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 = otg_io_read(udc->transceiver, ULPI_FUNC_CTRL);
  41                 val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
  42                 val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
  43                 otg_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         if (ret < 0) {
  84                 dev_err(&pdev->dev, "udc_probe failed\n");
  85                 goto iounmap;
  86         }
  87
  88         irq = platform_get_irq(pdev, 0);
  89         if (irq < 0) {
  90                 dev_err(&pdev->dev, "IRQ not found\n");
  91                 ret = -ENXIO;
  92                 goto udc_remove;
  93         }
  94
  95         ret = request_irq(irq, msm_udc_irq, IRQF_SHARED, pdev->name, pdev);
  96         if (ret < 0) {
  97                 dev_err(&pdev->dev, "request_irq failed\n");
  98                 goto udc_remove;
  99         }
 100
 101         pm_runtime_no_callbacks(&pdev->dev);
 102         pm_runtime_enable(&pdev->dev);
 103
 104         return 0;
 105
 106 udc_remove:
 107         udc_remove();
 108 iounmap:
 109         iounmap(regs);
 110
 111         return ret;
 112 }
 113
 114 static struct platform_driver ci13xxx_msm_driver = {
 115         .probe = ci13xxx_msm_probe,
 116         .driver = { .name = "msm_hsusb", },
 117 };
 118 MODULE_ALIAS("platform:msm_hsusb");
 119
 120 static int __init ci13xxx_msm_init(void)
 121 {
 122         return platform_driver_register(&ci13xxx_msm_driver);
 123 }
 124 module_init(ci13xxx_msm_init);