drivers/usb/host/ohci-lh7a404.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 Sharp LH7A404
   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  *
  16  * This file is licenced under the GPL.
  17  */
  18
  19 #include <linux/platform_device.h>
  20
  21 #include <asm/hardware.h>
  22
  23
  24 extern int usb_disabled(void);
  25
  26 /*-------------------------------------------------------------------------*/
  27
  28 static void lh7a404_start_hc(struct platform_device *dev)
  29 {
  30         printk(KERN_DEBUG __FILE__
  31                ": starting LH7A404 OHCI USB Controller\n");
  32
  33         /*
  34          * Now, carefully enable the USB clock, and take
  35          * the USB host controller out of reset.
  36          */
  37         CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
  38         udelay(1000);
  39         USBH_CMDSTATUS = OHCI_HCR;
  40
  41         printk(KERN_DEBUG __FILE__
  42                    ": Clock to USB host has been enabled \n");
  43 }
  44
  45 static void lh7a404_stop_hc(struct platform_device *dev)
  46 {
  47         printk(KERN_DEBUG __FILE__
  48                ": stopping LH7A404 OHCI USB Controller\n");
  49
  50         CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
  51 }
  52
  53
  54 /*-------------------------------------------------------------------------*/
  55
  56 /* configure so an HC device and id are always provided */
  57 /* always called with process context; sleeping is OK */
  58
  59
  60 /**
  61  * usb_hcd_lh7a404_probe - initialize LH7A404-based HCDs
  62  * Context: !in_interrupt()
  63  *
  64  * Allocates basic resources for this USB host controller, and
  65  * then invokes the start() method for the HCD associated with it
  66  * through the hotplug entry's driver_data.
  67  *
  68  */
  69 int usb_hcd_lh7a404_probe (const struct hc_driver *driver,
  70                           struct platform_device *dev)
  71 {
  72         int retval;
  73         struct usb_hcd *hcd;
  74
  75         if (dev->resource[1].flags != IORESOURCE_IRQ) {
  76                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  77                 return -ENOMEM;
  78         }
  79
  80         hcd = usb_create_hcd(driver, &dev->dev, "lh7a404");
  81         if (!hcd)
  82                 return -ENOMEM;
  83         hcd->rsrc_start = dev->resource[0].start;
  84         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
  85
  86         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  87                 pr_debug("request_mem_region failed");
  88                 retval = -EBUSY;
  89                 goto err1;
  90         }
  91
  92         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  93         if (!hcd->regs) {
  94                 pr_debug("ioremap failed");
  95                 retval = -ENOMEM;
  96                 goto err2;
  97         }
  98
  99         lh7a404_start_hc(dev);
 100         ohci_hcd_init(hcd_to_ohci(hcd));
 101
 102         retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
 103         if (retval == 0)
 104                 return retval;
 105
 106         lh7a404_stop_hc(dev);
 107         iounmap(hcd->regs);
 108  err2:
 109         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 110  err1:
 111         usb_put_hcd(hcd);
 112         return retval;
 113 }
 114
 115
 116 /* may be called without controller electrically present */
 117 /* may be called with controller, bus, and devices active */
 118
 119 /**
 120  * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
 121  * @dev: USB Host Controller being removed
 122  * Context: !in_interrupt()
 123  *
 124  * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
 125  * the HCD's stop() method.  It is always called from a thread
 126  * context, normally "rmmod", "apmd", or something similar.
 127  *
 128  */
 129 void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
 130 {
 131         usb_remove_hcd(hcd);
 132         lh7a404_stop_hc(dev);
 133         iounmap(hcd->regs);
 134         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 135         usb_put_hcd(hcd);
 136 }
 137
 138 /*-------------------------------------------------------------------------*/
 139
 140 static int __devinit
 141 ohci_lh7a404_start (struct usb_hcd *hcd)
 142 {
 143         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 144         int             ret;
 145
 146         ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
 147         if ((ret = ohci_init(ohci)) < 0)
 148                 return ret;
 149
 150         if ((ret = ohci_run (ohci)) < 0) {
 151                 err ("can't start %s", hcd->self.bus_name);
 152                 ohci_stop (hcd);
 153                 return ret;
 154         }
 155         return 0;
 156 }
 157
 158 /*-------------------------------------------------------------------------*/
 159
 160 static const struct hc_driver ohci_lh7a404_hc_driver = {
 161         .description =          hcd_name,
 162         .product_desc =         "LH7A404 OHCI",
 163         .hcd_priv_size =        sizeof(struct ohci_hcd),
 164
 165         /*
 166          * generic hardware linkage
 167          */
 168         .irq =                  ohci_irq,
 169         .flags =                HCD_USB11 | HCD_MEMORY,
 170
 171         /*
 172          * basic lifecycle operations
 173          */
 174         .start =                ohci_lh7a404_start,
 175 #ifdef  CONFIG_PM
 176         /* suspend:             ohci_lh7a404_suspend,  -- tbd */
 177         /* resume:              ohci_lh7a404_resume,   -- tbd */
 178 #endif /*CONFIG_PM*/
 179         .stop =                 ohci_stop,
 180
 181         /*
 182          * managing i/o requests and associated device resources
 183          */
 184         .urb_enqueue =          ohci_urb_enqueue,
 185         .urb_dequeue =          ohci_urb_dequeue,
 186         .endpoint_disable =     ohci_endpoint_disable,
 187
 188         /*
 189          * scheduling support
 190          */
 191         .get_frame_number =     ohci_get_frame,
 192
 193         /*
 194          * root hub support
 195          */
 196         .hub_status_data =      ohci_hub_status_data,
 197         .hub_control =          ohci_hub_control,
 198 #ifdef  CONFIG_PM
 199         .bus_suspend =          ohci_bus_suspend,
 200         .bus_resume =           ohci_bus_resume,
 201 #endif
 202         .start_port_reset =     ohci_start_port_reset,
 203 };
 204
 205 /*-------------------------------------------------------------------------*/
 206
 207 static int ohci_hcd_lh7a404_drv_probe(struct platform_device *pdev)
 208 {
 209         int ret;
 210
 211         pr_debug ("In ohci_hcd_lh7a404_drv_probe");
 212
 213         if (usb_disabled())
 214                 return -ENODEV;
 215
 216         ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, pdev);
 217         return ret;
 218 }
 219
 220 static int ohci_hcd_lh7a404_drv_remove(struct platform_device *pdev)
 221 {
 222         struct usb_hcd *hcd = platform_get_drvdata(dev);
 223
 224         usb_hcd_lh7a404_remove(hcd, pdev);
 225         return 0;
 226 }
 227         /*TBD*/
 228 /*static int ohci_hcd_lh7a404_drv_suspend(struct platform_device *dev)
 229 {
 230         struct usb_hcd *hcd = platform_get_drvdata(dev);
 231
 232         return 0;
 233 }
 234 static int ohci_hcd_lh7a404_drv_resume(struct platform_device *dev)
 235 {
 236         struct usb_hcd *hcd = platform_get_drvdata(dev);
 237
 238
 239         return 0;
 240 }
 241 */
 242
 243 static struct platform_driver ohci_hcd_lh7a404_driver = {
 244         .probe          = ohci_hcd_lh7a404_drv_probe,
 245         .remove         = ohci_hcd_lh7a404_drv_remove,
 246         /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
 247         /*.resume       = ohci_hcd_lh7a404_drv_resume, */
 248         .driver         = {
 249                 .name   = "lh7a404-ohci",
 250                 .owner  = THIS_MODULE,
 251         },
 252 };
 253
 254 static int __init ohci_hcd_lh7a404_init (void)
 255 {
 256         pr_debug (DRIVER_INFO " (LH7A404)");
 257         pr_debug ("block sizes: ed %d td %d\n",
 258                 sizeof (struct ed), sizeof (struct td));
 259
 260         return platform_driver_register(&ohci_hcd_lh7a404_driver);
 261 }
 262
 263 static void __exit ohci_hcd_lh7a404_cleanup (void)
 264 {
 265         platform_driver_unregister(&ohci_hcd_lh7a404_driver);
 266 }
 267
 268 module_init (ohci_hcd_lh7a404_init);
 269 module_exit (ohci_hcd_lh7a404_cleanup);