2  * Meson GXL and GXM USB2 PHY driver
21 #include <linux/phy/phy.h>
24 /* bits [31:27] are read-only */
72 /* bits [31:14] are read-only */
100 	enum phy_mode		mode;  member
113 static int phy_meson_gxl_usb2_init(struct phy *phy)  in phy_meson_gxl_usb2_init()  argument
115 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_init()
118 	ret = reset_control_reset(priv->reset);  in phy_meson_gxl_usb2_init()
122 	ret = clk_prepare_enable(priv->clk);  in phy_meson_gxl_usb2_init()
129 static int phy_meson_gxl_usb2_exit(struct phy *phy)  in phy_meson_gxl_usb2_exit()  argument
131 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_exit()
133 	clk_disable_unprepare(priv->clk);  in phy_meson_gxl_usb2_exit()
138 static int phy_meson_gxl_usb2_reset(struct phy *phy)  in phy_meson_gxl_usb2_reset()  argument
140 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_reset()
142 	if (priv->is_enabled) {  in phy_meson_gxl_usb2_reset()
143 		/* reset the PHY and wait until settings are stabilized */  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()
147 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_reset()
155 static int phy_meson_gxl_usb2_set_mode(struct phy *phy, enum phy_mode mode)  in phy_meson_gxl_usb2_set_mode()  argument
157 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_set_mode()
159 	switch (mode) {  in phy_meson_gxl_usb2_set_mode()
162 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
164 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
166 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0);  in phy_meson_gxl_usb2_set_mode()
170 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
172 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,  in phy_meson_gxl_usb2_set_mode()
174 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,  in phy_meson_gxl_usb2_set_mode()
179 		return -EINVAL;  in phy_meson_gxl_usb2_set_mode()
182 	phy_meson_gxl_usb2_reset(phy);  in phy_meson_gxl_usb2_set_mode()
184 	priv->mode = mode;  in phy_meson_gxl_usb2_set_mode()
189 static int phy_meson_gxl_usb2_power_off(struct phy *phy)  in phy_meson_gxl_usb2_power_off()  argument
191 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_off()
193 	priv->is_enabled = 0;  in phy_meson_gxl_usb2_power_off()
195 	/* power off the PHY by putting it into reset mode */  in phy_meson_gxl_usb2_power_off()
196 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,  in phy_meson_gxl_usb2_power_off()
202 static int phy_meson_gxl_usb2_power_on(struct phy *phy)  in phy_meson_gxl_usb2_power_on()  argument
204 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson_gxl_usb2_power_on()
207 	priv->is_enabled = 1;  in phy_meson_gxl_usb2_power_on()
209 	/* power on the PHY by taking it out of reset mode */  in phy_meson_gxl_usb2_power_on()
210 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);  in phy_meson_gxl_usb2_power_on()
212 	ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode);  in phy_meson_gxl_usb2_power_on()
214 		phy_meson_gxl_usb2_power_off(phy);  in phy_meson_gxl_usb2_power_on()
216 		dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",  in phy_meson_gxl_usb2_power_on()
217 			priv->mode);  in phy_meson_gxl_usb2_power_on()
236 	struct device *dev = &pdev->dev;  in phy_meson_gxl_usb2_probe()
240 	struct phy *phy;  in phy_meson_gxl_usb2_probe()  local
246 		return -ENOMEM;  in phy_meson_gxl_usb2_probe()
255 	/* start in host mode */  in phy_meson_gxl_usb2_probe()
256 	priv->mode = PHY_MODE_USB_HOST;  in phy_meson_gxl_usb2_probe()
258 	priv->regmap = devm_regmap_init_mmio(dev, base,  in phy_meson_gxl_usb2_probe()
260 	if (IS_ERR(priv->regmap))  in phy_meson_gxl_usb2_probe()
261 		return PTR_ERR(priv->regmap);  in phy_meson_gxl_usb2_probe()
263 	priv->clk = devm_clk_get(dev, "phy");  in phy_meson_gxl_usb2_probe()
264 	if (IS_ERR(priv->clk)) {  in phy_meson_gxl_usb2_probe()
265 		ret = PTR_ERR(priv->clk);  in phy_meson_gxl_usb2_probe()
266 		if (ret == -ENOENT)  in phy_meson_gxl_usb2_probe()
267 			priv->clk = NULL;  in phy_meson_gxl_usb2_probe()
272 	priv->reset = devm_reset_control_get_optional_shared(dev, "phy");  in phy_meson_gxl_usb2_probe()
273 	if (IS_ERR(priv->reset))  in phy_meson_gxl_usb2_probe()
274 		return PTR_ERR(priv->reset);  in phy_meson_gxl_usb2_probe()
276 	phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops);  in phy_meson_gxl_usb2_probe()
277 	if (IS_ERR(phy)) {  in phy_meson_gxl_usb2_probe()
278 		ret = PTR_ERR(phy);  in phy_meson_gxl_usb2_probe()
279 		if (ret != -EPROBE_DEFER)  in phy_meson_gxl_usb2_probe()
280 			dev_err(dev, "failed to create PHY\n");  in phy_meson_gxl_usb2_probe()
285 	phy_set_drvdata(phy, priv);  in phy_meson_gxl_usb2_probe()
293 	{ .compatible = "amlogic,meson-gxl-usb2-phy", },
301 		.name		= "phy-meson-gxl-usb2",
308 MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");