drivers/usb/chipidea/ci13xxx_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 "ci13xxx_imx.h"
  26
  27 #define pdev_to_phy(pdev) \
  28         ((struct usb_phy *)platform_get_drvdata(pdev))
  29
  30 struct ci13xxx_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 ci13xxx_imx_probe(struct platform_device *pdev)
  90 {
  91         struct ci13xxx_imx_data *data;
  92         struct ci13xxx_platform_data pdata = {
  93                 .name           = "ci13xxx_imx",
  94                 .capoffset      = DEF_CAPOFFSET,
  95                 .flags          = CI13XXX_REQUIRE_TRANSCEIVER |
  96                                   CI13XXX_PULLUP_ON_VBUS |
  97                                   CI13XXX_DISABLE_STREAMING,
  98         };
  99         struct resource *res;
 100         int ret;
 101         struct usb_phy *phy;
 102
 103         if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
 104                 && !usbmisc_ops)
 105                 return -EPROBE_DEFER;
 106
 107         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 108         if (!data) {
 109                 dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
 110                 return -ENOMEM;
 111         }
 112
 113         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 114         if (!res) {
 115                 dev_err(&pdev->dev, "Can't get device resources!\n");
 116                 return -ENOENT;
 117         }
 118
 119         data->clk = devm_clk_get(&pdev->dev, NULL);
 120         if (IS_ERR(data->clk)) {
 121                 dev_err(&pdev->dev,
 122                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 123                 return PTR_ERR(data->clk);
 124         }
 125
 126         ret = clk_prepare_enable(data->clk);
 127         if (ret) {
 128                 dev_err(&pdev->dev,
 129                         "Failed to prepare or enable clock, err=%d\n", ret);
 130                 return ret;
 131         }
 132
 133         phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 134         if (!IS_ERR(phy)) {
 135                 ret = usb_phy_init(phy);
 136                 if (ret) {
 137                         dev_err(&pdev->dev, "unable to init phy: %d\n", ret);
 138                         goto err_clk;
 139                 }
 140         } else if (PTR_ERR(phy) == -EPROBE_DEFER) {
 141                 ret = -EPROBE_DEFER;
 142                 goto err_clk;
 143         }
 144
 145         /* we only support host now, so enable vbus here */
 146         data->reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
 147         if (!IS_ERR(data->reg_vbus)) {
 148                 ret = regulator_enable(data->reg_vbus);
 149                 if (ret) {
 150                         dev_err(&pdev->dev,
 151                                 "Failed to enable vbus regulator, err=%d\n",
 152                                 ret);
 153                         goto err_clk;
 154                 }
 155         } else {
 156                 data->reg_vbus = NULL;
 157         }
 158
 159         pdata.phy = data->phy;
 160
 161         if (!pdev->dev.dma_mask)
 162                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 163         if (!pdev->dev.coherent_dma_mask)
 164                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 165
 166         if (usbmisc_ops && usbmisc_ops->init) {
 167                 ret = usbmisc_ops->init(&pdev->dev);
 168                 if (ret) {
 169                         dev_err(&pdev->dev,
 170                                 "usbmisc init failed, ret=%d\n", ret);
 171                         goto err;
 172                 }
 173         }
 174
 175         data->ci_pdev = ci13xxx_add_device(&pdev->dev,
 176                                 pdev->resource, pdev->num_resources,
 177                                 &pdata);
 178         if (IS_ERR(data->ci_pdev)) {
 179                 ret = PTR_ERR(data->ci_pdev);
 180                 dev_err(&pdev->dev,
 181                         "Can't register ci_hdrc platform device, err=%d\n",
 182                         ret);
 183                 goto err;
 184         }
 185
 186         if (usbmisc_ops && usbmisc_ops->post) {
 187                 ret = usbmisc_ops->post(&pdev->dev);
 188                 if (ret) {
 189                         dev_err(&pdev->dev,
 190                                 "usbmisc post failed, ret=%d\n", ret);
 191                         goto disable_device;
 192                 }
 193         }
 194
 195         platform_set_drvdata(pdev, data);
 196
 197         pm_runtime_no_callbacks(&pdev->dev);
 198         pm_runtime_enable(&pdev->dev);
 199
 200         return 0;
 201
 202 disable_device:
 203         ci13xxx_remove_device(data->ci_pdev);
 204 err:
 205         if (data->reg_vbus)
 206                 regulator_disable(data->reg_vbus);
 207 err_clk:
 208         clk_disable_unprepare(data->clk);
 209         return ret;
 210 }
 211
 212 static int ci13xxx_imx_remove(struct platform_device *pdev)
 213 {
 214         struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);
 215
 216         pm_runtime_disable(&pdev->dev);
 217         ci13xxx_remove_device(data->ci_pdev);
 218
 219         if (data->reg_vbus)
 220                 regulator_disable(data->reg_vbus);
 221
 222         if (data->phy) {
 223                 usb_phy_shutdown(data->phy);
 224                 module_put(data->phy->dev->driver->owner);
 225         }
 226
 227         clk_disable_unprepare(data->clk);
 228
 229         return 0;
 230 }
 231
 232 static const struct of_device_id ci13xxx_imx_dt_ids[] = {
 233         { .compatible = "fsl,imx27-usb", },
 234         { /* sentinel */ }
 235 };
 236 MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);
 237
 238 static struct platform_driver ci13xxx_imx_driver = {
 239         .probe = ci13xxx_imx_probe,
 240         .remove = ci13xxx_imx_remove,
 241         .driver = {
 242                 .name = "imx_usb",
 243                 .owner = THIS_MODULE,
 244                 .of_match_table = ci13xxx_imx_dt_ids,
 245          },
 246 };
 247
 248 module_platform_driver(ci13xxx_imx_driver);
 249
 250 MODULE_ALIAS("platform:imx-usb");
 251 MODULE_LICENSE("GPL v2");
 252 MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
 253 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 254 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");