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 const 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 = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
  42                 *ci_pdata = ci_default_pdata;   /* struct copy */
  43         }
  44
  45         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  46         if (!priv)
  47                 return -ENOMEM;
  48
  49         priv->clk = devm_clk_get(dev, NULL);
  50         if (!IS_ERR(priv->clk)) {
  51                 ret = clk_prepare_enable(priv->clk);
  52                 if (ret) {
  53                         dev_err(dev, "failed to enable the clock: %d\n", ret);
  54                         return ret;
  55                 }
  56         }
  57
  58         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
  59         if (ret)
  60                 goto clk_err;
  61
  62         ci_pdata->name = dev_name(dev);
  63
  64         priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
  65                                            pdev->num_resources, ci_pdata);
  66         if (IS_ERR(priv->ci_pdev)) {
  67                 ret = PTR_ERR(priv->ci_pdev);
  68                 if (ret != -EPROBE_DEFER)
  69                         dev_err(dev,
  70                                 "failed to register ci_hdrc platform device: %d\n",
  71                                 ret);
  72                 goto clk_err;
  73         }
  74
  75         platform_set_drvdata(pdev, priv);
  76
  77         pm_runtime_no_callbacks(dev);
  78         pm_runtime_enable(dev);
  79
  80         return 0;
  81
  82 clk_err:
  83         if (!IS_ERR(priv->clk))
  84                 clk_disable_unprepare(priv->clk);
  85         return ret;
  86 }
  87
  88 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
  89 {
  90         struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
  91
  92         pm_runtime_disable(&pdev->dev);
  93         ci_hdrc_remove_device(priv->ci_pdev);
  94         clk_disable_unprepare(priv->clk);
  95
  96         return 0;
  97 }
  98
  99 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
 100         { .compatible = "chipidea,usb2" },
 101         { }
 102 };
 103 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
 104
 105 static struct platform_driver ci_hdrc_usb2_driver = {
 106         .probe  = ci_hdrc_usb2_probe,
 107         .remove = ci_hdrc_usb2_remove,
 108         .driver = {
 109                 .name           = "chipidea-usb2",
 110                 .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
 111         },
 112 };
 113 module_platform_driver(ci_hdrc_usb2_driver);
 114
 115 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
 116 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 117 MODULE_LICENSE("GPL");