treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / phy / allwinner / phy-sun9i-usb.c
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         struct resource *res;
121
122         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
123         if (!phy)
124                 return -ENOMEM;
125
126         phy->type = of_usb_get_phy_mode(np);
127         if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
128                 phy->clk = devm_clk_get(dev, "hsic_480M");
129                 if (IS_ERR(phy->clk)) {
130                         dev_err(dev, "failed to get hsic_480M clock\n");
131                         return PTR_ERR(phy->clk);
132                 }
133
134                 phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
135                 if (IS_ERR(phy->hsic_clk)) {
136                         dev_err(dev, "failed to get hsic_12M clock\n");
137                         return PTR_ERR(phy->hsic_clk);
138                 }
139
140                 phy->reset = devm_reset_control_get(dev, "hsic");
141                 if (IS_ERR(phy->reset)) {
142                         dev_err(dev, "failed to get reset control\n");
143                         return PTR_ERR(phy->reset);
144                 }
145         } else {
146                 phy->clk = devm_clk_get(dev, "phy");
147                 if (IS_ERR(phy->clk)) {
148                         dev_err(dev, "failed to get phy clock\n");
149                         return PTR_ERR(phy->clk);
150                 }
151
152                 phy->reset = devm_reset_control_get(dev, "phy");
153                 if (IS_ERR(phy->reset)) {
154                         dev_err(dev, "failed to get reset control\n");
155                         return PTR_ERR(phy->reset);
156                 }
157         }
158
159         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160         phy->pmu = devm_ioremap_resource(dev, res);
161         if (IS_ERR(phy->pmu))
162                 return PTR_ERR(phy->pmu);
163
164         phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
165         if (IS_ERR(phy->phy)) {
166                 dev_err(dev, "failed to create PHY\n");
167                 return PTR_ERR(phy->phy);
168         }
169
170         phy_set_drvdata(phy->phy, phy);
171         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
172
173         return PTR_ERR_OR_ZERO(phy_provider);
174 }
175
176 static const struct of_device_id sun9i_usb_phy_of_match[] = {
177         { .compatible = "allwinner,sun9i-a80-usb-phy" },
178         { },
179 };
180 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
181
182 static struct platform_driver sun9i_usb_phy_driver = {
183         .probe  = sun9i_usb_phy_probe,
184         .driver = {
185                 .of_match_table = sun9i_usb_phy_of_match,
186                 .name  = "sun9i-usb-phy",
187         }
188 };
189 module_platform_driver(sun9i_usb_phy_driver);
190
191 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
192 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
193 MODULE_LICENSE("GPL");