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f2e60041 DL |
1 | /* |
2 | * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver | |
3 | * | |
4 | * Copyright (C) 2016 David Lechner <david@lechnology.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/clk.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/mfd/da8xx-cfgchip.h> | |
20 | #include <linux/mfd/syscon.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/phy/phy.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/regmap.h> | |
25 | ||
26 | struct da8xx_usb_phy { | |
27 | struct phy_provider *phy_provider; | |
28 | struct phy *usb11_phy; | |
29 | struct phy *usb20_phy; | |
30 | struct clk *usb11_clk; | |
31 | struct clk *usb20_clk; | |
32 | struct regmap *regmap; | |
33 | }; | |
34 | ||
35 | static int da8xx_usb11_phy_power_on(struct phy *phy) | |
36 | { | |
37 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); | |
38 | int ret; | |
39 | ||
40 | ret = clk_prepare_enable(d_phy->usb11_clk); | |
41 | if (ret) | |
42 | return ret; | |
43 | ||
44 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, | |
45 | CFGCHIP2_USB1SUSPENDM); | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static int da8xx_usb11_phy_power_off(struct phy *phy) | |
51 | { | |
52 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); | |
53 | ||
54 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0); | |
55 | ||
56 | clk_disable_unprepare(d_phy->usb11_clk); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | static const struct phy_ops da8xx_usb11_phy_ops = { | |
62 | .power_on = da8xx_usb11_phy_power_on, | |
63 | .power_off = da8xx_usb11_phy_power_off, | |
64 | .owner = THIS_MODULE, | |
65 | }; | |
66 | ||
67 | static int da8xx_usb20_phy_power_on(struct phy *phy) | |
68 | { | |
69 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); | |
70 | int ret; | |
71 | ||
72 | ret = clk_prepare_enable(d_phy->usb20_clk); | |
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int da8xx_usb20_phy_power_off(struct phy *phy) | |
82 | { | |
83 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); | |
84 | ||
85 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, | |
86 | CFGCHIP2_OTGPWRDN); | |
87 | ||
88 | clk_disable_unprepare(d_phy->usb20_clk); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode) | |
94 | { | |
95 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); | |
96 | u32 val; | |
97 | ||
98 | switch (mode) { | |
99 | case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */ | |
100 | val = CFGCHIP2_OTGMODE_FORCE_HOST; | |
101 | break; | |
102 | case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */ | |
103 | val = CFGCHIP2_OTGMODE_FORCE_DEVICE; | |
104 | break; | |
105 | case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */ | |
106 | val = CFGCHIP2_OTGMODE_NO_OVERRIDE; | |
107 | break; | |
108 | default: | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK, | |
113 | val); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static const struct phy_ops da8xx_usb20_phy_ops = { | |
119 | .power_on = da8xx_usb20_phy_power_on, | |
120 | .power_off = da8xx_usb20_phy_power_off, | |
121 | .set_mode = da8xx_usb20_phy_set_mode, | |
122 | .owner = THIS_MODULE, | |
123 | }; | |
124 | ||
125 | static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, | |
126 | struct of_phandle_args *args) | |
127 | { | |
128 | struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); | |
129 | ||
130 | if (!d_phy) | |
131 | return ERR_PTR(-ENODEV); | |
132 | ||
133 | switch (args->args[0]) { | |
134 | case 0: | |
135 | return d_phy->usb20_phy; | |
136 | case 1: | |
137 | return d_phy->usb11_phy; | |
138 | default: | |
139 | return ERR_PTR(-EINVAL); | |
140 | } | |
141 | } | |
142 | ||
143 | static int da8xx_usb_phy_probe(struct platform_device *pdev) | |
144 | { | |
145 | struct device *dev = &pdev->dev; | |
146 | struct device_node *node = dev->of_node; | |
147 | struct da8xx_usb_phy *d_phy; | |
148 | ||
149 | d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL); | |
150 | if (!d_phy) | |
151 | return -ENOMEM; | |
152 | ||
153 | if (node) | |
154 | d_phy->regmap = syscon_regmap_lookup_by_compatible( | |
155 | "ti,da830-cfgchip"); | |
156 | else | |
157 | d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon.0"); | |
158 | if (IS_ERR(d_phy->regmap)) { | |
159 | dev_err(dev, "Failed to get syscon\n"); | |
160 | return PTR_ERR(d_phy->regmap); | |
161 | } | |
162 | ||
163 | d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy"); | |
164 | if (IS_ERR(d_phy->usb11_clk)) { | |
165 | dev_err(dev, "Failed to get usb11_phy clock\n"); | |
166 | return PTR_ERR(d_phy->usb11_clk); | |
167 | } | |
168 | ||
169 | d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy"); | |
170 | if (IS_ERR(d_phy->usb20_clk)) { | |
171 | dev_err(dev, "Failed to get usb20_phy clock\n"); | |
172 | return PTR_ERR(d_phy->usb20_clk); | |
173 | } | |
174 | ||
175 | d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops); | |
176 | if (IS_ERR(d_phy->usb11_phy)) { | |
177 | dev_err(dev, "Failed to create usb11 phy\n"); | |
178 | return PTR_ERR(d_phy->usb11_phy); | |
179 | } | |
180 | ||
181 | d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops); | |
182 | if (IS_ERR(d_phy->usb20_phy)) { | |
183 | dev_err(dev, "Failed to create usb20 phy\n"); | |
184 | return PTR_ERR(d_phy->usb20_phy); | |
185 | } | |
186 | ||
187 | platform_set_drvdata(pdev, d_phy); | |
188 | phy_set_drvdata(d_phy->usb11_phy, d_phy); | |
189 | phy_set_drvdata(d_phy->usb20_phy, d_phy); | |
190 | ||
191 | if (node) { | |
192 | d_phy->phy_provider = devm_of_phy_provider_register(dev, | |
193 | da8xx_usb_phy_of_xlate); | |
194 | if (IS_ERR(d_phy->phy_provider)) { | |
195 | dev_err(dev, "Failed to create phy provider\n"); | |
196 | return PTR_ERR(d_phy->phy_provider); | |
197 | } | |
198 | } else { | |
199 | int ret; | |
200 | ||
201 | ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0"); | |
202 | if (ret) | |
203 | dev_warn(dev, "Failed to create usb11 phy lookup\n"); | |
204 | ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy", | |
205 | "musb-da8xx"); | |
206 | if (ret) | |
207 | dev_warn(dev, "Failed to create usb20 phy lookup\n"); | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int da8xx_usb_phy_remove(struct platform_device *pdev) | |
214 | { | |
215 | struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); | |
216 | ||
217 | if (!pdev->dev.of_node) { | |
218 | phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); | |
219 | phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0"); | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static const struct of_device_id da8xx_usb_phy_ids[] = { | |
226 | { .compatible = "ti,da830-usb-phy" }, | |
227 | { } | |
228 | }; | |
229 | MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids); | |
230 | ||
231 | static struct platform_driver da8xx_usb_phy_driver = { | |
232 | .probe = da8xx_usb_phy_probe, | |
233 | .remove = da8xx_usb_phy_remove, | |
234 | .driver = { | |
235 | .name = "da8xx-usb-phy", | |
236 | .of_match_table = da8xx_usb_phy_ids, | |
237 | }, | |
238 | }; | |
239 | ||
240 | module_platform_driver(da8xx_usb_phy_driver); | |
241 | ||
242 | MODULE_ALIAS("platform:da8xx-usb-phy"); | |
243 | MODULE_AUTHOR("David Lechner <david@lechnology.com>"); | |
244 | MODULE_DESCRIPTION("TI DA8xx USB PHY driver"); | |
245 | MODULE_LICENSE("GPL v2"); |