1 // SPDX-License-Identifier: GPL-2.0
3  * dwc3-rtk.c - Realtek DWC3 Specific Glue layer
19 #include <linux/usb/role.h>
65 static void switch_usb2_role(struct dwc3_rtk *rtk, enum usb_role role)  in switch_usb2_role()  argument
70 	reg = rtk->regs + WRAP_USB2_PHY_REG;  in switch_usb2_role()
73 	switch (role) {  in switch_usb2_role()
80 	default:  in switch_usb2_role()
81 		dev_dbg(rtk->dev, "%s: role=%d\n", __func__, role);  in switch_usb2_role()
86 static void switch_dwc3_role(struct dwc3_rtk *rtk, enum usb_role role)  in switch_dwc3_role()  argument
88 	if (!rtk->dwc->role_sw)  in switch_dwc3_role()
91 	usb_role_switch_set_role(rtk->dwc->role_sw, role);  in switch_dwc3_role()
96 	enum usb_role role;  in dwc3_rtk_get_role()  local
98 	role = rtk->cur_role;  in dwc3_rtk_get_role()
100 	if (rtk->dwc && rtk->dwc->role_sw)  in dwc3_rtk_get_role()
101 		role = usb_role_switch_get_role(rtk->dwc->role_sw);  in dwc3_rtk_get_role()
103 		dev_dbg(rtk->dev, "%s not usb_role_switch role=%d\n", __func__, role);  in dwc3_rtk_get_role()
105 	return role;  in dwc3_rtk_get_role()
108 static void dwc3_rtk_set_role(struct dwc3_rtk *rtk, enum usb_role role)  in dwc3_rtk_set_role()  argument
110 	rtk->cur_role = role;  in dwc3_rtk_set_role()
112 	switch_dwc3_role(rtk, role);  in dwc3_rtk_set_role()
114 	switch_usb2_role(rtk, role);  in dwc3_rtk_set_role()
118 static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)  in dwc3_usb_role_switch_set()  argument
122 	dwc3_rtk_set_role(rtk, role);  in dwc3_usb_role_switch_set()
138 	dwc3_role_switch.name = dev_name(rtk->dev);  in dwc3_rtk_setup_role_switch()
141 	dwc3_role_switch.fwnode = dev_fwnode(rtk->dev);  in dwc3_rtk_setup_role_switch()
144 	rtk->role_switch = usb_role_switch_register(rtk->dev, &dwc3_role_switch);  in dwc3_rtk_setup_role_switch()
145 	if (IS_ERR(rtk->role_switch))  in dwc3_rtk_setup_role_switch()
146 		return PTR_ERR(rtk->role_switch);  in dwc3_rtk_setup_role_switch()
153 	if (rtk->role_switch)  in dwc3_rtk_remove_role_switch()
154 		usb_role_switch_unregister(rtk->role_switch);  in dwc3_rtk_remove_role_switch()
156 	rtk->role_switch = NULL;  in dwc3_rtk_remove_role_switch()
167 	[USB_SPEED_LOW] = "low-speed",
168 	[USB_SPEED_FULL] = "full-speed",
169 	[USB_SPEED_HIGH] = "high-speed",
171 	[USB_SPEED_SUPER] = "super-speed",
172 	[USB_SPEED_SUPER_PLUS] = "super-speed-plus",
185 	ret = of_property_read_string(dwc3_np, "maximum-speed", &maximum_speed);  in __get_dwc3_maximum_speed()
196 	struct device *dev = rtk->dev;  in dwc3_rtk_init()
209 		reg = rtk->regs + WRAP_CTR_REG;  in dwc3_rtk_init()
212 		dev_info(dev, "[bug fixed] 1295/1296 A00: add workaround to disable multiple request for D-Bus");  in dwc3_rtk_init()
216 		reg = rtk->regs + WRAP_USB2_PHY_REG;  in dwc3_rtk_init()
222 	reg = rtk->regs + WRAP_USB2_PHY_UTMI_REG;  in dwc3_rtk_init()
226 	maximum_speed = __get_dwc3_maximum_speed(dev->of_node);  in dwc3_rtk_init()
229 			reg = rtk->regs + WRAP_USB_HMAC_CTR0_REG;  in dwc3_rtk_init()
233 			reg = rtk->regs + WRAP_CTR_REG;  in dwc3_rtk_init()
237 			reg = rtk->regs + WRAP_PHY_PIPE_REG;  in dwc3_rtk_init()
241 			reg =  rtk->regs + WRAP_USB_HMAC_CTR0_REG;  in dwc3_rtk_init()
245 			reg = rtk->regs + WRAP_APHY_REG;  in dwc3_rtk_init()
249 			dev_dbg(rtk->dev, "%s: disable usb 3.0 phy\n", __func__);  in dwc3_rtk_init()
253 	reg = rtk->regs + WRAP_CTR_REG;  in dwc3_rtk_init()
257 	/* Set phy Dp/Dm initial state to host mode to avoid the Dp glitch */  in dwc3_rtk_init()
258 	reg = rtk->regs + WRAP_USB2_PHY_REG;  in dwc3_rtk_init()
262 	if (rtk->pm_base) {  in dwc3_rtk_init()
263 		reg = rtk->pm_base + USB_DBUS_PWR_CTRL_REG;  in dwc3_rtk_init()
273 	struct device *dev = rtk->dev;  in dwc3_rtk_probe_dwc3_core()
274 	struct device_node *node = dev->of_node;  in dwc3_rtk_probe_dwc3_core()
282 		return -EINVAL;  in dwc3_rtk_probe_dwc3_core()
294 		ret = -ENODEV;  in dwc3_rtk_probe_dwc3_core()
301 		ret = -ENODEV;  in dwc3_rtk_probe_dwc3_core()
305 	dwc3_dev = &dwc3_pdev->dev;  in dwc3_rtk_probe_dwc3_core()
306 	rtk->dwc = platform_get_drvdata(dwc3_pdev);  in dwc3_rtk_probe_dwc3_core()
307 	if (!rtk->dwc) {  in dwc3_rtk_probe_dwc3_core()
309 		ret = -ENODEV;  in dwc3_rtk_probe_dwc3_core()
314 	if (dr_mode != rtk->dwc->dr_mode) {  in dwc3_rtk_probe_dwc3_core()
316 			 dr_mode, rtk->dwc->dr_mode);  in dwc3_rtk_probe_dwc3_core()
317 		dr_mode = rtk->dwc->dr_mode;  in dwc3_rtk_probe_dwc3_core()
320 	switch (dr_mode) {  in dwc3_rtk_probe_dwc3_core()
322 		rtk->cur_role = USB_ROLE_DEVICE;  in dwc3_rtk_probe_dwc3_core()
325 		rtk->cur_role = USB_ROLE_HOST;  in dwc3_rtk_probe_dwc3_core()
327 	default:  in dwc3_rtk_probe_dwc3_core()
328 		dev_dbg(rtk->dev, "%s: dr_mode=%d\n", __func__, dr_mode);  in dwc3_rtk_probe_dwc3_core()
332 	if (device_property_read_bool(dwc3_dev, "usb-role-switch")) {  in dwc3_rtk_probe_dwc3_core()
338 		rtk->cur_role = dwc3_rtk_get_role(rtk);  in dwc3_rtk_probe_dwc3_core()
341 	switch_usb2_role(rtk, rtk->cur_role);  in dwc3_rtk_probe_dwc3_core()
358 	struct device *dev = &pdev->dev;  in dwc3_rtk_probe()
364 		return -ENOMEM;  in dwc3_rtk_probe()
368 	rtk->dev = dev;  in dwc3_rtk_probe()
374 	rtk->regs = regs;  in dwc3_rtk_probe()
375 	rtk->regs_size = resource_size(res);  in dwc3_rtk_probe()
379 		rtk->pm_base = devm_ioremap_resource(dev, res);  in dwc3_rtk_probe()
380 		if (IS_ERR(rtk->pm_base))  in dwc3_rtk_probe()
381 			return PTR_ERR(rtk->pm_base);  in dwc3_rtk_probe()
391 	rtk->dwc = NULL;  in dwc3_rtk_remove()
395 	of_platform_depopulate(rtk->dev);  in dwc3_rtk_remove()
402 	of_platform_depopulate(rtk->dev);  in dwc3_rtk_shutdown()
406 	{ .compatible = "realtek,rtd-dwc3" },
423 	switch_usb2_role(rtk, rtk->cur_role);  in dwc3_rtk_resume()
446 		.name	= "rtk-dwc3",
457 MODULE_ALIAS("platform:rtk-dwc3");