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         if(dev->resource[1].flags != IORESOURCE_IRQ){
 111                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 112                 retval = -ENOMEM;
 113                 goto err1;
 114         }
 115
 116
 117         hcd = usb_create_hcd (driver);
 118         if (hcd == NULL){
 119                 pr_debug ("hcd_alloc failed");
 120                 retval = -ENOMEM;
 121                 goto err1;
 122         }
 123         ohci_hcd_init(hcd_to_ohci(hcd));
 124
 125         hcd->irq = dev->resource[1].start;
 126         hcd->regs = addr;
 127         hcd->self.controller = &dev->dev;
 128
 129         retval = hcd_buffer_create (hcd);
 130         if (retval != 0) {
 131                 pr_debug ("pool alloc fail");
 132                 goto err2;
 133         }
 134
 135         retval = request_irq (hcd->irq, usb_hcd_lh7a404_hcim_irq, SA_INTERRUPT,
 136                               hcd->driver->description, hcd);
 137         if (retval != 0) {
 138                 pr_debug("request_irq failed");
 139                 retval = -EBUSY;
 140                 goto err3;
 141         }
 142
 143         pr_debug ("%s (LH7A404) at 0x%p, irq %d",
 144                 hcd->driver->description, hcd->regs, hcd->irq);
 145
 146         hcd->self.bus_name = "lh7a404";
 147         usb_register_bus (&hcd->self);
 148
 149         if ((retval = driver->start (hcd)) < 0)
 150         {
 151                 usb_hcd_lh7a404_remove(hcd, dev);
 152                 return retval;
 153         }
 154
 155         *hcd_out = hcd;
 156         return 0;
 157
 158  err3:
 159         hcd_buffer_destroy (hcd);
 160  err2:
 161         usb_put_hcd(hcd);
 162  err1:
 163         lh7a404_stop_hc(dev);
 164         release_mem_region(dev->resource[0].start,
 165                                 dev->resource[0].end
 166                            - dev->resource[0].start + 1);
 167         return retval;
 168 }
 169
 170
 171 /* may be called without controller electrically present */
 172 /* may be called with controller, bus, and devices active */
 173
 174 /**
 175  * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
 176  * @dev: USB Host Controller being removed
 177  * Context: !in_interrupt()
 178  *
 179  * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
 180  * the HCD's stop() method.  It is always called from a thread
 181  * context, normally "rmmod", "apmd", or something similar.
 182  *
 183  */
 184 void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
 185 {
 186         pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 187
 188         if (in_interrupt ())
 189                 BUG ();
 190
 191         hcd->state = USB_STATE_QUIESCING;
 192
 193         pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name);
 194         usb_disconnect (&hcd->self.root_hub);
 195
 196         hcd->driver->stop (hcd);
 197         hcd->state = USB_STATE_HALT;
 198
 199         free_irq (hcd->irq, hcd);
 200         hcd_buffer_destroy (hcd);
 201
 202         usb_deregister_bus (&hcd->self);
 203
 204         lh7a404_stop_hc(dev);
 205         release_mem_region(dev->resource[0].start,
 206                            dev->resource[0].end
 207                            - dev->resource[0].start + 1);
 208 }
 209
 210 /*-------------------------------------------------------------------------*/
 211
 212 static int __devinit
 213 ohci_lh7a404_start (struct usb_hcd *hcd)
 214 {
 215         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 216         int             ret;
 217
 218         ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
 219         if ((ret = ohci_init(ohci)) < 0)
 220                 return ret;
 221
 222         if ((ret = ohci_run (ohci)) < 0) {
 223                 err ("can't start %s", hcd->self.bus_name);
 224                 ohci_stop (hcd);
 225                 return ret;
 226         }
 227         return 0;
 228 }
 229
 230 /*-------------------------------------------------------------------------*/
 231
 232 static const struct hc_driver ohci_lh7a404_hc_driver = {
 233         .description =          hcd_name,
 234         .product_desc =         "LH7A404 OHCI",
 235         .hcd_priv_size =        sizeof(struct ohci_hcd),
 236
 237         /*
 238          * generic hardware linkage
 239          */
 240         .irq =                  ohci_irq,
 241         .flags =                HCD_USB11,
 242
 243         /*
 244          * basic lifecycle operations
 245          */
 246         .start =                ohci_lh7a404_start,
 247 #ifdef  CONFIG_PM
 248         /* suspend:             ohci_lh7a404_suspend,  -- tbd */
 249         /* resume:              ohci_lh7a404_resume,   -- tbd */
 250 #endif /*CONFIG_PM*/
 251         .stop =                 ohci_stop,
 252
 253         /*
 254          * managing i/o requests and associated device resources
 255          */
 256         .urb_enqueue =          ohci_urb_enqueue,
 257         .urb_dequeue =          ohci_urb_dequeue,
 258         .endpoint_disable =     ohci_endpoint_disable,
 259
 260         /*
 261          * scheduling support
 262          */
 263         .get_frame_number =     ohci_get_frame,
 264
 265         /*
 266          * root hub support
 267          */
 268         .hub_status_data =      ohci_hub_status_data,
 269         .hub_control =          ohci_hub_control,
 270 };
 271
 272 /*-------------------------------------------------------------------------*/
 273
 274 static int ohci_hcd_lh7a404_drv_probe(struct device *dev)
 275 {
 276         struct platform_device *pdev = to_platform_device(dev);
 277         struct usb_hcd *hcd = NULL;
 278         int ret;
 279
 280         pr_debug ("In ohci_hcd_lh7a404_drv_probe");
 281
 282         if (usb_disabled())
 283                 return -ENODEV;
 284
 285         ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, &hcd, pdev);
 286
 287         if (ret == 0)
 288                 dev_set_drvdata(dev, hcd);
 289
 290         return ret;
 291 }
 292
 293 static int ohci_hcd_lh7a404_drv_remove(struct device *dev)
 294 {
 295         struct platform_device *pdev = to_platform_device(dev);
 296         struct usb_hcd *hcd = dev_get_drvdata(dev);
 297
 298         usb_hcd_lh7a404_remove(hcd, pdev);
 299         dev_set_drvdata(dev, NULL);
 300         return 0;
 301 }
 302         /*TBD*/
 303 /*static int ohci_hcd_lh7a404_drv_suspend(struct device *dev)
 304 {
 305         struct platform_device *pdev = to_platform_device(dev);
 306         struct usb_hcd *hcd = dev_get_drvdata(dev);
 307
 308         return 0;
 309 }
 310 static int ohci_hcd_lh7a404_drv_resume(struct device *dev)
 311 {
 312         struct platform_device *pdev = to_platform_device(dev);
 313         struct usb_hcd *hcd = dev_get_drvdata(dev);
 314
 315
 316         return 0;
 317 }
 318 */
 319
 320 static struct device_driver ohci_hcd_lh7a404_driver = {
 321         .name           = "lh7a404-ohci",
 322         .bus            = &platform_bus_type,
 323         .probe          = ohci_hcd_lh7a404_drv_probe,
 324         .remove         = ohci_hcd_lh7a404_drv_remove,
 325         /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
 326         /*.resume       = ohci_hcd_lh7a404_drv_resume, */
 327 };
 328
 329 static int __init ohci_hcd_lh7a404_init (void)
 330 {
 331         pr_debug (DRIVER_INFO " (LH7A404)");
 332         pr_debug ("block sizes: ed %d td %d\n",
 333                 sizeof (struct ed), sizeof (struct td));
 334
 335         return driver_register(&ohci_hcd_lh7a404_driver);
 336 }
 337
 338 static void __exit ohci_hcd_lh7a404_cleanup (void)
 339 {
 340         driver_unregister(&ohci_hcd_lh7a404_driver);
 341 }
 342
 343 module_init (ohci_hcd_lh7a404_init);
 344 module_exit (ohci_hcd_lh7a404_cleanup);