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 Rusell 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/platform_device.h>
  23 #include <linux/clk.h>
  24
  25 #include <asm/hardware.h>
  26 #include <asm/arch/usb-control.h>
  27
  28 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
  29
  30 /* clock device associated with the hcd */
  31
  32 static struct clk *clk;
  33 static struct clk *usb_clk;
  34
  35 /* forward definitions */
  36
  37 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
  38
  39 /* conversion functions */
  40
  41 static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
  42 {
  43         return hcd->self.controller->platform_data;
  44 }
  45
  46 static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
  47 {
  48         struct s3c2410_hcd_info *info = dev->dev.platform_data;
  49
  50         dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
  51
  52         clk_enable(usb_clk);
  53         mdelay(2);                      /* let the bus clock stabilise */
  54
  55         clk_enable(clk);
  56
  57         if (info != NULL) {
  58                 info->hcd       = hcd;
  59                 info->report_oc = s3c2410_hcd_oc;
  60
  61                 if (info->enable_oc != NULL) {
  62                         (info->enable_oc)(info, 1);
  63                 }
  64         }
  65 }
  66
  67 static void s3c2410_stop_hc(struct platform_device *dev)
  68 {
  69         struct s3c2410_hcd_info *info = dev->dev.platform_data;
  70
  71         dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
  72
  73         if (info != NULL) {
  74                 info->report_oc = NULL;
  75                 info->hcd       = NULL;
  76
  77                 if (info->enable_oc != NULL) {
  78                         (info->enable_oc)(info, 0);
  79                 }
  80         }
  81
  82         clk_disable(clk);
  83         clk_disable(usb_clk);
  84 }
  85
  86 /* ohci_s3c2410_hub_status_data
  87  *
  88  * update the status data from the hub with anything that
  89  * has been detected by our system
  90 */
  91
  92 static int
  93 ohci_s3c2410_hub_status_data (struct usb_hcd *hcd, char *buf)
  94 {
  95         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
  96         struct s3c2410_hcd_port *port;
  97         int orig;
  98         int portno;
  99
 100         orig  = ohci_hub_status_data (hcd, buf);
 101
 102         if (info == NULL)
 103                 return orig;
 104
 105         port = &info->port[0];
 106
 107         /* mark any changed port as changed */
 108
 109         for (portno = 0; portno < 2; port++, portno++) {
 110                 if (port->oc_changed == 1 &&
 111                     port->flags & S3C_HCDFLG_USED) {
 112                         dev_dbg(hcd->self.controller,
 113                                 "oc change on port %d\n", portno);
 114
 115                         if (orig < 1)
 116                                 orig = 1;
 117
 118                         buf[0] |= 1<<(portno+1);
 119                 }
 120         }
 121
 122         return orig;
 123 }
 124
 125 /* s3c2410_usb_set_power
 126  *
 127  * configure the power on a port, by calling the platform device
 128  * routine registered with the platform device
 129 */
 130
 131 static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
 132                                   int port, int to)
 133 {
 134         if (info == NULL)
 135                 return;
 136
 137         if (info->power_control != NULL) {
 138                 info->port[port-1].power = to;
 139                 (info->power_control)(port-1, to);
 140         }
 141 }
 142
 143 /* ohci_s3c2410_hub_control
 144  *
 145  * look at control requests to the hub, and see if we need
 146  * to take any action or over-ride the results from the
 147  * request.
 148 */
 149
 150 static int ohci_s3c2410_hub_control (
 151         struct usb_hcd  *hcd,
 152         u16             typeReq,
 153         u16             wValue,
 154         u16             wIndex,
 155         char            *buf,
 156         u16             wLength)
 157 {
 158         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
 159         struct usb_hub_descriptor *desc;
 160         int ret = -EINVAL;
 161         u32 *data = (u32 *)buf;
 162
 163         dev_dbg(hcd->self.controller,
 164                 "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 165                 hcd, typeReq, wValue, wIndex, buf, wLength);
 166
 167         /* if we are only an humble host without any special capabilities
 168          * process the request straight away and exit */
 169
 170         if (info == NULL) {
 171                 ret = ohci_hub_control(hcd, typeReq, wValue,
 172                                        wIndex, buf, wLength);
 173                 goto out;
 174         }
 175
 176         /* check the request to see if it needs handling */
 177
 178         switch (typeReq) {
 179         case SetPortFeature:
 180                 if (wValue == USB_PORT_FEAT_POWER) {
 181                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 182                         s3c2410_usb_set_power(info, wIndex, 1);
 183                         goto out;
 184                 }
 185                 break;
 186
 187         case ClearPortFeature:
 188                 switch (wValue) {
 189                 case USB_PORT_FEAT_C_OVER_CURRENT:
 190                         dev_dbg(hcd->self.controller,
 191                                 "ClearPortFeature: C_OVER_CURRENT\n");
 192
 193                         if (valid_port(wIndex)) {
 194                                 info->port[wIndex-1].oc_changed = 0;
 195                                 info->port[wIndex-1].oc_status = 0;
 196                         }
 197
 198                         goto out;
 199
 200                 case USB_PORT_FEAT_OVER_CURRENT:
 201                         dev_dbg(hcd->self.controller,
 202                                 "ClearPortFeature: OVER_CURRENT\n");
 203
 204                         if (valid_port(wIndex)) {
 205                                 info->port[wIndex-1].oc_status = 0;
 206                         }
 207
 208                         goto out;
 209
 210                 case USB_PORT_FEAT_POWER:
 211                         dev_dbg(hcd->self.controller,
 212                                 "ClearPortFeature: POWER\n");
 213
 214                         if (valid_port(wIndex)) {
 215                                 s3c2410_usb_set_power(info, wIndex, 0);
 216                                 return 0;
 217                         }
 218                 }
 219                 break;
 220         }
 221
 222         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 223         if (ret)
 224                 goto out;
 225
 226         switch (typeReq) {
 227         case GetHubDescriptor:
 228
 229                 /* update the hub's descriptor */
 230
 231                 desc = (struct usb_hub_descriptor *)buf;
 232
 233                 if (info->power_control == NULL)
 234                         return ret;
 235
 236                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 237                         desc->wHubCharacteristics);
 238
 239                 /* remove the old configurations for power-switching, and
 240                  * over-current protection, and insert our new configuration
 241                  */
 242
 243                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 244                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
 245
 246                 if (info->enable_oc) {
 247                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 248                         desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
 249                 }
 250
 251                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 252                         desc->wHubCharacteristics);
 253
 254                 return ret;
 255
 256         case GetPortStatus:
 257                 /* check port status */
 258
 259                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 260
 261                 if (valid_port(wIndex)) {
 262                         if (info->port[wIndex-1].oc_changed) {
 263                                 *data |= cpu_to_le32(RH_PS_OCIC);
 264                         }
 265
 266                         if (info->port[wIndex-1].oc_status) {
 267                                 *data |= cpu_to_le32(RH_PS_POCI);
 268                         }
 269                 }
 270         }
 271
 272  out:
 273         return ret;
 274 }
 275
 276 /* s3c2410_hcd_oc
 277  *
 278  * handle an over-current report
 279 */
 280
 281 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
 282 {
 283         struct s3c2410_hcd_port *port;
 284         struct usb_hcd *hcd;
 285         unsigned long flags;
 286         int portno;
 287
 288         if (info == NULL)
 289                 return;
 290
 291         port = &info->port[0];
 292         hcd = info->hcd;
 293
 294         local_irq_save(flags);
 295
 296         for (portno = 0; portno < 2; port++, portno++) {
 297                 if (port_oc & (1<<portno) &&
 298                     port->flags & S3C_HCDFLG_USED) {
 299                         port->oc_status = 1;
 300                         port->oc_changed = 1;
 301
 302                         /* ok, once over-current is detected,
 303                            the port needs to be powered down */
 304                         s3c2410_usb_set_power(info, portno+1, 0);
 305                 }
 306         }
 307
 308         local_irq_restore(flags);
 309 }
 310
 311 /* may be called without controller electrically present */
 312 /* may be called with controller, bus, and devices active */
 313
 314 /*
 315  * usb_hcd_s3c2410_remove - shutdown processing for HCD
 316  * @dev: USB Host Controller being removed
 317  * Context: !in_interrupt()
 318  *
 319  * Reverses the effect of usb_hcd_3c2410_probe(), first invoking
 320  * the HCD's stop() method.  It is always called from a thread
 321  * context, normally "rmmod", "apmd", or something similar.
 322  *
 323 */
 324
 325 static void
 326 usb_hcd_s3c2410_remove (struct usb_hcd *hcd, struct platform_device *dev)
 327 {
 328         usb_remove_hcd(hcd);
 329         s3c2410_stop_hc(dev);
 330         iounmap(hcd->regs);
 331         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 332         usb_put_hcd(hcd);
 333 }
 334
 335 /**
 336  * usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
 337  * Context: !in_interrupt()
 338  *
 339  * Allocates basic resources for this USB host controller, and
 340  * then invokes the start() method for the HCD associated with it
 341  * through the hotplug entry's driver_data.
 342  *
 343  */
 344 static int usb_hcd_s3c2410_probe (const struct hc_driver *driver,
 345                                   struct platform_device *dev)
 346 {
 347         struct usb_hcd *hcd = NULL;
 348         int retval;
 349
 350         s3c2410_usb_set_power(dev->dev.platform_data, 1, 1);
 351         s3c2410_usb_set_power(dev->dev.platform_data, 2, 1);
 352
 353         hcd = usb_create_hcd(driver, &dev->dev, "s3c24xx");
 354         if (hcd == NULL)
 355                 return -ENOMEM;
 356
 357         hcd->rsrc_start = dev->resource[0].start;
 358         hcd->rsrc_len   = dev->resource[0].end - dev->resource[0].start + 1;
 359
 360         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 361                 dev_err(&dev->dev, "request_mem_region failed\n");
 362                 retval = -EBUSY;
 363                 goto err_put;
 364         }
 365
 366         clk = clk_get(&dev->dev, "usb-host");
 367         if (IS_ERR(clk)) {
 368                 dev_err(&dev->dev, "cannot get usb-host clock\n");
 369                 retval = -ENOENT;
 370                 goto err_mem;
 371         }
 372
 373         usb_clk = clk_get(&dev->dev, "usb-bus-host");
 374         if (IS_ERR(usb_clk)) {
 375                 dev_err(&dev->dev, "cannot get usb-host clock\n");
 376                 retval = -ENOENT;
 377                 goto err_clk;
 378         }
 379
 380         s3c2410_start_hc(dev, hcd);
 381
 382         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 383         if (!hcd->regs) {
 384                 dev_err(&dev->dev, "ioremap failed\n");
 385                 retval = -ENOMEM;
 386                 goto err_ioremap;
 387         }
 388
 389         ohci_hcd_init(hcd_to_ohci(hcd));
 390
 391         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
 392         if (retval != 0)
 393                 goto err_ioremap;
 394
 395         return 0;
 396
 397  err_ioremap:
 398         s3c2410_stop_hc(dev);
 399         iounmap(hcd->regs);
 400         clk_put(usb_clk);
 401
 402  err_clk:
 403         clk_put(clk);
 404
 405  err_mem:
 406         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 407
 408  err_put:
 409         usb_put_hcd(hcd);
 410         return retval;
 411 }
 412
 413 /*-------------------------------------------------------------------------*/
 414
 415 static int
 416 ohci_s3c2410_start (struct usb_hcd *hcd)
 417 {
 418         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 419         int ret;
 420
 421         if ((ret = ohci_init(ohci)) < 0)
 422                 return ret;
 423
 424         if ((ret = ohci_run (ohci)) < 0) {
 425                 err ("can't start %s", hcd->self.bus_name);
 426                 ohci_stop (hcd);
 427                 return ret;
 428         }
 429
 430         return 0;
 431 }
 432
 433
 434 static const struct hc_driver ohci_s3c2410_hc_driver = {
 435         .description =          hcd_name,
 436         .product_desc =         "S3C24XX OHCI",
 437         .hcd_priv_size =        sizeof(struct ohci_hcd),
 438
 439         /*
 440          * generic hardware linkage
 441          */
 442         .irq =                  ohci_irq,
 443         .flags =                HCD_USB11 | HCD_MEMORY,
 444
 445         /*
 446          * basic lifecycle operations
 447          */
 448         .start =                ohci_s3c2410_start,
 449         .stop =                 ohci_stop,
 450         .shutdown =             ohci_shutdown,
 451
 452         /*
 453          * managing i/o requests and associated device resources
 454          */
 455         .urb_enqueue =          ohci_urb_enqueue,
 456         .urb_dequeue =          ohci_urb_dequeue,
 457         .endpoint_disable =     ohci_endpoint_disable,
 458
 459         /*
 460          * scheduling support
 461          */
 462         .get_frame_number =     ohci_get_frame,
 463
 464         /*
 465          * root hub support
 466          */
 467         .hub_status_data =      ohci_s3c2410_hub_status_data,
 468         .hub_control =          ohci_s3c2410_hub_control,
 469 #ifdef  CONFIG_PM
 470         .bus_suspend =          ohci_bus_suspend,
 471         .bus_resume =           ohci_bus_resume,
 472 #endif
 473         .start_port_reset =     ohci_start_port_reset,
 474 };
 475
 476 /* device driver */
 477
 478 static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
 479 {
 480         return usb_hcd_s3c2410_probe(&ohci_s3c2410_hc_driver, pdev);
 481 }
 482
 483 static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
 484 {
 485         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 486
 487         usb_hcd_s3c2410_remove(hcd, pdev);
 488         return 0;
 489 }
 490
 491 static struct platform_driver ohci_hcd_s3c2410_driver = {
 492         .probe          = ohci_hcd_s3c2410_drv_probe,
 493         .remove         = ohci_hcd_s3c2410_drv_remove,
 494         .shutdown       = usb_hcd_platform_shutdown,
 495         /*.suspend      = ohci_hcd_s3c2410_drv_suspend, */
 496         /*.resume       = ohci_hcd_s3c2410_drv_resume, */
 497         .driver         = {
 498                 .owner  = THIS_MODULE,
 499                 .name   = "s3c2410-ohci",
 500         },
 501 };
 502
 503 MODULE_ALIAS("platform:s3c2410-ohci");