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 <linux/platform_device.h>
  22
  23 #include <asm/mach-au1x00/au1000.h>
  24
  25 #define USBH_ENABLE_BE (1<<0)
  26 #define USBH_ENABLE_C  (1<<1)
  27 #define USBH_ENABLE_E  (1<<2)
  28 #define USBH_ENABLE_CE (1<<3)
  29 #define USBH_ENABLE_RD (1<<4)
  30
  31 #ifdef __LITTLE_ENDIAN
  32 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
  33 #elif __BIG_ENDIAN
  34 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
  35 #else
  36 #error not byte order defined
  37 #endif
  38
  39 extern int usb_disabled(void);
  40
  41 /*-------------------------------------------------------------------------*/
  42
  43 static void au1xxx_start_hc(struct platform_device *dev)
  44 {
  45         printk(KERN_DEBUG __FILE__
  46                 ": starting Au1xxx OHCI USB Controller\n");
  47
  48         /* enable host controller */
  49         au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
  50         udelay(1000);
  51         au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
  52         udelay(1000);
  53
  54         /* wait for reset complete (read register twice; see au1500 errata) */
  55         while (au_readl(USB_HOST_CONFIG),
  56                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
  57                 udelay(1000);
  58
  59         printk(KERN_DEBUG __FILE__
  60         ": Clock to USB host has been enabled \n");
  61 }
  62
  63 static void au1xxx_stop_hc(struct platform_device *dev)
  64 {
  65         printk(KERN_DEBUG __FILE__
  66                ": stopping Au1xxx OHCI USB Controller\n");
  67
  68         /* Disable clock */
  69         au_writel(readl((void *)USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
  70 }
  71
  72
  73 /*-------------------------------------------------------------------------*/
  74
  75 /* configure so an HC device and id are always provided */
  76 /* always called with process context; sleeping is OK */
  77
  78
  79 /**
  80  * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs
  81  * Context: !in_interrupt()
  82  *
  83  * Allocates basic resources for this USB host controller, and
  84  * then invokes the start() method for the HCD associated with it
  85  * through the hotplug entry's driver_data.
  86  *
  87  */
  88 int usb_hcd_au1xxx_probe (const struct hc_driver *driver,
  89                           struct platform_device *dev)
  90 {
  91         int retval;
  92         struct usb_hcd *hcd;
  93
  94         if(dev->resource[1].flags != IORESOURCE_IRQ) {
  95                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
  96                 return -ENOMEM;
  97         }
  98
  99         hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
 100         if (!hcd)
 101                 return -ENOMEM;
 102         hcd->rsrc_start = dev->resource[0].start;
 103         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 104
 105         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 106                 pr_debug("request_mem_region failed");
 107                 retval = -EBUSY;
 108                 goto err1;
 109         }
 110
 111         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 112         if (!hcd->regs) {
 113                 pr_debug("ioremap failed");
 114                 retval = -ENOMEM;
 115                 goto err2;
 116         }
 117
 118         au1xxx_start_hc(dev);
 119         ohci_hcd_init(hcd_to_ohci(hcd));
 120
 121         retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
 122         if (retval == 0)
 123                 return retval;
 124
 125         au1xxx_stop_hc(dev);
 126         iounmap(hcd->regs);
 127  err2:
 128         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 129  err1:
 130         usb_put_hcd(hcd);
 131         return retval;
 132 }
 133
 134
 135 /* may be called without controller electrically present */
 136 /* may be called with controller, bus, and devices active */
 137
 138 /**
 139  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 140  * @dev: USB Host Controller being removed
 141  * Context: !in_interrupt()
 142  *
 143  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 144  * the HCD's stop() method.  It is always called from a thread
 145  * context, normally "rmmod", "apmd", or something similar.
 146  *
 147  */
 148 void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
 149 {
 150         usb_remove_hcd(hcd);
 151         au1xxx_stop_hc(dev);
 152         iounmap(hcd->regs);
 153         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 154         usb_put_hcd(hcd);
 155 }
 156
 157 /*-------------------------------------------------------------------------*/
 158
 159 static int __devinit
 160 ohci_au1xxx_start (struct usb_hcd *hcd)
 161 {
 162         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 163         int             ret;
 164
 165         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 166
 167         if ((ret = ohci_init (ohci)) < 0)
 168                 return ret;
 169
 170         if ((ret = ohci_run (ohci)) < 0) {
 171                 err ("can't start %s", hcd->self.bus_name);
 172                 ohci_stop (hcd);
 173                 return ret;
 174         }
 175
 176         return 0;
 177 }
 178
 179 /*-------------------------------------------------------------------------*/
 180
 181 static const struct hc_driver ohci_au1xxx_hc_driver = {
 182         .description =          hcd_name,
 183         .product_desc =         "Au1xxx OHCI",
 184         .hcd_priv_size =        sizeof(struct ohci_hcd),
 185
 186         /*
 187          * generic hardware linkage
 188          */
 189         .irq =                  ohci_irq,
 190         .flags =                HCD_USB11 | HCD_MEMORY,
 191
 192         /*
 193          * basic lifecycle operations
 194          */
 195         .start =                ohci_au1xxx_start,
 196 #ifdef  CONFIG_PM
 197         /* suspend:             ohci_au1xxx_suspend,  -- tbd */
 198         /* resume:              ohci_au1xxx_resume,   -- tbd */
 199 #endif /*CONFIG_PM*/
 200         .stop =                 ohci_stop,
 201
 202         /*
 203          * managing i/o requests and associated device resources
 204          */
 205         .urb_enqueue =          ohci_urb_enqueue,
 206         .urb_dequeue =          ohci_urb_dequeue,
 207         .endpoint_disable =     ohci_endpoint_disable,
 208
 209         /*
 210          * scheduling support
 211          */
 212         .get_frame_number =     ohci_get_frame,
 213
 214         /*
 215          * root hub support
 216          */
 217         .hub_status_data =      ohci_hub_status_data,
 218         .hub_control =          ohci_hub_control,
 219 #ifdef  CONFIG_PM
 220         .bus_suspend =          ohci_bus_suspend,
 221         .bus_resume =           ohci_bus_resume,
 222 #endif
 223         .start_port_reset =     ohci_start_port_reset,
 224 };
 225
 226 /*-------------------------------------------------------------------------*/
 227
 228 static int ohci_hcd_au1xxx_drv_probe(struct device *dev)
 229 {
 230         struct platform_device *pdev = to_platform_device(dev);
 231         int ret;
 232
 233         pr_debug ("In ohci_hcd_au1xxx_drv_probe");
 234
 235         if (usb_disabled())
 236                 return -ENODEV;
 237
 238         ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
 239         return ret;
 240 }
 241
 242 static int ohci_hcd_au1xxx_drv_remove(struct device *dev)
 243 {
 244         struct platform_device *pdev = to_platform_device(dev);
 245         struct usb_hcd *hcd = dev_get_drvdata(dev);
 246
 247         usb_hcd_au1xxx_remove(hcd, pdev);
 248         return 0;
 249 }
 250         /*TBD*/
 251 /*static int ohci_hcd_au1xxx_drv_suspend(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 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
 259 {
 260         struct platform_device *pdev = to_platform_device(dev);
 261         struct usb_hcd *hcd = dev_get_drvdata(dev);
 262
 263         return 0;
 264 }
 265 */
 266
 267 static struct device_driver ohci_hcd_au1xxx_driver = {
 268         .name           = "au1xxx-ohci",
 269         .owner          = THIS_MODULE,
 270         .bus            = &platform_bus_type,
 271         .probe          = ohci_hcd_au1xxx_drv_probe,
 272         .remove         = ohci_hcd_au1xxx_drv_remove,
 273         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 274         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 275 };
 276
 277 static int __init ohci_hcd_au1xxx_init (void)
 278 {
 279         pr_debug (DRIVER_INFO " (Au1xxx)");
 280         pr_debug ("block sizes: ed %d td %d\n",
 281                 sizeof (struct ed), sizeof (struct td));
 282
 283         return driver_register(&ohci_hcd_au1xxx_driver);
 284 }
 285
 286 static void __exit ohci_hcd_au1xxx_cleanup (void)
 287 {
 288         driver_unregister(&ohci_hcd_au1xxx_driver);
 289 }
 290
 291 module_init (ohci_hcd_au1xxx_init);
 292 module_exit (ohci_hcd_au1xxx_cleanup);