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/dma-mapping.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/hcd.h>
  22
  23 #include "ehci.h"
  24
  25 /* enable phy0 and phy1 for w90p910 */
  26 #define ENPHY           (0x01<<8)
  27 #define PHY0_CTR        (0xA4)
  28 #define PHY1_CTR        (0xA8)
  29
  30 #define DRIVER_DESC "EHCI w90x900 driver"
  31
  32 static const char hcd_name[] = "ehci-w90x900 ";
  33
  34 static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
  35
  36 static int ehci_w90x900_probe(struct platform_device *pdev)
  37 {
  38         struct usb_hcd *hcd;
  39         struct ehci_hcd *ehci;
  40         struct resource *res;
  41         int retval = 0, irq;
  42         unsigned long val;
  43
  44         hcd = usb_create_hcd(&ehci_w90x900_hc_driver,
  45                         &pdev->dev, "w90x900 EHCI");
  46         if (!hcd) {
  47                 retval = -ENOMEM;
  48                 goto err1;
  49         }
  50
  51         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  52         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  53         if (IS_ERR(hcd->regs)) {
  54                 retval = PTR_ERR(hcd->regs);
  55                 goto err2;
  56         }
  57         hcd->rsrc_start = res->start;
  58         hcd->rsrc_len = resource_size(res);
  59
  60         ehci = hcd_to_ehci(hcd);
  61         ehci->caps = hcd->regs;
  62         ehci->regs = hcd->regs +
  63                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  64
  65         /* enable PHY 0,1,the regs only apply to w90p910
  66          *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
  67          *  w90p910 IC relative to ehci->regs.
  68          */
  69         val = __raw_readl(ehci->regs+PHY0_CTR);
  70         val |= ENPHY;
  71         __raw_writel(val, ehci->regs+PHY0_CTR);
  72
  73         val = __raw_readl(ehci->regs+PHY1_CTR);
  74         val |= ENPHY;
  75         __raw_writel(val, ehci->regs+PHY1_CTR);
  76
  77         irq = platform_get_irq(pdev, 0);
  78         if (irq < 0) {
  79                 retval = irq;
  80                 goto err2;
  81         }
  82
  83         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  84         if (retval != 0)
  85                 goto err2;
  86
  87         device_wakeup_enable(hcd->self.controller);
  88         return retval;
  89 err2:
  90         usb_put_hcd(hcd);
  91 err1:
  92         return retval;
  93 }
  94
  95 static int ehci_w90x900_remove(struct platform_device *pdev)
  96 {
  97         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  98
  99         usb_remove_hcd(hcd);
 100         usb_put_hcd(hcd);
 101
 102         return 0;
 103 }
 104
 105 static struct platform_driver ehci_hcd_w90x900_driver = {
 106         .probe  = ehci_w90x900_probe,
 107         .remove = ehci_w90x900_remove,
 108         .driver = {
 109                 .name = "w90x900-ehci",
 110         },
 111 };
 112
 113 static int __init ehci_w90X900_init(void)
 114 {
 115         if (usb_disabled())
 116                 return -ENODEV;
 117
 118         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 119
 120         ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
 121         return platform_driver_register(&ehci_hcd_w90x900_driver);
 122 }
 123 module_init(ehci_w90X900_init);
 124
 125 static void __exit ehci_w90X900_cleanup(void)
 126 {
 127         platform_driver_unregister(&ehci_hcd_w90x900_driver);
 128 }
 129 module_exit(ehci_w90X900_cleanup);
 130
 131 MODULE_DESCRIPTION(DRIVER_DESC);
 132 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 133 MODULE_ALIAS("platform:w90p910-ehci");
 134 MODULE_LICENSE("GPL v2");