linux/drivers/usb/phy/phy-isp1301-omap.c
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   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
  49MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
  50MODULE_LICENSE("GPL");
  51
  52struct 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
 103static 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
 111static 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
 120static 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
 130static 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 */
 139static inline void notresponding(struct isp1301 *isp)
 140{
 141        printk(KERN_NOTICE "OTG device not responding.\n");
 142}
 143
 144
 145/*-------------------------------------------------------------------------*/
 146
 147static struct i2c_driver isp1301_driver;
 148
 149/* smbus apis are used for portability */
 150
 151static inline u8
 152isp1301_get_u8(struct isp1301 *isp, u8 reg)
 153{
 154        return i2c_smbus_read_byte_data(isp->client, reg + 0);
 155}
 156
 157static inline int
 158isp1301_get_u16(struct isp1301 *isp, u8 reg)
 159{
 160        return i2c_smbus_read_word_data(isp->client, reg);
 161}
 162
 163static inline int
 164isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
 165{
 166        return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
 167}
 168
 169static inline int
 170isp1301_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
 235static 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
 250static 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
 261static 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
 274static 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
 292static 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
 307static 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 */
 324static 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 */
 338static 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 */
 362static 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
 385static void
 386dump_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
 412static 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
 486static inline void check_state(struct isp1301 *isp, const char *tag) { }
 487
 488#endif
 489
 490/* outputs from ISP1301_INTERRUPT_SOURCE */
 491static 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 */
 526static 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 */
 541static 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                }
 563pullup:
 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:
 574pulldown:
 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
 653static 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
 821static struct platform_device *otg_dev;
 822
 823static 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
 863static 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
 871static int otg_remove(struct platform_device *dev)
 872{
 873        otg_dev = NULL;
 874        return 0;
 875}
 876
 877static 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
 886static 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
 908static 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
 923static 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
 946static 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
1092static 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
1099static void
1100isp1301_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
1181static irqreturn_t isp1301_irq(int irq, void *isp)
1182{
1183        isp1301_defer_work(isp, WORK_UPDATE_OTG);
1184        return IRQ_HANDLED;
1185}
1186
1187static void isp1301_timer(unsigned long _isp)
1188{
1189        isp1301_defer_work((void *)_isp, WORK_TIMER);
1190}
1191
1192/*-------------------------------------------------------------------------*/
1193
1194static 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
1209static struct isp1301 *the_transceiver;
1210
1211static 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
1254static 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 */
1275static int
1276isp1301_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   !defined(CONFIG_USB_GADGET_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
1331static int
1332isp1301_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
1401static int
1402isp1301_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
1411static int
1412isp1301_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
1437static int
1438isp1301_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
1491static int
1492isp1301_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
1615fail:
1616        kfree(isp->phy.otg);
1617        kfree(isp);
1618        return -ENODEV;
1619}
1620
1621static const struct i2c_device_id isp1301_id[] = {
1622        { "isp1301_omap", 0 },
1623        { }
1624};
1625MODULE_DEVICE_TABLE(i2c, isp1301_id);
1626
1627static 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
1638static int __init isp_init(void)
1639{
1640        return i2c_add_driver(&isp1301_driver);
1641}
1642subsys_initcall(isp_init);
1643
1644static void __exit isp_exit(void)
1645{
1646        if (the_transceiver)
1647                usb_remove_phy(&the_transceiver->phy);
1648        i2c_del_driver(&isp1301_driver);
1649}
1650module_exit(isp_exit);
1651
1652