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                 dev_dbg(&pdev->dev, "resource[1] is not IORESOURCE_IRQ\n");
  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                 dev_dbg(&pdev->dev, "ioremap failed\n");
  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                 dev_dbg(&pdev->dev, "clk_get failed\n");
  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, 0);
  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 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                 dev_err(hcd->self.controller, "can't start %s\n",
 120                         hcd->self.bus_name);
 121                 ohci_stop(hcd);
 122                 return ret;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static struct hc_driver ohci_ep93xx_hc_driver = {
 129         .description            = hcd_name,
 130         .product_desc           = "EP93xx OHCI",
 131         .hcd_priv_size          = sizeof(struct ohci_hcd),
 132         .irq                    = ohci_irq,
 133         .flags                  = HCD_USB11 | HCD_MEMORY,
 134         .start                  = ohci_ep93xx_start,
 135         .stop                   = ohci_stop,
 136         .shutdown               = ohci_shutdown,
 137         .urb_enqueue            = ohci_urb_enqueue,
 138         .urb_dequeue            = ohci_urb_dequeue,
 139         .endpoint_disable       = ohci_endpoint_disable,
 140         .get_frame_number       = ohci_get_frame,
 141         .hub_status_data        = ohci_hub_status_data,
 142         .hub_control            = ohci_hub_control,
 143 #ifdef CONFIG_PM
 144         .bus_suspend            = ohci_bus_suspend,
 145         .bus_resume             = ohci_bus_resume,
 146 #endif
 147         .start_port_reset       = ohci_start_port_reset,
 148 };
 149
 150 extern int usb_disabled(void);
 151
 152 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
 153 {
 154         int ret;
 155
 156         ret = -ENODEV;
 157         if (!usb_disabled())
 158                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
 159
 160         return ret;
 161 }
 162
 163 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 164 {
 165         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 166
 167         usb_hcd_ep93xx_remove(hcd, pdev);
 168
 169         return 0;
 170 }
 171
 172 #ifdef CONFIG_PM
 173 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 174 {
 175         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 176         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 177
 178         if (time_before(jiffies, ohci->next_statechange))
 179                 msleep(5);
 180         ohci->next_statechange = jiffies;
 181
 182         ep93xx_stop_hc(&pdev->dev);
 183         return 0;
 184 }
 185
 186 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 187 {
 188         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 189         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 190
 191         if (time_before(jiffies, ohci->next_statechange))
 192                 msleep(5);
 193         ohci->next_statechange = jiffies;
 194
 195         ep93xx_start_hc(&pdev->dev);
 196
 197         ohci_resume(hcd, false);
 198         return 0;
 199 }
 200 #endif
 201
 202
 203 static struct platform_driver ohci_hcd_ep93xx_driver = {
 204         .probe          = ohci_hcd_ep93xx_drv_probe,
 205         .remove         = ohci_hcd_ep93xx_drv_remove,
 206         .shutdown       = usb_hcd_platform_shutdown,
 207 #ifdef CONFIG_PM
 208         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 209         .resume         = ohci_hcd_ep93xx_drv_resume,
 210 #endif
 211         .driver         = {
 212                 .name   = "ep93xx-ohci",
 213                 .owner  = THIS_MODULE,
 214         },
 215 };
 216
 217 MODULE_ALIAS("platform:ep93xx-ohci");