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