1 // SPDX-License-Identifier: GPL-2.0-only
3  * Meson GXL and GXM USB2 PHY driver
15 #include <linux/phy/phy.h>
18 /* bits [31:27] are read-only */
66 /* bits [31:14] are read-only */
94 	enum phy_mode		mode;  member
107 static int phy_meson_gxl_usb2_init(struct phy *phy)  in phy_meson_gxl_usb2_init()  argument
109 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_init()
112 	ret = reset_control_reset(priv->reset);  in phy_meson_gxl_usb2_init()
116 	ret = clk_prepare_enable(priv->clk);  in phy_meson_gxl_usb2_init()
123 static int phy_meson_gxl_usb2_exit(struct phy *phy)  in phy_meson_gxl_usb2_exit()  argument
125 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_exit()
127 	clk_disable_unprepare(priv->clk);  in phy_meson_gxl_usb2_exit()
132 static int phy_meson_gxl_usb2_reset(struct phy *phy)  in phy_meson_gxl_usb2_reset()  argument
134 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_reset()
136 	if (priv->is_enabled) {  in phy_meson_gxl_usb2_reset()
137 		/* reset the PHY and wait until settings are stabilized */  in phy_meson_gxl_usb2_reset()
138 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_reset()
141 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_reset()
149 static int phy_meson_gxl_usb2_set_mode(struct phy *phy,  in phy_meson_gxl_usb2_set_mode()  argument
150 				       enum phy_mode mode, int submode)  in phy_meson_gxl_usb2_set_mode()  argument
152 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_set_mode()
154 	switch (mode) {  in phy_meson_gxl_usb2_set_mode()
157 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
159 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
161 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0);  in phy_meson_gxl_usb2_set_mode()
165 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
167 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
169 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,  in phy_meson_gxl_usb2_set_mode()
174 		return -EINVAL;  in phy_meson_gxl_usb2_set_mode()
177 	phy_meson_gxl_usb2_reset(phy);  in phy_meson_gxl_usb2_set_mode()
179 	priv->mode = mode;  in phy_meson_gxl_usb2_set_mode()
184 static int phy_meson_gxl_usb2_power_off(struct phy *phy)  in phy_meson_gxl_usb2_power_off()  argument
186 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_off()
188 	priv->is_enabled = 0;  in phy_meson_gxl_usb2_power_off()
190 	/* power off the PHY by putting it into reset mode */  in phy_meson_gxl_usb2_power_off()
191 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_power_off()
197 static int phy_meson_gxl_usb2_power_on(struct phy *phy)  in phy_meson_gxl_usb2_power_on()  argument
199 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_on()
202 	priv->is_enabled = 1;  in phy_meson_gxl_usb2_power_on()
204 	/* power on the PHY by taking it out of reset mode */  in phy_meson_gxl_usb2_power_on()
205 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);  in phy_meson_gxl_usb2_power_on()
207 	ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode, 0);  in phy_meson_gxl_usb2_power_on()
209 		phy_meson_gxl_usb2_power_off(phy);  in phy_meson_gxl_usb2_power_on()
211 		dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",  in phy_meson_gxl_usb2_power_on()
212 			priv->mode);  in phy_meson_gxl_usb2_power_on()
231 	struct device *dev = &pdev->dev;  in phy_meson_gxl_usb2_probe()
235 	struct phy *phy;  in phy_meson_gxl_usb2_probe()  local
241 		return -ENOMEM;  in phy_meson_gxl_usb2_probe()
250 	/* start in host mode */  in phy_meson_gxl_usb2_probe()
251 	priv->mode = PHY_MODE_USB_HOST;  in phy_meson_gxl_usb2_probe()
253 	priv->regmap = devm_regmap_init_mmio(dev, base,  in phy_meson_gxl_usb2_probe()
255 	if (IS_ERR(priv->regmap))  in phy_meson_gxl_usb2_probe()
256 		return PTR_ERR(priv->regmap);  in phy_meson_gxl_usb2_probe()
258 	priv->clk = devm_clk_get_optional(dev, "phy");  in phy_meson_gxl_usb2_probe()
259 	if (IS_ERR(priv->clk))  in phy_meson_gxl_usb2_probe()
260 		return PTR_ERR(priv->clk);  in phy_meson_gxl_usb2_probe()
262 	priv->reset = devm_reset_control_get_optional_shared(dev, "phy");  in phy_meson_gxl_usb2_probe()
263 	if (IS_ERR(priv->reset))  in phy_meson_gxl_usb2_probe()
264 		return PTR_ERR(priv->reset);  in phy_meson_gxl_usb2_probe()
266 	phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops);  in phy_meson_gxl_usb2_probe()
267 	if (IS_ERR(phy)) {  in phy_meson_gxl_usb2_probe()
268 		ret = PTR_ERR(phy);  in phy_meson_gxl_usb2_probe()
269 		if (ret != -EPROBE_DEFER)  in phy_meson_gxl_usb2_probe()
270 			dev_err(dev, "failed to create PHY\n");  in phy_meson_gxl_usb2_probe()
275 	phy_set_drvdata(phy, priv);  in phy_meson_gxl_usb2_probe()
283 	{ .compatible = "amlogic,meson-gxl-usb2-phy", },
291 		.name		= "phy-meson-gxl-usb2",
298 MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");