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
sun9i_usb_phy_passby(struct sun9i_usb_phy * phy,int enable)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
sun9i_usb_phy_init(struct phy * _phy)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
sun9i_usb_phy_exit(struct phy * _phy)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
sun9i_usb_phy_probe(struct platform_device * pdev)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