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/clk.h> 22 #include <linux/usb/otg.h> 23 #include <linux/usb/nop-usb-xceiv.h> 24 25 #include "core.h" 26 27 struct dwc3_exynos { 28 struct platform_device *dwc3; 29 struct platform_device *usb2_phy; 30 struct platform_device *usb3_phy; 31 struct device *dev; 32 33 struct clk *clk; 34 }; 35 36 static int __devinit dwc3_exynos_register_phys(struct dwc3_exynos *exynos) 37 { 38 struct nop_usb_xceiv_platform_data pdata; 39 struct platform_device *pdev; 40 int ret; 41 42 memset(&pdata, 0x00, sizeof(pdata)); 43 44 pdev = platform_device_alloc("nop_usb_xceiv", 0); 45 if (!pdev) 46 return -ENOMEM; 47 48 exynos->usb2_phy = pdev; 49 pdata.type = USB_PHY_TYPE_USB2; 50 51 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata)); 52 if (ret) 53 goto err1; 54 55 pdev = platform_device_alloc("nop_usb_xceiv", 1); 56 if (!pdev) { 57 ret = -ENOMEM; 58 goto err1; 59 } 60 61 exynos->usb3_phy = pdev; 62 pdata.type = USB_PHY_TYPE_USB3; 63 64 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata)); 65 if (ret) 66 goto err2; 67 68 ret = platform_device_add(exynos->usb2_phy); 69 if (ret) 70 goto err2; 71 72 ret = platform_device_add(exynos->usb3_phy); 73 if (ret) 74 goto err3; 75 76 return 0; 77 78 err3: 79 platform_device_del(exynos->usb2_phy); 80 81 err2: 82 platform_device_put(exynos->usb3_phy); 83 84 err1: 85 platform_device_put(exynos->usb2_phy); 86 87 return ret; 88 } 89 90 static int __devinit dwc3_exynos_probe(struct platform_device *pdev) 91 { 92 struct dwc3_exynos_data *pdata = pdev->dev.platform_data; 93 struct platform_device *dwc3; 94 struct dwc3_exynos *exynos; 95 struct clk *clk; 96 97 int devid; 98 int ret = -ENOMEM; 99 100 exynos = kzalloc(sizeof(*exynos), GFP_KERNEL); 101 if (!exynos) { 102 dev_err(&pdev->dev, "not enough memory\n"); 103 goto err0; 104 } 105 106 platform_set_drvdata(pdev, exynos); 107 108 devid = dwc3_get_device_id(); 109 if (devid < 0) 110 goto err1; 111 112 ret = dwc3_exynos_register_phys(exynos); 113 if (ret) { 114 dev_err(&pdev->dev, "couldn't register PHYs\n"); 115 goto err1; 116 } 117 118 dwc3 = platform_device_alloc("dwc3", devid); 119 if (!dwc3) { 120 dev_err(&pdev->dev, "couldn't allocate dwc3 device\n"); 121 goto err2; 122 } 123 124 clk = clk_get(&pdev->dev, "usbdrd30"); 125 if (IS_ERR(clk)) { 126 dev_err(&pdev->dev, "couldn't get clock\n"); 127 ret = -EINVAL; 128 goto err3; 129 } 130 131 dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask); 132 133 dwc3->dev.parent = &pdev->dev; 134 dwc3->dev.dma_mask = pdev->dev.dma_mask; 135 dwc3->dev.dma_parms = pdev->dev.dma_parms; 136 exynos->dwc3 = dwc3; 137 exynos->dev = &pdev->dev; 138 exynos->clk = clk; 139 140 clk_enable(exynos->clk); 141 142 /* PHY initialization */ 143 if (!pdata) { 144 dev_dbg(&pdev->dev, "missing platform data\n"); 145 } else { 146 if (pdata->phy_init) 147 pdata->phy_init(pdev, pdata->phy_type); 148 } 149 150 ret = platform_device_add_resources(dwc3, pdev->resource, 151 pdev->num_resources); 152 if (ret) { 153 dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n"); 154 goto err4; 155 } 156 157 ret = platform_device_add(dwc3); 158 if (ret) { 159 dev_err(&pdev->dev, "failed to register dwc3 device\n"); 160 goto err4; 161 } 162 163 return 0; 164 165 err4: 166 if (pdata && pdata->phy_exit) 167 pdata->phy_exit(pdev, pdata->phy_type); 168 169 clk_disable(clk); 170 clk_put(clk); 171 err3: 172 platform_device_put(dwc3); 173 err2: 174 dwc3_put_device_id(devid); 175 err1: 176 kfree(exynos); 177 err0: 178 return ret; 179 } 180 181 static int __devexit dwc3_exynos_remove(struct platform_device *pdev) 182 { 183 struct dwc3_exynos *exynos = platform_get_drvdata(pdev); 184 struct dwc3_exynos_data *pdata = pdev->dev.platform_data; 185 186 platform_device_unregister(exynos->dwc3); 187 platform_device_unregister(exynos->usb2_phy); 188 platform_device_unregister(exynos->usb3_phy); 189 190 dwc3_put_device_id(exynos->dwc3->id); 191 192 if (pdata && pdata->phy_exit) 193 pdata->phy_exit(pdev, pdata->phy_type); 194 195 clk_disable(exynos->clk); 196 clk_put(exynos->clk); 197 198 kfree(exynos); 199 200 return 0; 201 } 202 203 static struct platform_driver dwc3_exynos_driver = { 204 .probe = dwc3_exynos_probe, 205 .remove = __devexit_p(dwc3_exynos_remove), 206 .driver = { 207 .name = "exynos-dwc3", 208 }, 209 }; 210 211 module_platform_driver(dwc3_exynos_driver); 212 213 MODULE_ALIAS("platform:exynos-dwc3"); 214 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>"); 215 MODULE_LICENSE("GPL"); 216 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer"); 217