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 #include <linux/signal.h>
  23
  24 #include <asm/mach-au1x00/au1000.h>
  25
  26 #define USBH_ENABLE_BE (1<<0)
  27 #define USBH_ENABLE_C  (1<<1)
  28 #define USBH_ENABLE_E  (1<<2)
  29 #define USBH_ENABLE_CE (1<<3)
  30 #define USBH_ENABLE_RD (1<<4)
  31
  32 #ifdef __LITTLE_ENDIAN
  33 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
  34 #elif __BIG_ENDIAN
  35 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
  36 #else
  37 #error not byte order defined
  38 #endif
  39
  40 extern int usb_disabled(void);
  41
  42 /*-------------------------------------------------------------------------*/
  43
  44 static void au1xxx_start_hc(struct platform_device *dev)
  45 {
  46         printk(KERN_DEBUG __FILE__
  47                 ": starting Au1xxx OHCI USB Controller\n");
  48
  49         /* enable host controller */
  50         au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
  51         udelay(1000);
  52         au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
  53         udelay(1000);
  54
  55         /* wait for reset complete (read register twice; see au1500 errata) */
  56         while (au_readl(USB_HOST_CONFIG),
  57                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
  58                 udelay(1000);
  59
  60         printk(KERN_DEBUG __FILE__
  61         ": Clock to USB host has been enabled \n");
  62 }
  63
  64 static void au1xxx_stop_hc(struct platform_device *dev)
  65 {
  66         printk(KERN_DEBUG __FILE__
  67                ": stopping Au1xxx OHCI USB Controller\n");
  68
  69         /* Disable clock */
  70         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
  71 }
  72
  73
  74 /*-------------------------------------------------------------------------*/
  75
  76 /* configure so an HC device and id are always provided */
  77 /* always called with process context; sleeping is OK */
  78
  79
  80 /**
  81  * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs
  82  * Context: !in_interrupt()
  83  *
  84  * Allocates basic resources for this USB host controller, and
  85  * then invokes the start() method for the HCD associated with it
  86  * through the hotplug entry's driver_data.
  87  *
  88  */
  89 int usb_hcd_au1xxx_probe (const struct hc_driver *driver,
  90                           struct platform_device *dev)
  91 {
  92         int retval;
  93         struct usb_hcd *hcd;
  94
  95         if(dev->resource[1].flags != IORESOURCE_IRQ) {
  96                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
  97                 return -ENOMEM;
  98         }
  99
 100         hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
 101         if (!hcd)
 102                 return -ENOMEM;
 103         hcd->rsrc_start = dev->resource[0].start;
 104         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 105
 106         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 107                 pr_debug("request_mem_region failed");
 108                 retval = -EBUSY;
 109                 goto err1;
 110         }
 111
 112         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 113         if (!hcd->regs) {
 114                 pr_debug("ioremap failed");
 115                 retval = -ENOMEM;
 116                 goto err2;
 117         }
 118
 119         au1xxx_start_hc(dev);
 120         ohci_hcd_init(hcd_to_ohci(hcd));
 121
 122         retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
 123         if (retval == 0)
 124                 return retval;
 125
 126         au1xxx_stop_hc(dev);
 127         iounmap(hcd->regs);
 128  err2:
 129         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 130  err1:
 131         usb_put_hcd(hcd);
 132         return retval;
 133 }
 134
 135
 136 /* may be called without controller electrically present */
 137 /* may be called with controller, bus, and devices active */
 138
 139 /**
 140  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 141  * @dev: USB Host Controller being removed
 142  * Context: !in_interrupt()
 143  *
 144  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 145  * the HCD's stop() method.  It is always called from a thread
 146  * context, normally "rmmod", "apmd", or something similar.
 147  *
 148  */
 149 void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
 150 {
 151         usb_remove_hcd(hcd);
 152         au1xxx_stop_hc(dev);
 153         iounmap(hcd->regs);
 154         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 155         usb_put_hcd(hcd);
 156 }
 157
 158 /*-------------------------------------------------------------------------*/
 159
 160 static int __devinit
 161 ohci_au1xxx_start (struct usb_hcd *hcd)
 162 {
 163         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 164         int             ret;
 165
 166         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 167
 168         if ((ret = ohci_init (ohci)) < 0)
 169                 return ret;
 170
 171         if ((ret = ohci_run (ohci)) < 0) {
 172                 err ("can't start %s", hcd->self.bus_name);
 173                 ohci_stop (hcd);
 174                 return ret;
 175         }
 176
 177         return 0;
 178 }
 179
 180 /*-------------------------------------------------------------------------*/
 181
 182 static const struct hc_driver ohci_au1xxx_hc_driver = {
 183         .description =          hcd_name,
 184         .product_desc =         "Au1xxx OHCI",
 185         .hcd_priv_size =        sizeof(struct ohci_hcd),
 186
 187         /*
 188          * generic hardware linkage
 189          */
 190         .irq =                  ohci_irq,
 191         .flags =                HCD_USB11 | HCD_MEMORY,
 192
 193         /*
 194          * basic lifecycle operations
 195          */
 196         .start =                ohci_au1xxx_start,
 197 #ifdef  CONFIG_PM
 198         /* suspend:             ohci_au1xxx_suspend,  -- tbd */
 199         /* resume:              ohci_au1xxx_resume,   -- tbd */
 200 #endif /*CONFIG_PM*/
 201         .stop =                 ohci_stop,
 202
 203         /*
 204          * managing i/o requests and associated device resources
 205          */
 206         .urb_enqueue =          ohci_urb_enqueue,
 207         .urb_dequeue =          ohci_urb_dequeue,
 208         .endpoint_disable =     ohci_endpoint_disable,
 209
 210         /*
 211          * scheduling support
 212          */
 213         .get_frame_number =     ohci_get_frame,
 214
 215         /*
 216          * root hub support
 217          */
 218         .hub_status_data =      ohci_hub_status_data,
 219         .hub_control =          ohci_hub_control,
 220 #ifdef  CONFIG_PM
 221         .bus_suspend =          ohci_bus_suspend,
 222         .bus_resume =           ohci_bus_resume,
 223 #endif
 224         .start_port_reset =     ohci_start_port_reset,
 225 };
 226
 227 /*-------------------------------------------------------------------------*/
 228
 229 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 230 {
 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 platform_device *pdev)
 243 {
 244         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 245
 246         usb_hcd_au1xxx_remove(hcd, pdev);
 247         return 0;
 248 }
 249         /*TBD*/
 250 /*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
 251 {
 252         struct usb_hcd *hcd = platform_get_drvdata(dev);
 253
 254         return 0;
 255 }
 256 static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
 257 {
 258         struct usb_hcd *hcd = platform_get_drvdata(dev);
 259
 260         return 0;
 261 }
 262 */
 263
 264 static struct platform_driver ohci_hcd_au1xxx_driver = {
 265         .probe          = ohci_hcd_au1xxx_drv_probe,
 266         .remove         = ohci_hcd_au1xxx_drv_remove,
 267         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 268         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 269         .driver         = {
 270                 .name   = "au1xxx-ohci",
 271                 .owner  = THIS_MODULE,
 272         },
 273 };
 274
 275 static int __init ohci_hcd_au1xxx_init (void)
 276 {
 277         pr_debug (DRIVER_INFO " (Au1xxx)");
 278         pr_debug ("block sizes: ed %d td %d\n",
 279                 sizeof (struct ed), sizeof (struct td));
 280
 281         return platform_driver_register(&ohci_hcd_au1xxx_driver);
 282 }
 283
 284 static void __exit ohci_hcd_au1xxx_cleanup (void)
 285 {
 286         platform_driver_unregister(&ohci_hcd_au1xxx_driver);
 287 }
 288
 289 module_init (ohci_hcd_au1xxx_init);
 290 module_exit (ohci_hcd_au1xxx_cleanup);