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 23 #include "ci.h" 24 #include "ci_hdrc_imx.h" 25 26 struct ci_hdrc_imx_data { 27 struct usb_phy *phy; 28 struct platform_device *ci_pdev; 29 struct clk *clk; 30 struct imx_usbmisc_data *usbmisc_data; 31 }; 32 33 /* Common functions shared by usbmisc drivers */ 34 35 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev) 36 { 37 struct device_node *np = dev->of_node; 38 struct of_phandle_args args; 39 struct imx_usbmisc_data *data; 40 int ret; 41 42 /* 43 * In case the fsl,usbmisc property is not present this device doesn't 44 * need usbmisc. Return NULL (which is no error here) 45 */ 46 if (!of_get_property(np, "fsl,usbmisc", NULL)) 47 return NULL; 48 49 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 50 if (!data) 51 return ERR_PTR(-ENOMEM); 52 53 ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", 54 0, &args); 55 if (ret) { 56 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", 57 ret); 58 return ERR_PTR(ret); 59 } 60 61 data->index = args.args[0]; 62 of_node_put(args.np); 63 64 if (of_find_property(np, "disable-over-current", NULL)) 65 data->disable_oc = 1; 66 67 if (of_find_property(np, "external-vbus-divider", NULL)) 68 data->evdo = 1; 69 70 return data; 71 } 72 73 /* End of common functions shared by usbmisc drivers*/ 74 75 static int ci_hdrc_imx_probe(struct platform_device *pdev) 76 { 77 struct ci_hdrc_imx_data *data; 78 struct ci_hdrc_platform_data pdata = { 79 .name = "ci_hdrc_imx", 80 .capoffset = DEF_CAPOFFSET, 81 .flags = CI_HDRC_REQUIRE_TRANSCEIVER | 82 CI_HDRC_DISABLE_STREAMING, 83 }; 84 int ret; 85 86 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 87 if (!data) { 88 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); 89 return -ENOMEM; 90 } 91 92 data->usbmisc_data = usbmisc_get_init_data(&pdev->dev); 93 if (IS_ERR(data->usbmisc_data)) 94 return PTR_ERR(data->usbmisc_data); 95 96 data->clk = devm_clk_get(&pdev->dev, NULL); 97 if (IS_ERR(data->clk)) { 98 dev_err(&pdev->dev, 99 "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); 100 return PTR_ERR(data->clk); 101 } 102 103 ret = clk_prepare_enable(data->clk); 104 if (ret) { 105 dev_err(&pdev->dev, 106 "Failed to prepare or enable clock, err=%d\n", ret); 107 return ret; 108 } 109 110 data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0); 111 if (IS_ERR(data->phy)) { 112 ret = PTR_ERR(data->phy); 113 goto err_clk; 114 } 115 116 pdata.phy = data->phy; 117 118 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 119 if (ret) 120 goto err_clk; 121 122 if (data->usbmisc_data) { 123 ret = imx_usbmisc_init(data->usbmisc_data); 124 if (ret) { 125 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", 126 ret); 127 goto err_clk; 128 } 129 } 130 131 data->ci_pdev = ci_hdrc_add_device(&pdev->dev, 132 pdev->resource, pdev->num_resources, 133 &pdata); 134 if (IS_ERR(data->ci_pdev)) { 135 ret = PTR_ERR(data->ci_pdev); 136 dev_err(&pdev->dev, 137 "Can't register ci_hdrc platform device, err=%d\n", 138 ret); 139 goto err_clk; 140 } 141 142 if (data->usbmisc_data) { 143 ret = imx_usbmisc_init_post(data->usbmisc_data); 144 if (ret) { 145 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", 146 ret); 147 goto disable_device; 148 } 149 } 150 151 platform_set_drvdata(pdev, data); 152 153 pm_runtime_no_callbacks(&pdev->dev); 154 pm_runtime_enable(&pdev->dev); 155 156 return 0; 157 158 disable_device: 159 ci_hdrc_remove_device(data->ci_pdev); 160 err_clk: 161 clk_disable_unprepare(data->clk); 162 return ret; 163 } 164 165 static int ci_hdrc_imx_remove(struct platform_device *pdev) 166 { 167 struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev); 168 169 pm_runtime_disable(&pdev->dev); 170 ci_hdrc_remove_device(data->ci_pdev); 171 clk_disable_unprepare(data->clk); 172 173 return 0; 174 } 175 176 static const struct of_device_id ci_hdrc_imx_dt_ids[] = { 177 { .compatible = "fsl,imx27-usb", }, 178 { /* sentinel */ } 179 }; 180 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids); 181 182 static struct platform_driver ci_hdrc_imx_driver = { 183 .probe = ci_hdrc_imx_probe, 184 .remove = ci_hdrc_imx_remove, 185 .driver = { 186 .name = "imx_usb", 187 .owner = THIS_MODULE, 188 .of_match_table = ci_hdrc_imx_dt_ids, 189 }, 190 }; 191 192 module_platform_driver(ci_hdrc_imx_driver); 193 194 MODULE_ALIAS("platform:imx-usb"); 195 MODULE_LICENSE("GPL v2"); 196 MODULE_DESCRIPTION("CI HDRC i.MX USB binding"); 197 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 198 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 199