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/gpio.h>
  29 #include <linux/usb/ch9.h>
  30 #include <linux/usb/gadget.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/otg.h>
  33 #include <linux/i2c.h>
  34 #include <linux/workqueue.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/mach-types.h>
  38
  39 #include <mach/usb.h>
  40 #include <mach/mux.h>
  41
  42
  43 #ifndef DEBUG
  44 #undef  VERBOSE
  45 #endif
  46
  47
  48 #define DRIVER_VERSION  "24 August 2004"
  49 #define DRIVER_NAME     (isp1301_driver.driver.name)
  50
  51 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 struct isp1301 {
  55         struct otg_transceiver  otg;
  56         struct i2c_client       *client;
  57         void                    (*i2c_release)(struct device *dev);
  58
  59         int                     irq_type;
  60
  61         u32                     last_otg_ctrl;
  62         unsigned                working:1;
  63
  64         struct timer_list       timer;
  65
  66         /* use keventd context to change the state for us */
  67         struct work_struct      work;
  68
  69         unsigned long           todo;
  70 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  71 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  72 #               define WORK_HOST_RESUME 4       /* resume host */
  73 #               define WORK_TIMER       6       /* timer fired */
  74 #               define WORK_STOP        7       /* don't resubmit */
  75 };
  76
  77
  78 /* bits in OTG_CTRL */
  79
  80 #define OTG_XCEIV_OUTPUTS \
  81         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  82 #define OTG_XCEIV_INPUTS \
  83         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  84 #define OTG_CTRL_BITS \
  85         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  86         /* and OTG_PULLUP is sometimes written */
  87
  88 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  89         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  90         OTG_CTRL_BITS)
  91
  92
  93 /*-------------------------------------------------------------------------*/
  94
  95 /* board-specific PM hooks */
  96
  97 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  98
  99 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 100
 101 #include <linux/i2c/tps65010.h>
 102
 103 #else
 104
 105 static inline int tps65010_set_vbus_draw(unsigned mA)
 106 {
 107         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 108         return 0;
 109 }
 110
 111 #endif
 112
 113 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 114 {
 115         int status = tps65010_set_vbus_draw(mA);
 116         if (status < 0)
 117                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 118 }
 119
 120 static void enable_vbus_source(struct isp1301 *isp)
 121 {
 122         /* this board won't supply more than 8mA vbus power.
 123          * some boards can switch a 100ma "unit load" (or more).
 124          */
 125 }
 126
 127
 128 /* products will deliver OTG messages with LEDs, GUI, etc */
 129 static inline void notresponding(struct isp1301 *isp)
 130 {
 131         printk(KERN_NOTICE "OTG device not responding.\n");
 132 }
 133
 134
 135 #endif
 136
 137 #if defined(CONFIG_MACH_OMAP_H4)
 138
 139 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 140 {
 141         /* H4 controls this by DIP switch S2.4; no soft control.
 142          * ON means the charger is always enabled.  Leave it OFF
 143          * unless the OTG port is used only in B-peripheral mode.
 144          */
 145 }
 146
 147 static void enable_vbus_source(struct isp1301 *isp)
 148 {
 149         /* this board won't supply more than 8mA vbus power.
 150          * some boards can switch a 100ma "unit load" (or more).
 151          */
 152 }
 153
 154
 155 /* products will deliver OTG messages with LEDs, GUI, etc */
 156 static inline void notresponding(struct isp1301 *isp)
 157 {
 158         printk(KERN_NOTICE "OTG device not responding.\n");
 159 }
 160
 161
 162 #endif
 163
 164 /*-------------------------------------------------------------------------*/
 165
 166 static struct i2c_driver isp1301_driver;
 167
 168 /* smbus apis are used for portability */
 169
 170 static inline u8
 171 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 172 {
 173         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 174 }
 175
 176 static inline int
 177 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 178 {
 179         return i2c_smbus_read_word_data(isp->client, reg);
 180 }
 181
 182 static inline int
 183 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 184 {
 185         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 186 }
 187
 188 static inline int
 189 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 190 {
 191         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 192 }
 193
 194 /*-------------------------------------------------------------------------*/
 195
 196 /* identification */
 197 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 198 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 199 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 200
 201 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 202 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 203
 204 /* operational registers */
 205 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 206 #       define  MC1_SPEED               (1 << 0)
 207 #       define  MC1_SUSPEND             (1 << 1)
 208 #       define  MC1_DAT_SE0             (1 << 2)
 209 #       define  MC1_TRANSPARENT         (1 << 3)
 210 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 211 #       define  MC1_OE_INT_EN           (1 << 5)
 212 #       define  MC1_UART_EN             (1 << 6)
 213 #       define  MC1_MASK                0x7f
 214 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 215 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 216 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 217 #       define  MC2_BI_DI               (1 << 2)
 218 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 219 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 220 #       define  MC2_AUDIO_EN            (1 << 5)
 221 #       define  MC2_PSW_EN              (1 << 6)
 222 #       define  MC2_EN2V7               (1 << 7)
 223 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 224 #       define  OTG1_DP_PULLUP          (1 << 0)
 225 #       define  OTG1_DM_PULLUP          (1 << 1)
 226 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 227 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 228 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 229 #       define  OTG1_VBUS_DRV           (1 << 5)
 230 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 231 #       define  OTG1_VBUS_CHRG          (1 << 7)
 232 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 233 #       define  OTG_B_SESS_END          (1 << 6)
 234 #       define  OTG_B_SESS_VLD          (1 << 7)
 235
 236 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 237 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 238
 239 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 240 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 241
 242 /* same bitfields in all interrupt registers */
 243 #       define  INTR_VBUS_VLD           (1 << 0)
 244 #       define  INTR_SESS_VLD           (1 << 1)
 245 #       define  INTR_DP_HI              (1 << 2)
 246 #       define  INTR_ID_GND             (1 << 3)
 247 #       define  INTR_DM_HI              (1 << 4)
 248 #       define  INTR_ID_FLOAT           (1 << 5)
 249 #       define  INTR_BDIS_ACON          (1 << 6)
 250 #       define  INTR_CR_INT             (1 << 7)
 251
 252 /*-------------------------------------------------------------------------*/
 253
 254 static const char *state_string(enum usb_otg_state state)
 255 {
 256         switch (state) {
 257         case OTG_STATE_A_IDLE:          return "a_idle";
 258         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
 259         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
 260         case OTG_STATE_A_HOST:          return "a_host";
 261         case OTG_STATE_A_SUSPEND:       return "a_suspend";
 262         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
 263         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
 264         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
 265         case OTG_STATE_B_IDLE:          return "b_idle";
 266         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
 267         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
 268         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
 269         case OTG_STATE_B_HOST:          return "b_host";
 270         default:                        return "UNDEFINED";
 271         }
 272 }
 273
 274 static inline const char *state_name(struct isp1301 *isp)
 275 {
 276         return state_string(isp->otg.state);
 277 }
 278
 279 /*-------------------------------------------------------------------------*/
 280
 281 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 282  * not everything is guarded by board-specific checks, or even using
 283  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 284  *
 285  * ALSO:  this currently doesn't use ISP1301 low-power modes
 286  * while OTG is running.
 287  */
 288
 289 static void power_down(struct isp1301 *isp)
 290 {
 291         isp->otg.state = OTG_STATE_UNDEFINED;
 292
 293         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 294         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 295
 296         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 297         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 298 }
 299
 300 static void power_up(struct isp1301 *isp)
 301 {
 302         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 303         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 304
 305         /* do this only when cpu is driving transceiver,
 306          * so host won't see a low speed device...
 307          */
 308         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 309 }
 310
 311 #define NO_HOST_SUSPEND
 312
 313 static int host_suspend(struct isp1301 *isp)
 314 {
 315 #ifdef  NO_HOST_SUSPEND
 316         return 0;
 317 #else
 318         struct device   *dev;
 319
 320         if (!isp->otg.host)
 321                 return -ENODEV;
 322
 323         /* Currently ASSUMES only the OTG port matters;
 324          * other ports could be active...
 325          */
 326         dev = isp->otg.host->controller;
 327         return dev->driver->suspend(dev, 3, 0);
 328 #endif
 329 }
 330
 331 static int host_resume(struct isp1301 *isp)
 332 {
 333 #ifdef  NO_HOST_SUSPEND
 334         return 0;
 335 #else
 336         struct device   *dev;
 337
 338         if (!isp->otg.host)
 339                 return -ENODEV;
 340
 341         dev = isp->otg.host->controller;
 342         return dev->driver->resume(dev, 0);
 343 #endif
 344 }
 345
 346 static int gadget_suspend(struct isp1301 *isp)
 347 {
 348         isp->otg.gadget->b_hnp_enable = 0;
 349         isp->otg.gadget->a_hnp_support = 0;
 350         isp->otg.gadget->a_alt_hnp_support = 0;
 351         return usb_gadget_vbus_disconnect(isp->otg.gadget);
 352 }
 353
 354 /*-------------------------------------------------------------------------*/
 355
 356 #define TIMER_MINUTES   10
 357 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 358
 359 /* Almost all our I2C messaging comes from a work queue's task context.
 360  * NOTE: guaranteeing certain response times might mean we shouldn't
 361  * share keventd's work queue; a realtime task might be safest.
 362  */
 363 static void isp1301_defer_work(struct isp1301 *isp, int work)
 364 {
 365         int status;
 366
 367         if (isp && !test_and_set_bit(work, &isp->todo)) {
 368                 (void) get_device(&isp->client->dev);
 369                 status = schedule_work(&isp->work);
 370                 if (!status && !isp->working)
 371                         dev_vdbg(&isp->client->dev,
 372                                 "work item %d may be lost\n", work);
 373         }
 374 }
 375
 376 /* called from irq handlers */
 377 static void a_idle(struct isp1301 *isp, const char *tag)
 378 {
 379         u32 l;
 380
 381         if (isp->otg.state == OTG_STATE_A_IDLE)
 382                 return;
 383
 384         isp->otg.default_a = 1;
 385         if (isp->otg.host) {
 386                 isp->otg.host->is_b_host = 0;
 387                 host_suspend(isp);
 388         }
 389         if (isp->otg.gadget) {
 390                 isp->otg.gadget->is_a_peripheral = 1;
 391                 gadget_suspend(isp);
 392         }
 393         isp->otg.state = OTG_STATE_A_IDLE;
 394         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 395         omap_writel(l, OTG_CTRL);
 396         isp->last_otg_ctrl = l;
 397         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 398 }
 399
 400 /* called from irq handlers */
 401 static void b_idle(struct isp1301 *isp, const char *tag)
 402 {
 403         u32 l;
 404
 405         if (isp->otg.state == OTG_STATE_B_IDLE)
 406                 return;
 407
 408         isp->otg.default_a = 0;
 409         if (isp->otg.host) {
 410                 isp->otg.host->is_b_host = 1;
 411                 host_suspend(isp);
 412         }
 413         if (isp->otg.gadget) {
 414                 isp->otg.gadget->is_a_peripheral = 0;
 415                 gadget_suspend(isp);
 416         }
 417         isp->otg.state = OTG_STATE_B_IDLE;
 418         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 419         omap_writel(l, OTG_CTRL);
 420         isp->last_otg_ctrl = l;
 421         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 422 }
 423
 424 static void
 425 dump_regs(struct isp1301 *isp, const char *label)
 426 {
 427 #ifdef  DEBUG
 428         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 429         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 430         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 431
 432         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 433                 omap_readl(OTG_CTRL), label, state_name(isp),
 434                 ctrl, status, src);
 435         /* mode control and irq enables don't change much */
 436 #endif
 437 }
 438
 439 /*-------------------------------------------------------------------------*/
 440
 441 #ifdef  CONFIG_USB_OTG
 442
 443 /*
 444  * The OMAP OTG controller handles most of the OTG state transitions.
 445  *
 446  * We translate isp1301 outputs (mostly voltage comparator status) into
 447  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 448  * flags into isp1301 inputs ... and infer state transitions.
 449  */
 450
 451 #ifdef  VERBOSE
 452
 453 static void check_state(struct isp1301 *isp, const char *tag)
 454 {
 455         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 456         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 457         unsigned                extra = 0;
 458
 459         switch (fsm) {
 460
 461         /* default-b */
 462         case 0x0:
 463                 state = OTG_STATE_B_IDLE;
 464                 break;
 465         case 0x3:
 466         case 0x7:
 467                 extra = 1;
 468         case 0x1:
 469                 state = OTG_STATE_B_PERIPHERAL;
 470                 break;
 471         case 0x11:
 472                 state = OTG_STATE_B_SRP_INIT;
 473                 break;
 474
 475         /* extra dual-role default-b states */
 476         case 0x12:
 477         case 0x13:
 478         case 0x16:
 479                 extra = 1;
 480         case 0x17:
 481                 state = OTG_STATE_B_WAIT_ACON;
 482                 break;
 483         case 0x34:
 484                 state = OTG_STATE_B_HOST;
 485                 break;
 486
 487         /* default-a */
 488         case 0x36:
 489                 state = OTG_STATE_A_IDLE;
 490                 break;
 491         case 0x3c:
 492                 state = OTG_STATE_A_WAIT_VFALL;
 493                 break;
 494         case 0x7d:
 495                 state = OTG_STATE_A_VBUS_ERR;
 496                 break;
 497         case 0x9e:
 498         case 0x9f:
 499                 extra = 1;
 500         case 0x89:
 501                 state = OTG_STATE_A_PERIPHERAL;
 502                 break;
 503         case 0xb7:
 504                 state = OTG_STATE_A_WAIT_VRISE;
 505                 break;
 506         case 0xb8:
 507                 state = OTG_STATE_A_WAIT_BCON;
 508                 break;
 509         case 0xb9:
 510                 state = OTG_STATE_A_HOST;
 511                 break;
 512         case 0xba:
 513                 state = OTG_STATE_A_SUSPEND;
 514                 break;
 515         default:
 516                 break;
 517         }
 518         if (isp->otg.state == state && !extra)
 519                 return;
 520         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 521                 state_string(state), fsm, state_name(isp),
 522                 omap_readl(OTG_CTRL));
 523 }
 524
 525 #else
 526
 527 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 528
 529 #endif
 530
 531 /* outputs from ISP1301_INTERRUPT_SOURCE */
 532 static void update_otg1(struct isp1301 *isp, u8 int_src)
 533 {
 534         u32     otg_ctrl;
 535
 536         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 537         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 538         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 539
 540         if (int_src & INTR_SESS_VLD)
 541                 otg_ctrl |= OTG_ASESSVLD;
 542         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
 543                 a_idle(isp, "vfall");
 544                 otg_ctrl &= ~OTG_CTRL_BITS;
 545         }
 546         if (int_src & INTR_VBUS_VLD)
 547                 otg_ctrl |= OTG_VBUSVLD;
 548         if (int_src & INTR_ID_GND) {            /* default-A */
 549                 if (isp->otg.state == OTG_STATE_B_IDLE
 550                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 551                         a_idle(isp, "init");
 552                         return;
 553                 }
 554         } else {                                /* default-B */
 555                 otg_ctrl |= OTG_ID;
 556                 if (isp->otg.state == OTG_STATE_A_IDLE
 557                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
 558                         b_idle(isp, "init");
 559                         return;
 560                 }
 561         }
 562         omap_writel(otg_ctrl, OTG_CTRL);
 563 }
 564
 565 /* outputs from ISP1301_OTG_STATUS */
 566 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 567 {
 568         u32     otg_ctrl;
 569
 570         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 571         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 572         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 573         if (otg_status & OTG_B_SESS_VLD)
 574                 otg_ctrl |= OTG_BSESSVLD;
 575         else if (otg_status & OTG_B_SESS_END)
 576                 otg_ctrl |= OTG_BSESSEND;
 577         omap_writel(otg_ctrl, OTG_CTRL);
 578 }
 579
 580 /* inputs going to ISP1301 */
 581 static void otg_update_isp(struct isp1301 *isp)
 582 {
 583         u32     otg_ctrl, otg_change;
 584         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 585
 586         otg_ctrl = omap_readl(OTG_CTRL);
 587         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 588         isp->last_otg_ctrl = otg_ctrl;
 589         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 590
 591         switch (isp->otg.state) {
 592         case OTG_STATE_B_IDLE:
 593         case OTG_STATE_B_PERIPHERAL:
 594         case OTG_STATE_B_SRP_INIT:
 595                 if (!(otg_ctrl & OTG_PULLUP)) {
 596                         // if (otg_ctrl & OTG_B_HNPEN) {
 597                         if (isp->otg.gadget->b_hnp_enable) {
 598                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
 599                                 pr_debug("  --> b_wait_acon\n");
 600                         }
 601                         goto pulldown;
 602                 }
 603 pullup:
 604                 set |= OTG1_DP_PULLUP;
 605                 clr |= OTG1_DP_PULLDOWN;
 606                 break;
 607         case OTG_STATE_A_SUSPEND:
 608         case OTG_STATE_A_PERIPHERAL:
 609                 if (otg_ctrl & OTG_PULLUP)
 610                         goto pullup;
 611                 /* FALLTHROUGH */
 612         // case OTG_STATE_B_WAIT_ACON:
 613         default:
 614 pulldown:
 615                 set |= OTG1_DP_PULLDOWN;
 616                 clr |= OTG1_DP_PULLUP;
 617                 break;
 618         }
 619
 620 #       define toggle(OTG,ISP) do { \
 621                 if (otg_ctrl & OTG) set |= ISP; \
 622                 else clr |= ISP; \
 623                 } while (0)
 624
 625         if (!(isp->otg.host))
 626                 otg_ctrl &= ~OTG_DRV_VBUS;
 627
 628         switch (isp->otg.state) {
 629         case OTG_STATE_A_SUSPEND:
 630                 if (otg_ctrl & OTG_DRV_VBUS) {
 631                         set |= OTG1_VBUS_DRV;
 632                         break;
 633                 }
 634                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 635                 notresponding(isp);
 636
 637                 /* FALLTHROUGH */
 638         case OTG_STATE_A_VBUS_ERR:
 639                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 640                 pr_debug("  --> a_wait_vfall\n");
 641                 /* FALLTHROUGH */
 642         case OTG_STATE_A_WAIT_VFALL:
 643                 /* FIXME usbcore thinks port power is still on ... */
 644                 clr |= OTG1_VBUS_DRV;
 645                 break;
 646         case OTG_STATE_A_IDLE:
 647                 if (otg_ctrl & OTG_DRV_VBUS) {
 648                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
 649                         pr_debug("  --> a_wait_vrise\n");
 650                 }
 651                 /* FALLTHROUGH */
 652         default:
 653                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 654         }
 655
 656         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 657         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 658
 659 #       undef toggle
 660
 661         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 662         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 663
 664         /* HNP switch to host or peripheral; and SRP */
 665         if (otg_change & OTG_PULLUP) {
 666                 u32 l;
 667
 668                 switch (isp->otg.state) {
 669                 case OTG_STATE_B_IDLE:
 670                         if (clr & OTG1_DP_PULLUP)
 671                                 break;
 672                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 673                         pr_debug("  --> b_peripheral\n");
 674                         break;
 675                 case OTG_STATE_A_SUSPEND:
 676                         if (clr & OTG1_DP_PULLUP)
 677                                 break;
 678                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
 679                         pr_debug("  --> a_peripheral\n");
 680                         break;
 681                 default:
 682                         break;
 683                 }
 684                 l = omap_readl(OTG_CTRL);
 685                 l |= OTG_PULLUP;
 686                 omap_writel(l, OTG_CTRL);
 687         }
 688
 689         check_state(isp, __func__);
 690         dump_regs(isp, "otg->isp1301");
 691 }
 692
 693 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 694 {
 695         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 696         u32             otg_ctrl;
 697         int             ret = IRQ_NONE;
 698         struct isp1301  *isp = _isp;
 699
 700         /* update ISP1301 transciever from OTG controller */
 701         if (otg_irq & OPRT_CHG) {
 702                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 703                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 704                 ret = IRQ_HANDLED;
 705
 706         /* SRP to become b_peripheral failed */
 707         } else if (otg_irq & B_SRP_TMROUT) {
 708                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 709                 notresponding(isp);
 710
 711                 /* gadget drivers that care should monitor all kinds of
 712                  * remote wakeup (SRP, normal) using their own timer
 713                  * to give "check cable and A-device" messages.
 714                  */
 715                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 716                         b_idle(isp, "srp_timeout");
 717
 718                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 719                 ret = IRQ_HANDLED;
 720
 721         /* HNP to become b_host failed */
 722         } else if (otg_irq & B_HNP_FAIL) {
 723                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 724                                 state_name(isp), omap_readl(OTG_CTRL));
 725                 notresponding(isp);
 726
 727                 otg_ctrl = omap_readl(OTG_CTRL);
 728                 otg_ctrl |= OTG_BUSDROP;
 729                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 730                 omap_writel(otg_ctrl, OTG_CTRL);
 731
 732                 /* subset of b_peripheral()... */
 733                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
 734                 pr_debug("  --> b_peripheral\n");
 735
 736                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 737                 ret = IRQ_HANDLED;
 738
 739         /* detect SRP from B-device ... */
 740         } else if (otg_irq & A_SRP_DETECT) {
 741                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 742                                 state_name(isp), omap_readl(OTG_CTRL));
 743
 744                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 745                 switch (isp->otg.state) {
 746                 case OTG_STATE_A_IDLE:
 747                         if (!isp->otg.host)
 748                                 break;
 749                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 750                         otg_ctrl = omap_readl(OTG_CTRL);
 751                         otg_ctrl |= OTG_A_BUSREQ;
 752                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 753                                         & ~OTG_XCEIV_INPUTS
 754                                         & OTG_CTRL_MASK;
 755                         omap_writel(otg_ctrl, OTG_CTRL);
 756                         break;
 757                 default:
 758                         break;
 759                 }
 760
 761                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 762                 ret = IRQ_HANDLED;
 763
 764         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 765          * we don't track them separately
 766          */
 767         } else if (otg_irq & A_REQ_TMROUT) {
 768                 otg_ctrl = omap_readl(OTG_CTRL);
 769                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 770                                 state_name(isp), otg_ctrl);
 771                 notresponding(isp);
 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_WAIT_VFALL;
 777
 778                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 779                 ret = IRQ_HANDLED;
 780
 781         /* A-supplied voltage fell too low; overcurrent */
 782         } else if (otg_irq & A_VBUS_ERR) {
 783                 otg_ctrl = omap_readl(OTG_CTRL);
 784                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 785                         state_name(isp), otg_irq, otg_ctrl);
 786
 787                 otg_ctrl |= OTG_BUSDROP;
 788                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 789                 omap_writel(otg_ctrl, OTG_CTRL);
 790                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
 791
 792                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 793                 ret = IRQ_HANDLED;
 794
 795         /* switch driver; the transciever code activates it,
 796          * ungating the udc clock or resuming OHCI.
 797          */
 798         } else if (otg_irq & DRIVER_SWITCH) {
 799                 int     kick = 0;
 800
 801                 otg_ctrl = omap_readl(OTG_CTRL);
 802                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 803                                 state_name(isp),
 804                                 (otg_ctrl & OTG_DRIVER_SEL)
 805                                         ? "gadget" : "host",
 806                                 otg_ctrl);
 807                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 808
 809                 /* role is peripheral */
 810                 if (otg_ctrl & OTG_DRIVER_SEL) {
 811                         switch (isp->otg.state) {
 812                         case OTG_STATE_A_IDLE:
 813                                 b_idle(isp, __func__);
 814                                 break;
 815                         default:
 816                                 break;
 817                         }
 818                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 819
 820                 /* role is host */
 821                 } else {
 822                         if (!(otg_ctrl & OTG_ID)) {
 823                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 824                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 825                         }
 826
 827                         if (isp->otg.host) {
 828                                 switch (isp->otg.state) {
 829                                 case OTG_STATE_B_WAIT_ACON:
 830                                         isp->otg.state = OTG_STATE_B_HOST;
 831                                         pr_debug("  --> b_host\n");
 832                                         kick = 1;
 833                                         break;
 834                                 case OTG_STATE_A_WAIT_BCON:
 835                                         isp->otg.state = OTG_STATE_A_HOST;
 836                                         pr_debug("  --> a_host\n");
 837                                         break;
 838                                 case OTG_STATE_A_PERIPHERAL:
 839                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
 840                                         pr_debug("  --> a_wait_bcon\n");
 841                                         break;
 842                                 default:
 843                                         break;
 844                                 }
 845                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 846                         }
 847                 }
 848
 849                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 850                 ret = IRQ_HANDLED;
 851
 852                 if (kick)
 853                         usb_bus_start_enum(isp->otg.host,
 854                                                 isp->otg.host->otg_port);
 855         }
 856
 857         check_state(isp, __func__);
 858         return ret;
 859 }
 860
 861 static struct platform_device *otg_dev;
 862
 863 static int otg_init(struct isp1301 *isp)
 864 {
 865         u32 l;
 866
 867         if (!otg_dev)
 868                 return -ENODEV;
 869
 870         dump_regs(isp, __func__);
 871         /* some of these values are board-specific... */
 872         l = omap_readl(OTG_SYSCON_2);
 873         l |= OTG_EN
 874                 /* for B-device: */
 875                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 876                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 877                 // | (3 << 24)          /* 2msec VBUS pulse */
 878                 /* for A-device: */
 879                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 880                 | SRP_DPW               /* detect 167+ns SRP pulses */
 881                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 882                 ;
 883         omap_writel(l, OTG_SYSCON_2);
 884
 885         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 886         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 887
 888         check_state(isp, __func__);
 889         pr_debug("otg: %s, %s %06x\n",
 890                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 891
 892         omap_writew(DRIVER_SWITCH | OPRT_CHG
 893                         | B_SRP_TMROUT | B_HNP_FAIL
 894                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 895
 896         l = omap_readl(OTG_SYSCON_2);
 897         l |= OTG_EN;
 898         omap_writel(l, OTG_SYSCON_2);
 899
 900         return 0;
 901 }
 902
 903 static int otg_probe(struct platform_device *dev)
 904 {
 905         // struct omap_usb_config *config = dev->platform_data;
 906
 907         otg_dev = dev;
 908         return 0;
 909 }
 910
 911 static int otg_remove(struct platform_device *dev)
 912 {
 913         otg_dev = NULL;
 914         return 0;
 915 }
 916
 917 static struct platform_driver omap_otg_driver = {
 918         .probe          = otg_probe,
 919         .remove         = otg_remove,
 920         .driver         = {
 921                 .owner  = THIS_MODULE,
 922                 .name   = "omap_otg",
 923         },
 924 };
 925
 926 static int otg_bind(struct isp1301 *isp)
 927 {
 928         int     status;
 929
 930         if (otg_dev)
 931                 return -EBUSY;
 932
 933         status = platform_driver_register(&omap_otg_driver);
 934         if (status < 0)
 935                 return status;
 936
 937         if (otg_dev)
 938                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 939                                 IRQF_DISABLED, DRIVER_NAME, isp);
 940         else
 941                 status = -ENODEV;
 942
 943         if (status < 0)
 944                 platform_driver_unregister(&omap_otg_driver);
 945         return status;
 946 }
 947
 948 static void otg_unbind(struct isp1301 *isp)
 949 {
 950         if (!otg_dev)
 951                 return;
 952         free_irq(otg_dev->resource[1].start, isp);
 953 }
 954
 955 #else
 956
 957 /* OTG controller isn't clocked */
 958
 959 #endif  /* CONFIG_USB_OTG */
 960
 961 /*-------------------------------------------------------------------------*/
 962
 963 static void b_peripheral(struct isp1301 *isp)
 964 {
 965         u32 l;
 966
 967         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 968         omap_writel(l, OTG_CTRL);
 969
 970         usb_gadget_vbus_connect(isp->otg.gadget);
 971
 972 #ifdef  CONFIG_USB_OTG
 973         enable_vbus_draw(isp, 8);
 974         otg_update_isp(isp);
 975 #else
 976         enable_vbus_draw(isp, 100);
 977         /* UDC driver just set OTG_BSESSVLD */
 978         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 979         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 980         isp->otg.state = OTG_STATE_B_PERIPHERAL;
 981         pr_debug("  --> b_peripheral\n");
 982         dump_regs(isp, "2periph");
 983 #endif
 984 }
 985
 986 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 987 {
 988         u8                      isp_stat, isp_bstat;
 989         enum usb_otg_state      state = isp->otg.state;
 990
 991         if (stat & INTR_BDIS_ACON)
 992                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 993
 994         /* start certain state transitions right away */
 995         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 996         if (isp_stat & INTR_ID_GND) {
 997                 if (isp->otg.default_a) {
 998                         switch (state) {
 999                         case OTG_STATE_B_IDLE:
1000                                 a_idle(isp, "idle");
1001                                 /* FALLTHROUGH */
1002                         case OTG_STATE_A_IDLE:
1003                                 enable_vbus_source(isp);
1004                                 /* FALLTHROUGH */
1005                         case OTG_STATE_A_WAIT_VRISE:
1006                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
1007                                  * the HC will transition to A_HOST (or
1008                                  * A_SUSPEND!) without our noticing except
1009                                  * when HNP is used.
1010                                  */
1011                                 if (isp_stat & INTR_VBUS_VLD)
1012                                         isp->otg.state = OTG_STATE_A_HOST;
1013                                 break;
1014                         case OTG_STATE_A_WAIT_VFALL:
1015                                 if (!(isp_stat & INTR_SESS_VLD))
1016                                         a_idle(isp, "vfell");
1017                                 break;
1018                         default:
1019                                 if (!(isp_stat & INTR_VBUS_VLD))
1020                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1021                                 break;
1022                         }
1023                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1024                 } else {
1025                         switch (state) {
1026                         case OTG_STATE_B_PERIPHERAL:
1027                         case OTG_STATE_B_HOST:
1028                         case OTG_STATE_B_WAIT_ACON:
1029                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1030                                 break;
1031                         default:
1032                                 break;
1033                         }
1034                         if (state != OTG_STATE_A_IDLE)
1035                                 a_idle(isp, "id");
1036                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1037                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1038                         isp_bstat = 0;
1039                 }
1040         } else {
1041                 u32 l;
1042
1043                 /* if user unplugged mini-A end of cable,
1044                  * don't bypass A_WAIT_VFALL.
1045                  */
1046                 if (isp->otg.default_a) {
1047                         switch (state) {
1048                         default:
1049                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1050                                 break;
1051                         case OTG_STATE_A_WAIT_VFALL:
1052                                 state = OTG_STATE_A_IDLE;
1053                                 /* khubd may take a while to notice and
1054                                  * handle this disconnect, so don't go
1055                                  * to B_IDLE quite yet.
1056                                  */
1057                                 break;
1058                         case OTG_STATE_A_IDLE:
1059                                 host_suspend(isp);
1060                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1061                                                 MC1_BDIS_ACON_EN);
1062                                 isp->otg.state = OTG_STATE_B_IDLE;
1063                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1064                                 l &= ~OTG_CTRL_BITS;
1065                                 omap_writel(l, OTG_CTRL);
1066                                 break;
1067                         case OTG_STATE_B_IDLE:
1068                                 break;
1069                         }
1070                 }
1071                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1072
1073                 switch (isp->otg.state) {
1074                 case OTG_STATE_B_PERIPHERAL:
1075                 case OTG_STATE_B_WAIT_ACON:
1076                 case OTG_STATE_B_HOST:
1077                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1078                                 break;
1079                         enable_vbus_draw(isp, 0);
1080 #ifndef CONFIG_USB_OTG
1081                         /* UDC driver will clear OTG_BSESSVLD */
1082                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1083                                                 OTG1_DP_PULLDOWN);
1084                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1085                                                 OTG1_DP_PULLUP);
1086                         dump_regs(isp, __func__);
1087 #endif
1088                         /* FALLTHROUGH */
1089                 case OTG_STATE_B_SRP_INIT:
1090                         b_idle(isp, __func__);
1091                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1092                         omap_writel(l, OTG_CTRL);
1093                         /* FALLTHROUGH */
1094                 case OTG_STATE_B_IDLE:
1095                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1096 #ifdef  CONFIG_USB_OTG
1097                                 update_otg1(isp, isp_stat);
1098                                 update_otg2(isp, isp_bstat);
1099 #endif
1100                                 b_peripheral(isp);
1101                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1102                                 isp_bstat |= OTG_B_SESS_END;
1103                         break;
1104                 case OTG_STATE_A_WAIT_VFALL:
1105                         break;
1106                 default:
1107                         pr_debug("otg: unsupported b-device %s\n",
1108                                 state_name(isp));
1109                         break;
1110                 }
1111         }
1112
1113         if (state != isp->otg.state)
1114                 pr_debug("  isp, %s -> %s\n",
1115                                 state_string(state), state_name(isp));
1116
1117 #ifdef  CONFIG_USB_OTG
1118         /* update the OTG controller state to match the isp1301; may
1119          * trigger OPRT_CHG irqs for changes going to the isp1301.
1120          */
1121         update_otg1(isp, isp_stat);
1122         update_otg2(isp, isp_bstat);
1123         check_state(isp, __func__);
1124 #endif
1125
1126         dump_regs(isp, "isp1301->otg");
1127 }
1128
1129 /*-------------------------------------------------------------------------*/
1130
1131 static u8 isp1301_clear_latch(struct isp1301 *isp)
1132 {
1133         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1134         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1135         return latch;
1136 }
1137
1138 static void
1139 isp1301_work(struct work_struct *work)
1140 {
1141         struct isp1301  *isp = container_of(work, struct isp1301, work);
1142         int             stop;
1143
1144         /* implicit lock:  we're the only task using this device */
1145         isp->working = 1;
1146         do {
1147                 stop = test_bit(WORK_STOP, &isp->todo);
1148
1149 #ifdef  CONFIG_USB_OTG
1150                 /* transfer state from otg engine to isp1301 */
1151                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1152                         otg_update_isp(isp);
1153                         put_device(&isp->client->dev);
1154                 }
1155 #endif
1156                 /* transfer state from isp1301 to otg engine */
1157                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1158                         u8              stat = isp1301_clear_latch(isp);
1159
1160                         isp_update_otg(isp, stat);
1161                         put_device(&isp->client->dev);
1162                 }
1163
1164                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1165                         u32     otg_ctrl;
1166
1167                         /*
1168                          * skip A_WAIT_VRISE; hc transitions invisibly
1169                          * skip A_WAIT_BCON; same.
1170                          */
1171                         switch (isp->otg.state) {
1172                         case OTG_STATE_A_WAIT_BCON:
1173                         case OTG_STATE_A_WAIT_VRISE:
1174                                 isp->otg.state = OTG_STATE_A_HOST;
1175                                 pr_debug("  --> a_host\n");
1176                                 otg_ctrl = omap_readl(OTG_CTRL);
1177                                 otg_ctrl |= OTG_A_BUSREQ;
1178                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1179                                                 & OTG_CTRL_MASK;
1180                                 omap_writel(otg_ctrl, OTG_CTRL);
1181                                 break;
1182                         case OTG_STATE_B_WAIT_ACON:
1183                                 isp->otg.state = OTG_STATE_B_HOST;
1184                                 pr_debug("  --> b_host (acon)\n");
1185                                 break;
1186                         case OTG_STATE_B_HOST:
1187                         case OTG_STATE_B_IDLE:
1188                         case OTG_STATE_A_IDLE:
1189                                 break;
1190                         default:
1191                                 pr_debug("  host resume in %s\n",
1192                                                 state_name(isp));
1193                         }
1194                         host_resume(isp);
1195                         // mdelay(10);
1196                         put_device(&isp->client->dev);
1197                 }
1198
1199                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1200 #ifdef  VERBOSE
1201                         dump_regs(isp, "timer");
1202                         if (!stop)
1203                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1204 #endif
1205                         put_device(&isp->client->dev);
1206                 }
1207
1208                 if (isp->todo)
1209                         dev_vdbg(&isp->client->dev,
1210                                 "work done, todo = 0x%lx\n",
1211                                 isp->todo);
1212                 if (stop) {
1213                         dev_dbg(&isp->client->dev, "stop\n");
1214                         break;
1215                 }
1216         } while (isp->todo);
1217         isp->working = 0;
1218 }
1219
1220 static irqreturn_t isp1301_irq(int irq, void *isp)
1221 {
1222         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1223         return IRQ_HANDLED;
1224 }
1225
1226 static void isp1301_timer(unsigned long _isp)
1227 {
1228         isp1301_defer_work((void *)_isp, WORK_TIMER);
1229 }
1230
1231 /*-------------------------------------------------------------------------*/
1232
1233 static void isp1301_release(struct device *dev)
1234 {
1235         struct isp1301  *isp;
1236
1237         isp = dev_get_drvdata(dev);
1238
1239         /* FIXME -- not with a "new style" driver, it doesn't!! */
1240
1241         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1242         if (isp->i2c_release)
1243                 isp->i2c_release(dev);
1244         kfree (isp);
1245 }
1246
1247 static struct isp1301 *the_transceiver;
1248
1249 static int __exit isp1301_remove(struct i2c_client *i2c)
1250 {
1251         struct isp1301  *isp;
1252
1253         isp = i2c_get_clientdata(i2c);
1254
1255         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1256         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1257         free_irq(i2c->irq, isp);
1258 #ifdef  CONFIG_USB_OTG
1259         otg_unbind(isp);
1260 #endif
1261         if (machine_is_omap_h2())
1262                 gpio_free(2);
1263
1264         isp->timer.data = 0;
1265         set_bit(WORK_STOP, &isp->todo);
1266         del_timer_sync(&isp->timer);
1267         flush_scheduled_work();
1268
1269         put_device(&i2c->dev);
1270         the_transceiver = NULL;
1271
1272         return 0;
1273 }
1274
1275 /*-------------------------------------------------------------------------*/
1276
1277 /* NOTE:  three modes are possible here, only one of which
1278  * will be standards-conformant on any given system:
1279  *
1280  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1281  *  - HOST mode, for when there's one or more A (host) connectors
1282  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1283  *
1284  * As a rule, you won't have an isp1301 chip unless it's there to
1285  * support the OTG mode.  Other modes help testing USB controllers
1286  * in isolation from (full) OTG support, or maybe so later board
1287  * revisions can help to support those feature.
1288  */
1289
1290 #ifdef  CONFIG_USB_OTG
1291
1292 static int isp1301_otg_enable(struct isp1301 *isp)
1293 {
1294         power_up(isp);
1295         otg_init(isp);
1296
1297         /* NOTE:  since we don't change this, this provides
1298          * a few more interrupts than are strictly needed.
1299          */
1300         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1301                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1302         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1303                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1304
1305         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1306
1307         return 0;
1308 }
1309
1310 #endif
1311
1312 /* add or disable the host device+driver */
1313 static int
1314 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1315 {
1316         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1317
1318         if (!otg || isp != the_transceiver)
1319                 return -ENODEV;
1320
1321         if (!host) {
1322                 omap_writew(0, OTG_IRQ_EN);
1323                 power_down(isp);
1324                 isp->otg.host = NULL;
1325                 return 0;
1326         }
1327
1328 #ifdef  CONFIG_USB_OTG
1329         isp->otg.host = host;
1330         dev_dbg(&isp->client->dev, "registered host\n");
1331         host_suspend(isp);
1332         if (isp->otg.gadget)
1333                 return isp1301_otg_enable(isp);
1334         return 0;
1335
1336 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1337         // FIXME update its refcount
1338         isp->otg.host = host;
1339
1340         power_up(isp);
1341
1342         if (machine_is_omap_h2())
1343                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1344
1345         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1346         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1347                 INTR_ID_GND);
1348         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1349                 INTR_ID_GND);
1350
1351         /* If this has a Mini-AB connector, this mode is highly
1352          * nonstandard ... but can be handy for testing, especially with
1353          * the Mini-A end of an OTG cable.  (Or something nonstandard
1354          * like MiniB-to-StandardB, maybe built with a gender mender.)
1355          */
1356         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1357
1358         dump_regs(isp, __func__);
1359
1360         return 0;
1361
1362 #else
1363         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1364         return -EINVAL;
1365 #endif
1366
1367 }
1368
1369 static int
1370 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1371 {
1372         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1373 #ifndef CONFIG_USB_OTG
1374         u32 l;
1375 #endif
1376
1377         if (!otg || isp != the_transceiver)
1378                 return -ENODEV;
1379
1380         if (!gadget) {
1381                 omap_writew(0, OTG_IRQ_EN);
1382                 if (!isp->otg.default_a)
1383                         enable_vbus_draw(isp, 0);
1384                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1385                 isp->otg.gadget = NULL;
1386                 power_down(isp);
1387                 return 0;
1388         }
1389
1390 #ifdef  CONFIG_USB_OTG
1391         isp->otg.gadget = gadget;
1392         dev_dbg(&isp->client->dev, "registered gadget\n");
1393         /* gadget driver may be suspended until vbus_connect () */
1394         if (isp->otg.host)
1395                 return isp1301_otg_enable(isp);
1396         return 0;
1397
1398 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1399         isp->otg.gadget = gadget;
1400         // FIXME update its refcount
1401
1402         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1403         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1404         l |= OTG_ID;
1405         omap_writel(l, OTG_CTRL);
1406
1407         power_up(isp);
1408         isp->otg.state = OTG_STATE_B_IDLE;
1409
1410         if (machine_is_omap_h2() || machine_is_omap_h3())
1411                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1412
1413         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1414                 INTR_SESS_VLD);
1415         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1416                 INTR_VBUS_VLD);
1417         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1418         dump_regs(isp, __func__);
1419
1420         /* If this has a Mini-AB connector, this mode is highly
1421          * nonstandard ... but can be handy for testing, so long
1422          * as you don't plug a Mini-A cable into the jack.
1423          */
1424         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1425                 b_peripheral(isp);
1426
1427         return 0;
1428
1429 #else
1430         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1431         return -EINVAL;
1432 #endif
1433 }
1434
1435
1436 /*-------------------------------------------------------------------------*/
1437
1438 static int
1439 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1440 {
1441         if (!the_transceiver)
1442                 return -ENODEV;
1443         if (dev->state == OTG_STATE_B_PERIPHERAL)
1444                 enable_vbus_draw(the_transceiver, mA);
1445         return 0;
1446 }
1447
1448 static int
1449 isp1301_start_srp(struct otg_transceiver *dev)
1450 {
1451         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1452         u32             otg_ctrl;
1453
1454         if (!dev || isp != the_transceiver
1455                         || isp->otg.state != OTG_STATE_B_IDLE)
1456                 return -ENODEV;
1457
1458         otg_ctrl = omap_readl(OTG_CTRL);
1459         if (!(otg_ctrl & OTG_BSESSEND))
1460                 return -EINVAL;
1461
1462         otg_ctrl |= OTG_B_BUSREQ;
1463         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1464         omap_writel(otg_ctrl, OTG_CTRL);
1465         isp->otg.state = OTG_STATE_B_SRP_INIT;
1466
1467         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1468                         omap_readl(OTG_CTRL));
1469 #ifdef  CONFIG_USB_OTG
1470         check_state(isp, __func__);
1471 #endif
1472         return 0;
1473 }
1474
1475 static int
1476 isp1301_start_hnp(struct otg_transceiver *dev)
1477 {
1478 #ifdef  CONFIG_USB_OTG
1479         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1480         u32 l;
1481
1482         if (!dev || isp != the_transceiver)
1483                 return -ENODEV;
1484         if (isp->otg.default_a && (isp->otg.host == NULL
1485                         || !isp->otg.host->b_hnp_enable))
1486                 return -ENOTCONN;
1487         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1488                         || !isp->otg.gadget->b_hnp_enable))
1489                 return -ENOTCONN;
1490
1491         /* We want hardware to manage most HNP protocol timings.
1492          * So do this part as early as possible...
1493          */
1494         switch (isp->otg.state) {
1495         case OTG_STATE_B_HOST:
1496                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1497                 /* caller will suspend next */
1498                 break;
1499         case OTG_STATE_A_HOST:
1500 #if 0
1501                 /* autoconnect mode avoids irq latency bugs */
1502                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1503                                 MC1_BDIS_ACON_EN);
1504 #endif
1505                 /* caller must suspend then clear A_BUSREQ */
1506                 usb_gadget_vbus_connect(isp->otg.gadget);
1507                 l = omap_readl(OTG_CTRL);
1508                 l |= OTG_A_SETB_HNPEN;
1509                 omap_writel(l, OTG_CTRL);
1510
1511                 break;
1512         case OTG_STATE_A_PERIPHERAL:
1513                 /* initiated by B-Host suspend */
1514                 break;
1515         default:
1516                 return -EILSEQ;
1517         }
1518         pr_debug("otg: HNP %s, %06x ...\n",
1519                 state_name(isp), omap_readl(OTG_CTRL));
1520         check_state(isp, __func__);
1521         return 0;
1522 #else
1523         /* srp-only */
1524         return -EINVAL;
1525 #endif
1526 }
1527
1528 /*-------------------------------------------------------------------------*/
1529
1530 static int __init
1531 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1532 {
1533         int                     status;
1534         struct isp1301          *isp;
1535
1536         if (the_transceiver)
1537                 return 0;
1538
1539         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1540         if (!isp)
1541                 return 0;
1542
1543         INIT_WORK(&isp->work, isp1301_work);
1544         init_timer(&isp->timer);
1545         isp->timer.function = isp1301_timer;
1546         isp->timer.data = (unsigned long) isp;
1547
1548         i2c_set_clientdata(i2c, isp);
1549         isp->client = i2c;
1550
1551         /* verify the chip (shouldn't be necesary) */
1552         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1553         if (status != I2C_VENDOR_ID_PHILIPS) {
1554                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1555                 goto fail;
1556         }
1557         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1558         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1559                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1560                 goto fail;
1561         }
1562         isp->i2c_release = i2c->dev.release;
1563         i2c->dev.release = isp1301_release;
1564
1565         /* initial development used chiprev 2.00 */
1566         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1567         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1568                 status >> 8, status & 0xff);
1569
1570         /* make like power-on reset */
1571         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1572
1573         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1574         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1575
1576         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1577                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1578         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1579                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1580
1581         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1582         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1583         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1584
1585 #ifdef  CONFIG_USB_OTG
1586         status = otg_bind(isp);
1587         if (status < 0) {
1588                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1589                 goto fail;
1590         }
1591 #endif
1592
1593         if (machine_is_omap_h2()) {
1594                 /* full speed signaling by default */
1595                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1596                         MC1_SPEED);
1597                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1598                         MC2_SPD_SUSP_CTRL);
1599
1600                 /* IRQ wired at M14 */
1601                 omap_cfg_reg(M14_1510_GPIO2);
1602                 if (gpio_request(2, "isp1301") == 0)
1603                         gpio_direction_input(2);
1604                 isp->irq_type = IRQF_TRIGGER_FALLING;
1605         }
1606
1607         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1608         status = request_irq(i2c->irq, isp1301_irq,
1609                         isp->irq_type, DRIVER_NAME, isp);
1610         if (status < 0) {
1611                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1612                                 i2c->irq, status);
1613                 goto fail;
1614         }
1615
1616         isp->otg.dev = &i2c->dev;
1617         isp->otg.label = DRIVER_NAME;
1618
1619         isp->otg.set_host = isp1301_set_host,
1620         isp->otg.set_peripheral = isp1301_set_peripheral,
1621         isp->otg.set_power = isp1301_set_power,
1622         isp->otg.start_srp = isp1301_start_srp,
1623         isp->otg.start_hnp = isp1301_start_hnp,
1624
1625         enable_vbus_draw(isp, 0);
1626         power_down(isp);
1627         the_transceiver = isp;
1628
1629 #ifdef  CONFIG_USB_OTG
1630         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1631         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1632 #endif
1633
1634         dump_regs(isp, __func__);
1635
1636 #ifdef  VERBOSE
1637         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1638         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1639 #endif
1640
1641         status = otg_set_transceiver(&isp->otg);
1642         if (status < 0)
1643                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1644                         status);
1645
1646         return 0;
1647
1648 fail:
1649         kfree(isp);
1650         return -ENODEV;
1651 }
1652
1653 static const struct i2c_device_id isp1301_id[] = {
1654         { "isp1301_omap", 0 },
1655         { }
1656 };
1657 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1658
1659 static struct i2c_driver isp1301_driver = {
1660         .driver = {
1661                 .name   = "isp1301_omap",
1662         },
1663         .probe          = isp1301_probe,
1664         .remove         = __exit_p(isp1301_remove),
1665         .id_table       = isp1301_id,
1666 };
1667
1668 /*-------------------------------------------------------------------------*/
1669
1670 static int __init isp_init(void)
1671 {
1672         return i2c_add_driver(&isp1301_driver);
1673 }
1674 module_init(isp_init);
1675
1676 static void __exit isp_exit(void)
1677 {
1678         if (the_transceiver)
1679                 otg_set_transceiver(NULL);
1680         i2c_del_driver(&isp1301_driver);
1681 }
1682 module_exit(isp_exit);
1683