 495                 break;
 496         case 0xba:
 497                 state = OTG_STATE_A_SUSPEND;
 498                 break;
 499         default:
 500                 break;
 501         }
 502         if (isp->otg.state == state && !extra)
 503                 return;
 504         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 505                 state_string(state), fsm, state_name(isp),
 506                 omap_readl(OTG_CTRL));
 507 }
 508
 509 #else
 510
 511 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 512
 513 #endif
 514
 515 /* outputs from ISP1301_INTERRUPT_SOURCE */
 516 static void update_otg1(struct isp1301 *isp, u8 int_src)
 517 {
 518         u32     otg_ctrl;
 519
 520         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 521         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 522         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 523
 524
 525         if (int_src & INTR_SESS_VLD)
 526                 otg_ctrl |= OTG_ASESSVLD;
 527         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 528                 a_idle(isp, "vfall");
 529                 otg_ctrl &= ~OTG_CTRL_BITS;
 530         }
 531         if (int_src & INTR_VBUS_VLD)
 532                 otg_ctrl |= OTG_VBUSVLD;
 533         if (int_src & INTR_ID_GND) {            /* default-A */
 534                 if (isp->otg.state == OTG_STATE_B_IDLE
 535                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 536                         a_idle(isp, "init");
 537                         return;
 538                 }
 539         } else {                                /* default-B */
 540                 otg_ctrl |= OTG_ID;
 541                 if (isp->otg.state == OTG_STATE_A_IDLE
 542                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 543                         b_idle(isp, "init");
 544                         return;
 545                 }
 546         }
 547         omap_writel(otg_ctrl, OTG_CTRL);
 548 }
 549
 550 /* outputs from ISP1301_OTG_STATUS */
 551 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 552 {
 553         u32     otg_ctrl;
 554
 555         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 556         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 557         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 558         if (otg_status & OTG_B_SESS_VLD)
 559                 otg_ctrl |= OTG_BSESSVLD;
 560         else if (otg_status & OTG_B_SESS_END)
 561                 otg_ctrl |= OTG_BSESSEND;
 562         omap_writel(otg_ctrl, OTG_CTRL);
 563 }
 564
 565 /* inputs going to ISP1301 */
 566 static void otg_update_isp(struct isp1301 *isp)
 567 {
 568         u32     otg_ctrl, otg_change;
 569         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 570
 571         otg_ctrl = omap_readl(OTG_CTRL);
 572         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 573         isp->last_otg_ctrl = otg_ctrl;
 574         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 575
 576         switch (isp->otg.state) {
 577         case OTG_STATE_B_IDLE:
 578         case OTG_STATE_B_PERIPHERAL:
 579         case OTG_STATE_B_SRP_INIT:
 580                 if (!(otg_ctrl & OTG_PULLUP)) {
 581                         // if (otg_ctrl & OTG_B_HNPEN) {
 582                         if (isp->otg.gadget->b_hnp_enable) {
 583                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 584                                 pr_debug("  --> b_wait_acon\n");
 585                         }
 586                         goto pulldown;
 587                 }
 588 pullup:
 589                 set |= OTG1_DP_PULLUP;
 590                 clr |= OTG1_DP_PULLDOWN;
 591                 break;
 592         case OTG_STATE_A_SUSPEND:
 593         case OTG_STATE_A_PERIPHERAL:
 594                 if (otg_ctrl & OTG_PULLUP)
 595                         goto pullup;
 596                 /* FALLTHROUGH */
 597         // case OTG_STATE_B_WAIT_ACON:
 598         default:
 599 pulldown:
 600                 set |= OTG1_DP_PULLDOWN;
 601                 clr |= OTG1_DP_PULLUP;
 602                 break;
 603         }
 604
 605 #       define toggle(OTG,ISP) do { \
 606                 if (otg_ctrl & OTG) set |= ISP; \
 607                 else clr |= ISP; \
 608                 } while (0)
 609
 610         if (!(isp->otg.host))
 611                 otg_ctrl &= ~OTG_DRV_VBUS;
 612
 613         switch (isp->otg.state) {
 614         case OTG_STATE_A_SUSPEND:
 615                 if (otg_ctrl & OTG_DRV_VBUS) {
 616                         set |= OTG1_VBUS_DRV;
 617                         break;
 618                 }
 619                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 620                 notresponding(isp);
 621
 622                 /* FALLTHROUGH */
 623         case OTG_STATE_A_VBUS_ERR:
 624                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 625                 pr_debug("  --> a_wait_vfall\n");
 626                 /* FALLTHROUGH */
 627         case OTG_STATE_A_WAIT_VFALL:
 628                 /* FIXME usbcore thinks port power is still on ... */
 629                 clr |= OTG1_VBUS_DRV;
 630                 break;
 631         case OTG_STATE_A_IDLE:
 632                 if (otg_ctrl & OTG_DRV_VBUS) {
 633                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 634                         pr_debug("  --> a_wait_vrise\n");
 635                 }
 636                 /* FALLTHROUGH */
 637         default:
 638                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 639         }
 640
 641         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 642         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 643
 644 #       undef toggle
 645
 646         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 647         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 648
 649         /* HNP switch to host or peripheral; and SRP */
 650         if (otg_change & OTG_PULLUP) {
 651                 u32 l;
 652
 653                 switch (isp->otg.state) {
 654                 case OTG_STATE_B_IDLE:
 655                         if (clr & OTG1_DP_PULLUP)
 656                                 break;
 657                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 658                         pr_debug("  --> b_peripheral\n");
 659                         break;
 660                 case OTG_STATE_A_SUSPEND:
 661                         if (clr & OTG1_DP_PULLUP)
 662                                 break;
 663                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 664                         pr_debug("  --> a_peripheral\n");
 665                         break;
 666                 default:
 667                         break;
 668                 }
 669                 l = omap_readl(OTG_CTRL);
 670                 l |= OTG_PULLUP;
 671                 omap_writel(l, OTG_CTRL);
 672         }
 673
 674         check_state(isp, __func__);
 675         dump_regs(isp, "otg->isp1301");
 676 }
 677
 678 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 679 {
 680         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 681         u32             otg_ctrl;
 682         int             ret = IRQ_NONE;
 683         struct isp1301  *isp = _isp;
 684
 685         /* update ISP1301 transciever from OTG controller */
 686         if (otg_irq & OPRT_CHG) {
 687                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 688                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 689                 ret = IRQ_HANDLED;
 690
 691         /* SRP to become b_peripheral failed */
 692         } else if (otg_irq & B_SRP_TMROUT) {
 693                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 694                 notresponding(isp);
 695
 696                 /* gadget drivers that care should monitor all kinds of
 697                  * remote wakeup (SRP, normal) using their own timer
 698                  * to give "check cable and A-device" messages.
 699                  */
 700                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 701                         b_idle(isp, "srp_timeout");
 702
 703                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 704                 ret = IRQ_HANDLED;
 705
 706         /* HNP to become b_host failed */
 707         } else if (otg_irq & B_HNP_FAIL) {
 708                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 709                                 state_name(isp), omap_readl(OTG_CTRL));
 710                 notresponding(isp);
 711
 712                 otg_ctrl = omap_readl(OTG_CTRL);
 713                 otg_ctrl |= OTG_BUSDROP;
 714                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 715                 omap_writel(otg_ctrl, OTG_CTRL);
 716
 717                 /* subset of b_peripheral()... */
 718                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 719                 pr_debug("  --> b_peripheral\n");
 720
 721                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 722                 ret = IRQ_HANDLED;
 723
 724         /* detect SRP from B-device ... */
 725         } else if (otg_irq & A_SRP_DETECT) {
 726                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 727                                 state_name(isp), omap_readl(OTG_CTRL));
 728
 729                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 730                 switch (isp->otg.state) {
 731                 case OTG_STATE_A_IDLE:
 732                         if (!isp->otg.host)
 733                                 break;
 734                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 735                         otg_ctrl = omap_readl(OTG_CTRL);
 736                         otg_ctrl |= OTG_A_BUSREQ;
 737                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 738                                         & ~OTG_XCEIV_INPUTS
 739                                         & OTG_CTRL_MASK;
 740                         omap_writel(otg_ctrl, OTG_CTRL);
 741                         break;
 742                 default:
 743                         break;
 744                 }
 745
 746                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 747                 ret = IRQ_HANDLED;
 748
 749         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 750          * we don't track them separately
 751          */
 752         } else if (otg_irq & A_REQ_TMROUT) {
 753                 otg_ctrl = omap_readl(OTG_CTRL);
 754                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 755                                 state_name(isp), otg_ctrl);
 756                 notresponding(isp);
 757
 758                 otg_ctrl |= OTG_BUSDROP;
 759                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 760                 omap_writel(otg_ctrl, OTG_CTRL);
 761                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 762
 763                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 764                 ret = IRQ_HANDLED;
 765
 766         /* A-supplied voltage fell too low; overcurrent */
 767         } else if (otg_irq & A_VBUS_ERR) {
 768                 otg_ctrl = omap_readl(OTG_CTRL);
 769                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 770                         state_name(isp), otg_irq, otg_ctrl);
 771
 772                 otg_ctrl |= OTG_BUSDROP;
 773                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 774                 omap_writel(otg_ctrl, OTG_CTRL);
 775                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 776
 777                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 778                 ret = IRQ_HANDLED;
 779
 780         /* switch driver; the transciever code activates it,
 781          * ungating the udc clock or resuming OHCI.
 782          */
 783         } else if (otg_irq & DRIVER_SWITCH) {
 784                 int     kick = 0;
 785
 786                 otg_ctrl = omap_readl(OTG_CTRL);
 787                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 788                                 state_name(isp),
 789                                 (otg_ctrl & OTG_DRIVER_SEL)
 790                                         ? "gadget" : "host",
 791                                 otg_ctrl);
 792                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 793
 794                 /* role is peripheral */
 795                 if (otg_ctrl & OTG_DRIVER_SEL) {
 796                         switch (isp->otg.state) {
 797                         case OTG_STATE_A_IDLE:
 798                                 b_idle(isp, __func__);
 799                                 break;
 800                         default:
 801                                 break;
 802                         }
 803                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 804
 805                 /* role is host */
 806                 } else {
 807                         if (!(otg_ctrl & OTG_ID)) {
 808                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 809                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 810                         }
 811
 812                         if (isp->otg.host) {
 813                                 switch (isp->otg.state) {
 814                                 case OTG_STATE_B_WAIT_ACON:
 815                                         isp->otg.state = OTG_STATE_B_HOST;
 816                                         pr_debug("  --> b_host\n");
 817                                         kick = 1;
 818                                         break;
 819                                 case OTG_STATE_A_WAIT_BCON:
 820                                         isp->otg.state = OTG_STATE_A_HOST;
 821                                         pr_debug("  --> a_host\n");
 822                                         break;
 823                                 case OTG_STATE_A_PERIPHERAL:
 824                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 825                                         pr_debug("  --> a_wait_bcon\n");
 826                                         break;
 827                                 default:
 828                                         break;
 829                                 }
 830                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 831                         }
 832                 }
 833
 834                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 835                 ret = IRQ_HANDLED;
 836
 837                 if (kick)
 838                         usb_bus_start_enum(isp->otg.host,
 839                                                 isp->otg.host->otg_port);
 840         }
 841
 842         check_state(isp, __func__);
 843         return ret;
 844 }
 845
 846 static struct platform_device *otg_dev;
 847
 848 static int otg_init(struct isp1301 *isp)
 849 {
 850         u32 l;
 851
 852         if (!otg_dev)
 853                 return -ENODEV;
 854
 855         dump_regs(isp, __func__);
 856         /* some of these values are board-specific... */
 857         l = omap_readl(OTG_SYSCON_2);
 858         l |= OTG_EN
 859                 /* for B-device: */
 860                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 861                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 862                 // | (3 << 24)          /* 2msec VBUS pulse */
 863                 /* for A-device: */
 864                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 865                 | SRP_DPW               /* detect 167+ns SRP pulses */
 866                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 867                 ;
 868         omap_writel(l, OTG_SYSCON_2);
 869
 870         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 871         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 872
 873         check_state(isp, __func__);
 874         pr_debug("otg: %s, %s %06x\n",
 875                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 876
 877         omap_writew(DRIVER_SWITCH | OPRT_CHG
 878                         | B_SRP_TMROUT | B_HNP_FAIL
 879                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 880
 881         l = omap_readl(OTG_SYSCON_2);
 882         l |= OTG_EN;
 883         omap_writel(l, OTG_SYSCON_2);
 884
 885         return 0;
 886 }
 887
 888 static int otg_probe(struct platform_device *dev)
 889 {
 890         // struct omap_usb_config *config = dev->platform_data;
 891
 892         otg_dev = dev;
 893         return 0;
 894 }
 895
 896 static int otg_remove(struct platform_device *dev)
 897 {
 898         otg_dev = 0;
 899         return 0;
 900 }
 901
 902 struct platform_driver omap_otg_driver = {
 903         .probe          = otg_probe,
 904         .remove         = otg_remove,
 905         .driver         = {
 906                 .owner  = THIS_MODULE,
 907                 .name   = "omap_otg",
 908         },
 909 };
 910
 911 static int otg_bind(struct isp1301 *isp)
 912 {
 913         int     status;
 914
 915         if (otg_dev)
 916                 return -EBUSY;
 917
 918         status = platform_driver_register(&omap_otg_driver);
 919         if (status < 0)
 920                 return status;
 921
 922         if (otg_dev)
 923                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 924                                 IRQF_DISABLED, DRIVER_NAME, isp);
 925         else
 926                 status = -ENODEV;
 927
 928         if (status < 0)
 929                 platform_driver_unregister(&omap_otg_driver);
 930         return status;
 931 }
 932
 933 static void otg_unbind(struct isp1301 *isp)
 934 {
 935         if (!otg_dev)
 936                 return;
 937         free_irq(otg_dev->resource[1].start, isp);
 938 }
 939
 940 #else
 941
 942 /* OTG controller isn't clocked */
 943
 944 #endif  /* CONFIG_USB_OTG */
 945
 946 /*-------------------------------------------------------------------------*/
 947
 948 static void b_peripheral(struct isp1301 *isp)
 949 {
 950         u32 l;
 951
 952         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 953         omap_writel(l, OTG_CTRL);
 954
 955         usb_gadget_vbus_connect(isp->otg.gadget);
 956
 957 #ifdef  CONFIG_USB_OTG
 958         enable_vbus_draw(isp, 8);
 959         otg_update_isp(isp);
 960 #else
 961         enable_vbus_draw(isp, 100);
 962         /* UDC driver just set OTG_BSESSVLD */
 963         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 964         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 965         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 966         pr_debug("  --> b_peripheral\n");
 967         dump_regs(isp, "2periph");
 968 #endif
 969 }
 970
 971 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 972 {
 973         u8                      isp_stat, isp_bstat;
 974         enum usb_otg_state      state = isp->otg.state;
 975
 976         if (stat & INTR_BDIS_ACON)
 977                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 978
 979         /* start certain state transitions right away */
 980         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 981         if (isp_stat & INTR_ID_GND) {
 982                 if (isp->otg.default_a) {
 983                         switch (state) {
 984                         case OTG_STATE_B_IDLE:
 985                                 a_idle(isp, "idle");
 986                                 /* FALLTHROUGH */
 987                         case OTG_STATE_A_IDLE:
 988                                 enable_vbus_source(isp);
 989                                 /* FALLTHROUGH */
 990                         case OTG_STATE_A_WAIT_VRISE:
 991                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 992                                  * the HC will transition to A_HOST (or
 993                                  * A_SUSPEND!) without our noticing except
 994                                  * when HNP is used.
 995                                  */
 996                                 if (isp_stat & INTR_VBUS_VLD)
 997                                         isp->otg.state = OTG_STATE_A_HOST;
 998                                 break;
 999                         case OTG_STATE_A_WAIT_VFALL:
1000                                 if (!(isp_stat & INTR_SESS_VLD))
1001                                         a_idle(isp, "vfell");
1002                                 break;
1003                         default:
1004                                 if (!(isp_stat & INTR_VBUS_VLD))
1005                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1006                                 break;
1007                         }
1008                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1009                 } else {
1010                         switch (state) {
1011                         case OTG_STATE_B_PERIPHERAL:
1012                         case OTG_STATE_B_HOST:
1013                         case OTG_STATE_B_WAIT_ACON:
1014                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1015                                 break;
1016                         default:
1017                                 break;
1018                         }
1019                         if (state != OTG_STATE_A_IDLE)
1020                                 a_idle(isp, "id");
1021                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1022                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1023                         isp_bstat = 0;
1024                 }
1025         } else {
1026                 u32 l;
1027
1028                 /* if user unplugged mini-A end of cable,
1029                  * don't bypass A_WAIT_VFALL.
1030                  */
1031                 if (isp->otg.default_a) {
1032                         switch (state) {
1033                         default:
1034                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1035                                 break;
1036                         case OTG_STATE_A_WAIT_VFALL:
1037                                 state = OTG_STATE_A_IDLE;
1038                                 /* khubd may take a while to notice and
1039                                  * handle this disconnect, so don't go
1040                                  * to B_IDLE quite yet.
1041                                  */
1042                                 break;
1043                         case OTG_STATE_A_IDLE:
1044                                 host_suspend(isp);
1045                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1046                                                 MC1_BDIS_ACON_EN);
1047                                 isp->otg.state = OTG_STATE_B_IDLE;
1048                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1049                                 l &= ~OTG_CTRL_BITS;
1050                                 omap_writel(l, OTG_CTRL);
1051                                 break;
1052                         case OTG_STATE_B_IDLE:
1053                                 break;
1054                         }
1055                 }
1056                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1057
1058                 switch (isp->otg.state) {
1059                 case OTG_STATE_B_PERIPHERAL:
1060                 case OTG_STATE_B_WAIT_ACON:
1061                 case OTG_STATE_B_HOST:
1062                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1063                                 break;
1064                         enable_vbus_draw(isp, 0);
1065 #ifndef CONFIG_USB_OTG
1066                         /* UDC driver will clear OTG_BSESSVLD */
1067                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1068                                                 OTG1_DP_PULLDOWN);
1069                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1070                                                 OTG1_DP_PULLUP);
1071                         dump_regs(isp, __func__);
1072 #endif
1073                         /* FALLTHROUGH */
1074                 case OTG_STATE_B_SRP_INIT:
1075                         b_idle(isp, __func__);
1076                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1077                         omap_writel(l, OTG_CTRL);
1078                         /* FALLTHROUGH */
1079                 case OTG_STATE_B_IDLE:
1080                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1081 #ifdef  CONFIG_USB_OTG
1082                                 update_otg1(isp, isp_stat);
1083                                 update_otg2(isp, isp_bstat);
1084 #endif
1085                                 b_peripheral(isp);
1086                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1087                                 isp_bstat |= OTG_B_SESS_END;
1088                         break;
1089                 case OTG_STATE_A_WAIT_VFALL:
1090                         break;
1091                 default:
1092                         pr_debug("otg: unsupported b-device %s\n",
1093                                 state_name(isp));
1094                         break;
1095                 }
1096         }
1097
1098         if (state != isp->otg.state)
1099                 pr_debug("  isp, %s -> %s\n",
1100                                 state_string(state), state_name(isp));
1101
1102 #ifdef  CONFIG_USB_OTG
1103         /* update the OTG controller state to match the isp1301; may
1104          * trigger OPRT_CHG irqs for changes going to the isp1301.
1105          */
1106         update_otg1(isp, isp_stat);
1107         update_otg2(isp, isp_bstat);
1108         check_state(isp, __func__);
1109 #endif
1110
1111         dump_regs(isp, "isp1301->otg");
1112 }
1113
1114 /*-------------------------------------------------------------------------*/
1115
1116 static u8 isp1301_clear_latch(struct isp1301 *isp)
1117 {
1118         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1119         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1120         return latch;
1121 }
1122
1123 static void
1124 isp1301_work(struct work_struct *work)
1125 {
1126         struct isp1301  *isp = container_of(work, struct isp1301, work);
1127         int             stop;
1128
1129         /* implicit lock:  we're the only task using this device */
1130         isp->working = 1;
1131         do {
1132                 stop = test_bit(WORK_STOP, &isp->todo);
1133
1134 #ifdef  CONFIG_USB_OTG
1135                 /* transfer state from otg engine to isp1301 */
1136                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1137                         otg_update_isp(isp);
1138                         put_device(&isp->client.dev);
1139                 }
1140 #endif
1141                 /* transfer state from isp1301 to otg engine */
1142                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1143                         u8              stat = isp1301_clear_latch(isp);
1144
1145                         isp_update_otg(isp, stat);
1146                         put_device(&isp->client.dev);
1147                 }
1148
1149                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1150                         u32     otg_ctrl;
1151
1152                         /*
1153                          * skip A_WAIT_VRISE; hc transitions invisibly
1154                          * skip A_WAIT_BCON; same.
1155                          */
1156                         switch (isp->otg.state) {
1157                         case OTG_STATE_A_WAIT_BCON:
1158                         case OTG_STATE_A_WAIT_VRISE:
1159                                 isp->otg.state = OTG_STATE_A_HOST;
1160                                 pr_debug("  --> a_host\n");
1161                                 otg_ctrl = omap_readl(OTG_CTRL);
1162                                 otg_ctrl |= OTG_A_BUSREQ;
1163                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1164                                                 & OTG_CTRL_MASK;
1165                                 omap_writel(otg_ctrl, OTG_CTRL);
1166                                 break;
1167                         case OTG_STATE_B_WAIT_ACON:
1168                                 isp->otg.state = OTG_STATE_B_HOST;
1169                                 pr_debug("  --> b_host (acon)\n");
1170                                 break;
1171                         case OTG_STATE_B_HOST:
1172                         case OTG_STATE_B_IDLE:
1173                         case OTG_STATE_A_IDLE:
1174                                 break;
1175                         default:
1176                                 pr_debug("  host resume in %s\n",
1177                                                 state_name(isp));
1178                         }
1179                         host_resume(isp);
1180                         // mdelay(10);
1181                         put_device(&isp->client.dev);
1182                 }
1183
1184                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1185 #ifdef  VERBOSE
1186                         dump_regs(isp, "timer");
1187                         if (!stop)
1188                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1189 #endif
1190                         put_device(&isp->client.dev);
1191                 }
1192
1193                 if (isp->todo)
1194                         dev_vdbg(&isp->client.dev,
1195                                 "work done, todo = 0x%lx\n",
1196                                 isp->todo);
1197                 if (stop) {
1198                         dev_dbg(&isp->client.dev, "stop\n");
1199                         break;
1200                 }
1201         } while (isp->todo);
1202         isp->working = 0;
1203 }
1204
1205 static irqreturn_t isp1301_irq(int irq, void *isp)
1206 {
1207         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1208         return IRQ_HANDLED;
1209 }
1210
1211 static void isp1301_timer(unsigned long _isp)
1212 {
1213         isp1301_defer_work((void *)_isp, WORK_TIMER);
1214 }
1215
1216 /*-------------------------------------------------------------------------*/
1217
1218 static void isp1301_release(struct device *dev)
1219 {
1220         struct isp1301  *isp;
1221
1222         isp = container_of(dev, struct isp1301, client.dev);
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 isp1301_detach_client(struct i2c_client *i2c)
1233 {
1234         struct isp1301  *isp;
1235
1236         isp = container_of(i2c, struct isp1301, client);
1237
1238         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1239         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1240         free_irq(isp->irq, isp);
1241 #ifdef  CONFIG_USB_OTG
1242         otg_unbind(isp);
1243 #endif
1244         if (machine_is_omap_h2())
1245                 omap_free_gpio(2);
1246
1247         isp->timer.data = 0;
1248         set_bit(WORK_STOP, &isp->todo);
1249         del_timer_sync(&isp->timer);
1250         flush_scheduled_work();
1251
1252         put_device(&i2c->dev);
1253         the_transceiver = 0;
1254
1255         return i2c_detach_client(i2c);
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         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 = 0;
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         u32 l;
1357
1358         if (!otg || isp != the_transceiver)
1359                 return -ENODEV;
1360
1361         if (!gadget) {
1362                 omap_writew(0, OTG_IRQ_EN);
1363                 if (!isp->otg.default_a)
1364                         enable_vbus_draw(isp, 0);
1365                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1366                 isp->otg.gadget = 0;
1367                 power_down(isp);
1368                 return 0;
1369         }
1370
1371 #ifdef  CONFIG_USB_OTG
1372         isp->otg.gadget = gadget;
1373         dev_dbg(&isp->client.dev, "registered gadget\n");
1374         /* gadget driver may be suspended until vbus_connect () */
1375         if (isp->otg.host)
1376                 return isp1301_otg_enable(isp);
1377         return 0;
1378
1379 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1380         isp->otg.gadget = gadget;
1381         // FIXME update its refcount
1382
1383         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1384         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1385         l |= OTG_ID;
1386         omap_writel(l, OTG_CTRL);
1387
1388         power_up(isp);
1389         isp->otg.state = OTG_STATE_B_IDLE;
1390
1391         if (machine_is_omap_h2())
1392                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1393
1394         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1395                 INTR_SESS_VLD);
1396         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1397                 INTR_VBUS_VLD);
1398         dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1399         dump_regs(isp, __func__);
1400
1401         /* If this has a Mini-AB connector, this mode is highly
1402          * nonstandard ... but can be handy for testing, so long
1403          * as you don't plug a Mini-A cable into the jack.
1404          */
1405         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1406                 b_peripheral(isp);
1407
1408         return 0;
1409
1410 #else
1411         dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1412         return -EINVAL;
1413 #endif
1414 }
1415
1416
1417 /*-------------------------------------------------------------------------*/
1418
1419 static int
1420 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1421 {
1422         if (!the_transceiver)
1423                 return -ENODEV;
1424         if (dev->state == OTG_STATE_B_PERIPHERAL)
1425                 enable_vbus_draw(the_transceiver, mA);
1426         return 0;
1427 }
1428
1429 static int
1430 isp1301_start_srp(struct otg_transceiver *dev)
1431 {
1432         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1433         u32             otg_ctrl;
1434
1435         if (!dev || isp != the_transceiver
1436                         || isp->otg.state != OTG_STATE_B_IDLE)
1437                 return -ENODEV;
1438
1439         otg_ctrl = omap_readl(OTG_CTRL);
1440         if (!(otg_ctrl & OTG_BSESSEND))
1441                 return -EINVAL;
1442
1443         otg_ctrl |= OTG_B_BUSREQ;
1444         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1445         omap_writel(otg_ctrl, OTG_CTRL);
1446         isp->otg.state = OTG_STATE_B_SRP_INIT;
1447
1448         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1449                         omap_readl(OTG_CTRL));
1450 #ifdef  CONFIG_USB_OTG
1451         check_state(isp, __func__);
1452 #endif
1453         return 0;
1454 }
1455
1456 static int
1457 isp1301_start_hnp(struct otg_transceiver *dev)
1458 {
1459 #ifdef  CONFIG_USB_OTG
1460         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1461         u32 l;
1462
1463         if (!dev || isp != the_transceiver)
1464                 return -ENODEV;
1465         if (isp->otg.default_a && (isp->otg.host == NULL
1466                         || !isp->otg.host->b_hnp_enable))
1467                 return -ENOTCONN;
1468         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1469                         || !isp->otg.gadget->b_hnp_enable))
1470                 return -ENOTCONN;
1471
1472         /* We want hardware to manage most HNP protocol timings.
1473          * So do this part as early as possible...
1474          */
1475         switch (isp->otg.state) {
1476         case OTG_STATE_B_HOST:
1477                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1478                 /* caller will suspend next */
1479                 break;
1480         case OTG_STATE_A_HOST:
1481 #if 0
1482                 /* autoconnect mode avoids irq latency bugs */
1483                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1484                                 MC1_BDIS_ACON_EN);
1485 #endif
1486                 /* caller must suspend then clear A_BUSREQ */
1487                 usb_gadget_vbus_connect(isp->otg.gadget);
1488                 l = omap_readl(OTG_CTRL);
1489                 l |= OTG_A_SETB_HNPEN;
1490                 omap_writel(l, OTG_CTRL);
1491
1492                 break;
1493         case OTG_STATE_A_PERIPHERAL:
1494                 /* initiated by B-Host suspend */
1495                 break;
1496         default:
1497                 return -EILSEQ;
1498         }
1499         pr_debug("otg: HNP %s, %06x ...\n",
1500                 state_name(isp), omap_readl(OTG_CTRL));
1501         check_state(isp, __func__);
1502         return 0;
1503 #else
1504         /* srp-only */
1505         return -EINVAL;
1506 #endif
1507 }
1508
1509 /*-------------------------------------------------------------------------*/
1510
1511 /* no error returns, they'd just make bus scanning stop */
1512 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1513 {
1514         int                     status;
1515         struct isp1301          *isp;
1516         struct i2c_client       *i2c;
1517
1518         if (the_transceiver)
1519                 return 0;
1520
1521         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1522         if (!isp)
1523                 return 0;
1524
1525         INIT_WORK(&isp->work, isp1301_work);
1526         init_timer(&isp->timer);
1527         isp->timer.function = isp1301_timer;
1528         isp->timer.data = (unsigned long) isp;
1529
1530         isp->irq = -1;
1531         isp->client.addr = address;
1532         i2c_set_clientdata(&isp->client, isp);
1533         isp->client.adapter = bus;
1534         isp->client.driver = &isp1301_driver;
1535         strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1536         i2c = &isp->client;
1537
1538         /* if this is a true probe, verify the chip ... */
1539         if (kind < 0) {
1540                 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1541                 if (status != I2C_VENDOR_ID_PHILIPS) {
1542                         dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1543                                 address, status);
1544                         goto fail1;
1545                 }
1546                 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1547                 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1548                         dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1549                                 address, status);
1550                         goto fail1;
1551                 }
1552         }
1553
1554         status = i2c_attach_client(i2c);
1555         if (status < 0) {
1556                 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1557                                 DRIVER_NAME, address, status);
1558 fail1:
1559                 kfree(isp);
1560                 return 0;
1561         }
1562         isp->i2c_release = i2c->dev.release;
1563         i2c->dev.release = isp1301_release;
1564
1565         /* initial development used chiprev 2.00 */
1566         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1567         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1568                 status >> 8, status & 0xff);
1569
1570         /* make like power-on reset */
1571         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1572
1573         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1574         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1575
1576         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1577                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1578         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1579                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1580
1581         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1582         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1583         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1584
1585 #ifdef  CONFIG_USB_OTG
1586         status = otg_bind(isp);
1587         if (status < 0) {
1588                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1589                 goto fail2;
1590         }
1591 #endif
1592
1593         if (machine_is_omap_h2()) {
1594                 /* full speed signaling by default */
1595                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1596                         MC1_SPEED_REG);
1597                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1598                         MC2_SPD_SUSP_CTRL);
1599
1600                 /* IRQ wired at M14 */
1601                 omap_cfg_reg(M14_1510_GPIO2);
1602                 isp->irq = OMAP_GPIO_IRQ(2);
1603                 if (gpio_request(2, "isp1301") == 0)
1604                         gpio_direction_input(2);
1605                 isp->irq_type = IRQF_TRIGGER_FALLING;
1606         }
1607
1608         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1609         status = request_irq(isp->irq, isp1301_irq,
1610                         isp->irq_type, DRIVER_NAME, isp);
1611         if (status < 0) {
1612                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1613                                 isp->irq, status);
1614 #ifdef  CONFIG_USB_OTG
1615 fail2:
1616 #endif
1617                 i2c_detach_client(i2c);
1618                 goto fail1;
1619         }
1620
1621         isp->otg.dev = &isp->client.dev;
1622         isp->otg.label = DRIVER_NAME;
1623
1624         isp->otg.set_host = isp1301_set_host,
1625         isp->otg.set_peripheral = isp1301_set_peripheral,
1626         isp->otg.set_power = isp1301_set_power,
1627         isp->otg.start_srp = isp1301_start_srp,
1628         isp->otg.start_hnp = isp1301_start_hnp,
1629
1630         enable_vbus_draw(isp, 0);
1631         power_down(isp);
1632         the_transceiver = isp;
1633
1634 #ifdef  CONFIG_USB_OTG
1635         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1636         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1637 #endif
1638
1639         dump_regs(isp, __func__);
1640
1641 #ifdef  VERBOSE
1642         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1643         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1644 #endif
1645
1646         status = otg_set_transceiver(&isp->otg);
1647         if (status < 0)
1648                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1649                         status);
1650
1651         return 0;
1652 }
1653
1654 static int isp1301_scan_bus(struct i2c_adapter *bus)
1655 {
1656         if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1657                         | I2C_FUNC_SMBUS_READ_WORD_DATA))
1658                 return -EINVAL;
1659         return i2c_probe(bus, &addr_data, isp1301_probe);
1660 }
1661
1662 static struct i2c_driver isp1301_driver = {
1663         .driver = {
1664                 .name   = "isp1301_omap",
1665         },
1666         .attach_adapter = isp1301_scan_bus,
1667         .detach_client  = isp1301_detach_client,
1668 };
1669
1670 /*-------------------------------------------------------------------------*/
1671
1672 static int __init isp_init(void)
1673 {
1674         return i2c_add_driver(&isp1301_driver);
1675 }
1676 module_init(isp_init);
1677
1678 static void __exit isp_exit(void)
1679 {
1680         if (the_transceiver)
1681                 otg_set_transceiver(0);
1682         i2c_del_driver(&isp1301_driver);
1683 }
1684 module_exit(isp_exit);
1685