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.release = &usb_hcd_release;
 150         hcd->self.hcpriv = (void *) hcd;
 151         hcd->self.bus_name = "lh7a404";
 152         hcd->product_desc = "LH7A404 OHCI";
 153
 154         INIT_LIST_HEAD (&hcd->dev_list);
 155
 156         usb_register_bus (&hcd->self);
 157
 158         if ((retval = driver->start (hcd)) < 0)
 159         {
 160                 usb_hcd_lh7a404_remove(hcd, dev);
 161                 return retval;
 162         }
 163
 164         *hcd_out = hcd;
 165         return 0;
 166
 167  err2:
 168         hcd_buffer_destroy (hcd);
 169  err1:
 170         kfree(hcd);
 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         pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 195
 196         if (in_interrupt ())
 197                 BUG ();
 198
 199         hcd->state = USB_STATE_QUIESCING;
 200
 201         pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name);
 202         usb_disconnect (&hcd->self.root_hub);
 203
 204         hcd->driver->stop (hcd);
 205         hcd->state = USB_STATE_HALT;
 206
 207         free_irq (hcd->irq, hcd);
 208         hcd_buffer_destroy (hcd);
 209
 210         usb_deregister_bus (&hcd->self);
 211
 212         lh7a404_stop_hc(dev);
 213         release_mem_region(dev->resource[0].start,
 214                            dev->resource[0].end
 215                            - dev->resource[0].start + 1);
 216 }
 217
 218 /*-------------------------------------------------------------------------*/
 219
 220 static int __devinit
 221 ohci_lh7a404_start (struct usb_hcd *hcd)
 222 {
 223         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 224         int             ret;
 225
 226         ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
 227         if ((ret = ohci_init(ohci)) < 0)
 228                 return ret;
 229
 230         if ((ret = ohci_run (ohci)) < 0) {
 231                 err ("can't start %s", ohci->hcd.self.bus_name);
 232                 ohci_stop (hcd);
 233                 return ret;
 234         }
 235         return 0;
 236 }
 237
 238 /*-------------------------------------------------------------------------*/
 239
 240 static const struct hc_driver ohci_lh7a404_hc_driver = {
 241         .description =          hcd_name,
 242
 243         /*
 244          * generic hardware linkage
 245          */
 246         .irq =                  ohci_irq,
 247         .flags =                HCD_USB11,
 248
 249         /*
 250          * basic lifecycle operations
 251          */
 252         .start =                ohci_lh7a404_start,
 253 #ifdef  CONFIG_PM
 254         /* suspend:             ohci_lh7a404_suspend,  -- tbd */
 255         /* resume:              ohci_lh7a404_resume,   -- tbd */
 256 #endif /*CONFIG_PM*/
 257         .stop =                 ohci_stop,
 258
 259         /*
 260          * memory lifecycle (except per-request)
 261          */
 262         .hcd_alloc =            ohci_hcd_alloc,
 263
 264         /*
 265          * managing i/o requests and associated device resources
 266          */
 267         .urb_enqueue =          ohci_urb_enqueue,
 268         .urb_dequeue =          ohci_urb_dequeue,
 269         .endpoint_disable =     ohci_endpoint_disable,
 270
 271         /*
 272          * scheduling support
 273          */
 274         .get_frame_number =     ohci_get_frame,
 275
 276         /*
 277          * root hub support
 278          */
 279         .hub_status_data =      ohci_hub_status_data,
 280         .hub_control =          ohci_hub_control,
 281 };
 282
 283 /*-------------------------------------------------------------------------*/
 284
 285 static int ohci_hcd_lh7a404_drv_probe(struct device *dev)
 286 {
 287         struct platform_device *pdev = to_platform_device(dev);
 288         struct usb_hcd *hcd = NULL;
 289         int ret;
 290
 291         pr_debug ("In ohci_hcd_lh7a404_drv_probe");
 292
 293         if (usb_disabled())
 294                 return -ENODEV;
 295
 296         ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, &hcd, pdev);
 297
 298         if (ret == 0)
 299                 dev_set_drvdata(dev, hcd);
 300
 301         return ret;
 302 }
 303
 304 static int ohci_hcd_lh7a404_drv_remove(struct device *dev)
 305 {
 306         struct platform_device *pdev = to_platform_device(dev);
 307         struct usb_hcd *hcd = dev_get_drvdata(dev);
 308
 309         usb_hcd_lh7a404_remove(hcd, pdev);
 310         dev_set_drvdata(dev, NULL);
 311         return 0;
 312 }
 313         /*TBD*/
 314 /*static int ohci_hcd_lh7a404_drv_suspend(struct device *dev)
 315 {
 316         struct platform_device *pdev = to_platform_device(dev);
 317         struct usb_hcd *hcd = dev_get_drvdata(dev);
 318
 319         return 0;
 320 }
 321 static int ohci_hcd_lh7a404_drv_resume(struct device *dev)
 322 {
 323         struct platform_device *pdev = to_platform_device(dev);
 324         struct usb_hcd *hcd = dev_get_drvdata(dev);
 325
 326
 327         return 0;
 328 }
 329 */
 330
 331 static struct device_driver ohci_hcd_lh7a404_driver = {
 332         .name           = "lh7a404-ohci",
 333         .bus            = &platform_bus_type,
 334         .probe          = ohci_hcd_lh7a404_drv_probe,
 335         .remove         = ohci_hcd_lh7a404_drv_remove,
 336         /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
 337         /*.resume       = ohci_hcd_lh7a404_drv_resume, */
 338 };
 339
 340 static int __init ohci_hcd_lh7a404_init (void)
 341 {
 342         pr_debug (DRIVER_INFO " (LH7A404)");
 343         pr_debug ("block sizes: ed %d td %d\n",
 344                 sizeof (struct ed), sizeof (struct td));
 345
 346         return driver_register(&ohci_hcd_lh7a404_driver);
 347 }
 348
 349 static void __exit ohci_hcd_lh7a404_cleanup (void)
 350 {
 351         driver_unregister(&ohci_hcd_lh7a404_driver);
 352 }
 353
 354 module_init (ohci_hcd_lh7a404_init);
 355 module_exit (ohci_hcd_lh7a404_cleanup);