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
  26 #define pdev_to_phy(pdev) \
  27         ((struct usb_phy *)platform_get_drvdata(pdev))
  28
  29 struct ci13xxx_imx_data {
  30         struct device_node *phy_np;
  31         struct usb_phy *phy;
  32         struct platform_device *ci_pdev;
  33         struct clk *clk;
  34         struct regulator *reg_vbus;
  35 };
  36
  37 static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata  = {
  38         .name                   = "ci13xxx_imx",
  39         .flags                  = CI13XXX_REQUIRE_TRANSCEIVER |
  40                                   CI13XXX_PULLUP_ON_VBUS |
  41                                   CI13XXX_DISABLE_STREAMING,
  42         .capoffset              = DEF_CAPOFFSET,
  43 };
  44
  45 static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
  46 {
  47         struct ci13xxx_imx_data *data;
  48         struct platform_device *plat_ci, *phy_pdev;
  49         struct device_node *phy_np;
  50         struct resource *res;
  51         struct regulator *reg_vbus;
  52         int ret;
  53
  54         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  55         if (!data) {
  56                 dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
  57                 return -ENOMEM;
  58         }
  59
  60         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  61         if (!res) {
  62                 dev_err(&pdev->dev, "Can't get device resources!\n");
  63                 return -ENOENT;
  64         }
  65
  66         data->clk = devm_clk_get(&pdev->dev, NULL);
  67         if (IS_ERR(data->clk)) {
  68                 dev_err(&pdev->dev,
  69                         "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
  70                 return PTR_ERR(data->clk);
  71         }
  72
  73         ret = clk_prepare_enable(data->clk);
  74         if (ret) {
  75                 dev_err(&pdev->dev,
  76                         "Failed to prepare or enable clock, err=%d\n", ret);
  77                 return ret;
  78         }
  79
  80         phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
  81         if (phy_np) {
  82                 data->phy_np = phy_np;
  83                 phy_pdev = of_find_device_by_node(phy_np);
  84                 if (phy_pdev) {
  85                         struct usb_phy *phy;
  86                         phy = pdev_to_phy(phy_pdev);
  87                         if (phy &&
  88                             try_module_get(phy_pdev->dev.driver->owner)) {
  89                                 usb_phy_init(phy);
  90                                 data->phy = phy;
  91                         }
  92                 }
  93         }
  94
  95         /* we only support host now, so enable vbus here */
  96         reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
  97         if (!IS_ERR(reg_vbus)) {
  98                 ret = regulator_enable(reg_vbus);
  99                 if (ret) {
 100                         dev_err(&pdev->dev,
 101                                 "Failed to enable vbus regulator, err=%d\n",
 102                                 ret);
 103                         goto put_np;
 104                 }
 105                 data->reg_vbus = reg_vbus;
 106         } else {
 107                 reg_vbus = NULL;
 108         }
 109
 110         ci13xxx_imx_platdata.phy = data->phy;
 111
 112         if (!pdev->dev.dma_mask) {
 113                 pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
 114                                       sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
 115                 if (!pdev->dev.dma_mask) {
 116                         ret = -ENOMEM;
 117                         dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
 118                         goto err;
 119                 }
 120                 *pdev->dev.dma_mask = DMA_BIT_MASK(32);
 121                 dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
 122         }
 123         plat_ci = ci13xxx_add_device(&pdev->dev,
 124                                 pdev->resource, pdev->num_resources,
 125                                 &ci13xxx_imx_platdata);
 126         if (IS_ERR(plat_ci)) {
 127                 ret = PTR_ERR(plat_ci);
 128                 dev_err(&pdev->dev,
 129                         "Can't register ci_hdrc platform device, err=%d\n",
 130                         ret);
 131                 goto err;
 132         }
 133
 134         data->ci_pdev = plat_ci;
 135         platform_set_drvdata(pdev, data);
 136
 137         pm_runtime_no_callbacks(&pdev->dev);
 138         pm_runtime_enable(&pdev->dev);
 139
 140         return 0;
 141
 142 err:
 143         if (reg_vbus)
 144                 regulator_disable(reg_vbus);
 145 put_np:
 146         if (phy_np)
 147                 of_node_put(phy_np);
 148         clk_disable_unprepare(data->clk);
 149         return ret;
 150 }
 151
 152 static int __devexit ci13xxx_imx_remove(struct platform_device *pdev)
 153 {
 154         struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);
 155
 156         pm_runtime_disable(&pdev->dev);
 157         ci13xxx_remove_device(data->ci_pdev);
 158
 159         if (data->reg_vbus)
 160                 regulator_disable(data->reg_vbus);
 161
 162         if (data->phy) {
 163                 usb_phy_shutdown(data->phy);
 164                 module_put(data->phy->dev->driver->owner);
 165         }
 166
 167         of_node_put(data->phy_np);
 168
 169         clk_disable_unprepare(data->clk);
 170
 171         platform_set_drvdata(pdev, NULL);
 172
 173         return 0;
 174 }
 175
 176 static const struct of_device_id ci13xxx_imx_dt_ids[] = {
 177         { .compatible = "fsl,imx27-usb", },
 178         { /* sentinel */ }
 179 };
 180 MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);
 181
 182 static struct platform_driver ci13xxx_imx_driver = {
 183         .probe = ci13xxx_imx_probe,
 184         .remove = __devexit_p(ci13xxx_imx_remove),
 185         .driver = {
 186                 .name = "imx_usb",
 187                 .owner = THIS_MODULE,
 188                 .of_match_table = ci13xxx_imx_dt_ids,
 189          },
 190 };
 191
 192 module_platform_driver(ci13xxx_imx_driver);
 193
 194 MODULE_ALIAS("platform:imx-usb");
 195 MODULE_LICENSE("GPL v2");
 196 MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
 197 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 198 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");