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