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()
118 		reset_control_rearm(priv->reset);  in phy_meson_gxl_usb2_init()
125 static int phy_meson_gxl_usb2_exit(struct phy *phy)  in phy_meson_gxl_usb2_exit()  argument
127 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_exit()
129 	clk_disable_unprepare(priv->clk);  in phy_meson_gxl_usb2_exit()
130 	reset_control_rearm(priv->reset);  in phy_meson_gxl_usb2_exit()
135 static int phy_meson_gxl_usb2_reset(struct phy *phy)  in phy_meson_gxl_usb2_reset()  argument
137 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_reset()
139 	if (priv->is_enabled) {  in phy_meson_gxl_usb2_reset()
140 		/* reset the PHY and wait until settings are stabilized */  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()
144 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_reset()
152 static int phy_meson_gxl_usb2_set_mode(struct phy *phy,  in phy_meson_gxl_usb2_set_mode()  argument
153 				       enum phy_mode mode, int submode)  in phy_meson_gxl_usb2_set_mode()  argument
155 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_set_mode()
157 	switch (mode) {  in phy_meson_gxl_usb2_set_mode()
160 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
162 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
164 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,  in phy_meson_gxl_usb2_set_mode()
169 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
171 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
173 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,  in phy_meson_gxl_usb2_set_mode()
178 		return -EINVAL;  in phy_meson_gxl_usb2_set_mode()
181 	phy_meson_gxl_usb2_reset(phy);  in phy_meson_gxl_usb2_set_mode()
183 	priv->mode = mode;  in phy_meson_gxl_usb2_set_mode()
188 static int phy_meson_gxl_usb2_power_off(struct phy *phy)  in phy_meson_gxl_usb2_power_off()  argument
190 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_off()
192 	priv->is_enabled = 0;  in phy_meson_gxl_usb2_power_off()
194 	/* power off the PHY by putting it into reset mode */  in phy_meson_gxl_usb2_power_off()
195 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_power_off()
201 static int phy_meson_gxl_usb2_power_on(struct phy *phy)  in phy_meson_gxl_usb2_power_on()  argument
203 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_on()
206 	priv->is_enabled = 1;  in phy_meson_gxl_usb2_power_on()
208 	/* power on the PHY by taking it out of reset mode */  in phy_meson_gxl_usb2_power_on()
209 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);  in phy_meson_gxl_usb2_power_on()
211 	ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode, 0);  in phy_meson_gxl_usb2_power_on()
213 		phy_meson_gxl_usb2_power_off(phy);  in phy_meson_gxl_usb2_power_on()
215 		dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",  in phy_meson_gxl_usb2_power_on()
216 			priv->mode);  in phy_meson_gxl_usb2_power_on()
235 	struct device *dev = &pdev->dev;  in phy_meson_gxl_usb2_probe()
238 	struct phy *phy;  in phy_meson_gxl_usb2_probe()  local
244 		return -ENOMEM;  in phy_meson_gxl_usb2_probe()
252 	/* start in host mode */  in phy_meson_gxl_usb2_probe()
253 	priv->mode = PHY_MODE_USB_HOST;  in phy_meson_gxl_usb2_probe()
255 	priv->regmap = devm_regmap_init_mmio(dev, base,  in phy_meson_gxl_usb2_probe()
257 	if (IS_ERR(priv->regmap))  in phy_meson_gxl_usb2_probe()
258 		return PTR_ERR(priv->regmap);  in phy_meson_gxl_usb2_probe()
260 	priv->clk = devm_clk_get_optional(dev, "phy");  in phy_meson_gxl_usb2_probe()
261 	if (IS_ERR(priv->clk))  in phy_meson_gxl_usb2_probe()
262 		return PTR_ERR(priv->clk);  in phy_meson_gxl_usb2_probe()
264 	priv->reset = devm_reset_control_get_optional_shared(dev, "phy");  in phy_meson_gxl_usb2_probe()
265 	if (IS_ERR(priv->reset))  in phy_meson_gxl_usb2_probe()
266 		return PTR_ERR(priv->reset);  in phy_meson_gxl_usb2_probe()
268 	phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops);  in phy_meson_gxl_usb2_probe()
269 	if (IS_ERR(phy)) {  in phy_meson_gxl_usb2_probe()
270 		ret = PTR_ERR(phy);  in phy_meson_gxl_usb2_probe()
271 		if (ret != -EPROBE_DEFER)  in phy_meson_gxl_usb2_probe()
272 			dev_err(dev, "failed to create PHY\n");  in phy_meson_gxl_usb2_probe()
277 	phy_set_drvdata(phy, priv);  in phy_meson_gxl_usb2_probe()
285 	{ .compatible = "amlogic,meson-gxl-usb2-phy", },
293 		.name		= "phy-meson-gxl-usb2",
300 MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");