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         if (of_find_property(np, "external-vbus-divider", NULL))
  83                 usbdev->evdo = 1;
  84
  85         return 0;
  86 }
  87 EXPORT_SYMBOL_GPL(usbmisc_get_init_data);
  88
  89 /* End of common functions shared by usbmisc drivers*/
  90
  91 static struct ci13xxx_platform_data ci13xxx_imx_platdata  = {
  92         .name                   = "ci13xxx_imx",
  93         .flags                  = CI13XXX_REQUIRE_TRANSCEIVER |
  94                                   CI13XXX_PULLUP_ON_VBUS |
  95                                   CI13XXX_DISABLE_STREAMING,
  96         .capoffset              = DEF_CAPOFFSET,
  97 };
  98
  99 static int ci13xxx_imx_probe(struct platform_device *pdev)
 100 {
 101         struct ci13xxx_imx_data *data;
 102         struct platform_device *plat_ci, *phy_pdev;
 103         struct device_node *phy_np;
 104         struct resource *res;
 105         struct regulator *reg_vbus;
 106         struct pinctrl *pinctrl;
 107         int ret;
 108
 109         if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
 110                 && !usbmisc_ops)
 111                 return -EPROBE_DEFER;
 112
 113         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 114         if (!data) {
 115                 dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
 116                 return -ENOMEM;
 117         }
 118
 119         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 120         if (!res) {
 121                 dev_err(&pdev->dev, "Can't get device resources!\n");
 122                 return -ENOENT;
 123         }
 124
 125         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 126         if (IS_ERR(pinctrl))
 127                 dev_warn(&pdev->dev, "pinctrl get/select failed, err=%ld\n",
 128                         PTR_ERR(pinctrl));
 129
 130         data->clk = devm_clk_get(&pdev->dev, NULL);
 131         if (IS_ERR(data->clk)) {
 132                 dev_err(&pdev->dev,
 133                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 134                 return PTR_ERR(data->clk);
 135         }
 136
 137         ret = clk_prepare_enable(data->clk);
 138         if (ret) {
 139                 dev_err(&pdev->dev,
 140                         "Failed to prepare or enable clock, err=%d\n", ret);
 141                 return ret;
 142         }
 143
 144         phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
 145         if (phy_np) {
 146                 data->phy_np = phy_np;
 147                 phy_pdev = of_find_device_by_node(phy_np);
 148                 if (phy_pdev) {
 149                         struct usb_phy *phy;
 150                         phy = pdev_to_phy(phy_pdev);
 151                         if (phy &&
 152                             try_module_get(phy_pdev->dev.driver->owner)) {
 153                                 usb_phy_init(phy);
 154                                 data->phy = phy;
 155                         }
 156                 }
 157         }
 158
 159         /* we only support host now, so enable vbus here */
 160         reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
 161         if (!IS_ERR(reg_vbus)) {
 162                 ret = regulator_enable(reg_vbus);
 163                 if (ret) {
 164                         dev_err(&pdev->dev,
 165                                 "Failed to enable vbus regulator, err=%d\n",
 166                                 ret);
 167                         goto put_np;
 168                 }
 169                 data->reg_vbus = reg_vbus;
 170         } else {
 171                 reg_vbus = NULL;
 172         }
 173
 174         ci13xxx_imx_platdata.phy = data->phy;
 175
 176         if (!pdev->dev.dma_mask) {
 177                 pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
 178                                       sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
 179                 if (!pdev->dev.dma_mask) {
 180                         ret = -ENOMEM;
 181                         dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
 182                         goto err;
 183                 }
 184                 *pdev->dev.dma_mask = DMA_BIT_MASK(32);
 185                 dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
 186         }
 187
 188         if (usbmisc_ops && usbmisc_ops->init) {
 189                 ret = usbmisc_ops->init(&pdev->dev);
 190                 if (ret) {
 191                         dev_err(&pdev->dev,
 192                                 "usbmisc init failed, ret=%d\n", ret);
 193                         goto err;
 194                 }
 195         }
 196
 197         plat_ci = ci13xxx_add_device(&pdev->dev,
 198                                 pdev->resource, pdev->num_resources,
 199                                 &ci13xxx_imx_platdata);
 200         if (IS_ERR(plat_ci)) {
 201                 ret = PTR_ERR(plat_ci);
 202                 dev_err(&pdev->dev,
 203                         "Can't register ci_hdrc platform device, err=%d\n",
 204                         ret);
 205                 goto err;
 206         }
 207
 208         if (usbmisc_ops && usbmisc_ops->post) {
 209                 ret = usbmisc_ops->post(&pdev->dev);
 210                 if (ret) {
 211                         dev_err(&pdev->dev,
 212                                 "usbmisc post failed, ret=%d\n", ret);
 213                         goto put_np;
 214                 }
 215         }
 216
 217         data->ci_pdev = plat_ci;
 218         platform_set_drvdata(pdev, data);
 219
 220         pm_runtime_no_callbacks(&pdev->dev);
 221         pm_runtime_enable(&pdev->dev);
 222
 223         return 0;
 224
 225 err:
 226         if (reg_vbus)
 227                 regulator_disable(reg_vbus);
 228 put_np:
 229         if (phy_np)
 230                 of_node_put(phy_np);
 231         clk_disable_unprepare(data->clk);
 232         return ret;
 233 }
 234
 235 static int ci13xxx_imx_remove(struct platform_device *pdev)
 236 {
 237         struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);
 238
 239         pm_runtime_disable(&pdev->dev);
 240         ci13xxx_remove_device(data->ci_pdev);
 241
 242         if (data->reg_vbus)
 243                 regulator_disable(data->reg_vbus);
 244
 245         if (data->phy) {
 246                 usb_phy_shutdown(data->phy);
 247                 module_put(data->phy->dev->driver->owner);
 248         }
 249
 250         of_node_put(data->phy_np);
 251
 252         clk_disable_unprepare(data->clk);
 253
 254         platform_set_drvdata(pdev, NULL);
 255
 256         return 0;
 257 }
 258
 259 static const struct of_device_id ci13xxx_imx_dt_ids[] = {
 260         { .compatible = "fsl,imx27-usb", },
 261         { /* sentinel */ }
 262 };
 263 MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);
 264
 265 static struct platform_driver ci13xxx_imx_driver = {
 266         .probe = ci13xxx_imx_probe,
 267         .remove = ci13xxx_imx_remove,
 268         .driver = {
 269                 .name = "imx_usb",
 270                 .owner = THIS_MODULE,
 271                 .of_match_table = ci13xxx_imx_dt_ids,
 272          },
 273 };
 274
 275 module_platform_driver(ci13xxx_imx_driver);
 276
 277 MODULE_ALIAS("platform:imx-usb");
 278 MODULE_LICENSE("GPL v2");
 279 MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
 280 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 281 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");