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/of_platform.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/usb/chipidea.h>
  19 #include <linux/usb/hcd.h>
  20 #include <linux/usb/ulpi.h>
  21
  22 #include "ci.h"
  23
  24 struct ci_hdrc_usb2_priv {
  25         struct platform_device  *ci_pdev;
  26         struct clk              *clk;
  27 };
  28
  29 static const struct ci_hdrc_platform_data ci_default_pdata = {
  30         .capoffset      = DEF_CAPOFFSET,
  31         .flags          = CI_HDRC_DISABLE_STREAMING,
  32 };
  33
  34 static struct ci_hdrc_platform_data ci_zynq_pdata = {
  35         .capoffset      = DEF_CAPOFFSET,
  36 };
  37
  38 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
  39         { .compatible = "chipidea,usb2"},
  40         { .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata},
  41         { }
  42 };
  43 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
  44
  45 static int ci_hdrc_usb2_probe(struct platform_device *pdev)
  46 {
  47         struct device *dev = &pdev->dev;
  48         struct ci_hdrc_usb2_priv *priv;
  49         struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
  50         int ret;
  51         const struct of_device_id *match;
  52
  53         if (!ci_pdata) {
  54                 ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
  55                 if (!ci_pdata)
  56                         return -ENOMEM;
  57                 *ci_pdata = ci_default_pdata;   /* struct copy */
  58         }
  59
  60         match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
  61         if (match && match->data) {
  62                 /* struct copy */
  63                 *ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
  64         }
  65
  66         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  67         if (!priv)
  68                 return -ENOMEM;
  69
  70         priv->clk = devm_clk_get(dev, NULL);
  71         if (!IS_ERR(priv->clk)) {
  72                 ret = clk_prepare_enable(priv->clk);
  73                 if (ret) {
  74                         dev_err(dev, "failed to enable the clock: %d\n", ret);
  75                         return ret;
  76                 }
  77         }
  78
  79         ci_pdata->name = dev_name(dev);
  80
  81         priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
  82                                            pdev->num_resources, ci_pdata);
  83         if (IS_ERR(priv->ci_pdev)) {
  84                 ret = PTR_ERR(priv->ci_pdev);
  85                 if (ret != -EPROBE_DEFER)
  86                         dev_err(dev,
  87                                 "failed to register ci_hdrc platform device: %d\n",
  88                                 ret);
  89                 goto clk_err;
  90         }
  91
  92         platform_set_drvdata(pdev, priv);
  93
  94         pm_runtime_no_callbacks(dev);
  95         pm_runtime_enable(dev);
  96
  97         return 0;
  98
  99 clk_err:
 100         if (!IS_ERR(priv->clk))
 101                 clk_disable_unprepare(priv->clk);
 102         return ret;
 103 }
 104
 105 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
 106 {
 107         struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
 108
 109         pm_runtime_disable(&pdev->dev);
 110         ci_hdrc_remove_device(priv->ci_pdev);
 111         clk_disable_unprepare(priv->clk);
 112
 113         return 0;
 114 }
 115
 116 static struct platform_driver ci_hdrc_usb2_driver = {
 117         .probe  = ci_hdrc_usb2_probe,
 118         .remove = ci_hdrc_usb2_remove,
 119         .driver = {
 120                 .name           = "chipidea-usb2",
 121                 .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
 122         },
 123 };
 124 module_platform_driver(ci_hdrc_usb2_driver);
 125
 126 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
 127 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 128 MODULE_LICENSE("GPL");