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         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  62                 retval = -EBUSY;
  63                 goto err2;
  64         }
  65
  66         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  67         if (hcd->regs == NULL) {
  68                 retval = -EFAULT;
  69                 goto err3;
  70         }
  71
  72         ehci = hcd_to_ehci(hcd);
  73         ehci->caps = hcd->regs;
  74         ehci->regs = hcd->regs +
  75                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  76
  77         /* enable PHY 0,1,the regs only apply to w90p910
  78         *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
  79         *  w90p910 IC relative to ehci->regs.
  80         */
  81         val = __raw_readl(ehci->regs+PHY0_CTR);
  82         val |= ENPHY;
  83         __raw_writel(val, ehci->regs+PHY0_CTR);
  84
  85         val = __raw_readl(ehci->regs+PHY1_CTR);
  86         val |= ENPHY;
  87         __raw_writel(val, ehci->regs+PHY1_CTR);
  88
  89         irq = platform_get_irq(pdev, 0);
  90         if (irq < 0)
  91                 goto err4;
  92
  93         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  94         if (retval != 0)
  95                 goto err4;
  96
  97         return retval;
  98 err4:
  99         iounmap(hcd->regs);
 100 err3:
 101         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 102 err2:
 103         usb_put_hcd(hcd);
 104 err1:
 105         return retval;
 106 }
 107
 108 static void usb_w90x900_remove(struct usb_hcd *hcd,
 109                         struct platform_device *pdev)
 110 {
 111         usb_remove_hcd(hcd);
 112         iounmap(hcd->regs);
 113         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 114         usb_put_hcd(hcd);
 115 }
 116
 117 static int ehci_w90x900_probe(struct platform_device *pdev)
 118 {
 119         if (usb_disabled())
 120                 return -ENODEV;
 121
 122         return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
 123 }
 124
 125 static int ehci_w90x900_remove(struct platform_device *pdev)
 126 {
 127         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 128
 129         usb_w90x900_remove(hcd, pdev);
 130
 131         return 0;
 132 }
 133
 134 static struct platform_driver ehci_hcd_w90x900_driver = {
 135         .probe  = ehci_w90x900_probe,
 136         .remove = ehci_w90x900_remove,
 137         .driver = {
 138                 .name = "w90x900-ehci",
 139                 .owner = THIS_MODULE,
 140         },
 141 };
 142
 143 static int __init ehci_w90X900_init(void)
 144 {
 145         if (usb_disabled())
 146                 return -ENODEV;
 147
 148         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 149
 150         ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
 151         return platform_driver_register(&ehci_hcd_w90x900_driver);
 152 }
 153 module_init(ehci_w90X900_init);
 154
 155 static void __exit ehci_w90X900_cleanup(void)
 156 {
 157         platform_driver_unregister(&ehci_hcd_w90x900_driver);
 158 }
 159 module_exit(ehci_w90X900_cleanup);
 160
 161 MODULE_DESCRIPTION(DRIVER_DESC);
 162 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 163 MODULE_ALIAS("platform:w90p910-ehci");
 164 MODULE_LICENSE("GPL v2");