drivers/usb/chipidea/ci_hdrc_imx.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  * Copyright (C) 2012 Marek Vasut <marex@denx.de>
   4  * on behalf of DENX Software Engineering GmbH
   5  *
   6  * The code contained herein is licensed under the GNU General Public
   7  * License. You may obtain a copy of the GNU General Public License
   8  * Version 2 or later at the following locations:
   9  *
  10  * http://www.opensource.org/licenses/gpl-license.html
  11  * http://www.gnu.org/copyleft/gpl.html
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/of_gpio.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/usb/chipidea.h>
  21 #include <linux/clk.h>
  22
  23 #include "ci.h"
  24 #include "ci_hdrc_imx.h"
  25
  26 #define CI_HDRC_IMX_IMX28_WRITE_FIX BIT(0)
  27
  28 struct ci_hdrc_imx_platform_flag {
  29         unsigned int flags;
  30 };
  31
  32 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
  33 };
  34
  35 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
  36         .flags = CI_HDRC_IMX_IMX28_WRITE_FIX,
  37 };
  38
  39 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
  40         { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
  41         { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
  42         { /* sentinel */ }
  43 };
  44 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
  45
  46 struct ci_hdrc_imx_data {
  47         struct usb_phy *phy;
  48         struct platform_device *ci_pdev;
  49         struct clk *clk;
  50         struct imx_usbmisc_data *usbmisc_data;
  51 };
  52
  53 /* Common functions shared by usbmisc drivers */
  54
  55 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
  56 {
  57         struct platform_device *misc_pdev;
  58         struct device_node *np = dev->of_node;
  59         struct of_phandle_args args;
  60         struct imx_usbmisc_data *data;
  61         int ret;
  62
  63         /*
  64          * In case the fsl,usbmisc property is not present this device doesn't
  65          * need usbmisc. Return NULL (which is no error here)
  66          */
  67         if (!of_get_property(np, "fsl,usbmisc", NULL))
  68                 return NULL;
  69
  70         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  71         if (!data)
  72                 return ERR_PTR(-ENOMEM);
  73
  74         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  75                                         0, &args);
  76         if (ret) {
  77                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  78                         ret);
  79                 return ERR_PTR(ret);
  80         }
  81
  82         data->index = args.args[0];
  83
  84         misc_pdev = of_find_device_by_node(args.np);
  85         of_node_put(args.np);
  86
  87         if (!misc_pdev)
  88                 return ERR_PTR(-EPROBE_DEFER);
  89
  90         data->dev = &misc_pdev->dev;
  91
  92         if (of_find_property(np, "disable-over-current", NULL))
  93                 data->disable_oc = 1;
  94
  95         if (of_find_property(np, "external-vbus-divider", NULL))
  96                 data->evdo = 1;
  97
  98         return data;
  99 }
 100
 101 /* End of common functions shared by usbmisc drivers*/
 102
 103 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 104 {
 105         struct ci_hdrc_imx_data *data;
 106         struct ci_hdrc_platform_data pdata = {
 107                 .name           = dev_name(&pdev->dev),
 108                 .capoffset      = DEF_CAPOFFSET,
 109                 .flags          = CI_HDRC_REQUIRE_TRANSCEIVER |
 110                                   CI_HDRC_DISABLE_STREAMING,
 111         };
 112         int ret;
 113         const struct of_device_id *of_id =
 114                         of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 115         const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data;
 116
 117         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 118         if (!data) {
 119                 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n");
 120                 return -ENOMEM;
 121         }
 122
 123         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 124         if (IS_ERR(data->usbmisc_data))
 125                 return PTR_ERR(data->usbmisc_data);
 126
 127         data->clk = devm_clk_get(&pdev->dev, NULL);
 128         if (IS_ERR(data->clk)) {
 129                 dev_err(&pdev->dev,
 130                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 131                 return PTR_ERR(data->clk);
 132         }
 133
 134         ret = clk_prepare_enable(data->clk);
 135         if (ret) {
 136                 dev_err(&pdev->dev,
 137                         "Failed to prepare or enable clock, err=%d\n", ret);
 138                 return ret;
 139         }
 140
 141         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 142         if (IS_ERR(data->phy)) {
 143                 ret = PTR_ERR(data->phy);
 144                 /* Return -EINVAL if no usbphy is available */
 145                 if (ret == -ENODEV)
 146                         ret = -EINVAL;
 147                 goto err_clk;
 148         }
 149
 150         pdata.phy = data->phy;
 151
 152         if (imx_platform_flag->flags & CI_HDRC_IMX_IMX28_WRITE_FIX)
 153                 pdata.flags |= CI_HDRC_IMX28_WRITE_FIX;
 154
 155         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 156         if (ret)
 157                 goto err_clk;
 158
 159         if (data->usbmisc_data) {
 160                 ret = imx_usbmisc_init(data->usbmisc_data);
 161                 if (ret) {
 162                         dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n",
 163                                         ret);
 164                         goto err_clk;
 165                 }
 166         }
 167
 168         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 169                                 pdev->resource, pdev->num_resources,
 170                                 &pdata);
 171         if (IS_ERR(data->ci_pdev)) {
 172                 ret = PTR_ERR(data->ci_pdev);
 173                 dev_err(&pdev->dev,
 174                         "Can't register ci_hdrc platform device, err=%d\n",
 175                         ret);
 176                 goto err_clk;
 177         }
 178
 179         if (data->usbmisc_data) {
 180                 ret = imx_usbmisc_init_post(data->usbmisc_data);
 181                 if (ret) {
 182                         dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n",
 183                                         ret);
 184                         goto disable_device;
 185                 }
 186         }
 187
 188         platform_set_drvdata(pdev, data);
 189
 190         pm_runtime_no_callbacks(&pdev->dev);
 191         pm_runtime_enable(&pdev->dev);
 192
 193         return 0;
 194
 195 disable_device:
 196         ci_hdrc_remove_device(data->ci_pdev);
 197 err_clk:
 198         clk_disable_unprepare(data->clk);
 199         return ret;
 200 }
 201
 202 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 203 {
 204         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 205
 206         pm_runtime_disable(&pdev->dev);
 207         ci_hdrc_remove_device(data->ci_pdev);
 208         clk_disable_unprepare(data->clk);
 209
 210         return 0;
 211 }
 212
 213 static struct platform_driver ci_hdrc_imx_driver = {
 214         .probe = ci_hdrc_imx_probe,
 215         .remove = ci_hdrc_imx_remove,
 216         .driver = {
 217                 .name = "imx_usb",
 218                 .owner = THIS_MODULE,
 219                 .of_match_table = ci_hdrc_imx_dt_ids,
 220          },
 221 };
 222
 223 module_platform_driver(ci_hdrc_imx_driver);
 224
 225 MODULE_ALIAS("platform:imx-usb");
 226 MODULE_LICENSE("GPL v2");
 227 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 228 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 229 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");