1 // SPDX-License-Identifier: GPL-2.0
3  * Intel LGM USB PHY driver
16 #include <linux/usb/phy.h>
37 static const char *const PHY_RESETS[] = { "phy31", "phy", };
44 	struct usb_phy phy;  member
56 	ret = extcon_get_property(ta->phy.edev, EXTCON_USB_HOST,  in get_flipped()
59 		dev_err(ta->phy.dev, "no polarity property from extcon\n");  in get_flipped()
68 static int phy_init(struct usb_phy *phy)  in phy_init()  argument
70 	struct tca_apb *ta = container_of(phy, struct tca_apb, phy);  in phy_init()
71 	void __iomem *ctrl1 = phy->io_priv + CTRL1_OFFSET;  in phy_init()
74 	if (ta->phy_initialized)  in phy_init()
78 		reset_control_deassert(ta->resets[i]);  in phy_init()
82 		dev_err(ta->phy.dev, "SRAM init failed, 0x%x\n", val);  in phy_init()
88 	ta->phy_initialized = true;  in phy_init()
89 	if (!ta->phy.edev) {  in phy_init()
90 		writel(TCPC_CONN, ta->phy.io_priv + TCPC_OFFSET);  in phy_init()
91 		return phy->set_vbus(phy, true);  in phy_init()
94 	schedule_work(&ta->wk);  in phy_init()
99 static void phy_shutdown(struct usb_phy *phy)  in phy_shutdown()  argument
101 	struct tca_apb *ta = container_of(phy, struct tca_apb, phy);  in phy_shutdown()
104 	if (!ta->phy_initialized)  in phy_shutdown()
107 	ta->phy_initialized = false;  in phy_shutdown()
108 	flush_work(&ta->wk);  in phy_shutdown()
109 	ta->phy.set_vbus(&ta->phy, false);  in phy_shutdown()
111 	ta->connected = false;  in phy_shutdown()
112 	writel(TCPC_DISCONN, ta->phy.io_priv + TCPC_OFFSET);  in phy_shutdown()
115 		reset_control_assert(ta->resets[i]);  in phy_shutdown()
118 static int phy_set_vbus(struct usb_phy *phy, int on)  in phy_set_vbus()  argument
120 	struct tca_apb *ta = container_of(phy, struct tca_apb, phy);  in phy_set_vbus()
123 	if (!!on == ta->regulator_enabled)  in phy_set_vbus()
127 		ret = regulator_enable(ta->vbus);  in phy_set_vbus()
129 		ret = regulator_disable(ta->vbus);  in phy_set_vbus()
132 		ta->regulator_enabled = on;  in phy_set_vbus()
134 	dev_dbg(ta->phy.dev, "set vbus: %d\n", on);  in phy_set_vbus()
150 	connected = extcon_get_state(ta->phy.edev, EXTCON_USB_HOST);  in tca_work()
151 	if (connected == ta->connected)  in tca_work()
154 	ta->connected = connected;  in tca_work()
159 		dev_dbg(ta->phy.dev, "connected%s\n", flipped ? " flipped" : "");  in tca_work()
162 		dev_dbg(ta->phy.dev, "disconnected\n");  in tca_work()
165 	writel(val, ta->phy.io_priv + TCPC_OFFSET);  in tca_work()
167 	ret = ta->phy.set_vbus(&ta->phy, connected);  in tca_work()
169 		dev_err(ta->phy.dev, "failed to set VBUS\n");  in tca_work()
174 	struct tca_apb *ta = container_of(nb, struct tca_apb, phy.id_nb);  in id_notifier()
176 	if (ta->phy_initialized)  in id_notifier()
177 		schedule_work(&ta->wk);  in id_notifier()
190 	struct device *dev = &pdev->dev;  in phy_probe()
191 	struct usb_phy *phy;  in phy_probe()  local
197 		return -ENOMEM;  in phy_probe()
200 	INIT_WORK(&ta->wk, tca_work);  in phy_probe()
202 	phy = &ta->phy;  in phy_probe()
203 	phy->dev = dev;  in phy_probe()
204 	phy->label = dev_name(dev);  in phy_probe()
205 	phy->type = USB_PHY_TYPE_USB3;  in phy_probe()
206 	phy->init = phy_init;  in phy_probe()
207 	phy->shutdown = phy_shutdown;  in phy_probe()
208 	phy->set_vbus = phy_set_vbus;  in phy_probe()
209 	phy->id_nb.notifier_call = id_notifier;  in phy_probe()
210 	phy->vbus_nb.notifier_call = vbus_notifier;  in phy_probe()
212 	phy->io_priv = devm_platform_ioremap_resource(pdev, 0);  in phy_probe()
213 	if (IS_ERR(phy->io_priv))  in phy_probe()
214 		return PTR_ERR(phy->io_priv);  in phy_probe()
216 	ta->vbus = devm_regulator_get(dev, "vbus");  in phy_probe()
217 	if (IS_ERR(ta->vbus))  in phy_probe()
218 		return PTR_ERR(ta->vbus);  in phy_probe()
229 		ta->resets[i] = devm_reset_control_get_exclusive(dev, PHY_RESETS[i]);  in phy_probe()
230 		if (IS_ERR(ta->resets[i])) {  in phy_probe()
232 			return PTR_ERR(ta->resets[i]);  in phy_probe()
240 		reset_control_assert(ta->resets[i]);  in phy_probe()
242 	 * Out-of-band reset of the controller after PHY reset will cause  in phy_probe()
243 	 * controller malfunctioning, so we should use in-band controller  in phy_probe()
244 	 * reset only and leave the controller de-asserted here.  in phy_probe()
249 	/* Need to wait at least 20us after de-assert the controller */  in phy_probe()
252 	return usb_add_phy_dev(phy);  in phy_probe()
259 	usb_remove_phy(&ta->phy);  in phy_remove()
263 	{ .compatible = "intel,lgm-usb-phy" },
270 		.name = "lgm-usb-phy",
279 MODULE_DESCRIPTION("Intel LGM USB PHY driver");