1 // SPDX-License-Identifier: GPL-2.0+
3  * Allwinner sun50i(H6) USB 3.0 phy driver
7  * Based on phy-sun9i-usb.c, which is:
9  * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
13  * Copyright (c) 2010-2015 Allwinner Technology Co., Ltd.
21 #include <linux/phy/phy.h>
38 /* PHY External Control Register */
43 /* PHY Tune High Register */
56 	struct phy *phy;  member
62 static void sun50i_usb3_phy_open(struct sun50i_usb3_phy *phy)  in sun50i_usb3_phy_open()  argument
66 	val = readl(phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);  in sun50i_usb3_phy_open()
69 	writel(val, phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);  in sun50i_usb3_phy_open()
71 	val = readl(phy->regs + SUNXI_PIPE_CLOCK_CONTROL);  in sun50i_usb3_phy_open()
73 	writel(val, phy->regs + SUNXI_PIPE_CLOCK_CONTROL);  in sun50i_usb3_phy_open()
75 	val = readl(phy->regs + SUNXI_ISCR);  in sun50i_usb3_phy_open()
77 	writel(val, phy->regs + SUNXI_ISCR);  in sun50i_usb3_phy_open()
84 	writel(0x0047fc87, phy->regs + SUNXI_PHY_TUNE_LOW);  in sun50i_usb3_phy_open()
86 	val = readl(phy->regs + SUNXI_PHY_TUNE_HIGH);  in sun50i_usb3_phy_open()
95 	writel(val, phy->regs + SUNXI_PHY_TUNE_HIGH);  in sun50i_usb3_phy_open()
98 static int sun50i_usb3_phy_init(struct phy *_phy)  in sun50i_usb3_phy_init()
100 	struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy);  in sun50i_usb3_phy_init()  local
103 	ret = clk_prepare_enable(phy->clk);  in sun50i_usb3_phy_init()
107 	ret = reset_control_deassert(phy->reset);  in sun50i_usb3_phy_init()
109 		clk_disable_unprepare(phy->clk);  in sun50i_usb3_phy_init()
113 	sun50i_usb3_phy_open(phy);  in sun50i_usb3_phy_init()
117 static int sun50i_usb3_phy_exit(struct phy *_phy)  in sun50i_usb3_phy_exit()
119 	struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy);  in sun50i_usb3_phy_exit()  local
121 	reset_control_assert(phy->reset);  in sun50i_usb3_phy_exit()
122 	clk_disable_unprepare(phy->clk);  in sun50i_usb3_phy_exit()
135 	struct sun50i_usb3_phy *phy;  in sun50i_usb3_phy_probe()  local
136 	struct device *dev = &pdev->dev;  in sun50i_usb3_phy_probe()
139 	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);  in sun50i_usb3_phy_probe()
140 	if (!phy)  in sun50i_usb3_phy_probe()
141 		return -ENOMEM;  in sun50i_usb3_phy_probe()
143 	phy->clk = devm_clk_get(dev, NULL);  in sun50i_usb3_phy_probe()
144 	if (IS_ERR(phy->clk)) {  in sun50i_usb3_phy_probe()
145 		if (PTR_ERR(phy->clk) != -EPROBE_DEFER)  in sun50i_usb3_phy_probe()
146 			dev_err(dev, "failed to get phy clock\n");  in sun50i_usb3_phy_probe()
147 		return PTR_ERR(phy->clk);  in sun50i_usb3_phy_probe()
150 	phy->reset = devm_reset_control_get(dev, NULL);  in sun50i_usb3_phy_probe()
151 	if (IS_ERR(phy->reset)) {  in sun50i_usb3_phy_probe()
153 		return PTR_ERR(phy->reset);  in sun50i_usb3_phy_probe()
156 	phy->regs = devm_platform_ioremap_resource(pdev, 0);  in sun50i_usb3_phy_probe()
157 	if (IS_ERR(phy->regs))  in sun50i_usb3_phy_probe()
158 		return PTR_ERR(phy->regs);  in sun50i_usb3_phy_probe()
160 	phy->phy = devm_phy_create(dev, NULL, &sun50i_usb3_phy_ops);  in sun50i_usb3_phy_probe()
161 	if (IS_ERR(phy->phy)) {  in sun50i_usb3_phy_probe()
162 		dev_err(dev, "failed to create PHY\n");  in sun50i_usb3_phy_probe()
163 		return PTR_ERR(phy->phy);  in sun50i_usb3_phy_probe()
166 	phy_set_drvdata(phy->phy, phy);  in sun50i_usb3_phy_probe()
173 	{ .compatible = "allwinner,sun50i-h6-usb3-phy" },
182 		.name  = "sun50i-usb3-phy",
187 MODULE_DESCRIPTION("Allwinner H6 USB 3.0 phy driver");