drivers/usb/gadget/ci13xxx_msm.c

   1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm_runtime.h>
  11 #include <linux/usb/msm_hsusb_hw.h>
  12 #include <linux/usb/ulpi.h>
  13
  14 #include "ci13xxx_udc.c"
  15
  16 #define MSM_USB_BASE    (udc->regs)
  17
  18 static irqreturn_t msm_udc_irq(int irq, void *data)
  19 {
  20         return udc_irq();
  21 }
  22
  23 static void ci13xxx_msm_notify_event(struct ci13xxx *udc, unsigned event)
  24 {
  25         struct device *dev = udc->gadget.dev.parent;
  26         int val;
  27
  28         switch (event) {
  29         case CI13XXX_CONTROLLER_RESET_EVENT:
  30                 dev_dbg(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
  31                 writel(0, USB_AHBBURST);
  32                 writel(0, USB_AHBMODE);
  33                 break;
  34         case CI13XXX_CONTROLLER_STOPPED_EVENT:
  35                 dev_dbg(dev, "CI13XXX_CONTROLLER_STOPPED_EVENT received\n");
  36                 /*
  37                  * Put the transceiver in non-driving mode. Otherwise host
  38                  * may not detect soft-disconnection.
  39                  */
  40                 val = usb_phy_io_read(udc->transceiver, ULPI_FUNC_CTRL);
  41                 val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
  42                 val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
  43                 usb_phy_io_write(udc->transceiver, val, ULPI_FUNC_CTRL);
  44                 break;
  45         default:
  46                 dev_dbg(dev, "unknown ci13xxx_udc event\n");
  47                 break;
  48         }
  49 }
  50
  51 static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
  52         .name                   = "ci13xxx_msm",
  53         .flags                  = CI13XXX_REGS_SHARED |
  54                                   CI13XXX_REQUIRE_TRANSCEIVER |
  55                                   CI13XXX_PULLUP_ON_VBUS |
  56                                   CI13XXX_DISABLE_STREAMING,
  57
  58         .notify_event           = ci13xxx_msm_notify_event,
  59 };
  60
  61 static int ci13xxx_msm_probe(struct platform_device *pdev)
  62 {
  63         struct resource *res;
  64         void __iomem *regs;
  65         int irq;
  66         int ret;
  67
  68         dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
  69
  70         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  71         if (!res) {
  72                 dev_err(&pdev->dev, "failed to get platform resource mem\n");
  73                 return -ENXIO;
  74         }
  75
  76         regs = ioremap(res->start, resource_size(res));
  77         if (!regs) {
  78                 dev_err(&pdev->dev, "ioremap failed\n");
  79                 return -ENOMEM;
  80         }
  81
  82         ret = udc_probe(&ci13xxx_msm_udc_driver, &pdev->dev, regs,
  83                         DEF_CAPOFFSET);
  84         if (ret < 0) {
  85                 dev_err(&pdev->dev, "udc_probe failed\n");
  86                 goto iounmap;
  87         }
  88
  89         irq = platform_get_irq(pdev, 0);
  90         if (irq < 0) {
  91                 dev_err(&pdev->dev, "IRQ not found\n");
  92                 ret = -ENXIO;
  93                 goto udc_remove;
  94         }
  95
  96         ret = request_irq(irq, msm_udc_irq, IRQF_SHARED, pdev->name, pdev);
  97         if (ret < 0) {
  98                 dev_err(&pdev->dev, "request_irq failed\n");
  99                 goto udc_remove;
 100         }
 101
 102         pm_runtime_no_callbacks(&pdev->dev);
 103         pm_runtime_enable(&pdev->dev);
 104
 105         return 0;
 106
 107 udc_remove:
 108         udc_remove();
 109 iounmap:
 110         iounmap(regs);
 111
 112         return ret;
 113 }
 114
 115 static struct platform_driver ci13xxx_msm_driver = {
 116         .probe = ci13xxx_msm_probe,
 117         .driver = { .name = "msm_hsusb", },
 118 };
 119 MODULE_ALIAS("platform:msm_hsusb");
 120
 121 static int __init ci13xxx_msm_init(void)
 122 {
 123         return platform_driver_register(&ci13xxx_msm_driver);
 124 }
 125 module_init(ci13xxx_msm_init);
 126
 127 MODULE_LICENSE("GPL v2");