1 // SPDX-License-Identifier: GPL-2.0-only
3  * Meson8, Meson8b and GXBB USB2 PHY driver
16 #include <linux/phy/phy.h>
50 /* bits [31:26], [24:21] and [15:3] seem to be read-only */
140 static int phy_meson8b_usb2_power_on(struct phy *phy)  in phy_meson8b_usb2_power_on()  argument
142 	struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson8b_usb2_power_on()
146 	if (!IS_ERR_OR_NULL(priv->reset)) {  in phy_meson8b_usb2_power_on()
147 		ret = reset_control_reset(priv->reset);  in phy_meson8b_usb2_power_on()
149 			dev_err(&phy->dev, "Failed to trigger USB reset\n");  in phy_meson8b_usb2_power_on()
154 	ret = clk_prepare_enable(priv->clk_usb_general);  in phy_meson8b_usb2_power_on()
156 		dev_err(&phy->dev, "Failed to enable USB general clock\n");  in phy_meson8b_usb2_power_on()
157 		reset_control_rearm(priv->reset);  in phy_meson8b_usb2_power_on()
161 	ret = clk_prepare_enable(priv->clk_usb);  in phy_meson8b_usb2_power_on()
163 		dev_err(&phy->dev, "Failed to enable USB DDR clock\n");  in phy_meson8b_usb2_power_on()
164 		clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_on()
165 		reset_control_rearm(priv->reset);  in phy_meson8b_usb2_power_on()
169 	regmap_update_bits(priv->regmap, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,  in phy_meson8b_usb2_power_on()
172 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,  in phy_meson8b_usb2_power_on()
175 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,  in phy_meson8b_usb2_power_on()
178 	/* reset the PHY */  in phy_meson8b_usb2_power_on()
179 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,  in phy_meson8b_usb2_power_on()
182 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);  in phy_meson8b_usb2_power_on()
185 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,  in phy_meson8b_usb2_power_on()
188 	if (priv->dr_mode == USB_DR_MODE_HOST) {  in phy_meson8b_usb2_power_on()
189 		regmap_update_bits(priv->regmap, REG_DBG_UART,  in phy_meson8b_usb2_power_on()
192 		if (priv->match->host_enable_aca) {  in phy_meson8b_usb2_power_on()
193 			regmap_update_bits(priv->regmap, REG_ADP_BC,  in phy_meson8b_usb2_power_on()
199 			regmap_read(priv->regmap, REG_ADP_BC, &reg);  in phy_meson8b_usb2_power_on()
201 				dev_warn(&phy->dev, "USB ID detect failed!\n");  in phy_meson8b_usb2_power_on()
202 				clk_disable_unprepare(priv->clk_usb);  in phy_meson8b_usb2_power_on()
203 				clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_on()
204 				reset_control_rearm(priv->reset);  in phy_meson8b_usb2_power_on()
205 				return -EINVAL;  in phy_meson8b_usb2_power_on()
213 static int phy_meson8b_usb2_power_off(struct phy *phy)  in phy_meson8b_usb2_power_off()  argument
215 	struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);  in phy_meson8b_usb2_power_off()
217 	if (priv->dr_mode == USB_DR_MODE_HOST)  in phy_meson8b_usb2_power_off()
218 		regmap_update_bits(priv->regmap, REG_DBG_UART,  in phy_meson8b_usb2_power_off()
222 	clk_disable_unprepare(priv->clk_usb);  in phy_meson8b_usb2_power_off()
223 	clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_off()
224 	reset_control_rearm(priv->reset);  in phy_meson8b_usb2_power_off()
226 	/* power off the PHY by putting it into reset mode */  in phy_meson8b_usb2_power_off()
227 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,  in phy_meson8b_usb2_power_off()
242 	struct phy *phy;  in phy_meson8b_usb2_probe()  local
246 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in phy_meson8b_usb2_probe()
248 		return -ENOMEM;  in phy_meson8b_usb2_probe()
254 	priv->match = device_get_match_data(&pdev->dev);  in phy_meson8b_usb2_probe()
255 	if (!priv->match)  in phy_meson8b_usb2_probe()
256 		return -ENODEV;  in phy_meson8b_usb2_probe()
258 	priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,  in phy_meson8b_usb2_probe()
260 	if (IS_ERR(priv->regmap))  in phy_meson8b_usb2_probe()
261 		return PTR_ERR(priv->regmap);  in phy_meson8b_usb2_probe()
263 	priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");  in phy_meson8b_usb2_probe()
264 	if (IS_ERR(priv->clk_usb_general))  in phy_meson8b_usb2_probe()
265 		return PTR_ERR(priv->clk_usb_general);  in phy_meson8b_usb2_probe()
267 	priv->clk_usb = devm_clk_get(&pdev->dev, "usb");  in phy_meson8b_usb2_probe()
268 	if (IS_ERR(priv->clk_usb))  in phy_meson8b_usb2_probe()
269 		return PTR_ERR(priv->clk_usb);  in phy_meson8b_usb2_probe()
271 	priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);  in phy_meson8b_usb2_probe()
272 	if (IS_ERR(priv->reset))  in phy_meson8b_usb2_probe()
273 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->reset),  in phy_meson8b_usb2_probe()
276 	priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);  in phy_meson8b_usb2_probe()
277 	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {  in phy_meson8b_usb2_probe()
278 		dev_err(&pdev->dev,  in phy_meson8b_usb2_probe()
280 		return -EINVAL;  in phy_meson8b_usb2_probe()
283 	phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);  in phy_meson8b_usb2_probe()
284 	if (IS_ERR(phy)) {  in phy_meson8b_usb2_probe()
285 		return dev_err_probe(&pdev->dev, PTR_ERR(phy),  in phy_meson8b_usb2_probe()
286 				     "failed to create PHY\n");  in phy_meson8b_usb2_probe()
289 	phy_set_drvdata(phy, priv);  in phy_meson8b_usb2_probe()
292 		devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);  in phy_meson8b_usb2_probe()
307 		.compatible = "amlogic,meson8-usb2-phy",
311 		.compatible = "amlogic,meson8b-usb2-phy",
315 		.compatible = "amlogic,meson8m2-usb2-phy",
319 		.compatible = "amlogic,meson-gxbb-usb2-phy",
329 		.name		= "phy-meson-usb2",
336 MODULE_DESCRIPTION("Meson8, Meson8b, Meson8m2 and GXBB USB2 PHY driver");