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                 dbg("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                 dbg("ioremap failed");
  69                 retval = -ENOMEM;
  70                 goto err2;
  71         }
  72
  73         usb_host_clock = clk_get(&pdev->dev, NULL);
  74         if (IS_ERR(usb_host_clock)) {
  75                 dbg("clk_get failed");
  76                 retval = PTR_ERR(usb_host_clock);
  77                 goto err3;
  78         }
  79
  80         ep93xx_start_hc(&pdev->dev);
  81
  82         ohci_hcd_init(hcd_to_ohci(hcd));
  83
  84         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
  85         if (retval == 0)
  86                 return retval;
  87
  88         ep93xx_stop_hc(&pdev->dev);
  89 err3:
  90         iounmap(hcd->regs);
  91 err2:
  92         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  93 err1:
  94         usb_put_hcd(hcd);
  95
  96         return retval;
  97 }
  98
  99 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
 100                         struct platform_device *pdev)
 101 {
 102         usb_remove_hcd(hcd);
 103         ep93xx_stop_hc(&pdev->dev);
 104         clk_put(usb_host_clock);
 105         iounmap(hcd->regs);
 106         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 107         usb_put_hcd(hcd);
 108 }
 109
 110 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
 111 {
 112         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 113         int ret;
 114
 115         if ((ret = ohci_init(ohci)) < 0)
 116                 return ret;
 117
 118         if ((ret = ohci_run(ohci)) < 0) {
 119                 err("can't start %s", hcd->self.bus_name);
 120                 ohci_stop(hcd);
 121                 return ret;
 122         }
 123
 124         return 0;
 125 }
 126
 127 static struct hc_driver ohci_ep93xx_hc_driver = {
 128         .description            = hcd_name,
 129         .product_desc           = "EP93xx OHCI",
 130         .hcd_priv_size          = sizeof(struct ohci_hcd),
 131         .irq                    = ohci_irq,
 132         .flags                  = HCD_USB11 | HCD_MEMORY,
 133         .start                  = ohci_ep93xx_start,
 134         .stop                   = ohci_stop,
 135         .shutdown               = ohci_shutdown,
 136         .urb_enqueue            = ohci_urb_enqueue,
 137         .urb_dequeue            = ohci_urb_dequeue,
 138         .endpoint_disable       = ohci_endpoint_disable,
 139         .get_frame_number       = ohci_get_frame,
 140         .hub_status_data        = ohci_hub_status_data,
 141         .hub_control            = ohci_hub_control,
 142 #ifdef CONFIG_PM
 143         .bus_suspend            = ohci_bus_suspend,
 144         .bus_resume             = ohci_bus_resume,
 145 #endif
 146         .start_port_reset       = ohci_start_port_reset,
 147 };
 148
 149 extern int usb_disabled(void);
 150
 151 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
 152 {
 153         int ret;
 154
 155         ret = -ENODEV;
 156         if (!usb_disabled())
 157                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
 158
 159         return ret;
 160 }
 161
 162 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 163 {
 164         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 165
 166         usb_hcd_ep93xx_remove(hcd, pdev);
 167
 168         return 0;
 169 }
 170
 171 #ifdef CONFIG_PM
 172 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 173 {
 174         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 175         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 176
 177         if (time_before(jiffies, ohci->next_statechange))
 178                 msleep(5);
 179         ohci->next_statechange = jiffies;
 180
 181         ep93xx_stop_hc(&pdev->dev);
 182         hcd->state = HC_STATE_SUSPENDED;
 183
 184         return 0;
 185 }
 186
 187 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 188 {
 189         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 190         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 191         int status;
 192
 193         if (time_before(jiffies, ohci->next_statechange))
 194                 msleep(5);
 195         ohci->next_statechange = jiffies;
 196
 197         ep93xx_start_hc(&pdev->dev);
 198
 199         ohci_finish_controller_resume(hcd);
 200         return 0;
 201 }
 202 #endif
 203
 204
 205 static struct platform_driver ohci_hcd_ep93xx_driver = {
 206         .probe          = ohci_hcd_ep93xx_drv_probe,
 207         .remove         = ohci_hcd_ep93xx_drv_remove,
 208         .shutdown       = usb_hcd_platform_shutdown,
 209 #ifdef CONFIG_PM
 210         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 211         .resume         = ohci_hcd_ep93xx_drv_resume,
 212 #endif
 213         .driver         = {
 214                 .name   = "ep93xx-ohci",
 215                 .owner  = THIS_MODULE,
 216         },
 217 };
 218
 219 MODULE_ALIAS("platform:ep93xx-ohci");