1 // SPDX-License-Identifier: GPL-2.0-only
3  * Meson8, Meson8b and GXBB USB2 PHY driver
15 #include <linux/reset.h>
50 /* bits [31:26], [24:21] and [15:3] seem to be read-only */
129 	struct reset_control				*reset;  member
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()
160 	ret = clk_prepare_enable(priv->clk_usb);  in phy_meson8b_usb2_power_on()
162 		dev_err(&phy->dev, "Failed to enable USB DDR clock\n");  in phy_meson8b_usb2_power_on()
163 		clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_on()
167 	regmap_update_bits(priv->regmap, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,  in phy_meson8b_usb2_power_on()
170 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,  in phy_meson8b_usb2_power_on()
173 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,  in phy_meson8b_usb2_power_on()
176 	/* reset the PHY */  in phy_meson8b_usb2_power_on()
177 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,  in phy_meson8b_usb2_power_on()
180 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);  in phy_meson8b_usb2_power_on()
183 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,  in phy_meson8b_usb2_power_on()
186 	if (priv->dr_mode == USB_DR_MODE_HOST) {  in phy_meson8b_usb2_power_on()
187 		regmap_update_bits(priv->regmap, REG_DBG_UART,  in phy_meson8b_usb2_power_on()
190 		if (priv->match->host_enable_aca) {  in phy_meson8b_usb2_power_on()
191 			regmap_update_bits(priv->regmap, REG_ADP_BC,  in phy_meson8b_usb2_power_on()
197 			regmap_read(priv->regmap, REG_ADP_BC, &reg);  in phy_meson8b_usb2_power_on()
199 				dev_warn(&phy->dev, "USB ID detect failed!\n");  in phy_meson8b_usb2_power_on()
200 				clk_disable_unprepare(priv->clk_usb);  in phy_meson8b_usb2_power_on()
201 				clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_on()
202 				return -EINVAL;  in phy_meson8b_usb2_power_on()
214 	if (priv->dr_mode == USB_DR_MODE_HOST)  in phy_meson8b_usb2_power_off()
215 		regmap_update_bits(priv->regmap, REG_DBG_UART,  in phy_meson8b_usb2_power_off()
219 	clk_disable_unprepare(priv->clk_usb);  in phy_meson8b_usb2_power_off()
220 	clk_disable_unprepare(priv->clk_usb_general);  in phy_meson8b_usb2_power_off()
238 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in phy_meson8b_usb2_probe()
240 		return -ENOMEM;  in phy_meson8b_usb2_probe()
246 	priv->match = device_get_match_data(&pdev->dev);  in phy_meson8b_usb2_probe()
247 	if (!priv->match)  in phy_meson8b_usb2_probe()
248 		return -ENODEV;  in phy_meson8b_usb2_probe()
250 	priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,  in phy_meson8b_usb2_probe()
252 	if (IS_ERR(priv->regmap))  in phy_meson8b_usb2_probe()
253 		return PTR_ERR(priv->regmap);  in phy_meson8b_usb2_probe()
255 	priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");  in phy_meson8b_usb2_probe()
256 	if (IS_ERR(priv->clk_usb_general))  in phy_meson8b_usb2_probe()
257 		return PTR_ERR(priv->clk_usb_general);  in phy_meson8b_usb2_probe()
259 	priv->clk_usb = devm_clk_get(&pdev->dev, "usb");  in phy_meson8b_usb2_probe()
260 	if (IS_ERR(priv->clk_usb))  in phy_meson8b_usb2_probe()
261 		return PTR_ERR(priv->clk_usb);  in phy_meson8b_usb2_probe()
263 	priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);  in phy_meson8b_usb2_probe()
264 	if (PTR_ERR(priv->reset) == -EPROBE_DEFER)  in phy_meson8b_usb2_probe()
265 		return PTR_ERR(priv->reset);  in phy_meson8b_usb2_probe()
267 	priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);  in phy_meson8b_usb2_probe()
268 	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {  in phy_meson8b_usb2_probe()
269 		dev_err(&pdev->dev,  in phy_meson8b_usb2_probe()
271 		return -EINVAL;  in phy_meson8b_usb2_probe()
274 	phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);  in phy_meson8b_usb2_probe()
276 		dev_err(&pdev->dev, "failed to create PHY\n");  in phy_meson8b_usb2_probe()
283 		devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);  in phy_meson8b_usb2_probe()
298 		.compatible = "amlogic,meson8-usb2-phy",
302 		.compatible = "amlogic,meson8b-usb2-phy",
306 		.compatible = "amlogic,meson8m2-usb2-phy",
310 		.compatible = "amlogic,meson-gxbb-usb2-phy",
320 		.name		= "phy-meson-usb2",
327 MODULE_DESCRIPTION("Meson8, Meson8b, Meson8m2 and GXBB USB2 PHY driver");