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  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/usb/msm_hsusb_hw.h>
  23 #include <linux/usb/ulpi.h>
  24
  25 #include "ci13xxx_udc.c"
  26
  27 #define MSM_USB_BASE    (udc->regs)
  28
  29 static irqreturn_t msm_udc_irq(int irq, void *data)
  30 {
  31         return udc_irq();
  32 }
  33
  34 static void ci13xxx_msm_notify_event(struct ci13xxx *udc, unsigned event)
  35 {
  36         struct device *dev = udc->gadget.dev.parent;
  37         int val;
  38
  39         switch (event) {
  40         case CI13XXX_CONTROLLER_RESET_EVENT:
  41                 dev_dbg(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
  42                 writel(0, USB_AHBBURST);
  43                 writel(0, USB_AHBMODE);
  44                 break;
  45         case CI13XXX_CONTROLLER_STOPPED_EVENT:
  46                 dev_dbg(dev, "CI13XXX_CONTROLLER_STOPPED_EVENT received\n");
  47                 /*
  48                  * Put the transceiver in non-driving mode. Otherwise host
  49                  * may not detect soft-disconnection.
  50                  */
  51                 val = otg_io_read(udc->transceiver, ULPI_FUNC_CTRL);
  52                 val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
  53                 val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
  54                 otg_io_write(udc->transceiver, val, ULPI_FUNC_CTRL);
  55                 break;
  56         default:
  57                 dev_dbg(dev, "unknown ci13xxx_udc event\n");
  58                 break;
  59         }
  60 }
  61
  62 static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
  63         .name                   = "ci13xxx_msm",
  64         .flags                  = CI13XXX_REGS_SHARED |
  65                                   CI13XXX_REQUIRE_TRANSCEIVER |
  66                                   CI13XXX_PULLUP_ON_VBUS |
  67                                   CI13XXX_DISABLE_STREAMING,
  68
  69         .notify_event           = ci13xxx_msm_notify_event,
  70 };
  71
  72 static int ci13xxx_msm_probe(struct platform_device *pdev)
  73 {
  74         struct resource *res;
  75         void __iomem *regs;
  76         int irq;
  77         int ret;
  78
  79         dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
  80
  81         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  82         if (!res) {
  83                 dev_err(&pdev->dev, "failed to get platform resource mem\n");
  84                 return -ENXIO;
  85         }
  86
  87         regs = ioremap(res->start, resource_size(res));
  88         if (!regs) {
  89                 dev_err(&pdev->dev, "ioremap failed\n");
  90                 return -ENOMEM;
  91         }
  92
  93         ret = udc_probe(&ci13xxx_msm_udc_driver, &pdev->dev, regs);
  94         if (ret < 0) {
  95                 dev_err(&pdev->dev, "udc_probe failed\n");
  96                 goto iounmap;
  97         }
  98
  99         irq = platform_get_irq(pdev, 0);
 100         if (irq < 0) {
 101                 dev_err(&pdev->dev, "IRQ not found\n");
 102                 ret = -ENXIO;
 103                 goto udc_remove;
 104         }
 105
 106         ret = request_irq(irq, msm_udc_irq, IRQF_SHARED, pdev->name, pdev);
 107         if (ret < 0) {
 108                 dev_err(&pdev->dev, "request_irq failed\n");
 109                 goto udc_remove;
 110         }
 111
 112         pm_runtime_no_callbacks(&pdev->dev);
 113         pm_runtime_enable(&pdev->dev);
 114
 115         return 0;
 116
 117 udc_remove:
 118         udc_remove();
 119 iounmap:
 120         iounmap(regs);
 121
 122         return ret;
 123 }
 124
 125 static struct platform_driver ci13xxx_msm_driver = {
 126         .probe = ci13xxx_msm_probe,
 127         .driver = { .name = "msm_hsusb", },
 128 };
 129 MODULE_ALIAS("platform:msm_hsusb");
 130
 131 static int __init ci13xxx_msm_init(void)
 132 {
 133         return platform_driver_register(&ci13xxx_msm_driver);
 134 }
 135 module_init(ci13xxx_msm_init);