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 static struct clk *usb_host_clock;
  32
  33 static void ep93xx_start_hc(struct device *dev)
  34 {
  35         clk_enable(usb_host_clock);
  36 }
  37
  38 static void ep93xx_stop_hc(struct device *dev)
  39 {
  40         clk_disable(usb_host_clock);
  41 }
  42
  43 static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
  44                          struct platform_device *pdev)
  45 {
  46         int retval;
  47         struct usb_hcd *hcd;
  48
  49         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
  50                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  51                 return -ENOMEM;
  52         }
  53
  54         hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
  55         if (hcd == NULL)
  56                 return -ENOMEM;
  57
  58         hcd->rsrc_start = pdev->resource[0].start;
  59         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
  60         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  61                 usb_put_hcd(hcd);
  62                 retval = -EBUSY;
  63                 goto err1;
  64         }
  65
  66         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  67         if (hcd->regs == NULL) {
  68                 pr_debug("ioremap failed");
  69                 retval = -ENOMEM;
  70                 goto err2;
  71         }
  72
  73         usb_host_clock = clk_get(&pdev->dev, "usb_host");
  74         ep93xx_start_hc(&pdev->dev);
  75
  76         ohci_hcd_init(hcd_to_ohci(hcd));
  77
  78         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
  79         if (retval == 0)
  80                 return retval;
  81
  82         ep93xx_stop_hc(&pdev->dev);
  83         iounmap(hcd->regs);
  84 err2:
  85         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  86 err1:
  87         usb_put_hcd(hcd);
  88
  89         return retval;
  90 }
  91
  92 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
  93                         struct platform_device *pdev)
  94 {
  95         usb_remove_hcd(hcd);
  96         ep93xx_stop_hc(&pdev->dev);
  97         clk_put(usb_host_clock);
  98         iounmap(hcd->regs);
  99         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 100         usb_put_hcd(hcd);
 101 }
 102
 103 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
 104 {
 105         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 106         int ret;
 107
 108         if ((ret = ohci_init(ohci)) < 0)
 109                 return ret;
 110
 111         if ((ret = ohci_run(ohci)) < 0) {
 112                 err("can't start %s", hcd->self.bus_name);
 113                 ohci_stop(hcd);
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static struct hc_driver ohci_ep93xx_hc_driver = {
 121         .description            = hcd_name,
 122         .product_desc           = "EP93xx OHCI",
 123         .hcd_priv_size          = sizeof(struct ohci_hcd),
 124         .irq                    = ohci_irq,
 125         .flags                  = HCD_USB11 | HCD_MEMORY,
 126         .start                  = ohci_ep93xx_start,
 127         .stop                   = ohci_stop,
 128         .shutdown               = ohci_shutdown,
 129         .urb_enqueue            = ohci_urb_enqueue,
 130         .urb_dequeue            = ohci_urb_dequeue,
 131         .endpoint_disable       = ohci_endpoint_disable,
 132         .get_frame_number       = ohci_get_frame,
 133         .hub_status_data        = ohci_hub_status_data,
 134         .hub_control            = ohci_hub_control,
 135 #ifdef CONFIG_PM
 136         .bus_suspend            = ohci_bus_suspend,
 137         .bus_resume             = ohci_bus_resume,
 138 #endif
 139         .start_port_reset       = ohci_start_port_reset,
 140 };
 141
 142 extern int usb_disabled(void);
 143
 144 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
 145 {
 146         int ret;
 147
 148         ret = -ENODEV;
 149         if (!usb_disabled())
 150                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
 151
 152         return ret;
 153 }
 154
 155 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 156 {
 157         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 158
 159         usb_hcd_ep93xx_remove(hcd, pdev);
 160
 161         return 0;
 162 }
 163
 164 #ifdef CONFIG_PM
 165 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 166 {
 167         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 168         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 169
 170         if (time_before(jiffies, ohci->next_statechange))
 171                 msleep(5);
 172         ohci->next_statechange = jiffies;
 173
 174         ep93xx_stop_hc(&pdev->dev);
 175         hcd->state = HC_STATE_SUSPENDED;
 176
 177         return 0;
 178 }
 179
 180 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 181 {
 182         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 183         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 184         int status;
 185
 186         if (time_before(jiffies, ohci->next_statechange))
 187                 msleep(5);
 188         ohci->next_statechange = jiffies;
 189
 190         ep93xx_start_hc(&pdev->dev);
 191
 192         ohci_finish_controller_resume(hcd);
 193         return 0;
 194 }
 195 #endif
 196
 197
 198 static struct platform_driver ohci_hcd_ep93xx_driver = {
 199         .probe          = ohci_hcd_ep93xx_drv_probe,
 200         .remove         = ohci_hcd_ep93xx_drv_remove,
 201         .shutdown       = usb_hcd_platform_shutdown,
 202 #ifdef CONFIG_PM
 203         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 204         .resume         = ohci_hcd_ep93xx_drv_resume,
 205 #endif
 206         .driver         = {
 207                 .name   = "ep93xx-ohci",
 208                 .owner  = THIS_MODULE,
 209         },
 210 };
 211
 212 MODULE_ALIAS("platform:ep93xx-ohci");