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 #define CI_HDRC_IMX_IMX28_WRITE_FIX BIT(0) 27 28 struct ci_hdrc_imx_platform_flag { 29 unsigned int flags; 30 }; 31 32 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = { 33 }; 34 35 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = { 36 .flags = CI_HDRC_IMX_IMX28_WRITE_FIX, 37 }; 38 39 static const struct of_device_id ci_hdrc_imx_dt_ids[] = { 40 { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data}, 41 { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data}, 42 { /* sentinel */ } 43 }; 44 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids); 45 46 struct ci_hdrc_imx_data { 47 struct usb_phy *phy; 48 struct platform_device *ci_pdev; 49 struct clk *clk; 50 struct imx_usbmisc_data *usbmisc_data; 51 }; 52 53 /* Common functions shared by usbmisc drivers */ 54 55 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev) 56 { 57 struct device_node *np = dev->of_node; 58 struct of_phandle_args args; 59 struct imx_usbmisc_data *data; 60 int ret; 61 62 /* 63 * In case the fsl,usbmisc property is not present this device doesn't 64 * need usbmisc. Return NULL (which is no error here) 65 */ 66 if (!of_get_property(np, "fsl,usbmisc", NULL)) 67 return NULL; 68 69 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 70 if (!data) 71 return ERR_PTR(-ENOMEM); 72 73 ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", 74 0, &args); 75 if (ret) { 76 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", 77 ret); 78 return ERR_PTR(ret); 79 } 80 81 data->index = args.args[0]; 82 of_node_put(args.np); 83 84 if (of_find_property(np, "disable-over-current", NULL)) 85 data->disable_oc = 1; 86 87 if (of_find_property(np, "external-vbus-divider", NULL)) 88 data->evdo = 1; 89 90 return data; 91 } 92 93 /* End of common functions shared by usbmisc drivers*/ 94 95 static int ci_hdrc_imx_probe(struct platform_device *pdev) 96 { 97 struct ci_hdrc_imx_data *data; 98 struct ci_hdrc_platform_data pdata = { 99 .name = dev_name(&pdev->dev), 100 .capoffset = DEF_CAPOFFSET, 101 .flags = CI_HDRC_REQUIRE_TRANSCEIVER | 102 CI_HDRC_DISABLE_STREAMING, 103 }; 104 int ret; 105 const struct of_device_id *of_id = 106 of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev); 107 const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data; 108 109 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 110 if (!data) { 111 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); 112 return -ENOMEM; 113 } 114 115 data->usbmisc_data = usbmisc_get_init_data(&pdev->dev); 116 if (IS_ERR(data->usbmisc_data)) 117 return PTR_ERR(data->usbmisc_data); 118 119 data->clk = devm_clk_get(&pdev->dev, NULL); 120 if (IS_ERR(data->clk)) { 121 dev_err(&pdev->dev, 122 "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); 123 return PTR_ERR(data->clk); 124 } 125 126 ret = clk_prepare_enable(data->clk); 127 if (ret) { 128 dev_err(&pdev->dev, 129 "Failed to prepare or enable clock, err=%d\n", ret); 130 return ret; 131 } 132 133 data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0); 134 if (IS_ERR(data->phy)) { 135 ret = PTR_ERR(data->phy); 136 goto err_clk; 137 } 138 139 pdata.phy = data->phy; 140 141 if (imx_platform_flag->flags & CI_HDRC_IMX_IMX28_WRITE_FIX) 142 pdata.flags |= CI_HDRC_IMX28_WRITE_FIX; 143 144 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 145 if (ret) 146 goto err_clk; 147 148 if (data->usbmisc_data) { 149 ret = imx_usbmisc_init(data->usbmisc_data); 150 if (ret) { 151 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", 152 ret); 153 goto err_clk; 154 } 155 } 156 157 data->ci_pdev = ci_hdrc_add_device(&pdev->dev, 158 pdev->resource, pdev->num_resources, 159 &pdata); 160 if (IS_ERR(data->ci_pdev)) { 161 ret = PTR_ERR(data->ci_pdev); 162 dev_err(&pdev->dev, 163 "Can't register ci_hdrc platform device, err=%d\n", 164 ret); 165 goto err_clk; 166 } 167 168 if (data->usbmisc_data) { 169 ret = imx_usbmisc_init_post(data->usbmisc_data); 170 if (ret) { 171 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", 172 ret); 173 goto disable_device; 174 } 175 } 176 177 platform_set_drvdata(pdev, data); 178 179 pm_runtime_no_callbacks(&pdev->dev); 180 pm_runtime_enable(&pdev->dev); 181 182 return 0; 183 184 disable_device: 185 ci_hdrc_remove_device(data->ci_pdev); 186 err_clk: 187 clk_disable_unprepare(data->clk); 188 return ret; 189 } 190 191 static int ci_hdrc_imx_remove(struct platform_device *pdev) 192 { 193 struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev); 194 195 pm_runtime_disable(&pdev->dev); 196 ci_hdrc_remove_device(data->ci_pdev); 197 clk_disable_unprepare(data->clk); 198 199 return 0; 200 } 201 202 static struct platform_driver ci_hdrc_imx_driver = { 203 .probe = ci_hdrc_imx_probe, 204 .remove = ci_hdrc_imx_remove, 205 .driver = { 206 .name = "imx_usb", 207 .owner = THIS_MODULE, 208 .of_match_table = ci_hdrc_imx_dt_ids, 209 }, 210 }; 211 212 module_platform_driver(ci_hdrc_imx_driver); 213 214 MODULE_ALIAS("platform:imx-usb"); 215 MODULE_LICENSE("GPL v2"); 216 MODULE_DESCRIPTION("CI HDRC i.MX USB binding"); 217 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 218 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 219