1 // SPDX-License-Identifier: GPL-2.0
3 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com
8 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/usb/otg.h>
17 #include <linux/usb/usb_phy_generic.h>
19 #include <linux/of_platform.h>
20 #include <linux/regulator/consumer.h>
23 struct platform_device *usb2_phy;
24 struct platform_device *usb3_phy;
29 struct clk *axius_clk;
31 struct regulator *vdd33;
32 struct regulator *vdd10;
35 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
37 struct usb_phy_generic_platform_data pdata;
38 struct platform_device *pdev;
41 memset(&pdata, 0x00, sizeof(pdata));
43 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
47 exynos->usb2_phy = pdev;
48 pdata.type = USB_PHY_TYPE_USB2;
49 pdata.gpio_reset = -1;
51 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
55 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
61 exynos->usb3_phy = pdev;
62 pdata.type = USB_PHY_TYPE_USB3;
64 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
68 ret = platform_device_add(exynos->usb2_phy);
72 ret = platform_device_add(exynos->usb3_phy);
79 platform_device_del(exynos->usb2_phy);
82 platform_device_put(exynos->usb3_phy);
85 platform_device_put(exynos->usb2_phy);
90 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
92 struct platform_device *pdev = to_platform_device(dev);
94 platform_device_unregister(pdev);
99 static int dwc3_exynos_probe(struct platform_device *pdev)
101 struct dwc3_exynos *exynos;
102 struct device *dev = &pdev->dev;
103 struct device_node *node = dev->of_node;
107 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
111 platform_set_drvdata(pdev, exynos);
115 exynos->clk = devm_clk_get(dev, "usbdrd30");
116 if (IS_ERR(exynos->clk)) {
117 dev_err(dev, "couldn't get clock\n");
120 ret = clk_prepare_enable(exynos->clk);
124 exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
125 if (IS_ERR(exynos->susp_clk))
126 exynos->susp_clk = NULL;
127 ret = clk_prepare_enable(exynos->susp_clk);
131 if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
132 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
133 if (IS_ERR(exynos->axius_clk)) {
134 dev_err(dev, "no AXI UpScaler clk specified\n");
138 ret = clk_prepare_enable(exynos->axius_clk);
142 exynos->axius_clk = NULL;
145 exynos->vdd33 = devm_regulator_get(dev, "vdd33");
146 if (IS_ERR(exynos->vdd33)) {
147 ret = PTR_ERR(exynos->vdd33);
150 ret = regulator_enable(exynos->vdd33);
152 dev_err(dev, "Failed to enable VDD33 supply\n");
156 exynos->vdd10 = devm_regulator_get(dev, "vdd10");
157 if (IS_ERR(exynos->vdd10)) {
158 ret = PTR_ERR(exynos->vdd10);
161 ret = regulator_enable(exynos->vdd10);
163 dev_err(dev, "Failed to enable VDD10 supply\n");
167 ret = dwc3_exynos_register_phys(exynos);
169 dev_err(dev, "couldn't register PHYs\n");
174 ret = of_platform_populate(node, NULL, NULL, dev);
176 dev_err(dev, "failed to add dwc3 core\n");
180 dev_err(dev, "no device node, failed to add dwc3 core\n");
188 platform_device_unregister(exynos->usb2_phy);
189 platform_device_unregister(exynos->usb3_phy);
191 regulator_disable(exynos->vdd10);
193 regulator_disable(exynos->vdd33);
195 clk_disable_unprepare(exynos->axius_clk);
197 clk_disable_unprepare(exynos->susp_clk);
199 clk_disable_unprepare(exynos->clk);
203 static int dwc3_exynos_remove(struct platform_device *pdev)
205 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
207 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
208 platform_device_unregister(exynos->usb2_phy);
209 platform_device_unregister(exynos->usb3_phy);
211 clk_disable_unprepare(exynos->axius_clk);
212 clk_disable_unprepare(exynos->susp_clk);
213 clk_disable_unprepare(exynos->clk);
215 regulator_disable(exynos->vdd33);
216 regulator_disable(exynos->vdd10);
221 static const struct of_device_id exynos_dwc3_match[] = {
222 { .compatible = "samsung,exynos5250-dwusb3" },
223 { .compatible = "samsung,exynos7-dwusb3" },
226 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
228 #ifdef CONFIG_PM_SLEEP
229 static int dwc3_exynos_suspend(struct device *dev)
231 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
233 clk_disable(exynos->axius_clk);
234 clk_disable(exynos->clk);
236 regulator_disable(exynos->vdd33);
237 regulator_disable(exynos->vdd10);
242 static int dwc3_exynos_resume(struct device *dev)
244 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
247 ret = regulator_enable(exynos->vdd33);
249 dev_err(dev, "Failed to enable VDD33 supply\n");
252 ret = regulator_enable(exynos->vdd10);
254 dev_err(dev, "Failed to enable VDD10 supply\n");
258 clk_enable(exynos->clk);
259 clk_enable(exynos->axius_clk);
261 /* runtime set active to reflect active state. */
262 pm_runtime_disable(dev);
263 pm_runtime_set_active(dev);
264 pm_runtime_enable(dev);
269 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
270 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
273 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
275 #define DEV_PM_OPS NULL
276 #endif /* CONFIG_PM_SLEEP */
278 static struct platform_driver dwc3_exynos_driver = {
279 .probe = dwc3_exynos_probe,
280 .remove = dwc3_exynos_remove,
282 .name = "exynos-dwc3",
283 .of_match_table = exynos_dwc3_match,
288 module_platform_driver(dwc3_exynos_driver);
290 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
291 MODULE_LICENSE("GPL v2");
292 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");