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 #include <linux/pinctrl/consumer.h>
  24
  25 #include "ci.h"
  26 #include "ci13xxx_imx.h"
  27
  28 #define pdev_to_phy(pdev) \
  29         ((struct usb_phy *)platform_get_drvdata(pdev))
  30
  31 struct ci13xxx_imx_data {
  32         struct device_node *phy_np;
  33         struct usb_phy *phy;
  34         struct platform_device *ci_pdev;
  35         struct clk *clk;
  36         struct regulator *reg_vbus;
  37 };
  38
  39 static const struct usbmisc_ops *usbmisc_ops;
  40
  41 /* Common functions shared by usbmisc drivers */
  42
  43 int usbmisc_set_ops(const struct usbmisc_ops *ops)
  44 {
  45         if (usbmisc_ops)
  46                 return -EBUSY;
  47
  48         usbmisc_ops = ops;
  49
  50         return 0;
  51 }
  52 EXPORT_SYMBOL_GPL(usbmisc_set_ops);
  53
  54 void usbmisc_unset_ops(const struct usbmisc_ops *ops)
  55 {
  56         usbmisc_ops = NULL;
  57 }
  58 EXPORT_SYMBOL_GPL(usbmisc_unset_ops);
  59
  60 int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
  61 {
  62         struct device_node *np = dev->of_node;
  63         struct of_phandle_args args;
  64         int ret;
  65
  66         usbdev->dev = dev;
  67
  68         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
  69                                         0, &args);
  70         if (ret) {
  71                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
  72                         ret);
  73                 memset(usbdev, 0, sizeof(*usbdev));
  74                 return ret;
  75         }
  76         usbdev->index = args.args[0];
  77         of_node_put(args.np);
  78
  79         if (of_find_property(np, "disable-over-current", NULL))
  80                 usbdev->disable_oc = 1;
  81
  82         return 0;
  83 }
  84 EXPORT_SYMBOL_GPL(usbmisc_get_init_data);
  85
  86 /* End of common functions shared by usbmisc drivers*/
  87
  88 static struct ci13xxx_platform_data ci13xxx_imx_platdata  = {
  89         .name                   = "ci13xxx_imx",
  90         .flags                  = CI13XXX_REQUIRE_TRANSCEIVER |
  91                                   CI13XXX_PULLUP_ON_VBUS |
  92                                   CI13XXX_DISABLE_STREAMING,
  93         .capoffset              = DEF_CAPOFFSET,
  94 };
  95
  96 static int ci13xxx_imx_probe(struct platform_device *pdev)
  97 {
  98         struct ci13xxx_imx_data *data;
  99         struct platform_device *plat_ci, *phy_pdev;
 100         struct device_node *phy_np;
 101         struct resource *res;
 102         struct regulator *reg_vbus;
 103         struct pinctrl *pinctrl;
 104         int ret;
 105
 106         if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
 107                 && !usbmisc_ops)
 108                 return -EPROBE_DEFER;
 109
 110         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 111         if (!data) {
 112                 dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
 113                 return -ENOMEM;
 114         }
 115
 116         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 117         if (!res) {
 118                 dev_err(&pdev->dev, "Can't get device resources!\n");
 119                 return -ENOENT;
 120         }
 121
 122         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 123         if (IS_ERR(pinctrl))
 124                 dev_warn(&pdev->dev, "pinctrl get/select failed, err=%ld\n",
 125                         PTR_ERR(pinctrl));
 126
 127         data->clk = devm_clk_get(&pdev->dev, NULL);
 128         if (IS_ERR(data->clk)) {
 129                 dev_err(&pdev->dev,
 130                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 131                 return PTR_ERR(data->clk);
 132         }
 133
 134         ret = clk_prepare_enable(data->clk);
 135         if (ret) {
 136                 dev_err(&pdev->dev,
 137                         "Failed to prepare or enable clock, err=%d\n", ret);
 138                 return ret;
 139         }
 140
 141         phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
 142         if (phy_np) {
 143                 data->phy_np = phy_np;
 144                 phy_pdev = of_find_device_by_node(phy_np);
 145                 if (phy_pdev) {
 146                         struct usb_phy *phy;
 147                         phy = pdev_to_phy(phy_pdev);
 148                         if (phy &&
 149                             try_module_get(phy_pdev->dev.driver->owner)) {
 150                                 usb_phy_init(phy);
 151                                 data->phy = phy;
 152                         }
 153                 }
 154         }
 155
 156         /* we only support host now, so enable vbus here */
 157         reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
 158         if (!IS_ERR(reg_vbus)) {
 159                 ret = regulator_enable(reg_vbus);
 160                 if (ret) {
 161                         dev_err(&pdev->dev,
 162                                 "Failed to enable vbus regulator, err=%d\n",
 163                                 ret);
 164                         goto put_np;
 165                 }
 166                 data->reg_vbus = reg_vbus;
 167         } else {
 168                 reg_vbus = NULL;
 169         }
 170
 171         ci13xxx_imx_platdata.phy = data->phy;
 172
 173         if (!pdev->dev.dma_mask) {
 174                 pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
 175                                       sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
 176                 if (!pdev->dev.dma_mask) {
 177                         ret = -ENOMEM;
 178                         dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
 179                         goto err;
 180                 }
 181                 *pdev->dev.dma_mask = DMA_BIT_MASK(32);
 182                 dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
 183         }
 184
 185         if (usbmisc_ops && usbmisc_ops->init) {
 186                 ret = usbmisc_ops->init(&pdev->dev);
 187                 if (ret) {
 188                         dev_err(&pdev->dev,
 189                                 "usbmisc init failed, ret=%d\n", ret);
 190                         goto err;
 191                 }
 192         }
 193
 194         plat_ci = ci13xxx_add_device(&pdev->dev,
 195                                 pdev->resource, pdev->num_resources,
 196                                 &ci13xxx_imx_platdata);
 197         if (IS_ERR(plat_ci)) {
 198                 ret = PTR_ERR(plat_ci);
 199                 dev_err(&pdev->dev,
 200                         "Can't register ci_hdrc platform device, err=%d\n",
 201                         ret);
 202                 goto err;
 203         }
 204
 205         data->ci_pdev = plat_ci;
 206         platform_set_drvdata(pdev, data);
 207
 208         pm_runtime_no_callbacks(&pdev->dev);
 209         pm_runtime_enable(&pdev->dev);
 210
 211         return 0;
 212
 213 err:
 214         if (reg_vbus)
 215                 regulator_disable(reg_vbus);
 216 put_np:
 217         if (phy_np)
 218                 of_node_put(phy_np);
 219         clk_disable_unprepare(data->clk);
 220         return ret;
 221 }
 222
 223 static int ci13xxx_imx_remove(struct platform_device *pdev)
 224 {
 225         struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);
 226
 227         pm_runtime_disable(&pdev->dev);
 228         ci13xxx_remove_device(data->ci_pdev);
 229
 230         if (data->reg_vbus)
 231                 regulator_disable(data->reg_vbus);
 232
 233         if (data->phy) {
 234                 usb_phy_shutdown(data->phy);
 235                 module_put(data->phy->dev->driver->owner);
 236         }
 237
 238         of_node_put(data->phy_np);
 239
 240         clk_disable_unprepare(data->clk);
 241
 242         platform_set_drvdata(pdev, NULL);
 243
 244         return 0;
 245 }
 246
 247 static const struct of_device_id ci13xxx_imx_dt_ids[] = {
 248         { .compatible = "fsl,imx27-usb", },
 249         { /* sentinel */ }
 250 };
 251 MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);
 252
 253 static struct platform_driver ci13xxx_imx_driver = {
 254         .probe = ci13xxx_imx_probe,
 255         .remove = ci13xxx_imx_remove,
 256         .driver = {
 257                 .name = "imx_usb",
 258                 .owner = THIS_MODULE,
 259                 .of_match_table = ci13xxx_imx_dt_ids,
 260          },
 261 };
 262
 263 module_platform_driver(ci13xxx_imx_driver);
 264
 265 MODULE_ALIAS("platform:imx-usb");
 266 MODULE_LICENSE("GPL v2");
 267 MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
 268 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 269 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");