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 Russell 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 #include <linux/signal.h>
  21
  22 #include <mach/hardware.h>
  23
  24
  25 extern int usb_disabled(void);
  26
  27 /*-------------------------------------------------------------------------*/
  28
  29 static void lh7a404_start_hc(struct platform_device *dev)
  30 {
  31         printk(KERN_DEBUG "%s: starting LH7A404 OHCI USB Controller\n",
  32                __FILE__);
  33
  34         /*
  35          * Now, carefully enable the USB clock, and take
  36          * the USB host controller out of reset.
  37          */
  38         CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
  39         udelay(1000);
  40         USBH_CMDSTATUS = OHCI_HCR;
  41
  42         printk(KERN_DEBUG "%s: Clock to USB host has been enabled \n", __FILE__);
  43 }
  44
  45 static void lh7a404_stop_hc(struct platform_device *dev)
  46 {
  47         printk(KERN_DEBUG "%s: stopping LH7A404 OHCI USB Controller\n",
  48                __FILE__);
  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, IRQF_DISABLED);
 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         .stop =                 ohci_stop,
 176         .shutdown =             ohci_shutdown,
 177
 178         /*
 179          * managing i/o requests and associated device resources
 180          */
 181         .urb_enqueue =          ohci_urb_enqueue,
 182         .urb_dequeue =          ohci_urb_dequeue,
 183         .endpoint_disable =     ohci_endpoint_disable,
 184
 185         /*
 186          * scheduling support
 187          */
 188         .get_frame_number =     ohci_get_frame,
 189
 190         /*
 191          * root hub support
 192          */
 193         .hub_status_data =      ohci_hub_status_data,
 194         .hub_control =          ohci_hub_control,
 195 #ifdef  CONFIG_PM
 196         .bus_suspend =          ohci_bus_suspend,
 197         .bus_resume =           ohci_bus_resume,
 198 #endif
 199         .start_port_reset =     ohci_start_port_reset,
 200 };
 201
 202 /*-------------------------------------------------------------------------*/
 203
 204 static int ohci_hcd_lh7a404_drv_probe(struct platform_device *pdev)
 205 {
 206         int ret;
 207
 208         pr_debug ("In ohci_hcd_lh7a404_drv_probe");
 209
 210         if (usb_disabled())
 211                 return -ENODEV;
 212
 213         ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, pdev);
 214         return ret;
 215 }
 216
 217 static int ohci_hcd_lh7a404_drv_remove(struct platform_device *pdev)
 218 {
 219         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 220
 221         usb_hcd_lh7a404_remove(hcd, pdev);
 222         return 0;
 223 }
 224         /*TBD*/
 225 /*static int ohci_hcd_lh7a404_drv_suspend(struct platform_device *dev)
 226 {
 227         struct usb_hcd *hcd = platform_get_drvdata(dev);
 228
 229         return 0;
 230 }
 231 static int ohci_hcd_lh7a404_drv_resume(struct platform_device *dev)
 232 {
 233         struct usb_hcd *hcd = platform_get_drvdata(dev);
 234
 235
 236         return 0;
 237 }
 238 */
 239
 240 static struct platform_driver ohci_hcd_lh7a404_driver = {
 241         .probe          = ohci_hcd_lh7a404_drv_probe,
 242         .remove         = ohci_hcd_lh7a404_drv_remove,
 243         .shutdown       = usb_hcd_platform_shutdown,
 244         /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
 245         /*.resume       = ohci_hcd_lh7a404_drv_resume, */
 246         .driver         = {
 247                 .name   = "lh7a404-ohci",
 248                 .owner  = THIS_MODULE,
 249         },
 250 };
 251
 252 MODULE_ALIAS("platform:lh7a404-ohci");