1 // SPDX-License-Identifier: GPL-2.0
3  * Renesas R-Car Gen2 PHY driver
15 #include <linux/phy/phy.h>
28 /* USB General control register (UGCTRL) */
32 /* USB General control register 2 (UGCTRL2) */
42 /* USB General status register (UGSTS) */
48 	struct phy *phy;  member
76 static int rcar_gen2_phy_init(struct phy *p)  in rcar_gen2_phy_init()
78 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rcar_gen2_phy_init()  local
79 	struct rcar_gen2_channel *channel = phy->channel;  in rcar_gen2_phy_init()
80 	struct rcar_gen2_phy_driver *drv = channel->drv;  in rcar_gen2_phy_init()
85 	 * Try to acquire exclusive access to PHY.  The first driver calling  in rcar_gen2_phy_init()
87 	 * PHY on this channel will fail until phy_exit() is called by the first  in rcar_gen2_phy_init()
88 	 * driver.   Achieving this with cmpxcgh() should be SMP-safe.  in rcar_gen2_phy_init()
90 	if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1)  in rcar_gen2_phy_init()
91 		return -EBUSY;  in rcar_gen2_phy_init()
93 	clk_prepare_enable(drv->clk);  in rcar_gen2_phy_init()
95 	spin_lock_irqsave(&drv->lock, flags);  in rcar_gen2_phy_init()
96 	ugctrl2 = readl(drv->base + USBHS_UGCTRL2);  in rcar_gen2_phy_init()
97 	ugctrl2 &= ~channel->select_mask;  in rcar_gen2_phy_init()
98 	ugctrl2 |= phy->select_value;  in rcar_gen2_phy_init()
99 	writel(ugctrl2, drv->base + USBHS_UGCTRL2);  in rcar_gen2_phy_init()
100 	spin_unlock_irqrestore(&drv->lock, flags);  in rcar_gen2_phy_init()
104 static int rcar_gen2_phy_exit(struct phy *p)  in rcar_gen2_phy_exit()
106 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rcar_gen2_phy_exit()  local
107 	struct rcar_gen2_channel *channel = phy->channel;  in rcar_gen2_phy_exit()
109 	clk_disable_unprepare(channel->drv->clk);  in rcar_gen2_phy_exit()
111 	channel->selected_phy = -1;  in rcar_gen2_phy_exit()
116 static int rcar_gen2_phy_power_on(struct phy *p)  in rcar_gen2_phy_power_on()
118 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rcar_gen2_phy_power_on()  local
119 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;  in rcar_gen2_phy_power_on()
120 	void __iomem *base = drv->base;  in rcar_gen2_phy_power_on()
126 	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)  in rcar_gen2_phy_power_on()
129 	spin_lock_irqsave(&drv->lock, flags);  in rcar_gen2_phy_power_on()
131 	/* Power on USBHS PHY */  in rcar_gen2_phy_power_on()
152 	err = -ETIMEDOUT;  in rcar_gen2_phy_power_on()
155 	spin_unlock_irqrestore(&drv->lock, flags);  in rcar_gen2_phy_power_on()
160 static int rcar_gen2_phy_power_off(struct phy *p)  in rcar_gen2_phy_power_off()
162 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rcar_gen2_phy_power_off()  local
163 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;  in rcar_gen2_phy_power_off()
164 	void __iomem *base = drv->base;  in rcar_gen2_phy_power_off()
169 	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)  in rcar_gen2_phy_power_off()
172 	spin_lock_irqsave(&drv->lock, flags);  in rcar_gen2_phy_power_off()
174 	/* Power off USBHS PHY */  in rcar_gen2_phy_power_off()
187 	spin_unlock_irqrestore(&drv->lock, flags);  in rcar_gen2_phy_power_off()
192 static int rz_g1c_phy_power_on(struct phy *p)  in rz_g1c_phy_power_on()
194 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rz_g1c_phy_power_on()  local
195 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;  in rz_g1c_phy_power_on()
196 	void __iomem *base = drv->base;  in rz_g1c_phy_power_on()
200 	spin_lock_irqsave(&drv->lock, flags);  in rz_g1c_phy_power_on()
202 	/* Power on USBHS PHY */  in rz_g1c_phy_power_on()
210 	if (phy->select_value == USBHS_UGCTRL2_USB0SEL_HS_USB20) {  in rz_g1c_phy_power_on()
216 	spin_unlock_irqrestore(&drv->lock, flags);  in rz_g1c_phy_power_on()
221 static int rz_g1c_phy_power_off(struct phy *p)  in rz_g1c_phy_power_off()
223 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);  in rz_g1c_phy_power_off()  local
224 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;  in rz_g1c_phy_power_off()
225 	void __iomem *base = drv->base;  in rz_g1c_phy_power_off()
229 	spin_lock_irqsave(&drv->lock, flags);  in rz_g1c_phy_power_off()
230 	/* Power off USBHS PHY */  in rz_g1c_phy_power_off()
231 	if (phy->select_value == USBHS_UGCTRL2_USB0SEL_HS_USB20) {  in rz_g1c_phy_power_off()
241 	spin_unlock_irqrestore(&drv->lock, flags);  in rz_g1c_phy_power_off()
285 		.compatible = "renesas,usb-phy-r8a77470",
289 		.compatible = "renesas,usb-phy-r8a7790",
293 		.compatible = "renesas,usb-phy-r8a7791",
297 		.compatible = "renesas,usb-phy-r8a7794",
301 		.compatible = "renesas,rcar-gen2-usb-phy",
308 static struct phy *rcar_gen2_phy_xlate(struct device *dev,  in rcar_gen2_phy_xlate()
312 	struct device_node *np = args->np;  in rcar_gen2_phy_xlate()
317 		return ERR_PTR(-EINVAL);  in rcar_gen2_phy_xlate()
319 	for (i = 0; i < drv->num_channels; i++) {  in rcar_gen2_phy_xlate()
320 		if (np == drv->channels[i].of_node)  in rcar_gen2_phy_xlate()
324 	if (i >= drv->num_channels || args->args[0] >= 2)  in rcar_gen2_phy_xlate()
325 		return ERR_PTR(-ENODEV);  in rcar_gen2_phy_xlate()
327 	return drv->channels[i].phys[args->args[0]].phy;  in rcar_gen2_phy_xlate()
337 	struct device *dev = &pdev->dev;  in rcar_gen2_phy_probe()
346 	if (!dev->of_node) {  in rcar_gen2_phy_probe()
349 		return -EINVAL;  in rcar_gen2_phy_probe()
364 		return -ENOMEM;  in rcar_gen2_phy_probe()
366 	spin_lock_init(&drv->lock);  in rcar_gen2_phy_probe()
368 	drv->clk = clk;  in rcar_gen2_phy_probe()
369 	drv->base = base;  in rcar_gen2_phy_probe()
373 		return -EINVAL;  in rcar_gen2_phy_probe()
375 	drv->num_channels = of_get_child_count(dev->of_node);  in rcar_gen2_phy_probe()
376 	drv->channels = devm_kcalloc(dev, drv->num_channels,  in rcar_gen2_phy_probe()
379 	if (!drv->channels)  in rcar_gen2_phy_probe()
380 		return -ENOMEM;  in rcar_gen2_phy_probe()
382 	for_each_child_of_node(dev->of_node, np) {  in rcar_gen2_phy_probe()
383 		struct rcar_gen2_channel *channel = drv->channels + i;  in rcar_gen2_phy_probe()
387 		channel->of_node = np;  in rcar_gen2_phy_probe()
388 		channel->drv = drv;  in rcar_gen2_phy_probe()
389 		channel->selected_phy = -1;  in rcar_gen2_phy_probe()
392 		if (error || channel_num >= data->num_channels) {  in rcar_gen2_phy_probe()
397 		channel->select_mask = select_mask[channel_num];  in rcar_gen2_phy_probe()
400 			struct rcar_gen2_phy *phy = &channel->phys[n];  in rcar_gen2_phy_probe()  local
402 			phy->channel = channel;  in rcar_gen2_phy_probe()
403 			phy->number = n;  in rcar_gen2_phy_probe()
404 			phy->select_value = data->select_value[channel_num][n];  in rcar_gen2_phy_probe()
406 			phy->phy = devm_phy_create(dev, NULL,  in rcar_gen2_phy_probe()
407 						   data->gen2_phy_ops);  in rcar_gen2_phy_probe()
408 			if (IS_ERR(phy->phy)) {  in rcar_gen2_phy_probe()
409 				dev_err(dev, "Failed to create PHY\n");  in rcar_gen2_phy_probe()
411 				return PTR_ERR(phy->phy);  in rcar_gen2_phy_probe()
413 			phy_set_drvdata(phy->phy, phy);  in rcar_gen2_phy_probe()
421 		dev_err(dev, "Failed to register PHY provider\n");  in rcar_gen2_phy_probe()
441 MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY");