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 device_node *np = dev->of_node;
  58         struct of_phandle_args args;
  59         struct imx_usbmisc_data *data;
  60         int ret;
  61
  62         /*
  63          * In case the fsl,usbmisc property is not present this device doesn't
  64          * need usbmisc. Return NULL (which is no error here)
  65          */
  66         if (!of_get_property(np, "fsl,usbmisc", NULL))
  67                 return NULL;
  68
  69         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  70         if (!data)
  71                 return ERR_PTR(-ENOMEM);
  72
  73         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  74                                         0, &args);
  75         if (ret) {
  76                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  77                         ret);
  78                 return ERR_PTR(ret);
  79         }
  80
  81         data->index = args.args[0];
  82         of_node_put(args.np);
  83
  84         if (of_find_property(np, "disable-over-current", NULL))
  85                 data->disable_oc = 1;
  86
  87         if (of_find_property(np, "external-vbus-divider", NULL))
  88                 data->evdo = 1;
  89
  90         return data;
  91 }
  92
  93 /* End of common functions shared by usbmisc drivers*/
  94
  95 static int ci_hdrc_imx_probe(struct platform_device *pdev)
  96 {
  97         struct ci_hdrc_imx_data *data;
  98         struct ci_hdrc_platform_data pdata = {
  99                 .name           = "ci_hdrc_imx",
 100                 .capoffset      = DEF_CAPOFFSET,
 101                 .flags          = CI_HDRC_REQUIRE_TRANSCEIVER |
 102                                   CI_HDRC_DISABLE_STREAMING,
 103         };
 104         int ret;
 105         const struct of_device_id *of_id =
 106                         of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 107         const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data;
 108
 109         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 110         if (!data) {
 111                 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n");
 112                 return -ENOMEM;
 113         }
 114
 115         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 116         if (IS_ERR(data->usbmisc_data))
 117                 return PTR_ERR(data->usbmisc_data);
 118
 119         data->clk = devm_clk_get(&pdev->dev, NULL);
 120         if (IS_ERR(data->clk)) {
 121                 dev_err(&pdev->dev,
 122                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 123                 return PTR_ERR(data->clk);
 124         }
 125
 126         ret = clk_prepare_enable(data->clk);
 127         if (ret) {
 128                 dev_err(&pdev->dev,
 129                         "Failed to prepare or enable clock, err=%d\n", ret);
 130                 return ret;
 131         }
 132
 133         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 134         if (IS_ERR(data->phy)) {
 135                 ret = PTR_ERR(data->phy);
 136                 goto err_clk;
 137         }
 138
 139         pdata.phy = data->phy;
 140
 141         if (imx_platform_flag->flags & CI_HDRC_IMX_IMX28_WRITE_FIX)
 142                 pdata.flags |= CI_HDRC_IMX28_WRITE_FIX;
 143
 144         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 145         if (ret)
 146                 goto err_clk;
 147
 148         if (data->usbmisc_data) {
 149                 ret = imx_usbmisc_init(data->usbmisc_data);
 150                 if (ret) {
 151                         dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n",
 152                                         ret);
 153                         goto err_clk;
 154                 }
 155         }
 156
 157         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 158                                 pdev->resource, pdev->num_resources,
 159                                 &pdata);
 160         if (IS_ERR(data->ci_pdev)) {
 161                 ret = PTR_ERR(data->ci_pdev);
 162                 dev_err(&pdev->dev,
 163                         "Can't register ci_hdrc platform device, err=%d\n",
 164                         ret);
 165                 goto err_clk;
 166         }
 167
 168         if (data->usbmisc_data) {
 169                 ret = imx_usbmisc_init_post(data->usbmisc_data);
 170                 if (ret) {
 171                         dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n",
 172                                         ret);
 173                         goto disable_device;
 174                 }
 175         }
 176
 177         platform_set_drvdata(pdev, data);
 178
 179         pm_runtime_no_callbacks(&pdev->dev);
 180         pm_runtime_enable(&pdev->dev);
 181
 182         return 0;
 183
 184 disable_device:
 185         ci_hdrc_remove_device(data->ci_pdev);
 186 err_clk:
 187         clk_disable_unprepare(data->clk);
 188         return ret;
 189 }
 190
 191 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 192 {
 193         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 194
 195         pm_runtime_disable(&pdev->dev);
 196         ci_hdrc_remove_device(data->ci_pdev);
 197         clk_disable_unprepare(data->clk);
 198
 199         return 0;
 200 }
 201
 202 static struct platform_driver ci_hdrc_imx_driver = {
 203         .probe = ci_hdrc_imx_probe,
 204         .remove = ci_hdrc_imx_remove,
 205         .driver = {
 206                 .name = "imx_usb",
 207                 .owner = THIS_MODULE,
 208                 .of_match_table = ci_hdrc_imx_dt_ids,
 209          },
 210 };
 211
 212 module_platform_driver(ci_hdrc_imx_driver);
 213
 214 MODULE_ALIAS("platform:imx-usb");
 215 MODULE_LICENSE("GPL v2");
 216 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 217 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 218 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");