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 platform_device *misc_pdev;
  58         struct device_node *np = dev->of_node;
  59         struct of_phandle_args args;
  60         struct imx_usbmisc_data *data;
  61         int ret;
  62
  63         /*
  64          * In case the fsl,usbmisc property is not present this device doesn't
  65          * need usbmisc. Return NULL (which is no error here)
  66          */
  67         if (!of_get_property(np, "fsl,usbmisc", NULL))
  68                 return NULL;
  69
  70         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  71         if (!data)
  72                 return ERR_PTR(-ENOMEM);
  73
  74         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  75                                         0, &args);
  76         if (ret) {
  77                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  78                         ret);
  79                 return ERR_PTR(ret);
  80         }
  81
  82         data->index = args.args[0];
  83
  84         misc_pdev = of_find_device_by_node(args.np);
  85         of_node_put(args.np);
  86
  87         if (!misc_pdev)
  88                 return ERR_PTR(-EPROBE_DEFER);
  89
  90         data->dev = &misc_pdev->dev;
  91
  92         if (of_find_property(np, "disable-over-current", NULL))
  93                 data->disable_oc = 1;
  94
  95         if (of_find_property(np, "external-vbus-divider", NULL))
  96                 data->evdo = 1;
  97
  98         return data;
  99 }
 100
 101 /* End of common functions shared by usbmisc drivers*/
 102
 103 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 104 {
 105         struct ci_hdrc_imx_data *data;
 106         struct ci_hdrc_platform_data pdata = {
 107                 .name           = dev_name(&pdev->dev),
 108                 .capoffset      = DEF_CAPOFFSET,
 109                 .flags          = CI_HDRC_DISABLE_STREAMING,
 110         };
 111         int ret;
 112         const struct of_device_id *of_id =
 113                         of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 114         const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data;
 115
 116         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 117         if (!data)
 118                 return -ENOMEM;
 119
 120         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 121         if (IS_ERR(data->usbmisc_data))
 122                 return PTR_ERR(data->usbmisc_data);
 123
 124         data->clk = devm_clk_get(&pdev->dev, NULL);
 125         if (IS_ERR(data->clk)) {
 126                 dev_err(&pdev->dev,
 127                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 128                 return PTR_ERR(data->clk);
 129         }
 130
 131         ret = clk_prepare_enable(data->clk);
 132         if (ret) {
 133                 dev_err(&pdev->dev,
 134                         "Failed to prepare or enable clock, err=%d\n", ret);
 135                 return ret;
 136         }
 137
 138         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 139         if (IS_ERR(data->phy)) {
 140                 ret = PTR_ERR(data->phy);
 141                 /* Return -EINVAL if no usbphy is available */
 142                 if (ret == -ENODEV)
 143                         ret = -EINVAL;
 144                 goto err_clk;
 145         }
 146
 147         pdata.usb_phy = data->phy;
 148
 149         if (imx_platform_flag->flags & CI_HDRC_IMX_IMX28_WRITE_FIX)
 150                 pdata.flags |= CI_HDRC_IMX28_WRITE_FIX;
 151
 152         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 153         if (ret)
 154                 goto err_clk;
 155
 156         if (data->usbmisc_data) {
 157                 ret = imx_usbmisc_init(data->usbmisc_data);
 158                 if (ret) {
 159                         dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n",
 160                                         ret);
 161                         goto err_clk;
 162                 }
 163         }
 164
 165         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 166                                 pdev->resource, pdev->num_resources,
 167                                 &pdata);
 168         if (IS_ERR(data->ci_pdev)) {
 169                 ret = PTR_ERR(data->ci_pdev);
 170                 dev_err(&pdev->dev,
 171                         "Can't register ci_hdrc platform device, err=%d\n",
 172                         ret);
 173                 goto err_clk;
 174         }
 175
 176         if (data->usbmisc_data) {
 177                 ret = imx_usbmisc_init_post(data->usbmisc_data);
 178                 if (ret) {
 179                         dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n",
 180                                         ret);
 181                         goto disable_device;
 182                 }
 183         }
 184
 185         platform_set_drvdata(pdev, data);
 186
 187         pm_runtime_no_callbacks(&pdev->dev);
 188         pm_runtime_enable(&pdev->dev);
 189
 190         return 0;
 191
 192 disable_device:
 193         ci_hdrc_remove_device(data->ci_pdev);
 194 err_clk:
 195         clk_disable_unprepare(data->clk);
 196         return ret;
 197 }
 198
 199 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 200 {
 201         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 202
 203         pm_runtime_disable(&pdev->dev);
 204         ci_hdrc_remove_device(data->ci_pdev);
 205         clk_disable_unprepare(data->clk);
 206
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_PM_SLEEP
 211 static int imx_controller_suspend(struct device *dev)
 212 {
 213         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 214
 215         dev_dbg(dev, "at %s\n", __func__);
 216
 217         clk_disable_unprepare(data->clk);
 218
 219         return 0;
 220 }
 221
 222 static int imx_controller_resume(struct device *dev)
 223 {
 224         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 225
 226         dev_dbg(dev, "at %s\n", __func__);
 227
 228         return clk_prepare_enable(data->clk);
 229 }
 230
 231 static int ci_hdrc_imx_suspend(struct device *dev)
 232 {
 233         return imx_controller_suspend(dev);
 234 }
 235
 236 static int ci_hdrc_imx_resume(struct device *dev)
 237 {
 238         return imx_controller_resume(dev);
 239 }
 240 #endif /* CONFIG_PM_SLEEP */
 241
 242 static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
 243         SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
 244 };
 245 static struct platform_driver ci_hdrc_imx_driver = {
 246         .probe = ci_hdrc_imx_probe,
 247         .remove = ci_hdrc_imx_remove,
 248         .driver = {
 249                 .name = "imx_usb",
 250                 .of_match_table = ci_hdrc_imx_dt_ids,
 251                 .pm = &ci_hdrc_imx_pm_ops,
 252          },
 253 };
 254
 255 module_platform_driver(ci_hdrc_imx_driver);
 256
 257 MODULE_ALIAS("platform:imx-usb");
 258 MODULE_LICENSE("GPL v2");
 259 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 260 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 261 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");