Commit | Line | Data |
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64d11406 YL |
1 | /* |
2 | * Rockchip usb PHY driver | |
3 | * | |
4 | * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com> | |
5 | * Copyright (C) 2014 ROCKCHIP, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/clk.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_address.h> | |
24 | #include <linux/phy/phy.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/regulator/consumer.h> | |
27 | #include <linux/reset.h> | |
28 | #include <linux/regmap.h> | |
29 | #include <linux/mfd/syscon.h> | |
30 | ||
31 | /* | |
32 | * The higher 16-bit of this register is used for write protection | |
33 | * only if BIT(13 + 16) set to 1 the BIT(13) can be written. | |
34 | */ | |
35 | #define SIDDQ_WRITE_ENA BIT(29) | |
36 | #define SIDDQ_ON BIT(13) | |
37 | #define SIDDQ_OFF (0 << 13) | |
38 | ||
5fdbb97d HS |
39 | struct rockchip_usb_phy_base { |
40 | struct device *dev; | |
41 | struct regmap *reg_base; | |
42 | }; | |
43 | ||
64d11406 | 44 | struct rockchip_usb_phy { |
5fdbb97d | 45 | struct rockchip_usb_phy_base *base; |
64d11406 | 46 | unsigned int reg_offset; |
64d11406 YL |
47 | struct clk *clk; |
48 | struct phy *phy; | |
49 | }; | |
50 | ||
51 | static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy, | |
52 | bool siddq) | |
53 | { | |
5fdbb97d | 54 | return regmap_write(phy->base->reg_base, phy->reg_offset, |
64d11406 YL |
55 | SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF)); |
56 | } | |
57 | ||
58 | static int rockchip_usb_phy_power_off(struct phy *_phy) | |
59 | { | |
60 | struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); | |
61 | int ret = 0; | |
62 | ||
63 | /* Power down usb phy analog blocks by set siddq 1 */ | |
64 | ret = rockchip_usb_phy_power(phy, 1); | |
65 | if (ret) | |
66 | return ret; | |
67 | ||
68 | clk_disable_unprepare(phy->clk); | |
64d11406 YL |
69 | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int rockchip_usb_phy_power_on(struct phy *_phy) | |
74 | { | |
75 | struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); | |
76 | int ret = 0; | |
77 | ||
78 | ret = clk_prepare_enable(phy->clk); | |
79 | if (ret) | |
80 | return ret; | |
81 | ||
82 | /* Power up usb phy analog blocks by set siddq 0 */ | |
83 | ret = rockchip_usb_phy_power(phy, 0); | |
6b08e36b AL |
84 | if (ret) { |
85 | clk_disable_unprepare(phy->clk); | |
64d11406 | 86 | return ret; |
6b08e36b | 87 | } |
64d11406 YL |
88 | |
89 | return 0; | |
90 | } | |
91 | ||
4a9e5ca1 | 92 | static const struct phy_ops ops = { |
64d11406 YL |
93 | .power_on = rockchip_usb_phy_power_on, |
94 | .power_off = rockchip_usb_phy_power_off, | |
95 | .owner = THIS_MODULE, | |
96 | }; | |
97 | ||
75d390fe HS |
98 | static void rockchip_usb_phy_action(void *data) |
99 | { | |
100 | struct rockchip_usb_phy *rk_phy = data; | |
101 | ||
102 | if (rk_phy->clk) | |
103 | clk_put(rk_phy->clk); | |
104 | } | |
105 | ||
97dd9101 HS |
106 | static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base, |
107 | struct device_node *child) | |
108 | { | |
109 | struct rockchip_usb_phy *rk_phy; | |
110 | unsigned int reg_offset; | |
111 | int err; | |
112 | ||
113 | rk_phy = devm_kzalloc(base->dev, sizeof(*rk_phy), GFP_KERNEL); | |
114 | if (!rk_phy) | |
115 | return -ENOMEM; | |
116 | ||
117 | rk_phy->base = base; | |
118 | ||
119 | if (of_property_read_u32(child, "reg", ®_offset)) { | |
120 | dev_err(base->dev, "missing reg property in node %s\n", | |
121 | child->name); | |
122 | return -EINVAL; | |
123 | } | |
124 | ||
125 | rk_phy->reg_offset = reg_offset; | |
126 | ||
127 | err = devm_add_action(base->dev, rockchip_usb_phy_action, rk_phy); | |
128 | if (err) | |
129 | return err; | |
130 | ||
131 | rk_phy->clk = of_clk_get_by_name(child, "phyclk"); | |
132 | if (IS_ERR(rk_phy->clk)) | |
133 | rk_phy->clk = NULL; | |
134 | ||
135 | rk_phy->phy = devm_phy_create(base->dev, child, &ops); | |
136 | if (IS_ERR(rk_phy->phy)) { | |
137 | dev_err(base->dev, "failed to create PHY\n"); | |
138 | return PTR_ERR(rk_phy->phy); | |
139 | } | |
140 | phy_set_drvdata(rk_phy->phy, rk_phy); | |
141 | ||
142 | /* only power up usb phy when it use, so disable it when init*/ | |
143 | return rockchip_usb_phy_power(rk_phy, 1); | |
144 | } | |
145 | ||
64d11406 YL |
146 | static int rockchip_usb_phy_probe(struct platform_device *pdev) |
147 | { | |
148 | struct device *dev = &pdev->dev; | |
5fdbb97d | 149 | struct rockchip_usb_phy_base *phy_base; |
64d11406 YL |
150 | struct phy_provider *phy_provider; |
151 | struct device_node *child; | |
08db7e5c | 152 | int err; |
64d11406 | 153 | |
5fdbb97d HS |
154 | phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL); |
155 | if (!phy_base) | |
156 | return -ENOMEM; | |
157 | ||
158 | phy_base->dev = dev; | |
159 | phy_base->reg_base = syscon_regmap_lookup_by_phandle(dev->of_node, | |
160 | "rockchip,grf"); | |
161 | if (IS_ERR(phy_base->reg_base)) { | |
64d11406 | 162 | dev_err(&pdev->dev, "Missing rockchip,grf property\n"); |
5fdbb97d | 163 | return PTR_ERR(phy_base->reg_base); |
64d11406 YL |
164 | } |
165 | ||
166 | for_each_available_child_of_node(dev->of_node, child) { | |
97dd9101 HS |
167 | err = rockchip_usb_phy_init(phy_base, child); |
168 | if (err) { | |
169 | of_node_put(child); | |
75d390fe | 170 | return err; |
64d11406 | 171 | } |
64d11406 YL |
172 | } |
173 | ||
174 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); | |
175 | return PTR_ERR_OR_ZERO(phy_provider); | |
176 | } | |
177 | ||
178 | static const struct of_device_id rockchip_usb_phy_dt_ids[] = { | |
179 | { .compatible = "rockchip,rk3288-usb-phy" }, | |
180 | {} | |
181 | }; | |
182 | ||
183 | MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids); | |
184 | ||
185 | static struct platform_driver rockchip_usb_driver = { | |
186 | .probe = rockchip_usb_phy_probe, | |
187 | .driver = { | |
188 | .name = "rockchip-usb-phy", | |
64d11406 YL |
189 | .of_match_table = rockchip_usb_phy_dt_ids, |
190 | }, | |
191 | }; | |
192 | ||
193 | module_platform_driver(rockchip_usb_driver); | |
194 | ||
195 | MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>"); | |
196 | MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver"); | |
197 | MODULE_LICENSE("GPL v2"); |