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 usb_w90x900_probe(const struct hc_driver *driver,
  37                       struct platform_device *pdev)
  38 {
  39         struct usb_hcd *hcd;
  40         struct ehci_hcd *ehci;
  41         struct resource *res;
  42         int retval = 0, irq;
  43         unsigned long val;
  44
  45
  46         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  47         if (!res) {
  48                 retval = -ENXIO;
  49                 goto err1;
  50         }
  51
  52         hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
  53         if (!hcd) {
  54                 retval = -ENOMEM;
  55                 goto err1;
  56         }
  57
  58         hcd->rsrc_start = res->start;
  59         hcd->rsrc_len = resource_size(res);
  60
  61         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  62         if (IS_ERR(hcd->regs)) {
  63                 retval = PTR_ERR(hcd->regs);
  64                 goto err2;
  65         }
  66
  67         ehci = hcd_to_ehci(hcd);
  68         ehci->caps = hcd->regs;
  69         ehci->regs = hcd->regs +
  70                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  71
  72         /* enable PHY 0,1,the regs only apply to w90p910
  73         *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
  74         *  w90p910 IC relative to ehci->regs.
  75         */
  76         val = __raw_readl(ehci->regs+PHY0_CTR);
  77         val |= ENPHY;
  78         __raw_writel(val, ehci->regs+PHY0_CTR);
  79
  80         val = __raw_readl(ehci->regs+PHY1_CTR);
  81         val |= ENPHY;
  82         __raw_writel(val, ehci->regs+PHY1_CTR);
  83
  84         irq = platform_get_irq(pdev, 0);
  85         if (irq < 0)
  86                 goto err2;
  87
  88         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  89         if (retval != 0)
  90                 goto err2;
  91
  92         device_wakeup_enable(hcd->self.controller);
  93         return retval;
  94 err2:
  95         usb_put_hcd(hcd);
  96 err1:
  97         return retval;
  98 }
  99
 100 static void usb_w90x900_remove(struct usb_hcd *hcd,
 101                         struct platform_device *pdev)
 102 {
 103         usb_remove_hcd(hcd);
 104         usb_put_hcd(hcd);
 105 }
 106
 107 static int ehci_w90x900_probe(struct platform_device *pdev)
 108 {
 109         if (usb_disabled())
 110                 return -ENODEV;
 111
 112         return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
 113 }
 114
 115 static int ehci_w90x900_remove(struct platform_device *pdev)
 116 {
 117         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 118
 119         usb_w90x900_remove(hcd, pdev);
 120
 121         return 0;
 122 }
 123
 124 static struct platform_driver ehci_hcd_w90x900_driver = {
 125         .probe  = ehci_w90x900_probe,
 126         .remove = ehci_w90x900_remove,
 127         .driver = {
 128                 .name = "w90x900-ehci",
 129                 .owner = THIS_MODULE,
 130         },
 131 };
 132
 133 static int __init ehci_w90X900_init(void)
 134 {
 135         if (usb_disabled())
 136                 return -ENODEV;
 137
 138         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 139
 140         ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
 141         return platform_driver_register(&ehci_hcd_w90x900_driver);
 142 }
 143 module_init(ehci_w90X900_init);
 144
 145 static void __exit ehci_w90X900_cleanup(void)
 146 {
 147         platform_driver_unregister(&ehci_hcd_w90x900_driver);
 148 }
 149 module_exit(ehci_w90X900_cleanup);
 150
 151 MODULE_DESCRIPTION(DRIVER_DESC);
 152 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 153 MODULE_ALIAS("platform:w90p910-ehci");
 154 MODULE_LICENSE("GPL v2");