drivers/usb/chipidea/usbmisc_imx6q.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17
  18 #include "ci13xxx_imx.h"
  19
  20 #define USB_DEV_MAX 4
  21
  22 #define BM_OVER_CUR_DIS         BIT(7)
  23
  24 struct imx6q_usbmisc {
  25         void __iomem *base;
  26         spinlock_t lock;
  27         struct clk *clk;
  28         struct usbmisc_usb_device usbdev[USB_DEV_MAX];
  29 };
  30
  31 static struct imx6q_usbmisc *usbmisc;
  32
  33 static struct usbmisc_usb_device *get_usbdev(struct device *dev)
  34 {
  35         int i, ret;
  36
  37         for (i = 0; i < USB_DEV_MAX; i++) {
  38                 if (usbmisc->usbdev[i].dev == dev)
  39                         return &usbmisc->usbdev[i];
  40                 else if (!usbmisc->usbdev[i].dev)
  41                         break;
  42         }
  43
  44         if (i >= USB_DEV_MAX)
  45                 return ERR_PTR(-EBUSY);
  46
  47         ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
  48         if (ret)
  49                 return ERR_PTR(ret);
  50
  51         return &usbmisc->usbdev[i];
  52 }
  53
  54 static int usbmisc_imx6q_init(struct device *dev)
  55 {
  56
  57         struct usbmisc_usb_device *usbdev;
  58         unsigned long flags;
  59         u32 reg;
  60
  61         usbdev = get_usbdev(dev);
  62         if (IS_ERR(usbdev))
  63                 return PTR_ERR(usbdev);
  64
  65         if (usbdev->disable_oc) {
  66                 spin_lock_irqsave(&usbmisc->lock, flags);
  67                 reg = readl(usbmisc->base + usbdev->index * 4);
  68                 writel(reg | BM_OVER_CUR_DIS,
  69                         usbmisc->base + usbdev->index * 4);
  70                 spin_unlock_irqrestore(&usbmisc->lock, flags);
  71         }
  72
  73         return 0;
  74 }
  75
  76 static const struct usbmisc_ops imx6q_usbmisc_ops = {
  77         .init = usbmisc_imx6q_init,
  78 };
  79
  80 static const struct of_device_id usbmisc_imx6q_dt_ids[] = {
  81         { .compatible = "fsl,imx6q-usbmisc"},
  82         { /* sentinel */ }
  83 };
  84
  85 static int usbmisc_imx6q_probe(struct platform_device *pdev)
  86 {
  87         struct resource *res;
  88         struct imx6q_usbmisc *data;
  89         int ret;
  90
  91         if (usbmisc)
  92                 return -EBUSY;
  93
  94         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  95         if (!data)
  96                 return -ENOMEM;
  97
  98         spin_lock_init(&data->lock);
  99
 100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 101         data->base = devm_request_and_ioremap(&pdev->dev, res);
 102         if (!data->base)
 103                 return -EADDRNOTAVAIL;
 104
 105         data->clk = devm_clk_get(&pdev->dev, NULL);
 106         if (IS_ERR(data->clk)) {
 107                 dev_err(&pdev->dev,
 108                         "failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 109                 return PTR_ERR(data->clk);
 110         }
 111
 112         ret = clk_prepare_enable(data->clk);
 113         if (ret) {
 114                 dev_err(&pdev->dev,
 115                         "clk_prepare_enable failed, err=%d\n", ret);
 116                 return ret;
 117         }
 118
 119         ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
 120         if (ret) {
 121                 clk_disable_unprepare(data->clk);
 122                 return ret;
 123         }
 124
 125         usbmisc = data;
 126
 127         return 0;
 128 }
 129
 130 static int usbmisc_imx6q_remove(struct platform_device *pdev)
 131 {
 132         usbmisc_unset_ops(&imx6q_usbmisc_ops);
 133         clk_disable_unprepare(usbmisc->clk);
 134         return 0;
 135 }
 136
 137 static struct platform_driver usbmisc_imx6q_driver = {
 138         .probe = usbmisc_imx6q_probe,
 139         .remove = usbmisc_imx6q_remove,
 140         .driver = {
 141                 .name = "usbmisc_imx6q",
 142                 .owner = THIS_MODULE,
 143                 .of_match_table = usbmisc_imx6q_dt_ids,
 144          },
 145 };
 146
 147 int __init usbmisc_imx6q_drv_init(void)
 148 {
 149         return platform_driver_register(&usbmisc_imx6q_driver);
 150 }
 151 subsys_initcall(usbmisc_imx6q_drv_init);
 152
 153 void __exit usbmisc_imx6q_drv_exit(void)
 154 {
 155         platform_driver_unregister(&usbmisc_imx6q_driver);
 156 }
 157 module_exit(usbmisc_imx6q_drv_exit);
 158
 159 MODULE_ALIAS("platform:usbmisc-imx6q");
 160 MODULE_LICENSE("GPL v2");
 161 MODULE_DESCRIPTION("driver for imx6q usb non-core registers");
 162 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");