2 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/platform_device.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/clk.h>
25 #include <linux/usb/otg.h>
26 #include <linux/usb/usb_phy_generic.h>
28 #include <linux/of_platform.h>
29 #include <linux/regulator/consumer.h>
32 struct platform_device
*usb2_phy
;
33 struct platform_device
*usb3_phy
;
38 struct clk
*axius_clk
;
40 struct regulator
*vdd33
;
41 struct regulator
*vdd10
;
44 static int dwc3_exynos_register_phys(struct dwc3_exynos
*exynos
)
46 struct usb_phy_generic_platform_data pdata
;
47 struct platform_device
*pdev
;
50 memset(&pdata
, 0x00, sizeof(pdata
));
52 pdev
= platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO
);
56 exynos
->usb2_phy
= pdev
;
57 pdata
.type
= USB_PHY_TYPE_USB2
;
58 pdata
.gpio_reset
= -1;
60 ret
= platform_device_add_data(exynos
->usb2_phy
, &pdata
, sizeof(pdata
));
64 pdev
= platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO
);
70 exynos
->usb3_phy
= pdev
;
71 pdata
.type
= USB_PHY_TYPE_USB3
;
73 ret
= platform_device_add_data(exynos
->usb3_phy
, &pdata
, sizeof(pdata
));
77 ret
= platform_device_add(exynos
->usb2_phy
);
81 ret
= platform_device_add(exynos
->usb3_phy
);
88 platform_device_del(exynos
->usb2_phy
);
91 platform_device_put(exynos
->usb3_phy
);
94 platform_device_put(exynos
->usb2_phy
);
99 static int dwc3_exynos_remove_child(struct device
*dev
, void *unused
)
101 struct platform_device
*pdev
= to_platform_device(dev
);
103 platform_device_unregister(pdev
);
108 static int dwc3_exynos_probe(struct platform_device
*pdev
)
110 struct dwc3_exynos
*exynos
;
111 struct device
*dev
= &pdev
->dev
;
112 struct device_node
*node
= dev
->of_node
;
116 exynos
= devm_kzalloc(dev
, sizeof(*exynos
), GFP_KERNEL
);
121 * Right now device-tree probed devices don't get dma_mask set.
122 * Since shared usb code relies on it, set it here for now.
123 * Once we move to full device tree support this will vanish off.
125 ret
= dma_coerce_mask_and_coherent(dev
, DMA_BIT_MASK(32));
129 platform_set_drvdata(pdev
, exynos
);
133 exynos
->clk
= devm_clk_get(dev
, "usbdrd30");
134 if (IS_ERR(exynos
->clk
)) {
135 dev_err(dev
, "couldn't get clock\n");
138 clk_prepare_enable(exynos
->clk
);
140 exynos
->susp_clk
= devm_clk_get(dev
, "usbdrd30_susp_clk");
141 if (IS_ERR(exynos
->susp_clk
)) {
142 dev_info(dev
, "no suspend clk specified\n");
143 exynos
->susp_clk
= NULL
;
145 clk_prepare_enable(exynos
->susp_clk
);
147 if (of_device_is_compatible(node
, "samsung,exynos7-dwusb3")) {
148 exynos
->axius_clk
= devm_clk_get(dev
, "usbdrd30_axius_clk");
149 if (IS_ERR(exynos
->axius_clk
)) {
150 dev_err(dev
, "no AXI UpScaler clk specified\n");
153 clk_prepare_enable(exynos
->axius_clk
);
155 exynos
->axius_clk
= NULL
;
158 exynos
->vdd33
= devm_regulator_get(dev
, "vdd33");
159 if (IS_ERR(exynos
->vdd33
)) {
160 ret
= PTR_ERR(exynos
->vdd33
);
163 ret
= regulator_enable(exynos
->vdd33
);
165 dev_err(dev
, "Failed to enable VDD33 supply\n");
169 exynos
->vdd10
= devm_regulator_get(dev
, "vdd10");
170 if (IS_ERR(exynos
->vdd10
)) {
171 ret
= PTR_ERR(exynos
->vdd10
);
174 ret
= regulator_enable(exynos
->vdd10
);
176 dev_err(dev
, "Failed to enable VDD10 supply\n");
180 ret
= dwc3_exynos_register_phys(exynos
);
182 dev_err(dev
, "couldn't register PHYs\n");
187 ret
= of_platform_populate(node
, NULL
, NULL
, dev
);
189 dev_err(dev
, "failed to add dwc3 core\n");
193 dev_err(dev
, "no device node, failed to add dwc3 core\n");
201 platform_device_unregister(exynos
->usb2_phy
);
202 platform_device_unregister(exynos
->usb3_phy
);
204 regulator_disable(exynos
->vdd10
);
206 regulator_disable(exynos
->vdd33
);
208 clk_disable_unprepare(exynos
->axius_clk
);
209 clk_disable_unprepare(exynos
->susp_clk
);
210 clk_disable_unprepare(exynos
->clk
);
214 static int dwc3_exynos_remove(struct platform_device
*pdev
)
216 struct dwc3_exynos
*exynos
= platform_get_drvdata(pdev
);
218 device_for_each_child(&pdev
->dev
, NULL
, dwc3_exynos_remove_child
);
219 platform_device_unregister(exynos
->usb2_phy
);
220 platform_device_unregister(exynos
->usb3_phy
);
222 clk_disable_unprepare(exynos
->axius_clk
);
223 clk_disable_unprepare(exynos
->susp_clk
);
224 clk_disable_unprepare(exynos
->clk
);
226 regulator_disable(exynos
->vdd33
);
227 regulator_disable(exynos
->vdd10
);
232 static const struct of_device_id exynos_dwc3_match
[] = {
233 { .compatible
= "samsung,exynos5250-dwusb3" },
234 { .compatible
= "samsung,exynos7-dwusb3" },
237 MODULE_DEVICE_TABLE(of
, exynos_dwc3_match
);
239 #ifdef CONFIG_PM_SLEEP
240 static int dwc3_exynos_suspend(struct device
*dev
)
242 struct dwc3_exynos
*exynos
= dev_get_drvdata(dev
);
244 clk_disable(exynos
->axius_clk
);
245 clk_disable(exynos
->clk
);
247 regulator_disable(exynos
->vdd33
);
248 regulator_disable(exynos
->vdd10
);
253 static int dwc3_exynos_resume(struct device
*dev
)
255 struct dwc3_exynos
*exynos
= dev_get_drvdata(dev
);
258 ret
= regulator_enable(exynos
->vdd33
);
260 dev_err(dev
, "Failed to enable VDD33 supply\n");
263 ret
= regulator_enable(exynos
->vdd10
);
265 dev_err(dev
, "Failed to enable VDD10 supply\n");
269 clk_enable(exynos
->clk
);
270 clk_enable(exynos
->axius_clk
);
272 /* runtime set active to reflect active state. */
273 pm_runtime_disable(dev
);
274 pm_runtime_set_active(dev
);
275 pm_runtime_enable(dev
);
280 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops
= {
281 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend
, dwc3_exynos_resume
)
284 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
286 #define DEV_PM_OPS NULL
287 #endif /* CONFIG_PM_SLEEP */
289 static struct platform_driver dwc3_exynos_driver
= {
290 .probe
= dwc3_exynos_probe
,
291 .remove
= dwc3_exynos_remove
,
293 .name
= "exynos-dwc3",
294 .of_match_table
= exynos_dwc3_match
,
299 module_platform_driver(dwc3_exynos_driver
);
301 MODULE_ALIAS("platform:exynos-dwc3");
302 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
303 MODULE_LICENSE("GPL v2");
304 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");