drivers/usb/host/ohci-s3c2410.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * USB Bus Glue for Samsung S3C2410
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
  14  *      by Ben Dooks, <ben@simtec.co.uk>
  15  *      Copyright (C) 2004 Simtec Electronics
  16  *
  17  * Thanks to basprog@mail.ru for updates to newer kernels
  18  *
  19  * This file is licenced under the GPL.
  20 */
  21
  22 #include <linux/clk.h>
  23 #include <linux/io.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/platform_data/usb-ohci-s3c2410.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/hcd.h>
  30
  31 #include "ohci.h"
  32
  33
  34 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
  35
  36 /* clock device associated with the hcd */
  37
  38
  39 #define DRIVER_DESC "OHCI S3C2410 driver"
  40
  41 static const char hcd_name[] = "ohci-s3c2410";
  42
  43 static struct clk *clk;
  44 static struct clk *usb_clk;
  45
  46 /* forward definitions */
  47
  48 static int (*orig_ohci_hub_control)(struct usb_hcd  *hcd, u16 typeReq,
  49                         u16 wValue, u16 wIndex, char *buf, u16 wLength);
  50 static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
  51
  52 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
  53
  54 /* conversion functions */
  55
  56 static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
  57 {
  58         return dev_get_platdata(hcd->self.controller);
  59 }
  60
  61 static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
  62 {
  63         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
  64
  65         dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
  66
  67         clk_prepare_enable(usb_clk);
  68         mdelay(2);                      /* let the bus clock stabilise */
  69
  70         clk_prepare_enable(clk);
  71
  72         if (info != NULL) {
  73                 info->hcd       = hcd;
  74                 info->report_oc = s3c2410_hcd_oc;
  75
  76                 if (info->enable_oc != NULL)
  77                         (info->enable_oc)(info, 1);
  78         }
  79 }
  80
  81 static void s3c2410_stop_hc(struct platform_device *dev)
  82 {
  83         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
  84
  85         dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
  86
  87         if (info != NULL) {
  88                 info->report_oc = NULL;
  89                 info->hcd       = NULL;
  90
  91                 if (info->enable_oc != NULL)
  92                         (info->enable_oc)(info, 0);
  93         }
  94
  95         clk_disable_unprepare(clk);
  96         clk_disable_unprepare(usb_clk);
  97 }
  98
  99 /* ohci_s3c2410_hub_status_data
 100  *
 101  * update the status data from the hub with anything that
 102  * has been detected by our system
 103 */
 104
 105 static int
 106 ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
 107 {
 108         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
 109         struct s3c2410_hcd_port *port;
 110         int orig;
 111         int portno;
 112
 113         orig = orig_ohci_hub_status_data(hcd, buf);
 114
 115         if (info == NULL)
 116                 return orig;
 117
 118         port = &info->port[0];
 119
 120         /* mark any changed port as changed */
 121
 122         for (portno = 0; portno < 2; port++, portno++) {
 123                 if (port->oc_changed == 1 &&
 124                     port->flags & S3C_HCDFLG_USED) {
 125                         dev_dbg(hcd->self.controller,
 126                                 "oc change on port %d\n", portno);
 127
 128                         if (orig < 1)
 129                                 orig = 1;
 130
 131                         buf[0] |= 1<<(portno+1);
 132                 }
 133         }
 134
 135         return orig;
 136 }
 137
 138 /* s3c2410_usb_set_power
 139  *
 140  * configure the power on a port, by calling the platform device
 141  * routine registered with the platform device
 142 */
 143
 144 static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
 145                                   int port, int to)
 146 {
 147         if (info == NULL)
 148                 return;
 149
 150         if (info->power_control != NULL) {
 151                 info->port[port-1].power = to;
 152                 (info->power_control)(port-1, to);
 153         }
 154 }
 155
 156 /* ohci_s3c2410_hub_control
 157  *
 158  * look at control requests to the hub, and see if we need
 159  * to take any action or over-ride the results from the
 160  * request.
 161 */
 162
 163 static int ohci_s3c2410_hub_control(
 164         struct usb_hcd  *hcd,
 165         u16             typeReq,
 166         u16             wValue,
 167         u16             wIndex,
 168         char            *buf,
 169         u16             wLength)
 170 {
 171         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
 172         struct usb_hub_descriptor *desc;
 173         int ret = -EINVAL;
 174         u32 *data = (u32 *)buf;
 175
 176         dev_dbg(hcd->self.controller,
 177                 "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 178                 hcd, typeReq, wValue, wIndex, buf, wLength);
 179
 180         /* if we are only an humble host without any special capabilities
 181          * process the request straight away and exit */
 182
 183         if (info == NULL) {
 184                 ret = orig_ohci_hub_control(hcd, typeReq, wValue,
 185                                        wIndex, buf, wLength);
 186                 goto out;
 187         }
 188
 189         /* check the request to see if it needs handling */
 190
 191         switch (typeReq) {
 192         case SetPortFeature:
 193                 if (wValue == USB_PORT_FEAT_POWER) {
 194                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 195                         s3c2410_usb_set_power(info, wIndex, 1);
 196                         goto out;
 197                 }
 198                 break;
 199
 200         case ClearPortFeature:
 201                 switch (wValue) {
 202                 case USB_PORT_FEAT_C_OVER_CURRENT:
 203                         dev_dbg(hcd->self.controller,
 204                                 "ClearPortFeature: C_OVER_CURRENT\n");
 205
 206                         if (valid_port(wIndex)) {
 207                                 info->port[wIndex-1].oc_changed = 0;
 208                                 info->port[wIndex-1].oc_status = 0;
 209                         }
 210
 211                         goto out;
 212
 213                 case USB_PORT_FEAT_OVER_CURRENT:
 214                         dev_dbg(hcd->self.controller,
 215                                 "ClearPortFeature: OVER_CURRENT\n");
 216
 217                         if (valid_port(wIndex))
 218                                 info->port[wIndex-1].oc_status = 0;
 219
 220                         goto out;
 221
 222                 case USB_PORT_FEAT_POWER:
 223                         dev_dbg(hcd->self.controller,
 224                                 "ClearPortFeature: POWER\n");
 225
 226                         if (valid_port(wIndex)) {
 227                                 s3c2410_usb_set_power(info, wIndex, 0);
 228                                 return 0;
 229                         }
 230                 }
 231                 break;
 232         }
 233
 234         ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 235         if (ret)
 236                 goto out;
 237
 238         switch (typeReq) {
 239         case GetHubDescriptor:
 240
 241                 /* update the hub's descriptor */
 242
 243                 desc = (struct usb_hub_descriptor *)buf;
 244
 245                 if (info->power_control == NULL)
 246                         return ret;
 247
 248                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 249                         desc->wHubCharacteristics);
 250
 251                 /* remove the old configurations for power-switching, and
 252                  * over-current protection, and insert our new configuration
 253                  */
 254
 255                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 256                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
 257
 258                 if (info->enable_oc) {
 259                         desc->wHubCharacteristics &= ~cpu_to_le16(
 260                                 HUB_CHAR_OCPM);
 261                         desc->wHubCharacteristics |=  cpu_to_le16(
 262                                 0x0008 |
 263                                 0x0001);
 264                 }
 265
 266                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 267                         desc->wHubCharacteristics);
 268
 269                 return ret;
 270
 271         case GetPortStatus:
 272                 /* check port status */
 273
 274                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 275
 276                 if (valid_port(wIndex)) {
 277                         if (info->port[wIndex-1].oc_changed)
 278                                 *data |= cpu_to_le32(RH_PS_OCIC);
 279
 280                         if (info->port[wIndex-1].oc_status)
 281                                 *data |= cpu_to_le32(RH_PS_POCI);
 282                 }
 283         }
 284
 285  out:
 286         return ret;
 287 }
 288
 289 /* s3c2410_hcd_oc
 290  *
 291  * handle an over-current report
 292 */
 293
 294 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
 295 {
 296         struct s3c2410_hcd_port *port;
 297         struct usb_hcd *hcd;
 298         unsigned long flags;
 299         int portno;
 300
 301         if (info == NULL)
 302                 return;
 303
 304         port = &info->port[0];
 305         hcd = info->hcd;
 306
 307         local_irq_save(flags);
 308
 309         for (portno = 0; portno < 2; port++, portno++) {
 310                 if (port_oc & (1<<portno) &&
 311                     port->flags & S3C_HCDFLG_USED) {
 312                         port->oc_status = 1;
 313                         port->oc_changed = 1;
 314
 315                         /* ok, once over-current is detected,
 316                            the port needs to be powered down */
 317                         s3c2410_usb_set_power(info, portno+1, 0);
 318                 }
 319         }
 320
 321         local_irq_restore(flags);
 322 }
 323
 324 /* may be called without controller electrically present */
 325 /* may be called with controller, bus, and devices active */
 326
 327 /*
 328  * usb_hcd_s3c2410_remove - shutdown processing for HCD
 329  * @dev: USB Host Controller being removed
 330  * Context: !in_interrupt()
 331  *
 332  * Reverses the effect of usb_hcd_3c2410_probe(), first invoking
 333  * the HCD's stop() method.  It is always called from a thread
 334  * context, normally "rmmod", "apmd", or something similar.
 335  *
 336 */
 337
 338 static void
 339 usb_hcd_s3c2410_remove(struct usb_hcd *hcd, struct platform_device *dev)
 340 {
 341         usb_remove_hcd(hcd);
 342         s3c2410_stop_hc(dev);
 343         usb_put_hcd(hcd);
 344 }
 345
 346 /**
 347  * usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
 348  * Context: !in_interrupt()
 349  *
 350  * Allocates basic resources for this USB host controller, and
 351  * then invokes the start() method for the HCD associated with it
 352  * through the hotplug entry's driver_data.
 353  *
 354  */
 355 static int usb_hcd_s3c2410_probe(const struct hc_driver *driver,
 356                                   struct platform_device *dev)
 357 {
 358         struct usb_hcd *hcd = NULL;
 359         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 360         int retval;
 361
 362         s3c2410_usb_set_power(info, 1, 1);
 363         s3c2410_usb_set_power(info, 2, 1);
 364
 365         hcd = usb_create_hcd(driver, &dev->dev, "s3c24xx");
 366         if (hcd == NULL)
 367                 return -ENOMEM;
 368
 369         hcd->rsrc_start = dev->resource[0].start;
 370         hcd->rsrc_len   = resource_size(&dev->resource[0]);
 371
 372         hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
 373         if (IS_ERR(hcd->regs)) {
 374                 retval = PTR_ERR(hcd->regs);
 375                 goto err_put;
 376         }
 377
 378         clk = devm_clk_get(&dev->dev, "usb-host");
 379         if (IS_ERR(clk)) {
 380                 dev_err(&dev->dev, "cannot get usb-host clock\n");
 381                 retval = PTR_ERR(clk);
 382                 goto err_put;
 383         }
 384
 385         usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
 386         if (IS_ERR(usb_clk)) {
 387                 dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
 388                 retval = PTR_ERR(usb_clk);
 389                 goto err_put;
 390         }
 391
 392         s3c2410_start_hc(dev, hcd);
 393
 394         retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
 395         if (retval != 0)
 396                 goto err_ioremap;
 397
 398         return 0;
 399
 400  err_ioremap:
 401         s3c2410_stop_hc(dev);
 402
 403  err_put:
 404         usb_put_hcd(hcd);
 405         return retval;
 406 }
 407
 408 /*-------------------------------------------------------------------------*/
 409
 410 static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
 411
 412 static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
 413 {
 414         return usb_hcd_s3c2410_probe(&ohci_s3c2410_hc_driver, pdev);
 415 }
 416
 417 static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
 418 {
 419         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 420
 421         usb_hcd_s3c2410_remove(hcd, pdev);
 422         return 0;
 423 }
 424
 425 #ifdef CONFIG_PM
 426 static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
 427 {
 428         struct usb_hcd *hcd = dev_get_drvdata(dev);
 429         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 430         struct platform_device *pdev = to_platform_device(dev);
 431         unsigned long flags;
 432         int rc = 0;
 433
 434         /*
 435          * Root hub was already suspended. Disable irq emission and
 436          * mark HW unaccessible, bail out if RH has been resumed. Use
 437          * the spinlock to properly synchronize with possible pending
 438          * RH suspend or resume activity.
 439          */
 440         spin_lock_irqsave(&ohci->lock, flags);
 441         if (ohci->rh_state != OHCI_RH_SUSPENDED) {
 442                 rc = -EINVAL;
 443                 goto bail;
 444         }
 445
 446         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 447
 448         s3c2410_stop_hc(pdev);
 449 bail:
 450         spin_unlock_irqrestore(&ohci->lock, flags);
 451
 452         return rc;
 453 }
 454
 455 static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
 456 {
 457         struct usb_hcd *hcd = dev_get_drvdata(dev);
 458         struct platform_device *pdev = to_platform_device(dev);
 459
 460         s3c2410_start_hc(pdev, hcd);
 461
 462         ohci_resume(hcd, false);
 463
 464         return 0;
 465 }
 466 #else
 467 #define ohci_hcd_s3c2410_drv_suspend    NULL
 468 #define ohci_hcd_s3c2410_drv_resume     NULL
 469 #endif
 470
 471 static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
 472         .suspend        = ohci_hcd_s3c2410_drv_suspend,
 473         .resume         = ohci_hcd_s3c2410_drv_resume,
 474 };
 475
 476 static struct platform_driver ohci_hcd_s3c2410_driver = {
 477         .probe          = ohci_hcd_s3c2410_drv_probe,
 478         .remove         = ohci_hcd_s3c2410_drv_remove,
 479         .shutdown       = usb_hcd_platform_shutdown,
 480         .driver         = {
 481                 .owner  = THIS_MODULE,
 482                 .name   = "s3c2410-ohci",
 483                 .pm     = &ohci_hcd_s3c2410_pm_ops,
 484         },
 485 };
 486
 487 static int __init ohci_s3c2410_init(void)
 488 {
 489         if (usb_disabled())
 490                 return -ENODEV;
 491
 492         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 493         ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
 494
 495         /*
 496          * The Samsung HW has some unusual quirks, which require
 497          * Sumsung-specific workarounds. We override certain hc_driver
 498          * functions here to achieve that. We explicitly do not enhance
 499          * ohci_driver_overrides to allow this more easily, since this
 500          * is an unusual case, and we don't want to encourage others to
 501          * override these functions by making it too easy.
 502          */
 503
 504         orig_ohci_hub_control = ohci_s3c2410_hc_driver.hub_control;
 505         orig_ohci_hub_status_data = ohci_s3c2410_hc_driver.hub_status_data;
 506
 507         ohci_s3c2410_hc_driver.hub_status_data  = ohci_s3c2410_hub_status_data;
 508         ohci_s3c2410_hc_driver.hub_control      = ohci_s3c2410_hub_control;
 509
 510         return platform_driver_register(&ohci_hcd_s3c2410_driver);
 511 }
 512 module_init(ohci_s3c2410_init);
 513
 514 static void __exit ohci_s3c2410_cleanup(void)
 515 {
 516         platform_driver_unregister(&ohci_hcd_s3c2410_driver);
 517 }
 518 module_exit(ohci_s3c2410_cleanup);
 519
 520 MODULE_DESCRIPTION(DRIVER_DESC);
 521 MODULE_LICENSE("GPL");
 522 MODULE_ALIAS("platform:s3c2410-ohci");