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 platform_device *misc_pdev; 58 struct device_node *np = dev->of_node; 59 struct of_phandle_args args; 60 struct imx_usbmisc_data *data; 61 int ret; 62 63 /* 64 * In case the fsl,usbmisc property is not present this device doesn't 65 * need usbmisc. Return NULL (which is no error here) 66 */ 67 if (!of_get_property(np, "fsl,usbmisc", NULL)) 68 return NULL; 69 70 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 71 if (!data) 72 return ERR_PTR(-ENOMEM); 73 74 ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", 75 0, &args); 76 if (ret) { 77 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", 78 ret); 79 return ERR_PTR(ret); 80 } 81 82 data->index = args.args[0]; 83 84 misc_pdev = of_find_device_by_node(args.np); 85 of_node_put(args.np); 86 87 if (!misc_pdev) 88 return ERR_PTR(-EPROBE_DEFER); 89 90 data->dev = &misc_pdev->dev; 91 92 if (of_find_property(np, "disable-over-current", NULL)) 93 data->disable_oc = 1; 94 95 if (of_find_property(np, "external-vbus-divider", NULL)) 96 data->evdo = 1; 97 98 return data; 99 } 100 101 /* End of common functions shared by usbmisc drivers*/ 102 103 static int ci_hdrc_imx_probe(struct platform_device *pdev) 104 { 105 struct ci_hdrc_imx_data *data; 106 struct ci_hdrc_platform_data pdata = { 107 .name = dev_name(&pdev->dev), 108 .capoffset = DEF_CAPOFFSET, 109 .flags = CI_HDRC_REQUIRE_TRANSCEIVER | 110 CI_HDRC_DISABLE_STREAMING, 111 }; 112 int ret; 113 const struct of_device_id *of_id = 114 of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev); 115 const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data; 116 117 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 118 if (!data) { 119 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); 120 return -ENOMEM; 121 } 122 123 data->usbmisc_data = usbmisc_get_init_data(&pdev->dev); 124 if (IS_ERR(data->usbmisc_data)) 125 return PTR_ERR(data->usbmisc_data); 126 127 data->clk = devm_clk_get(&pdev->dev, NULL); 128 if (IS_ERR(data->clk)) { 129 dev_err(&pdev->dev, 130 "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); 131 return PTR_ERR(data->clk); 132 } 133 134 ret = clk_prepare_enable(data->clk); 135 if (ret) { 136 dev_err(&pdev->dev, 137 "Failed to prepare or enable clock, err=%d\n", ret); 138 return ret; 139 } 140 141 data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0); 142 if (IS_ERR(data->phy)) { 143 ret = PTR_ERR(data->phy); 144 /* Return -EINVAL if no usbphy is available */ 145 if (ret == -ENODEV) 146 ret = -EINVAL; 147 goto err_clk; 148 } 149 150 pdata.phy = data->phy; 151 152 if (imx_platform_flag->flags & CI_HDRC_IMX_IMX28_WRITE_FIX) 153 pdata.flags |= CI_HDRC_IMX28_WRITE_FIX; 154 155 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 156 if (ret) 157 goto err_clk; 158 159 if (data->usbmisc_data) { 160 ret = imx_usbmisc_init(data->usbmisc_data); 161 if (ret) { 162 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", 163 ret); 164 goto err_clk; 165 } 166 } 167 168 data->ci_pdev = ci_hdrc_add_device(&pdev->dev, 169 pdev->resource, pdev->num_resources, 170 &pdata); 171 if (IS_ERR(data->ci_pdev)) { 172 ret = PTR_ERR(data->ci_pdev); 173 dev_err(&pdev->dev, 174 "Can't register ci_hdrc platform device, err=%d\n", 175 ret); 176 goto err_clk; 177 } 178 179 if (data->usbmisc_data) { 180 ret = imx_usbmisc_init_post(data->usbmisc_data); 181 if (ret) { 182 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", 183 ret); 184 goto disable_device; 185 } 186 } 187 188 platform_set_drvdata(pdev, data); 189 190 pm_runtime_no_callbacks(&pdev->dev); 191 pm_runtime_enable(&pdev->dev); 192 193 return 0; 194 195 disable_device: 196 ci_hdrc_remove_device(data->ci_pdev); 197 err_clk: 198 clk_disable_unprepare(data->clk); 199 return ret; 200 } 201 202 static int ci_hdrc_imx_remove(struct platform_device *pdev) 203 { 204 struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev); 205 206 pm_runtime_disable(&pdev->dev); 207 ci_hdrc_remove_device(data->ci_pdev); 208 clk_disable_unprepare(data->clk); 209 210 return 0; 211 } 212 213 static struct platform_driver ci_hdrc_imx_driver = { 214 .probe = ci_hdrc_imx_probe, 215 .remove = ci_hdrc_imx_remove, 216 .driver = { 217 .name = "imx_usb", 218 .owner = THIS_MODULE, 219 .of_match_table = ci_hdrc_imx_dt_ids, 220 }, 221 }; 222 223 module_platform_driver(ci_hdrc_imx_driver); 224 225 MODULE_ALIAS("platform:imx-usb"); 226 MODULE_LICENSE("GPL v2"); 227 MODULE_DESCRIPTION("CI HDRC i.MX USB binding"); 228 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 229 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 230