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 struct ci_hdrc_imx_data {
  27         struct usb_phy *phy;
  28         struct platform_device *ci_pdev;
  29         struct clk *clk;
  30         struct imx_usbmisc_data *usbmisc_data;
  31 };
  32
  33 /* Common functions shared by usbmisc drivers */
  34
  35 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
  36 {
  37         struct device_node *np = dev->of_node;
  38         struct of_phandle_args args;
  39         struct imx_usbmisc_data *data;
  40         int ret;
  41
  42         /*
  43          * In case the fsl,usbmisc property is not present this device doesn't
  44          * need usbmisc. Return NULL (which is no error here)
  45          */
  46         if (!of_get_property(np, "fsl,usbmisc", NULL))
  47                 return NULL;
  48
  49         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  50         if (!data)
  51                 return ERR_PTR(-ENOMEM);
  52
  53         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  54                                         0, &args);
  55         if (ret) {
  56                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  57                         ret);
  58                 return ERR_PTR(ret);
  59         }
  60
  61         data->index = args.args[0];
  62         of_node_put(args.np);
  63
  64         if (of_find_property(np, "disable-over-current", NULL))
  65                 data->disable_oc = 1;
  66
  67         if (of_find_property(np, "external-vbus-divider", NULL))
  68                 data->evdo = 1;
  69
  70         return data;
  71 }
  72
  73 /* End of common functions shared by usbmisc drivers*/
  74
  75 static int ci_hdrc_imx_probe(struct platform_device *pdev)
  76 {
  77         struct ci_hdrc_imx_data *data;
  78         struct ci_hdrc_platform_data pdata = {
  79                 .name           = "ci_hdrc_imx",
  80                 .capoffset      = DEF_CAPOFFSET,
  81                 .flags          = CI_HDRC_REQUIRE_TRANSCEIVER |
  82                                   CI_HDRC_DISABLE_STREAMING,
  83         };
  84         int ret;
  85
  86         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  87         if (!data) {
  88                 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n");
  89                 return -ENOMEM;
  90         }
  91
  92         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
  93         if (IS_ERR(data->usbmisc_data))
  94                 return PTR_ERR(data->usbmisc_data);
  95
  96         data->clk = devm_clk_get(&pdev->dev, NULL);
  97         if (IS_ERR(data->clk)) {
  98                 dev_err(&pdev->dev,
  99                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 100                 return PTR_ERR(data->clk);
 101         }
 102
 103         ret = clk_prepare_enable(data->clk);
 104         if (ret) {
 105                 dev_err(&pdev->dev,
 106                         "Failed to prepare or enable clock, err=%d\n", ret);
 107                 return ret;
 108         }
 109
 110         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 111         if (!IS_ERR(data->phy)) {
 112                 ret = usb_phy_init(data->phy);
 113                 if (ret) {
 114                         dev_err(&pdev->dev, "unable to init phy: %d\n", ret);
 115                         goto err_clk;
 116                 }
 117         } else if (PTR_ERR(data->phy) == -EPROBE_DEFER) {
 118                 ret = -EPROBE_DEFER;
 119                 goto err_clk;
 120         }
 121
 122         pdata.phy = data->phy;
 123
 124         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 125         if (ret)
 126                 goto err_clk;
 127
 128         if (data->usbmisc_data) {
 129                 ret = imx_usbmisc_init(data->usbmisc_data);
 130                 if (ret) {
 131                         dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n",
 132                                         ret);
 133                         goto err_phy;
 134                 }
 135         }
 136
 137         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 138                                 pdev->resource, pdev->num_resources,
 139                                 &pdata);
 140         if (IS_ERR(data->ci_pdev)) {
 141                 ret = PTR_ERR(data->ci_pdev);
 142                 dev_err(&pdev->dev,
 143                         "Can't register ci_hdrc platform device, err=%d\n",
 144                         ret);
 145                 goto err_phy;
 146         }
 147
 148         if (data->usbmisc_data) {
 149                 ret = imx_usbmisc_init_post(data->usbmisc_data);
 150                 if (ret) {
 151                         dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n",
 152                                         ret);
 153                         goto disable_device;
 154                 }
 155         }
 156
 157         platform_set_drvdata(pdev, data);
 158
 159         pm_runtime_no_callbacks(&pdev->dev);
 160         pm_runtime_enable(&pdev->dev);
 161
 162         return 0;
 163
 164 disable_device:
 165         ci_hdrc_remove_device(data->ci_pdev);
 166 err_phy:
 167         if (data->phy)
 168                 usb_phy_shutdown(data->phy);
 169 err_clk:
 170         clk_disable_unprepare(data->clk);
 171         return ret;
 172 }
 173
 174 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 175 {
 176         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 177
 178         pm_runtime_disable(&pdev->dev);
 179         ci_hdrc_remove_device(data->ci_pdev);
 180
 181         if (data->phy)
 182                 usb_phy_shutdown(data->phy);
 183
 184         clk_disable_unprepare(data->clk);
 185
 186         return 0;
 187 }
 188
 189 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 190         { .compatible = "fsl,imx27-usb", },
 191         { /* sentinel */ }
 192 };
 193 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
 194
 195 static struct platform_driver ci_hdrc_imx_driver = {
 196         .probe = ci_hdrc_imx_probe,
 197         .remove = ci_hdrc_imx_remove,
 198         .driver = {
 199                 .name = "imx_usb",
 200                 .owner = THIS_MODULE,
 201                 .of_match_table = ci_hdrc_imx_dt_ids,
 202          },
 203 };
 204
 205 module_platform_driver(ci_hdrc_imx_driver);
 206
 207 MODULE_ALIAS("platform:imx-usb");
 208 MODULE_LICENSE("GPL v2");
 209 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 210 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 211 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");