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