drivers/usb/phy/phy-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/mux.h>
  40
  41 #include <mach/usb.h>
  42
  43 #undef VERBOSE
  44
  45
  46 #define DRIVER_VERSION  "24 August 2004"
  47 #define DRIVER_NAME     (isp1301_driver.driver.name)
  48
  49 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  50 MODULE_LICENSE("GPL");
  51
  52 struct isp1301 {
  53         struct usb_phy          phy;
  54         struct i2c_client       *client;
  55         void                    (*i2c_release)(struct device *dev);
  56
  57         int                     irq_type;
  58
  59         u32                     last_otg_ctrl;
  60         unsigned                working:1;
  61
  62         struct timer_list       timer;
  63
  64         /* use keventd context to change the state for us */
  65         struct work_struct      work;
  66
  67         unsigned long           todo;
  68 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  69 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  70 #               define WORK_HOST_RESUME 4       /* resume host */
  71 #               define WORK_TIMER       6       /* timer fired */
  72 #               define WORK_STOP        7       /* don't resubmit */
  73 };
  74
  75
  76 /* bits in OTG_CTRL */
  77
  78 #define OTG_XCEIV_OUTPUTS \
  79         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  80 #define OTG_XCEIV_INPUTS \
  81         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  82 #define OTG_CTRL_BITS \
  83         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  84         /* and OTG_PULLUP is sometimes written */
  85
  86 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  87         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  88         OTG_CTRL_BITS)
  89
  90
  91 /*-------------------------------------------------------------------------*/
  92
  93 /* board-specific PM hooks */
  94
  95 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  96
  97 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
  98
  99 #include <linux/i2c/tps65010.h>
 100
 101 #else
 102
 103 static inline int tps65010_set_vbus_draw(unsigned mA)
 104 {
 105         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
 106         return 0;
 107 }
 108
 109 #endif
 110
 111 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 112 {
 113         int status = tps65010_set_vbus_draw(mA);
 114         if (status < 0)
 115                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 116 }
 117
 118 #else
 119
 120 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 121 {
 122         /* H4 controls this by DIP switch S2.4; no soft control.
 123          * ON means the charger is always enabled.  Leave it OFF
 124          * unless the OTG port is used only in B-peripheral mode.
 125          */
 126 }
 127
 128 #endif
 129
 130 static void enable_vbus_source(struct isp1301 *isp)
 131 {
 132         /* this board won't supply more than 8mA vbus power.
 133          * some boards can switch a 100ma "unit load" (or more).
 134          */
 135 }
 136
 137
 138 /* products will deliver OTG messages with LEDs, GUI, etc */
 139 static inline void notresponding(struct isp1301 *isp)
 140 {
 141         printk(KERN_NOTICE "OTG device not responding.\n");
 142 }
 143
 144
 145 /*-------------------------------------------------------------------------*/
 146
 147 static struct i2c_driver isp1301_driver;
 148
 149 /* smbus apis are used for portability */
 150
 151 static inline u8
 152 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 153 {
 154         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 155 }
 156
 157 static inline int
 158 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 159 {
 160         return i2c_smbus_read_word_data(isp->client, reg);
 161 }
 162
 163 static inline int
 164 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 165 {
 166         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 167 }
 168
 169 static inline int
 170 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 171 {
 172         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 173 }
 174
 175 /*-------------------------------------------------------------------------*/
 176
 177 /* identification */
 178 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 179 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 180 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 181
 182 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 183 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 184
 185 /* operational registers */
 186 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 187 #       define  MC1_SPEED               (1 << 0)
 188 #       define  MC1_SUSPEND             (1 << 1)
 189 #       define  MC1_DAT_SE0             (1 << 2)
 190 #       define  MC1_TRANSPARENT         (1 << 3)
 191 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 192 #       define  MC1_OE_INT_EN           (1 << 5)
 193 #       define  MC1_UART_EN             (1 << 6)
 194 #       define  MC1_MASK                0x7f
 195 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 196 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 197 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 198 #       define  MC2_BI_DI               (1 << 2)
 199 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 200 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 201 #       define  MC2_AUDIO_EN            (1 << 5)
 202 #       define  MC2_PSW_EN              (1 << 6)
 203 #       define  MC2_EN2V7               (1 << 7)
 204 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 205 #       define  OTG1_DP_PULLUP          (1 << 0)
 206 #       define  OTG1_DM_PULLUP          (1 << 1)
 207 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 208 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 209 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 210 #       define  OTG1_VBUS_DRV           (1 << 5)
 211 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 212 #       define  OTG1_VBUS_CHRG          (1 << 7)
 213 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 214 #       define  OTG_B_SESS_END          (1 << 6)
 215 #       define  OTG_B_SESS_VLD          (1 << 7)
 216
 217 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 218 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 219
 220 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 221 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 222
 223 /* same bitfields in all interrupt registers */
 224 #       define  INTR_VBUS_VLD           (1 << 0)
 225 #       define  INTR_SESS_VLD           (1 << 1)
 226 #       define  INTR_DP_HI              (1 << 2)
 227 #       define  INTR_ID_GND             (1 << 3)
 228 #       define  INTR_DM_HI              (1 << 4)
 229 #       define  INTR_ID_FLOAT           (1 << 5)
 230 #       define  INTR_BDIS_ACON          (1 << 6)
 231 #       define  INTR_CR_INT             (1 << 7)
 232
 233 /*-------------------------------------------------------------------------*/
 234
 235 static inline const char *state_name(struct isp1301 *isp)
 236 {
 237         return usb_otg_state_string(isp->phy.state);
 238 }
 239
 240 /*-------------------------------------------------------------------------*/
 241
 242 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 243  * not everything is guarded by board-specific checks, or even using
 244  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 245  *
 246  * ALSO:  this currently doesn't use ISP1301 low-power modes
 247  * while OTG is running.
 248  */
 249
 250 static void power_down(struct isp1301 *isp)
 251 {
 252         isp->phy.state = OTG_STATE_UNDEFINED;
 253
 254         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 255         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 256
 257         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 258         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 259 }
 260
 261 static void power_up(struct isp1301 *isp)
 262 {
 263         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 264         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 265
 266         /* do this only when cpu is driving transceiver,
 267          * so host won't see a low speed device...
 268          */
 269         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 270 }
 271
 272 #define NO_HOST_SUSPEND
 273
 274 static int host_suspend(struct isp1301 *isp)
 275 {
 276 #ifdef  NO_HOST_SUSPEND
 277         return 0;
 278 #else
 279         struct device   *dev;
 280
 281         if (!isp->phy.otg->host)
 282                 return -ENODEV;
 283
 284         /* Currently ASSUMES only the OTG port matters;
 285          * other ports could be active...
 286          */
 287         dev = isp->phy.otg->host->controller;
 288         return dev->driver->suspend(dev, 3, 0);
 289 #endif
 290 }
 291
 292 static int host_resume(struct isp1301 *isp)
 293 {
 294 #ifdef  NO_HOST_SUSPEND
 295         return 0;
 296 #else
 297         struct device   *dev;
 298
 299         if (!isp->phy.otg->host)
 300                 return -ENODEV;
 301
 302         dev = isp->phy.otg->host->controller;
 303         return dev->driver->resume(dev, 0);
 304 #endif
 305 }
 306
 307 static int gadget_suspend(struct isp1301 *isp)
 308 {
 309         isp->phy.otg->gadget->b_hnp_enable = 0;
 310         isp->phy.otg->gadget->a_hnp_support = 0;
 311         isp->phy.otg->gadget->a_alt_hnp_support = 0;
 312         return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
 313 }
 314
 315 /*-------------------------------------------------------------------------*/
 316
 317 #define TIMER_MINUTES   10
 318 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 319
 320 /* Almost all our I2C messaging comes from a work queue's task context.
 321  * NOTE: guaranteeing certain response times might mean we shouldn't
 322  * share keventd's work queue; a realtime task might be safest.
 323  */
 324 static void isp1301_defer_work(struct isp1301 *isp, int work)
 325 {
 326         int status;
 327
 328         if (isp && !test_and_set_bit(work, &isp->todo)) {
 329                 (void) get_device(&isp->client->dev);
 330                 status = schedule_work(&isp->work);
 331                 if (!status && !isp->working)
 332                         dev_vdbg(&isp->client->dev,
 333                                 "work item %d may be lost\n", work);
 334         }
 335 }
 336
 337 /* called from irq handlers */
 338 static void a_idle(struct isp1301 *isp, const char *tag)
 339 {
 340         u32 l;
 341
 342         if (isp->phy.state == OTG_STATE_A_IDLE)
 343                 return;
 344
 345         isp->phy.otg->default_a = 1;
 346         if (isp->phy.otg->host) {
 347                 isp->phy.otg->host->is_b_host = 0;
 348                 host_suspend(isp);
 349         }
 350         if (isp->phy.otg->gadget) {
 351                 isp->phy.otg->gadget->is_a_peripheral = 1;
 352                 gadget_suspend(isp);
 353         }
 354         isp->phy.state = OTG_STATE_A_IDLE;
 355         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 356         omap_writel(l, OTG_CTRL);
 357         isp->last_otg_ctrl = l;
 358         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 359 }
 360
 361 /* called from irq handlers */
 362 static void b_idle(struct isp1301 *isp, const char *tag)
 363 {
 364         u32 l;
 365
 366         if (isp->phy.state == OTG_STATE_B_IDLE)
 367                 return;
 368
 369         isp->phy.otg->default_a = 0;
 370         if (isp->phy.otg->host) {
 371                 isp->phy.otg->host->is_b_host = 1;
 372                 host_suspend(isp);
 373         }
 374         if (isp->phy.otg->gadget) {
 375                 isp->phy.otg->gadget->is_a_peripheral = 0;
 376                 gadget_suspend(isp);
 377         }
 378         isp->phy.state = OTG_STATE_B_IDLE;
 379         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 380         omap_writel(l, OTG_CTRL);
 381         isp->last_otg_ctrl = l;
 382         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 383 }
 384
 385 static void
 386 dump_regs(struct isp1301 *isp, const char *label)
 387 {
 388         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 389         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 390         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 391
 392         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 393                 omap_readl(OTG_CTRL), label, state_name(isp),
 394                 ctrl, status, src);
 395         /* mode control and irq enables don't change much */
 396 }
 397
 398 /*-------------------------------------------------------------------------*/
 399
 400 #ifdef  CONFIG_USB_OTG
 401
 402 /*
 403  * The OMAP OTG controller handles most of the OTG state transitions.
 404  *
 405  * We translate isp1301 outputs (mostly voltage comparator status) into
 406  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 407  * flags into isp1301 inputs ... and infer state transitions.
 408  */
 409
 410 #ifdef  VERBOSE
 411
 412 static void check_state(struct isp1301 *isp, const char *tag)
 413 {
 414         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 415         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 416         unsigned                extra = 0;
 417
 418         switch (fsm) {
 419
 420         /* default-b */
 421         case 0x0:
 422                 state = OTG_STATE_B_IDLE;
 423                 break;
 424         case 0x3:
 425         case 0x7:
 426                 extra = 1;
 427         case 0x1:
 428                 state = OTG_STATE_B_PERIPHERAL;
 429                 break;
 430         case 0x11:
 431                 state = OTG_STATE_B_SRP_INIT;
 432                 break;
 433
 434         /* extra dual-role default-b states */
 435         case 0x12:
 436         case 0x13:
 437         case 0x16:
 438                 extra = 1;
 439         case 0x17:
 440                 state = OTG_STATE_B_WAIT_ACON;
 441                 break;
 442         case 0x34:
 443                 state = OTG_STATE_B_HOST;
 444                 break;
 445
 446         /* default-a */
 447         case 0x36:
 448                 state = OTG_STATE_A_IDLE;
 449                 break;
 450         case 0x3c:
 451                 state = OTG_STATE_A_WAIT_VFALL;
 452                 break;
 453         case 0x7d:
 454                 state = OTG_STATE_A_VBUS_ERR;
 455                 break;
 456         case 0x9e:
 457         case 0x9f:
 458                 extra = 1;
 459         case 0x89:
 460                 state = OTG_STATE_A_PERIPHERAL;
 461                 break;
 462         case 0xb7:
 463                 state = OTG_STATE_A_WAIT_VRISE;
 464                 break;
 465         case 0xb8:
 466                 state = OTG_STATE_A_WAIT_BCON;
 467                 break;
 468         case 0xb9:
 469                 state = OTG_STATE_A_HOST;
 470                 break;
 471         case 0xba:
 472                 state = OTG_STATE_A_SUSPEND;
 473                 break;
 474         default:
 475                 break;
 476         }
 477         if (isp->phy.state == state && !extra)
 478                 return;
 479         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 480                 usb_otg_state_string(state), fsm, state_name(isp),
 481                 omap_readl(OTG_CTRL));
 482 }
 483
 484 #else
 485
 486 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 487
 488 #endif
 489
 490 /* outputs from ISP1301_INTERRUPT_SOURCE */
 491 static void update_otg1(struct isp1301 *isp, u8 int_src)
 492 {
 493         u32     otg_ctrl;
 494
 495         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 496         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 497         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 498
 499         if (int_src & INTR_SESS_VLD)
 500                 otg_ctrl |= OTG_ASESSVLD;
 501         else if (isp->phy.state == OTG_STATE_A_WAIT_VFALL) {
 502                 a_idle(isp, "vfall");
 503                 otg_ctrl &= ~OTG_CTRL_BITS;
 504         }
 505         if (int_src & INTR_VBUS_VLD)
 506                 otg_ctrl |= OTG_VBUSVLD;
 507         if (int_src & INTR_ID_GND) {            /* default-A */
 508                 if (isp->phy.state == OTG_STATE_B_IDLE
 509                                 || isp->phy.state
 510                                         == OTG_STATE_UNDEFINED) {
 511                         a_idle(isp, "init");
 512                         return;
 513                 }
 514         } else {                                /* default-B */
 515                 otg_ctrl |= OTG_ID;
 516                 if (isp->phy.state == OTG_STATE_A_IDLE
 517                         || isp->phy.state == OTG_STATE_UNDEFINED) {
 518                         b_idle(isp, "init");
 519                         return;
 520                 }
 521         }
 522         omap_writel(otg_ctrl, OTG_CTRL);
 523 }
 524
 525 /* outputs from ISP1301_OTG_STATUS */
 526 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 527 {
 528         u32     otg_ctrl;
 529
 530         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 531         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 532         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 533         if (otg_status & OTG_B_SESS_VLD)
 534                 otg_ctrl |= OTG_BSESSVLD;
 535         else if (otg_status & OTG_B_SESS_END)
 536                 otg_ctrl |= OTG_BSESSEND;
 537         omap_writel(otg_ctrl, OTG_CTRL);
 538 }
 539
 540 /* inputs going to ISP1301 */
 541 static void otg_update_isp(struct isp1301 *isp)
 542 {
 543         u32     otg_ctrl, otg_change;
 544         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 545
 546         otg_ctrl = omap_readl(OTG_CTRL);
 547         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 548         isp->last_otg_ctrl = otg_ctrl;
 549         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 550
 551         switch (isp->phy.state) {
 552         case OTG_STATE_B_IDLE:
 553         case OTG_STATE_B_PERIPHERAL:
 554         case OTG_STATE_B_SRP_INIT:
 555                 if (!(otg_ctrl & OTG_PULLUP)) {
 556                         // if (otg_ctrl & OTG_B_HNPEN) {
 557                         if (isp->phy.otg->gadget->b_hnp_enable) {
 558                                 isp->phy.state = OTG_STATE_B_WAIT_ACON;
 559                                 pr_debug("  --> b_wait_acon\n");
 560                         }
 561                         goto pulldown;
 562                 }
 563 pullup:
 564                 set |= OTG1_DP_PULLUP;
 565                 clr |= OTG1_DP_PULLDOWN;
 566                 break;
 567         case OTG_STATE_A_SUSPEND:
 568         case OTG_STATE_A_PERIPHERAL:
 569                 if (otg_ctrl & OTG_PULLUP)
 570                         goto pullup;
 571                 /* FALLTHROUGH */
 572         // case OTG_STATE_B_WAIT_ACON:
 573         default:
 574 pulldown:
 575                 set |= OTG1_DP_PULLDOWN;
 576                 clr |= OTG1_DP_PULLUP;
 577                 break;
 578         }
 579
 580 #       define toggle(OTG,ISP) do { \
 581                 if (otg_ctrl & OTG) set |= ISP; \
 582                 else clr |= ISP; \
 583                 } while (0)
 584
 585         if (!(isp->phy.otg->host))
 586                 otg_ctrl &= ~OTG_DRV_VBUS;
 587
 588         switch (isp->phy.state) {
 589         case OTG_STATE_A_SUSPEND:
 590                 if (otg_ctrl & OTG_DRV_VBUS) {
 591                         set |= OTG1_VBUS_DRV;
 592                         break;
 593                 }
 594                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 595                 notresponding(isp);
 596
 597                 /* FALLTHROUGH */
 598         case OTG_STATE_A_VBUS_ERR:
 599                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
 600                 pr_debug("  --> a_wait_vfall\n");
 601                 /* FALLTHROUGH */
 602         case OTG_STATE_A_WAIT_VFALL:
 603                 /* FIXME usbcore thinks port power is still on ... */
 604                 clr |= OTG1_VBUS_DRV;
 605                 break;
 606         case OTG_STATE_A_IDLE:
 607                 if (otg_ctrl & OTG_DRV_VBUS) {
 608                         isp->phy.state = OTG_STATE_A_WAIT_VRISE;
 609                         pr_debug("  --> a_wait_vrise\n");
 610                 }
 611                 /* FALLTHROUGH */
 612         default:
 613                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 614         }
 615
 616         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 617         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 618
 619 #       undef toggle
 620
 621         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 622         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 623
 624         /* HNP switch to host or peripheral; and SRP */
 625         if (otg_change & OTG_PULLUP) {
 626                 u32 l;
 627
 628                 switch (isp->phy.state) {
 629                 case OTG_STATE_B_IDLE:
 630                         if (clr & OTG1_DP_PULLUP)
 631                                 break;
 632                         isp->phy.state = OTG_STATE_B_PERIPHERAL;
 633                         pr_debug("  --> b_peripheral\n");
 634                         break;
 635                 case OTG_STATE_A_SUSPEND:
 636                         if (clr & OTG1_DP_PULLUP)
 637                                 break;
 638                         isp->phy.state = OTG_STATE_A_PERIPHERAL;
 639                         pr_debug("  --> a_peripheral\n");
 640                         break;
 641                 default:
 642                         break;
 643                 }
 644                 l = omap_readl(OTG_CTRL);
 645                 l |= OTG_PULLUP;
 646                 omap_writel(l, OTG_CTRL);
 647         }
 648
 649         check_state(isp, __func__);
 650         dump_regs(isp, "otg->isp1301");
 651 }
 652
 653 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 654 {
 655         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 656         u32             otg_ctrl;
 657         int             ret = IRQ_NONE;
 658         struct isp1301  *isp = _isp;
 659         struct usb_otg  *otg = isp->phy.otg;
 660
 661         /* update ISP1301 transceiver from OTG controller */
 662         if (otg_irq & OPRT_CHG) {
 663                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 664                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 665                 ret = IRQ_HANDLED;
 666
 667         /* SRP to become b_peripheral failed */
 668         } else if (otg_irq & B_SRP_TMROUT) {
 669                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 670                 notresponding(isp);
 671
 672                 /* gadget drivers that care should monitor all kinds of
 673                  * remote wakeup (SRP, normal) using their own timer
 674                  * to give "check cable and A-device" messages.
 675                  */
 676                 if (isp->phy.state == OTG_STATE_B_SRP_INIT)
 677                         b_idle(isp, "srp_timeout");
 678
 679                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 680                 ret = IRQ_HANDLED;
 681
 682         /* HNP to become b_host failed */
 683         } else if (otg_irq & B_HNP_FAIL) {
 684                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 685                                 state_name(isp), omap_readl(OTG_CTRL));
 686                 notresponding(isp);
 687
 688                 otg_ctrl = omap_readl(OTG_CTRL);
 689                 otg_ctrl |= OTG_BUSDROP;
 690                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 691                 omap_writel(otg_ctrl, OTG_CTRL);
 692
 693                 /* subset of b_peripheral()... */
 694                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
 695                 pr_debug("  --> b_peripheral\n");
 696
 697                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 698                 ret = IRQ_HANDLED;
 699
 700         /* detect SRP from B-device ... */
 701         } else if (otg_irq & A_SRP_DETECT) {
 702                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 703                                 state_name(isp), omap_readl(OTG_CTRL));
 704
 705                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 706                 switch (isp->phy.state) {
 707                 case OTG_STATE_A_IDLE:
 708                         if (!otg->host)
 709                                 break;
 710                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 711                         otg_ctrl = omap_readl(OTG_CTRL);
 712                         otg_ctrl |= OTG_A_BUSREQ;
 713                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 714                                         & ~OTG_XCEIV_INPUTS
 715                                         & OTG_CTRL_MASK;
 716                         omap_writel(otg_ctrl, OTG_CTRL);
 717                         break;
 718                 default:
 719                         break;
 720                 }
 721
 722                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 723                 ret = IRQ_HANDLED;
 724
 725         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 726          * we don't track them separately
 727          */
 728         } else if (otg_irq & A_REQ_TMROUT) {
 729                 otg_ctrl = omap_readl(OTG_CTRL);
 730                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 731                                 state_name(isp), otg_ctrl);
 732                 notresponding(isp);
 733
 734                 otg_ctrl |= OTG_BUSDROP;
 735                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 736                 omap_writel(otg_ctrl, OTG_CTRL);
 737                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
 738
 739                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 740                 ret = IRQ_HANDLED;
 741
 742         /* A-supplied voltage fell too low; overcurrent */
 743         } else if (otg_irq & A_VBUS_ERR) {
 744                 otg_ctrl = omap_readl(OTG_CTRL);
 745                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 746                         state_name(isp), otg_irq, otg_ctrl);
 747
 748                 otg_ctrl |= OTG_BUSDROP;
 749                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 750                 omap_writel(otg_ctrl, OTG_CTRL);
 751                 isp->phy.state = OTG_STATE_A_VBUS_ERR;
 752
 753                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 754                 ret = IRQ_HANDLED;
 755
 756         /* switch driver; the transceiver code activates it,
 757          * ungating the udc clock or resuming OHCI.
 758          */
 759         } else if (otg_irq & DRIVER_SWITCH) {
 760                 int     kick = 0;
 761
 762                 otg_ctrl = omap_readl(OTG_CTRL);
 763                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 764                                 state_name(isp),
 765                                 (otg_ctrl & OTG_DRIVER_SEL)
 766                                         ? "gadget" : "host",
 767                                 otg_ctrl);
 768                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 769
 770                 /* role is peripheral */
 771                 if (otg_ctrl & OTG_DRIVER_SEL) {
 772                         switch (isp->phy.state) {
 773                         case OTG_STATE_A_IDLE:
 774                                 b_idle(isp, __func__);
 775                                 break;
 776                         default:
 777                                 break;
 778                         }
 779                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 780
 781                 /* role is host */
 782                 } else {
 783                         if (!(otg_ctrl & OTG_ID)) {
 784                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 785                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 786                         }
 787
 788                         if (otg->host) {
 789                                 switch (isp->phy.state) {
 790                                 case OTG_STATE_B_WAIT_ACON:
 791                                         isp->phy.state = OTG_STATE_B_HOST;
 792                                         pr_debug("  --> b_host\n");
 793                                         kick = 1;
 794                                         break;
 795                                 case OTG_STATE_A_WAIT_BCON:
 796                                         isp->phy.state = OTG_STATE_A_HOST;
 797                                         pr_debug("  --> a_host\n");
 798                                         break;
 799                                 case OTG_STATE_A_PERIPHERAL:
 800                                         isp->phy.state = OTG_STATE_A_WAIT_BCON;
 801                                         pr_debug("  --> a_wait_bcon\n");
 802                                         break;
 803                                 default:
 804                                         break;
 805                                 }
 806                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 807                         }
 808                 }
 809
 810                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 811                 ret = IRQ_HANDLED;
 812
 813                 if (kick)
 814                         usb_bus_start_enum(otg->host, otg->host->otg_port);
 815         }
 816
 817         check_state(isp, __func__);
 818         return ret;
 819 }
 820
 821 static struct platform_device *otg_dev;
 822
 823 static int isp1301_otg_init(struct isp1301 *isp)
 824 {
 825         u32 l;
 826
 827         if (!otg_dev)
 828                 return -ENODEV;
 829
 830         dump_regs(isp, __func__);
 831         /* some of these values are board-specific... */
 832         l = omap_readl(OTG_SYSCON_2);
 833         l |= OTG_EN
 834                 /* for B-device: */
 835                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 836                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 837                 // | (3 << 24)          /* 2msec VBUS pulse */
 838                 /* for A-device: */
 839                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 840                 | SRP_DPW               /* detect 167+ns SRP pulses */
 841                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 842                 ;
 843         omap_writel(l, OTG_SYSCON_2);
 844
 845         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 846         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 847
 848         check_state(isp, __func__);
 849         pr_debug("otg: %s, %s %06x\n",
 850                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 851
 852         omap_writew(DRIVER_SWITCH | OPRT_CHG
 853                         | B_SRP_TMROUT | B_HNP_FAIL
 854                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 855
 856         l = omap_readl(OTG_SYSCON_2);
 857         l |= OTG_EN;
 858         omap_writel(l, OTG_SYSCON_2);
 859
 860         return 0;
 861 }
 862
 863 static int otg_probe(struct platform_device *dev)
 864 {
 865         // struct omap_usb_config *config = dev->platform_data;
 866
 867         otg_dev = dev;
 868         return 0;
 869 }
 870
 871 static int otg_remove(struct platform_device *dev)
 872 {
 873         otg_dev = NULL;
 874         return 0;
 875 }
 876
 877 static struct platform_driver omap_otg_driver = {
 878         .probe          = otg_probe,
 879         .remove         = otg_remove,
 880         .driver         = {
 881                 .owner  = THIS_MODULE,
 882                 .name   = "omap_otg",
 883         },
 884 };
 885
 886 static int otg_bind(struct isp1301 *isp)
 887 {
 888         int     status;
 889
 890         if (otg_dev)
 891                 return -EBUSY;
 892
 893         status = platform_driver_register(&omap_otg_driver);
 894         if (status < 0)
 895                 return status;
 896
 897         if (otg_dev)
 898                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 899                                 0, DRIVER_NAME, isp);
 900         else
 901                 status = -ENODEV;
 902
 903         if (status < 0)
 904                 platform_driver_unregister(&omap_otg_driver);
 905         return status;
 906 }
 907
 908 static void otg_unbind(struct isp1301 *isp)
 909 {
 910         if (!otg_dev)
 911                 return;
 912         free_irq(otg_dev->resource[1].start, isp);
 913 }
 914
 915 #else
 916
 917 /* OTG controller isn't clocked */
 918
 919 #endif  /* CONFIG_USB_OTG */
 920
 921 /*-------------------------------------------------------------------------*/
 922
 923 static void b_peripheral(struct isp1301 *isp)
 924 {
 925         u32 l;
 926
 927         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 928         omap_writel(l, OTG_CTRL);
 929
 930         usb_gadget_vbus_connect(isp->phy.otg->gadget);
 931
 932 #ifdef  CONFIG_USB_OTG
 933         enable_vbus_draw(isp, 8);
 934         otg_update_isp(isp);
 935 #else
 936         enable_vbus_draw(isp, 100);
 937         /* UDC driver just set OTG_BSESSVLD */
 938         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 939         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 940         isp->phy.state = OTG_STATE_B_PERIPHERAL;
 941         pr_debug("  --> b_peripheral\n");
 942         dump_regs(isp, "2periph");
 943 #endif
 944 }
 945
 946 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 947 {
 948         struct usb_otg          *otg = isp->phy.otg;
 949         u8                      isp_stat, isp_bstat;
 950         enum usb_otg_state      state = isp->phy.state;
 951
 952         if (stat & INTR_BDIS_ACON)
 953                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 954
 955         /* start certain state transitions right away */
 956         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 957         if (isp_stat & INTR_ID_GND) {
 958                 if (otg->default_a) {
 959                         switch (state) {
 960                         case OTG_STATE_B_IDLE:
 961                                 a_idle(isp, "idle");
 962                                 /* FALLTHROUGH */
 963                         case OTG_STATE_A_IDLE:
 964                                 enable_vbus_source(isp);
 965                                 /* FALLTHROUGH */
 966                         case OTG_STATE_A_WAIT_VRISE:
 967                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 968                                  * the HC will transition to A_HOST (or
 969                                  * A_SUSPEND!) without our noticing except
 970                                  * when HNP is used.
 971                                  */
 972                                 if (isp_stat & INTR_VBUS_VLD)
 973                                         isp->phy.state = OTG_STATE_A_HOST;
 974                                 break;
 975                         case OTG_STATE_A_WAIT_VFALL:
 976                                 if (!(isp_stat & INTR_SESS_VLD))
 977                                         a_idle(isp, "vfell");
 978                                 break;
 979                         default:
 980                                 if (!(isp_stat & INTR_VBUS_VLD))
 981                                         isp->phy.state = OTG_STATE_A_VBUS_ERR;
 982                                 break;
 983                         }
 984                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 985                 } else {
 986                         switch (state) {
 987                         case OTG_STATE_B_PERIPHERAL:
 988                         case OTG_STATE_B_HOST:
 989                         case OTG_STATE_B_WAIT_ACON:
 990                                 usb_gadget_vbus_disconnect(otg->gadget);
 991                                 break;
 992                         default:
 993                                 break;
 994                         }
 995                         if (state != OTG_STATE_A_IDLE)
 996                                 a_idle(isp, "id");
 997                         if (otg->host && state == OTG_STATE_A_IDLE)
 998                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 999                         isp_bstat = 0;
1000                 }
1001         } else {
1002                 u32 l;
1003
1004                 /* if user unplugged mini-A end of cable,
1005                  * don't bypass A_WAIT_VFALL.
1006                  */
1007                 if (otg->default_a) {
1008                         switch (state) {
1009                         default:
1010                                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
1011                                 break;
1012                         case OTG_STATE_A_WAIT_VFALL:
1013                                 state = OTG_STATE_A_IDLE;
1014                                 /* khubd may take a while to notice and
1015                                  * handle this disconnect, so don't go
1016                                  * to B_IDLE quite yet.
1017                                  */
1018                                 break;
1019                         case OTG_STATE_A_IDLE:
1020                                 host_suspend(isp);
1021                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1022                                                 MC1_BDIS_ACON_EN);
1023                                 isp->phy.state = OTG_STATE_B_IDLE;
1024                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1025                                 l &= ~OTG_CTRL_BITS;
1026                                 omap_writel(l, OTG_CTRL);
1027                                 break;
1028                         case OTG_STATE_B_IDLE:
1029                                 break;
1030                         }
1031                 }
1032                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1033
1034                 switch (isp->phy.state) {
1035                 case OTG_STATE_B_PERIPHERAL:
1036                 case OTG_STATE_B_WAIT_ACON:
1037                 case OTG_STATE_B_HOST:
1038                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1039                                 break;
1040                         enable_vbus_draw(isp, 0);
1041 #ifndef CONFIG_USB_OTG
1042                         /* UDC driver will clear OTG_BSESSVLD */
1043                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1044                                                 OTG1_DP_PULLDOWN);
1045                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1046                                                 OTG1_DP_PULLUP);
1047                         dump_regs(isp, __func__);
1048 #endif
1049                         /* FALLTHROUGH */
1050                 case OTG_STATE_B_SRP_INIT:
1051                         b_idle(isp, __func__);
1052                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1053                         omap_writel(l, OTG_CTRL);
1054                         /* FALLTHROUGH */
1055                 case OTG_STATE_B_IDLE:
1056                         if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1057 #ifdef  CONFIG_USB_OTG
1058                                 update_otg1(isp, isp_stat);
1059                                 update_otg2(isp, isp_bstat);
1060 #endif
1061                                 b_peripheral(isp);
1062                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1063                                 isp_bstat |= OTG_B_SESS_END;
1064                         break;
1065                 case OTG_STATE_A_WAIT_VFALL:
1066                         break;
1067                 default:
1068                         pr_debug("otg: unsupported b-device %s\n",
1069                                 state_name(isp));
1070                         break;
1071                 }
1072         }
1073
1074         if (state != isp->phy.state)
1075                 pr_debug("  isp, %s -> %s\n",
1076                                 usb_otg_state_string(state), state_name(isp));
1077
1078 #ifdef  CONFIG_USB_OTG
1079         /* update the OTG controller state to match the isp1301; may
1080          * trigger OPRT_CHG irqs for changes going to the isp1301.
1081          */
1082         update_otg1(isp, isp_stat);
1083         update_otg2(isp, isp_bstat);
1084         check_state(isp, __func__);
1085 #endif
1086
1087         dump_regs(isp, "isp1301->otg");
1088 }
1089
1090 /*-------------------------------------------------------------------------*/
1091
1092 static u8 isp1301_clear_latch(struct isp1301 *isp)
1093 {
1094         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1095         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1096         return latch;
1097 }
1098
1099 static void
1100 isp1301_work(struct work_struct *work)
1101 {
1102         struct isp1301  *isp = container_of(work, struct isp1301, work);
1103         int             stop;
1104
1105         /* implicit lock:  we're the only task using this device */
1106         isp->working = 1;
1107         do {
1108                 stop = test_bit(WORK_STOP, &isp->todo);
1109
1110 #ifdef  CONFIG_USB_OTG
1111                 /* transfer state from otg engine to isp1301 */
1112                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1113                         otg_update_isp(isp);
1114                         put_device(&isp->client->dev);
1115                 }
1116 #endif
1117                 /* transfer state from isp1301 to otg engine */
1118                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1119                         u8              stat = isp1301_clear_latch(isp);
1120
1121                         isp_update_otg(isp, stat);
1122                         put_device(&isp->client->dev);
1123                 }
1124
1125                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1126                         u32     otg_ctrl;
1127
1128                         /*
1129                          * skip A_WAIT_VRISE; hc transitions invisibly
1130                          * skip A_WAIT_BCON; same.
1131                          */
1132                         switch (isp->phy.state) {
1133                         case OTG_STATE_A_WAIT_BCON:
1134                         case OTG_STATE_A_WAIT_VRISE:
1135                                 isp->phy.state = OTG_STATE_A_HOST;
1136                                 pr_debug("  --> a_host\n");
1137                                 otg_ctrl = omap_readl(OTG_CTRL);
1138                                 otg_ctrl |= OTG_A_BUSREQ;
1139                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1140                                                 & OTG_CTRL_MASK;
1141                                 omap_writel(otg_ctrl, OTG_CTRL);
1142                                 break;
1143                         case OTG_STATE_B_WAIT_ACON:
1144                                 isp->phy.state = OTG_STATE_B_HOST;
1145                                 pr_debug("  --> b_host (acon)\n");
1146                                 break;
1147                         case OTG_STATE_B_HOST:
1148                         case OTG_STATE_B_IDLE:
1149                         case OTG_STATE_A_IDLE:
1150                                 break;
1151                         default:
1152                                 pr_debug("  host resume in %s\n",
1153                                                 state_name(isp));
1154                         }
1155                         host_resume(isp);
1156                         // mdelay(10);
1157                         put_device(&isp->client->dev);
1158                 }
1159
1160                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1161 #ifdef  VERBOSE
1162                         dump_regs(isp, "timer");
1163                         if (!stop)
1164                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1165 #endif
1166                         put_device(&isp->client->dev);
1167                 }
1168
1169                 if (isp->todo)
1170                         dev_vdbg(&isp->client->dev,
1171                                 "work done, todo = 0x%lx\n",
1172                                 isp->todo);
1173                 if (stop) {
1174                         dev_dbg(&isp->client->dev, "stop\n");
1175                         break;
1176                 }
1177         } while (isp->todo);
1178         isp->working = 0;
1179 }
1180
1181 static irqreturn_t isp1301_irq(int irq, void *isp)
1182 {
1183         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1184         return IRQ_HANDLED;
1185 }
1186
1187 static void isp1301_timer(unsigned long _isp)
1188 {
1189         isp1301_defer_work((void *)_isp, WORK_TIMER);
1190 }
1191
1192 /*-------------------------------------------------------------------------*/
1193
1194 static void isp1301_release(struct device *dev)
1195 {
1196         struct isp1301  *isp;
1197
1198         isp = dev_get_drvdata(dev);
1199
1200         /* FIXME -- not with a "new style" driver, it doesn't!! */
1201
1202         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1203         if (isp->i2c_release)
1204                 isp->i2c_release(dev);
1205         kfree(isp->phy.otg);
1206         kfree (isp);
1207 }
1208
1209 static struct isp1301 *the_transceiver;
1210
1211 static int isp1301_remove(struct i2c_client *i2c)
1212 {
1213         struct isp1301  *isp;
1214
1215         isp = i2c_get_clientdata(i2c);
1216
1217         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1218         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1219         free_irq(i2c->irq, isp);
1220 #ifdef  CONFIG_USB_OTG
1221         otg_unbind(isp);
1222 #endif
1223         if (machine_is_omap_h2())
1224                 gpio_free(2);
1225
1226         isp->timer.data = 0;
1227         set_bit(WORK_STOP, &isp->todo);
1228         del_timer_sync(&isp->timer);
1229         flush_work(&isp->work);
1230
1231         put_device(&i2c->dev);
1232         the_transceiver = NULL;
1233
1234         return 0;
1235 }
1236
1237 /*-------------------------------------------------------------------------*/
1238
1239 /* NOTE:  three modes are possible here, only one of which
1240  * will be standards-conformant on any given system:
1241  *
1242  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1243  *  - HOST mode, for when there's one or more A (host) connectors
1244  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1245  *
1246  * As a rule, you won't have an isp1301 chip unless it's there to
1247  * support the OTG mode.  Other modes help testing USB controllers
1248  * in isolation from (full) OTG support, or maybe so later board
1249  * revisions can help to support those feature.
1250  */
1251
1252 #ifdef  CONFIG_USB_OTG
1253
1254 static int isp1301_otg_enable(struct isp1301 *isp)
1255 {
1256         power_up(isp);
1257         isp1301_otg_init(isp);
1258
1259         /* NOTE:  since we don't change this, this provides
1260          * a few more interrupts than are strictly needed.
1261          */
1262         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1263                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1264         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1265                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1266
1267         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1268
1269         return 0;
1270 }
1271
1272 #endif
1273
1274 /* add or disable the host device+driver */
1275 static int
1276 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1277 {
1278         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1279
1280         if (isp != the_transceiver)
1281                 return -ENODEV;
1282
1283         if (!host) {
1284                 omap_writew(0, OTG_IRQ_EN);
1285                 power_down(isp);
1286                 otg->host = NULL;
1287                 return 0;
1288         }
1289
1290 #ifdef  CONFIG_USB_OTG
1291         otg->host = host;
1292         dev_dbg(&isp->client->dev, "registered host\n");
1293         host_suspend(isp);
1294         if (otg->gadget)
1295                 return isp1301_otg_enable(isp);
1296         return 0;
1297
1298 #elif !IS_ENABLED(CONFIG_USB_OMAP)
1299         // FIXME update its refcount
1300         otg->host = host;
1301
1302         power_up(isp);
1303
1304         if (machine_is_omap_h2())
1305                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1306
1307         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1308         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1309                 INTR_ID_GND);
1310         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1311                 INTR_ID_GND);
1312
1313         /* If this has a Mini-AB connector, this mode is highly
1314          * nonstandard ... but can be handy for testing, especially with
1315          * the Mini-A end of an OTG cable.  (Or something nonstandard
1316          * like MiniB-to-StandardB, maybe built with a gender mender.)
1317          */
1318         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1319
1320         dump_regs(isp, __func__);
1321
1322         return 0;
1323
1324 #else
1325         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1326         return -EINVAL;
1327 #endif
1328
1329 }
1330
1331 static int
1332 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1333 {
1334         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1335
1336         if (isp != the_transceiver)
1337                 return -ENODEV;
1338
1339         if (!gadget) {
1340                 omap_writew(0, OTG_IRQ_EN);
1341                 if (!otg->default_a)
1342                         enable_vbus_draw(isp, 0);
1343                 usb_gadget_vbus_disconnect(otg->gadget);
1344                 otg->gadget = NULL;
1345                 power_down(isp);
1346                 return 0;
1347         }
1348
1349 #ifdef  CONFIG_USB_OTG
1350         otg->gadget = gadget;
1351         dev_dbg(&isp->client->dev, "registered gadget\n");
1352         /* gadget driver may be suspended until vbus_connect () */
1353         if (otg->host)
1354                 return isp1301_otg_enable(isp);
1355         return 0;
1356
1357 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1358         otg->gadget = gadget;
1359         // FIXME update its refcount
1360
1361         {
1362                 u32 l;
1363
1364                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1365                 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1366                 l |= OTG_ID;
1367                 omap_writel(l, OTG_CTRL);
1368         }
1369
1370         power_up(isp);
1371         isp->phy.state = OTG_STATE_B_IDLE;
1372
1373         if (machine_is_omap_h2() || machine_is_omap_h3())
1374                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1375
1376         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1377                 INTR_SESS_VLD);
1378         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1379                 INTR_VBUS_VLD);
1380         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1381         dump_regs(isp, __func__);
1382
1383         /* If this has a Mini-AB connector, this mode is highly
1384          * nonstandard ... but can be handy for testing, so long
1385          * as you don't plug a Mini-A cable into the jack.
1386          */
1387         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1388                 b_peripheral(isp);
1389
1390         return 0;
1391
1392 #else
1393         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1394         return -EINVAL;
1395 #endif
1396 }
1397
1398
1399 /*-------------------------------------------------------------------------*/
1400
1401 static int
1402 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1403 {
1404         if (!the_transceiver)
1405                 return -ENODEV;
1406         if (dev->state == OTG_STATE_B_PERIPHERAL)
1407                 enable_vbus_draw(the_transceiver, mA);
1408         return 0;
1409 }
1410
1411 static int
1412 isp1301_start_srp(struct usb_otg *otg)
1413 {
1414         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1415         u32             otg_ctrl;
1416
1417         if (isp != the_transceiver || isp->phy.state != OTG_STATE_B_IDLE)
1418                 return -ENODEV;
1419
1420         otg_ctrl = omap_readl(OTG_CTRL);
1421         if (!(otg_ctrl & OTG_BSESSEND))
1422                 return -EINVAL;
1423
1424         otg_ctrl |= OTG_B_BUSREQ;
1425         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1426         omap_writel(otg_ctrl, OTG_CTRL);
1427         isp->phy.state = OTG_STATE_B_SRP_INIT;
1428
1429         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1430                         omap_readl(OTG_CTRL));
1431 #ifdef  CONFIG_USB_OTG
1432         check_state(isp, __func__);
1433 #endif
1434         return 0;
1435 }
1436
1437 static int
1438 isp1301_start_hnp(struct usb_otg *otg)
1439 {
1440 #ifdef  CONFIG_USB_OTG
1441         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1442         u32 l;
1443
1444         if (isp != the_transceiver)
1445                 return -ENODEV;
1446         if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1447                 return -ENOTCONN;
1448         if (!otg->default_a && (otg->gadget == NULL
1449                         || !otg->gadget->b_hnp_enable))
1450                 return -ENOTCONN;
1451
1452         /* We want hardware to manage most HNP protocol timings.
1453          * So do this part as early as possible...
1454          */
1455         switch (isp->phy.state) {
1456         case OTG_STATE_B_HOST:
1457                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
1458                 /* caller will suspend next */
1459                 break;
1460         case OTG_STATE_A_HOST:
1461 #if 0
1462                 /* autoconnect mode avoids irq latency bugs */
1463                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1464                                 MC1_BDIS_ACON_EN);
1465 #endif
1466                 /* caller must suspend then clear A_BUSREQ */
1467                 usb_gadget_vbus_connect(otg->gadget);
1468                 l = omap_readl(OTG_CTRL);
1469                 l |= OTG_A_SETB_HNPEN;
1470                 omap_writel(l, OTG_CTRL);
1471
1472                 break;
1473         case OTG_STATE_A_PERIPHERAL:
1474                 /* initiated by B-Host suspend */
1475                 break;
1476         default:
1477                 return -EILSEQ;
1478         }
1479         pr_debug("otg: HNP %s, %06x ...\n",
1480                 state_name(isp), omap_readl(OTG_CTRL));
1481         check_state(isp, __func__);
1482         return 0;
1483 #else
1484         /* srp-only */
1485         return -EINVAL;
1486 #endif
1487 }
1488
1489 /*-------------------------------------------------------------------------*/
1490
1491 static int
1492 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1493 {
1494         int                     status;
1495         struct isp1301          *isp;
1496
1497         if (the_transceiver)
1498                 return 0;
1499
1500         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1501         if (!isp)
1502                 return 0;
1503
1504         isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1505         if (!isp->phy.otg) {
1506                 kfree(isp);
1507                 return 0;
1508         }
1509
1510         INIT_WORK(&isp->work, isp1301_work);
1511         init_timer(&isp->timer);
1512         isp->timer.function = isp1301_timer;
1513         isp->timer.data = (unsigned long) isp;
1514
1515         i2c_set_clientdata(i2c, isp);
1516         isp->client = i2c;
1517
1518         /* verify the chip (shouldn't be necessary) */
1519         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1520         if (status != I2C_VENDOR_ID_PHILIPS) {
1521                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1522                 goto fail;
1523         }
1524         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1525         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1526                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1527                 goto fail;
1528         }
1529         isp->i2c_release = i2c->dev.release;
1530         i2c->dev.release = isp1301_release;
1531
1532         /* initial development used chiprev 2.00 */
1533         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1534         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1535                 status >> 8, status & 0xff);
1536
1537         /* make like power-on reset */
1538         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1539
1540         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1541         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1542
1543         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1544                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1545         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1546                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1547
1548         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1549         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1550         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1551
1552 #ifdef  CONFIG_USB_OTG
1553         status = otg_bind(isp);
1554         if (status < 0) {
1555                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1556                 goto fail;
1557         }
1558 #endif
1559
1560         if (machine_is_omap_h2()) {
1561                 /* full speed signaling by default */
1562                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1563                         MC1_SPEED);
1564                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1565                         MC2_SPD_SUSP_CTRL);
1566
1567                 /* IRQ wired at M14 */
1568                 omap_cfg_reg(M14_1510_GPIO2);
1569                 if (gpio_request(2, "isp1301") == 0)
1570                         gpio_direction_input(2);
1571                 isp->irq_type = IRQF_TRIGGER_FALLING;
1572         }
1573
1574         status = request_irq(i2c->irq, isp1301_irq,
1575                         isp->irq_type, DRIVER_NAME, isp);
1576         if (status < 0) {
1577                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1578                                 i2c->irq, status);
1579                 goto fail;
1580         }
1581
1582         isp->phy.dev = &i2c->dev;
1583         isp->phy.label = DRIVER_NAME;
1584         isp->phy.set_power = isp1301_set_power,
1585
1586         isp->phy.otg->phy = &isp->phy;
1587         isp->phy.otg->set_host = isp1301_set_host,
1588         isp->phy.otg->set_peripheral = isp1301_set_peripheral,
1589         isp->phy.otg->start_srp = isp1301_start_srp,
1590         isp->phy.otg->start_hnp = isp1301_start_hnp,
1591
1592         enable_vbus_draw(isp, 0);
1593         power_down(isp);
1594         the_transceiver = isp;
1595
1596 #ifdef  CONFIG_USB_OTG
1597         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1598         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1599 #endif
1600
1601         dump_regs(isp, __func__);
1602
1603 #ifdef  VERBOSE
1604         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1605         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1606 #endif
1607
1608         status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1609         if (status < 0)
1610                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1611                         status);
1612
1613         return 0;
1614
1615 fail:
1616         kfree(isp->phy.otg);
1617         kfree(isp);
1618         return -ENODEV;
1619 }
1620
1621 static const struct i2c_device_id isp1301_id[] = {
1622         { "isp1301_omap", 0 },
1623         { }
1624 };
1625 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1626
1627 static struct i2c_driver isp1301_driver = {
1628         .driver = {
1629                 .name   = "isp1301_omap",
1630         },
1631         .probe          = isp1301_probe,
1632         .remove         = isp1301_remove,
1633         .id_table       = isp1301_id,
1634 };
1635
1636 /*-------------------------------------------------------------------------*/
1637
1638 static int __init isp_init(void)
1639 {
1640         return i2c_add_driver(&isp1301_driver);
1641 }
1642 subsys_initcall(isp_init);
1643
1644 static void __exit isp_exit(void)
1645 {
1646         if (the_transceiver)
1647                 usb_remove_phy(&the_transceiver->phy);
1648         i2c_del_driver(&isp1301_driver);
1649 }
1650 module_exit(isp_exit);
1651