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 #include <linux/regulator/consumer.h>
  23
  24 #include "ci.h"
  25 #include "ci_hdrc_imx.h"
  26
  27 #define pdev_to_phy(pdev) \
  28         ((struct usb_phy *)platform_get_drvdata(pdev))
  29
  30 struct ci_hdrc_imx_data {
  31         struct usb_phy *phy;
  32         struct platform_device *ci_pdev;
  33         struct clk *clk;
  34         struct regulator *reg_vbus;
  35 };
  36
  37 static const struct usbmisc_ops *usbmisc_ops;
  38
  39 /* Common functions shared by usbmisc drivers */
  40
  41 int usbmisc_set_ops(const struct usbmisc_ops *ops)
  42 {
  43         if (usbmisc_ops)
  44                 return -EBUSY;
  45
  46         usbmisc_ops = ops;
  47
  48         return 0;
  49 }
  50 EXPORT_SYMBOL_GPL(usbmisc_set_ops);
  51
  52 void usbmisc_unset_ops(const struct usbmisc_ops *ops)
  53 {
  54         usbmisc_ops = NULL;
  55 }
  56 EXPORT_SYMBOL_GPL(usbmisc_unset_ops);
  57
  58 int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
  59 {
  60         struct device_node *np = dev->of_node;
  61         struct of_phandle_args args;
  62         int ret;
  63
  64         usbdev->dev = dev;
  65
  66         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  67                                         0, &args);
  68         if (ret) {
  69                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  70                         ret);
  71                 memset(usbdev, 0, sizeof(*usbdev));
  72                 return ret;
  73         }
  74         usbdev->index = args.args[0];
  75         of_node_put(args.np);
  76
  77         if (of_find_property(np, "disable-over-current", NULL))
  78                 usbdev->disable_oc = 1;
  79
  80         if (of_find_property(np, "external-vbus-divider", NULL))
  81                 usbdev->evdo = 1;
  82
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(usbmisc_get_init_data);
  86
  87 /* End of common functions shared by usbmisc drivers*/
  88
  89 static int ci_hdrc_imx_probe(struct platform_device *pdev)
  90 {
  91         struct ci_hdrc_imx_data *data;
  92         struct ci_hdrc_platform_data pdata = {
  93                 .name           = "ci_hdrc_imx",
  94                 .capoffset      = DEF_CAPOFFSET,
  95                 .flags          = CI_HDRC_REQUIRE_TRANSCEIVER |
  96                                   CI_HDRC_PULLUP_ON_VBUS |
  97                                   CI_HDRC_DISABLE_STREAMING,
  98         };
  99         struct resource *res;
 100         int ret;
 101
 102         if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
 103                 && !usbmisc_ops)
 104                 return -EPROBE_DEFER;
 105
 106         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 107         if (!data) {
 108                 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n");
 109                 return -ENOMEM;
 110         }
 111
 112         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 113         if (!res) {
 114                 dev_err(&pdev->dev, "Can't get device resources!\n");
 115                 return -ENOENT;
 116         }
 117
 118         data->clk = devm_clk_get(&pdev->dev, NULL);
 119         if (IS_ERR(data->clk)) {
 120                 dev_err(&pdev->dev,
 121                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 122                 return PTR_ERR(data->clk);
 123         }
 124
 125         ret = clk_prepare_enable(data->clk);
 126         if (ret) {
 127                 dev_err(&pdev->dev,
 128                         "Failed to prepare or enable clock, err=%d\n", ret);
 129                 return ret;
 130         }
 131
 132         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 133         if (!IS_ERR(data->phy)) {
 134                 ret = usb_phy_init(data->phy);
 135                 if (ret) {
 136                         dev_err(&pdev->dev, "unable to init phy: %d\n", ret);
 137                         goto err_clk;
 138                 }
 139         } else if (PTR_ERR(data->phy) == -EPROBE_DEFER) {
 140                 ret = -EPROBE_DEFER;
 141                 goto err_clk;
 142         }
 143
 144         /* we only support host now, so enable vbus here */
 145         data->reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
 146         if (!IS_ERR(data->reg_vbus)) {
 147                 ret = regulator_enable(data->reg_vbus);
 148                 if (ret) {
 149                         dev_err(&pdev->dev,
 150                                 "Failed to enable vbus regulator, err=%d\n",
 151                                 ret);
 152                         goto err_clk;
 153                 }
 154         } else {
 155                 data->reg_vbus = NULL;
 156         }
 157
 158         pdata.phy = data->phy;
 159
 160         if (!pdev->dev.dma_mask)
 161                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 162         if (!pdev->dev.coherent_dma_mask)
 163                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 164
 165         if (usbmisc_ops && usbmisc_ops->init) {
 166                 ret = usbmisc_ops->init(&pdev->dev);
 167                 if (ret) {
 168                         dev_err(&pdev->dev,
 169                                 "usbmisc init failed, ret=%d\n", ret);
 170                         goto err;
 171                 }
 172         }
 173
 174         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 175                                 pdev->resource, pdev->num_resources,
 176                                 &pdata);
 177         if (IS_ERR(data->ci_pdev)) {
 178                 ret = PTR_ERR(data->ci_pdev);
 179                 dev_err(&pdev->dev,
 180                         "Can't register ci_hdrc platform device, err=%d\n",
 181                         ret);
 182                 goto err;
 183         }
 184
 185         if (usbmisc_ops && usbmisc_ops->post) {
 186                 ret = usbmisc_ops->post(&pdev->dev);
 187                 if (ret) {
 188                         dev_err(&pdev->dev,
 189                                 "usbmisc post failed, ret=%d\n", ret);
 190                         goto disable_device;
 191                 }
 192         }
 193
 194         platform_set_drvdata(pdev, data);
 195
 196         pm_runtime_no_callbacks(&pdev->dev);
 197         pm_runtime_enable(&pdev->dev);
 198
 199         return 0;
 200
 201 disable_device:
 202         ci_hdrc_remove_device(data->ci_pdev);
 203 err:
 204         if (data->reg_vbus)
 205                 regulator_disable(data->reg_vbus);
 206 err_clk:
 207         clk_disable_unprepare(data->clk);
 208         return ret;
 209 }
 210
 211 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 212 {
 213         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 214
 215         pm_runtime_disable(&pdev->dev);
 216         ci_hdrc_remove_device(data->ci_pdev);
 217
 218         if (data->reg_vbus)
 219                 regulator_disable(data->reg_vbus);
 220
 221         if (data->phy) {
 222                 usb_phy_shutdown(data->phy);
 223                 module_put(data->phy->dev->driver->owner);
 224         }
 225
 226         clk_disable_unprepare(data->clk);
 227
 228         return 0;
 229 }
 230
 231 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 232         { .compatible = "fsl,imx27-usb", },
 233         { /* sentinel */ }
 234 };
 235 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
 236
 237 static struct platform_driver ci_hdrc_imx_driver = {
 238         .probe = ci_hdrc_imx_probe,
 239         .remove = ci_hdrc_imx_remove,
 240         .driver = {
 241                 .name = "imx_usb",
 242                 .owner = THIS_MODULE,
 243                 .of_match_table = ci_hdrc_imx_dt_ids,
 244          },
 245 };
 246
 247 module_platform_driver(ci_hdrc_imx_driver);
 248
 249 MODULE_ALIAS("platform:imx-usb");
 250 MODULE_LICENSE("GPL v2");
 251 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 252 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 253 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");