drivers/usb/musb/omap2430.c

   1 /*
   2  * Copyright (C) 2005-2007 by Texas Instruments
   3  * Some code has been taken from tusb6010.c
   4  * Copyrights for that are attributable to:
   5  * Copyright (C) 2006 Nokia Corporation
   6  * Tony Lindgren <tony@atomide.com>
   7  *
   8  * This file is part of the Inventra Controller Driver for Linux.
   9  *
  10  * The Inventra Controller Driver for Linux is free software; you
  11  * can redistribute it and/or modify it under the terms of the GNU
  12  * General Public License version 2 as published by the Free Software
  13  * Foundation.
  14  *
  15  * The Inventra Controller Driver for Linux is distributed in
  16  * the hope that it will be useful, but WITHOUT ANY WARRANTY;
  17  * without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19  * License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with The Inventra Controller Driver for Linux ; if not,
  23  * write to the Free Software Foundation, Inc., 59 Temple Place,
  24  * Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/io.h>
  33 #include <linux/of.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/pm_runtime.h>
  37 #include <linux/err.h>
  38 #include <linux/delay.h>
  39 #include <linux/usb/musb.h>
  40 #include <linux/phy/omap_control_phy.h>
  41 #include <linux/of_platform.h>
  42
  43 #include "musb_core.h"
  44 #include "omap2430.h"
  45
  46 struct omap2430_glue {
  47         struct device           *dev;
  48         struct platform_device  *musb;
  49         enum musb_vbus_id_status status;
  50         struct work_struct      omap_musb_mailbox_work;
  51         struct device           *control_otghs;
  52 };
  53 #define glue_to_musb(g)         platform_get_drvdata(g->musb)
  54
  55 static struct omap2430_glue     *_glue;
  56
  57 static struct timer_list musb_idle_timer;
  58
  59 static void musb_do_idle(unsigned long _musb)
  60 {
  61         struct musb     *musb = (void *)_musb;
  62         unsigned long   flags;
  63         u8      power;
  64         u8      devctl;
  65
  66         spin_lock_irqsave(&musb->lock, flags);
  67
  68         switch (musb->xceiv->otg->state) {
  69         case OTG_STATE_A_WAIT_BCON:
  70
  71                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  72                 if (devctl & MUSB_DEVCTL_BDEVICE) {
  73                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
  74                         MUSB_DEV_MODE(musb);
  75                 } else {
  76                         musb->xceiv->otg->state = OTG_STATE_A_IDLE;
  77                         MUSB_HST_MODE(musb);
  78                 }
  79                 break;
  80         case OTG_STATE_A_SUSPEND:
  81                 /* finish RESUME signaling? */
  82                 if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
  83                         power = musb_readb(musb->mregs, MUSB_POWER);
  84                         power &= ~MUSB_POWER_RESUME;
  85                         dev_dbg(musb->controller, "root port resume stopped, power %02x\n", power);
  86                         musb_writeb(musb->mregs, MUSB_POWER, power);
  87                         musb->is_active = 1;
  88                         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
  89                                                 | MUSB_PORT_STAT_RESUME);
  90                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
  91                         usb_hcd_poll_rh_status(musb->hcd);
  92                         /* NOTE: it might really be A_WAIT_BCON ... */
  93                         musb->xceiv->otg->state = OTG_STATE_A_HOST;
  94                 }
  95                 break;
  96         case OTG_STATE_A_HOST:
  97                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  98                 if (devctl &  MUSB_DEVCTL_BDEVICE)
  99                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 100                 else
 101                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
 102         default:
 103                 break;
 104         }
 105         spin_unlock_irqrestore(&musb->lock, flags);
 106 }
 107
 108
 109 static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
 110 {
 111         unsigned long           default_timeout = jiffies + msecs_to_jiffies(3);
 112         static unsigned long    last_timer;
 113
 114         if (timeout == 0)
 115                 timeout = default_timeout;
 116
 117         /* Never idle if active, or when VBUS timeout is not set as host */
 118         if (musb->is_active || ((musb->a_wait_bcon == 0)
 119                         && (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON))) {
 120                 dev_dbg(musb->controller, "%s active, deleting timer\n",
 121                         usb_otg_state_string(musb->xceiv->otg->state));
 122                 del_timer(&musb_idle_timer);
 123                 last_timer = jiffies;
 124                 return;
 125         }
 126
 127         if (time_after(last_timer, timeout)) {
 128                 if (!timer_pending(&musb_idle_timer))
 129                         last_timer = timeout;
 130                 else {
 131                         dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n");
 132                         return;
 133                 }
 134         }
 135         last_timer = timeout;
 136
 137         dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n",
 138                 usb_otg_state_string(musb->xceiv->otg->state),
 139                 (unsigned long)jiffies_to_msecs(timeout - jiffies));
 140         mod_timer(&musb_idle_timer, timeout);
 141 }
 142
 143 static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
 144 {
 145         struct usb_otg  *otg = musb->xceiv->otg;
 146         u8              devctl;
 147         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 148         /* HDRC controls CPEN, but beware current surges during device
 149          * connect.  They can trigger transient overcurrent conditions
 150          * that must be ignored.
 151          */
 152
 153         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 154
 155         if (is_on) {
 156                 if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
 157                         int loops = 100;
 158                         /* start the session */
 159                         devctl |= MUSB_DEVCTL_SESSION;
 160                         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 161                         /*
 162                          * Wait for the musb to set as A device to enable the
 163                          * VBUS
 164                          */
 165                         while (musb_readb(musb->mregs, MUSB_DEVCTL) &
 166                                MUSB_DEVCTL_BDEVICE) {
 167
 168                                 mdelay(5);
 169                                 cpu_relax();
 170
 171                                 if (time_after(jiffies, timeout)
 172                                     || loops-- <= 0) {
 173                                         dev_err(musb->controller,
 174                                         "configured as A device timeout");
 175                                         break;
 176                                 }
 177                         }
 178
 179                         otg_set_vbus(otg, 1);
 180                 } else {
 181                         musb->is_active = 1;
 182                         otg->default_a = 1;
 183                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
 184                         devctl |= MUSB_DEVCTL_SESSION;
 185                         MUSB_HST_MODE(musb);
 186                 }
 187         } else {
 188                 musb->is_active = 0;
 189
 190                 /* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
 191                  * jumping right to B_IDLE...
 192                  */
 193
 194                 otg->default_a = 0;
 195                 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 196                 devctl &= ~MUSB_DEVCTL_SESSION;
 197
 198                 MUSB_DEV_MODE(musb);
 199         }
 200         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 201
 202         dev_dbg(musb->controller, "VBUS %s, devctl %02x "
 203                 /* otg %3x conf %08x prcm %08x */ "\n",
 204                 usb_otg_state_string(musb->xceiv->otg->state),
 205                 musb_readb(musb->mregs, MUSB_DEVCTL));
 206 }
 207
 208 static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
 209 {
 210         u8      devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 211
 212         devctl |= MUSB_DEVCTL_SESSION;
 213         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 214
 215         return 0;
 216 }
 217
 218 static inline void omap2430_low_level_exit(struct musb *musb)
 219 {
 220         u32 l;
 221
 222         /* in any role */
 223         l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 224         l |= ENABLEFORCE;       /* enable MSTANDBY */
 225         musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 226 }
 227
 228 static inline void omap2430_low_level_init(struct musb *musb)
 229 {
 230         u32 l;
 231
 232         l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 233         l &= ~ENABLEFORCE;      /* disable MSTANDBY */
 234         musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 235 }
 236
 237 static void omap2430_musb_mailbox(enum musb_vbus_id_status status)
 238 {
 239         struct omap2430_glue    *glue = _glue;
 240
 241         if (!glue) {
 242                 pr_err("%s: musb core is not yet initialized\n", __func__);
 243                 return;
 244         }
 245         glue->status = status;
 246
 247         if (!glue_to_musb(glue)) {
 248                 pr_err("%s: musb core is not yet ready\n", __func__);
 249                 return;
 250         }
 251
 252         schedule_work(&glue->omap_musb_mailbox_work);
 253 }
 254
 255 static void omap_musb_set_mailbox(struct omap2430_glue *glue)
 256 {
 257         struct musb *musb = glue_to_musb(glue);
 258         struct device *dev = musb->controller;
 259         struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
 260         struct omap_musb_board_data *data = pdata->board_data;
 261         struct usb_otg *otg = musb->xceiv->otg;
 262
 263         switch (glue->status) {
 264         case MUSB_ID_GROUND:
 265                 dev_dbg(dev, "ID GND\n");
 266
 267                 otg->default_a = true;
 268                 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
 269                 musb->xceiv->last_event = USB_EVENT_ID;
 270                 if (musb->gadget_driver) {
 271                         pm_runtime_get_sync(dev);
 272                         omap_control_usb_set_mode(glue->control_otghs,
 273                                 USB_MODE_HOST);
 274                         omap2430_musb_set_vbus(musb, 1);
 275                 }
 276                 break;
 277
 278         case MUSB_VBUS_VALID:
 279                 dev_dbg(dev, "VBUS Connect\n");
 280
 281                 otg->default_a = false;
 282                 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 283                 musb->xceiv->last_event = USB_EVENT_VBUS;
 284                 if (musb->gadget_driver)
 285                         pm_runtime_get_sync(dev);
 286                 omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
 287                 break;
 288
 289         case MUSB_ID_FLOAT:
 290         case MUSB_VBUS_OFF:
 291                 dev_dbg(dev, "VBUS Disconnect\n");
 292
 293                 musb->xceiv->last_event = USB_EVENT_NONE;
 294                 if (musb->gadget_driver) {
 295                         omap2430_musb_set_vbus(musb, 0);
 296                         pm_runtime_mark_last_busy(dev);
 297                         pm_runtime_put_autosuspend(dev);
 298                 }
 299
 300                 if (data->interface_type == MUSB_INTERFACE_UTMI)
 301                         otg_set_vbus(musb->xceiv->otg, 0);
 302
 303                 omap_control_usb_set_mode(glue->control_otghs,
 304                         USB_MODE_DISCONNECT);
 305                 break;
 306         default:
 307                 dev_dbg(dev, "ID float\n");
 308         }
 309
 310         atomic_notifier_call_chain(&musb->xceiv->notifier,
 311                         musb->xceiv->last_event, NULL);
 312 }
 313
 314
 315 static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
 316 {
 317         struct omap2430_glue *glue = container_of(mailbox_work,
 318                                 struct omap2430_glue, omap_musb_mailbox_work);
 319         struct musb *musb = glue_to_musb(glue);
 320         struct device *dev = musb->controller;
 321
 322         pm_runtime_get_sync(dev);
 323         omap_musb_set_mailbox(glue);
 324         pm_runtime_mark_last_busy(dev);
 325         pm_runtime_put_autosuspend(dev);
 326 }
 327
 328 static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci)
 329 {
 330         unsigned long   flags;
 331         irqreturn_t     retval = IRQ_NONE;
 332         struct musb     *musb = __hci;
 333
 334         spin_lock_irqsave(&musb->lock, flags);
 335
 336         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 337         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 338         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
 339
 340         if (musb->int_usb || musb->int_tx || musb->int_rx)
 341                 retval = musb_interrupt(musb);
 342
 343         spin_unlock_irqrestore(&musb->lock, flags);
 344
 345         return retval;
 346 }
 347
 348 static int omap2430_musb_init(struct musb *musb)
 349 {
 350         u32 l;
 351         int status = 0;
 352         struct device *dev = musb->controller;
 353         struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 354         struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
 355         struct omap_musb_board_data *data = plat->board_data;
 356
 357         /* We require some kind of external transceiver, hooked
 358          * up through ULPI.  TWL4030-family PMICs include one,
 359          * which needs a driver, drivers aren't always needed.
 360          */
 361         if (dev->parent->of_node) {
 362                 musb->phy = devm_phy_get(dev->parent, "usb2-phy");
 363
 364                 /* We can't totally remove musb->xceiv as of now because
 365                  * musb core uses xceiv.state and xceiv.otg. Once we have
 366                  * a separate state machine to handle otg, these can be moved
 367                  * out of xceiv and then we can start using the generic PHY
 368                  * framework
 369                  */
 370                 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent,
 371                     "usb-phy", 0);
 372         } else {
 373                 musb->xceiv = devm_usb_get_phy_dev(dev, 0);
 374                 musb->phy = devm_phy_get(dev, "usb");
 375         }
 376
 377         if (IS_ERR(musb->xceiv)) {
 378                 status = PTR_ERR(musb->xceiv);
 379
 380                 if (status == -ENXIO)
 381                         return status;
 382
 383                 pr_err("HS USB OTG: no transceiver configured\n");
 384                 return -EPROBE_DEFER;
 385         }
 386
 387         if (IS_ERR(musb->phy)) {
 388                 pr_err("HS USB OTG: no PHY configured\n");
 389                 return PTR_ERR(musb->phy);
 390         }
 391         musb->isr = omap2430_musb_interrupt;
 392
 393         /*
 394          * Enable runtime PM for musb parent (this driver). We can't
 395          * do it earlier as struct musb is not yet allocated and we
 396          * need to touch the musb registers for runtime PM.
 397          */
 398         pm_runtime_enable(glue->dev);
 399         status = pm_runtime_get_sync(glue->dev);
 400         if (status < 0)
 401                 goto err1;
 402
 403         status = pm_runtime_get_sync(dev);
 404         if (status < 0) {
 405                 dev_err(dev, "pm_runtime_get_sync FAILED %d\n", status);
 406                 pm_runtime_put_sync(glue->dev);
 407                 goto err1;
 408         }
 409
 410         l = musb_readl(musb->mregs, OTG_INTERFSEL);
 411
 412         if (data->interface_type == MUSB_INTERFACE_UTMI) {
 413                 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
 414                 l &= ~ULPI_12PIN;       /* Disable ULPI */
 415                 l |= UTMI_8BIT;         /* Enable UTMI  */
 416         } else {
 417                 l |= ULPI_12PIN;
 418         }
 419
 420         musb_writel(musb->mregs, OTG_INTERFSEL, l);
 421
 422         pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
 423                         "sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
 424                         musb_readl(musb->mregs, OTG_REVISION),
 425                         musb_readl(musb->mregs, OTG_SYSCONFIG),
 426                         musb_readl(musb->mregs, OTG_SYSSTATUS),
 427                         musb_readl(musb->mregs, OTG_INTERFSEL),
 428                         musb_readl(musb->mregs, OTG_SIMENABLE));
 429
 430         setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 431
 432         if (glue->status != MUSB_UNKNOWN)
 433                 omap_musb_set_mailbox(glue);
 434
 435         phy_init(musb->phy);
 436         phy_power_on(musb->phy);
 437
 438         pm_runtime_put_noidle(musb->controller);
 439         pm_runtime_put_noidle(glue->dev);
 440         return 0;
 441
 442 err1:
 443         return status;
 444 }
 445
 446 static void omap2430_musb_enable(struct musb *musb)
 447 {
 448         u8              devctl;
 449         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 450         struct device *dev = musb->controller;
 451         struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 452         struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
 453         struct omap_musb_board_data *data = pdata->board_data;
 454
 455         switch (glue->status) {
 456
 457         case MUSB_ID_GROUND:
 458                 omap_control_usb_set_mode(glue->control_otghs, USB_MODE_HOST);
 459                 if (data->interface_type != MUSB_INTERFACE_UTMI)
 460                         break;
 461                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 462                 /* start the session */
 463                 devctl |= MUSB_DEVCTL_SESSION;
 464                 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 465                 while (musb_readb(musb->mregs, MUSB_DEVCTL) &
 466                                 MUSB_DEVCTL_BDEVICE) {
 467                         cpu_relax();
 468
 469                         if (time_after(jiffies, timeout)) {
 470                                 dev_err(dev, "configured as A device timeout");
 471                                 break;
 472                         }
 473                 }
 474                 break;
 475
 476         case MUSB_VBUS_VALID:
 477                 omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
 478                 break;
 479
 480         default:
 481                 break;
 482         }
 483 }
 484
 485 static void omap2430_musb_disable(struct musb *musb)
 486 {
 487         struct device *dev = musb->controller;
 488         struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 489
 490         if (glue->status != MUSB_UNKNOWN)
 491                 omap_control_usb_set_mode(glue->control_otghs,
 492                         USB_MODE_DISCONNECT);
 493 }
 494
 495 static int omap2430_musb_exit(struct musb *musb)
 496 {
 497         del_timer_sync(&musb_idle_timer);
 498
 499         omap2430_low_level_exit(musb);
 500         phy_power_off(musb->phy);
 501         phy_exit(musb->phy);
 502
 503         return 0;
 504 }
 505
 506 static const struct musb_platform_ops omap2430_ops = {
 507         .quirks         = MUSB_DMA_INVENTRA,
 508 #ifdef CONFIG_USB_INVENTRA_DMA
 509         .dma_init       = musbhs_dma_controller_create,
 510         .dma_exit       = musbhs_dma_controller_destroy,
 511 #endif
 512         .init           = omap2430_musb_init,
 513         .exit           = omap2430_musb_exit,
 514
 515         .set_mode       = omap2430_musb_set_mode,
 516         .try_idle       = omap2430_musb_try_idle,
 517
 518         .set_vbus       = omap2430_musb_set_vbus,
 519
 520         .enable         = omap2430_musb_enable,
 521         .disable        = omap2430_musb_disable,
 522
 523         .phy_callback   = omap2430_musb_mailbox,
 524 };
 525
 526 static u64 omap2430_dmamask = DMA_BIT_MASK(32);
 527
 528 static int omap2430_probe(struct platform_device *pdev)
 529 {
 530         struct resource                 musb_resources[3];
 531         struct musb_hdrc_platform_data  *pdata = dev_get_platdata(&pdev->dev);
 532         struct omap_musb_board_data     *data;
 533         struct platform_device          *musb;
 534         struct omap2430_glue            *glue;
 535         struct device_node              *np = pdev->dev.of_node;
 536         struct musb_hdrc_config         *config;
 537         int                             ret = -ENOMEM, val;
 538
 539         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 540         if (!glue)
 541                 goto err0;
 542
 543         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 544         if (!musb) {
 545                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 546                 goto err0;
 547         }
 548
 549         musb->dev.parent                = &pdev->dev;
 550         musb->dev.dma_mask              = &omap2430_dmamask;
 551         musb->dev.coherent_dma_mask     = omap2430_dmamask;
 552
 553         glue->dev                       = &pdev->dev;
 554         glue->musb                      = musb;
 555         glue->status                    = MUSB_UNKNOWN;
 556         glue->control_otghs = ERR_PTR(-ENODEV);
 557
 558         if (np) {
 559                 struct device_node *control_node;
 560                 struct platform_device *control_pdev;
 561
 562                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 563                 if (!pdata)
 564                         goto err2;
 565
 566                 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 567                 if (!data)
 568                         goto err2;
 569
 570                 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
 571                 if (!config)
 572                         goto err2;
 573
 574                 of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
 575                 of_property_read_u32(np, "interface-type",
 576                                                 (u32 *)&data->interface_type);
 577                 of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
 578                 of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
 579                 of_property_read_u32(np, "power", (u32 *)&pdata->power);
 580
 581                 ret = of_property_read_u32(np, "multipoint", &val);
 582                 if (!ret && val)
 583                         config->multipoint = true;
 584
 585                 pdata->board_data       = data;
 586                 pdata->config           = config;
 587
 588                 control_node = of_parse_phandle(np, "ctrl-module", 0);
 589                 if (control_node) {
 590                         control_pdev = of_find_device_by_node(control_node);
 591                         if (!control_pdev) {
 592                                 dev_err(&pdev->dev, "Failed to get control device\n");
 593                                 ret = -EINVAL;
 594                                 goto err2;
 595                         }
 596                         glue->control_otghs = &control_pdev->dev;
 597                 }
 598         }
 599         pdata->platform_ops             = &omap2430_ops;
 600
 601         platform_set_drvdata(pdev, glue);
 602
 603         /*
 604          * REVISIT if we ever have two instances of the wrapper, we will be
 605          * in big trouble
 606          */
 607         _glue   = glue;
 608
 609         INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
 610
 611         memset(musb_resources, 0x00, sizeof(*musb_resources) *
 612                         ARRAY_SIZE(musb_resources));
 613
 614         musb_resources[0].name = pdev->resource[0].name;
 615         musb_resources[0].start = pdev->resource[0].start;
 616         musb_resources[0].end = pdev->resource[0].end;
 617         musb_resources[0].flags = pdev->resource[0].flags;
 618
 619         musb_resources[1].name = pdev->resource[1].name;
 620         musb_resources[1].start = pdev->resource[1].start;
 621         musb_resources[1].end = pdev->resource[1].end;
 622         musb_resources[1].flags = pdev->resource[1].flags;
 623
 624         musb_resources[2].name = pdev->resource[2].name;
 625         musb_resources[2].start = pdev->resource[2].start;
 626         musb_resources[2].end = pdev->resource[2].end;
 627         musb_resources[2].flags = pdev->resource[2].flags;
 628
 629         ret = platform_device_add_resources(musb, musb_resources,
 630                         ARRAY_SIZE(musb_resources));
 631         if (ret) {
 632                 dev_err(&pdev->dev, "failed to add resources\n");
 633                 goto err2;
 634         }
 635
 636         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 637         if (ret) {
 638                 dev_err(&pdev->dev, "failed to add platform_data\n");
 639                 goto err2;
 640         }
 641
 642         /*
 643          * Note that we cannot enable PM runtime yet for this
 644          * driver as we need struct musb initialized first.
 645          * See omap2430_musb_init above.
 646          */
 647
 648         ret = platform_device_add(musb);
 649         if (ret) {
 650                 dev_err(&pdev->dev, "failed to register musb device\n");
 651                 goto err2;
 652         }
 653
 654         return 0;
 655
 656 err2:
 657         platform_device_put(musb);
 658
 659 err0:
 660         return ret;
 661 }
 662
 663 static int omap2430_remove(struct platform_device *pdev)
 664 {
 665         struct omap2430_glue            *glue = platform_get_drvdata(pdev);
 666
 667         pm_runtime_get_sync(glue->dev);
 668         cancel_work_sync(&glue->omap_musb_mailbox_work);
 669         platform_device_unregister(glue->musb);
 670         pm_runtime_put_sync(glue->dev);
 671         pm_runtime_disable(glue->dev);
 672
 673         return 0;
 674 }
 675
 676 #ifdef CONFIG_PM
 677
 678 static int omap2430_runtime_suspend(struct device *dev)
 679 {
 680         struct omap2430_glue            *glue = dev_get_drvdata(dev);
 681         struct musb                     *musb = glue_to_musb(glue);
 682
 683         if (musb) {
 684                 musb->context.otg_interfsel = musb_readl(musb->mregs,
 685                                 OTG_INTERFSEL);
 686
 687                 omap2430_low_level_exit(musb);
 688         }
 689
 690         return 0;
 691 }
 692
 693 static int omap2430_runtime_resume(struct device *dev)
 694 {
 695         struct omap2430_glue            *glue = dev_get_drvdata(dev);
 696         struct musb                     *musb = glue_to_musb(glue);
 697
 698         if (!musb)
 699                 return -EPROBE_DEFER;
 700
 701         omap2430_low_level_init(musb);
 702         musb_writel(musb->mregs, OTG_INTERFSEL,
 703                     musb->context.otg_interfsel);
 704
 705         return 0;
 706 }
 707
 708 static struct dev_pm_ops omap2430_pm_ops = {
 709         .runtime_suspend = omap2430_runtime_suspend,
 710         .runtime_resume = omap2430_runtime_resume,
 711 };
 712
 713 #define DEV_PM_OPS      (&omap2430_pm_ops)
 714 #else
 715 #define DEV_PM_OPS      NULL
 716 #endif
 717
 718 #ifdef CONFIG_OF
 719 static const struct of_device_id omap2430_id_table[] = {
 720         {
 721                 .compatible = "ti,omap4-musb"
 722         },
 723         {
 724                 .compatible = "ti,omap3-musb"
 725         },
 726         {},
 727 };
 728 MODULE_DEVICE_TABLE(of, omap2430_id_table);
 729 #endif
 730
 731 static struct platform_driver omap2430_driver = {
 732         .probe          = omap2430_probe,
 733         .remove         = omap2430_remove,
 734         .driver         = {
 735                 .name   = "musb-omap2430",
 736                 .pm     = DEV_PM_OPS,
 737                 .of_match_table = of_match_ptr(omap2430_id_table),
 738         },
 739 };
 740
 741 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
 742 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 743 MODULE_LICENSE("GPL v2");
 744
 745 static int __init omap2430_init(void)
 746 {
 747         return platform_driver_register(&omap2430_driver);
 748 }
 749 subsys_initcall(omap2430_init);
 750
 751 static void __exit omap2430_exit(void)
 752 {
 753         platform_driver_unregister(&omap2430_driver);
 754 }
 755 module_exit(omap2430_exit);