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