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 <mach/hardware.h>
  32
  33 static struct clk *usb_host_clock;
  34
  35 static void ep93xx_start_hc(struct device *dev)
  36 {
  37         clk_enable(usb_host_clock);
  38 }
  39
  40 static void ep93xx_stop_hc(struct device *dev)
  41 {
  42         clk_disable(usb_host_clock);
  43 }
  44
  45 static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
  46                          struct platform_device *pdev)
  47 {
  48         int retval;
  49         struct usb_hcd *hcd;
  50
  51         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
  52                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  53                 return -ENOMEM;
  54         }
  55
  56         hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
  57         if (hcd == NULL)
  58                 return -ENOMEM;
  59
  60         hcd->rsrc_start = pdev->resource[0].start;
  61         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
  62         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  63                 usb_put_hcd(hcd);
  64                 retval = -EBUSY;
  65                 goto err1;
  66         }
  67
  68         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  69         if (hcd->regs == NULL) {
  70                 pr_debug("ioremap failed");
  71                 retval = -ENOMEM;
  72                 goto err2;
  73         }
  74
  75         usb_host_clock = clk_get(&pdev->dev, "usb_host");
  76         ep93xx_start_hc(&pdev->dev);
  77
  78         ohci_hcd_init(hcd_to_ohci(hcd));
  79
  80         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
  81         if (retval == 0)
  82                 return retval;
  83
  84         ep93xx_stop_hc(&pdev->dev);
  85         iounmap(hcd->regs);
  86 err2:
  87         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  88 err1:
  89         usb_put_hcd(hcd);
  90
  91         return retval;
  92 }
  93
  94 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
  95                         struct platform_device *pdev)
  96 {
  97         usb_remove_hcd(hcd);
  98         ep93xx_stop_hc(&pdev->dev);
  99         clk_put(usb_host_clock);
 100         iounmap(hcd->regs);
 101         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 102         usb_put_hcd(hcd);
 103 }
 104
 105 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
 106 {
 107         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 108         int ret;
 109
 110         if ((ret = ohci_init(ohci)) < 0)
 111                 return ret;
 112
 113         if ((ret = ohci_run(ohci)) < 0) {
 114                 err("can't start %s", hcd->self.bus_name);
 115                 ohci_stop(hcd);
 116                 return ret;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static struct hc_driver ohci_ep93xx_hc_driver = {
 123         .description            = hcd_name,
 124         .product_desc           = "EP93xx OHCI",
 125         .hcd_priv_size          = sizeof(struct ohci_hcd),
 126         .irq                    = ohci_irq,
 127         .flags                  = HCD_USB11 | HCD_MEMORY,
 128         .start                  = ohci_ep93xx_start,
 129         .stop                   = ohci_stop,
 130         .shutdown               = ohci_shutdown,
 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 ohci_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
 179         return 0;
 180 }
 181
 182 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 183 {
 184         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 185         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 186         int status;
 187
 188         if (time_before(jiffies, ohci->next_statechange))
 189                 msleep(5);
 190         ohci->next_statechange = jiffies;
 191
 192         ep93xx_start_hc(&pdev->dev);
 193
 194         ohci_finish_controller_resume(hcd);
 195         return 0;
 196 }
 197 #endif
 198
 199
 200 static struct platform_driver ohci_hcd_ep93xx_driver = {
 201         .probe          = ohci_hcd_ep93xx_drv_probe,
 202         .remove         = ohci_hcd_ep93xx_drv_remove,
 203         .shutdown       = usb_hcd_platform_shutdown,
 204 #ifdef CONFIG_PM
 205         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 206         .resume         = ohci_hcd_ep93xx_drv_resume,
 207 #endif
 208         .driver         = {
 209                 .name   = "ep93xx-ohci",
 210                 .owner  = THIS_MODULE,
 211         },
 212 };
 213
 214 MODULE_ALIAS("platform:ep93xx-ohci");