kernel/drivers/usb/chipidea/ci_hdrc_usb2.c

   1 /*
   2  * Copyright (C) 2014 Marvell Technology Group Ltd.
   3  *
   4  * Antoine Tenart <antoine.tenart@free-electrons.com>
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/usb/chipidea.h>
  18 #include <linux/usb/hcd.h>
  19 #include <linux/usb/ulpi.h>
  20
  21 #include "ci.h"
  22
  23 struct ci_hdrc_usb2_priv {
  24         struct platform_device  *ci_pdev;
  25         struct clk              *clk;
  26 };
  27
  28 static struct ci_hdrc_platform_data ci_default_pdata = {
  29         .capoffset      = DEF_CAPOFFSET,
  30         .flags          = CI_HDRC_DISABLE_STREAMING,
  31 };
  32
  33 static int ci_hdrc_usb2_probe(struct platform_device *pdev)
  34 {
  35         struct device *dev = &pdev->dev;
  36         struct ci_hdrc_usb2_priv *priv;
  37         struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
  38         int ret;
  39
  40         if (!ci_pdata)
  41                 ci_pdata = &ci_default_pdata;
  42
  43         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  44         if (!priv)
  45                 return -ENOMEM;
  46
  47         priv->clk = devm_clk_get(dev, NULL);
  48         if (!IS_ERR(priv->clk)) {
  49                 ret = clk_prepare_enable(priv->clk);
  50                 if (ret) {
  51                         dev_err(dev, "failed to enable the clock: %d\n", ret);
  52                         return ret;
  53                 }
  54         }
  55
  56         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
  57         if (ret)
  58                 goto clk_err;
  59
  60         ci_pdata->name = dev_name(dev);
  61
  62         priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
  63                                            pdev->num_resources, ci_pdata);
  64         if (IS_ERR(priv->ci_pdev)) {
  65                 ret = PTR_ERR(priv->ci_pdev);
  66                 if (ret != -EPROBE_DEFER)
  67                         dev_err(dev,
  68                                 "failed to register ci_hdrc platform device: %d\n",
  69                                 ret);
  70                 goto clk_err;
  71         }
  72
  73         platform_set_drvdata(pdev, priv);
  74
  75         pm_runtime_no_callbacks(dev);
  76         pm_runtime_enable(dev);
  77
  78         return 0;
  79
  80 clk_err:
  81         if (!IS_ERR(priv->clk))
  82                 clk_disable_unprepare(priv->clk);
  83         return ret;
  84 }
  85
  86 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
  87 {
  88         struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
  89
  90         pm_runtime_disable(&pdev->dev);
  91         ci_hdrc_remove_device(priv->ci_pdev);
  92         clk_disable_unprepare(priv->clk);
  93
  94         return 0;
  95 }
  96
  97 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
  98         { .compatible = "chipidea,usb2" },
  99         { }
 100 };
 101 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
 102
 103 static struct platform_driver ci_hdrc_usb2_driver = {
 104         .probe  = ci_hdrc_usb2_probe,
 105         .remove = ci_hdrc_usb2_remove,
 106         .driver = {
 107                 .name           = "chipidea-usb2",
 108                 .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
 109         },
 110 };
 111 module_platform_driver(ci_hdrc_usb2_driver);
 112
 113 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
 114 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 115 MODULE_LICENSE("GPL");