Anton Tikhomirov | d28a968 | 2012-02-15 17:04:56 +0900 | [diff] [blame^] | 1 | /** |
| 2 | * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer |
| 3 | * |
| 4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| 5 | * http://www.samsung.com |
| 6 | * |
| 7 | * Author: Anton Tikhomirov <av.tikhomirov@samsung.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/platform_data/dwc3-exynos.h> |
| 20 | #include <linux/dma-mapping.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/clk.h> |
| 23 | |
| 24 | #include "core.h" |
| 25 | |
| 26 | struct dwc3_exynos { |
| 27 | struct platform_device *dwc3; |
| 28 | struct device *dev; |
| 29 | |
| 30 | struct clk *clk; |
| 31 | }; |
| 32 | |
| 33 | static int __devinit dwc3_exynos_probe(struct platform_device *pdev) |
| 34 | { |
| 35 | struct dwc3_exynos_data *pdata = pdev->dev.platform_data; |
| 36 | struct platform_device *dwc3; |
| 37 | struct dwc3_exynos *exynos; |
| 38 | struct clk *clk; |
| 39 | |
| 40 | int devid; |
| 41 | int ret = -ENOMEM; |
| 42 | |
| 43 | exynos = kzalloc(sizeof(*exynos), GFP_KERNEL); |
| 44 | if (!exynos) { |
| 45 | dev_err(&pdev->dev, "not enough memory\n"); |
| 46 | goto err0; |
| 47 | } |
| 48 | |
| 49 | platform_set_drvdata(pdev, exynos); |
| 50 | |
| 51 | devid = dwc3_get_device_id(); |
| 52 | if (devid < 0) |
| 53 | goto err1; |
| 54 | |
| 55 | dwc3 = platform_device_alloc("dwc3", devid); |
| 56 | if (!dwc3) { |
| 57 | dev_err(&pdev->dev, "couldn't allocate dwc3 device\n"); |
| 58 | goto err2; |
| 59 | } |
| 60 | |
| 61 | clk = clk_get(&pdev->dev, "usbdrd30"); |
| 62 | if (IS_ERR(clk)) { |
| 63 | dev_err(&pdev->dev, "couldn't get clock\n"); |
| 64 | ret = -EINVAL; |
| 65 | goto err3; |
| 66 | } |
| 67 | |
| 68 | dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask); |
| 69 | |
| 70 | dwc3->dev.parent = &pdev->dev; |
| 71 | dwc3->dev.dma_mask = pdev->dev.dma_mask; |
| 72 | dwc3->dev.dma_parms = pdev->dev.dma_parms; |
| 73 | exynos->dwc3 = dwc3; |
| 74 | exynos->dev = &pdev->dev; |
| 75 | exynos->clk = clk; |
| 76 | |
| 77 | clk_enable(exynos->clk); |
| 78 | |
| 79 | /* PHY initialization */ |
| 80 | if (!pdata) { |
| 81 | dev_dbg(&pdev->dev, "missing platform data\n"); |
| 82 | } else { |
| 83 | if (pdata->phy_init) |
| 84 | pdata->phy_init(pdev, pdata->phy_type); |
| 85 | } |
| 86 | |
| 87 | ret = platform_device_add_resources(dwc3, pdev->resource, |
| 88 | pdev->num_resources); |
| 89 | if (ret) { |
| 90 | dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n"); |
| 91 | goto err4; |
| 92 | } |
| 93 | |
| 94 | ret = platform_device_add(dwc3); |
| 95 | if (ret) { |
| 96 | dev_err(&pdev->dev, "failed to register dwc3 device\n"); |
| 97 | goto err4; |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | |
| 102 | err4: |
| 103 | if (pdata && pdata->phy_exit) |
| 104 | pdata->phy_exit(pdev, pdata->phy_type); |
| 105 | |
| 106 | clk_disable(clk); |
| 107 | clk_put(clk); |
| 108 | err3: |
| 109 | platform_device_put(dwc3); |
| 110 | err2: |
| 111 | dwc3_put_device_id(devid); |
| 112 | err1: |
| 113 | kfree(exynos); |
| 114 | err0: |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | static int __devexit dwc3_exynos_remove(struct platform_device *pdev) |
| 119 | { |
| 120 | struct dwc3_exynos *exynos = platform_get_drvdata(pdev); |
| 121 | struct dwc3_exynos_data *pdata = pdev->dev.platform_data; |
| 122 | |
| 123 | platform_device_unregister(exynos->dwc3); |
| 124 | |
| 125 | dwc3_put_device_id(exynos->dwc3->id); |
| 126 | |
| 127 | if (pdata && pdata->phy_exit) |
| 128 | pdata->phy_exit(pdev, pdata->phy_type); |
| 129 | |
| 130 | clk_disable(exynos->clk); |
| 131 | clk_put(exynos->clk); |
| 132 | |
| 133 | kfree(exynos); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static struct platform_driver dwc3_exynos_driver = { |
| 139 | .probe = dwc3_exynos_probe, |
| 140 | .remove = __devexit_p(dwc3_exynos_remove), |
| 141 | .driver = { |
| 142 | .name = "exynos-dwc3", |
| 143 | }, |
| 144 | }; |
| 145 | |
| 146 | module_platform_driver(dwc3_exynos_driver); |
| 147 | |
| 148 | MODULE_ALIAS("platform:exynos-dwc3"); |
| 149 | MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>"); |
| 150 | MODULE_LICENSE("GPL"); |
| 151 | MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer"); |