LXR linux/drivers/usb/chipidea/ci_hdrc

   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
  21struct ci_hdrc_usb2_priv {
  22        struct platform_device  *ci_pdev;
  23        struct clk              *clk;
  24};
  25
  26static const struct ci_hdrc_platform_data ci_default_pdata = {
  27        .capoffset      = DEF_CAPOFFSET,
  28        .flags          = CI_HDRC_DISABLE_STREAMING,
  29};
  30
  31static const struct ci_hdrc_platform_data ci_zynq_pdata = {
  32        .capoffset      = DEF_CAPOFFSET,
  33};
  34
  35static 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
  40static 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};
  46MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
  47
  48static 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
 103clk_err:
 104        clk_disable_unprepare(priv->clk);
 105        return ret;
 106}
 107
 108static 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
 119static 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};
 127module_platform_driver(ci_hdrc_usb2_driver);
 128
 129MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
 130MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 131MODULE_LICENSE("GPL");
 132