1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Allwinner sun9i USB phy driver
4  *
5  * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
6  *
7  * Based on phy-sun4i-usb.c from
8  * Hans de Goede <hdegoede@redhat.com>
9  *
10  * and code from
11  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
12  */
13 
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/io.h>
17 #include <linux/module.h>
18 #include <linux/phy/phy.h>
19 #include <linux/usb/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/reset.h>
22 
23 #define SUNXI_AHB_INCR16_BURST_EN	BIT(11)
24 #define SUNXI_AHB_INCR8_BURST_EN	BIT(10)
25 #define SUNXI_AHB_INCR4_BURST_EN	BIT(9)
26 #define SUNXI_AHB_INCRX_ALIGN_EN	BIT(8)
27 #define SUNXI_ULPI_BYPASS_EN		BIT(0)
28 
29 /* usb1 HSIC specific bits */
30 #define SUNXI_EHCI_HS_FORCE		BIT(20)
31 #define SUNXI_HSIC_CONNECT_DET		BIT(17)
32 #define SUNXI_HSIC_CONNECT_INT		BIT(16)
33 #define SUNXI_HSIC			BIT(1)
34 
35 struct sun9i_usb_phy {
36 	struct phy *phy;
37 	void __iomem *pmu;
38 	struct reset_control *reset;
39 	struct clk *clk;
40 	struct clk *hsic_clk;
41 	enum usb_phy_interface type;
42 };
43 
44 static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
45 {
46 	u32 bits, reg_value;
47 
48 	bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
49 		SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
50 		SUNXI_ULPI_BYPASS_EN;
51 
52 	if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
53 		bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
54 			SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
55 
56 	reg_value = readl(phy->pmu);
57 
58 	if (enable)
59 		reg_value |= bits;
60 	else
61 		reg_value &= ~bits;
62 
63 	writel(reg_value, phy->pmu);
64 }
65 
66 static int sun9i_usb_phy_init(struct phy *_phy)
67 {
68 	struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
69 	int ret;
70 
71 	ret = clk_prepare_enable(phy->clk);
72 	if (ret)
73 		goto err_clk;
74 
75 	ret = clk_prepare_enable(phy->hsic_clk);
76 	if (ret)
77 		goto err_hsic_clk;
78 
79 	ret = reset_control_deassert(phy->reset);
80 	if (ret)
81 		goto err_reset;
82 
83 	sun9i_usb_phy_passby(phy, 1);
84 	return 0;
85 
86 err_reset:
87 	clk_disable_unprepare(phy->hsic_clk);
88 
89 err_hsic_clk:
90 	clk_disable_unprepare(phy->clk);
91 
92 err_clk:
93 	return ret;
94 }
95 
96 static int sun9i_usb_phy_exit(struct phy *_phy)
97 {
98 	struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
99 
100 	sun9i_usb_phy_passby(phy, 0);
101 	reset_control_assert(phy->reset);
102 	clk_disable_unprepare(phy->hsic_clk);
103 	clk_disable_unprepare(phy->clk);
104 
105 	return 0;
106 }
107 
108 static const struct phy_ops sun9i_usb_phy_ops = {
109 	.init		= sun9i_usb_phy_init,
110 	.exit		= sun9i_usb_phy_exit,
111 	.owner		= THIS_MODULE,
112 };
113 
114 static int sun9i_usb_phy_probe(struct platform_device *pdev)
115 {
116 	struct sun9i_usb_phy *phy;
117 	struct device *dev = &pdev->dev;
118 	struct device_node *np = dev->of_node;
119 	struct phy_provider *phy_provider;
120 
121 	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
122 	if (!phy)
123 		return -ENOMEM;
124 
125 	phy->type = of_usb_get_phy_mode(np);
126 	if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
127 		phy->clk = devm_clk_get(dev, "hsic_480M");
128 		if (IS_ERR(phy->clk)) {
129 			dev_err(dev, "failed to get hsic_480M clock\n");
130 			return PTR_ERR(phy->clk);
131 		}
132 
133 		phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
134 		if (IS_ERR(phy->hsic_clk)) {
135 			dev_err(dev, "failed to get hsic_12M clock\n");
136 			return PTR_ERR(phy->hsic_clk);
137 		}
138 
139 		phy->reset = devm_reset_control_get(dev, "hsic");
140 		if (IS_ERR(phy->reset)) {
141 			dev_err(dev, "failed to get reset control\n");
142 			return PTR_ERR(phy->reset);
143 		}
144 	} else {
145 		phy->clk = devm_clk_get(dev, "phy");
146 		if (IS_ERR(phy->clk)) {
147 			dev_err(dev, "failed to get phy clock\n");
148 			return PTR_ERR(phy->clk);
149 		}
150 
151 		phy->reset = devm_reset_control_get(dev, "phy");
152 		if (IS_ERR(phy->reset)) {
153 			dev_err(dev, "failed to get reset control\n");
154 			return PTR_ERR(phy->reset);
155 		}
156 	}
157 
158 	phy->pmu = devm_platform_ioremap_resource(pdev, 0);
159 	if (IS_ERR(phy->pmu))
160 		return PTR_ERR(phy->pmu);
161 
162 	phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
163 	if (IS_ERR(phy->phy)) {
164 		dev_err(dev, "failed to create PHY\n");
165 		return PTR_ERR(phy->phy);
166 	}
167 
168 	phy_set_drvdata(phy->phy, phy);
169 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
170 
171 	return PTR_ERR_OR_ZERO(phy_provider);
172 }
173 
174 static const struct of_device_id sun9i_usb_phy_of_match[] = {
175 	{ .compatible = "allwinner,sun9i-a80-usb-phy" },
176 	{ },
177 };
178 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
179 
180 static struct platform_driver sun9i_usb_phy_driver = {
181 	.probe	= sun9i_usb_phy_probe,
182 	.driver = {
183 		.of_match_table	= sun9i_usb_phy_of_match,
184 		.name  = "sun9i-usb-phy",
185 	}
186 };
187 module_platform_driver(sun9i_usb_phy_driver);
188 
189 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
190 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
191 MODULE_LICENSE("GPL");
192