drivers/usb/chipidea/ci_hdrc_imx.c

   1 /*
   2  * Copyright 2012-2015 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_platform_flag {
  27         unsigned int flags;
  28 };
  29
  30 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
  31 };
  32
  33 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
  34         .flags = CI_HDRC_IMX28_WRITE_FIX,
  35 };
  36
  37 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
  38         { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
  39         { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
  40         { /* sentinel */ }
  41 };
  42 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
  43
  44 struct ci_hdrc_imx_data {
  45         struct usb_phy *phy;
  46         struct platform_device *ci_pdev;
  47         struct clk *clk;
  48         struct imx_usbmisc_data *usbmisc_data;
  49 };
  50
  51 /* Common functions shared by usbmisc drivers */
  52
  53 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
  54 {
  55         struct platform_device *misc_pdev;
  56         struct device_node *np = dev->of_node;
  57         struct of_phandle_args args;
  58         struct imx_usbmisc_data *data;
  59         int ret;
  60
  61         /*
  62          * In case the fsl,usbmisc property is not present this device doesn't
  63          * need usbmisc. Return NULL (which is no error here)
  64          */
  65         if (!of_get_property(np, "fsl,usbmisc", NULL))
  66                 return NULL;
  67
  68         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  69         if (!data)
  70                 return ERR_PTR(-ENOMEM);
  71
  72         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  73                                         0, &args);
  74         if (ret) {
  75                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  76                         ret);
  77                 return ERR_PTR(ret);
  78         }
  79
  80         data->index = args.args[0];
  81
  82         misc_pdev = of_find_device_by_node(args.np);
  83         of_node_put(args.np);
  84
  85         if (!misc_pdev)
  86                 return ERR_PTR(-EPROBE_DEFER);
  87
  88         data->dev = &misc_pdev->dev;
  89
  90         if (of_find_property(np, "disable-over-current", NULL))
  91                 data->disable_oc = 1;
  92
  93         if (of_find_property(np, "external-vbus-divider", NULL))
  94                 data->evdo = 1;
  95
  96         return data;
  97 }
  98
  99 /* End of common functions shared by usbmisc drivers*/
 100
 101 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 102 {
 103         struct ci_hdrc_imx_data *data;
 104         struct ci_hdrc_platform_data pdata = {
 105                 .name           = dev_name(&pdev->dev),
 106                 .capoffset      = DEF_CAPOFFSET,
 107                 .flags          = CI_HDRC_DISABLE_STREAMING,
 108         };
 109         int ret;
 110         const struct of_device_id *of_id =
 111                         of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 112         const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data;
 113
 114         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 115         if (!data)
 116                 return -ENOMEM;
 117
 118         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 119         if (IS_ERR(data->usbmisc_data))
 120                 return PTR_ERR(data->usbmisc_data);
 121
 122         data->clk = devm_clk_get(&pdev->dev, NULL);
 123         if (IS_ERR(data->clk)) {
 124                 dev_err(&pdev->dev,
 125                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 126                 return PTR_ERR(data->clk);
 127         }
 128
 129         ret = clk_prepare_enable(data->clk);
 130         if (ret) {
 131                 dev_err(&pdev->dev,
 132                         "Failed to prepare or enable clock, err=%d\n", ret);
 133                 return ret;
 134         }
 135
 136         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 137         if (IS_ERR(data->phy)) {
 138                 ret = PTR_ERR(data->phy);
 139                 /* Return -EINVAL if no usbphy is available */
 140                 if (ret == -ENODEV)
 141                         ret = -EINVAL;
 142                 goto err_clk;
 143         }
 144
 145         pdata.usb_phy = data->phy;
 146         pdata.flags |= imx_platform_flag->flags;
 147
 148         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 149         if (ret)
 150                 goto err_clk;
 151
 152         ret = imx_usbmisc_init(data->usbmisc_data);
 153         if (ret) {
 154                 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", ret);
 155                 goto err_clk;
 156         }
 157
 158         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 159                                 pdev->resource, pdev->num_resources,
 160                                 &pdata);
 161         if (IS_ERR(data->ci_pdev)) {
 162                 ret = PTR_ERR(data->ci_pdev);
 163                 dev_err(&pdev->dev,
 164                         "Can't register ci_hdrc platform device, err=%d\n",
 165                         ret);
 166                 goto err_clk;
 167         }
 168
 169         ret = imx_usbmisc_init_post(data->usbmisc_data);
 170         if (ret) {
 171                 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", ret);
 172                 goto disable_device;
 173         }
 174
 175         platform_set_drvdata(pdev, data);
 176
 177         pm_runtime_no_callbacks(&pdev->dev);
 178         pm_runtime_enable(&pdev->dev);
 179
 180         return 0;
 181
 182 disable_device:
 183         ci_hdrc_remove_device(data->ci_pdev);
 184 err_clk:
 185         clk_disable_unprepare(data->clk);
 186         return ret;
 187 }
 188
 189 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 190 {
 191         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 192
 193         pm_runtime_disable(&pdev->dev);
 194         ci_hdrc_remove_device(data->ci_pdev);
 195         clk_disable_unprepare(data->clk);
 196
 197         return 0;
 198 }
 199
 200 #ifdef CONFIG_PM_SLEEP
 201 static int imx_controller_suspend(struct device *dev)
 202 {
 203         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 204
 205         dev_dbg(dev, "at %s\n", __func__);
 206
 207         clk_disable_unprepare(data->clk);
 208
 209         return 0;
 210 }
 211
 212 static int imx_controller_resume(struct device *dev)
 213 {
 214         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 215
 216         dev_dbg(dev, "at %s\n", __func__);
 217
 218         return clk_prepare_enable(data->clk);
 219 }
 220
 221 static int ci_hdrc_imx_suspend(struct device *dev)
 222 {
 223         return imx_controller_suspend(dev);
 224 }
 225
 226 static int ci_hdrc_imx_resume(struct device *dev)
 227 {
 228         return imx_controller_resume(dev);
 229 }
 230 #endif /* CONFIG_PM_SLEEP */
 231
 232 static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
 233         SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
 234 };
 235 static struct platform_driver ci_hdrc_imx_driver = {
 236         .probe = ci_hdrc_imx_probe,
 237         .remove = ci_hdrc_imx_remove,
 238         .driver = {
 239                 .name = "imx_usb",
 240                 .owner = THIS_MODULE,
 241                 .of_match_table = ci_hdrc_imx_dt_ids,
 242                 .pm = &ci_hdrc_imx_pm_ops,
 243          },
 244 };
 245
 246 module_platform_driver(ci_hdrc_imx_driver);
 247
 248 MODULE_ALIAS("platform:imx-usb");
 249 MODULE_LICENSE("GPL v2");
 250 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 251 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 252 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");