drivers/usb/chipidea/ci_hdrc_usb2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2014 Marvell Technology Group Ltd.
   4  *
   5  * Antoine Tenart <antoine.tenart@free-electrons.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/phy/phy.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/usb/chipidea.h>
  16 #include <linux/usb/hcd.h>
  17 #include <linux/usb/ulpi.h>
  18
  19 #include "ci.h"
  20
  21 struct ci_hdrc_usb2_priv {
  22         struct platform_device  *ci_pdev;
  23         struct clk              *clk;
  24 };
  25
  26 static const struct ci_hdrc_platform_data ci_default_pdata = {
  27         .capoffset      = DEF_CAPOFFSET,
  28         .flags          = CI_HDRC_DISABLE_STREAMING,
  29 };
  30
  31 static struct ci_hdrc_platform_data ci_zynq_pdata = {
  32         .capoffset      = DEF_CAPOFFSET,
  33 };
  34
  35 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
  36         { .compatible = "chipidea,usb2"},
  37         { .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata},
  38         { }
  39 };
  40 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
  41
  42 static int ci_hdrc_usb2_probe(struct platform_device *pdev)
  43 {
  44         struct device *dev = &pdev->dev;
  45         struct ci_hdrc_usb2_priv *priv;
  46         struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
  47         int ret;
  48         const struct of_device_id *match;
  49
  50         if (!ci_pdata) {
  51                 ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
  52                 if (!ci_pdata)
  53                         return -ENOMEM;
  54                 *ci_pdata = ci_default_pdata;   /* struct copy */
  55         }
  56
  57         match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
  58         if (match && match->data) {
  59                 /* struct copy */
  60                 *ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
  61         }
  62
  63         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  64         if (!priv)
  65                 return -ENOMEM;
  66
  67         priv->clk = devm_clk_get(dev, NULL);
  68         if (!IS_ERR(priv->clk)) {
  69                 ret = clk_prepare_enable(priv->clk);
  70                 if (ret) {
  71                         dev_err(dev, "failed to enable the clock: %d\n", ret);
  72                         return ret;
  73                 }
  74         }
  75
  76         ci_pdata->name = dev_name(dev);
  77
  78         priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
  79                                            pdev->num_resources, ci_pdata);
  80         if (IS_ERR(priv->ci_pdev)) {
  81                 ret = PTR_ERR(priv->ci_pdev);
  82                 if (ret != -EPROBE_DEFER)
  83                         dev_err(dev,
  84                                 "failed to register ci_hdrc platform device: %d\n",
  85                                 ret);
  86                 goto clk_err;
  87         }
  88
  89         platform_set_drvdata(pdev, priv);
  90
  91         pm_runtime_no_callbacks(dev);
  92         pm_runtime_enable(dev);
  93
  94         return 0;
  95
  96 clk_err:
  97         if (!IS_ERR(priv->clk))
  98                 clk_disable_unprepare(priv->clk);
  99         return ret;
 100 }
 101
 102 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
 103 {
 104         struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
 105
 106         pm_runtime_disable(&pdev->dev);
 107         ci_hdrc_remove_device(priv->ci_pdev);
 108         clk_disable_unprepare(priv->clk);
 109
 110         return 0;
 111 }
 112
 113 static struct platform_driver ci_hdrc_usb2_driver = {
 114         .probe  = ci_hdrc_usb2_probe,
 115         .remove = ci_hdrc_usb2_remove,
 116         .driver = {
 117                 .name           = "chipidea-usb2",
 118                 .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
 119         },
 120 };
 121 module_platform_driver(ci_hdrc_usb2_driver);
 122
 123 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
 124 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 125 MODULE_LICENSE("GPL");