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 #include <linux/regulator/consumer.h> 23 24 #include "ci.h" 25 #include "ci_hdrc_imx.h" 26 27 #define pdev_to_phy(pdev) \ 28 ((struct usb_phy *)platform_get_drvdata(pdev)) 29 30 struct ci_hdrc_imx_data { 31 struct usb_phy *phy; 32 struct platform_device *ci_pdev; 33 struct clk *clk; 34 struct regulator *reg_vbus; 35 }; 36 37 static const struct usbmisc_ops *usbmisc_ops; 38 39 /* Common functions shared by usbmisc drivers */ 40 41 int usbmisc_set_ops(const struct usbmisc_ops *ops) 42 { 43 if (usbmisc_ops) 44 return -EBUSY; 45 46 usbmisc_ops = ops; 47 48 return 0; 49 } 50 EXPORT_SYMBOL_GPL(usbmisc_set_ops); 51 52 void usbmisc_unset_ops(const struct usbmisc_ops *ops) 53 { 54 usbmisc_ops = NULL; 55 } 56 EXPORT_SYMBOL_GPL(usbmisc_unset_ops); 57 58 int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev) 59 { 60 struct device_node *np = dev->of_node; 61 struct of_phandle_args args; 62 int ret; 63 64 usbdev->dev = dev; 65 66 ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", 67 0, &args); 68 if (ret) { 69 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", 70 ret); 71 memset(usbdev, 0, sizeof(*usbdev)); 72 return ret; 73 } 74 usbdev->index = args.args[0]; 75 of_node_put(args.np); 76 77 if (of_find_property(np, "disable-over-current", NULL)) 78 usbdev->disable_oc = 1; 79 80 if (of_find_property(np, "external-vbus-divider", NULL)) 81 usbdev->evdo = 1; 82 83 return 0; 84 } 85 EXPORT_SYMBOL_GPL(usbmisc_get_init_data); 86 87 /* End of common functions shared by usbmisc drivers*/ 88 89 static int ci_hdrc_imx_probe(struct platform_device *pdev) 90 { 91 struct ci_hdrc_imx_data *data; 92 struct ci_hdrc_platform_data pdata = { 93 .name = "ci_hdrc_imx", 94 .capoffset = DEF_CAPOFFSET, 95 .flags = CI_HDRC_REQUIRE_TRANSCEIVER | 96 CI_HDRC_PULLUP_ON_VBUS | 97 CI_HDRC_DISABLE_STREAMING, 98 }; 99 struct resource *res; 100 int ret; 101 102 if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL) 103 && !usbmisc_ops) 104 return -EPROBE_DEFER; 105 106 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 107 if (!data) { 108 dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); 109 return -ENOMEM; 110 } 111 112 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 113 if (!res) { 114 dev_err(&pdev->dev, "Can't get device resources!\n"); 115 return -ENOENT; 116 } 117 118 data->clk = devm_clk_get(&pdev->dev, NULL); 119 if (IS_ERR(data->clk)) { 120 dev_err(&pdev->dev, 121 "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); 122 return PTR_ERR(data->clk); 123 } 124 125 ret = clk_prepare_enable(data->clk); 126 if (ret) { 127 dev_err(&pdev->dev, 128 "Failed to prepare or enable clock, err=%d\n", ret); 129 return ret; 130 } 131 132 data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0); 133 if (!IS_ERR(data->phy)) { 134 ret = usb_phy_init(data->phy); 135 if (ret) { 136 dev_err(&pdev->dev, "unable to init phy: %d\n", ret); 137 goto err_clk; 138 } 139 } else if (PTR_ERR(data->phy) == -EPROBE_DEFER) { 140 ret = -EPROBE_DEFER; 141 goto err_clk; 142 } 143 144 /* we only support host now, so enable vbus here */ 145 data->reg_vbus = devm_regulator_get(&pdev->dev, "vbus"); 146 if (!IS_ERR(data->reg_vbus)) { 147 ret = regulator_enable(data->reg_vbus); 148 if (ret) { 149 dev_err(&pdev->dev, 150 "Failed to enable vbus regulator, err=%d\n", 151 ret); 152 goto err_clk; 153 } 154 } else { 155 data->reg_vbus = NULL; 156 } 157 158 pdata.phy = data->phy; 159 160 if (!pdev->dev.dma_mask) 161 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 162 if (!pdev->dev.coherent_dma_mask) 163 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 164 165 if (usbmisc_ops && usbmisc_ops->init) { 166 ret = usbmisc_ops->init(&pdev->dev); 167 if (ret) { 168 dev_err(&pdev->dev, 169 "usbmisc init failed, ret=%d\n", ret); 170 goto err; 171 } 172 } 173 174 data->ci_pdev = ci_hdrc_add_device(&pdev->dev, 175 pdev->resource, pdev->num_resources, 176 &pdata); 177 if (IS_ERR(data->ci_pdev)) { 178 ret = PTR_ERR(data->ci_pdev); 179 dev_err(&pdev->dev, 180 "Can't register ci_hdrc platform device, err=%d\n", 181 ret); 182 goto err; 183 } 184 185 if (usbmisc_ops && usbmisc_ops->post) { 186 ret = usbmisc_ops->post(&pdev->dev); 187 if (ret) { 188 dev_err(&pdev->dev, 189 "usbmisc post failed, ret=%d\n", ret); 190 goto disable_device; 191 } 192 } 193 194 platform_set_drvdata(pdev, data); 195 196 pm_runtime_no_callbacks(&pdev->dev); 197 pm_runtime_enable(&pdev->dev); 198 199 return 0; 200 201 disable_device: 202 ci_hdrc_remove_device(data->ci_pdev); 203 err: 204 if (data->reg_vbus) 205 regulator_disable(data->reg_vbus); 206 err_clk: 207 clk_disable_unprepare(data->clk); 208 return ret; 209 } 210 211 static int ci_hdrc_imx_remove(struct platform_device *pdev) 212 { 213 struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev); 214 215 pm_runtime_disable(&pdev->dev); 216 ci_hdrc_remove_device(data->ci_pdev); 217 218 if (data->reg_vbus) 219 regulator_disable(data->reg_vbus); 220 221 if (data->phy) { 222 usb_phy_shutdown(data->phy); 223 module_put(data->phy->dev->driver->owner); 224 } 225 226 clk_disable_unprepare(data->clk); 227 228 return 0; 229 } 230 231 static const struct of_device_id ci_hdrc_imx_dt_ids[] = { 232 { .compatible = "fsl,imx27-usb", }, 233 { /* sentinel */ } 234 }; 235 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids); 236 237 static struct platform_driver ci_hdrc_imx_driver = { 238 .probe = ci_hdrc_imx_probe, 239 .remove = ci_hdrc_imx_remove, 240 .driver = { 241 .name = "imx_usb", 242 .owner = THIS_MODULE, 243 .of_match_table = ci_hdrc_imx_dt_ids, 244 }, 245 }; 246 247 module_platform_driver(ci_hdrc_imx_driver); 248 249 MODULE_ALIAS("platform:imx-usb"); 250 MODULE_LICENSE("GPL v2"); 251 MODULE_DESCRIPTION("CI HDRC i.MX USB binding"); 252 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 253 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 254