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 /* configure so an HC device and id are always provided */
  74 /* always called with process context; sleeping is OK */
  75
  76
  77 /**
  78  * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs
  79  * Context: !in_interrupt()
  80  *
  81  * Allocates basic resources for this USB host controller, and
  82  * then invokes the start() method for the HCD associated with it
  83  * through the hotplug entry's driver_data.
  84  *
  85  */
  86 int usb_hcd_au1xxx_probe (const struct hc_driver *driver,
  87                           struct platform_device *dev)
  88 {
  89         int retval;
  90         struct usb_hcd *hcd;
  91
  92         if(dev->resource[1].flags != IORESOURCE_IRQ) {
  93                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
  94                 return -ENOMEM;
  95         }
  96
  97         hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
  98         if (!hcd)
  99                 return -ENOMEM;
 100         hcd->rsrc_start = dev->resource[0].start;
 101         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 102
 103         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 104                 pr_debug("request_mem_region failed");
 105                 retval = -EBUSY;
 106                 goto err1;
 107         }
 108
 109         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 110         if (!hcd->regs) {
 111                 pr_debug("ioremap failed");
 112                 retval = -ENOMEM;
 113                 goto err2;
 114         }
 115
 116         au1xxx_start_hc(dev);
 117         ohci_hcd_init(hcd_to_ohci(hcd));
 118
 119         retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
 120         if (retval == 0)
 121                 return retval;
 122
 123         au1xxx_stop_hc(dev);
 124         iounmap(hcd->regs);
 125  err2:
 126         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 127  err1:
 128         usb_put_hcd(hcd);
 129         return retval;
 130 }
 131
 132
 133 /* may be called without controller electrically present */
 134 /* may be called with controller, bus, and devices active */
 135
 136 /**
 137  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 138  * @dev: USB Host Controller being removed
 139  * Context: !in_interrupt()
 140  *
 141  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 142  * the HCD's stop() method.  It is always called from a thread
 143  * context, normally "rmmod", "apmd", or something similar.
 144  *
 145  */
 146 void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
 147 {
 148         usb_remove_hcd(hcd);
 149         au1xxx_stop_hc(dev);
 150         iounmap(hcd->regs);
 151         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 152         usb_put_hcd(hcd);
 153 }
 154
 155 /*-------------------------------------------------------------------------*/
 156
 157 static int __devinit
 158 ohci_au1xxx_start (struct usb_hcd *hcd)
 159 {
 160         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 161         int             ret;
 162
 163         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 164
 165         if ((ret = ohci_init (ohci)) < 0)
 166                 return ret;
 167
 168         if ((ret = ohci_run (ohci)) < 0) {
 169                 err ("can't start %s", hcd->self.bus_name);
 170                 ohci_stop (hcd);
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 /*-------------------------------------------------------------------------*/
 178
 179 static const struct hc_driver ohci_au1xxx_hc_driver = {
 180         .description =          hcd_name,
 181         .product_desc =         "Au1xxx OHCI",
 182         .hcd_priv_size =        sizeof(struct ohci_hcd),
 183
 184         /*
 185          * generic hardware linkage
 186          */
 187         .irq =                  ohci_irq,
 188         .flags =                HCD_USB11 | HCD_MEMORY,
 189
 190         /*
 191          * basic lifecycle operations
 192          */
 193         .start =                ohci_au1xxx_start,
 194 #ifdef  CONFIG_PM
 195         /* suspend:             ohci_au1xxx_suspend,  -- tbd */
 196         /* resume:              ohci_au1xxx_resume,   -- tbd */
 197 #endif /*CONFIG_PM*/
 198         .stop =                 ohci_stop,
 199
 200         /*
 201          * managing i/o requests and associated device resources
 202          */
 203         .urb_enqueue =          ohci_urb_enqueue,
 204         .urb_dequeue =          ohci_urb_dequeue,
 205         .endpoint_disable =     ohci_endpoint_disable,
 206
 207         /*
 208          * scheduling support
 209          */
 210         .get_frame_number =     ohci_get_frame,
 211
 212         /*
 213          * root hub support
 214          */
 215         .hub_status_data =      ohci_hub_status_data,
 216         .hub_control =          ohci_hub_control,
 217 };
 218
 219 /*-------------------------------------------------------------------------*/
 220
 221 static int ohci_hcd_au1xxx_drv_probe(struct device *dev)
 222 {
 223         struct platform_device *pdev = to_platform_device(dev);
 224         int ret;
 225
 226         pr_debug ("In ohci_hcd_au1xxx_drv_probe");
 227
 228         if (usb_disabled())
 229                 return -ENODEV;
 230
 231         ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
 232         return ret;
 233 }
 234
 235 static int ohci_hcd_au1xxx_drv_remove(struct device *dev)
 236 {
 237         struct platform_device *pdev = to_platform_device(dev);
 238         struct usb_hcd *hcd = dev_get_drvdata(dev);
 239
 240         usb_hcd_au1xxx_remove(hcd, pdev);
 241         return 0;
 242 }
 243         /*TBD*/
 244 /*static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
 245 {
 246         struct platform_device *pdev = to_platform_device(dev);
 247         struct usb_hcd *hcd = dev_get_drvdata(dev);
 248
 249         return 0;
 250 }
 251 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
 252 {
 253         struct platform_device *pdev = to_platform_device(dev);
 254         struct usb_hcd *hcd = dev_get_drvdata(dev);
 255
 256         return 0;
 257 }
 258 */
 259
 260 static struct device_driver ohci_hcd_au1xxx_driver = {
 261         .name           = "au1xxx-ohci",
 262         .bus            = &platform_bus_type,
 263         .probe          = ohci_hcd_au1xxx_drv_probe,
 264         .remove         = ohci_hcd_au1xxx_drv_remove,
 265         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 266         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 267 };
 268
 269 static int __init ohci_hcd_au1xxx_init (void)
 270 {
 271         pr_debug (DRIVER_INFO " (Au1xxx)");
 272         pr_debug ("block sizes: ed %d td %d\n",
 273                 sizeof (struct ed), sizeof (struct td));
 274
 275         return driver_register(&ohci_hcd_au1xxx_driver);
 276 }
 277
 278 static void __exit ohci_hcd_au1xxx_cleanup (void)
 279 {
 280         driver_unregister(&ohci_hcd_au1xxx_driver);
 281 }
 282
 283 module_init (ohci_hcd_au1xxx_init);
 284 module_exit (ohci_hcd_au1xxx_cleanup);