drivers/usb/host/ehci-w90x900.c

   1 /*
   2  * linux/driver/usb/host/ehci-w90x900.c
   3  *
   4  * Copyright (c) 2008 Nuvoton technology corporation.
   5  *
   6  * Wan ZongShun <mcuos.com@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation;version 2 of the License.
  11  *
  12  */
  13
  14 #include <linux/platform_device.h>
  15
  16 /* enable phy0 and phy1 for w90p910 */
  17 #define ENPHY           (0x01<<8)
  18 #define PHY0_CTR        (0xA4)
  19 #define PHY1_CTR        (0xA8)
  20
  21 static int usb_w90x900_probe(const struct hc_driver *driver,
  22                       struct platform_device *pdev)
  23 {
  24         struct usb_hcd *hcd;
  25         struct ehci_hcd *ehci;
  26         struct resource *res;
  27         int retval = 0, irq;
  28         unsigned long val;
  29
  30
  31         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  32         if (!res) {
  33                 retval = -ENXIO;
  34                 goto err1;
  35         }
  36
  37         hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
  38         if (!hcd) {
  39                 retval = -ENOMEM;
  40                 goto err1;
  41         }
  42
  43         hcd->rsrc_start = res->start;
  44         hcd->rsrc_len = resource_size(res);
  45
  46         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  47                 retval = -EBUSY;
  48                 goto err2;
  49         }
  50
  51         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  52         if (hcd->regs == NULL) {
  53                 retval = -EFAULT;
  54                 goto err3;
  55         }
  56
  57         ehci = hcd_to_ehci(hcd);
  58         ehci->caps = hcd->regs;
  59         ehci->regs = hcd->regs +
  60                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  61
  62         /* enable PHY 0,1,the regs only apply to w90p910
  63         *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
  64         *  w90p910 IC relative to ehci->regs.
  65         */
  66         val = __raw_readl(ehci->regs+PHY0_CTR);
  67         val |= ENPHY;
  68         __raw_writel(val, ehci->regs+PHY0_CTR);
  69
  70         val = __raw_readl(ehci->regs+PHY1_CTR);
  71         val |= ENPHY;
  72         __raw_writel(val, ehci->regs+PHY1_CTR);
  73
  74         irq = platform_get_irq(pdev, 0);
  75         if (irq < 0)
  76                 goto err4;
  77
  78         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  79         if (retval != 0)
  80                 goto err4;
  81
  82         return retval;
  83 err4:
  84         iounmap(hcd->regs);
  85 err3:
  86         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  87 err2:
  88         usb_put_hcd(hcd);
  89 err1:
  90         return retval;
  91 }
  92
  93 static
  94 void usb_w90x900_remove(struct usb_hcd *hcd, struct platform_device *pdev)
  95 {
  96         usb_remove_hcd(hcd);
  97         iounmap(hcd->regs);
  98         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  99         usb_put_hcd(hcd);
 100 }
 101
 102 static const struct hc_driver ehci_w90x900_hc_driver = {
 103         .description = hcd_name,
 104         .product_desc = "Nuvoton w90x900 EHCI Host Controller",
 105         .hcd_priv_size = sizeof(struct ehci_hcd),
 106
 107         /*
 108          * generic hardware linkage
 109          */
 110         .irq = ehci_irq,
 111         .flags = HCD_USB2|HCD_MEMORY|HCD_BH,
 112
 113         /*
 114          * basic lifecycle operations
 115          */
 116         .reset = ehci_setup,
 117         .start = ehci_run,
 118
 119         .stop = ehci_stop,
 120         .shutdown = ehci_shutdown,
 121
 122         /*
 123          * managing i/o requests and associated device resources
 124          */
 125         .urb_enqueue = ehci_urb_enqueue,
 126         .urb_dequeue = ehci_urb_dequeue,
 127         .endpoint_disable = ehci_endpoint_disable,
 128         .endpoint_reset = ehci_endpoint_reset,
 129
 130         /*
 131          * scheduling support
 132          */
 133         .get_frame_number = ehci_get_frame,
 134
 135         /*
 136          * root hub support
 137          */
 138         .hub_status_data = ehci_hub_status_data,
 139         .hub_control = ehci_hub_control,
 140 #ifdef  CONFIG_PM
 141         .bus_suspend = ehci_bus_suspend,
 142         .bus_resume = ehci_bus_resume,
 143 #endif
 144         .relinquish_port        = ehci_relinquish_port,
 145         .port_handed_over       = ehci_port_handed_over,
 146
 147         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 148 };
 149
 150 static int ehci_w90x900_probe(struct platform_device *pdev)
 151 {
 152         if (usb_disabled())
 153                 return -ENODEV;
 154
 155         return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
 156 }
 157
 158 static int ehci_w90x900_remove(struct platform_device *pdev)
 159 {
 160         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 161
 162         usb_w90x900_remove(hcd, pdev);
 163
 164         return 0;
 165 }
 166
 167 static struct platform_driver ehci_hcd_w90x900_driver = {
 168         .probe  = ehci_w90x900_probe,
 169         .remove = ehci_w90x900_remove,
 170         .driver = {
 171                 .name = "w90x900-ehci",
 172                 .owner = THIS_MODULE,
 173         },
 174 };
 175
 176 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 177 MODULE_DESCRIPTION("w90p910 usb ehci driver!");
 178 MODULE_LICENSE("GPL");
 179 MODULE_ALIAS("platform:w90p910-ehci");