drivers/usb/host/ohci-lh7a404.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  * Bus Glue for Sharp LH7A404
   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 LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  *
  16  * This file is licenced under the GPL.
  17  */
  18
  19 #include <asm/hardware.h>
  20 #include <asm/mach-types.h>
  21 #include <asm/arch/hardware.h>
  22
  23
  24 extern int usb_disabled(void);
  25
  26 /*-------------------------------------------------------------------------*/
  27
  28 static void lh7a404_start_hc(struct platform_device *dev)
  29 {
  30         printk(KERN_DEBUG __FILE__
  31                ": starting LH7A404 OHCI USB Controller\n");
  32
  33         /*
  34          * Now, carefully enable the USB clock, and take
  35          * the USB host controller out of reset.
  36          */
  37         CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
  38         udelay(1000);
  39         USBH_CMDSTATUS = OHCI_HCR;
  40
  41         printk(KERN_DEBUG __FILE__
  42                    ": Clock to USB host has been enabled \n");
  43 }
  44
  45 static void lh7a404_stop_hc(struct platform_device *dev)
  46 {
  47         printk(KERN_DEBUG __FILE__
  48                ": stopping LH7A404 OHCI USB Controller\n");
  49
  50         CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
  51 }
  52
  53
  54 /*-------------------------------------------------------------------------*/
  55
  56
  57 static irqreturn_t usb_hcd_lh7a404_hcim_irq (int irq, void *__hcd,
  58                                              struct pt_regs * r)
  59 {
  60         struct usb_hcd *hcd = __hcd;
  61
  62         return usb_hcd_irq(irq, hcd, r);
  63 }
  64
  65 /*-------------------------------------------------------------------------*/
  66
  67 void usb_hcd_lh7a404_remove (struct usb_hcd *, struct platform_device *);
  68
  69 /* configure so an HC device and id are always provided */
  70 /* always called with process context; sleeping is OK */
  71
  72
  73 /**
  74  * usb_hcd_lh7a404_probe - initialize LH7A404-based HCDs
  75  * Context: !in_interrupt()
  76  *
  77  * Allocates basic resources for this USB host controller, and
  78  * then invokes the start() method for the HCD associated with it
  79  * through the hotplug entry's driver_data.
  80  *
  81  */
  82 int usb_hcd_lh7a404_probe (const struct hc_driver *driver,
  83                           struct usb_hcd **hcd_out,
  84                           struct platform_device *dev)
  85 {
  86         int retval;
  87         struct usb_hcd *hcd = 0;
  88
  89         unsigned int *addr = NULL;
  90
  91         if (!request_mem_region(dev->resource[0].start,
  92                                 dev->resource[0].end
  93                                 - dev->resource[0].start + 1, hcd_name)) {
  94                 pr_debug("request_mem_region failed");
  95                 return -EBUSY;
  96         }
  97
  98
  99         lh7a404_start_hc(dev);
 100
 101         addr = ioremap(dev->resource[0].start,
 102                        dev->resource[0].end
 103                        - dev->resource[0].start + 1);
 104         if (!addr) {
 105                 pr_debug("ioremap failed");
 106                 retval = -ENOMEM;
 107                 goto err1;
 108         }
 109
 110
 111         hcd = driver->hcd_alloc ();
 112         if (hcd == NULL){
 113                 pr_debug ("hcd_alloc failed");
 114                 retval = -ENOMEM;
 115                 goto err1;
 116         }
 117
 118         if(dev->resource[1].flags != IORESOURCE_IRQ){
 119                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 120                 retval = -ENOMEM;
 121                 goto err1;
 122         }
 123
 124         hcd->driver = (struct hc_driver *) driver;
 125         hcd->description = driver->description;
 126         hcd->irq = dev->resource[1].start;
 127         hcd->regs = addr;
 128         hcd->self.controller = &dev->dev;
 129
 130         retval = hcd_buffer_create (hcd);
 131         if (retval != 0) {
 132                 pr_debug ("pool alloc fail");
 133                 goto err1;
 134         }
 135
 136         retval = request_irq (hcd->irq, usb_hcd_lh7a404_hcim_irq, SA_INTERRUPT,
 137                               hcd->description, hcd);
 138         if (retval != 0) {
 139                 pr_debug("request_irq failed");
 140                 retval = -EBUSY;
 141                 goto err2;
 142         }
 143
 144         pr_debug ("%s (LH7A404) at 0x%p, irq %d",
 145              hcd->description, hcd->regs, hcd->irq);
 146
 147         usb_bus_init (&hcd->self);
 148         hcd->self.op = &usb_hcd_operations;
 149         hcd->self.hcpriv = (void *) hcd;
 150         hcd->self.bus_name = "lh7a404";
 151         hcd->product_desc = "LH7A404 OHCI";
 152
 153         INIT_LIST_HEAD (&hcd->dev_list);
 154
 155         usb_register_bus (&hcd->self);
 156
 157         if ((retval = driver->start (hcd)) < 0)
 158         {
 159                 usb_hcd_lh7a404_remove(hcd, dev);
 160                 return retval;
 161         }
 162
 163         *hcd_out = hcd;
 164         return 0;
 165
 166  err2:
 167         hcd_buffer_destroy (hcd);
 168         if (hcd)
 169                 driver->hcd_free(hcd);
 170  err1:
 171         lh7a404_stop_hc(dev);
 172         release_mem_region(dev->resource[0].start,
 173                                 dev->resource[0].end
 174                            - dev->resource[0].start + 1);
 175         return retval;
 176 }
 177
 178
 179 /* may be called without controller electrically present */
 180 /* may be called with controller, bus, and devices active */
 181
 182 /**
 183  * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
 184  * @dev: USB Host Controller being removed
 185  * Context: !in_interrupt()
 186  *
 187  * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
 188  * the HCD's stop() method.  It is always called from a thread
 189  * context, normally "rmmod", "apmd", or something similar.
 190  *
 191  */
 192 void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
 193 {
 194         void *base;
 195
 196         pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 197
 198         if (in_interrupt ())
 199                 BUG ();
 200
 201         hcd->state = USB_STATE_QUIESCING;
 202
 203         pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name);
 204         usb_disconnect (&hcd->self.root_hub);
 205
 206         hcd->driver->stop (hcd);
 207         hcd->state = USB_STATE_HALT;
 208
 209         free_irq (hcd->irq, hcd);
 210         hcd_buffer_destroy (hcd);
 211
 212         usb_deregister_bus (&hcd->self);
 213
 214         base = hcd->regs;
 215         hcd->driver->hcd_free (hcd);
 216
 217         lh7a404_stop_hc(dev);
 218         release_mem_region(dev->resource[0].start,
 219                            dev->resource[0].end
 220                            - dev->resource[0].start + 1);
 221 }
 222
 223 /*-------------------------------------------------------------------------*/
 224
 225 static int __devinit
 226 ohci_lh7a404_start (struct usb_hcd *hcd)
 227 {
 228         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 229         int             ret;
 230
 231         ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
 232
 233         ohci->hcca = dma_alloc_coherent (hcd->self.controller,
 234                         sizeof *ohci->hcca, &ohci->hcca_dma, 0);
 235         if (!ohci->hcca)
 236                 return -ENOMEM;
 237
 238         ohci_dbg (ohci, "ohci_lh7a404_start, ohci->hcca:%p",
 239                         ohci->hcca);
 240
 241         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 242
 243         if ((ret = ohci_mem_init (ohci)) < 0) {
 244                 ohci_stop (hcd);
 245                 return ret;
 246         }
 247         ohci->regs = hcd->regs;
 248
 249         if (hc_reset (ohci) < 0) {
 250                 ohci_stop (hcd);
 251                 return -ENODEV;
 252         }
 253
 254         if (hc_start (ohci) < 0) {
 255                 err ("can't start %s", ohci->hcd.self.bus_name);
 256                 ohci_stop (hcd);
 257                 return -EBUSY;
 258         }
 259         create_debug_files (ohci);
 260
 261 #ifdef  DEBUG
 262         ohci_dump (ohci, 1);
 263 #endif /*DEBUG*/
 264         return 0;
 265 }
 266
 267 /*-------------------------------------------------------------------------*/
 268
 269 static const struct hc_driver ohci_lh7a404_hc_driver = {
 270         .description =          hcd_name,
 271
 272         /*
 273          * generic hardware linkage
 274          */
 275         .irq =                  ohci_irq,
 276         .flags =                HCD_USB11,
 277
 278         /*
 279          * basic lifecycle operations
 280          */
 281         .start =                ohci_lh7a404_start,
 282 #ifdef  CONFIG_PM
 283         /* suspend:             ohci_lh7a404_suspend,  -- tbd */
 284         /* resume:              ohci_lh7a404_resume,   -- tbd */
 285 #endif /*CONFIG_PM*/
 286         .stop =                 ohci_stop,
 287
 288         /*
 289          * memory lifecycle (except per-request)
 290          */
 291         .hcd_alloc =            ohci_hcd_alloc,
 292         .hcd_free =             ohci_hcd_free,
 293
 294         /*
 295          * managing i/o requests and associated device resources
 296          */
 297         .urb_enqueue =          ohci_urb_enqueue,
 298         .urb_dequeue =          ohci_urb_dequeue,
 299         .endpoint_disable =     ohci_endpoint_disable,
 300
 301         /*
 302          * scheduling support
 303          */
 304         .get_frame_number =     ohci_get_frame,
 305
 306         /*
 307          * root hub support
 308          */
 309         .hub_status_data =      ohci_hub_status_data,
 310         .hub_control =          ohci_hub_control,
 311 };
 312
 313 /*-------------------------------------------------------------------------*/
 314
 315 static int ohci_hcd_lh7a404_drv_probe(struct device *dev)
 316 {
 317         struct platform_device *pdev = to_platform_device(dev);
 318         struct usb_hcd *hcd = NULL;
 319         int ret;
 320
 321         pr_debug ("In ohci_hcd_lh7a404_drv_probe");
 322
 323         if (usb_disabled())
 324                 return -ENODEV;
 325
 326         ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, &hcd, pdev);
 327
 328         if (ret == 0)
 329                 dev_set_drvdata(dev, hcd);
 330
 331         return ret;
 332 }
 333
 334 static int ohci_hcd_lh7a404_drv_remove(struct device *dev)
 335 {
 336         struct platform_device *pdev = to_platform_device(dev);
 337         struct usb_hcd *hcd = dev_get_drvdata(dev);
 338
 339         usb_hcd_lh7a404_remove(hcd, pdev);
 340         dev_set_drvdata(dev, NULL);
 341         return 0;
 342 }
 343         /*TBD*/
 344 /*static int ohci_hcd_lh7a404_drv_suspend(struct device *dev)
 345 {
 346         struct platform_device *pdev = to_platform_device(dev);
 347         struct usb_hcd *hcd = dev_get_drvdata(dev);
 348
 349         return 0;
 350 }
 351 static int ohci_hcd_lh7a404_drv_resume(struct device *dev)
 352 {
 353         struct platform_device *pdev = to_platform_device(dev);
 354         struct usb_hcd *hcd = dev_get_drvdata(dev);
 355
 356
 357         return 0;
 358 }
 359 */
 360
 361 static struct device_driver ohci_hcd_lh7a404_driver = {
 362         .name           = "lh7a404-ohci",
 363         .bus            = &platform_bus_type,
 364         .probe          = ohci_hcd_lh7a404_drv_probe,
 365         .remove         = ohci_hcd_lh7a404_drv_remove,
 366         /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
 367         /*.resume       = ohci_hcd_lh7a404_drv_resume, */
 368 };
 369
 370 static int __init ohci_hcd_lh7a404_init (void)
 371 {
 372         pr_debug (DRIVER_INFO " (LH7A404)");
 373         pr_debug ("block sizes: ed %d td %d\n",
 374                 sizeof (struct ed), sizeof (struct td));
 375
 376         return driver_register(&ohci_hcd_lh7a404_driver);
 377 }
 378
 379 static void __exit ohci_hcd_lh7a404_cleanup (void)
 380 {
 381         driver_unregister(&ohci_hcd_lh7a404_driver);
 382 }
 383
 384 module_init (ohci_hcd_lh7a404_init);
 385 module_exit (ohci_hcd_lh7a404_cleanup);