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 <mach/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         struct i2c_client       c;
  54         void                    (*i2c_release)(struct device *dev);
  55
  56         int                     irq;
  57         int                     irq_type;
  58
  59         u32                     last_otg_ctrl;
  60         unsigned                working:1;
  61
  62         struct timer_list       timer;
  63
  64         /* use keventd context to change the state for us */
  65         struct work_struct      work;
  66
  67         unsigned long           todo;
  68 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  69 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  70 #               define WORK_HOST_RESUME 4       /* resume host */
  71 #               define WORK_TIMER       6       /* timer fired */
  72 #               define WORK_STOP        7       /* don't resubmit */
  73 };
  74
  75
  76 /* bits in OTG_CTRL */
  77
  78 #define OTG_XCEIV_OUTPUTS \
  79         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  80 #define OTG_XCEIV_INPUTS \
  81         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  82 #define OTG_CTRL_BITS \
  83         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  84         /* and OTG_PULLUP is sometimes written */
  85
  86 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  87         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  88         OTG_CTRL_BITS)
  89
  90
  91 /*-------------------------------------------------------------------------*/
  92
  93 #ifdef  CONFIG_MACH_OMAP_H2
  94
  95 /* board-specific PM hooks */
  96
  97 #include <asm/gpio.h>
  98 #include <mach/mux.h>
  99 #include <asm/mach-types.h>
 100
 101
 102 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 103
 104 #include <linux/i2c/tps65010.h>
 105
 106 #else
 107
 108 static inline int tps65010_set_vbus_draw(unsigned mA)
 109 {
 110         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 111         return 0;
 112 }
 113
 114 #endif
 115
 116 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 117 {
 118         int status = tps65010_set_vbus_draw(mA);
 119         if (status < 0)
 120                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 121 }
 122
 123 static void enable_vbus_source(struct isp1301 *isp)
 124 {
 125         /* this board won't supply more than 8mA vbus power.
 126          * some boards can switch a 100ma "unit load" (or more).
 127          */
 128 }
 129
 130
 131 /* products will deliver OTG messages with LEDs, GUI, etc */
 132 static inline void notresponding(struct isp1301 *isp)
 133 {
 134         printk(KERN_NOTICE "OTG device not responding.\n");
 135 }
 136
 137
 138 #endif
 139
 140 /*-------------------------------------------------------------------------*/
 141
 142 /* only two addresses possible */
 143 #define ISP_BASE                0x2c
 144 static unsigned short normal_i2c[] = {
 145         ISP_BASE, ISP_BASE + 1,
 146         I2C_CLIENT_END };
 147
 148 I2C_CLIENT_INSMOD;
 149
 150 static struct i2c_driver isp1301_driver;
 151
 152 /* smbus apis are used for portability */
 153
 154 static inline u8
 155 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 156 {
 157         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 158 }
 159
 160 static inline int
 161 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 162 {
 163         return i2c_smbus_read_word_data(isp->client, reg);
 164 }
 165
 166 static inline int
 167 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 168 {
 169         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 170 }
 171
 172 static inline int
 173 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 174 {
 175         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 176 }
 177
 178 /*-------------------------------------------------------------------------*/
 179
 180 /* identification */
 181 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 182 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 183 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 184
 185 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 186 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 187
 188 /* operational registers */
 189 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 190 #       define  MC1_SPEED               (1 << 0)
 191 #       define  MC1_SUSPEND             (1 << 1)
 192 #       define  MC1_DAT_SE0             (1 << 2)
 193 #       define  MC1_TRANSPARENT         (1 << 3)
 194 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 195 #       define  MC1_OE_INT_EN           (1 << 5)
 196 #       define  MC1_UART_EN             (1 << 6)
 197 #       define  MC1_MASK                0x7f
 198 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 199 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 200 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 201 #       define  MC2_BI_DI               (1 << 2)
 202 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 203 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 204 #       define  MC2_AUDIO_EN            (1 << 5)
 205 #       define  MC2_PSW_EN              (1 << 6)
 206 #       define  MC2_EN2V7               (1 << 7)
 207 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 208 #       define  OTG1_DP_PULLUP          (1 << 0)
 209 #       define  OTG1_DM_PULLUP          (1 << 1)
 210 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 211 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 212 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 213 #       define  OTG1_VBUS_DRV           (1 << 5)
 214 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 215 #       define  OTG1_VBUS_CHRG          (1 << 7)
 216 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 217 #       define  OTG_B_SESS_END          (1 << 6)
 218 #       define  OTG_B_SESS_VLD          (1 << 7)
 219
 220 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 221 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 222
 223 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 224 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 225
 226 /* same bitfields in all interrupt registers */
 227 #       define  INTR_VBUS_VLD           (1 << 0)
 228 #       define  INTR_SESS_VLD           (1 << 1)
 229 #       define  INTR_DP_HI              (1 << 2)
 230 #       define  INTR_ID_GND             (1 << 3)
 231 #       define  INTR_DM_HI              (1 << 4)
 232 #       define  INTR_ID_FLOAT           (1 << 5)
 233 #       define  INTR_BDIS_ACON          (1 << 6)
 234 #       define  INTR_CR_INT             (1 << 7)
 235
 236 /*-------------------------------------------------------------------------*/
 237
 238 static const char *state_string(enum usb_otg_state state)
 239 {
 240         switch (state) {
 241         case OTG_STATE_A_IDLE:          return "a_idle";
 242         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 243         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 244         case OTG_STATE_A_HOST:          return "a_host";
 245         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 246         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 247         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 248         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 249         case OTG_STATE_B_IDLE:          return "b_idle";
 250         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 251         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 252         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 253         case OTG_STATE_B_HOST:          return "b_host";
 254         default:                        return "UNDEFINED";
 255         }
 256 }
 257
 258 static inline const char *state_name(struct isp1301 *isp)
 259 {
 260         return state_string(isp->otg.state);
 261 }
 262
 263 /*-------------------------------------------------------------------------*/
 264
 265 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 266  * not everything is guarded by board-specific checks, or even using
 267  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 268  *
 269  * ALSO:  this currently doesn't use ISP1301 low-power modes
 270  * while OTG is running.
 271  */
 272
 273 static void power_down(struct isp1301 *isp)
 274 {
 275         isp->otg.state = OTG_STATE_UNDEFINED;
 276
 277         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 278         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 279
 280         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 281         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 282 }
 283
 284 static void power_up(struct isp1301 *isp)
 285 {
 286         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 287         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 288
 289         /* do this only when cpu is driving transceiver,
 290          * so host won't see a low speed device...
 291          */
 292         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 293 }
 294
 295 #define NO_HOST_SUSPEND
 296
 297 static int host_suspend(struct isp1301 *isp)
 298 {
 299 #ifdef  NO_HOST_SUSPEND
 300         return 0;
 301 #else
 302         struct device   *dev;
 303
 304         if (!isp->otg.host)
 305                 return -ENODEV;
 306
 307         /* Currently ASSUMES only the OTG port matters;
 308          * other ports could be active...
 309          */
 310         dev = isp->otg.host->controller;
 311         return dev->driver->suspend(dev, 3, 0);
 312 #endif
 313 }
 314
 315 static int host_resume(struct isp1301 *isp)
 316 {
 317 #ifdef  NO_HOST_SUSPEND
 318         return 0;
 319 #else
 320         struct device   *dev;
 321
 322         if (!isp->otg.host)
 323                 return -ENODEV;
 324
 325         dev = isp->otg.host->controller;
 326         return dev->driver->resume(dev, 0);
 327 #endif
 328 }
 329
 330 static int gadget_suspend(struct isp1301 *isp)
 331 {
 332         isp->otg.gadget->b_hnp_enable = 0;
 333         isp->otg.gadget->a_hnp_support = 0;
 334         isp->otg.gadget->a_alt_hnp_support = 0;
 335         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 336 }
 337
 338 /*-------------------------------------------------------------------------*/
 339
 340 #define TIMER_MINUTES   10
 341 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 342
 343 /* Almost all our I2C messaging comes from a work queue's task context.
 344  * NOTE: guaranteeing certain response times might mean we shouldn't
 345  * share keventd's work queue; a realtime task might be safest.
 346  */
 347 void
 348 isp1301_defer_work(struct isp1301 *isp, int work)
 349 {
 350         int status;
 351
 352         if (isp && !test_and_set_bit(work, &isp->todo)) {
 353                 (void) get_device(&isp->client->dev);
 354                 status = schedule_work(&isp->work);
 355                 if (!status && !isp->working)
 356                         dev_vdbg(&isp->client->dev,
 357                                 "work item %d may be lost\n", work);
 358         }
 359 }
 360
 361 /* called from irq handlers */
 362 static void a_idle(struct isp1301 *isp, const char *tag)
 363 {
 364         u32 l;
 365
 366         if (isp->otg.state == OTG_STATE_A_IDLE)
 367                 return;
 368
 369         isp->otg.default_a = 1;
 370         if (isp->otg.host) {
 371                 isp->otg.host->is_b_host = 0;
 372                 host_suspend(isp);
 373         }
 374         if (isp->otg.gadget) {
 375                 isp->otg.gadget->is_a_peripheral = 1;
 376                 gadget_suspend(isp);
 377         }
 378         isp->otg.state = OTG_STATE_A_IDLE;
 379         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 380         omap_writel(l, OTG_CTRL);
 381         isp->last_otg_ctrl = l;
 382         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 383 }
 384
 385 /* called from irq handlers */
 386 static void b_idle(struct isp1301 *isp, const char *tag)
 387 {
 388         u32 l;
 389
 390         if (isp->otg.state == OTG_STATE_B_IDLE)
 391                 return;
 392
 393         isp->otg.default_a = 0;
 394         if (isp->otg.host) {
 395                 isp->otg.host->is_b_host = 1;
 396                 host_suspend(isp);
 397         }
 398         if (isp->otg.gadget) {
 399                 isp->otg.gadget->is_a_peripheral = 0;
 400                 gadget_suspend(isp);
 401         }
 402         isp->otg.state = OTG_STATE_B_IDLE;
 403         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 404         omap_writel(l, OTG_CTRL);
 405         isp->last_otg_ctrl = l;
 406         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 407 }
 408
 409 static void
 410 dump_regs(struct isp1301 *isp, const char *label)
 411 {
 412 #ifdef  DEBUG
 413         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 414         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 415         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 416
 417         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 418                 omap_readl(OTG_CTRL), label, state_name(isp),
 419                 ctrl, status, src);
 420         /* mode control and irq enables don't change much */
 421 #endif
 422 }
 423
 424 /*-------------------------------------------------------------------------*/
 425
 426 #ifdef  CONFIG_USB_OTG
 427
 428 /*
 429  * The OMAP OTG controller handles most of the OTG state transitions.
 430  *
 431  * We translate isp1301 outputs (mostly voltage comparator status) into
 432  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 433  * flags into isp1301 inputs ... and infer state transitions.
 434  */
 435
 436 #ifdef  VERBOSE
 437
 438 static void check_state(struct isp1301 *isp, const char *tag)
 439 {
 440         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 441         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 442         unsigned                extra = 0;
 443
 444         switch (fsm) {
 445
 446         /* default-b */
 447         case 0x0:
 448                 state = OTG_STATE_B_IDLE;
 449                 break;
 450         case 0x3:
 451         case 0x7:
 452                 extra = 1;
 453         case 0x1:
 454                 state = OTG_STATE_B_PERIPHERAL;
 455                 break;
 456         case 0x11:
 457                 state = OTG_STATE_B_SRP_INIT;
 458                 break;
 459
 460         /* extra dual-role default-b states */
 461         case 0x12:
 462         case 0x13:
 463         case 0x16:
 464                 extra = 1;
 465         case 0x17:
 466                 state = OTG_STATE_B_WAIT_ACON;
 467                 break;
 468         case 0x34:
 469                 state = OTG_STATE_B_HOST;
 470                 break;
 471
 472         /* default-a */
 473         case 0x36:
 474                 state = OTG_STATE_A_IDLE;
 475                 break;
 476         case 0x3c:
 477                 state = OTG_STATE_A_WAIT_VFALL;
 478                 break;
 479         case 0x7d:
 480                 state = OTG_STATE_A_VBUS_ERR;
 481                 break;
 482         case 0x9e:
 483         case 0x9f:
 484                 extra = 1;
 485         case 0x89:
 486                 state = OTG_STATE_A_PERIPHERAL;
 487                 break;
 488         case 0xb7:
 489                 state = OTG_STATE_A_WAIT_VRISE;
 490                 break;
 491         case 0xb8:
 492                 state = OTG_STATE_A_WAIT_BCON;
 493                 break;
 494         case 0xb9:
 495                 state = OTG_STATE_A_HOST;
 496                 break;
 497         case 0xba:
 498                 state = OTG_STATE_A_SUSPEND;
 499                 break;
 500         default:
 501                 break;
 502         }
 503         if (isp->otg.state == state && !extra)
 504                 return;
 505         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 506                 state_string(state), fsm, state_name(isp),
 507                 omap_readl(OTG_CTRL));
 508 }
 509
 510 #else
 511
 512 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 513
 514 #endif
 515
 516 /* outputs from ISP1301_INTERRUPT_SOURCE */
 517 static void update_otg1(struct isp1301 *isp, u8 int_src)
 518 {
 519         u32     otg_ctrl;
 520
 521         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 522         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 523         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 524
 525
 526         if (int_src & INTR_SESS_VLD)
 527                 otg_ctrl |= OTG_ASESSVLD;
 528         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 529                 a_idle(isp, "vfall");
 530                 otg_ctrl &= ~OTG_CTRL_BITS;
 531         }
 532         if (int_src & INTR_VBUS_VLD)
 533                 otg_ctrl |= OTG_VBUSVLD;
 534         if (int_src & INTR_ID_GND) {            /* default-A */
 535                 if (isp->otg.state == OTG_STATE_B_IDLE
 536                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 537                         a_idle(isp, "init");
 538                         return;
 539                 }
 540         } else {                                /* default-B */
 541                 otg_ctrl |= OTG_ID;
 542                 if (isp->otg.state == OTG_STATE_A_IDLE
 543                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 544                         b_idle(isp, "init");
 545                         return;
 546                 }
 547         }
 548         omap_writel(otg_ctrl, OTG_CTRL);
 549 }
 550
 551 /* outputs from ISP1301_OTG_STATUS */
 552 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 553 {
 554         u32     otg_ctrl;
 555
 556         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 557         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 558         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 559         if (otg_status & OTG_B_SESS_VLD)
 560                 otg_ctrl |= OTG_BSESSVLD;
 561         else if (otg_status & OTG_B_SESS_END)
 562                 otg_ctrl |= OTG_BSESSEND;
 563         omap_writel(otg_ctrl, OTG_CTRL);
 564 }
 565
 566 /* inputs going to ISP1301 */
 567 static void otg_update_isp(struct isp1301 *isp)
 568 {
 569         u32     otg_ctrl, otg_change;
 570         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 571
 572         otg_ctrl = omap_readl(OTG_CTRL);
 573         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 574         isp->last_otg_ctrl = otg_ctrl;
 575         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 576
 577         switch (isp->otg.state) {
 578         case OTG_STATE_B_IDLE:
 579         case OTG_STATE_B_PERIPHERAL:
 580         case OTG_STATE_B_SRP_INIT:
 581                 if (!(otg_ctrl & OTG_PULLUP)) {
 582                         // if (otg_ctrl & OTG_B_HNPEN) {
 583                         if (isp->otg.gadget->b_hnp_enable) {
 584                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 585                                 pr_debug("  --> b_wait_acon\n");
 586                         }
 587                         goto pulldown;
 588                 }
 589 pullup:
 590                 set |= OTG1_DP_PULLUP;
 591                 clr |= OTG1_DP_PULLDOWN;
 592                 break;
 593         case OTG_STATE_A_SUSPEND:
 594         case OTG_STATE_A_PERIPHERAL:
 595                 if (otg_ctrl & OTG_PULLUP)
 596                         goto pullup;
 597                 /* FALLTHROUGH */
 598         // case OTG_STATE_B_WAIT_ACON:
 599         default:
 600 pulldown:
 601                 set |= OTG1_DP_PULLDOWN;
 602                 clr |= OTG1_DP_PULLUP;
 603                 break;
 604         }
 605
 606 #       define toggle(OTG,ISP) do { \
 607                 if (otg_ctrl & OTG) set |= ISP; \
 608                 else clr |= ISP; \
 609                 } while (0)
 610
 611         if (!(isp->otg.host))
 612                 otg_ctrl &= ~OTG_DRV_VBUS;
 613
 614         switch (isp->otg.state) {
 615         case OTG_STATE_A_SUSPEND:
 616                 if (otg_ctrl & OTG_DRV_VBUS) {
 617                         set |= OTG1_VBUS_DRV;
 618                         break;
 619                 }
 620                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 621                 notresponding(isp);
 622
 623                 /* FALLTHROUGH */
 624         case OTG_STATE_A_VBUS_ERR:
 625                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 626                 pr_debug("  --> a_wait_vfall\n");
 627                 /* FALLTHROUGH */
 628         case OTG_STATE_A_WAIT_VFALL:
 629                 /* FIXME usbcore thinks port power is still on ... */
 630                 clr |= OTG1_VBUS_DRV;
 631                 break;
 632         case OTG_STATE_A_IDLE:
 633                 if (otg_ctrl & OTG_DRV_VBUS) {
 634                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 635                         pr_debug("  --> a_wait_vrise\n");
 636                 }
 637                 /* FALLTHROUGH */
 638         default:
 639                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 640         }
 641
 642         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 643         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 644
 645 #       undef toggle
 646
 647         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 648         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 649
 650         /* HNP switch to host or peripheral; and SRP */
 651         if (otg_change & OTG_PULLUP) {
 652                 u32 l;
 653
 654                 switch (isp->otg.state) {
 655                 case OTG_STATE_B_IDLE:
 656                         if (clr & OTG1_DP_PULLUP)
 657                                 break;
 658                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 659                         pr_debug("  --> b_peripheral\n");
 660                         break;
 661                 case OTG_STATE_A_SUSPEND:
 662                         if (clr & OTG1_DP_PULLUP)
 663                                 break;
 664                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 665                         pr_debug("  --> a_peripheral\n");
 666                         break;
 667                 default:
 668                         break;
 669                 }
 670                 l = omap_readl(OTG_CTRL);
 671                 l |= OTG_PULLUP;
 672                 omap_writel(l, OTG_CTRL);
 673         }
 674
 675         check_state(isp, __func__);
 676         dump_regs(isp, "otg->isp1301");
 677 }
 678
 679 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 680 {
 681         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 682         u32             otg_ctrl;
 683         int             ret = IRQ_NONE;
 684         struct isp1301  *isp = _isp;
 685
 686         /* update ISP1301 transciever from OTG controller */
 687         if (otg_irq & OPRT_CHG) {
 688                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 689                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 690                 ret = IRQ_HANDLED;
 691
 692         /* SRP to become b_peripheral failed */
 693         } else if (otg_irq & B_SRP_TMROUT) {
 694                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 695                 notresponding(isp);
 696
 697                 /* gadget drivers that care should monitor all kinds of
 698                  * remote wakeup (SRP, normal) using their own timer
 699                  * to give "check cable and A-device" messages.
 700                  */
 701                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 702                         b_idle(isp, "srp_timeout");
 703
 704                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 705                 ret = IRQ_HANDLED;
 706
 707         /* HNP to become b_host failed */
 708         } else if (otg_irq & B_HNP_FAIL) {
 709                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 710                                 state_name(isp), omap_readl(OTG_CTRL));
 711                 notresponding(isp);
 712
 713                 otg_ctrl = omap_readl(OTG_CTRL);
 714                 otg_ctrl |= OTG_BUSDROP;
 715                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 716                 omap_writel(otg_ctrl, OTG_CTRL);
 717
 718                 /* subset of b_peripheral()... */
 719                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 720                 pr_debug("  --> b_peripheral\n");
 721
 722                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 723                 ret = IRQ_HANDLED;
 724
 725         /* detect SRP from B-device ... */
 726         } else if (otg_irq & A_SRP_DETECT) {
 727                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 728                                 state_name(isp), omap_readl(OTG_CTRL));
 729
 730                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 731                 switch (isp->otg.state) {
 732                 case OTG_STATE_A_IDLE:
 733                         if (!isp->otg.host)
 734                                 break;
 735                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 736                         otg_ctrl = omap_readl(OTG_CTRL);
 737                         otg_ctrl |= OTG_A_BUSREQ;
 738                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 739                                         & ~OTG_XCEIV_INPUTS
 740                                         & OTG_CTRL_MASK;
 741                         omap_writel(otg_ctrl, OTG_CTRL);
 742                         break;
 743                 default:
 744                         break;
 745                 }
 746
 747                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 748                 ret = IRQ_HANDLED;
 749
 750         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 751          * we don't track them separately
 752          */
 753         } else if (otg_irq & A_REQ_TMROUT) {
 754                 otg_ctrl = omap_readl(OTG_CTRL);
 755                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 756                                 state_name(isp), otg_ctrl);
 757                 notresponding(isp);
 758
 759                 otg_ctrl |= OTG_BUSDROP;
 760                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 761                 omap_writel(otg_ctrl, OTG_CTRL);
 762                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 763
 764                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 765                 ret = IRQ_HANDLED;
 766
 767         /* A-supplied voltage fell too low; overcurrent */
 768         } else if (otg_irq & A_VBUS_ERR) {
 769                 otg_ctrl = omap_readl(OTG_CTRL);
 770                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 771                         state_name(isp), otg_irq, otg_ctrl);
 772
 773                 otg_ctrl |= OTG_BUSDROP;
 774                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 775                 omap_writel(otg_ctrl, OTG_CTRL);
 776                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 777
 778                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 779                 ret = IRQ_HANDLED;
 780
 781         /* switch driver; the transciever code activates it,
 782          * ungating the udc clock or resuming OHCI.
 783          */
 784         } else if (otg_irq & DRIVER_SWITCH) {
 785                 int     kick = 0;
 786
 787                 otg_ctrl = omap_readl(OTG_CTRL);
 788                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 789                                 state_name(isp),
 790                                 (otg_ctrl & OTG_DRIVER_SEL)
 791                                         ? "gadget" : "host",
 792                                 otg_ctrl);
 793                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 794
 795                 /* role is peripheral */
 796                 if (otg_ctrl & OTG_DRIVER_SEL) {
 797                         switch (isp->otg.state) {
 798                         case OTG_STATE_A_IDLE:
 799                                 b_idle(isp, __func__);
 800                                 break;
 801                         default:
 802                                 break;
 803                         }
 804                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 805
 806                 /* role is host */
 807                 } else {
 808                         if (!(otg_ctrl & OTG_ID)) {
 809                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 810                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 811                         }
 812
 813                         if (isp->otg.host) {
 814                                 switch (isp->otg.state) {
 815                                 case OTG_STATE_B_WAIT_ACON:
 816                                         isp->otg.state = OTG_STATE_B_HOST;
 817                                         pr_debug("  --> b_host\n");
 818                                         kick = 1;
 819                                         break;
 820                                 case OTG_STATE_A_WAIT_BCON:
 821                                         isp->otg.state = OTG_STATE_A_HOST;
 822                                         pr_debug("  --> a_host\n");
 823                                         break;
 824                                 case OTG_STATE_A_PERIPHERAL:
 825                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 826                                         pr_debug("  --> a_wait_bcon\n");
 827                                         break;
 828                                 default:
 829                                         break;
 830                                 }
 831                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 832                         }
 833                 }
 834
 835                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 836                 ret = IRQ_HANDLED;
 837
 838                 if (kick)
 839                         usb_bus_start_enum(isp->otg.host,
 840                                                 isp->otg.host->otg_port);
 841         }
 842
 843         check_state(isp, __func__);
 844         return ret;
 845 }
 846
 847 static struct platform_device *otg_dev;
 848
 849 static int otg_init(struct isp1301 *isp)
 850 {
 851         u32 l;
 852
 853         if (!otg_dev)
 854                 return -ENODEV;
 855
 856         dump_regs(isp, __func__);
 857         /* some of these values are board-specific... */
 858         l = omap_readl(OTG_SYSCON_2);
 859         l |= OTG_EN
 860                 /* for B-device: */
 861                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 862                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 863                 // | (3 << 24)          /* 2msec VBUS pulse */
 864                 /* for A-device: */
 865                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 866                 | SRP_DPW               /* detect 167+ns SRP pulses */
 867                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 868                 ;
 869         omap_writel(l, OTG_SYSCON_2);
 870
 871         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 872         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 873
 874         check_state(isp, __func__);
 875         pr_debug("otg: %s, %s %06x\n",
 876                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 877
 878         omap_writew(DRIVER_SWITCH | OPRT_CHG
 879                         | B_SRP_TMROUT | B_HNP_FAIL
 880                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 881
 882         l = omap_readl(OTG_SYSCON_2);
 883         l |= OTG_EN;
 884         omap_writel(l, OTG_SYSCON_2);
 885
 886         return 0;
 887 }
 888
 889 static int otg_probe(struct platform_device *dev)
 890 {
 891         // struct omap_usb_config *config = dev->platform_data;
 892
 893         otg_dev = dev;
 894         return 0;
 895 }
 896
 897 static int otg_remove(struct platform_device *dev)
 898 {
 899         otg_dev = 0;
 900         return 0;
 901 }
 902
 903 struct platform_driver omap_otg_driver = {
 904         .probe          = otg_probe,
 905         .remove         = otg_remove,
 906         .driver         = {
 907                 .owner  = THIS_MODULE,
 908                 .name   = "omap_otg",
 909         },
 910 };
 911
 912 static int otg_bind(struct isp1301 *isp)
 913 {
 914         int     status;
 915
 916         if (otg_dev)
 917                 return -EBUSY;
 918
 919         status = platform_driver_register(&omap_otg_driver);
 920         if (status < 0)
 921                 return status;
 922
 923         if (otg_dev)
 924                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 925                                 IRQF_DISABLED, DRIVER_NAME, isp);
 926         else
 927                 status = -ENODEV;
 928
 929         if (status < 0)
 930                 platform_driver_unregister(&omap_otg_driver);
 931         return status;
 932 }
 933
 934 static void otg_unbind(struct isp1301 *isp)
 935 {
 936         if (!otg_dev)
 937                 return;
 938         free_irq(otg_dev->resource[1].start, isp);
 939 }
 940
 941 #else
 942
 943 /* OTG controller isn't clocked */
 944
 945 #endif  /* CONFIG_USB_OTG */
 946
 947 /*-------------------------------------------------------------------------*/
 948
 949 static void b_peripheral(struct isp1301 *isp)
 950 {
 951         u32 l;
 952
 953         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 954         omap_writel(l, OTG_CTRL);
 955
 956         usb_gadget_vbus_connect(isp->otg.gadget);
 957
 958 #ifdef  CONFIG_USB_OTG
 959         enable_vbus_draw(isp, 8);
 960         otg_update_isp(isp);
 961 #else
 962         enable_vbus_draw(isp, 100);
 963         /* UDC driver just set OTG_BSESSVLD */
 964         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 965         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 966         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 967         pr_debug("  --> b_peripheral\n");
 968         dump_regs(isp, "2periph");
 969 #endif
 970 }
 971
 972 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 973 {
 974         u8                      isp_stat, isp_bstat;
 975         enum usb_otg_state      state = isp->otg.state;
 976
 977         if (stat & INTR_BDIS_ACON)
 978                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 979
 980         /* start certain state transitions right away */
 981         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 982         if (isp_stat & INTR_ID_GND) {
 983                 if (isp->otg.default_a) {
 984                         switch (state) {
 985                         case OTG_STATE_B_IDLE:
 986                                 a_idle(isp, "idle");
 987                                 /* FALLTHROUGH */
 988                         case OTG_STATE_A_IDLE:
 989                                 enable_vbus_source(isp);
 990                                 /* FALLTHROUGH */
 991                         case OTG_STATE_A_WAIT_VRISE:
 992                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 993                                  * the HC will transition to A_HOST (or
 994                                  * A_SUSPEND!) without our noticing except
 995                                  * when HNP is used.
 996                                  */
 997                                 if (isp_stat & INTR_VBUS_VLD)
 998                                         isp->otg.state = OTG_STATE_A_HOST;
 999                                 break;
1000                         case OTG_STATE_A_WAIT_VFALL:
1001                                 if (!(isp_stat & INTR_SESS_VLD))
1002                                         a_idle(isp, "vfell");
1003                                 break;
1004                         default:
1005                                 if (!(isp_stat & INTR_VBUS_VLD))
1006                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1007                                 break;
1008                         }
1009                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1010                 } else {
1011                         switch (state) {
1012                         case OTG_STATE_B_PERIPHERAL:
1013                         case OTG_STATE_B_HOST:
1014                         case OTG_STATE_B_WAIT_ACON:
1015                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1016                                 break;
1017                         default:
1018                                 break;
1019                         }
1020                         if (state != OTG_STATE_A_IDLE)
1021                                 a_idle(isp, "id");
1022                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1023                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1024                         isp_bstat = 0;
1025                 }
1026         } else {
1027                 u32 l;
1028
1029                 /* if user unplugged mini-A end of cable,
1030                  * don't bypass A_WAIT_VFALL.
1031                  */
1032                 if (isp->otg.default_a) {
1033                         switch (state) {
1034                         default:
1035                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1036                                 break;
1037                         case OTG_STATE_A_WAIT_VFALL:
1038                                 state = OTG_STATE_A_IDLE;
1039                                 /* khubd may take a while to notice and
1040                                  * handle this disconnect, so don't go
1041                                  * to B_IDLE quite yet.
1042                                  */
1043                                 break;
1044                         case OTG_STATE_A_IDLE:
1045                                 host_suspend(isp);
1046                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1047                                                 MC1_BDIS_ACON_EN);
1048                                 isp->otg.state = OTG_STATE_B_IDLE;
1049                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1050                                 l &= ~OTG_CTRL_BITS;
1051                                 omap_writel(l, OTG_CTRL);
1052                                 break;
1053                         case OTG_STATE_B_IDLE:
1054                                 break;
1055                         }
1056                 }
1057                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1058
1059                 switch (isp->otg.state) {
1060                 case OTG_STATE_B_PERIPHERAL:
1061                 case OTG_STATE_B_WAIT_ACON:
1062                 case OTG_STATE_B_HOST:
1063                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1064                                 break;
1065                         enable_vbus_draw(isp, 0);
1066 #ifndef CONFIG_USB_OTG
1067                         /* UDC driver will clear OTG_BSESSVLD */
1068                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1069                                                 OTG1_DP_PULLDOWN);
1070                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1071                                                 OTG1_DP_PULLUP);
1072                         dump_regs(isp, __func__);
1073 #endif
1074                         /* FALLTHROUGH */
1075                 case OTG_STATE_B_SRP_INIT:
1076                         b_idle(isp, __func__);
1077                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1078                         omap_writel(l, OTG_CTRL);
1079                         /* FALLTHROUGH */
1080                 case OTG_STATE_B_IDLE:
1081                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1082 #ifdef  CONFIG_USB_OTG
1083                                 update_otg1(isp, isp_stat);
1084                                 update_otg2(isp, isp_bstat);
1085 #endif
1086                                 b_peripheral(isp);
1087                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1088                                 isp_bstat |= OTG_B_SESS_END;
1089                         break;
1090                 case OTG_STATE_A_WAIT_VFALL:
1091                         break;
1092                 default:
1093                         pr_debug("otg: unsupported b-device %s\n",
1094                                 state_name(isp));
1095                         break;
1096                 }
1097         }
1098
1099         if (state != isp->otg.state)
1100                 pr_debug("  isp, %s -> %s\n",
1101                                 state_string(state), state_name(isp));
1102
1103 #ifdef  CONFIG_USB_OTG
1104         /* update the OTG controller state to match the isp1301; may
1105          * trigger OPRT_CHG irqs for changes going to the isp1301.
1106          */
1107         update_otg1(isp, isp_stat);
1108         update_otg2(isp, isp_bstat);
1109         check_state(isp, __func__);
1110 #endif
1111
1112         dump_regs(isp, "isp1301->otg");
1113 }
1114
1115 /*-------------------------------------------------------------------------*/
1116
1117 static u8 isp1301_clear_latch(struct isp1301 *isp)
1118 {
1119         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1120         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1121         return latch;
1122 }
1123
1124 static void
1125 isp1301_work(struct work_struct *work)
1126 {
1127         struct isp1301  *isp = container_of(work, struct isp1301, work);
1128         int             stop;
1129
1130         /* implicit lock:  we're the only task using this device */
1131         isp->working = 1;
1132         do {
1133                 stop = test_bit(WORK_STOP, &isp->todo);
1134
1135 #ifdef  CONFIG_USB_OTG
1136                 /* transfer state from otg engine to isp1301 */
1137                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1138                         otg_update_isp(isp);
1139                         put_device(&isp->client->dev);
1140                 }
1141 #endif
1142                 /* transfer state from isp1301 to otg engine */
1143                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1144                         u8              stat = isp1301_clear_latch(isp);
1145
1146                         isp_update_otg(isp, stat);
1147                         put_device(&isp->client->dev);
1148                 }
1149
1150                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1151                         u32     otg_ctrl;
1152
1153                         /*
1154                          * skip A_WAIT_VRISE; hc transitions invisibly
1155                          * skip A_WAIT_BCON; same.
1156                          */
1157                         switch (isp->otg.state) {
1158                         case OTG_STATE_A_WAIT_BCON:
1159                         case OTG_STATE_A_WAIT_VRISE:
1160                                 isp->otg.state = OTG_STATE_A_HOST;
1161                                 pr_debug("  --> a_host\n");
1162                                 otg_ctrl = omap_readl(OTG_CTRL);
1163                                 otg_ctrl |= OTG_A_BUSREQ;
1164                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1165                                                 & OTG_CTRL_MASK;
1166                                 omap_writel(otg_ctrl, OTG_CTRL);
1167                                 break;
1168                         case OTG_STATE_B_WAIT_ACON:
1169                                 isp->otg.state = OTG_STATE_B_HOST;
1170                                 pr_debug("  --> b_host (acon)\n");
1171                                 break;
1172                         case OTG_STATE_B_HOST:
1173                         case OTG_STATE_B_IDLE:
1174                         case OTG_STATE_A_IDLE:
1175                                 break;
1176                         default:
1177                                 pr_debug("  host resume in %s\n",
1178                                                 state_name(isp));
1179                         }
1180                         host_resume(isp);
1181                         // mdelay(10);
1182                         put_device(&isp->client->dev);
1183                 }
1184
1185                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1186 #ifdef  VERBOSE
1187                         dump_regs(isp, "timer");
1188                         if (!stop)
1189                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1190 #endif
1191                         put_device(&isp->client->dev);
1192                 }
1193
1194                 if (isp->todo)
1195                         dev_vdbg(&isp->client->dev,
1196                                 "work done, todo = 0x%lx\n",
1197                                 isp->todo);
1198                 if (stop) {
1199                         dev_dbg(&isp->client->dev, "stop\n");
1200                         break;
1201                 }
1202         } while (isp->todo);
1203         isp->working = 0;
1204 }
1205
1206 static irqreturn_t isp1301_irq(int irq, void *isp)
1207 {
1208         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1209         return IRQ_HANDLED;
1210 }
1211
1212 static void isp1301_timer(unsigned long _isp)
1213 {
1214         isp1301_defer_work((void *)_isp, WORK_TIMER);
1215 }
1216
1217 /*-------------------------------------------------------------------------*/
1218
1219 static void isp1301_release(struct device *dev)
1220 {
1221         struct isp1301  *isp;
1222
1223         isp = dev_get_drvdata(dev);
1224
1225         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1226         if (isp->i2c_release)
1227                 isp->i2c_release(dev);
1228         kfree (isp);
1229 }
1230
1231 static struct isp1301 *the_transceiver;
1232
1233 static int isp1301_detach_client(struct i2c_client *i2c)
1234 {
1235         struct isp1301  *isp;
1236
1237         isp = i2c_get_clientdata(i2c);
1238
1239         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1240         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1241         free_irq(isp->irq, isp);
1242 #ifdef  CONFIG_USB_OTG
1243         otg_unbind(isp);
1244 #endif
1245         if (machine_is_omap_h2())
1246                 omap_free_gpio(2);
1247
1248         isp->timer.data = 0;
1249         set_bit(WORK_STOP, &isp->todo);
1250         del_timer_sync(&isp->timer);
1251         flush_scheduled_work();
1252
1253         put_device(&i2c->dev);
1254         the_transceiver = 0;
1255
1256         return i2c_detach_client(i2c);
1257 }
1258
1259 /*-------------------------------------------------------------------------*/
1260
1261 /* NOTE:  three modes are possible here, only one of which
1262  * will be standards-conformant on any given system:
1263  *
1264  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1265  *  - HOST mode, for when there's one or more A (host) connectors
1266  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1267  *
1268  * As a rule, you won't have an isp1301 chip unless it's there to
1269  * support the OTG mode.  Other modes help testing USB controllers
1270  * in isolation from (full) OTG support, or maybe so later board
1271  * revisions can help to support those feature.
1272  */
1273
1274 #ifdef  CONFIG_USB_OTG
1275
1276 static int isp1301_otg_enable(struct isp1301 *isp)
1277 {
1278         power_up(isp);
1279         otg_init(isp);
1280
1281         /* NOTE:  since we don't change this, this provides
1282          * a few more interrupts than are strictly needed.
1283          */
1284         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1285                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1286         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1287                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1288
1289         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1290
1291         return 0;
1292 }
1293
1294 #endif
1295
1296 /* add or disable the host device+driver */
1297 static int
1298 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1299 {
1300         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1301
1302         if (!otg || isp != the_transceiver)
1303                 return -ENODEV;
1304
1305         if (!host) {
1306                 omap_writew(0, OTG_IRQ_EN);
1307                 power_down(isp);
1308                 isp->otg.host = 0;
1309                 return 0;
1310         }
1311
1312 #ifdef  CONFIG_USB_OTG
1313         isp->otg.host = host;
1314         dev_dbg(&isp->client->dev, "registered host\n");
1315         host_suspend(isp);
1316         if (isp->otg.gadget)
1317                 return isp1301_otg_enable(isp);
1318         return 0;
1319
1320 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1321         // FIXME update its refcount
1322         isp->otg.host = host;
1323
1324         power_up(isp);
1325
1326         if (machine_is_omap_h2())
1327                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1328
1329         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1330         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1331                 INTR_ID_GND);
1332         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1333                 INTR_ID_GND);
1334
1335         /* If this has a Mini-AB connector, this mode is highly
1336          * nonstandard ... but can be handy for testing, especially with
1337          * the Mini-A end of an OTG cable.  (Or something nonstandard
1338          * like MiniB-to-StandardB, maybe built with a gender mender.)
1339          */
1340         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1341
1342         dump_regs(isp, __func__);
1343
1344         return 0;
1345
1346 #else
1347         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1348         return -EINVAL;
1349 #endif
1350
1351 }
1352
1353 static int
1354 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1355 {
1356         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1357         u32 l;
1358
1359         if (!otg || isp != the_transceiver)
1360                 return -ENODEV;
1361
1362         if (!gadget) {
1363                 omap_writew(0, OTG_IRQ_EN);
1364                 if (!isp->otg.default_a)
1365                         enable_vbus_draw(isp, 0);
1366                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1367                 isp->otg.gadget = 0;
1368                 power_down(isp);
1369                 return 0;
1370         }
1371
1372 #ifdef  CONFIG_USB_OTG
1373         isp->otg.gadget = gadget;
1374         dev_dbg(&isp->client->dev, "registered gadget\n");
1375         /* gadget driver may be suspended until vbus_connect () */
1376         if (isp->otg.host)
1377                 return isp1301_otg_enable(isp);
1378         return 0;
1379
1380 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1381         isp->otg.gadget = gadget;
1382         // FIXME update its refcount
1383
1384         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1385         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1386         l |= OTG_ID;
1387         omap_writel(l, OTG_CTRL);
1388
1389         power_up(isp);
1390         isp->otg.state = OTG_STATE_B_IDLE;
1391
1392         if (machine_is_omap_h2())
1393                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1394
1395         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1396                 INTR_SESS_VLD);
1397         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1398                 INTR_VBUS_VLD);
1399         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1400         dump_regs(isp, __func__);
1401
1402         /* If this has a Mini-AB connector, this mode is highly
1403          * nonstandard ... but can be handy for testing, so long
1404          * as you don't plug a Mini-A cable into the jack.
1405          */
1406         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1407                 b_peripheral(isp);
1408
1409         return 0;
1410
1411 #else
1412         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1413         return -EINVAL;
1414 #endif
1415 }
1416
1417
1418 /*-------------------------------------------------------------------------*/
1419
1420 static int
1421 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1422 {
1423         if (!the_transceiver)
1424                 return -ENODEV;
1425         if (dev->state == OTG_STATE_B_PERIPHERAL)
1426                 enable_vbus_draw(the_transceiver, mA);
1427         return 0;
1428 }
1429
1430 static int
1431 isp1301_start_srp(struct otg_transceiver *dev)
1432 {
1433         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1434         u32             otg_ctrl;
1435
1436         if (!dev || isp != the_transceiver
1437                         || isp->otg.state != OTG_STATE_B_IDLE)
1438                 return -ENODEV;
1439
1440         otg_ctrl = omap_readl(OTG_CTRL);
1441         if (!(otg_ctrl & OTG_BSESSEND))
1442                 return -EINVAL;
1443
1444         otg_ctrl |= OTG_B_BUSREQ;
1445         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1446         omap_writel(otg_ctrl, OTG_CTRL);
1447         isp->otg.state = OTG_STATE_B_SRP_INIT;
1448
1449         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1450                         omap_readl(OTG_CTRL));
1451 #ifdef  CONFIG_USB_OTG
1452         check_state(isp, __func__);
1453 #endif
1454         return 0;
1455 }
1456
1457 static int
1458 isp1301_start_hnp(struct otg_transceiver *dev)
1459 {
1460 #ifdef  CONFIG_USB_OTG
1461         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1462         u32 l;
1463
1464         if (!dev || isp != the_transceiver)
1465                 return -ENODEV;
1466         if (isp->otg.default_a && (isp->otg.host == NULL
1467                         || !isp->otg.host->b_hnp_enable))
1468                 return -ENOTCONN;
1469         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1470                         || !isp->otg.gadget->b_hnp_enable))
1471                 return -ENOTCONN;
1472
1473         /* We want hardware to manage most HNP protocol timings.
1474          * So do this part as early as possible...
1475          */
1476         switch (isp->otg.state) {
1477         case OTG_STATE_B_HOST:
1478                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1479                 /* caller will suspend next */
1480                 break;
1481         case OTG_STATE_A_HOST:
1482 #if 0
1483                 /* autoconnect mode avoids irq latency bugs */
1484                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1485                                 MC1_BDIS_ACON_EN);
1486 #endif
1487                 /* caller must suspend then clear A_BUSREQ */
1488                 usb_gadget_vbus_connect(isp->otg.gadget);
1489                 l = omap_readl(OTG_CTRL);
1490                 l |= OTG_A_SETB_HNPEN;
1491                 omap_writel(l, OTG_CTRL);
1492
1493                 break;
1494         case OTG_STATE_A_PERIPHERAL:
1495                 /* initiated by B-Host suspend */
1496                 break;
1497         default:
1498                 return -EILSEQ;
1499         }
1500         pr_debug("otg: HNP %s, %06x ...\n",
1501                 state_name(isp), omap_readl(OTG_CTRL));
1502         check_state(isp, __func__);
1503         return 0;
1504 #else
1505         /* srp-only */
1506         return -EINVAL;
1507 #endif
1508 }
1509
1510 /*-------------------------------------------------------------------------*/
1511
1512 /* no error returns, they'd just make bus scanning stop */
1513 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1514 {
1515         int                     status;
1516         struct isp1301          *isp;
1517         struct i2c_client       *i2c;
1518
1519         if (the_transceiver)
1520                 return 0;
1521
1522         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1523         if (!isp)
1524                 return 0;
1525
1526         INIT_WORK(&isp->work, isp1301_work);
1527         init_timer(&isp->timer);
1528         isp->timer.function = isp1301_timer;
1529         isp->timer.data = (unsigned long) isp;
1530
1531         isp->irq = -1;
1532         isp->c.addr = address;
1533         i2c_set_clientdata(&isp->c, isp);
1534         isp->c.adapter = bus;
1535         isp->c.driver = &isp1301_driver;
1536         strlcpy(isp->c.name, DRIVER_NAME, I2C_NAME_SIZE);
1537         isp->client = i2c = &isp->c;
1538
1539         /* if this is a true probe, verify the chip ... */
1540         if (kind < 0) {
1541                 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1542                 if (status != I2C_VENDOR_ID_PHILIPS) {
1543                         dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1544                                 address, status);
1545                         goto fail1;
1546                 }
1547                 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1548                 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1549                         dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1550                                 address, status);
1551                         goto fail1;
1552                 }
1553         }
1554
1555         status = i2c_attach_client(i2c);
1556         if (status < 0) {
1557                 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1558                                 DRIVER_NAME, address, status);
1559 fail1:
1560                 kfree(isp);
1561                 return 0;
1562         }
1563         isp->i2c_release = i2c->dev.release;
1564         i2c->dev.release = isp1301_release;
1565
1566         /* initial development used chiprev 2.00 */
1567         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1568         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1569                 status >> 8, status & 0xff);
1570
1571         /* make like power-on reset */
1572         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1573
1574         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1575         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1576
1577         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1578                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1579         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1580                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1581
1582         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1583         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1584         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1585
1586 #ifdef  CONFIG_USB_OTG
1587         status = otg_bind(isp);
1588         if (status < 0) {
1589                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1590                 goto fail2;
1591         }
1592 #endif
1593
1594         if (machine_is_omap_h2()) {
1595                 /* full speed signaling by default */
1596                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1597                         MC1_SPEED);
1598                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1599                         MC2_SPD_SUSP_CTRL);
1600
1601                 /* IRQ wired at M14 */
1602                 omap_cfg_reg(M14_1510_GPIO2);
1603                 isp->irq = OMAP_GPIO_IRQ(2);
1604                 if (gpio_request(2, "isp1301") == 0)
1605                         gpio_direction_input(2);
1606                 isp->irq_type = IRQF_TRIGGER_FALLING;
1607         }
1608
1609         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1610         status = request_irq(isp->irq, isp1301_irq,
1611                         isp->irq_type, DRIVER_NAME, isp);
1612         if (status < 0) {
1613                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1614                                 isp->irq, status);
1615 #ifdef  CONFIG_USB_OTG
1616 fail2:
1617 #endif
1618                 i2c_detach_client(i2c);
1619                 goto fail1;
1620         }
1621
1622         isp->otg.dev = &isp->client->dev;
1623         isp->otg.label = DRIVER_NAME;
1624
1625         isp->otg.set_host = isp1301_set_host,
1626         isp->otg.set_peripheral = isp1301_set_peripheral,
1627         isp->otg.set_power = isp1301_set_power,
1628         isp->otg.start_srp = isp1301_start_srp,
1629         isp->otg.start_hnp = isp1301_start_hnp,
1630
1631         enable_vbus_draw(isp, 0);
1632         power_down(isp);
1633         the_transceiver = isp;
1634
1635 #ifdef  CONFIG_USB_OTG
1636         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1637         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1638 #endif
1639
1640         dump_regs(isp, __func__);
1641
1642 #ifdef  VERBOSE
1643         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1644         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1645 #endif
1646
1647         status = otg_set_transceiver(&isp->otg);
1648         if (status < 0)
1649                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1650                         status);
1651
1652         return 0;
1653 }
1654
1655 static int isp1301_scan_bus(struct i2c_adapter *bus)
1656 {
1657         if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1658                         | I2C_FUNC_SMBUS_READ_WORD_DATA))
1659                 return -EINVAL;
1660         return i2c_probe(bus, &addr_data, isp1301_probe);
1661 }
1662
1663 static struct i2c_driver isp1301_driver = {
1664         .driver = {
1665                 .name   = "isp1301_omap",
1666         },
1667         .attach_adapter = isp1301_scan_bus,
1668         .detach_client  = isp1301_detach_client,
1669 };
1670
1671 /*-------------------------------------------------------------------------*/
1672
1673 static int __init isp_init(void)
1674 {
1675         return i2c_add_driver(&isp1301_driver);
1676 }
1677 module_init(isp_init);
1678
1679 static void __exit isp_exit(void)
1680 {
1681         if (the_transceiver)
1682                 otg_set_transceiver(0);
1683         i2c_del_driver(&isp1301_driver);
1684 }
1685 module_exit(isp_exit);
1686