drivers/usb/host/ehci-omap.c

   1 /*
   2  * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
   3  *
   4  * Bus Glue for the EHCI controllers in OMAP3/4
   5  * Tested on several OMAP3 boards, and OMAP4 Pandaboard
   6  *
   7  * Copyright (C) 2007-2011 Texas Instruments, Inc.
   8  *      Author: Vikram Pandita <vikram.pandita@ti.com>
   9  *      Author: Anand Gadiyar <gadiyar@ti.com>
  10  *      Author: Keshava Munegowda <keshava_mgowda@ti.com>
  11  *
  12  * Copyright (C) 2009 Nokia Corporation
  13  *      Contact: Felipe Balbi <felipe.balbi@nokia.com>
  14  *
  15  * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  30  *
  31  * TODO (last updated Feb 27, 2010):
  32  *      - add kernel-doc
  33  *      - enable AUTOIDLE
  34  *      - add suspend/resume
  35  *      - add HSIC and TLL support
  36  *      - convert to use hwmod and runtime PM
  37  */
  38
  39 #include <linux/platform_device.h>
  40 #include <linux/slab.h>
  41 #include <linux/usb/ulpi.h>
  42 #include <plat/usb.h>
  43 #include <linux/regulator/consumer.h>
  44 #include <linux/pm_runtime.h>
  45 #include <linux/gpio.h>
  46 #include <linux/clk.h>
  47
  48 /* EHCI Register Set */
  49 #define EHCI_INSNREG04                                  (0xA0)
  50 #define EHCI_INSNREG04_DISABLE_UNSUSPEND                (1 << 5)
  51 #define EHCI_INSNREG05_ULPI                             (0xA4)
  52 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT               31
  53 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT               24
  54 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT                 22
  55 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT                16
  56 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT             8
  57 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT                0
  58
  59 /* Errata i693 */
  60 static struct clk       *utmi_p1_fck;
  61 static struct clk       *utmi_p2_fck;
  62 static struct clk       *xclk60mhsp1_ck;
  63 static struct clk       *xclk60mhsp2_ck;
  64 static struct clk       *usbhost_p1_fck;
  65 static struct clk       *usbhost_p2_fck;
  66 static struct clk       *init_60m_fclk;
  67
  68 /*-------------------------------------------------------------------------*/
  69
  70 static const struct hc_driver ehci_omap_hc_driver;
  71
  72
  73 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
  74 {
  75         __raw_writel(val, base + reg);
  76 }
  77
  78 static inline u32 ehci_read(void __iomem *base, u32 reg)
  79 {
  80         return __raw_readl(base + reg);
  81 }
  82
  83 /* Erratum i693 workaround sequence */
  84 static void omap_ehci_erratum_i693(struct ehci_hcd *ehci)
  85 {
  86         int ret = 0;
  87
  88         /* Switch to the internal 60 MHz clock */
  89         ret = clk_set_parent(utmi_p1_fck, init_60m_fclk);
  90         if (ret != 0)
  91                 ehci_err(ehci, "init_60m_fclk set parent"
  92                         "failed error:%d\n", ret);
  93
  94         ret = clk_set_parent(utmi_p2_fck, init_60m_fclk);
  95         if (ret != 0)
  96                 ehci_err(ehci, "init_60m_fclk set parent"
  97                         "failed error:%d\n", ret);
  98
  99         clk_enable(usbhost_p1_fck);
 100         clk_enable(usbhost_p2_fck);
 101
 102         /* Wait 1ms and switch back to the external clock */
 103         mdelay(1);
 104         ret = clk_set_parent(utmi_p1_fck, xclk60mhsp1_ck);
 105         if (ret != 0)
 106                 ehci_err(ehci, "xclk60mhsp1_ck set parent"
 107                         "failed error:%d\n", ret);
 108
 109         ret = clk_set_parent(utmi_p2_fck, xclk60mhsp2_ck);
 110         if (ret != 0)
 111                 ehci_err(ehci, "xclk60mhsp2_ck set parent"
 112                         "failed error:%d\n", ret);
 113
 114         clk_disable(usbhost_p1_fck);
 115         clk_disable(usbhost_p2_fck);
 116 }
 117
 118 static void omap_ehci_soft_phy_reset(struct usb_hcd *hcd, u8 port)
 119 {
 120         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 121         unsigned reg = 0;
 122
 123         reg = ULPI_FUNC_CTRL_RESET
 124                 /* FUNCTION_CTRL_SET register */
 125                 | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
 126                 /* Write */
 127                 | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
 128                 /* PORTn */
 129                 | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
 130                 /* start ULPI access*/
 131                 | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
 132
 133         ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
 134
 135         /* Wait for ULPI access completion */
 136         while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
 137                         & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
 138                 cpu_relax();
 139
 140                 if (time_after(jiffies, timeout)) {
 141                         dev_dbg(hcd->self.controller,
 142                                         "phy reset operation timed out\n");
 143                         break;
 144                 }
 145         }
 146 }
 147
 148 static int omap_ehci_init(struct usb_hcd *hcd)
 149 {
 150         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 151         int                     rc;
 152         struct ehci_hcd_omap_platform_data      *pdata;
 153
 154         pdata = hcd->self.controller->platform_data;
 155
 156         /* Hold PHYs in reset while initializing EHCI controller */
 157         if (pdata->phy_reset) {
 158                 if (gpio_is_valid(pdata->reset_gpio_port[0]))
 159                         gpio_set_value_cansleep(pdata->reset_gpio_port[0], 0);
 160
 161                 if (gpio_is_valid(pdata->reset_gpio_port[1]))
 162                         gpio_set_value_cansleep(pdata->reset_gpio_port[1], 0);
 163
 164                 /* Hold the PHY in RESET for enough time till DIR is high */
 165                 udelay(10);
 166         }
 167
 168         /* Soft reset the PHY using PHY reset command over ULPI */
 169         if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
 170                 omap_ehci_soft_phy_reset(hcd, 0);
 171         if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
 172                 omap_ehci_soft_phy_reset(hcd, 1);
 173
 174         /* we know this is the memory we want, no need to ioremap again */
 175         ehci->caps = hcd->regs;
 176
 177         rc = ehci_setup(hcd);
 178
 179         if (pdata->phy_reset) {
 180                 /* Hold the PHY in RESET for enough time till
 181                  * PHY is settled and ready
 182                  */
 183                 udelay(10);
 184
 185                 if (gpio_is_valid(pdata->reset_gpio_port[0]))
 186                         gpio_set_value_cansleep(pdata->reset_gpio_port[0], 1);
 187
 188                 if (gpio_is_valid(pdata->reset_gpio_port[1]))
 189                         gpio_set_value_cansleep(pdata->reset_gpio_port[1], 1);
 190         }
 191
 192         /* root ports should always stay powered */
 193         ehci_port_power(ehci, 1);
 194
 195         return rc;
 196 }
 197
 198 static int omap_ehci_hub_control(
 199         struct usb_hcd  *hcd,
 200         u16             typeReq,
 201         u16             wValue,
 202         u16             wIndex,
 203         char            *buf,
 204         u16             wLength
 205 )
 206 {
 207         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 208         u32 __iomem *status_reg = &ehci->regs->port_status[
 209                                 (wIndex & 0xff) - 1];
 210         u32             temp;
 211         unsigned long   flags;
 212         int             retval = 0;
 213
 214         spin_lock_irqsave(&ehci->lock, flags);
 215
 216         if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 217                 temp = ehci_readl(ehci, status_reg);
 218                 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
 219                         retval = -EPIPE;
 220                         goto done;
 221                 }
 222
 223                 temp &= ~PORT_WKCONN_E;
 224                 temp |= PORT_WKDISC_E | PORT_WKOC_E;
 225                 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 226
 227                 omap_ehci_erratum_i693(ehci);
 228
 229                 set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
 230                 goto done;
 231         }
 232
 233         spin_unlock_irqrestore(&ehci->lock, flags);
 234
 235         /* Handle the hub control events here */
 236         return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 237 done:
 238         spin_unlock_irqrestore(&ehci->lock, flags);
 239         return retval;
 240 }
 241
 242 static void disable_put_regulator(
 243                 struct ehci_hcd_omap_platform_data *pdata)
 244 {
 245         int i;
 246
 247         for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
 248                 if (pdata->regulator[i]) {
 249                         regulator_disable(pdata->regulator[i]);
 250                         regulator_put(pdata->regulator[i]);
 251                 }
 252         }
 253 }
 254
 255 /* configure so an HC device and id are always provided */
 256 /* always called with process context; sleeping is OK */
 257
 258 /**
 259  * ehci_hcd_omap_probe - initialize TI-based HCDs
 260  *
 261  * Allocates basic resources for this USB host controller, and
 262  * then invokes the start() method for the HCD associated with it
 263  * through the hotplug entry's driver_data.
 264  */
 265 static int ehci_hcd_omap_probe(struct platform_device *pdev)
 266 {
 267         struct device                           *dev = &pdev->dev;
 268         struct ehci_hcd_omap_platform_data      *pdata = dev->platform_data;
 269         struct resource                         *res;
 270         struct usb_hcd                          *hcd;
 271         void __iomem                            *regs;
 272         int                                     ret = -ENODEV;
 273         int                                     irq;
 274         int                                     i;
 275         char                                    supply[7];
 276
 277         if (usb_disabled())
 278                 return -ENODEV;
 279
 280         if (!dev->parent) {
 281                 dev_err(dev, "Missing parent device\n");
 282                 return -ENODEV;
 283         }
 284
 285         irq = platform_get_irq_byname(pdev, "ehci-irq");
 286         if (irq < 0) {
 287                 dev_err(dev, "EHCI irq failed\n");
 288                 return -ENODEV;
 289         }
 290
 291         res =  platform_get_resource_byname(pdev,
 292                                 IORESOURCE_MEM, "ehci");
 293         if (!res) {
 294                 dev_err(dev, "UHH EHCI get resource failed\n");
 295                 return -ENODEV;
 296         }
 297
 298         regs = ioremap(res->start, resource_size(res));
 299         if (!regs) {
 300                 dev_err(dev, "UHH EHCI ioremap failed\n");
 301                 return -ENOMEM;
 302         }
 303
 304         hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
 305                         dev_name(dev));
 306         if (!hcd) {
 307                 dev_err(dev, "failed to create hcd with err %d\n", ret);
 308                 ret = -ENOMEM;
 309                 goto err_io;
 310         }
 311
 312         hcd->rsrc_start = res->start;
 313         hcd->rsrc_len = resource_size(res);
 314         hcd->regs = regs;
 315
 316         /* get ehci regulator and enable */
 317         for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
 318                 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
 319                         pdata->regulator[i] = NULL;
 320                         continue;
 321                 }
 322                 snprintf(supply, sizeof(supply), "hsusb%d", i);
 323                 pdata->regulator[i] = regulator_get(dev, supply);
 324                 if (IS_ERR(pdata->regulator[i])) {
 325                         pdata->regulator[i] = NULL;
 326                         dev_dbg(dev,
 327                         "failed to get ehci port%d regulator\n", i);
 328                 } else {
 329                         regulator_enable(pdata->regulator[i]);
 330                 }
 331         }
 332
 333         pm_runtime_enable(dev);
 334         pm_runtime_get_sync(dev);
 335
 336         /*
 337          * An undocumented "feature" in the OMAP3 EHCI controller,
 338          * causes suspended ports to be taken out of suspend when
 339          * the USBCMD.Run/Stop bit is cleared (for example when
 340          * we do ehci_bus_suspend).
 341          * This breaks suspend-resume if the root-hub is allowed
 342          * to suspend. Writing 1 to this undocumented register bit
 343          * disables this feature and restores normal behavior.
 344          */
 345         ehci_write(regs, EHCI_INSNREG04,
 346                                 EHCI_INSNREG04_DISABLE_UNSUSPEND);
 347
 348         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 349         if (ret) {
 350                 dev_err(dev, "failed to add hcd with err %d\n", ret);
 351                 goto err_pm_runtime;
 352         }
 353
 354         /* get clocks */
 355         utmi_p1_fck = clk_get(dev, "utmi_p1_gfclk");
 356         if (IS_ERR(utmi_p1_fck)) {
 357                 ret = PTR_ERR(utmi_p1_fck);
 358                 dev_err(dev, "utmi_p1_gfclk failed error:%d\n", ret);
 359                 goto err_add_hcd;
 360         }
 361
 362         xclk60mhsp1_ck = clk_get(dev, "xclk60mhsp1_ck");
 363         if (IS_ERR(xclk60mhsp1_ck)) {
 364                 ret = PTR_ERR(xclk60mhsp1_ck);
 365                 dev_err(dev, "xclk60mhsp1_ck failed error:%d\n", ret);
 366                 goto err_utmi_p1_fck;
 367         }
 368
 369         utmi_p2_fck = clk_get(dev, "utmi_p2_gfclk");
 370         if (IS_ERR(utmi_p2_fck)) {
 371                 ret = PTR_ERR(utmi_p2_fck);
 372                 dev_err(dev, "utmi_p2_gfclk failed error:%d\n", ret);
 373                 goto err_xclk60mhsp1_ck;
 374         }
 375
 376         xclk60mhsp2_ck = clk_get(dev, "xclk60mhsp2_ck");
 377         if (IS_ERR(xclk60mhsp2_ck)) {
 378                 ret = PTR_ERR(xclk60mhsp2_ck);
 379                 dev_err(dev, "xclk60mhsp2_ck failed error:%d\n", ret);
 380                 goto err_utmi_p2_fck;
 381         }
 382
 383         usbhost_p1_fck = clk_get(dev, "usb_host_hs_utmi_p1_clk");
 384         if (IS_ERR(usbhost_p1_fck)) {
 385                 ret = PTR_ERR(usbhost_p1_fck);
 386                 dev_err(dev, "usbhost_p1_fck failed error:%d\n", ret);
 387                 goto err_xclk60mhsp2_ck;
 388         }
 389
 390         usbhost_p2_fck = clk_get(dev, "usb_host_hs_utmi_p2_clk");
 391         if (IS_ERR(usbhost_p2_fck)) {
 392                 ret = PTR_ERR(usbhost_p2_fck);
 393                 dev_err(dev, "usbhost_p2_fck failed error:%d\n", ret);
 394                 goto err_usbhost_p1_fck;
 395         }
 396
 397         init_60m_fclk = clk_get(dev, "init_60m_fclk");
 398         if (IS_ERR(init_60m_fclk)) {
 399                 ret = PTR_ERR(init_60m_fclk);
 400                 dev_err(dev, "init_60m_fclk failed error:%d\n", ret);
 401                 goto err_usbhost_p2_fck;
 402         }
 403
 404         return 0;
 405
 406 err_usbhost_p2_fck:
 407         clk_put(usbhost_p2_fck);
 408
 409 err_usbhost_p1_fck:
 410         clk_put(usbhost_p1_fck);
 411
 412 err_xclk60mhsp2_ck:
 413         clk_put(xclk60mhsp2_ck);
 414
 415 err_utmi_p2_fck:
 416         clk_put(utmi_p2_fck);
 417
 418 err_xclk60mhsp1_ck:
 419         clk_put(xclk60mhsp1_ck);
 420
 421 err_utmi_p1_fck:
 422         clk_put(utmi_p1_fck);
 423
 424 err_add_hcd:
 425         usb_remove_hcd(hcd);
 426
 427 err_pm_runtime:
 428         disable_put_regulator(pdata);
 429         pm_runtime_put_sync(dev);
 430         usb_put_hcd(hcd);
 431
 432 err_io:
 433         iounmap(regs);
 434         return ret;
 435 }
 436
 437
 438 /**
 439  * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
 440  * @pdev: USB Host Controller being removed
 441  *
 442  * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
 443  * the HCD's stop() method.  It is always called from a thread
 444  * context, normally "rmmod", "apmd", or something similar.
 445  */
 446 static int ehci_hcd_omap_remove(struct platform_device *pdev)
 447 {
 448         struct device *dev                              = &pdev->dev;
 449         struct usb_hcd *hcd                             = dev_get_drvdata(dev);
 450         struct ehci_hcd_omap_platform_data *pdata       = dev->platform_data;
 451
 452         usb_remove_hcd(hcd);
 453         disable_put_regulator(dev->platform_data);
 454         iounmap(hcd->regs);
 455         usb_put_hcd(hcd);
 456
 457         clk_put(utmi_p1_fck);
 458         clk_put(utmi_p2_fck);
 459         clk_put(xclk60mhsp1_ck);
 460         clk_put(xclk60mhsp2_ck);
 461         clk_put(usbhost_p1_fck);
 462         clk_put(usbhost_p2_fck);
 463         clk_put(init_60m_fclk);
 464
 465         pm_runtime_put_sync(dev);
 466         pm_runtime_disable(dev);
 467
 468         if (pdata->phy_reset) {
 469                 if (gpio_is_valid(pdata->reset_gpio_port[0]))
 470                         gpio_free(pdata->reset_gpio_port[0]);
 471
 472                 if (gpio_is_valid(pdata->reset_gpio_port[1]))
 473                         gpio_free(pdata->reset_gpio_port[1]);
 474         }
 475         return 0;
 476 }
 477
 478 static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
 479 {
 480         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 481
 482         if (hcd->driver->shutdown)
 483                 hcd->driver->shutdown(hcd);
 484 }
 485
 486 static struct platform_driver ehci_hcd_omap_driver = {
 487         .probe                  = ehci_hcd_omap_probe,
 488         .remove                 = ehci_hcd_omap_remove,
 489         .shutdown               = ehci_hcd_omap_shutdown,
 490         /*.suspend              = ehci_hcd_omap_suspend, */
 491         /*.resume               = ehci_hcd_omap_resume, */
 492         .driver = {
 493                 .name           = "ehci-omap",
 494         }
 495 };
 496
 497 /*-------------------------------------------------------------------------*/
 498
 499 static const struct hc_driver ehci_omap_hc_driver = {
 500         .description            = hcd_name,
 501         .product_desc           = "OMAP-EHCI Host Controller",
 502         .hcd_priv_size          = sizeof(struct ehci_hcd),
 503
 504         /*
 505          * generic hardware linkage
 506          */
 507         .irq                    = ehci_irq,
 508         .flags                  = HCD_MEMORY | HCD_USB2,
 509
 510         /*
 511          * basic lifecycle operations
 512          */
 513         .reset                  = omap_ehci_init,
 514         .start                  = ehci_run,
 515         .stop                   = ehci_stop,
 516         .shutdown               = ehci_shutdown,
 517
 518         /*
 519          * managing i/o requests and associated device resources
 520          */
 521         .urb_enqueue            = ehci_urb_enqueue,
 522         .urb_dequeue            = ehci_urb_dequeue,
 523         .endpoint_disable       = ehci_endpoint_disable,
 524         .endpoint_reset         = ehci_endpoint_reset,
 525
 526         /*
 527          * scheduling support
 528          */
 529         .get_frame_number       = ehci_get_frame,
 530
 531         /*
 532          * root hub support
 533          */
 534         .hub_status_data        = ehci_hub_status_data,
 535         .hub_control            = omap_ehci_hub_control,
 536         .bus_suspend            = ehci_bus_suspend,
 537         .bus_resume             = ehci_bus_resume,
 538
 539         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 540 };
 541
 542 MODULE_ALIAS("platform:omap-ehci");
 543 MODULE_AUTHOR("Texas Instruments, Inc.");
 544 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
 545