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_REG */
  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_REG           (1 << 0)
 190 #       define  MC1_SUSPEND_REG         (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_REG);
 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_REG);
 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         if (isp->otg.state == OTG_STATE_A_IDLE)
 364                 return;
 365
 366         isp->otg.default_a = 1;
 367         if (isp->otg.host) {
 368                 isp->otg.host->is_b_host = 0;
 369                 host_suspend(isp);
 370         }
 371         if (isp->otg.gadget) {
 372                 isp->otg.gadget->is_a_peripheral = 1;
 373                 gadget_suspend(isp);
 374         }
 375         isp->otg.state = OTG_STATE_A_IDLE;
 376         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 377         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 378 }
 379
 380 /* called from irq handlers */
 381 static void b_idle(struct isp1301 *isp, const char *tag)
 382 {
 383         if (isp->otg.state == OTG_STATE_B_IDLE)
 384                 return;
 385
 386         isp->otg.default_a = 0;
 387         if (isp->otg.host) {
 388                 isp->otg.host->is_b_host = 1;
 389                 host_suspend(isp);
 390         }
 391         if (isp->otg.gadget) {
 392                 isp->otg.gadget->is_a_peripheral = 0;
 393                 gadget_suspend(isp);
 394         }
 395         isp->otg.state = OTG_STATE_B_IDLE;
 396         isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 397         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 398 }
 399
 400 static void
 401 dump_regs(struct isp1301 *isp, const char *label)
 402 {
 403 #ifdef  DEBUG
 404         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 405         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 406         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 407
 408         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 409                 OTG_CTRL_REG, label, state_name(isp),
 410                 ctrl, status, src);
 411         /* mode control and irq enables don't change much */
 412 #endif
 413 }
 414
 415 /*-------------------------------------------------------------------------*/
 416
 417 #ifdef  CONFIG_USB_OTG
 418
 419 /*
 420  * The OMAP OTG controller handles most of the OTG state transitions.
 421  *
 422  * We translate isp1301 outputs (mostly voltage comparator status) into
 423  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 424  * flags into isp1301 inputs ... and infer state transitions.
 425  */
 426
 427 #ifdef  VERBOSE
 428
 429 static void check_state(struct isp1301 *isp, const char *tag)
 430 {
 431         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 432         u8                      fsm = OTG_TEST_REG & 0x0ff;
 433         unsigned                extra = 0;
 434
 435         switch (fsm) {
 436
 437         /* default-b */
 438         case 0x0:
 439                 state = OTG_STATE_B_IDLE;
 440                 break;
 441         case 0x3:
 442         case 0x7:
 443                 extra = 1;
 444         case 0x1:
 445                 state = OTG_STATE_B_PERIPHERAL;
 446                 break;
 447         case 0x11:
 448                 state = OTG_STATE_B_SRP_INIT;
 449                 break;
 450
 451         /* extra dual-role default-b states */
 452         case 0x12:
 453         case 0x13:
 454         case 0x16:
 455                 extra = 1;
 456         case 0x17:
 457                 state = OTG_STATE_B_WAIT_ACON;
 458                 break;
 459         case 0x34:
 460                 state = OTG_STATE_B_HOST;
 461                 break;
 462
 463         /* default-a */
 464         case 0x36:
 465                 state = OTG_STATE_A_IDLE;
 466                 break;
 467         case 0x3c:
 468                 state = OTG_STATE_A_WAIT_VFALL;
 469                 break;
 470         case 0x7d:
 471                 state = OTG_STATE_A_VBUS_ERR;
 472                 break;
 473         case 0x9e:
 474         case 0x9f:
 475                 extra = 1;
 476         case 0x89:
 477                 state = OTG_STATE_A_PERIPHERAL;
 478                 break;
 479         case 0xb7:
 480                 state = OTG_STATE_A_WAIT_VRISE;
 481                 break;
 482         case 0xb8:
 483                 state = OTG_STATE_A_WAIT_BCON;
 484                 break;
 485         case 0xb9:
 486                 state = OTG_STATE_A_HOST;
 487                 break;
 488         case 0xba:
 489                 state = OTG_STATE_A_SUSPEND;
 490                 break;
 491         default:
 492                 break;
 493         }
 494         if (isp->otg.state == state && !extra)
 495                 return;
 496         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 497                 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
 498 }
 499
 500 #else
 501
 502 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 503
 504 #endif
 505
 506 /* outputs from ISP1301_INTERRUPT_SOURCE */
 507 static void update_otg1(struct isp1301 *isp, u8 int_src)
 508 {
 509         u32     otg_ctrl;
 510
 511         otg_ctrl = OTG_CTRL_REG
 512                         & OTG_CTRL_MASK
 513                         & ~OTG_XCEIV_INPUTS
 514                         & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 515         if (int_src & INTR_SESS_VLD)
 516                 otg_ctrl |= OTG_ASESSVLD;
 517         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 518                 a_idle(isp, "vfall");
 519                 otg_ctrl &= ~OTG_CTRL_BITS;
 520         }
 521         if (int_src & INTR_VBUS_VLD)
 522                 otg_ctrl |= OTG_VBUSVLD;
 523         if (int_src & INTR_ID_GND) {            /* default-A */
 524                 if (isp->otg.state == OTG_STATE_B_IDLE
 525                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 526                         a_idle(isp, "init");
 527                         return;
 528                 }
 529         } else {                                /* default-B */
 530                 otg_ctrl |= OTG_ID;
 531                 if (isp->otg.state == OTG_STATE_A_IDLE
 532                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 533                         b_idle(isp, "init");
 534                         return;
 535                 }
 536         }
 537         OTG_CTRL_REG = otg_ctrl;
 538 }
 539
 540 /* outputs from ISP1301_OTG_STATUS */
 541 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 542 {
 543         u32     otg_ctrl;
 544
 545         otg_ctrl = OTG_CTRL_REG
 546                         & OTG_CTRL_MASK
 547                         & ~OTG_XCEIV_INPUTS
 548                         & ~(OTG_BSESSVLD|OTG_BSESSEND);
 549         if (otg_status & OTG_B_SESS_VLD)
 550                 otg_ctrl |= OTG_BSESSVLD;
 551         else if (otg_status & OTG_B_SESS_END)
 552                 otg_ctrl |= OTG_BSESSEND;
 553         OTG_CTRL_REG = otg_ctrl;
 554 }
 555
 556 /* inputs going to ISP1301 */
 557 static void otg_update_isp(struct isp1301 *isp)
 558 {
 559         u32     otg_ctrl, otg_change;
 560         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 561
 562         otg_ctrl = OTG_CTRL_REG;
 563         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 564         isp->last_otg_ctrl = otg_ctrl;
 565         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 566
 567         switch (isp->otg.state) {
 568         case OTG_STATE_B_IDLE:
 569         case OTG_STATE_B_PERIPHERAL:
 570         case OTG_STATE_B_SRP_INIT:
 571                 if (!(otg_ctrl & OTG_PULLUP)) {
 572                         // if (otg_ctrl & OTG_B_HNPEN) {
 573                         if (isp->otg.gadget->b_hnp_enable) {
 574                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 575                                 pr_debug("  --> b_wait_acon\n");
 576                         }
 577                         goto pulldown;
 578                 }
 579 pullup:
 580                 set |= OTG1_DP_PULLUP;
 581                 clr |= OTG1_DP_PULLDOWN;
 582                 break;
 583         case OTG_STATE_A_SUSPEND:
 584         case OTG_STATE_A_PERIPHERAL:
 585                 if (otg_ctrl & OTG_PULLUP)
 586                         goto pullup;
 587                 /* FALLTHROUGH */
 588         // case OTG_STATE_B_WAIT_ACON:
 589         default:
 590 pulldown:
 591                 set |= OTG1_DP_PULLDOWN;
 592                 clr |= OTG1_DP_PULLUP;
 593                 break;
 594         }
 595
 596 #       define toggle(OTG,ISP) do { \
 597                 if (otg_ctrl & OTG) set |= ISP; \
 598                 else clr |= ISP; \
 599                 } while (0)
 600
 601         if (!(isp->otg.host))
 602                 otg_ctrl &= ~OTG_DRV_VBUS;
 603
 604         switch (isp->otg.state) {
 605         case OTG_STATE_A_SUSPEND:
 606                 if (otg_ctrl & OTG_DRV_VBUS) {
 607                         set |= OTG1_VBUS_DRV;
 608                         break;
 609                 }
 610                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 611                 notresponding(isp);
 612
 613                 /* FALLTHROUGH */
 614         case OTG_STATE_A_VBUS_ERR:
 615                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 616                 pr_debug("  --> a_wait_vfall\n");
 617                 /* FALLTHROUGH */
 618         case OTG_STATE_A_WAIT_VFALL:
 619                 /* FIXME usbcore thinks port power is still on ... */
 620                 clr |= OTG1_VBUS_DRV;
 621                 break;
 622         case OTG_STATE_A_IDLE:
 623                 if (otg_ctrl & OTG_DRV_VBUS) {
 624                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 625                         pr_debug("  --> a_wait_vrise\n");
 626                 }
 627                 /* FALLTHROUGH */
 628         default:
 629                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 630         }
 631
 632         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 633         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 634
 635 #       undef toggle
 636
 637         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 638         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 639
 640         /* HNP switch to host or peripheral; and SRP */
 641         if (otg_change & OTG_PULLUP) {
 642                 switch (isp->otg.state) {
 643                 case OTG_STATE_B_IDLE:
 644                         if (clr & OTG1_DP_PULLUP)
 645                                 break;
 646                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 647                         pr_debug("  --> b_peripheral\n");
 648                         break;
 649                 case OTG_STATE_A_SUSPEND:
 650                         if (clr & OTG1_DP_PULLUP)
 651                                 break;
 652                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 653                         pr_debug("  --> a_peripheral\n");
 654                         break;
 655                 default:
 656                         break;
 657                 }
 658                 OTG_CTRL_REG |= OTG_PULLUP;
 659         }
 660
 661         check_state(isp, __func__);
 662         dump_regs(isp, "otg->isp1301");
 663 }
 664
 665 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 666 {
 667         u16             otg_irq = OTG_IRQ_SRC_REG;
 668         u32             otg_ctrl;
 669         int             ret = IRQ_NONE;
 670         struct isp1301  *isp = _isp;
 671
 672         /* update ISP1301 transciever from OTG controller */
 673         if (otg_irq & OPRT_CHG) {
 674                 OTG_IRQ_SRC_REG = OPRT_CHG;
 675                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 676                 ret = IRQ_HANDLED;
 677
 678         /* SRP to become b_peripheral failed */
 679         } else if (otg_irq & B_SRP_TMROUT) {
 680                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
 681                 notresponding(isp);
 682
 683                 /* gadget drivers that care should monitor all kinds of
 684                  * remote wakeup (SRP, normal) using their own timer
 685                  * to give "check cable and A-device" messages.
 686                  */
 687                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 688                         b_idle(isp, "srp_timeout");
 689
 690                 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
 691                 ret = IRQ_HANDLED;
 692
 693         /* HNP to become b_host failed */
 694         } else if (otg_irq & B_HNP_FAIL) {
 695                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 696                                 state_name(isp), OTG_CTRL_REG);
 697                 notresponding(isp);
 698
 699                 otg_ctrl = OTG_CTRL_REG;
 700                 otg_ctrl |= OTG_BUSDROP;
 701                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 702                 OTG_CTRL_REG = otg_ctrl;
 703
 704                 /* subset of b_peripheral()... */
 705                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 706                 pr_debug("  --> b_peripheral\n");
 707
 708                 OTG_IRQ_SRC_REG = B_HNP_FAIL;
 709                 ret = IRQ_HANDLED;
 710
 711         /* detect SRP from B-device ... */
 712         } else if (otg_irq & A_SRP_DETECT) {
 713                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 714                                 state_name(isp), OTG_CTRL_REG);
 715
 716                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 717                 switch (isp->otg.state) {
 718                 case OTG_STATE_A_IDLE:
 719                         if (!isp->otg.host)
 720                                 break;
 721                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 722                         otg_ctrl = OTG_CTRL_REG;
 723                         otg_ctrl |= OTG_A_BUSREQ;
 724                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 725                                         & ~OTG_XCEIV_INPUTS
 726                                         & OTG_CTRL_MASK;
 727                         OTG_CTRL_REG = otg_ctrl;
 728                         break;
 729                 default:
 730                         break;
 731                 }
 732
 733                 OTG_IRQ_SRC_REG = A_SRP_DETECT;
 734                 ret = IRQ_HANDLED;
 735
 736         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 737          * we don't track them separately
 738          */
 739         } else if (otg_irq & A_REQ_TMROUT) {
 740                 otg_ctrl = OTG_CTRL_REG;
 741                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 742                                 state_name(isp), otg_ctrl);
 743                 notresponding(isp);
 744
 745                 otg_ctrl |= OTG_BUSDROP;
 746                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 747                 OTG_CTRL_REG = otg_ctrl;
 748                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 749
 750                 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
 751                 ret = IRQ_HANDLED;
 752
 753         /* A-supplied voltage fell too low; overcurrent */
 754         } else if (otg_irq & A_VBUS_ERR) {
 755                 otg_ctrl = OTG_CTRL_REG;
 756                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 757                         state_name(isp), otg_irq, otg_ctrl);
 758
 759                 otg_ctrl |= OTG_BUSDROP;
 760                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 761                 OTG_CTRL_REG = otg_ctrl;
 762                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 763
 764                 OTG_IRQ_SRC_REG = A_VBUS_ERR;
 765                 ret = IRQ_HANDLED;
 766
 767         /* switch driver; the transciever code activates it,
 768          * ungating the udc clock or resuming OHCI.
 769          */
 770         } else if (otg_irq & DRIVER_SWITCH) {
 771                 int     kick = 0;
 772
 773                 otg_ctrl = OTG_CTRL_REG;
 774                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 775                                 state_name(isp),
 776                                 (otg_ctrl & OTG_DRIVER_SEL)
 777                                         ? "gadget" : "host",
 778                                 otg_ctrl);
 779                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 780
 781                 /* role is peripheral */
 782                 if (otg_ctrl & OTG_DRIVER_SEL) {
 783                         switch (isp->otg.state) {
 784                         case OTG_STATE_A_IDLE:
 785                                 b_idle(isp, __func__);
 786                                 break;
 787                         default:
 788                                 break;
 789                         }
 790                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 791
 792                 /* role is host */
 793                 } else {
 794                         if (!(otg_ctrl & OTG_ID)) {
 795                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 796                                 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
 797                         }
 798
 799                         if (isp->otg.host) {
 800                                 switch (isp->otg.state) {
 801                                 case OTG_STATE_B_WAIT_ACON:
 802                                         isp->otg.state = OTG_STATE_B_HOST;
 803                                         pr_debug("  --> b_host\n");
 804                                         kick = 1;
 805                                         break;
 806                                 case OTG_STATE_A_WAIT_BCON:
 807                                         isp->otg.state = OTG_STATE_A_HOST;
 808                                         pr_debug("  --> a_host\n");
 809                                         break;
 810                                 case OTG_STATE_A_PERIPHERAL:
 811                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 812                                         pr_debug("  --> a_wait_bcon\n");
 813                                         break;
 814                                 default:
 815                                         break;
 816                                 }
 817                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 818                         }
 819                 }
 820
 821                 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
 822                 ret = IRQ_HANDLED;
 823
 824                 if (kick)
 825                         usb_bus_start_enum(isp->otg.host,
 826                                                 isp->otg.host->otg_port);
 827         }
 828
 829         check_state(isp, __func__);
 830         return ret;
 831 }
 832
 833 static struct platform_device *otg_dev;
 834
 835 static int otg_init(struct isp1301 *isp)
 836 {
 837         if (!otg_dev)
 838                 return -ENODEV;
 839
 840         dump_regs(isp, __func__);
 841         /* some of these values are board-specific... */
 842         OTG_SYSCON_2_REG |= OTG_EN
 843                 /* for B-device: */
 844                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 845                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 846                 // | (3 << 24)          /* 2msec VBUS pulse */
 847                 /* for A-device: */
 848                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 849                 | SRP_DPW               /* detect 167+ns SRP pulses */
 850                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 851                 ;
 852
 853         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 854         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 855
 856         check_state(isp, __func__);
 857         pr_debug("otg: %s, %s %06x\n",
 858                         state_name(isp), __func__, OTG_CTRL_REG);
 859
 860         OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
 861                         | B_SRP_TMROUT | B_HNP_FAIL
 862                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
 863         OTG_SYSCON_2_REG |= OTG_EN;
 864
 865         return 0;
 866 }
 867
 868 static int otg_probe(struct platform_device *dev)
 869 {
 870         // struct omap_usb_config *config = dev->platform_data;
 871
 872         otg_dev = dev;
 873         return 0;
 874 }
 875
 876 static int otg_remove(struct platform_device *dev)
 877 {
 878         otg_dev = 0;
 879         return 0;
 880 }
 881
 882 struct platform_driver omap_otg_driver = {
 883         .probe          = otg_probe,
 884         .remove         = otg_remove,
 885         .driver         = {
 886                 .owner  = THIS_MODULE,
 887                 .name   = "omap_otg",
 888         },
 889 };
 890
 891 static int otg_bind(struct isp1301 *isp)
 892 {
 893         int     status;
 894
 895         if (otg_dev)
 896                 return -EBUSY;
 897
 898         status = platform_driver_register(&omap_otg_driver);
 899         if (status < 0)
 900                 return status;
 901
 902         if (otg_dev)
 903                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 904                                 IRQF_DISABLED, DRIVER_NAME, isp);
 905         else
 906                 status = -ENODEV;
 907
 908         if (status < 0)
 909                 platform_driver_unregister(&omap_otg_driver);
 910         return status;
 911 }
 912
 913 static void otg_unbind(struct isp1301 *isp)
 914 {
 915         if (!otg_dev)
 916                 return;
 917         free_irq(otg_dev->resource[1].start, isp);
 918 }
 919
 920 #else
 921
 922 /* OTG controller isn't clocked */
 923
 924 #endif  /* CONFIG_USB_OTG */
 925
 926 /*-------------------------------------------------------------------------*/
 927
 928 static void b_peripheral(struct isp1301 *isp)
 929 {
 930         OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
 931         usb_gadget_vbus_connect(isp->otg.gadget);
 932
 933 #ifdef  CONFIG_USB_OTG
 934         enable_vbus_draw(isp, 8);
 935         otg_update_isp(isp);
 936 #else
 937         enable_vbus_draw(isp, 100);
 938         /* UDC driver just set OTG_BSESSVLD */
 939         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 940         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 941         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 942         pr_debug("  --> b_peripheral\n");
 943         dump_regs(isp, "2periph");
 944 #endif
 945 }
 946
 947 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 948 {
 949         u8                      isp_stat, isp_bstat;
 950         enum usb_otg_state      state = isp->otg.state;
 951
 952         if (stat & INTR_BDIS_ACON)
 953                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 954
 955         /* start certain state transitions right away */
 956         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 957         if (isp_stat & INTR_ID_GND) {
 958                 if (isp->otg.default_a) {
 959                         switch (state) {
 960                         case OTG_STATE_B_IDLE:
 961                                 a_idle(isp, "idle");
 962                                 /* FALLTHROUGH */
 963                         case OTG_STATE_A_IDLE:
 964                                 enable_vbus_source(isp);
 965                                 /* FALLTHROUGH */
 966                         case OTG_STATE_A_WAIT_VRISE:
 967                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 968                                  * the HC will transition to A_HOST (or
 969                                  * A_SUSPEND!) without our noticing except
 970                                  * when HNP is used.
 971                                  */
 972                                 if (isp_stat & INTR_VBUS_VLD)
 973                                         isp->otg.state = OTG_STATE_A_HOST;
 974                                 break;
 975                         case OTG_STATE_A_WAIT_VFALL:
 976                                 if (!(isp_stat & INTR_SESS_VLD))
 977                                         a_idle(isp, "vfell");
 978                                 break;
 979                         default:
 980                                 if (!(isp_stat & INTR_VBUS_VLD))
 981                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
 982                                 break;
 983                         }
 984                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 985                 } else {
 986                         switch (state) {
 987                         case OTG_STATE_B_PERIPHERAL:
 988                         case OTG_STATE_B_HOST:
 989                         case OTG_STATE_B_WAIT_ACON:
 990                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
 991                                 break;
 992                         default:
 993                                 break;
 994                         }
 995                         if (state != OTG_STATE_A_IDLE)
 996                                 a_idle(isp, "id");
 997                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
 998                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 999                         isp_bstat = 0;
1000                 }
1001         } else {
1002                 /* if user unplugged mini-A end of cable,
1003                  * don't bypass A_WAIT_VFALL.
1004                  */
1005                 if (isp->otg.default_a) {
1006                         switch (state) {
1007                         default:
1008                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1009                                 break;
1010                         case OTG_STATE_A_WAIT_VFALL:
1011                                 state = OTG_STATE_A_IDLE;
1012                                 /* khubd may take a while to notice and
1013                                  * handle this disconnect, so don't go
1014                                  * to B_IDLE quite yet.
1015                                  */
1016                                 break;
1017                         case OTG_STATE_A_IDLE:
1018                                 host_suspend(isp);
1019                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1020                                                 MC1_BDIS_ACON_EN);
1021                                 isp->otg.state = OTG_STATE_B_IDLE;
1022                                 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1023                                                 & ~OTG_CTRL_BITS;
1024                                 break;
1025                         case OTG_STATE_B_IDLE:
1026                                 break;
1027                         }
1028                 }
1029                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1030
1031                 switch (isp->otg.state) {
1032                 case OTG_STATE_B_PERIPHERAL:
1033                 case OTG_STATE_B_WAIT_ACON:
1034                 case OTG_STATE_B_HOST:
1035                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1036                                 break;
1037                         enable_vbus_draw(isp, 0);
1038 #ifndef CONFIG_USB_OTG
1039                         /* UDC driver will clear OTG_BSESSVLD */
1040                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1041                                                 OTG1_DP_PULLDOWN);
1042                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1043                                                 OTG1_DP_PULLUP);
1044                         dump_regs(isp, __func__);
1045 #endif
1046                         /* FALLTHROUGH */
1047                 case OTG_STATE_B_SRP_INIT:
1048                         b_idle(isp, __func__);
1049                         OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1050                         /* FALLTHROUGH */
1051                 case OTG_STATE_B_IDLE:
1052                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1053 #ifdef  CONFIG_USB_OTG
1054                                 update_otg1(isp, isp_stat);
1055                                 update_otg2(isp, isp_bstat);
1056 #endif
1057                                 b_peripheral(isp);
1058                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1059                                 isp_bstat |= OTG_B_SESS_END;
1060                         break;
1061                 case OTG_STATE_A_WAIT_VFALL:
1062                         break;
1063                 default:
1064                         pr_debug("otg: unsupported b-device %s\n",
1065                                 state_name(isp));
1066                         break;
1067                 }
1068         }
1069
1070         if (state != isp->otg.state)
1071                 pr_debug("  isp, %s -> %s\n",
1072                                 state_string(state), state_name(isp));
1073
1074 #ifdef  CONFIG_USB_OTG
1075         /* update the OTG controller state to match the isp1301; may
1076          * trigger OPRT_CHG irqs for changes going to the isp1301.
1077          */
1078         update_otg1(isp, isp_stat);
1079         update_otg2(isp, isp_bstat);
1080         check_state(isp, __func__);
1081 #endif
1082
1083         dump_regs(isp, "isp1301->otg");
1084 }
1085
1086 /*-------------------------------------------------------------------------*/
1087
1088 static u8 isp1301_clear_latch(struct isp1301 *isp)
1089 {
1090         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1091         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1092         return latch;
1093 }
1094
1095 static void
1096 isp1301_work(struct work_struct *work)
1097 {
1098         struct isp1301  *isp = container_of(work, struct isp1301, work);
1099         int             stop;
1100
1101         /* implicit lock:  we're the only task using this device */
1102         isp->working = 1;
1103         do {
1104                 stop = test_bit(WORK_STOP, &isp->todo);
1105
1106 #ifdef  CONFIG_USB_OTG
1107                 /* transfer state from otg engine to isp1301 */
1108                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1109                         otg_update_isp(isp);
1110                         put_device(&isp->client.dev);
1111                 }
1112 #endif
1113                 /* transfer state from isp1301 to otg engine */
1114                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1115                         u8              stat = isp1301_clear_latch(isp);
1116
1117                         isp_update_otg(isp, stat);
1118                         put_device(&isp->client.dev);
1119                 }
1120
1121                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1122                         u32     otg_ctrl;
1123
1124                         /*
1125                          * skip A_WAIT_VRISE; hc transitions invisibly
1126                          * skip A_WAIT_BCON; same.
1127                          */
1128                         switch (isp->otg.state) {
1129                         case OTG_STATE_A_WAIT_BCON:
1130                         case OTG_STATE_A_WAIT_VRISE:
1131                                 isp->otg.state = OTG_STATE_A_HOST;
1132                                 pr_debug("  --> a_host\n");
1133                                 otg_ctrl = OTG_CTRL_REG;
1134                                 otg_ctrl |= OTG_A_BUSREQ;
1135                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1136                                                 & OTG_CTRL_MASK;
1137                                 OTG_CTRL_REG = otg_ctrl;
1138                                 break;
1139                         case OTG_STATE_B_WAIT_ACON:
1140                                 isp->otg.state = OTG_STATE_B_HOST;
1141                                 pr_debug("  --> b_host (acon)\n");
1142                                 break;
1143                         case OTG_STATE_B_HOST:
1144                         case OTG_STATE_B_IDLE:
1145                         case OTG_STATE_A_IDLE:
1146                                 break;
1147                         default:
1148                                 pr_debug("  host resume in %s\n",
1149                                                 state_name(isp));
1150                         }
1151                         host_resume(isp);
1152                         // mdelay(10);
1153                         put_device(&isp->client.dev);
1154                 }
1155
1156                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1157 #ifdef  VERBOSE
1158                         dump_regs(isp, "timer");
1159                         if (!stop)
1160                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1161 #endif
1162                         put_device(&isp->client.dev);
1163                 }
1164
1165                 if (isp->todo)
1166                         dev_vdbg(&isp->client.dev,
1167                                 "work done, todo = 0x%lx\n",
1168                                 isp->todo);
1169                 if (stop) {
1170                         dev_dbg(&isp->client.dev, "stop\n");
1171                         break;
1172                 }
1173         } while (isp->todo);
1174         isp->working = 0;
1175 }
1176
1177 static irqreturn_t isp1301_irq(int irq, void *isp)
1178 {
1179         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1180         return IRQ_HANDLED;
1181 }
1182
1183 static void isp1301_timer(unsigned long _isp)
1184 {
1185         isp1301_defer_work((void *)_isp, WORK_TIMER);
1186 }
1187
1188 /*-------------------------------------------------------------------------*/
1189
1190 static void isp1301_release(struct device *dev)
1191 {
1192         struct isp1301  *isp;
1193
1194         isp = container_of(dev, struct isp1301, client.dev);
1195
1196         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1197         if (isp->i2c_release)
1198                 isp->i2c_release(dev);
1199         kfree (isp);
1200 }
1201
1202 static struct isp1301 *the_transceiver;
1203
1204 static int isp1301_detach_client(struct i2c_client *i2c)
1205 {
1206         struct isp1301  *isp;
1207
1208         isp = container_of(i2c, struct isp1301, client);
1209
1210         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1211         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1212         free_irq(isp->irq, isp);
1213 #ifdef  CONFIG_USB_OTG
1214         otg_unbind(isp);
1215 #endif
1216         if (machine_is_omap_h2())
1217                 omap_free_gpio(2);
1218
1219         isp->timer.data = 0;
1220         set_bit(WORK_STOP, &isp->todo);
1221         del_timer_sync(&isp->timer);
1222         flush_scheduled_work();
1223
1224         put_device(&i2c->dev);
1225         the_transceiver = 0;
1226
1227         return i2c_detach_client(i2c);
1228 }
1229
1230 /*-------------------------------------------------------------------------*/
1231
1232 /* NOTE:  three modes are possible here, only one of which
1233  * will be standards-conformant on any given system:
1234  *
1235  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1236  *  - HOST mode, for when there's one or more A (host) connectors
1237  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1238  *
1239  * As a rule, you won't have an isp1301 chip unless it's there to
1240  * support the OTG mode.  Other modes help testing USB controllers
1241  * in isolation from (full) OTG support, or maybe so later board
1242  * revisions can help to support those feature.
1243  */
1244
1245 #ifdef  CONFIG_USB_OTG
1246
1247 static int isp1301_otg_enable(struct isp1301 *isp)
1248 {
1249         power_up(isp);
1250         otg_init(isp);
1251
1252         /* NOTE:  since we don't change this, this provides
1253          * a few more interrupts than are strictly needed.
1254          */
1255         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1256                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1257         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1258                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1259
1260         dev_info(&isp->client.dev, "ready for dual-role USB ...\n");
1261
1262         return 0;
1263 }
1264
1265 #endif
1266
1267 /* add or disable the host device+driver */
1268 static int
1269 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1270 {
1271         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1272
1273         if (!otg || isp != the_transceiver)
1274                 return -ENODEV;
1275
1276         if (!host) {
1277                 OTG_IRQ_EN_REG = 0;
1278                 power_down(isp);
1279                 isp->otg.host = 0;
1280                 return 0;
1281         }
1282
1283 #ifdef  CONFIG_USB_OTG
1284         isp->otg.host = host;
1285         dev_dbg(&isp->client.dev, "registered host\n");
1286         host_suspend(isp);
1287         if (isp->otg.gadget)
1288                 return isp1301_otg_enable(isp);
1289         return 0;
1290
1291 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1292         // FIXME update its refcount
1293         isp->otg.host = host;
1294
1295         power_up(isp);
1296
1297         if (machine_is_omap_h2())
1298                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1299
1300         dev_info(&isp->client.dev, "A-Host sessions ok\n");
1301         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1302                 INTR_ID_GND);
1303         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1304                 INTR_ID_GND);
1305
1306         /* If this has a Mini-AB connector, this mode is highly
1307          * nonstandard ... but can be handy for testing, especially with
1308          * the Mini-A end of an OTG cable.  (Or something nonstandard
1309          * like MiniB-to-StandardB, maybe built with a gender mender.)
1310          */
1311         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1312
1313         dump_regs(isp, __func__);
1314
1315         return 0;
1316
1317 #else
1318         dev_dbg(&isp->client.dev, "host sessions not allowed\n");
1319         return -EINVAL;
1320 #endif
1321
1322 }
1323
1324 static int
1325 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1326 {
1327         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1328
1329         if (!otg || isp != the_transceiver)
1330                 return -ENODEV;
1331
1332         if (!gadget) {
1333                 OTG_IRQ_EN_REG = 0;
1334                 if (!isp->otg.default_a)
1335                         enable_vbus_draw(isp, 0);
1336                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1337                 isp->otg.gadget = 0;
1338                 power_down(isp);
1339                 return 0;
1340         }
1341
1342 #ifdef  CONFIG_USB_OTG
1343         isp->otg.gadget = gadget;
1344         dev_dbg(&isp->client.dev, "registered gadget\n");
1345         /* gadget driver may be suspended until vbus_connect () */
1346         if (isp->otg.host)
1347                 return isp1301_otg_enable(isp);
1348         return 0;
1349
1350 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1351         isp->otg.gadget = gadget;
1352         // FIXME update its refcount
1353
1354         OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1355                                 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1356                         | OTG_ID;
1357         power_up(isp);
1358         isp->otg.state = OTG_STATE_B_IDLE;
1359
1360         if (machine_is_omap_h2())
1361                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1362
1363         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1364                 INTR_SESS_VLD);
1365         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1366                 INTR_VBUS_VLD);
1367         dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1368         dump_regs(isp, __func__);
1369
1370         /* If this has a Mini-AB connector, this mode is highly
1371          * nonstandard ... but can be handy for testing, so long
1372          * as you don't plug a Mini-A cable into the jack.
1373          */
1374         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1375                 b_peripheral(isp);
1376
1377         return 0;
1378
1379 #else
1380         dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1381         return -EINVAL;
1382 #endif
1383 }
1384
1385
1386 /*-------------------------------------------------------------------------*/
1387
1388 static int
1389 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1390 {
1391         if (!the_transceiver)
1392                 return -ENODEV;
1393         if (dev->state == OTG_STATE_B_PERIPHERAL)
1394                 enable_vbus_draw(the_transceiver, mA);
1395         return 0;
1396 }
1397
1398 static int
1399 isp1301_start_srp(struct otg_transceiver *dev)
1400 {
1401         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1402         u32             otg_ctrl;
1403
1404         if (!dev || isp != the_transceiver
1405                         || isp->otg.state != OTG_STATE_B_IDLE)
1406                 return -ENODEV;
1407
1408         otg_ctrl = OTG_CTRL_REG;
1409         if (!(otg_ctrl & OTG_BSESSEND))
1410                 return -EINVAL;
1411
1412         otg_ctrl |= OTG_B_BUSREQ;
1413         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1414         OTG_CTRL_REG = otg_ctrl;
1415         isp->otg.state = OTG_STATE_B_SRP_INIT;
1416
1417         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1418 #ifdef  CONFIG_USB_OTG
1419         check_state(isp, __func__);
1420 #endif
1421         return 0;
1422 }
1423
1424 static int
1425 isp1301_start_hnp(struct otg_transceiver *dev)
1426 {
1427 #ifdef  CONFIG_USB_OTG
1428         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1429
1430         if (!dev || isp != the_transceiver)
1431                 return -ENODEV;
1432         if (isp->otg.default_a && (isp->otg.host == NULL
1433                         || !isp->otg.host->b_hnp_enable))
1434                 return -ENOTCONN;
1435         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1436                         || !isp->otg.gadget->b_hnp_enable))
1437                 return -ENOTCONN;
1438
1439         /* We want hardware to manage most HNP protocol timings.
1440          * So do this part as early as possible...
1441          */
1442         switch (isp->otg.state) {
1443         case OTG_STATE_B_HOST:
1444                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1445                 /* caller will suspend next */
1446                 break;
1447         case OTG_STATE_A_HOST:
1448 #if 0
1449                 /* autoconnect mode avoids irq latency bugs */
1450                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1451                                 MC1_BDIS_ACON_EN);
1452 #endif
1453                 /* caller must suspend then clear A_BUSREQ */
1454                 usb_gadget_vbus_connect(isp->otg.gadget);
1455                 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1456
1457                 break;
1458         case OTG_STATE_A_PERIPHERAL:
1459                 /* initiated by B-Host suspend */
1460                 break;
1461         default:
1462                 return -EILSEQ;
1463         }
1464         pr_debug("otg: HNP %s, %06x ...\n",
1465                 state_name(isp), OTG_CTRL_REG);
1466         check_state(isp, __func__);
1467         return 0;
1468 #else
1469         /* srp-only */
1470         return -EINVAL;
1471 #endif
1472 }
1473
1474 /*-------------------------------------------------------------------------*/
1475
1476 /* no error returns, they'd just make bus scanning stop */
1477 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1478 {
1479         int                     status;
1480         struct isp1301          *isp;
1481         struct i2c_client       *i2c;
1482
1483         if (the_transceiver)
1484                 return 0;
1485
1486         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1487         if (!isp)
1488                 return 0;
1489
1490         INIT_WORK(&isp->work, isp1301_work);
1491         init_timer(&isp->timer);
1492         isp->timer.function = isp1301_timer;
1493         isp->timer.data = (unsigned long) isp;
1494
1495         isp->irq = -1;
1496         isp->client.addr = address;
1497         i2c_set_clientdata(&isp->client, isp);
1498         isp->client.adapter = bus;
1499         isp->client.driver = &isp1301_driver;
1500         strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1501         i2c = &isp->client;
1502
1503         /* if this is a true probe, verify the chip ... */
1504         if (kind < 0) {
1505                 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1506                 if (status != I2C_VENDOR_ID_PHILIPS) {
1507                         dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1508                                 address, status);
1509                         goto fail1;
1510                 }
1511                 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1512                 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1513                         dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1514                                 address, status);
1515                         goto fail1;
1516                 }
1517         }
1518
1519         status = i2c_attach_client(i2c);
1520         if (status < 0) {
1521                 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1522                                 DRIVER_NAME, address, status);
1523 fail1:
1524                 kfree(isp);
1525                 return 0;
1526         }
1527         isp->i2c_release = i2c->dev.release;
1528         i2c->dev.release = isp1301_release;
1529
1530         /* initial development used chiprev 2.00 */
1531         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1532         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1533                 status >> 8, status & 0xff);
1534
1535         /* make like power-on reset */
1536         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1537
1538         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1539         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1540
1541         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1542                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1543         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1544                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1545
1546         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1547         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1548         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1549
1550 #ifdef  CONFIG_USB_OTG
1551         status = otg_bind(isp);
1552         if (status < 0) {
1553                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1554                 goto fail2;
1555         }
1556 #endif
1557
1558         if (machine_is_omap_h2()) {
1559                 /* full speed signaling by default */
1560                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1561                         MC1_SPEED_REG);
1562                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1563                         MC2_SPD_SUSP_CTRL);
1564
1565                 /* IRQ wired at M14 */
1566                 omap_cfg_reg(M14_1510_GPIO2);
1567                 isp->irq = OMAP_GPIO_IRQ(2);
1568                 if (gpio_request(2, "isp1301") == 0)
1569                         gpio_direction_input(2);
1570                 isp->irq_type = IRQF_TRIGGER_FALLING;
1571         }
1572
1573         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1574         status = request_irq(isp->irq, isp1301_irq,
1575                         isp->irq_type, DRIVER_NAME, isp);
1576         if (status < 0) {
1577                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1578                                 isp->irq, status);
1579 #ifdef  CONFIG_USB_OTG
1580 fail2:
1581 #endif
1582                 i2c_detach_client(i2c);
1583                 goto fail1;
1584         }
1585
1586         isp->otg.dev = &isp->client.dev;
1587         isp->otg.label = DRIVER_NAME;
1588
1589         isp->otg.set_host = isp1301_set_host,
1590         isp->otg.set_peripheral = isp1301_set_peripheral,
1591         isp->otg.set_power = isp1301_set_power,
1592         isp->otg.start_srp = isp1301_start_srp,
1593         isp->otg.start_hnp = isp1301_start_hnp,
1594
1595         enable_vbus_draw(isp, 0);
1596         power_down(isp);
1597         the_transceiver = isp;
1598
1599 #ifdef  CONFIG_USB_OTG
1600         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1601         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1602 #endif
1603
1604         dump_regs(isp, __func__);
1605
1606 #ifdef  VERBOSE
1607         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1608         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1609 #endif
1610
1611         status = otg_set_transceiver(&isp->otg);
1612         if (status < 0)
1613                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1614                         status);
1615
1616         return 0;
1617 }
1618
1619 static int isp1301_scan_bus(struct i2c_adapter *bus)
1620 {
1621         if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1622                         | I2C_FUNC_SMBUS_READ_WORD_DATA))
1623                 return -EINVAL;
1624         return i2c_probe(bus, &addr_data, isp1301_probe);
1625 }
1626
1627 static struct i2c_driver isp1301_driver = {
1628         .driver = {
1629                 .name   = "isp1301_omap",
1630         },
1631         .attach_adapter = isp1301_scan_bus,
1632         .detach_client  = isp1301_detach_client,
1633 };
1634
1635 /*-------------------------------------------------------------------------*/
1636
1637 static int __init isp_init(void)
1638 {
1639         return i2c_add_driver(&isp1301_driver);
1640 }
1641 module_init(isp_init);
1642
1643 static void __exit isp_exit(void)
1644 {
1645         if (the_transceiver)
1646                 otg_set_transceiver(0);
1647         i2c_del_driver(&isp1301_driver);
1648 }
1649 module_exit(isp_exit);
1650