drivers/usb/otg/isp1301_omap.c

   1 /*
   2  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004 Texas Instruments
   5  * Copyright (C) 2004 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/gpio.h>
  29 #include <linux/usb/ch9.h>
  30 #include <linux/usb/gadget.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/otg.h>
  33 #include <linux/i2c.h>
  34 #include <linux/workqueue.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/mach-types.h>
  38
  39 #include <plat/mux.h>
  40
  41 #include <mach/usb.h>
  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 usb_phy          phy;
  56         struct i2c_client       *client;
  57         void                    (*i2c_release)(struct device *dev);
  58
  59         int                     irq_type;
  60
  61         u32                     last_otg_ctrl;
  62         unsigned                working:1;
  63
  64         struct timer_list       timer;
  65
  66         /* use keventd context to change the state for us */
  67         struct work_struct      work;
  68
  69         unsigned long           todo;
  70 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  71 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  72 #               define WORK_HOST_RESUME 4       /* resume host */
  73 #               define WORK_TIMER       6       /* timer fired */
  74 #               define WORK_STOP        7       /* don't resubmit */
  75 };
  76
  77
  78 /* bits in OTG_CTRL */
  79
  80 #define OTG_XCEIV_OUTPUTS \
  81         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  82 #define OTG_XCEIV_INPUTS \
  83         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  84 #define OTG_CTRL_BITS \
  85         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  86         /* and OTG_PULLUP is sometimes written */
  87
  88 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  89         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  90         OTG_CTRL_BITS)
  91
  92
  93 /*-------------------------------------------------------------------------*/
  94
  95 /* board-specific PM hooks */
  96
  97 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  98
  99 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 100
 101 #include <linux/i2c/tps65010.h>
 102
 103 #else
 104
 105 static inline int tps65010_set_vbus_draw(unsigned mA)
 106 {
 107         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 108         return 0;
 109 }
 110
 111 #endif
 112
 113 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 114 {
 115         int status = tps65010_set_vbus_draw(mA);
 116         if (status < 0)
 117                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 118 }
 119
 120 #else
 121
 122 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 123 {
 124         /* H4 controls this by DIP switch S2.4; no soft control.
 125          * ON means the charger is always enabled.  Leave it OFF
 126          * unless the OTG port is used only in B-peripheral mode.
 127          */
 128 }
 129
 130 #endif
 131
 132 static void enable_vbus_source(struct isp1301 *isp)
 133 {
 134         /* this board won't supply more than 8mA vbus power.
 135          * some boards can switch a 100ma "unit load" (or more).
 136          */
 137 }
 138
 139
 140 /* products will deliver OTG messages with LEDs, GUI, etc */
 141 static inline void notresponding(struct isp1301 *isp)
 142 {
 143         printk(KERN_NOTICE "OTG device not responding.\n");
 144 }
 145
 146
 147 /*-------------------------------------------------------------------------*/
 148
 149 static struct i2c_driver isp1301_driver;
 150
 151 /* smbus apis are used for portability */
 152
 153 static inline u8
 154 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 155 {
 156         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 157 }
 158
 159 static inline int
 160 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 161 {
 162         return i2c_smbus_read_word_data(isp->client, reg);
 163 }
 164
 165 static inline int
 166 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 167 {
 168         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 169 }
 170
 171 static inline int
 172 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 173 {
 174         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 175 }
 176
 177 /*-------------------------------------------------------------------------*/
 178
 179 /* identification */
 180 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 181 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 182 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 183
 184 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 185 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 186
 187 /* operational registers */
 188 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 189 #       define  MC1_SPEED               (1 << 0)
 190 #       define  MC1_SUSPEND             (1 << 1)
 191 #       define  MC1_DAT_SE0             (1 << 2)
 192 #       define  MC1_TRANSPARENT         (1 << 3)
 193 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 194 #       define  MC1_OE_INT_EN           (1 << 5)
 195 #       define  MC1_UART_EN             (1 << 6)
 196 #       define  MC1_MASK                0x7f
 197 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 198 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 199 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 200 #       define  MC2_BI_DI               (1 << 2)
 201 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 202 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 203 #       define  MC2_AUDIO_EN            (1 << 5)
 204 #       define  MC2_PSW_EN              (1 << 6)
 205 #       define  MC2_EN2V7               (1 << 7)
 206 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 207 #       define  OTG1_DP_PULLUP          (1 << 0)
 208 #       define  OTG1_DM_PULLUP          (1 << 1)
 209 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 210 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 211 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 212 #       define  OTG1_VBUS_DRV           (1 << 5)
 213 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 214 #       define  OTG1_VBUS_CHRG          (1 << 7)
 215 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 216 #       define  OTG_B_SESS_END          (1 << 6)
 217 #       define  OTG_B_SESS_VLD          (1 << 7)
 218
 219 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 220 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 221
 222 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 223 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 224
 225 /* same bitfields in all interrupt registers */
 226 #       define  INTR_VBUS_VLD           (1 << 0)
 227 #       define  INTR_SESS_VLD           (1 << 1)
 228 #       define  INTR_DP_HI              (1 << 2)
 229 #       define  INTR_ID_GND             (1 << 3)
 230 #       define  INTR_DM_HI              (1 << 4)
 231 #       define  INTR_ID_FLOAT           (1 << 5)
 232 #       define  INTR_BDIS_ACON          (1 << 6)
 233 #       define  INTR_CR_INT             (1 << 7)
 234
 235 /*-------------------------------------------------------------------------*/
 236
 237 static inline const char *state_name(struct isp1301 *isp)
 238 {
 239         return otg_state_string(isp->phy.state);
 240 }
 241
 242 /*-------------------------------------------------------------------------*/
 243
 244 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 245  * not everything is guarded by board-specific checks, or even using
 246  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 247  *
 248  * ALSO:  this currently doesn't use ISP1301 low-power modes
 249  * while OTG is running.
 250  */
 251
 252 static void power_down(struct isp1301 *isp)
 253 {
 254         isp->phy.state = OTG_STATE_UNDEFINED;
 255
 256         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 257         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 258
 259         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 260         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 261 }
 262
 263 static void power_up(struct isp1301 *isp)
 264 {
 265         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 266         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 267
 268         /* do this only when cpu is driving transceiver,
 269          * so host won't see a low speed device...
 270          */
 271         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 272 }
 273
 274 #define NO_HOST_SUSPEND
 275
 276 static int host_suspend(struct isp1301 *isp)
 277 {
 278 #ifdef  NO_HOST_SUSPEND
 279         return 0;
 280 #else
 281         struct device   *dev;
 282
 283         if (!isp->phy.otg->host)
 284                 return -ENODEV;
 285
 286         /* Currently ASSUMES only the OTG port matters;
 287          * other ports could be active...
 288          */
 289         dev = isp->phy.otg->host->controller;
 290         return dev->driver->suspend(dev, 3, 0);
 291 #endif
 292 }
 293
 294 static int host_resume(struct isp1301 *isp)
 295 {
 296 #ifdef  NO_HOST_SUSPEND
 297         return 0;
 298 #else
 299         struct device   *dev;
 300
 301         if (!isp->phy.otg->host)
 302                 return -ENODEV;
 303
 304         dev = isp->phy.otg->host->controller;
 305         return dev->driver->resume(dev, 0);
 306 #endif
 307 }
 308
 309 static int gadget_suspend(struct isp1301 *isp)
 310 {
 311         isp->phy.otg->gadget->b_hnp_enable = 0;
 312         isp->phy.otg->gadget->a_hnp_support = 0;
 313         isp->phy.otg->gadget->a_alt_hnp_support = 0;
 314         return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
 315 }
 316
 317 /*-------------------------------------------------------------------------*/
 318
 319 #define TIMER_MINUTES   10
 320 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 321
 322 /* Almost all our I2C messaging comes from a work queue's task context.
 323  * NOTE: guaranteeing certain response times might mean we shouldn't
 324  * share keventd's work queue; a realtime task might be safest.
 325  */
 326 static void isp1301_defer_work(struct isp1301 *isp, int work)
 327 {
 328         int status;
 329
 330         if (isp && !test_and_set_bit(work, &isp->todo)) {
 331                 (void) get_device(&isp->client->dev);
 332                 status = schedule_work(&isp->work);
 333                 if (!status && !isp->working)
 334                         dev_vdbg(&isp->client->dev,
 335                                 "work item %d may be lost\n", work);
 336         }
 337 }
 338
 339 /* called from irq handlers */
 340 static void a_idle(struct isp1301 *isp, const char *tag)
 341 {
 342         u32 l;
 343
 344         if (isp->phy.state == OTG_STATE_A_IDLE)
 345                 return;
 346
 347         isp->phy.otg->default_a = 1;
 348         if (isp->phy.otg->host) {
 349                 isp->phy.otg->host->is_b_host = 0;
 350                 host_suspend(isp);
 351         }
 352         if (isp->phy.otg->gadget) {
 353                 isp->phy.otg->gadget->is_a_peripheral = 1;
 354                 gadget_suspend(isp);
 355         }
 356         isp->phy.state = OTG_STATE_A_IDLE;
 357         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 358         omap_writel(l, OTG_CTRL);
 359         isp->last_otg_ctrl = l;
 360         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 361 }
 362
 363 /* called from irq handlers */
 364 static void b_idle(struct isp1301 *isp, const char *tag)
 365 {
 366         u32 l;
 367
 368         if (isp->phy.state == OTG_STATE_B_IDLE)
 369                 return;
 370
 371         isp->phy.otg->default_a = 0;
 372         if (isp->phy.otg->host) {
 373                 isp->phy.otg->host->is_b_host = 1;
 374                 host_suspend(isp);
 375         }
 376         if (isp->phy.otg->gadget) {
 377                 isp->phy.otg->gadget->is_a_peripheral = 0;
 378                 gadget_suspend(isp);
 379         }
 380         isp->phy.state = OTG_STATE_B_IDLE;
 381         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 382         omap_writel(l, OTG_CTRL);
 383         isp->last_otg_ctrl = l;
 384         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 385 }
 386
 387 static void
 388 dump_regs(struct isp1301 *isp, const char *label)
 389 {
 390 #ifdef  DEBUG
 391         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 392         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 393         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 394
 395         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 396                 omap_readl(OTG_CTRL), label, state_name(isp),
 397                 ctrl, status, src);
 398         /* mode control and irq enables don't change much */
 399 #endif
 400 }
 401
 402 /*-------------------------------------------------------------------------*/
 403
 404 #ifdef  CONFIG_USB_OTG
 405
 406 /*
 407  * The OMAP OTG controller handles most of the OTG state transitions.
 408  *
 409  * We translate isp1301 outputs (mostly voltage comparator status) into
 410  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 411  * flags into isp1301 inputs ... and infer state transitions.
 412  */
 413
 414 #ifdef  VERBOSE
 415
 416 static void check_state(struct isp1301 *isp, const char *tag)
 417 {
 418         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 419         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 420         unsigned                extra = 0;
 421
 422         switch (fsm) {
 423
 424         /* default-b */
 425         case 0x0:
 426                 state = OTG_STATE_B_IDLE;
 427                 break;
 428         case 0x3:
 429         case 0x7:
 430                 extra = 1;
 431         case 0x1:
 432                 state = OTG_STATE_B_PERIPHERAL;
 433                 break;
 434         case 0x11:
 435                 state = OTG_STATE_B_SRP_INIT;
 436                 break;
 437
 438         /* extra dual-role default-b states */
 439         case 0x12:
 440         case 0x13:
 441         case 0x16:
 442                 extra = 1;
 443         case 0x17:
 444                 state = OTG_STATE_B_WAIT_ACON;
 445                 break;
 446         case 0x34:
 447                 state = OTG_STATE_B_HOST;
 448                 break;
 449
 450         /* default-a */
 451         case 0x36:
 452                 state = OTG_STATE_A_IDLE;
 453                 break;
 454         case 0x3c:
 455                 state = OTG_STATE_A_WAIT_VFALL;
 456                 break;
 457         case 0x7d:
 458                 state = OTG_STATE_A_VBUS_ERR;
 459                 break;
 460         case 0x9e:
 461         case 0x9f:
 462                 extra = 1;
 463         case 0x89:
 464                 state = OTG_STATE_A_PERIPHERAL;
 465                 break;
 466         case 0xb7:
 467                 state = OTG_STATE_A_WAIT_VRISE;
 468                 break;
 469         case 0xb8:
 470                 state = OTG_STATE_A_WAIT_BCON;
 471                 break;
 472         case 0xb9:
 473                 state = OTG_STATE_A_HOST;
 474                 break;
 475         case 0xba:
 476                 state = OTG_STATE_A_SUSPEND;
 477                 break;
 478         default:
 479                 break;
 480         }
 481         if (isp->phy.state == state && !extra)
 482                 return;
 483         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 484                 otg_state_string(state), fsm, state_name(isp),
 485                 omap_readl(OTG_CTRL));
 486 }
 487
 488 #else
 489
 490 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 491
 492 #endif
 493
 494 /* outputs from ISP1301_INTERRUPT_SOURCE */
 495 static void update_otg1(struct isp1301 *isp, u8 int_src)
 496 {
 497         u32     otg_ctrl;
 498
 499         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 500         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 501         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 502
 503         if (int_src & INTR_SESS_VLD)
 504                 otg_ctrl |= OTG_ASESSVLD;
 505         else if (isp->phy.state == OTG_STATE_A_WAIT_VFALL) {
 506                 a_idle(isp, "vfall");
 507                 otg_ctrl &= ~OTG_CTRL_BITS;
 508         }
 509         if (int_src & INTR_VBUS_VLD)
 510                 otg_ctrl |= OTG_VBUSVLD;
 511         if (int_src & INTR_ID_GND) {            /* default-A */
 512                 if (isp->phy.state == OTG_STATE_B_IDLE
 513                                 || isp->phy.state
 514                                         == OTG_STATE_UNDEFINED) {
 515                         a_idle(isp, "init");
 516                         return;
 517                 }
 518         } else {                                /* default-B */
 519                 otg_ctrl |= OTG_ID;
 520                 if (isp->phy.state == OTG_STATE_A_IDLE
 521                         || isp->phy.state == OTG_STATE_UNDEFINED) {
 522                         b_idle(isp, "init");
 523                         return;
 524                 }
 525         }
 526         omap_writel(otg_ctrl, OTG_CTRL);
 527 }
 528
 529 /* outputs from ISP1301_OTG_STATUS */
 530 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 531 {
 532         u32     otg_ctrl;
 533
 534         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 535         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 536         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 537         if (otg_status & OTG_B_SESS_VLD)
 538                 otg_ctrl |= OTG_BSESSVLD;
 539         else if (otg_status & OTG_B_SESS_END)
 540                 otg_ctrl |= OTG_BSESSEND;
 541         omap_writel(otg_ctrl, OTG_CTRL);
 542 }
 543
 544 /* inputs going to ISP1301 */
 545 static void otg_update_isp(struct isp1301 *isp)
 546 {
 547         u32     otg_ctrl, otg_change;
 548         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 549
 550         otg_ctrl = omap_readl(OTG_CTRL);
 551         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 552         isp->last_otg_ctrl = otg_ctrl;
 553         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 554
 555         switch (isp->phy.state) {
 556         case OTG_STATE_B_IDLE:
 557         case OTG_STATE_B_PERIPHERAL:
 558         case OTG_STATE_B_SRP_INIT:
 559                 if (!(otg_ctrl & OTG_PULLUP)) {
 560                         // if (otg_ctrl & OTG_B_HNPEN) {
 561                         if (isp->phy.otg->gadget->b_hnp_enable) {
 562                                 isp->phy.state = OTG_STATE_B_WAIT_ACON;
 563                                 pr_debug("  --> b_wait_acon\n");
 564                         }
 565                         goto pulldown;
 566                 }
 567 pullup:
 568                 set |= OTG1_DP_PULLUP;
 569                 clr |= OTG1_DP_PULLDOWN;
 570                 break;
 571         case OTG_STATE_A_SUSPEND:
 572         case OTG_STATE_A_PERIPHERAL:
 573                 if (otg_ctrl & OTG_PULLUP)
 574                         goto pullup;
 575                 /* FALLTHROUGH */
 576         // case OTG_STATE_B_WAIT_ACON:
 577         default:
 578 pulldown:
 579                 set |= OTG1_DP_PULLDOWN;
 580                 clr |= OTG1_DP_PULLUP;
 581                 break;
 582         }
 583
 584 #       define toggle(OTG,ISP) do { \
 585                 if (otg_ctrl & OTG) set |= ISP; \
 586                 else clr |= ISP; \
 587                 } while (0)
 588
 589         if (!(isp->phy.otg->host))
 590                 otg_ctrl &= ~OTG_DRV_VBUS;
 591
 592         switch (isp->phy.state) {
 593         case OTG_STATE_A_SUSPEND:
 594                 if (otg_ctrl & OTG_DRV_VBUS) {
 595                         set |= OTG1_VBUS_DRV;
 596                         break;
 597                 }
 598                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 599                 notresponding(isp);
 600
 601                 /* FALLTHROUGH */
 602         case OTG_STATE_A_VBUS_ERR:
 603                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
 604                 pr_debug("  --> a_wait_vfall\n");
 605                 /* FALLTHROUGH */
 606         case OTG_STATE_A_WAIT_VFALL:
 607                 /* FIXME usbcore thinks port power is still on ... */
 608                 clr |= OTG1_VBUS_DRV;
 609                 break;
 610         case OTG_STATE_A_IDLE:
 611                 if (otg_ctrl & OTG_DRV_VBUS) {
 612                         isp->phy.state = OTG_STATE_A_WAIT_VRISE;
 613                         pr_debug("  --> a_wait_vrise\n");
 614                 }
 615                 /* FALLTHROUGH */
 616         default:
 617                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 618         }
 619
 620         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 621         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 622
 623 #       undef toggle
 624
 625         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 626         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 627
 628         /* HNP switch to host or peripheral; and SRP */
 629         if (otg_change & OTG_PULLUP) {
 630                 u32 l;
 631
 632                 switch (isp->phy.state) {
 633                 case OTG_STATE_B_IDLE:
 634                         if (clr & OTG1_DP_PULLUP)
 635                                 break;
 636                         isp->phy.state = OTG_STATE_B_PERIPHERAL;
 637                         pr_debug("  --> b_peripheral\n");
 638                         break;
 639                 case OTG_STATE_A_SUSPEND:
 640                         if (clr & OTG1_DP_PULLUP)
 641                                 break;
 642                         isp->phy.state = OTG_STATE_A_PERIPHERAL;
 643                         pr_debug("  --> a_peripheral\n");
 644                         break;
 645                 default:
 646                         break;
 647                 }
 648                 l = omap_readl(OTG_CTRL);
 649                 l |= OTG_PULLUP;
 650                 omap_writel(l, OTG_CTRL);
 651         }
 652
 653         check_state(isp, __func__);
 654         dump_regs(isp, "otg->isp1301");
 655 }
 656
 657 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 658 {
 659         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 660         u32             otg_ctrl;
 661         int             ret = IRQ_NONE;
 662         struct isp1301  *isp = _isp;
 663         struct usb_otg  *otg = isp->phy.otg;
 664
 665         /* update ISP1301 transceiver from OTG controller */
 666         if (otg_irq & OPRT_CHG) {
 667                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 668                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 669                 ret = IRQ_HANDLED;
 670
 671         /* SRP to become b_peripheral failed */
 672         } else if (otg_irq & B_SRP_TMROUT) {
 673                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 674                 notresponding(isp);
 675
 676                 /* gadget drivers that care should monitor all kinds of
 677                  * remote wakeup (SRP, normal) using their own timer
 678                  * to give "check cable and A-device" messages.
 679                  */
 680                 if (isp->phy.state == OTG_STATE_B_SRP_INIT)
 681                         b_idle(isp, "srp_timeout");
 682
 683                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 684                 ret = IRQ_HANDLED;
 685
 686         /* HNP to become b_host failed */
 687         } else if (otg_irq & B_HNP_FAIL) {
 688                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 689                                 state_name(isp), omap_readl(OTG_CTRL));
 690                 notresponding(isp);
 691
 692                 otg_ctrl = omap_readl(OTG_CTRL);
 693                 otg_ctrl |= OTG_BUSDROP;
 694                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 695                 omap_writel(otg_ctrl, OTG_CTRL);
 696
 697                 /* subset of b_peripheral()... */
 698                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
 699                 pr_debug("  --> b_peripheral\n");
 700
 701                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 702                 ret = IRQ_HANDLED;
 703
 704         /* detect SRP from B-device ... */
 705         } else if (otg_irq & A_SRP_DETECT) {
 706                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 707                                 state_name(isp), omap_readl(OTG_CTRL));
 708
 709                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 710                 switch (isp->phy.state) {
 711                 case OTG_STATE_A_IDLE:
 712                         if (!otg->host)
 713                                 break;
 714                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 715                         otg_ctrl = omap_readl(OTG_CTRL);
 716                         otg_ctrl |= OTG_A_BUSREQ;
 717                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 718                                         & ~OTG_XCEIV_INPUTS
 719                                         & OTG_CTRL_MASK;
 720                         omap_writel(otg_ctrl, OTG_CTRL);
 721                         break;
 722                 default:
 723                         break;
 724                 }
 725
 726                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 727                 ret = IRQ_HANDLED;
 728
 729         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 730          * we don't track them separately
 731          */
 732         } else if (otg_irq & A_REQ_TMROUT) {
 733                 otg_ctrl = omap_readl(OTG_CTRL);
 734                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 735                                 state_name(isp), otg_ctrl);
 736                 notresponding(isp);
 737
 738                 otg_ctrl |= OTG_BUSDROP;
 739                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 740                 omap_writel(otg_ctrl, OTG_CTRL);
 741                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
 742
 743                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 744                 ret = IRQ_HANDLED;
 745
 746         /* A-supplied voltage fell too low; overcurrent */
 747         } else if (otg_irq & A_VBUS_ERR) {
 748                 otg_ctrl = omap_readl(OTG_CTRL);
 749                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 750                         state_name(isp), otg_irq, otg_ctrl);
 751
 752                 otg_ctrl |= OTG_BUSDROP;
 753                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 754                 omap_writel(otg_ctrl, OTG_CTRL);
 755                 isp->phy.state = OTG_STATE_A_VBUS_ERR;
 756
 757                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 758                 ret = IRQ_HANDLED;
 759
 760         /* switch driver; the transceiver code activates it,
 761          * ungating the udc clock or resuming OHCI.
 762          */
 763         } else if (otg_irq & DRIVER_SWITCH) {
 764                 int     kick = 0;
 765
 766                 otg_ctrl = omap_readl(OTG_CTRL);
 767                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 768                                 state_name(isp),
 769                                 (otg_ctrl & OTG_DRIVER_SEL)
 770                                         ? "gadget" : "host",
 771                                 otg_ctrl);
 772                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 773
 774                 /* role is peripheral */
 775                 if (otg_ctrl & OTG_DRIVER_SEL) {
 776                         switch (isp->phy.state) {
 777                         case OTG_STATE_A_IDLE:
 778                                 b_idle(isp, __func__);
 779                                 break;
 780                         default:
 781                                 break;
 782                         }
 783                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 784
 785                 /* role is host */
 786                 } else {
 787                         if (!(otg_ctrl & OTG_ID)) {
 788                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 789                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 790                         }
 791
 792                         if (otg->host) {
 793                                 switch (isp->phy.state) {
 794                                 case OTG_STATE_B_WAIT_ACON:
 795                                         isp->phy.state = OTG_STATE_B_HOST;
 796                                         pr_debug("  --> b_host\n");
 797                                         kick = 1;
 798                                         break;
 799                                 case OTG_STATE_A_WAIT_BCON:
 800                                         isp->phy.state = OTG_STATE_A_HOST;
 801                                         pr_debug("  --> a_host\n");
 802                                         break;
 803                                 case OTG_STATE_A_PERIPHERAL:
 804                                         isp->phy.state = OTG_STATE_A_WAIT_BCON;
 805                                         pr_debug("  --> a_wait_bcon\n");
 806                                         break;
 807                                 default:
 808                                         break;
 809                                 }
 810                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 811                         }
 812                 }
 813
 814                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 815                 ret = IRQ_HANDLED;
 816
 817                 if (kick)
 818                         usb_bus_start_enum(otg->host, otg->host->otg_port);
 819         }
 820
 821         check_state(isp, __func__);
 822         return ret;
 823 }
 824
 825 static struct platform_device *otg_dev;
 826
 827 static int isp1301_otg_init(struct isp1301 *isp)
 828 {
 829         u32 l;
 830
 831         if (!otg_dev)
 832                 return -ENODEV;
 833
 834         dump_regs(isp, __func__);
 835         /* some of these values are board-specific... */
 836         l = omap_readl(OTG_SYSCON_2);
 837         l |= OTG_EN
 838                 /* for B-device: */
 839                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 840                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 841                 // | (3 << 24)          /* 2msec VBUS pulse */
 842                 /* for A-device: */
 843                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 844                 | SRP_DPW               /* detect 167+ns SRP pulses */
 845                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 846                 ;
 847         omap_writel(l, OTG_SYSCON_2);
 848
 849         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 850         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 851
 852         check_state(isp, __func__);
 853         pr_debug("otg: %s, %s %06x\n",
 854                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 855
 856         omap_writew(DRIVER_SWITCH | OPRT_CHG
 857                         | B_SRP_TMROUT | B_HNP_FAIL
 858                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 859
 860         l = omap_readl(OTG_SYSCON_2);
 861         l |= OTG_EN;
 862         omap_writel(l, OTG_SYSCON_2);
 863
 864         return 0;
 865 }
 866
 867 static int otg_probe(struct platform_device *dev)
 868 {
 869         // struct omap_usb_config *config = dev->platform_data;
 870
 871         otg_dev = dev;
 872         return 0;
 873 }
 874
 875 static int otg_remove(struct platform_device *dev)
 876 {
 877         otg_dev = NULL;
 878         return 0;
 879 }
 880
 881 static struct platform_driver omap_otg_driver = {
 882         .probe          = otg_probe,
 883         .remove         = otg_remove,
 884         .driver         = {
 885                 .owner  = THIS_MODULE,
 886                 .name   = "omap_otg",
 887         },
 888 };
 889
 890 static int otg_bind(struct isp1301 *isp)
 891 {
 892         int     status;
 893
 894         if (otg_dev)
 895                 return -EBUSY;
 896
 897         status = platform_driver_register(&omap_otg_driver);
 898         if (status < 0)
 899                 return status;
 900
 901         if (otg_dev)
 902                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 903                                 0, DRIVER_NAME, isp);
 904         else
 905                 status = -ENODEV;
 906
 907         if (status < 0)
 908                 platform_driver_unregister(&omap_otg_driver);
 909         return status;
 910 }
 911
 912 static void otg_unbind(struct isp1301 *isp)
 913 {
 914         if (!otg_dev)
 915                 return;
 916         free_irq(otg_dev->resource[1].start, isp);
 917 }
 918
 919 #else
 920
 921 /* OTG controller isn't clocked */
 922
 923 #endif  /* CONFIG_USB_OTG */
 924
 925 /*-------------------------------------------------------------------------*/
 926
 927 static void b_peripheral(struct isp1301 *isp)
 928 {
 929         u32 l;
 930
 931         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 932         omap_writel(l, OTG_CTRL);
 933
 934         usb_gadget_vbus_connect(isp->phy.otg->gadget);
 935
 936 #ifdef  CONFIG_USB_OTG
 937         enable_vbus_draw(isp, 8);
 938         otg_update_isp(isp);
 939 #else
 940         enable_vbus_draw(isp, 100);
 941         /* UDC driver just set OTG_BSESSVLD */
 942         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 943         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 944         isp->phy.state = OTG_STATE_B_PERIPHERAL;
 945         pr_debug("  --> b_peripheral\n");
 946         dump_regs(isp, "2periph");
 947 #endif
 948 }
 949
 950 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 951 {
 952         struct usb_otg          *otg = isp->phy.otg;
 953         u8                      isp_stat, isp_bstat;
 954         enum usb_otg_state      state = isp->phy.state;
 955
 956         if (stat & INTR_BDIS_ACON)
 957                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 958
 959         /* start certain state transitions right away */
 960         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 961         if (isp_stat & INTR_ID_GND) {
 962                 if (otg->default_a) {
 963                         switch (state) {
 964                         case OTG_STATE_B_IDLE:
 965                                 a_idle(isp, "idle");
 966                                 /* FALLTHROUGH */
 967                         case OTG_STATE_A_IDLE:
 968                                 enable_vbus_source(isp);
 969                                 /* FALLTHROUGH */
 970                         case OTG_STATE_A_WAIT_VRISE:
 971                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 972                                  * the HC will transition to A_HOST (or
 973                                  * A_SUSPEND!) without our noticing except
 974                                  * when HNP is used.
 975                                  */
 976                                 if (isp_stat & INTR_VBUS_VLD)
 977                                         isp->phy.state = OTG_STATE_A_HOST;
 978                                 break;
 979                         case OTG_STATE_A_WAIT_VFALL:
 980                                 if (!(isp_stat & INTR_SESS_VLD))
 981                                         a_idle(isp, "vfell");
 982                                 break;
 983                         default:
 984                                 if (!(isp_stat & INTR_VBUS_VLD))
 985                                         isp->phy.state = OTG_STATE_A_VBUS_ERR;
 986                                 break;
 987                         }
 988                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 989                 } else {
 990                         switch (state) {
 991                         case OTG_STATE_B_PERIPHERAL:
 992                         case OTG_STATE_B_HOST:
 993                         case OTG_STATE_B_WAIT_ACON:
 994                                 usb_gadget_vbus_disconnect(otg->gadget);
 995                                 break;
 996                         default:
 997                                 break;
 998                         }
 999                         if (state != OTG_STATE_A_IDLE)
1000                                 a_idle(isp, "id");
1001                         if (otg->host && state == OTG_STATE_A_IDLE)
1002                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1003                         isp_bstat = 0;
1004                 }
1005         } else {
1006                 u32 l;
1007
1008                 /* if user unplugged mini-A end of cable,
1009                  * don't bypass A_WAIT_VFALL.
1010                  */
1011                 if (otg->default_a) {
1012                         switch (state) {
1013                         default:
1014                                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
1015                                 break;
1016                         case OTG_STATE_A_WAIT_VFALL:
1017                                 state = OTG_STATE_A_IDLE;
1018                                 /* khubd may take a while to notice and
1019                                  * handle this disconnect, so don't go
1020                                  * to B_IDLE quite yet.
1021                                  */
1022                                 break;
1023                         case OTG_STATE_A_IDLE:
1024                                 host_suspend(isp);
1025                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1026                                                 MC1_BDIS_ACON_EN);
1027                                 isp->phy.state = OTG_STATE_B_IDLE;
1028                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1029                                 l &= ~OTG_CTRL_BITS;
1030                                 omap_writel(l, OTG_CTRL);
1031                                 break;
1032                         case OTG_STATE_B_IDLE:
1033                                 break;
1034                         }
1035                 }
1036                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1037
1038                 switch (isp->phy.state) {
1039                 case OTG_STATE_B_PERIPHERAL:
1040                 case OTG_STATE_B_WAIT_ACON:
1041                 case OTG_STATE_B_HOST:
1042                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1043                                 break;
1044                         enable_vbus_draw(isp, 0);
1045 #ifndef CONFIG_USB_OTG
1046                         /* UDC driver will clear OTG_BSESSVLD */
1047                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1048                                                 OTG1_DP_PULLDOWN);
1049                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1050                                                 OTG1_DP_PULLUP);
1051                         dump_regs(isp, __func__);
1052 #endif
1053                         /* FALLTHROUGH */
1054                 case OTG_STATE_B_SRP_INIT:
1055                         b_idle(isp, __func__);
1056                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1057                         omap_writel(l, OTG_CTRL);
1058                         /* FALLTHROUGH */
1059                 case OTG_STATE_B_IDLE:
1060                         if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1061 #ifdef  CONFIG_USB_OTG
1062                                 update_otg1(isp, isp_stat);
1063                                 update_otg2(isp, isp_bstat);
1064 #endif
1065                                 b_peripheral(isp);
1066                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1067                                 isp_bstat |= OTG_B_SESS_END;
1068                         break;
1069                 case OTG_STATE_A_WAIT_VFALL:
1070                         break;
1071                 default:
1072                         pr_debug("otg: unsupported b-device %s\n",
1073                                 state_name(isp));
1074                         break;
1075                 }
1076         }
1077
1078         if (state != isp->phy.state)
1079                 pr_debug("  isp, %s -> %s\n",
1080                                 otg_state_string(state), state_name(isp));
1081
1082 #ifdef  CONFIG_USB_OTG
1083         /* update the OTG controller state to match the isp1301; may
1084          * trigger OPRT_CHG irqs for changes going to the isp1301.
1085          */
1086         update_otg1(isp, isp_stat);
1087         update_otg2(isp, isp_bstat);
1088         check_state(isp, __func__);
1089 #endif
1090
1091         dump_regs(isp, "isp1301->otg");
1092 }
1093
1094 /*-------------------------------------------------------------------------*/
1095
1096 static u8 isp1301_clear_latch(struct isp1301 *isp)
1097 {
1098         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1099         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1100         return latch;
1101 }
1102
1103 static void
1104 isp1301_work(struct work_struct *work)
1105 {
1106         struct isp1301  *isp = container_of(work, struct isp1301, work);
1107         int             stop;
1108
1109         /* implicit lock:  we're the only task using this device */
1110         isp->working = 1;
1111         do {
1112                 stop = test_bit(WORK_STOP, &isp->todo);
1113
1114 #ifdef  CONFIG_USB_OTG
1115                 /* transfer state from otg engine to isp1301 */
1116                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1117                         otg_update_isp(isp);
1118                         put_device(&isp->client->dev);
1119                 }
1120 #endif
1121                 /* transfer state from isp1301 to otg engine */
1122                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1123                         u8              stat = isp1301_clear_latch(isp);
1124
1125                         isp_update_otg(isp, stat);
1126                         put_device(&isp->client->dev);
1127                 }
1128
1129                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1130                         u32     otg_ctrl;
1131
1132                         /*
1133                          * skip A_WAIT_VRISE; hc transitions invisibly
1134                          * skip A_WAIT_BCON; same.
1135                          */
1136                         switch (isp->phy.state) {
1137                         case OTG_STATE_A_WAIT_BCON:
1138                         case OTG_STATE_A_WAIT_VRISE:
1139                                 isp->phy.state = OTG_STATE_A_HOST;
1140                                 pr_debug("  --> a_host\n");
1141                                 otg_ctrl = omap_readl(OTG_CTRL);
1142                                 otg_ctrl |= OTG_A_BUSREQ;
1143                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1144                                                 & OTG_CTRL_MASK;
1145                                 omap_writel(otg_ctrl, OTG_CTRL);
1146                                 break;
1147                         case OTG_STATE_B_WAIT_ACON:
1148                                 isp->phy.state = OTG_STATE_B_HOST;
1149                                 pr_debug("  --> b_host (acon)\n");
1150                                 break;
1151                         case OTG_STATE_B_HOST:
1152                         case OTG_STATE_B_IDLE:
1153                         case OTG_STATE_A_IDLE:
1154                                 break;
1155                         default:
1156                                 pr_debug("  host resume in %s\n",
1157                                                 state_name(isp));
1158                         }
1159                         host_resume(isp);
1160                         // mdelay(10);
1161                         put_device(&isp->client->dev);
1162                 }
1163
1164                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1165 #ifdef  VERBOSE
1166                         dump_regs(isp, "timer");
1167                         if (!stop)
1168                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1169 #endif
1170                         put_device(&isp->client->dev);
1171                 }
1172
1173                 if (isp->todo)
1174                         dev_vdbg(&isp->client->dev,
1175                                 "work done, todo = 0x%lx\n",
1176                                 isp->todo);
1177                 if (stop) {
1178                         dev_dbg(&isp->client->dev, "stop\n");
1179                         break;
1180                 }
1181         } while (isp->todo);
1182         isp->working = 0;
1183 }
1184
1185 static irqreturn_t isp1301_irq(int irq, void *isp)
1186 {
1187         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1188         return IRQ_HANDLED;
1189 }
1190
1191 static void isp1301_timer(unsigned long _isp)
1192 {
1193         isp1301_defer_work((void *)_isp, WORK_TIMER);
1194 }
1195
1196 /*-------------------------------------------------------------------------*/
1197
1198 static void isp1301_release(struct device *dev)
1199 {
1200         struct isp1301  *isp;
1201
1202         isp = dev_get_drvdata(dev);
1203
1204         /* FIXME -- not with a "new style" driver, it doesn't!! */
1205
1206         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1207         if (isp->i2c_release)
1208                 isp->i2c_release(dev);
1209         kfree(isp->phy.otg);
1210         kfree (isp);
1211 }
1212
1213 static struct isp1301 *the_transceiver;
1214
1215 static int __exit isp1301_remove(struct i2c_client *i2c)
1216 {
1217         struct isp1301  *isp;
1218
1219         isp = i2c_get_clientdata(i2c);
1220
1221         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1222         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1223         free_irq(i2c->irq, isp);
1224 #ifdef  CONFIG_USB_OTG
1225         otg_unbind(isp);
1226 #endif
1227         if (machine_is_omap_h2())
1228                 gpio_free(2);
1229
1230         isp->timer.data = 0;
1231         set_bit(WORK_STOP, &isp->todo);
1232         del_timer_sync(&isp->timer);
1233         flush_work_sync(&isp->work);
1234
1235         put_device(&i2c->dev);
1236         the_transceiver = NULL;
1237
1238         return 0;
1239 }
1240
1241 /*-------------------------------------------------------------------------*/
1242
1243 /* NOTE:  three modes are possible here, only one of which
1244  * will be standards-conformant on any given system:
1245  *
1246  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1247  *  - HOST mode, for when there's one or more A (host) connectors
1248  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1249  *
1250  * As a rule, you won't have an isp1301 chip unless it's there to
1251  * support the OTG mode.  Other modes help testing USB controllers
1252  * in isolation from (full) OTG support, or maybe so later board
1253  * revisions can help to support those feature.
1254  */
1255
1256 #ifdef  CONFIG_USB_OTG
1257
1258 static int isp1301_otg_enable(struct isp1301 *isp)
1259 {
1260         power_up(isp);
1261         isp1301_otg_init(isp);
1262
1263         /* NOTE:  since we don't change this, this provides
1264          * a few more interrupts than are strictly needed.
1265          */
1266         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1267                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1268         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1269                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1270
1271         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1272
1273         return 0;
1274 }
1275
1276 #endif
1277
1278 /* add or disable the host device+driver */
1279 static int
1280 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1281 {
1282         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1283
1284         if (!otg || isp != the_transceiver)
1285                 return -ENODEV;
1286
1287         if (!host) {
1288                 omap_writew(0, OTG_IRQ_EN);
1289                 power_down(isp);
1290                 otg->host = NULL;
1291                 return 0;
1292         }
1293
1294 #ifdef  CONFIG_USB_OTG
1295         otg->host = host;
1296         dev_dbg(&isp->client->dev, "registered host\n");
1297         host_suspend(isp);
1298         if (otg->gadget)
1299                 return isp1301_otg_enable(isp);
1300         return 0;
1301
1302 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1303         // FIXME update its refcount
1304         otg->host = host;
1305
1306         power_up(isp);
1307
1308         if (machine_is_omap_h2())
1309                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1310
1311         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1312         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1313                 INTR_ID_GND);
1314         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1315                 INTR_ID_GND);
1316
1317         /* If this has a Mini-AB connector, this mode is highly
1318          * nonstandard ... but can be handy for testing, especially with
1319          * the Mini-A end of an OTG cable.  (Or something nonstandard
1320          * like MiniB-to-StandardB, maybe built with a gender mender.)
1321          */
1322         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1323
1324         dump_regs(isp, __func__);
1325
1326         return 0;
1327
1328 #else
1329         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1330         return -EINVAL;
1331 #endif
1332
1333 }
1334
1335 static int
1336 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1337 {
1338         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1339
1340         if (!otg || isp != the_transceiver)
1341                 return -ENODEV;
1342
1343         if (!gadget) {
1344                 omap_writew(0, OTG_IRQ_EN);
1345                 if (!otg->default_a)
1346                         enable_vbus_draw(isp, 0);
1347                 usb_gadget_vbus_disconnect(otg->gadget);
1348                 otg->gadget = NULL;
1349                 power_down(isp);
1350                 return 0;
1351         }
1352
1353 #ifdef  CONFIG_USB_OTG
1354         otg->gadget = gadget;
1355         dev_dbg(&isp->client->dev, "registered gadget\n");
1356         /* gadget driver may be suspended until vbus_connect () */
1357         if (otg->host)
1358                 return isp1301_otg_enable(isp);
1359         return 0;
1360
1361 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1362         otg->gadget = gadget;
1363         // FIXME update its refcount
1364
1365         {
1366                 u32 l;
1367
1368                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1369                 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1370                 l |= OTG_ID;
1371                 omap_writel(l, OTG_CTRL);
1372         }
1373
1374         power_up(isp);
1375         isp->phy.state = OTG_STATE_B_IDLE;
1376
1377         if (machine_is_omap_h2() || machine_is_omap_h3())
1378                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1379
1380         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1381                 INTR_SESS_VLD);
1382         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1383                 INTR_VBUS_VLD);
1384         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1385         dump_regs(isp, __func__);
1386
1387         /* If this has a Mini-AB connector, this mode is highly
1388          * nonstandard ... but can be handy for testing, so long
1389          * as you don't plug a Mini-A cable into the jack.
1390          */
1391         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1392                 b_peripheral(isp);
1393
1394         return 0;
1395
1396 #else
1397         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1398         return -EINVAL;
1399 #endif
1400 }
1401
1402
1403 /*-------------------------------------------------------------------------*/
1404
1405 static int
1406 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1407 {
1408         if (!the_transceiver)
1409                 return -ENODEV;
1410         if (dev->state == OTG_STATE_B_PERIPHERAL)
1411                 enable_vbus_draw(the_transceiver, mA);
1412         return 0;
1413 }
1414
1415 static int
1416 isp1301_start_srp(struct usb_otg *otg)
1417 {
1418         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1419         u32             otg_ctrl;
1420
1421         if (!otg || isp != the_transceiver
1422                         || isp->phy.state != OTG_STATE_B_IDLE)
1423                 return -ENODEV;
1424
1425         otg_ctrl = omap_readl(OTG_CTRL);
1426         if (!(otg_ctrl & OTG_BSESSEND))
1427                 return -EINVAL;
1428
1429         otg_ctrl |= OTG_B_BUSREQ;
1430         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1431         omap_writel(otg_ctrl, OTG_CTRL);
1432         isp->phy.state = OTG_STATE_B_SRP_INIT;
1433
1434         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1435                         omap_readl(OTG_CTRL));
1436 #ifdef  CONFIG_USB_OTG
1437         check_state(isp, __func__);
1438 #endif
1439         return 0;
1440 }
1441
1442 static int
1443 isp1301_start_hnp(struct usb_otg *otg)
1444 {
1445 #ifdef  CONFIG_USB_OTG
1446         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1447         u32 l;
1448
1449         if (!otg || isp != the_transceiver)
1450                 return -ENODEV;
1451         if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1452                 return -ENOTCONN;
1453         if (!otg->default_a && (otg->gadget == NULL
1454                         || !otg->gadget->b_hnp_enable))
1455                 return -ENOTCONN;
1456
1457         /* We want hardware to manage most HNP protocol timings.
1458          * So do this part as early as possible...
1459          */
1460         switch (isp->phy.state) {
1461         case OTG_STATE_B_HOST:
1462                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
1463                 /* caller will suspend next */
1464                 break;
1465         case OTG_STATE_A_HOST:
1466 #if 0
1467                 /* autoconnect mode avoids irq latency bugs */
1468                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1469                                 MC1_BDIS_ACON_EN);
1470 #endif
1471                 /* caller must suspend then clear A_BUSREQ */
1472                 usb_gadget_vbus_connect(otg->gadget);
1473                 l = omap_readl(OTG_CTRL);
1474                 l |= OTG_A_SETB_HNPEN;
1475                 omap_writel(l, OTG_CTRL);
1476
1477                 break;
1478         case OTG_STATE_A_PERIPHERAL:
1479                 /* initiated by B-Host suspend */
1480                 break;
1481         default:
1482                 return -EILSEQ;
1483         }
1484         pr_debug("otg: HNP %s, %06x ...\n",
1485                 state_name(isp), omap_readl(OTG_CTRL));
1486         check_state(isp, __func__);
1487         return 0;
1488 #else
1489         /* srp-only */
1490         return -EINVAL;
1491 #endif
1492 }
1493
1494 /*-------------------------------------------------------------------------*/
1495
1496 static int __devinit
1497 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1498 {
1499         int                     status;
1500         struct isp1301          *isp;
1501
1502         if (the_transceiver)
1503                 return 0;
1504
1505         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1506         if (!isp)
1507                 return 0;
1508
1509         isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1510         if (!isp->phy.otg) {
1511                 kfree(isp);
1512                 return 0;
1513         }
1514
1515         INIT_WORK(&isp->work, isp1301_work);
1516         init_timer(&isp->timer);
1517         isp->timer.function = isp1301_timer;
1518         isp->timer.data = (unsigned long) isp;
1519
1520         i2c_set_clientdata(i2c, isp);
1521         isp->client = i2c;
1522
1523         /* verify the chip (shouldn't be necessary) */
1524         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1525         if (status != I2C_VENDOR_ID_PHILIPS) {
1526                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1527                 goto fail;
1528         }
1529         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1530         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1531                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1532                 goto fail;
1533         }
1534         isp->i2c_release = i2c->dev.release;
1535         i2c->dev.release = isp1301_release;
1536
1537         /* initial development used chiprev 2.00 */
1538         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1539         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1540                 status >> 8, status & 0xff);
1541
1542         /* make like power-on reset */
1543         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1544
1545         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1546         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1547
1548         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1549                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1550         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1551                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1552
1553         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1554         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1555         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1556
1557 #ifdef  CONFIG_USB_OTG
1558         status = otg_bind(isp);
1559         if (status < 0) {
1560                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1561                 goto fail;
1562         }
1563 #endif
1564
1565         if (machine_is_omap_h2()) {
1566                 /* full speed signaling by default */
1567                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1568                         MC1_SPEED);
1569                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1570                         MC2_SPD_SUSP_CTRL);
1571
1572                 /* IRQ wired at M14 */
1573                 omap_cfg_reg(M14_1510_GPIO2);
1574                 if (gpio_request(2, "isp1301") == 0)
1575                         gpio_direction_input(2);
1576                 isp->irq_type = IRQF_TRIGGER_FALLING;
1577         }
1578
1579         status = request_irq(i2c->irq, isp1301_irq,
1580                         isp->irq_type, DRIVER_NAME, isp);
1581         if (status < 0) {
1582                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1583                                 i2c->irq, status);
1584                 goto fail;
1585         }
1586
1587         isp->phy.dev = &i2c->dev;
1588         isp->phy.label = DRIVER_NAME;
1589         isp->phy.set_power = isp1301_set_power,
1590
1591         isp->phy.otg->phy = &isp->phy;
1592         isp->phy.otg->set_host = isp1301_set_host,
1593         isp->phy.otg->set_peripheral = isp1301_set_peripheral,
1594         isp->phy.otg->start_srp = isp1301_start_srp,
1595         isp->phy.otg->start_hnp = isp1301_start_hnp,
1596
1597         enable_vbus_draw(isp, 0);
1598         power_down(isp);
1599         the_transceiver = isp;
1600
1601 #ifdef  CONFIG_USB_OTG
1602         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1603         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1604 #endif
1605
1606         dump_regs(isp, __func__);
1607
1608 #ifdef  VERBOSE
1609         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1610         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1611 #endif
1612
1613         status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1614         if (status < 0)
1615                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1616                         status);
1617
1618         return 0;
1619
1620 fail:
1621         kfree(isp->phy.otg);
1622         kfree(isp);
1623         return -ENODEV;
1624 }
1625
1626 static const struct i2c_device_id isp1301_id[] = {
1627         { "isp1301_omap", 0 },
1628         { }
1629 };
1630 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1631
1632 static struct i2c_driver isp1301_driver = {
1633         .driver = {
1634                 .name   = "isp1301_omap",
1635         },
1636         .probe          = isp1301_probe,
1637         .remove         = __exit_p(isp1301_remove),
1638         .id_table       = isp1301_id,
1639 };
1640
1641 /*-------------------------------------------------------------------------*/
1642
1643 static int __init isp_init(void)
1644 {
1645         return i2c_add_driver(&isp1301_driver);
1646 }
1647 subsys_initcall(isp_init);
1648
1649 static void __exit isp_exit(void)
1650 {
1651         if (the_transceiver)
1652                 usb_remove_phy(&the_transceiver->phy);
1653         i2c_del_driver(&isp1301_driver);
1654 }
1655 module_exit(isp_exit);
1656