drivers/usb/host/ohci-au1xxx.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 AMD Alchemy Au1xxx
   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  * Modified for AMD Alchemy Au1xxx
  16  *  by Matt Porter <mporter@kernel.crashing.org>
  17  *
  18  * This file is licenced under the GPL.
  19  */
  20
  21 #include <asm/mach-au1x00/au1000.h>
  22
  23 #define USBH_ENABLE_BE (1<<0)
  24 #define USBH_ENABLE_C  (1<<1)
  25 #define USBH_ENABLE_E  (1<<2)
  26 #define USBH_ENABLE_CE (1<<3)
  27 #define USBH_ENABLE_RD (1<<4)
  28
  29 #ifdef __LITTLE_ENDIAN
  30 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
  31 #elif __BIG_ENDIAN
  32 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
  33 #else
  34 #error not byte order defined
  35 #endif
  36
  37 extern int usb_disabled(void);
  38
  39 /*-------------------------------------------------------------------------*/
  40
  41 static void au1xxx_start_hc(struct platform_device *dev)
  42 {
  43         printk(KERN_DEBUG __FILE__
  44                 ": starting Au1xxx OHCI USB Controller\n");
  45
  46         /* enable host controller */
  47         au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
  48         udelay(1000);
  49         au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
  50         udelay(1000);
  51
  52         /* wait for reset complete (read register twice; see au1500 errata) */
  53         while (au_readl(USB_HOST_CONFIG),
  54                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
  55                 udelay(1000);
  56
  57         printk(KERN_DEBUG __FILE__
  58         ": Clock to USB host has been enabled \n");
  59 }
  60
  61 static void au1xxx_stop_hc(struct platform_device *dev)
  62 {
  63         printk(KERN_DEBUG __FILE__
  64                ": stopping Au1xxx OHCI USB Controller\n");
  65
  66         /* Disable clock */
  67         au_writel(readl((void *)USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
  68 }
  69
  70
  71 /*-------------------------------------------------------------------------*/
  72
  73
  74 static irqreturn_t usb_hcd_au1xxx_hcim_irq (int irq, void *__hcd,
  75                                              struct pt_regs * r)
  76 {
  77         struct usb_hcd *hcd = __hcd;
  78
  79         return usb_hcd_irq(irq, hcd, r);
  80 }
  81
  82 /*-------------------------------------------------------------------------*/
  83
  84 void usb_hcd_au1xxx_remove (struct usb_hcd *, struct platform_device *);
  85
  86 /* configure so an HC device and id are always provided */
  87 /* always called with process context; sleeping is OK */
  88
  89
  90 /**
  91  * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs
  92  * Context: !in_interrupt()
  93  *
  94  * Allocates basic resources for this USB host controller, and
  95  * then invokes the start() method for the HCD associated with it
  96  * through the hotplug entry's driver_data.
  97  *
  98  */
  99 int usb_hcd_au1xxx_probe (const struct hc_driver *driver,
 100                           struct usb_hcd **hcd_out,
 101                           struct platform_device *dev)
 102 {
 103         int retval;
 104         struct usb_hcd *hcd = 0;
 105
 106         unsigned int *addr = NULL;
 107
 108         if (!request_mem_region(dev->resource[0].start,
 109                                 dev->resource[0].end
 110                                 - dev->resource[0].start + 1, hcd_name)) {
 111                 pr_debug("request_mem_region failed");
 112                 return -EBUSY;
 113         }
 114
 115         au1xxx_start_hc(dev);
 116
 117         addr = ioremap(dev->resource[0].start,
 118                        dev->resource[0].end
 119                        - dev->resource[0].start + 1);
 120         if (!addr) {
 121                 pr_debug("ioremap failed");
 122                 retval = -ENOMEM;
 123                 goto err1;
 124         }
 125
 126         if(dev->resource[1].flags != IORESOURCE_IRQ) {
 127                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 128                 retval = -ENOMEM;
 129                 goto err1;
 130         }
 131
 132         hcd = usb_create_hcd(driver);
 133         if (hcd == NULL) {
 134                 pr_debug ("usb_create_hcd failed");
 135                 retval = -ENOMEM;
 136                 goto err1;
 137         }
 138         ohci_hcd_init(hcd_to_ohci(hcd));
 139
 140         hcd->irq = dev->resource[1].start;
 141         hcd->regs = addr;
 142         hcd->self.controller = &dev->dev;
 143
 144         retval = hcd_buffer_create (hcd);
 145         if (retval != 0) {
 146                 pr_debug ("pool alloc fail");
 147                 goto err2;
 148         }
 149
 150         retval = request_irq (hcd->irq, usb_hcd_au1xxx_hcim_irq, SA_INTERRUPT,
 151                               hcd->driver->description, hcd);
 152         if (retval != 0) {
 153                 pr_debug("request_irq failed");
 154                 retval = -EBUSY;
 155                 goto err3;
 156         }
 157
 158         pr_debug ("%s (Au1xxx) at 0x%p, irq %d",
 159              hcd->driver->description, hcd->regs, hcd->irq);
 160
 161         hcd->self.bus_name = "au1xxx";
 162
 163         usb_register_bus (&hcd->self);
 164
 165         if ((retval = driver->start (hcd)) < 0)
 166         {
 167                 usb_hcd_au1xxx_remove(hcd, dev);
 168                 printk("bad driver->start\n");
 169                 return retval;
 170         }
 171
 172         *hcd_out = hcd;
 173         return 0;
 174
 175  err3:
 176         hcd_buffer_destroy (hcd);
 177  err2:
 178         usb_put_hcd(hcd);
 179  err1:
 180         au1xxx_stop_hc(dev);
 181         release_mem_region(dev->resource[0].start,
 182                                 dev->resource[0].end
 183                            - dev->resource[0].start + 1);
 184         return retval;
 185 }
 186
 187
 188 /* may be called without controller electrically present */
 189 /* may be called with controller, bus, and devices active */
 190
 191 /**
 192  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 193  * @dev: USB Host Controller being removed
 194  * Context: !in_interrupt()
 195  *
 196  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 197  * the HCD's stop() method.  It is always called from a thread
 198  * context, normally "rmmod", "apmd", or something similar.
 199  *
 200  */
 201 void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
 202 {
 203         pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
 204
 205         if (in_interrupt ())
 206                 BUG ();
 207
 208         hcd->state = USB_STATE_QUIESCING;
 209
 210         pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name);
 211         usb_disconnect (&hcd->self.root_hub);
 212
 213         hcd->driver->stop (hcd);
 214         hcd->state = USB_STATE_HALT;
 215
 216         free_irq (hcd->irq, hcd);
 217         hcd_buffer_destroy (hcd);
 218
 219         usb_deregister_bus (&hcd->self);
 220
 221         au1xxx_stop_hc(dev);
 222         release_mem_region(dev->resource[0].start,
 223                            dev->resource[0].end
 224                            - dev->resource[0].start + 1);
 225 }
 226
 227 /*-------------------------------------------------------------------------*/
 228
 229 static int __devinit
 230 ohci_au1xxx_start (struct usb_hcd *hcd)
 231 {
 232         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 233         int             ret;
 234
 235         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 236
 237         if ((ret = ohci_init (ohci)) < 0)
 238                 return ret;
 239
 240         if ((ret = ohci_run (ohci)) < 0) {
 241                 err ("can't start %s", hcd->self.bus_name);
 242                 ohci_stop (hcd);
 243                 return ret;
 244         }
 245
 246         return 0;
 247 }
 248
 249 /*-------------------------------------------------------------------------*/
 250
 251 static const struct hc_driver ohci_au1xxx_hc_driver = {
 252         .description =          hcd_name,
 253         .product_desc =         "Au1xxx OHCI",
 254         .hcd_priv_size =        sizeof(struct ohci_hcd),
 255
 256         /*
 257          * generic hardware linkage
 258          */
 259         .irq =                  ohci_irq,
 260         .flags =                HCD_USB11,
 261
 262         /*
 263          * basic lifecycle operations
 264          */
 265         .start =                ohci_au1xxx_start,
 266 #ifdef  CONFIG_PM
 267         /* suspend:             ohci_au1xxx_suspend,  -- tbd */
 268         /* resume:              ohci_au1xxx_resume,   -- tbd */
 269 #endif /*CONFIG_PM*/
 270         .stop =                 ohci_stop,
 271
 272         /*
 273          * managing i/o requests and associated device resources
 274          */
 275         .urb_enqueue =          ohci_urb_enqueue,
 276         .urb_dequeue =          ohci_urb_dequeue,
 277         .endpoint_disable =     ohci_endpoint_disable,
 278
 279         /*
 280          * scheduling support
 281          */
 282         .get_frame_number =     ohci_get_frame,
 283
 284         /*
 285          * root hub support
 286          */
 287         .hub_status_data =      ohci_hub_status_data,
 288         .hub_control =          ohci_hub_control,
 289 };
 290
 291 /*-------------------------------------------------------------------------*/
 292
 293 static int ohci_hcd_au1xxx_drv_probe(struct device *dev)
 294 {
 295         struct platform_device *pdev = to_platform_device(dev);
 296         struct usb_hcd *hcd = NULL;
 297         int ret;
 298
 299         pr_debug ("In ohci_hcd_au1xxx_drv_probe");
 300
 301         if (usb_disabled())
 302                 return -ENODEV;
 303
 304         ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, &hcd, pdev);
 305
 306         if (ret == 0)
 307                 dev_set_drvdata(dev, hcd);
 308
 309         return ret;
 310 }
 311
 312 static int ohci_hcd_au1xxx_drv_remove(struct device *dev)
 313 {
 314         struct platform_device *pdev = to_platform_device(dev);
 315         struct usb_hcd *hcd = dev_get_drvdata(dev);
 316
 317         usb_hcd_au1xxx_remove(hcd, pdev);
 318         dev_set_drvdata(dev, NULL);
 319         return 0;
 320 }
 321         /*TBD*/
 322 /*static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
 323 {
 324         struct platform_device *pdev = to_platform_device(dev);
 325         struct usb_hcd *hcd = dev_get_drvdata(dev);
 326
 327         return 0;
 328 }
 329 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
 330 {
 331         struct platform_device *pdev = to_platform_device(dev);
 332         struct usb_hcd *hcd = dev_get_drvdata(dev);
 333
 334         return 0;
 335 }
 336 */
 337
 338 static struct device_driver ohci_hcd_au1xxx_driver = {
 339         .name           = "au1xxx-ohci",
 340         .bus            = &platform_bus_type,
 341         .probe          = ohci_hcd_au1xxx_drv_probe,
 342         .remove         = ohci_hcd_au1xxx_drv_remove,
 343         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 344         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 345 };
 346
 347 static int __init ohci_hcd_au1xxx_init (void)
 348 {
 349         pr_debug (DRIVER_INFO " (Au1xxx)");
 350         pr_debug ("block sizes: ed %d td %d\n",
 351                 sizeof (struct ed), sizeof (struct td));
 352
 353         return driver_register(&ohci_hcd_au1xxx_driver);
 354 }
 355
 356 static void __exit ohci_hcd_au1xxx_cleanup (void)
 357 {
 358         driver_unregister(&ohci_hcd_au1xxx_driver);
 359 }
 360
 361 module_init (ohci_hcd_au1xxx_init);
 362 module_exit (ohci_hcd_au1xxx_cleanup);