drivers/usb/phy/phy-isp1301-omap.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
   4  *
   5  * Copyright (C) 2004 Texas Instruments
   6  * Copyright (C) 2004 David Brownell
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/gpio.h>
  16 #include <linux/usb/ch9.h>
  17 #include <linux/usb/gadget.h>
  18 #include <linux/usb.h>
  19 #include <linux/usb/otg.h>
  20 #include <linux/i2c.h>
  21 #include <linux/workqueue.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/mach-types.h>
  25
  26 #include <mach/mux.h>
  27
  28 #include <mach/usb.h>
  29
  30 #undef VERBOSE
  31
  32
  33 #define DRIVER_VERSION  "24 August 2004"
  34 #define DRIVER_NAME     (isp1301_driver.driver.name)
  35
  36 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  37 MODULE_LICENSE("GPL");
  38
  39 struct isp1301 {
  40         struct usb_phy          phy;
  41         struct i2c_client       *client;
  42         void                    (*i2c_release)(struct device *dev);
  43
  44         int                     irq_type;
  45
  46         u32                     last_otg_ctrl;
  47         unsigned                working:1;
  48
  49         struct timer_list       timer;
  50
  51         /* use keventd context to change the state for us */
  52         struct work_struct      work;
  53
  54         unsigned long           todo;
  55 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
  56 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
  57 #               define WORK_HOST_RESUME 4       /* resume host */
  58 #               define WORK_TIMER       6       /* timer fired */
  59 #               define WORK_STOP        7       /* don't resubmit */
  60 };
  61
  62
  63 /* bits in OTG_CTRL */
  64
  65 #define OTG_XCEIV_OUTPUTS \
  66         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
  67 #define OTG_XCEIV_INPUTS \
  68         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
  69 #define OTG_CTRL_BITS \
  70         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
  71         /* and OTG_PULLUP is sometimes written */
  72
  73 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
  74         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
  75         OTG_CTRL_BITS)
  76
  77
  78 /*-------------------------------------------------------------------------*/
  79
  80 /* board-specific PM hooks */
  81
  82 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
  83
  84 #if IS_REACHABLE(CONFIG_TPS65010)
  85
  86 #include <linux/mfd/tps65010.h>
  87
  88 #else
  89
  90 static inline int tps65010_set_vbus_draw(unsigned mA)
  91 {
  92         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
  93         return 0;
  94 }
  95
  96 #endif
  97
  98 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
  99 {
 100         int status = tps65010_set_vbus_draw(mA);
 101         if (status < 0)
 102                 pr_debug("  VBUS %d mA error %d\n", mA, status);
 103 }
 104
 105 #else
 106
 107 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
 108 {
 109         /* H4 controls this by DIP switch S2.4; no soft control.
 110          * ON means the charger is always enabled.  Leave it OFF
 111          * unless the OTG port is used only in B-peripheral mode.
 112          */
 113 }
 114
 115 #endif
 116
 117 static void enable_vbus_source(struct isp1301 *isp)
 118 {
 119         /* this board won't supply more than 8mA vbus power.
 120          * some boards can switch a 100ma "unit load" (or more).
 121          */
 122 }
 123
 124
 125 /* products will deliver OTG messages with LEDs, GUI, etc */
 126 static inline void notresponding(struct isp1301 *isp)
 127 {
 128         printk(KERN_NOTICE "OTG device not responding.\n");
 129 }
 130
 131
 132 /*-------------------------------------------------------------------------*/
 133
 134 static struct i2c_driver isp1301_driver;
 135
 136 /* smbus apis are used for portability */
 137
 138 static inline u8
 139 isp1301_get_u8(struct isp1301 *isp, u8 reg)
 140 {
 141         return i2c_smbus_read_byte_data(isp->client, reg + 0);
 142 }
 143
 144 static inline int
 145 isp1301_get_u16(struct isp1301 *isp, u8 reg)
 146 {
 147         return i2c_smbus_read_word_data(isp->client, reg);
 148 }
 149
 150 static inline int
 151 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 152 {
 153         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 154 }
 155
 156 static inline int
 157 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 158 {
 159         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
 160 }
 161
 162 /*-------------------------------------------------------------------------*/
 163
 164 /* identification */
 165 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
 166 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
 167 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
 168
 169 #define I2C_VENDOR_ID_PHILIPS           0x04cc
 170 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
 171
 172 /* operational registers */
 173 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
 174 #       define  MC1_SPEED               (1 << 0)
 175 #       define  MC1_SUSPEND             (1 << 1)
 176 #       define  MC1_DAT_SE0             (1 << 2)
 177 #       define  MC1_TRANSPARENT         (1 << 3)
 178 #       define  MC1_BDIS_ACON_EN        (1 << 4)
 179 #       define  MC1_OE_INT_EN           (1 << 5)
 180 #       define  MC1_UART_EN             (1 << 6)
 181 #       define  MC1_MASK                0x7f
 182 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
 183 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
 184 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
 185 #       define  MC2_BI_DI               (1 << 2)
 186 #       define  MC2_TRANSP_BDIR0        (1 << 3)
 187 #       define  MC2_TRANSP_BDIR1        (1 << 4)
 188 #       define  MC2_AUDIO_EN            (1 << 5)
 189 #       define  MC2_PSW_EN              (1 << 6)
 190 #       define  MC2_EN2V7               (1 << 7)
 191 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
 192 #       define  OTG1_DP_PULLUP          (1 << 0)
 193 #       define  OTG1_DM_PULLUP          (1 << 1)
 194 #       define  OTG1_DP_PULLDOWN        (1 << 2)
 195 #       define  OTG1_DM_PULLDOWN        (1 << 3)
 196 #       define  OTG1_ID_PULLDOWN        (1 << 4)
 197 #       define  OTG1_VBUS_DRV           (1 << 5)
 198 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
 199 #       define  OTG1_VBUS_CHRG          (1 << 7)
 200 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
 201 #       define  OTG_B_SESS_END          (1 << 6)
 202 #       define  OTG_B_SESS_VLD          (1 << 7)
 203
 204 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
 205 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
 206
 207 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
 208 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
 209
 210 /* same bitfields in all interrupt registers */
 211 #       define  INTR_VBUS_VLD           (1 << 0)
 212 #       define  INTR_SESS_VLD           (1 << 1)
 213 #       define  INTR_DP_HI              (1 << 2)
 214 #       define  INTR_ID_GND             (1 << 3)
 215 #       define  INTR_DM_HI              (1 << 4)
 216 #       define  INTR_ID_FLOAT           (1 << 5)
 217 #       define  INTR_BDIS_ACON          (1 << 6)
 218 #       define  INTR_CR_INT             (1 << 7)
 219
 220 /*-------------------------------------------------------------------------*/
 221
 222 static inline const char *state_name(struct isp1301 *isp)
 223 {
 224         return usb_otg_state_string(isp->phy.otg->state);
 225 }
 226
 227 /*-------------------------------------------------------------------------*/
 228
 229 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
 230  * not everything is guarded by board-specific checks, or even using
 231  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
 232  *
 233  * ALSO:  this currently doesn't use ISP1301 low-power modes
 234  * while OTG is running.
 235  */
 236
 237 static void power_down(struct isp1301 *isp)
 238 {
 239         isp->phy.otg->state = OTG_STATE_UNDEFINED;
 240
 241         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 242         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 243
 244         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 245         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 246 }
 247
 248 static void __maybe_unused power_up(struct isp1301 *isp)
 249 {
 250         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
 251         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 252
 253         /* do this only when cpu is driving transceiver,
 254          * so host won't see a low speed device...
 255          */
 256         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
 257 }
 258
 259 #define NO_HOST_SUSPEND
 260
 261 static int host_suspend(struct isp1301 *isp)
 262 {
 263 #ifdef  NO_HOST_SUSPEND
 264         return 0;
 265 #else
 266         struct device   *dev;
 267
 268         if (!isp->phy.otg->host)
 269                 return -ENODEV;
 270
 271         /* Currently ASSUMES only the OTG port matters;
 272          * other ports could be active...
 273          */
 274         dev = isp->phy.otg->host->controller;
 275         return dev->driver->suspend(dev, 3, 0);
 276 #endif
 277 }
 278
 279 static int host_resume(struct isp1301 *isp)
 280 {
 281 #ifdef  NO_HOST_SUSPEND
 282         return 0;
 283 #else
 284         struct device   *dev;
 285
 286         if (!isp->phy.otg->host)
 287                 return -ENODEV;
 288
 289         dev = isp->phy.otg->host->controller;
 290         return dev->driver->resume(dev, 0);
 291 #endif
 292 }
 293
 294 static int gadget_suspend(struct isp1301 *isp)
 295 {
 296         isp->phy.otg->gadget->b_hnp_enable = 0;
 297         isp->phy.otg->gadget->a_hnp_support = 0;
 298         isp->phy.otg->gadget->a_alt_hnp_support = 0;
 299         return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
 300 }
 301
 302 /*-------------------------------------------------------------------------*/
 303
 304 #define TIMER_MINUTES   10
 305 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
 306
 307 /* Almost all our I2C messaging comes from a work queue's task context.
 308  * NOTE: guaranteeing certain response times might mean we shouldn't
 309  * share keventd's work queue; a realtime task might be safest.
 310  */
 311 static void isp1301_defer_work(struct isp1301 *isp, int work)
 312 {
 313         int status;
 314
 315         if (isp && !test_and_set_bit(work, &isp->todo)) {
 316                 (void) get_device(&isp->client->dev);
 317                 status = schedule_work(&isp->work);
 318                 if (!status && !isp->working)
 319                         dev_vdbg(&isp->client->dev,
 320                                 "work item %d may be lost\n", work);
 321         }
 322 }
 323
 324 /* called from irq handlers */
 325 static void a_idle(struct isp1301 *isp, const char *tag)
 326 {
 327         u32 l;
 328
 329         if (isp->phy.otg->state == OTG_STATE_A_IDLE)
 330                 return;
 331
 332         isp->phy.otg->default_a = 1;
 333         if (isp->phy.otg->host) {
 334                 isp->phy.otg->host->is_b_host = 0;
 335                 host_suspend(isp);
 336         }
 337         if (isp->phy.otg->gadget) {
 338                 isp->phy.otg->gadget->is_a_peripheral = 1;
 339                 gadget_suspend(isp);
 340         }
 341         isp->phy.otg->state = OTG_STATE_A_IDLE;
 342         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 343         omap_writel(l, OTG_CTRL);
 344         isp->last_otg_ctrl = l;
 345         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 346 }
 347
 348 /* called from irq handlers */
 349 static void b_idle(struct isp1301 *isp, const char *tag)
 350 {
 351         u32 l;
 352
 353         if (isp->phy.otg->state == OTG_STATE_B_IDLE)
 354                 return;
 355
 356         isp->phy.otg->default_a = 0;
 357         if (isp->phy.otg->host) {
 358                 isp->phy.otg->host->is_b_host = 1;
 359                 host_suspend(isp);
 360         }
 361         if (isp->phy.otg->gadget) {
 362                 isp->phy.otg->gadget->is_a_peripheral = 0;
 363                 gadget_suspend(isp);
 364         }
 365         isp->phy.otg->state = OTG_STATE_B_IDLE;
 366         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 367         omap_writel(l, OTG_CTRL);
 368         isp->last_otg_ctrl = l;
 369         pr_debug("  --> %s/%s\n", state_name(isp), tag);
 370 }
 371
 372 static void
 373 dump_regs(struct isp1301 *isp, const char *label)
 374 {
 375         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
 376         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 377         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 378
 379         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
 380                 omap_readl(OTG_CTRL), label, state_name(isp),
 381                 ctrl, status, src);
 382         /* mode control and irq enables don't change much */
 383 }
 384
 385 /*-------------------------------------------------------------------------*/
 386
 387 #ifdef  CONFIG_USB_OTG
 388
 389 /*
 390  * The OMAP OTG controller handles most of the OTG state transitions.
 391  *
 392  * We translate isp1301 outputs (mostly voltage comparator status) into
 393  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
 394  * flags into isp1301 inputs ... and infer state transitions.
 395  */
 396
 397 #ifdef  VERBOSE
 398
 399 static void check_state(struct isp1301 *isp, const char *tag)
 400 {
 401         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
 402         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
 403         unsigned                extra = 0;
 404
 405         switch (fsm) {
 406
 407         /* default-b */
 408         case 0x0:
 409                 state = OTG_STATE_B_IDLE;
 410                 break;
 411         case 0x3:
 412         case 0x7:
 413                 extra = 1;
 414         case 0x1:
 415                 state = OTG_STATE_B_PERIPHERAL;
 416                 break;
 417         case 0x11:
 418                 state = OTG_STATE_B_SRP_INIT;
 419                 break;
 420
 421         /* extra dual-role default-b states */
 422         case 0x12:
 423         case 0x13:
 424         case 0x16:
 425                 extra = 1;
 426         case 0x17:
 427                 state = OTG_STATE_B_WAIT_ACON;
 428                 break;
 429         case 0x34:
 430                 state = OTG_STATE_B_HOST;
 431                 break;
 432
 433         /* default-a */
 434         case 0x36:
 435                 state = OTG_STATE_A_IDLE;
 436                 break;
 437         case 0x3c:
 438                 state = OTG_STATE_A_WAIT_VFALL;
 439                 break;
 440         case 0x7d:
 441                 state = OTG_STATE_A_VBUS_ERR;
 442                 break;
 443         case 0x9e:
 444         case 0x9f:
 445                 extra = 1;
 446         case 0x89:
 447                 state = OTG_STATE_A_PERIPHERAL;
 448                 break;
 449         case 0xb7:
 450                 state = OTG_STATE_A_WAIT_VRISE;
 451                 break;
 452         case 0xb8:
 453                 state = OTG_STATE_A_WAIT_BCON;
 454                 break;
 455         case 0xb9:
 456                 state = OTG_STATE_A_HOST;
 457                 break;
 458         case 0xba:
 459                 state = OTG_STATE_A_SUSPEND;
 460                 break;
 461         default:
 462                 break;
 463         }
 464         if (isp->phy.otg->state == state && !extra)
 465                 return;
 466         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
 467                 usb_otg_state_string(state), fsm, state_name(isp),
 468                 omap_readl(OTG_CTRL));
 469 }
 470
 471 #else
 472
 473 static inline void check_state(struct isp1301 *isp, const char *tag) { }
 474
 475 #endif
 476
 477 /* outputs from ISP1301_INTERRUPT_SOURCE */
 478 static void update_otg1(struct isp1301 *isp, u8 int_src)
 479 {
 480         u32     otg_ctrl;
 481
 482         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 483         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 484         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
 485
 486         if (int_src & INTR_SESS_VLD)
 487                 otg_ctrl |= OTG_ASESSVLD;
 488         else if (isp->phy.otg->state == OTG_STATE_A_WAIT_VFALL) {
 489                 a_idle(isp, "vfall");
 490                 otg_ctrl &= ~OTG_CTRL_BITS;
 491         }
 492         if (int_src & INTR_VBUS_VLD)
 493                 otg_ctrl |= OTG_VBUSVLD;
 494         if (int_src & INTR_ID_GND) {            /* default-A */
 495                 if (isp->phy.otg->state == OTG_STATE_B_IDLE
 496                                 || isp->phy.otg->state
 497                                         == OTG_STATE_UNDEFINED) {
 498                         a_idle(isp, "init");
 499                         return;
 500                 }
 501         } else {                                /* default-B */
 502                 otg_ctrl |= OTG_ID;
 503                 if (isp->phy.otg->state == OTG_STATE_A_IDLE
 504                         || isp->phy.otg->state == OTG_STATE_UNDEFINED) {
 505                         b_idle(isp, "init");
 506                         return;
 507                 }
 508         }
 509         omap_writel(otg_ctrl, OTG_CTRL);
 510 }
 511
 512 /* outputs from ISP1301_OTG_STATUS */
 513 static void update_otg2(struct isp1301 *isp, u8 otg_status)
 514 {
 515         u32     otg_ctrl;
 516
 517         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
 518         otg_ctrl &= ~OTG_XCEIV_INPUTS;
 519         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 520         if (otg_status & OTG_B_SESS_VLD)
 521                 otg_ctrl |= OTG_BSESSVLD;
 522         else if (otg_status & OTG_B_SESS_END)
 523                 otg_ctrl |= OTG_BSESSEND;
 524         omap_writel(otg_ctrl, OTG_CTRL);
 525 }
 526
 527 /* inputs going to ISP1301 */
 528 static void otg_update_isp(struct isp1301 *isp)
 529 {
 530         u32     otg_ctrl, otg_change;
 531         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 532
 533         otg_ctrl = omap_readl(OTG_CTRL);
 534         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 535         isp->last_otg_ctrl = otg_ctrl;
 536         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
 537
 538         switch (isp->phy.otg->state) {
 539         case OTG_STATE_B_IDLE:
 540         case OTG_STATE_B_PERIPHERAL:
 541         case OTG_STATE_B_SRP_INIT:
 542                 if (!(otg_ctrl & OTG_PULLUP)) {
 543                         // if (otg_ctrl & OTG_B_HNPEN) {
 544                         if (isp->phy.otg->gadget->b_hnp_enable) {
 545                                 isp->phy.otg->state = OTG_STATE_B_WAIT_ACON;
 546                                 pr_debug("  --> b_wait_acon\n");
 547                         }
 548                         goto pulldown;
 549                 }
 550 pullup:
 551                 set |= OTG1_DP_PULLUP;
 552                 clr |= OTG1_DP_PULLDOWN;
 553                 break;
 554         case OTG_STATE_A_SUSPEND:
 555         case OTG_STATE_A_PERIPHERAL:
 556                 if (otg_ctrl & OTG_PULLUP)
 557                         goto pullup;
 558                 /* FALLTHROUGH */
 559         // case OTG_STATE_B_WAIT_ACON:
 560         default:
 561 pulldown:
 562                 set |= OTG1_DP_PULLDOWN;
 563                 clr |= OTG1_DP_PULLUP;
 564                 break;
 565         }
 566
 567 #       define toggle(OTG,ISP) do { \
 568                 if (otg_ctrl & OTG) set |= ISP; \
 569                 else clr |= ISP; \
 570                 } while (0)
 571
 572         if (!(isp->phy.otg->host))
 573                 otg_ctrl &= ~OTG_DRV_VBUS;
 574
 575         switch (isp->phy.otg->state) {
 576         case OTG_STATE_A_SUSPEND:
 577                 if (otg_ctrl & OTG_DRV_VBUS) {
 578                         set |= OTG1_VBUS_DRV;
 579                         break;
 580                 }
 581                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
 582                 notresponding(isp);
 583
 584                 fallthrough;
 585         case OTG_STATE_A_VBUS_ERR:
 586                 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
 587                 pr_debug("  --> a_wait_vfall\n");
 588                 fallthrough;
 589         case OTG_STATE_A_WAIT_VFALL:
 590                 /* FIXME usbcore thinks port power is still on ... */
 591                 clr |= OTG1_VBUS_DRV;
 592                 break;
 593         case OTG_STATE_A_IDLE:
 594                 if (otg_ctrl & OTG_DRV_VBUS) {
 595                         isp->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
 596                         pr_debug("  --> a_wait_vrise\n");
 597                 }
 598                 fallthrough;
 599         default:
 600                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 601         }
 602
 603         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
 604         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
 605
 606 #       undef toggle
 607
 608         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
 609         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
 610
 611         /* HNP switch to host or peripheral; and SRP */
 612         if (otg_change & OTG_PULLUP) {
 613                 u32 l;
 614
 615                 switch (isp->phy.otg->state) {
 616                 case OTG_STATE_B_IDLE:
 617                         if (clr & OTG1_DP_PULLUP)
 618                                 break;
 619                         isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
 620                         pr_debug("  --> b_peripheral\n");
 621                         break;
 622                 case OTG_STATE_A_SUSPEND:
 623                         if (clr & OTG1_DP_PULLUP)
 624                                 break;
 625                         isp->phy.otg->state = OTG_STATE_A_PERIPHERAL;
 626                         pr_debug("  --> a_peripheral\n");
 627                         break;
 628                 default:
 629                         break;
 630                 }
 631                 l = omap_readl(OTG_CTRL);
 632                 l |= OTG_PULLUP;
 633                 omap_writel(l, OTG_CTRL);
 634         }
 635
 636         check_state(isp, __func__);
 637         dump_regs(isp, "otg->isp1301");
 638 }
 639
 640 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 641 {
 642         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
 643         u32             otg_ctrl;
 644         int             ret = IRQ_NONE;
 645         struct isp1301  *isp = _isp;
 646         struct usb_otg  *otg = isp->phy.otg;
 647
 648         /* update ISP1301 transceiver from OTG controller */
 649         if (otg_irq & OPRT_CHG) {
 650                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 651                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 652                 ret = IRQ_HANDLED;
 653
 654         /* SRP to become b_peripheral failed */
 655         } else if (otg_irq & B_SRP_TMROUT) {
 656                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 657                 notresponding(isp);
 658
 659                 /* gadget drivers that care should monitor all kinds of
 660                  * remote wakeup (SRP, normal) using their own timer
 661                  * to give "check cable and A-device" messages.
 662                  */
 663                 if (isp->phy.otg->state == OTG_STATE_B_SRP_INIT)
 664                         b_idle(isp, "srp_timeout");
 665
 666                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 667                 ret = IRQ_HANDLED;
 668
 669         /* HNP to become b_host failed */
 670         } else if (otg_irq & B_HNP_FAIL) {
 671                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
 672                                 state_name(isp), omap_readl(OTG_CTRL));
 673                 notresponding(isp);
 674
 675                 otg_ctrl = omap_readl(OTG_CTRL);
 676                 otg_ctrl |= OTG_BUSDROP;
 677                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 678                 omap_writel(otg_ctrl, OTG_CTRL);
 679
 680                 /* subset of b_peripheral()... */
 681                 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
 682                 pr_debug("  --> b_peripheral\n");
 683
 684                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 685                 ret = IRQ_HANDLED;
 686
 687         /* detect SRP from B-device ... */
 688         } else if (otg_irq & A_SRP_DETECT) {
 689                 pr_debug("otg: %s SRP_DETECT, %06x\n",
 690                                 state_name(isp), omap_readl(OTG_CTRL));
 691
 692                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
 693                 switch (isp->phy.otg->state) {
 694                 case OTG_STATE_A_IDLE:
 695                         if (!otg->host)
 696                                 break;
 697                         isp1301_defer_work(isp, WORK_HOST_RESUME);
 698                         otg_ctrl = omap_readl(OTG_CTRL);
 699                         otg_ctrl |= OTG_A_BUSREQ;
 700                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 701                                         & ~OTG_XCEIV_INPUTS
 702                                         & OTG_CTRL_MASK;
 703                         omap_writel(otg_ctrl, OTG_CTRL);
 704                         break;
 705                 default:
 706                         break;
 707                 }
 708
 709                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 710                 ret = IRQ_HANDLED;
 711
 712         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 713          * we don't track them separately
 714          */
 715         } else if (otg_irq & A_REQ_TMROUT) {
 716                 otg_ctrl = omap_readl(OTG_CTRL);
 717                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
 718                                 state_name(isp), otg_ctrl);
 719                 notresponding(isp);
 720
 721                 otg_ctrl |= OTG_BUSDROP;
 722                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 723                 omap_writel(otg_ctrl, OTG_CTRL);
 724                 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
 725
 726                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 727                 ret = IRQ_HANDLED;
 728
 729         /* A-supplied voltage fell too low; overcurrent */
 730         } else if (otg_irq & A_VBUS_ERR) {
 731                 otg_ctrl = omap_readl(OTG_CTRL);
 732                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 733                         state_name(isp), otg_irq, otg_ctrl);
 734
 735                 otg_ctrl |= OTG_BUSDROP;
 736                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 737                 omap_writel(otg_ctrl, OTG_CTRL);
 738                 isp->phy.otg->state = OTG_STATE_A_VBUS_ERR;
 739
 740                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 741                 ret = IRQ_HANDLED;
 742
 743         /* switch driver; the transceiver code activates it,
 744          * ungating the udc clock or resuming OHCI.
 745          */
 746         } else if (otg_irq & DRIVER_SWITCH) {
 747                 int     kick = 0;
 748
 749                 otg_ctrl = omap_readl(OTG_CTRL);
 750                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 751                                 state_name(isp),
 752                                 (otg_ctrl & OTG_DRIVER_SEL)
 753                                         ? "gadget" : "host",
 754                                 otg_ctrl);
 755                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
 756
 757                 /* role is peripheral */
 758                 if (otg_ctrl & OTG_DRIVER_SEL) {
 759                         switch (isp->phy.otg->state) {
 760                         case OTG_STATE_A_IDLE:
 761                                 b_idle(isp, __func__);
 762                                 break;
 763                         default:
 764                                 break;
 765                         }
 766                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
 767
 768                 /* role is host */
 769                 } else {
 770                         if (!(otg_ctrl & OTG_ID)) {
 771                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
 772                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 773                         }
 774
 775                         if (otg->host) {
 776                                 switch (isp->phy.otg->state) {
 777                                 case OTG_STATE_B_WAIT_ACON:
 778                                         isp->phy.otg->state = OTG_STATE_B_HOST;
 779                                         pr_debug("  --> b_host\n");
 780                                         kick = 1;
 781                                         break;
 782                                 case OTG_STATE_A_WAIT_BCON:
 783                                         isp->phy.otg->state = OTG_STATE_A_HOST;
 784                                         pr_debug("  --> a_host\n");
 785                                         break;
 786                                 case OTG_STATE_A_PERIPHERAL:
 787                                         isp->phy.otg->state = OTG_STATE_A_WAIT_BCON;
 788                                         pr_debug("  --> a_wait_bcon\n");
 789                                         break;
 790                                 default:
 791                                         break;
 792                                 }
 793                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 794                         }
 795                 }
 796
 797                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 798                 ret = IRQ_HANDLED;
 799
 800                 if (kick)
 801                         usb_bus_start_enum(otg->host, otg->host->otg_port);
 802         }
 803
 804         check_state(isp, __func__);
 805         return ret;
 806 }
 807
 808 static struct platform_device *otg_dev;
 809
 810 static int isp1301_otg_init(struct isp1301 *isp)
 811 {
 812         u32 l;
 813
 814         if (!otg_dev)
 815                 return -ENODEV;
 816
 817         dump_regs(isp, __func__);
 818         /* some of these values are board-specific... */
 819         l = omap_readl(OTG_SYSCON_2);
 820         l |= OTG_EN
 821                 /* for B-device: */
 822                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
 823                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
 824                 // | (3 << 24)          /* 2msec VBUS pulse */
 825                 /* for A-device: */
 826                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
 827                 | SRP_DPW               /* detect 167+ns SRP pulses */
 828                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
 829                 ;
 830         omap_writel(l, OTG_SYSCON_2);
 831
 832         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 833         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 834
 835         check_state(isp, __func__);
 836         pr_debug("otg: %s, %s %06x\n",
 837                         state_name(isp), __func__, omap_readl(OTG_CTRL));
 838
 839         omap_writew(DRIVER_SWITCH | OPRT_CHG
 840                         | B_SRP_TMROUT | B_HNP_FAIL
 841                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
 842
 843         l = omap_readl(OTG_SYSCON_2);
 844         l |= OTG_EN;
 845         omap_writel(l, OTG_SYSCON_2);
 846
 847         return 0;
 848 }
 849
 850 static int otg_probe(struct platform_device *dev)
 851 {
 852         // struct omap_usb_config *config = dev->platform_data;
 853
 854         otg_dev = dev;
 855         return 0;
 856 }
 857
 858 static int otg_remove(struct platform_device *dev)
 859 {
 860         otg_dev = NULL;
 861         return 0;
 862 }
 863
 864 static struct platform_driver omap_otg_driver = {
 865         .probe          = otg_probe,
 866         .remove         = otg_remove,
 867         .driver         = {
 868                 .name   = "omap_otg",
 869         },
 870 };
 871
 872 static int otg_bind(struct isp1301 *isp)
 873 {
 874         int     status;
 875
 876         if (otg_dev)
 877                 return -EBUSY;
 878
 879         status = platform_driver_register(&omap_otg_driver);
 880         if (status < 0)
 881                 return status;
 882
 883         if (otg_dev)
 884                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
 885                                 0, DRIVER_NAME, isp);
 886         else
 887                 status = -ENODEV;
 888
 889         if (status < 0)
 890                 platform_driver_unregister(&omap_otg_driver);
 891         return status;
 892 }
 893
 894 static void otg_unbind(struct isp1301 *isp)
 895 {
 896         if (!otg_dev)
 897                 return;
 898         free_irq(otg_dev->resource[1].start, isp);
 899 }
 900
 901 #else
 902
 903 /* OTG controller isn't clocked */
 904
 905 #endif  /* CONFIG_USB_OTG */
 906
 907 /*-------------------------------------------------------------------------*/
 908
 909 static void b_peripheral(struct isp1301 *isp)
 910 {
 911         u32 l;
 912
 913         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 914         omap_writel(l, OTG_CTRL);
 915
 916         usb_gadget_vbus_connect(isp->phy.otg->gadget);
 917
 918 #ifdef  CONFIG_USB_OTG
 919         enable_vbus_draw(isp, 8);
 920         otg_update_isp(isp);
 921 #else
 922         enable_vbus_draw(isp, 100);
 923         /* UDC driver just set OTG_BSESSVLD */
 924         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
 925         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
 926         isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
 927         pr_debug("  --> b_peripheral\n");
 928         dump_regs(isp, "2periph");
 929 #endif
 930 }
 931
 932 static void isp_update_otg(struct isp1301 *isp, u8 stat)
 933 {
 934         struct usb_otg          *otg = isp->phy.otg;
 935         u8                      isp_stat, isp_bstat;
 936         enum usb_otg_state      state = isp->phy.otg->state;
 937
 938         if (stat & INTR_BDIS_ACON)
 939                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
 940
 941         /* start certain state transitions right away */
 942         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 943         if (isp_stat & INTR_ID_GND) {
 944                 if (otg->default_a) {
 945                         switch (state) {
 946                         case OTG_STATE_B_IDLE:
 947                                 a_idle(isp, "idle");
 948                                 fallthrough;
 949                         case OTG_STATE_A_IDLE:
 950                                 enable_vbus_source(isp);
 951                                 fallthrough;
 952                         case OTG_STATE_A_WAIT_VRISE:
 953                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
 954                                  * the HC will transition to A_HOST (or
 955                                  * A_SUSPEND!) without our noticing except
 956                                  * when HNP is used.
 957                                  */
 958                                 if (isp_stat & INTR_VBUS_VLD)
 959                                         isp->phy.otg->state = OTG_STATE_A_HOST;
 960                                 break;
 961                         case OTG_STATE_A_WAIT_VFALL:
 962                                 if (!(isp_stat & INTR_SESS_VLD))
 963                                         a_idle(isp, "vfell");
 964                                 break;
 965                         default:
 966                                 if (!(isp_stat & INTR_VBUS_VLD))
 967                                         isp->phy.otg->state = OTG_STATE_A_VBUS_ERR;
 968                                 break;
 969                         }
 970                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
 971                 } else {
 972                         switch (state) {
 973                         case OTG_STATE_B_PERIPHERAL:
 974                         case OTG_STATE_B_HOST:
 975                         case OTG_STATE_B_WAIT_ACON:
 976                                 usb_gadget_vbus_disconnect(otg->gadget);
 977                                 break;
 978                         default:
 979                                 break;
 980                         }
 981                         if (state != OTG_STATE_A_IDLE)
 982                                 a_idle(isp, "id");
 983                         if (otg->host && state == OTG_STATE_A_IDLE)
 984                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
 985                         isp_bstat = 0;
 986                 }
 987         } else {
 988                 u32 l;
 989
 990                 /* if user unplugged mini-A end of cable,
 991                  * don't bypass A_WAIT_VFALL.
 992                  */
 993                 if (otg->default_a) {
 994                         switch (state) {
 995                         default:
 996                                 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
 997                                 break;
 998                         case OTG_STATE_A_WAIT_VFALL:
 999                                 state = OTG_STATE_A_IDLE;
1000                                 /* hub_wq may take a while to notice and
1001                                  * handle this disconnect, so don't go
1002                                  * to B_IDLE quite yet.
1003                                  */
1004                                 break;
1005                         case OTG_STATE_A_IDLE:
1006                                 host_suspend(isp);
1007                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1008                                                 MC1_BDIS_ACON_EN);
1009                                 isp->phy.otg->state = OTG_STATE_B_IDLE;
1010                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1011                                 l &= ~OTG_CTRL_BITS;
1012                                 omap_writel(l, OTG_CTRL);
1013                                 break;
1014                         case OTG_STATE_B_IDLE:
1015                                 break;
1016                         }
1017                 }
1018                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1019
1020                 switch (isp->phy.otg->state) {
1021                 case OTG_STATE_B_PERIPHERAL:
1022                 case OTG_STATE_B_WAIT_ACON:
1023                 case OTG_STATE_B_HOST:
1024                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1025                                 break;
1026                         enable_vbus_draw(isp, 0);
1027 #ifndef CONFIG_USB_OTG
1028                         /* UDC driver will clear OTG_BSESSVLD */
1029                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1030                                                 OTG1_DP_PULLDOWN);
1031                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1032                                                 OTG1_DP_PULLUP);
1033                         dump_regs(isp, __func__);
1034 #endif
1035                         fallthrough;
1036                 case OTG_STATE_B_SRP_INIT:
1037                         b_idle(isp, __func__);
1038                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1039                         omap_writel(l, OTG_CTRL);
1040                         fallthrough;
1041                 case OTG_STATE_B_IDLE:
1042                         if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1043 #ifdef  CONFIG_USB_OTG
1044                                 update_otg1(isp, isp_stat);
1045                                 update_otg2(isp, isp_bstat);
1046 #endif
1047                                 b_peripheral(isp);
1048                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1049                                 isp_bstat |= OTG_B_SESS_END;
1050                         break;
1051                 case OTG_STATE_A_WAIT_VFALL:
1052                         break;
1053                 default:
1054                         pr_debug("otg: unsupported b-device %s\n",
1055                                 state_name(isp));
1056                         break;
1057                 }
1058         }
1059
1060         if (state != isp->phy.otg->state)
1061                 pr_debug("  isp, %s -> %s\n",
1062                                 usb_otg_state_string(state), state_name(isp));
1063
1064 #ifdef  CONFIG_USB_OTG
1065         /* update the OTG controller state to match the isp1301; may
1066          * trigger OPRT_CHG irqs for changes going to the isp1301.
1067          */
1068         update_otg1(isp, isp_stat);
1069         update_otg2(isp, isp_bstat);
1070         check_state(isp, __func__);
1071 #endif
1072
1073         dump_regs(isp, "isp1301->otg");
1074 }
1075
1076 /*-------------------------------------------------------------------------*/
1077
1078 static u8 isp1301_clear_latch(struct isp1301 *isp)
1079 {
1080         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1081         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1082         return latch;
1083 }
1084
1085 static void
1086 isp1301_work(struct work_struct *work)
1087 {
1088         struct isp1301  *isp = container_of(work, struct isp1301, work);
1089         int             stop;
1090
1091         /* implicit lock:  we're the only task using this device */
1092         isp->working = 1;
1093         do {
1094                 stop = test_bit(WORK_STOP, &isp->todo);
1095
1096 #ifdef  CONFIG_USB_OTG
1097                 /* transfer state from otg engine to isp1301 */
1098                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1099                         otg_update_isp(isp);
1100                         put_device(&isp->client->dev);
1101                 }
1102 #endif
1103                 /* transfer state from isp1301 to otg engine */
1104                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1105                         u8              stat = isp1301_clear_latch(isp);
1106
1107                         isp_update_otg(isp, stat);
1108                         put_device(&isp->client->dev);
1109                 }
1110
1111                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1112                         u32     otg_ctrl;
1113
1114                         /*
1115                          * skip A_WAIT_VRISE; hc transitions invisibly
1116                          * skip A_WAIT_BCON; same.
1117                          */
1118                         switch (isp->phy.otg->state) {
1119                         case OTG_STATE_A_WAIT_BCON:
1120                         case OTG_STATE_A_WAIT_VRISE:
1121                                 isp->phy.otg->state = OTG_STATE_A_HOST;
1122                                 pr_debug("  --> a_host\n");
1123                                 otg_ctrl = omap_readl(OTG_CTRL);
1124                                 otg_ctrl |= OTG_A_BUSREQ;
1125                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1126                                                 & OTG_CTRL_MASK;
1127                                 omap_writel(otg_ctrl, OTG_CTRL);
1128                                 break;
1129                         case OTG_STATE_B_WAIT_ACON:
1130                                 isp->phy.otg->state = OTG_STATE_B_HOST;
1131                                 pr_debug("  --> b_host (acon)\n");
1132                                 break;
1133                         case OTG_STATE_B_HOST:
1134                         case OTG_STATE_B_IDLE:
1135                         case OTG_STATE_A_IDLE:
1136                                 break;
1137                         default:
1138                                 pr_debug("  host resume in %s\n",
1139                                                 state_name(isp));
1140                         }
1141                         host_resume(isp);
1142                         // mdelay(10);
1143                         put_device(&isp->client->dev);
1144                 }
1145
1146                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1147 #ifdef  VERBOSE
1148                         dump_regs(isp, "timer");
1149                         if (!stop)
1150                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1151 #endif
1152                         put_device(&isp->client->dev);
1153                 }
1154
1155                 if (isp->todo)
1156                         dev_vdbg(&isp->client->dev,
1157                                 "work done, todo = 0x%lx\n",
1158                                 isp->todo);
1159                 if (stop) {
1160                         dev_dbg(&isp->client->dev, "stop\n");
1161                         break;
1162                 }
1163         } while (isp->todo);
1164         isp->working = 0;
1165 }
1166
1167 static irqreturn_t isp1301_irq(int irq, void *isp)
1168 {
1169         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1170         return IRQ_HANDLED;
1171 }
1172
1173 static void isp1301_timer(struct timer_list *t)
1174 {
1175         struct isp1301 *isp = from_timer(isp, t, timer);
1176
1177         isp1301_defer_work(isp, WORK_TIMER);
1178 }
1179
1180 /*-------------------------------------------------------------------------*/
1181
1182 static void isp1301_release(struct device *dev)
1183 {
1184         struct isp1301  *isp;
1185
1186         isp = dev_get_drvdata(dev);
1187
1188         /* FIXME -- not with a "new style" driver, it doesn't!! */
1189
1190         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1191         if (isp->i2c_release)
1192                 isp->i2c_release(dev);
1193         kfree(isp->phy.otg);
1194         kfree (isp);
1195 }
1196
1197 static struct isp1301 *the_transceiver;
1198
1199 static int isp1301_remove(struct i2c_client *i2c)
1200 {
1201         struct isp1301  *isp;
1202
1203         isp = i2c_get_clientdata(i2c);
1204
1205         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1206         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1207         free_irq(i2c->irq, isp);
1208 #ifdef  CONFIG_USB_OTG
1209         otg_unbind(isp);
1210 #endif
1211         set_bit(WORK_STOP, &isp->todo);
1212         del_timer_sync(&isp->timer);
1213         flush_work(&isp->work);
1214
1215         put_device(&i2c->dev);
1216         the_transceiver = NULL;
1217
1218         return 0;
1219 }
1220
1221 /*-------------------------------------------------------------------------*/
1222
1223 /* NOTE:  three modes are possible here, only one of which
1224  * will be standards-conformant on any given system:
1225  *
1226  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1227  *  - HOST mode, for when there's one or more A (host) connectors
1228  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1229  *
1230  * As a rule, you won't have an isp1301 chip unless it's there to
1231  * support the OTG mode.  Other modes help testing USB controllers
1232  * in isolation from (full) OTG support, or maybe so later board
1233  * revisions can help to support those feature.
1234  */
1235
1236 #ifdef  CONFIG_USB_OTG
1237
1238 static int isp1301_otg_enable(struct isp1301 *isp)
1239 {
1240         power_up(isp);
1241         isp1301_otg_init(isp);
1242
1243         /* NOTE:  since we don't change this, this provides
1244          * a few more interrupts than are strictly needed.
1245          */
1246         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1247                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1248         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1249                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1250
1251         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1252
1253         return 0;
1254 }
1255
1256 #endif
1257
1258 /* add or disable the host device+driver */
1259 static int
1260 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1261 {
1262         struct isp1301  *isp = container_of(otg->usb_phy, struct isp1301, phy);
1263
1264         if (isp != the_transceiver)
1265                 return -ENODEV;
1266
1267         if (!host) {
1268                 omap_writew(0, OTG_IRQ_EN);
1269                 power_down(isp);
1270                 otg->host = NULL;
1271                 return 0;
1272         }
1273
1274 #ifdef  CONFIG_USB_OTG
1275         otg->host = host;
1276         dev_dbg(&isp->client->dev, "registered host\n");
1277         host_suspend(isp);
1278         if (otg->gadget)
1279                 return isp1301_otg_enable(isp);
1280         return 0;
1281
1282 #elif !IS_ENABLED(CONFIG_USB_OMAP)
1283         // FIXME update its refcount
1284         otg->host = host;
1285
1286         power_up(isp);
1287
1288         if (machine_is_omap_h2())
1289                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1290
1291         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1292         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1293                 INTR_ID_GND);
1294         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1295                 INTR_ID_GND);
1296
1297         /* If this has a Mini-AB connector, this mode is highly
1298          * nonstandard ... but can be handy for testing, especially with
1299          * the Mini-A end of an OTG cable.  (Or something nonstandard
1300          * like MiniB-to-StandardB, maybe built with a gender mender.)
1301          */
1302         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1303
1304         dump_regs(isp, __func__);
1305
1306         return 0;
1307
1308 #else
1309         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1310         return -EINVAL;
1311 #endif
1312
1313 }
1314
1315 static int
1316 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1317 {
1318         struct isp1301  *isp = container_of(otg->usb_phy, struct isp1301, phy);
1319
1320         if (isp != the_transceiver)
1321                 return -ENODEV;
1322
1323         if (!gadget) {
1324                 omap_writew(0, OTG_IRQ_EN);
1325                 if (!otg->default_a)
1326                         enable_vbus_draw(isp, 0);
1327                 usb_gadget_vbus_disconnect(otg->gadget);
1328                 otg->gadget = NULL;
1329                 power_down(isp);
1330                 return 0;
1331         }
1332
1333 #ifdef  CONFIG_USB_OTG
1334         otg->gadget = gadget;
1335         dev_dbg(&isp->client->dev, "registered gadget\n");
1336         /* gadget driver may be suspended until vbus_connect () */
1337         if (otg->host)
1338                 return isp1301_otg_enable(isp);
1339         return 0;
1340
1341 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1342         otg->gadget = gadget;
1343         // FIXME update its refcount
1344
1345         {
1346                 u32 l;
1347
1348                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1349                 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1350                 l |= OTG_ID;
1351                 omap_writel(l, OTG_CTRL);
1352         }
1353
1354         power_up(isp);
1355         isp->phy.otg->state = OTG_STATE_B_IDLE;
1356
1357         if (machine_is_omap_h2() || machine_is_omap_h3())
1358                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1359
1360         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1361                 INTR_SESS_VLD);
1362         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1363                 INTR_VBUS_VLD);
1364         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1365         dump_regs(isp, __func__);
1366
1367         /* If this has a Mini-AB connector, this mode is highly
1368          * nonstandard ... but can be handy for testing, so long
1369          * as you don't plug a Mini-A cable into the jack.
1370          */
1371         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1372                 b_peripheral(isp);
1373
1374         return 0;
1375
1376 #else
1377         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1378         return -EINVAL;
1379 #endif
1380 }
1381
1382
1383 /*-------------------------------------------------------------------------*/
1384
1385 static int
1386 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1387 {
1388         if (!the_transceiver)
1389                 return -ENODEV;
1390         if (dev->otg->state == OTG_STATE_B_PERIPHERAL)
1391                 enable_vbus_draw(the_transceiver, mA);
1392         return 0;
1393 }
1394
1395 static int
1396 isp1301_start_srp(struct usb_otg *otg)
1397 {
1398         struct isp1301  *isp = container_of(otg->usb_phy, struct isp1301, phy);
1399         u32             otg_ctrl;
1400
1401         if (isp != the_transceiver || isp->phy.otg->state != OTG_STATE_B_IDLE)
1402                 return -ENODEV;
1403
1404         otg_ctrl = omap_readl(OTG_CTRL);
1405         if (!(otg_ctrl & OTG_BSESSEND))
1406                 return -EINVAL;
1407
1408         otg_ctrl |= OTG_B_BUSREQ;
1409         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1410         omap_writel(otg_ctrl, OTG_CTRL);
1411         isp->phy.otg->state = OTG_STATE_B_SRP_INIT;
1412
1413         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1414                         omap_readl(OTG_CTRL));
1415 #ifdef  CONFIG_USB_OTG
1416         check_state(isp, __func__);
1417 #endif
1418         return 0;
1419 }
1420
1421 static int
1422 isp1301_start_hnp(struct usb_otg *otg)
1423 {
1424 #ifdef  CONFIG_USB_OTG
1425         struct isp1301  *isp = container_of(otg->usb_phy, struct isp1301, phy);
1426         u32 l;
1427
1428         if (isp != the_transceiver)
1429                 return -ENODEV;
1430         if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1431                 return -ENOTCONN;
1432         if (!otg->default_a && (otg->gadget == NULL
1433                         || !otg->gadget->b_hnp_enable))
1434                 return -ENOTCONN;
1435
1436         /* We want hardware to manage most HNP protocol timings.
1437          * So do this part as early as possible...
1438          */
1439         switch (isp->phy.otg->state) {
1440         case OTG_STATE_B_HOST:
1441                 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
1442                 /* caller will suspend next */
1443                 break;
1444         case OTG_STATE_A_HOST:
1445 #if 0
1446                 /* autoconnect mode avoids irq latency bugs */
1447                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1448                                 MC1_BDIS_ACON_EN);
1449 #endif
1450                 /* caller must suspend then clear A_BUSREQ */
1451                 usb_gadget_vbus_connect(otg->gadget);
1452                 l = omap_readl(OTG_CTRL);
1453                 l |= OTG_A_SETB_HNPEN;
1454                 omap_writel(l, OTG_CTRL);
1455
1456                 break;
1457         case OTG_STATE_A_PERIPHERAL:
1458                 /* initiated by B-Host suspend */
1459                 break;
1460         default:
1461                 return -EILSEQ;
1462         }
1463         pr_debug("otg: HNP %s, %06x ...\n",
1464                 state_name(isp), omap_readl(OTG_CTRL));
1465         check_state(isp, __func__);
1466         return 0;
1467 #else
1468         /* srp-only */
1469         return -EINVAL;
1470 #endif
1471 }
1472
1473 /*-------------------------------------------------------------------------*/
1474
1475 static int
1476 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1477 {
1478         int                     status;
1479         struct isp1301          *isp;
1480         int irq;
1481
1482         if (the_transceiver)
1483                 return 0;
1484
1485         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1486         if (!isp)
1487                 return 0;
1488
1489         isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1490         if (!isp->phy.otg) {
1491                 kfree(isp);
1492                 return 0;
1493         }
1494
1495         INIT_WORK(&isp->work, isp1301_work);
1496         timer_setup(&isp->timer, isp1301_timer, 0);
1497
1498         i2c_set_clientdata(i2c, isp);
1499         isp->client = i2c;
1500
1501         /* verify the chip (shouldn't be necessary) */
1502         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1503         if (status != I2C_VENDOR_ID_PHILIPS) {
1504                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1505                 goto fail;
1506         }
1507         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1508         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1509                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1510                 goto fail;
1511         }
1512         isp->i2c_release = i2c->dev.release;
1513         i2c->dev.release = isp1301_release;
1514
1515         /* initial development used chiprev 2.00 */
1516         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1517         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1518                 status >> 8, status & 0xff);
1519
1520         /* make like power-on reset */
1521         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1522
1523         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1524         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1525
1526         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1527                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1528         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1529                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1530
1531         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1532         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1533         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1534
1535 #ifdef  CONFIG_USB_OTG
1536         status = otg_bind(isp);
1537         if (status < 0) {
1538                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1539                 goto fail;
1540         }
1541 #endif
1542
1543         if (machine_is_omap_h2()) {
1544                 struct gpio_desc *gpiod;
1545
1546                 /* full speed signaling by default */
1547                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1548                         MC1_SPEED);
1549                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1550                         MC2_SPD_SUSP_CTRL);
1551
1552                 gpiod = devm_gpiod_get(&i2c->dev, NULL, GPIOD_IN);
1553                 if (IS_ERR(gpiod)) {
1554                         dev_err(&i2c->dev, "cannot obtain H2 GPIO\n");
1555                         goto fail;
1556                 }
1557                 gpiod_set_consumer_name(gpiod, "isp1301");
1558                 irq = gpiod_to_irq(gpiod);
1559                 isp->irq_type = IRQF_TRIGGER_FALLING;
1560         } else {
1561                 irq = i2c->irq;
1562         }
1563
1564         status = request_irq(irq, isp1301_irq,
1565                         isp->irq_type, DRIVER_NAME, isp);
1566         if (status < 0) {
1567                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1568                                 i2c->irq, status);
1569                 goto fail;
1570         }
1571
1572         isp->phy.dev = &i2c->dev;
1573         isp->phy.label = DRIVER_NAME;
1574         isp->phy.set_power = isp1301_set_power;
1575
1576         isp->phy.otg->usb_phy = &isp->phy;
1577         isp->phy.otg->set_host = isp1301_set_host;
1578         isp->phy.otg->set_peripheral = isp1301_set_peripheral;
1579         isp->phy.otg->start_srp = isp1301_start_srp;
1580         isp->phy.otg->start_hnp = isp1301_start_hnp;
1581
1582         enable_vbus_draw(isp, 0);
1583         power_down(isp);
1584         the_transceiver = isp;
1585
1586 #ifdef  CONFIG_USB_OTG
1587         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1588         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1589 #endif
1590
1591         dump_regs(isp, __func__);
1592
1593 #ifdef  VERBOSE
1594         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1595         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1596 #endif
1597
1598         status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1599         if (status < 0)
1600                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1601                         status);
1602
1603         return 0;
1604
1605 fail:
1606         kfree(isp->phy.otg);
1607         kfree(isp);
1608         return -ENODEV;
1609 }
1610
1611 static const struct i2c_device_id isp1301_id[] = {
1612         { "isp1301_omap", 0 },
1613         { }
1614 };
1615 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1616
1617 static struct i2c_driver isp1301_driver = {
1618         .driver = {
1619                 .name   = "isp1301_omap",
1620         },
1621         .probe          = isp1301_probe,
1622         .remove         = isp1301_remove,
1623         .id_table       = isp1301_id,
1624 };
1625
1626 /*-------------------------------------------------------------------------*/
1627
1628 static int __init isp_init(void)
1629 {
1630         return i2c_add_driver(&isp1301_driver);
1631 }
1632 subsys_initcall(isp_init);
1633
1634 static void __exit isp_exit(void)
1635 {
1636         if (the_transceiver)
1637                 usb_remove_phy(&the_transceiver->phy);
1638         i2c_del_driver(&isp1301_driver);
1639 }
1640 module_exit(isp_exit);
1641