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/platform_device.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/err.h>
  37
  38 #include "musb_core.h"
  39 #include "omap2430.h"
  40
  41 struct omap2430_glue {
  42         struct device           *dev;
  43         struct platform_device  *musb;
  44 };
  45 #define glue_to_musb(g)         platform_get_drvdata(g->musb)
  46
  47 static struct timer_list musb_idle_timer;
  48
  49 static void musb_do_idle(unsigned long _musb)
  50 {
  51         struct musb     *musb = (void *)_musb;
  52         unsigned long   flags;
  53         u8      power;
  54         u8      devctl;
  55
  56         spin_lock_irqsave(&musb->lock, flags);
  57
  58         switch (musb->xceiv->state) {
  59         case OTG_STATE_A_WAIT_BCON:
  60
  61                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  62                 if (devctl & MUSB_DEVCTL_BDEVICE) {
  63                         musb->xceiv->state = OTG_STATE_B_IDLE;
  64                         MUSB_DEV_MODE(musb);
  65                 } else {
  66                         musb->xceiv->state = OTG_STATE_A_IDLE;
  67                         MUSB_HST_MODE(musb);
  68                 }
  69                 break;
  70         case OTG_STATE_A_SUSPEND:
  71                 /* finish RESUME signaling? */
  72                 if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
  73                         power = musb_readb(musb->mregs, MUSB_POWER);
  74                         power &= ~MUSB_POWER_RESUME;
  75                         dev_dbg(musb->controller, "root port resume stopped, power %02x\n", power);
  76                         musb_writeb(musb->mregs, MUSB_POWER, power);
  77                         musb->is_active = 1;
  78                         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
  79                                                 | MUSB_PORT_STAT_RESUME);
  80                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
  81                         usb_hcd_poll_rh_status(musb_to_hcd(musb));
  82                         /* NOTE: it might really be A_WAIT_BCON ... */
  83                         musb->xceiv->state = OTG_STATE_A_HOST;
  84                 }
  85                 break;
  86         case OTG_STATE_A_HOST:
  87                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  88                 if (devctl &  MUSB_DEVCTL_BDEVICE)
  89                         musb->xceiv->state = OTG_STATE_B_IDLE;
  90                 else
  91                         musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
  92         default:
  93                 break;
  94         }
  95         spin_unlock_irqrestore(&musb->lock, flags);
  96 }
  97
  98
  99 static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
 100 {
 101         unsigned long           default_timeout = jiffies + msecs_to_jiffies(3);
 102         static unsigned long    last_timer;
 103
 104         if (timeout == 0)
 105                 timeout = default_timeout;
 106
 107         /* Never idle if active, or when VBUS timeout is not set as host */
 108         if (musb->is_active || ((musb->a_wait_bcon == 0)
 109                         && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
 110                 dev_dbg(musb->controller, "%s active, deleting timer\n",
 111                         otg_state_string(musb->xceiv->state));
 112                 del_timer(&musb_idle_timer);
 113                 last_timer = jiffies;
 114                 return;
 115         }
 116
 117         if (time_after(last_timer, timeout)) {
 118                 if (!timer_pending(&musb_idle_timer))
 119                         last_timer = timeout;
 120                 else {
 121                         dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n");
 122                         return;
 123                 }
 124         }
 125         last_timer = timeout;
 126
 127         dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n",
 128                 otg_state_string(musb->xceiv->state),
 129                 (unsigned long)jiffies_to_msecs(timeout - jiffies));
 130         mod_timer(&musb_idle_timer, timeout);
 131 }
 132
 133 static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
 134 {
 135         struct usb_otg  *otg = musb->xceiv->otg;
 136         u8              devctl;
 137         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 138         int ret = 1;
 139         /* HDRC controls CPEN, but beware current surges during device
 140          * connect.  They can trigger transient overcurrent conditions
 141          * that must be ignored.
 142          */
 143
 144         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 145
 146         if (is_on) {
 147                 if (musb->xceiv->state == OTG_STATE_A_IDLE) {
 148                         /* start the session */
 149                         devctl |= MUSB_DEVCTL_SESSION;
 150                         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 151                         /*
 152                          * Wait for the musb to set as A device to enable the
 153                          * VBUS
 154                          */
 155                         while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
 156
 157                                 cpu_relax();
 158
 159                                 if (time_after(jiffies, timeout)) {
 160                                         dev_err(musb->controller,
 161                                         "configured as A device timeout");
 162                                         ret = -EINVAL;
 163                                         break;
 164                                 }
 165                         }
 166
 167                         if (ret && otg->set_vbus)
 168                                 otg_set_vbus(otg, 1);
 169                 } else {
 170                         musb->is_active = 1;
 171                         otg->default_a = 1;
 172                         musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 173                         devctl |= MUSB_DEVCTL_SESSION;
 174                         MUSB_HST_MODE(musb);
 175                 }
 176         } else {
 177                 musb->is_active = 0;
 178
 179                 /* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
 180                  * jumping right to B_IDLE...
 181                  */
 182
 183                 otg->default_a = 0;
 184                 musb->xceiv->state = OTG_STATE_B_IDLE;
 185                 devctl &= ~MUSB_DEVCTL_SESSION;
 186
 187                 MUSB_DEV_MODE(musb);
 188         }
 189         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 190
 191         dev_dbg(musb->controller, "VBUS %s, devctl %02x "
 192                 /* otg %3x conf %08x prcm %08x */ "\n",
 193                 otg_state_string(musb->xceiv->state),
 194                 musb_readb(musb->mregs, MUSB_DEVCTL));
 195 }
 196
 197 static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
 198 {
 199         u8      devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 200
 201         devctl |= MUSB_DEVCTL_SESSION;
 202         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 203
 204         return 0;
 205 }
 206
 207 static inline void omap2430_low_level_exit(struct musb *musb)
 208 {
 209         u32 l;
 210
 211         /* in any role */
 212         l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 213         l |= ENABLEFORCE;       /* enable MSTANDBY */
 214         musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 215 }
 216
 217 static inline void omap2430_low_level_init(struct musb *musb)
 218 {
 219         u32 l;
 220
 221         l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 222         l &= ~ENABLEFORCE;      /* disable MSTANDBY */
 223         musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 224 }
 225
 226 static int musb_otg_notifications(struct notifier_block *nb,
 227                 unsigned long event, void *unused)
 228 {
 229         struct musb     *musb = container_of(nb, struct musb, nb);
 230
 231         musb->xceiv_event = event;
 232         schedule_work(&musb->otg_notifier_work);
 233
 234         return NOTIFY_OK;
 235 }
 236
 237 static void musb_otg_notifier_work(struct work_struct *data_notifier_work)
 238 {
 239         struct musb *musb = container_of(data_notifier_work, struct musb, otg_notifier_work);
 240         struct device *dev = musb->controller;
 241         struct musb_hdrc_platform_data *pdata = dev->platform_data;
 242         struct omap_musb_board_data *data = pdata->board_data;
 243
 244         switch (musb->xceiv_event) {
 245         case USB_EVENT_ID:
 246                 dev_dbg(musb->controller, "ID GND\n");
 247
 248                 if (!is_otg_enabled(musb) || musb->gadget_driver) {
 249                         pm_runtime_get_sync(musb->controller);
 250                         usb_phy_init(musb->xceiv);
 251                         omap2430_musb_set_vbus(musb, 1);
 252                 }
 253                 break;
 254
 255         case USB_EVENT_VBUS:
 256                 dev_dbg(musb->controller, "VBUS Connect\n");
 257
 258                 if (musb->gadget_driver)
 259                         pm_runtime_get_sync(musb->controller);
 260                 usb_phy_init(musb->xceiv);
 261                 break;
 262
 263         case USB_EVENT_NONE:
 264                 dev_dbg(musb->controller, "VBUS Disconnect\n");
 265
 266                 if (is_otg_enabled(musb) || is_peripheral_enabled(musb))
 267                         if (musb->gadget_driver) {
 268                                 pm_runtime_mark_last_busy(musb->controller);
 269                                 pm_runtime_put_autosuspend(musb->controller);
 270                         }
 271
 272                 if (data->interface_type == MUSB_INTERFACE_UTMI) {
 273                         if (musb->xceiv->otg->set_vbus)
 274                                 otg_set_vbus(musb->xceiv->otg, 0);
 275                 }
 276                 usb_phy_shutdown(musb->xceiv);
 277                 break;
 278         default:
 279                 dev_dbg(musb->controller, "ID float\n");
 280         }
 281 }
 282
 283 static int omap2430_musb_init(struct musb *musb)
 284 {
 285         u32 l;
 286         int status = 0;
 287         struct device *dev = musb->controller;
 288         struct musb_hdrc_platform_data *plat = dev->platform_data;
 289         struct omap_musb_board_data *data = plat->board_data;
 290
 291         /* We require some kind of external transceiver, hooked
 292          * up through ULPI.  TWL4030-family PMICs include one,
 293          * which needs a driver, drivers aren't always needed.
 294          */
 295         musb->xceiv = usb_get_transceiver();
 296         if (!musb->xceiv) {
 297                 pr_err("HS USB OTG: no transceiver configured\n");
 298                 return -ENODEV;
 299         }
 300
 301         INIT_WORK(&musb->otg_notifier_work, musb_otg_notifier_work);
 302
 303         status = pm_runtime_get_sync(dev);
 304         if (status < 0) {
 305                 dev_err(dev, "pm_runtime_get_sync FAILED %d\n", status);
 306                 goto err1;
 307         }
 308
 309         l = musb_readl(musb->mregs, OTG_INTERFSEL);
 310
 311         if (data->interface_type == MUSB_INTERFACE_UTMI) {
 312                 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
 313                 l &= ~ULPI_12PIN;       /* Disable ULPI */
 314                 l |= UTMI_8BIT;         /* Enable UTMI  */
 315         } else {
 316                 l |= ULPI_12PIN;
 317         }
 318
 319         musb_writel(musb->mregs, OTG_INTERFSEL, l);
 320
 321         pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
 322                         "sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
 323                         musb_readl(musb->mregs, OTG_REVISION),
 324                         musb_readl(musb->mregs, OTG_SYSCONFIG),
 325                         musb_readl(musb->mregs, OTG_SYSSTATUS),
 326                         musb_readl(musb->mregs, OTG_INTERFSEL),
 327                         musb_readl(musb->mregs, OTG_SIMENABLE));
 328
 329         musb->nb.notifier_call = musb_otg_notifications;
 330         status = usb_register_notifier(musb->xceiv, &musb->nb);
 331
 332         if (status)
 333                 dev_dbg(musb->controller, "notification register failed\n");
 334
 335         setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 336
 337         pm_runtime_put_noidle(musb->controller);
 338         return 0;
 339
 340 err1:
 341         return status;
 342 }
 343
 344 static void omap2430_musb_enable(struct musb *musb)
 345 {
 346         u8              devctl;
 347         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 348         struct device *dev = musb->controller;
 349         struct musb_hdrc_platform_data *pdata = dev->platform_data;
 350         struct omap_musb_board_data *data = pdata->board_data;
 351
 352         switch (musb->xceiv->last_event) {
 353
 354         case USB_EVENT_ID:
 355                 usb_phy_init(musb->xceiv);
 356                 if (data->interface_type != MUSB_INTERFACE_UTMI)
 357                         break;
 358                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 359                 /* start the session */
 360                 devctl |= MUSB_DEVCTL_SESSION;
 361                 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 362                 while (musb_readb(musb->mregs, MUSB_DEVCTL) &
 363                                 MUSB_DEVCTL_BDEVICE) {
 364                         cpu_relax();
 365
 366                         if (time_after(jiffies, timeout)) {
 367                                 dev_err(dev, "configured as A device timeout");
 368                                 break;
 369                         }
 370                 }
 371                 break;
 372
 373         case USB_EVENT_VBUS:
 374                 usb_phy_init(musb->xceiv);
 375                 break;
 376
 377         default:
 378                 break;
 379         }
 380 }
 381
 382 static void omap2430_musb_disable(struct musb *musb)
 383 {
 384         if (musb->xceiv->last_event)
 385                 usb_phy_shutdown(musb->xceiv);
 386 }
 387
 388 static int omap2430_musb_exit(struct musb *musb)
 389 {
 390         del_timer_sync(&musb_idle_timer);
 391         cancel_work_sync(&musb->otg_notifier_work);
 392
 393         omap2430_low_level_exit(musb);
 394         usb_put_transceiver(musb->xceiv);
 395
 396         return 0;
 397 }
 398
 399 static const struct musb_platform_ops omap2430_ops = {
 400         .init           = omap2430_musb_init,
 401         .exit           = omap2430_musb_exit,
 402
 403         .set_mode       = omap2430_musb_set_mode,
 404         .try_idle       = omap2430_musb_try_idle,
 405
 406         .set_vbus       = omap2430_musb_set_vbus,
 407
 408         .enable         = omap2430_musb_enable,
 409         .disable        = omap2430_musb_disable,
 410 };
 411
 412 static u64 omap2430_dmamask = DMA_BIT_MASK(32);
 413
 414 static int __devinit omap2430_probe(struct platform_device *pdev)
 415 {
 416         struct musb_hdrc_platform_data  *pdata = pdev->dev.platform_data;
 417         struct platform_device          *musb;
 418         struct omap2430_glue            *glue;
 419         int                             ret = -ENOMEM;
 420
 421         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 422         if (!glue) {
 423                 dev_err(&pdev->dev, "failed to allocate glue context\n");
 424                 goto err0;
 425         }
 426
 427         musb = platform_device_alloc("musb-hdrc", -1);
 428         if (!musb) {
 429                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 430                 goto err1;
 431         }
 432
 433         musb->dev.parent                = &pdev->dev;
 434         musb->dev.dma_mask              = &omap2430_dmamask;
 435         musb->dev.coherent_dma_mask     = omap2430_dmamask;
 436
 437         glue->dev                       = &pdev->dev;
 438         glue->musb                      = musb;
 439
 440         pdata->platform_ops             = &omap2430_ops;
 441
 442         platform_set_drvdata(pdev, glue);
 443
 444         ret = platform_device_add_resources(musb, pdev->resource,
 445                         pdev->num_resources);
 446         if (ret) {
 447                 dev_err(&pdev->dev, "failed to add resources\n");
 448                 goto err2;
 449         }
 450
 451         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 452         if (ret) {
 453                 dev_err(&pdev->dev, "failed to add platform_data\n");
 454                 goto err2;
 455         }
 456
 457         pm_runtime_enable(&pdev->dev);
 458
 459         ret = platform_device_add(musb);
 460         if (ret) {
 461                 dev_err(&pdev->dev, "failed to register musb device\n");
 462                 goto err2;
 463         }
 464
 465         return 0;
 466
 467 err2:
 468         platform_device_put(musb);
 469
 470 err1:
 471         kfree(glue);
 472
 473 err0:
 474         return ret;
 475 }
 476
 477 static int __devexit omap2430_remove(struct platform_device *pdev)
 478 {
 479         struct omap2430_glue            *glue = platform_get_drvdata(pdev);
 480
 481         platform_device_del(glue->musb);
 482         platform_device_put(glue->musb);
 483         kfree(glue);
 484
 485         return 0;
 486 }
 487
 488 #ifdef CONFIG_PM
 489
 490 static int omap2430_runtime_suspend(struct device *dev)
 491 {
 492         struct omap2430_glue            *glue = dev_get_drvdata(dev);
 493         struct musb                     *musb = glue_to_musb(glue);
 494
 495         if (musb) {
 496                 musb->context.otg_interfsel = musb_readl(musb->mregs,
 497                                 OTG_INTERFSEL);
 498
 499                 omap2430_low_level_exit(musb);
 500                 usb_phy_set_suspend(musb->xceiv, 1);
 501         }
 502
 503         return 0;
 504 }
 505
 506 static int omap2430_runtime_resume(struct device *dev)
 507 {
 508         struct omap2430_glue            *glue = dev_get_drvdata(dev);
 509         struct musb                     *musb = glue_to_musb(glue);
 510
 511         if (musb) {
 512                 omap2430_low_level_init(musb);
 513                 musb_writel(musb->mregs, OTG_INTERFSEL,
 514                                 musb->context.otg_interfsel);
 515
 516                 usb_phy_set_suspend(musb->xceiv, 0);
 517         }
 518
 519         return 0;
 520 }
 521
 522 static struct dev_pm_ops omap2430_pm_ops = {
 523         .runtime_suspend = omap2430_runtime_suspend,
 524         .runtime_resume = omap2430_runtime_resume,
 525 };
 526
 527 #define DEV_PM_OPS      (&omap2430_pm_ops)
 528 #else
 529 #define DEV_PM_OPS      NULL
 530 #endif
 531
 532 static struct platform_driver omap2430_driver = {
 533         .probe          = omap2430_probe,
 534         .remove         = __devexit_p(omap2430_remove),
 535         .driver         = {
 536                 .name   = "musb-omap2430",
 537                 .pm     = DEV_PM_OPS,
 538         },
 539 };
 540
 541 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
 542 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 543 MODULE_LICENSE("GPL v2");
 544
 545 static int __init omap2430_init(void)
 546 {
 547         return platform_driver_register(&omap2430_driver);
 548 }
 549 module_init(omap2430_init);
 550
 551 static void __exit omap2430_exit(void)
 552 {
 553         platform_driver_unregister(&omap2430_driver);
 554 }
 555 module_exit(omap2430_exit);