drivers/usb/host/ohci-ep93xx.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 ep93xx.
   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  * Modified for pxa27x from ohci-lh7a404.c
  17  *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
  18  *
  19  * Modified for ep93xx from ohci-pxa27x.c
  20  *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
  21  *  Based on an earlier driver by Ray Lehtiniemi
  22  *
  23  * This file is licenced under the GPL.
  24  */
  25
  26 #include <linux/clk.h>
  27 #include <linux/device.h>
  28 #include <linux/signal.h>
  29 #include <linux/platform_device.h>
  30
  31 #include <asm/mach-types.h>
  32 #include <asm/hardware.h>
  33
  34 static struct clk *usb_host_clock;
  35
  36 static void ep93xx_start_hc(struct device *dev)
  37 {
  38         clk_enable(usb_host_clock);
  39 }
  40
  41 static void ep93xx_stop_hc(struct device *dev)
  42 {
  43         clk_disable(usb_host_clock);
  44 }
  45
  46 static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
  47                          struct platform_device *pdev)
  48 {
  49         int retval;
  50         struct usb_hcd *hcd;
  51
  52         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
  53                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  54                 return -ENOMEM;
  55         }
  56
  57         hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
  58         if (hcd == NULL)
  59                 return -ENOMEM;
  60
  61         hcd->rsrc_start = pdev->resource[0].start;
  62         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
  63         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  64                 usb_put_hcd(hcd);
  65                 retval = -EBUSY;
  66                 goto err1;
  67         }
  68
  69         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  70         if (hcd->regs == NULL) {
  71                 pr_debug("ioremap failed");
  72                 retval = -ENOMEM;
  73                 goto err2;
  74         }
  75
  76         usb_host_clock = clk_get(&pdev->dev, "usb_host");
  77         ep93xx_start_hc(&pdev->dev);
  78
  79         ohci_hcd_init(hcd_to_ohci(hcd));
  80
  81         retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
  82         if (retval == 0)
  83                 return retval;
  84
  85         ep93xx_stop_hc(&pdev->dev);
  86         iounmap(hcd->regs);
  87 err2:
  88         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  89 err1:
  90         usb_put_hcd(hcd);
  91
  92         return retval;
  93 }
  94
  95 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
  96                         struct platform_device *pdev)
  97 {
  98         usb_remove_hcd(hcd);
  99         ep93xx_stop_hc(&pdev->dev);
 100         clk_put(usb_host_clock);
 101         iounmap(hcd->regs);
 102         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 103         usb_put_hcd(hcd);
 104 }
 105
 106 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
 107 {
 108         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 109         int ret;
 110
 111         if ((ret = ohci_init(ohci)) < 0)
 112                 return ret;
 113
 114         if ((ret = ohci_run(ohci)) < 0) {
 115                 err("can't start %s", hcd->self.bus_name);
 116                 ohci_stop(hcd);
 117                 return ret;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static struct hc_driver ohci_ep93xx_hc_driver = {
 124         .description            = hcd_name,
 125         .product_desc           = "EP93xx OHCI",
 126         .hcd_priv_size          = sizeof(struct ohci_hcd),
 127         .irq                    = ohci_irq,
 128         .flags                  = HCD_USB11 | HCD_MEMORY,
 129         .start                  = ohci_ep93xx_start,
 130         .stop                   = ohci_stop,
 131         .urb_enqueue            = ohci_urb_enqueue,
 132         .urb_dequeue            = ohci_urb_dequeue,
 133         .endpoint_disable       = ohci_endpoint_disable,
 134         .get_frame_number       = ohci_get_frame,
 135         .hub_status_data        = ohci_hub_status_data,
 136         .hub_control            = ohci_hub_control,
 137 #ifdef CONFIG_PM
 138         .bus_suspend            = ohci_bus_suspend,
 139         .bus_resume             = ohci_bus_resume,
 140 #endif
 141         .start_port_reset       = ohci_start_port_reset,
 142 };
 143
 144 extern int usb_disabled(void);
 145
 146 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
 147 {
 148         int ret;
 149
 150         ret = -ENODEV;
 151         if (!usb_disabled())
 152                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
 153
 154         return ret;
 155 }
 156
 157 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 158 {
 159         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 160
 161         usb_hcd_ep93xx_remove(hcd, pdev);
 162
 163         return 0;
 164 }
 165
 166 #ifdef CONFIG_PM
 167 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 168 {
 169         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 170         struct ochi_hcd *ohci = hcd_to_ohci(hcd);
 171
 172         if (time_before(jiffies, ohci->next_statechange))
 173                 msleep(5);
 174         ohci->next_statechange = jiffies;
 175
 176         ep93xx_stop_hc(&pdev->dev);
 177         hcd->state = HC_STATE_SUSPENDED;
 178         pdev->dev.power.power_state = PMSG_SUSPEND;
 179
 180         return 0;
 181 }
 182
 183 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 184 {
 185         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 186         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 187         int status;
 188
 189         if (time_before(jiffies, ohci->next_statechange))
 190                 msleep(5);
 191         ohci->next_statechange = jiffies;
 192
 193         ep93xx_start_hc(&pdev->dev);
 194         pdev->dev.power.power_state = PMSG_ON;
 195         usb_hcd_resume_root_hub(hcd);
 196
 197         return 0;
 198 }
 199 #endif
 200
 201
 202 static struct platform_driver ohci_hcd_ep93xx_driver = {
 203         .probe          = ohci_hcd_ep93xx_drv_probe,
 204         .remove         = ohci_hcd_ep93xx_drv_remove,
 205 #ifdef CONFIG_PM
 206         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 207         .resume         = ohci_hcd_ep93xx_drv_resume,
 208 #endif
 209         .driver         = {
 210                 .name   = "ep93xx-ohci",
 211         },
 212 };
 213
 214 static int __init ohci_hcd_ep93xx_init(void)
 215 {
 216         return platform_driver_register(&ohci_hcd_ep93xx_driver);
 217 }
 218
 219 static void __exit ohci_hcd_ep93xx_cleanup(void)
 220 {
 221         platform_driver_unregister(&ohci_hcd_ep93xx_driver);
 222 }
 223
 224 module_init(ohci_hcd_ep93xx_init);
 225 module_exit(ohci_hcd_ep93xx_cleanup);