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.release = &usb_hcd_release;
 198         hcd->self.hcpriv = (void *) hcd;
 199         hcd->self.bus_name = "sa1111";
 200         hcd->product_desc = "SA-1111 OHCI";
 201
 202         INIT_LIST_HEAD (&hcd->dev_list);
 203
 204         usb_register_bus (&hcd->self);
 205
 206         if ((retval = driver->start (hcd)) < 0)
 207         {
 208                 usb_hcd_sa1111_remove(hcd, dev);
 209                 return retval;
 210         }
 211
 212         *hcd_out = hcd;
 213         return 0;
 214
 215  err2:
 216         hcd_buffer_destroy (hcd);
 217  err1:
 218         kfree(hcd);
 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         info ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 241
 242         if (in_interrupt ())
 243                 BUG ();
 244
 245         hcd->state = USB_STATE_QUIESCING;
 246
 247         dbg ("%s: roothub graceful disconnect", hcd->self.bus_name);
 248         usb_disconnect (&hcd->self.root_hub);
 249
 250         hcd->driver->stop (hcd);
 251         hcd->state = USB_STATE_HALT;
 252
 253         free_irq (hcd->irq, hcd);
 254         hcd_buffer_destroy (hcd);
 255
 256         usb_deregister_bus (&hcd->self);
 257
 258         sa1111_stop_hc(dev);
 259         release_mem_region(dev->res.start, dev->res.end - dev->res.start + 1);
 260 }
 261
 262 /*-------------------------------------------------------------------------*/
 263
 264 static int __devinit
 265 ohci_sa1111_start (struct usb_hcd *hcd)
 266 {
 267         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 268         int             ret;
 269
 270         if ((ret = ohci_init(ohci)) < 0)
 271                 return ret;
 272
 273         if ((ret = ohci_run (ohci)) < 0) {
 274                 err ("can't start %s", ohci->hcd.self.bus_name);
 275                 ohci_stop (hcd);
 276                 return ret;
 277         }
 278         return 0;
 279 }
 280
 281 /*-------------------------------------------------------------------------*/
 282
 283 static const struct hc_driver ohci_sa1111_hc_driver = {
 284         .description =          hcd_name,
 285
 286         /*
 287          * generic hardware linkage
 288          */
 289         .irq =                  ohci_irq,
 290         .flags =                HCD_USB11,
 291
 292         /*
 293          * basic lifecycle operations
 294          */
 295         .start =                ohci_sa1111_start,
 296 #ifdef  CONFIG_PM
 297         /* suspend:             ohci_sa1111_suspend,  -- tbd */
 298         /* resume:              ohci_sa1111_resume,   -- tbd */
 299 #endif
 300         .stop =                 ohci_stop,
 301
 302         /*
 303          * memory lifecycle (except per-request)
 304          */
 305         .hcd_alloc =            ohci_hcd_alloc,
 306
 307         /*
 308          * managing i/o requests and associated device resources
 309          */
 310         .urb_enqueue =          ohci_urb_enqueue,
 311         .urb_dequeue =          ohci_urb_dequeue,
 312         .endpoint_disable =     ohci_endpoint_disable,
 313
 314         /*
 315          * scheduling support
 316          */
 317         .get_frame_number =     ohci_get_frame,
 318
 319         /*
 320          * root hub support
 321          */
 322         .hub_status_data =      ohci_hub_status_data,
 323         .hub_control =          ohci_hub_control,
 324 #ifdef  CONFIG_USB_SUSPEND
 325         .hub_suspend =          ohci_hub_suspend,
 326         .hub_resume =           ohci_hub_resume,
 327 #endif
 328 };
 329
 330 /*-------------------------------------------------------------------------*/
 331
 332 static int ohci_hcd_sa1111_drv_probe(struct sa1111_dev *dev)
 333 {
 334         struct usb_hcd *hcd = NULL;
 335         int ret;
 336
 337         if (usb_disabled())
 338                 return -ENODEV;
 339
 340         ret = usb_hcd_sa1111_probe(&ohci_sa1111_hc_driver, &hcd, dev);
 341
 342         if (ret == 0)
 343                 sa1111_set_drvdata(dev, hcd);
 344
 345         return ret;
 346 }
 347
 348 static int ohci_hcd_sa1111_drv_remove(struct sa1111_dev *dev)
 349 {
 350         struct usb_hcd *hcd = sa1111_get_drvdata(dev);
 351
 352         usb_hcd_sa1111_remove(hcd, dev);
 353
 354         sa1111_set_drvdata(dev, NULL);
 355
 356         return 0;
 357 }
 358
 359 static struct sa1111_driver ohci_hcd_sa1111_driver = {
 360         .drv = {
 361                 .name   = "sa1111-ohci",
 362         },
 363         .devid          = SA1111_DEVID_USB,
 364         .probe          = ohci_hcd_sa1111_drv_probe,
 365         .remove         = ohci_hcd_sa1111_drv_remove,
 366 };
 367
 368 static int __init ohci_hcd_sa1111_init (void)
 369 {
 370         dbg (DRIVER_INFO " (SA-1111)");
 371         dbg ("block sizes: ed %d td %d",
 372                 sizeof (struct ed), sizeof (struct td));
 373
 374         return sa1111_driver_register(&ohci_hcd_sa1111_driver);
 375 }
 376
 377 static void __exit ohci_hcd_sa1111_cleanup (void)
 378 {
 379         sa1111_driver_unregister(&ohci_hcd_sa1111_driver);
 380 }
 381
 382 module_init (ohci_hcd_sa1111_init);
 383 module_exit (ohci_hcd_sa1111_cleanup);