LXR linux/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
  32static const char hcd_name[] = "ehci-w90x900 ";
  33
  34static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
  35
  36static 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;
  89err2:
  90        usb_put_hcd(hcd);
  91err1:
  92        return retval;
  93}
  94
  95static 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
 102static 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
 110static 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
 119static 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
 127static 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}
 137module_init(ehci_w90X900_init);
 138
 139static void __exit ehci_w90X900_cleanup(void)
 140{
 141        platform_driver_unregister(&ehci_hcd_w90x900_driver);
 142}
 143module_exit(ehci_w90X900_cleanup);
 144
 145MODULE_DESCRIPTION(DRIVER_DESC);
 146MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 147MODULE_ALIAS("platform:w90p910-ehci");
 148MODULE_LICENSE("GPL v2");
 149