kernel/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         hcd = usb_create_hcd(driver, &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 void usb_w90x900_remove(struct usb_hcd *hcd,
  96                         struct platform_device *pdev)
  97 {
  98         usb_remove_hcd(hcd);
  99         usb_put_hcd(hcd);
 100 }
 101
 102 static int ehci_w90x900_probe(struct platform_device *pdev)
 103 {
 104         if (usb_disabled())
 105                 return -ENODEV;
 106
 107         return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
 108 }
 109
 110 static int ehci_w90x900_remove(struct platform_device *pdev)
 111 {
 112         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 113
 114         usb_w90x900_remove(hcd, pdev);
 115
 116         return 0;
 117 }
 118
 119 static struct platform_driver ehci_hcd_w90x900_driver = {
 120         .probe  = ehci_w90x900_probe,
 121         .remove = ehci_w90x900_remove,
 122         .driver = {
 123                 .name = "w90x900-ehci",
 124         },
 125 };
 126
 127 static int __init ehci_w90X900_init(void)
 128 {
 129         if (usb_disabled())
 130                 return -ENODEV;
 131
 132         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 133
 134         ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
 135         return platform_driver_register(&ehci_hcd_w90x900_driver);
 136 }
 137 module_init(ehci_w90X900_init);
 138
 139 static void __exit ehci_w90X900_cleanup(void)
 140 {
 141         platform_driver_unregister(&ehci_hcd_w90x900_driver);
 142 }
 143 module_exit(ehci_w90X900_cleanup);
 144
 145 MODULE_DESCRIPTION(DRIVER_DESC);
 146 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 147 MODULE_ALIAS("platform:w90p910-ehci");
 148 MODULE_LICENSE("GPL v2");