drivers/usb/host/ohci-sa1111.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  * SA1111 Bus Glue
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Rusell King et al.
  12  *
  13  * This file is licenced under the GPL.
  14  */
  15
  16 #include <asm/hardware.h>
  17 #include <asm/mach-types.h>
  18 #include <asm/arch/assabet.h>
  19 #include <asm/arch/badge4.h>
  20 #include <asm/hardware/sa1111.h>
  21
  22 #ifndef CONFIG_SA1111
  23 #error "This file is SA-1111 bus glue.  CONFIG_SA1111 must be defined."
  24 #endif
  25
  26 extern int usb_disabled(void);
  27
  28 /*-------------------------------------------------------------------------*/
  29
  30 static void sa1111_start_hc(struct sa1111_dev *dev)
  31 {
  32         unsigned int usb_rst = 0;
  33
  34         printk(KERN_DEBUG __FILE__
  35                ": starting SA-1111 OHCI USB Controller\n");
  36
  37 #ifdef CONFIG_SA1100_BADGE4
  38         if (machine_is_badge4()) {
  39                 badge4_set_5V(BADGE4_5V_USB, 1);
  40         }
  41 #endif
  42
  43         if (machine_is_xp860() ||
  44             machine_has_neponset() ||
  45             machine_is_pfs168() ||
  46             machine_is_badge4())
  47                 usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW;
  48
  49         /*
  50          * Configure the power sense and control lines.  Place the USB
  51          * host controller in reset.
  52          */
  53         sa1111_writel(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
  54                       dev->mapbase + SA1111_USB_RESET);
  55
  56         /*
  57          * Now, carefully enable the USB clock, and take
  58          * the USB host controller out of reset.
  59          */
  60         sa1111_enable_device(dev);
  61         udelay(11);
  62         sa1111_writel(usb_rst, dev->mapbase + SA1111_USB_RESET);
  63 }
  64
  65 static void sa1111_stop_hc(struct sa1111_dev *dev)
  66 {
  67         unsigned int usb_rst;
  68         printk(KERN_DEBUG __FILE__
  69                ": stopping SA-1111 OHCI USB Controller\n");
  70
  71         /*
  72          * Put the USB host controller into reset.
  73          */
  74         usb_rst = sa1111_readl(dev->mapbase + SA1111_USB_RESET);
  75         sa1111_writel(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
  76                       dev->mapbase + SA1111_USB_RESET);
  77
  78         /*
  79          * Stop the USB clock.
  80          */
  81         sa1111_disable_device(dev);
  82
  83 #ifdef CONFIG_SA1100_BADGE4
  84         if (machine_is_badge4()) {
  85                 /* Disable power to the USB bus */
  86                 badge4_set_5V(BADGE4_5V_USB, 0);
  87         }
  88 #endif
  89 }
  90
  91
  92 /*-------------------------------------------------------------------------*/
  93
  94 #if 0
  95 static void dump_hci_status(struct usb_hcd *hcd, const char *label)
  96 {
  97         unsigned long status = sa1111_readl(hcd->regs + SA1111_USB_STATUS);
  98
  99         dbg ("%s USB_STATUS = { %s%s%s%s%s}", label,
 100              ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""),
 101              ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""),
 102              ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "),
 103              ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "),
 104              ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : ""));
 105 }
 106 #endif
 107
 108 static irqreturn_t usb_hcd_sa1111_hcim_irq (int irq, void *__hcd, struct pt_regs * r)
 109 {
 110         struct usb_hcd *hcd = __hcd;
 111 //      unsigned long status = sa1111_readl(hcd->regs + SA1111_USB_STATUS);
 112
 113         //dump_hci_status(hcd, "irq");
 114
 115 #if 0
 116         /* may work better this way -- need to investigate further */
 117         if (status & USB_STATUS_NIRQHCIM) {
 118                 //dbg ("not normal HC interrupt; ignoring");
 119                 return;
 120         }
 121 #endif
 122
 123         usb_hcd_irq(irq, hcd, r);
 124
 125         /*
 126          * SA1111 seems to re-assert its interrupt immediately
 127          * after processing an interrupt.  Always return IRQ_HANDLED.
 128          */
 129         return IRQ_HANDLED;
 130 }
 131
 132 /*-------------------------------------------------------------------------*/
 133
 134 void usb_hcd_sa1111_remove (struct usb_hcd *, struct sa1111_dev *);
 135
 136 /* configure so an HC device and id are always provided */
 137 /* always called with process context; sleeping is OK */
 138
 139
 140 /**
 141  * usb_hcd_sa1111_probe - initialize SA-1111-based HCDs
 142  * Context: !in_interrupt()
 143  *
 144  * Allocates basic resources for this USB host controller, and
 145  * then invokes the start() method for the HCD associated with it
 146  * through the hotplug entry's driver_data.
 147  *
 148  * Store this function in the HCD's struct pci_driver as probe().
 149  */
 150 int usb_hcd_sa1111_probe (const struct hc_driver *driver,
 151                           struct usb_hcd **hcd_out,
 152                           struct sa1111_dev *dev)
 153 {
 154         int retval;
 155         struct usb_hcd *hcd = 0;
 156
 157         if (!request_mem_region(dev->res.start,
 158                                 dev->res.end - dev->res.start + 1, hcd_name)) {
 159                 dbg("request_mem_region failed");
 160                 return -EBUSY;
 161         }
 162
 163         sa1111_start_hc(dev);
 164
 165         hcd = driver->hcd_alloc ();
 166         if (hcd == NULL){
 167                 dbg ("hcd_alloc failed");
 168                 retval = -ENOMEM;
 169                 goto err1;
 170         }
 171
 172         hcd->driver = (struct hc_driver *) driver;
 173         hcd->description = driver->description;
 174         hcd->irq = dev->irq[1];
 175         hcd->regs = dev->mapbase;
 176         hcd->self.controller = &dev->dev;
 177
 178         retval = hcd_buffer_create (hcd);
 179         if (retval != 0) {
 180                 dbg ("pool alloc fail");
 181                 goto err1;
 182         }
 183
 184         retval = request_irq (hcd->irq, usb_hcd_sa1111_hcim_irq, SA_INTERRUPT,
 185                               hcd->description, hcd);
 186         if (retval != 0) {
 187                 dbg("request_irq failed");
 188                 retval = -EBUSY;
 189                 goto err2;
 190         }
 191
 192         info ("%s (SA-1111) at 0x%p, irq %d\n",
 193               hcd->description, hcd->regs, hcd->irq);
 194
 195         usb_bus_init (&hcd->self);
 196         hcd->self.op = &usb_hcd_operations;
 197         hcd->self.hcpriv = (void *) hcd;
 198         hcd->self.bus_name = "sa1111";
 199         hcd->product_desc = "SA-1111 OHCI";
 200
 201         INIT_LIST_HEAD (&hcd->dev_list);
 202
 203         usb_register_bus (&hcd->self);
 204
 205         if ((retval = driver->start (hcd)) < 0)
 206         {
 207                 usb_hcd_sa1111_remove(hcd, dev);
 208                 return retval;
 209         }
 210
 211         *hcd_out = hcd;
 212         return 0;
 213
 214  err2:
 215         hcd_buffer_destroy (hcd);
 216         if (hcd)
 217                 driver->hcd_free(hcd);
 218  err1:
 219         sa1111_stop_hc(dev);
 220         release_mem_region(dev->res.start, dev->res.end - dev->res.start + 1);
 221         return retval;
 222 }
 223
 224
 225 /* may be called without controller electrically present */
 226 /* may be called with controller, bus, and devices active */
 227
 228 /**
 229  * usb_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs
 230  * @dev: USB Host Controller being removed
 231  * Context: !in_interrupt()
 232  *
 233  * Reverses the effect of usb_hcd_sa1111_probe(), first invoking
 234  * the HCD's stop() method.  It is always called from a thread
 235  * context, normally "rmmod", "apmd", or something similar.
 236  *
 237  */
 238 void usb_hcd_sa1111_remove (struct usb_hcd *hcd, struct sa1111_dev *dev)
 239 {
 240         struct usb_device       *hub;
 241         void *base;
 242
 243         info ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 244
 245         if (in_interrupt ())
 246                 BUG ();
 247
 248         hub = hcd->self.root_hub;
 249         hcd->state = USB_STATE_QUIESCING;
 250
 251         dbg ("%s: roothub graceful disconnect", hcd->self.bus_name);
 252         usb_disconnect (&hub);
 253
 254         hcd->driver->stop (hcd);
 255         hcd->state = USB_STATE_HALT;
 256
 257         free_irq (hcd->irq, hcd);
 258         hcd_buffer_destroy (hcd);
 259
 260         usb_deregister_bus (&hcd->self);
 261
 262         base = hcd->regs;
 263         hcd->driver->hcd_free (hcd);
 264
 265         sa1111_stop_hc(dev);
 266         release_mem_region(dev->res.start, dev->res.end - dev->res.start + 1);
 267 }
 268
 269 /*-------------------------------------------------------------------------*/
 270
 271 static int __devinit
 272 ohci_sa1111_start (struct usb_hcd *hcd)
 273 {
 274         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 275         int             ret;
 276
 277         ohci->hcca = dma_alloc_coherent (hcd->self.controller,
 278                         sizeof *ohci->hcca, &ohci->hcca_dma, 0);
 279         if (!ohci->hcca)
 280                 return -ENOMEM;
 281
 282         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 283         if ((ret = ohci_mem_init (ohci)) < 0) {
 284                 ohci_stop (hcd);
 285                 return ret;
 286         }
 287         ohci->regs = hcd->regs;
 288
 289         if (hc_reset (ohci) < 0) {
 290                 ohci_stop (hcd);
 291                 return -ENODEV;
 292         }
 293
 294         if (hc_start (ohci) < 0) {
 295                 err ("can't start %s", ohci->hcd.self.bus_name);
 296                 ohci_stop (hcd);
 297                 return -EBUSY;
 298         }
 299         create_debug_files (ohci);
 300
 301 #ifdef  DEBUG
 302         ohci_dump (ohci, 1);
 303 #endif
 304         return 0;
 305 }
 306
 307 /*-------------------------------------------------------------------------*/
 308
 309 static const struct hc_driver ohci_sa1111_hc_driver = {
 310         .description =          hcd_name,
 311
 312         /*
 313          * generic hardware linkage
 314          */
 315         .irq =                  ohci_irq,
 316         .flags =                HCD_USB11,
 317
 318         /*
 319          * basic lifecycle operations
 320          */
 321         .start =                ohci_sa1111_start,
 322 #ifdef  CONFIG_PM
 323         /* suspend:             ohci_sa1111_suspend,  -- tbd */
 324         /* resume:              ohci_sa1111_resume,   -- tbd */
 325 #endif
 326         .stop =                 ohci_stop,
 327
 328         /*
 329          * memory lifecycle (except per-request)
 330          */
 331         .hcd_alloc =            ohci_hcd_alloc,
 332         .hcd_free =             ohci_hcd_free,
 333
 334         /*
 335          * managing i/o requests and associated device resources
 336          */
 337         .urb_enqueue =          ohci_urb_enqueue,
 338         .urb_dequeue =          ohci_urb_dequeue,
 339         .endpoint_disable =     ohci_endpoint_disable,
 340
 341         /*
 342          * scheduling support
 343          */
 344         .get_frame_number =     ohci_get_frame,
 345
 346         /*
 347          * root hub support
 348          */
 349         .hub_status_data =      ohci_hub_status_data,
 350         .hub_control =          ohci_hub_control,
 351 };
 352
 353 /*-------------------------------------------------------------------------*/
 354
 355 static int ohci_hcd_sa1111_drv_probe(struct sa1111_dev *dev)
 356 {
 357         struct usb_hcd *hcd = NULL;
 358         int ret;
 359
 360         if (usb_disabled())
 361                 return -ENODEV;
 362
 363         ret = usb_hcd_sa1111_probe(&ohci_sa1111_hc_driver, &hcd, dev);
 364
 365         if (ret == 0)
 366                 sa1111_set_drvdata(dev, hcd);
 367
 368         return ret;
 369 }
 370
 371 static int ohci_hcd_sa1111_drv_remove(struct sa1111_dev *dev)
 372 {
 373         struct usb_hcd *hcd = sa1111_get_drvdata(dev);
 374
 375         usb_hcd_sa1111_remove(hcd, dev);
 376
 377         sa1111_set_drvdata(dev, NULL);
 378
 379         return 0;
 380 }
 381
 382 static struct sa1111_driver ohci_hcd_sa1111_driver = {
 383         .drv = {
 384                 .name   = "sa1111-ohci",
 385         },
 386         .devid          = SA1111_DEVID_USB,
 387         .probe          = ohci_hcd_sa1111_drv_probe,
 388         .remove         = ohci_hcd_sa1111_drv_remove,
 389 };
 390
 391 static int __init ohci_hcd_sa1111_init (void)
 392 {
 393         dbg (DRIVER_INFO " (SA-1111)");
 394         dbg ("block sizes: ed %d td %d",
 395                 sizeof (struct ed), sizeof (struct td));
 396
 397         return sa1111_driver_register(&ohci_hcd_sa1111_driver);
 398 }
 399
 400 static void __exit ohci_hcd_sa1111_cleanup (void)
 401 {
 402         sa1111_driver_unregister(&ohci_hcd_sa1111_driver);
 403 }
 404
 405 module_init (ohci_hcd_sa1111_init);
 406 module_exit (ohci_hcd_sa1111_cleanup);