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cbf919bd JE |
1 | /* |
2 | * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY | |
3 | * | |
4 | * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/clk.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/mfd/syscon.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/phy/phy.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/regmap.h> | |
20 | ||
21 | /* USB OTG PHY register offset and bit in CREG */ | |
22 | #define LPC18XX_CREG_CREG0 0x004 | |
23 | #define LPC18XX_CREG_CREG0_USB0PHY BIT(5) | |
24 | ||
25 | struct lpc18xx_usb_otg_phy { | |
26 | struct phy *phy; | |
27 | struct clk *clk; | |
28 | struct regmap *reg; | |
29 | }; | |
30 | ||
31 | static int lpc18xx_usb_otg_phy_init(struct phy *phy) | |
32 | { | |
33 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
34 | int ret; | |
35 | ||
cfd093bb JE |
36 | /* The PHY must be clocked at 480 MHz */ |
37 | ret = clk_set_rate(lpc->clk, 480000000); | |
cbf919bd JE |
38 | if (ret) |
39 | return ret; | |
40 | ||
cfd093bb | 41 | return clk_prepare(lpc->clk); |
cbf919bd JE |
42 | } |
43 | ||
44 | static int lpc18xx_usb_otg_phy_exit(struct phy *phy) | |
45 | { | |
46 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
47 | ||
48 | clk_unprepare(lpc->clk); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int lpc18xx_usb_otg_phy_power_on(struct phy *phy) | |
54 | { | |
55 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
56 | int ret; | |
57 | ||
58 | ret = clk_enable(lpc->clk); | |
59 | if (ret) | |
60 | return ret; | |
61 | ||
62 | /* The bit in CREG is cleared to enable the PHY */ | |
63 | return regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, | |
64 | LPC18XX_CREG_CREG0_USB0PHY, 0); | |
65 | } | |
66 | ||
67 | static int lpc18xx_usb_otg_phy_power_off(struct phy *phy) | |
68 | { | |
69 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
70 | int ret; | |
71 | ||
72 | ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, | |
73 | LPC18XX_CREG_CREG0_USB0PHY, | |
74 | LPC18XX_CREG_CREG0_USB0PHY); | |
75 | if (ret) | |
76 | return ret; | |
77 | ||
78 | clk_disable(lpc->clk); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static const struct phy_ops lpc18xx_usb_otg_phy_ops = { | |
84 | .init = lpc18xx_usb_otg_phy_init, | |
85 | .exit = lpc18xx_usb_otg_phy_exit, | |
86 | .power_on = lpc18xx_usb_otg_phy_power_on, | |
87 | .power_off = lpc18xx_usb_otg_phy_power_off, | |
88 | .owner = THIS_MODULE, | |
89 | }; | |
90 | ||
91 | static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev) | |
92 | { | |
93 | struct phy_provider *phy_provider; | |
94 | struct lpc18xx_usb_otg_phy *lpc; | |
95 | ||
96 | lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL); | |
97 | if (!lpc) | |
98 | return -ENOMEM; | |
99 | ||
100 | lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent); | |
101 | if (IS_ERR(lpc->reg)) { | |
102 | dev_err(&pdev->dev, "failed to get syscon\n"); | |
103 | return PTR_ERR(lpc->reg); | |
104 | } | |
105 | ||
106 | lpc->clk = devm_clk_get(&pdev->dev, NULL); | |
107 | if (IS_ERR(lpc->clk)) { | |
108 | dev_err(&pdev->dev, "failed to get clock\n"); | |
109 | return PTR_ERR(lpc->clk); | |
110 | } | |
111 | ||
112 | lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops); | |
113 | if (IS_ERR(lpc->phy)) { | |
114 | dev_err(&pdev->dev, "failed to create PHY\n"); | |
115 | return PTR_ERR(lpc->phy); | |
116 | } | |
117 | ||
118 | phy_set_drvdata(lpc->phy, lpc); | |
119 | ||
120 | phy_provider = devm_of_phy_provider_register(&pdev->dev, | |
121 | of_phy_simple_xlate); | |
122 | ||
123 | return PTR_ERR_OR_ZERO(phy_provider); | |
124 | } | |
125 | ||
126 | static const struct of_device_id lpc18xx_usb_otg_phy_match[] = { | |
127 | { .compatible = "nxp,lpc1850-usb-otg-phy" }, | |
128 | { } | |
129 | }; | |
130 | MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match); | |
131 | ||
132 | static struct platform_driver lpc18xx_usb_otg_phy_driver = { | |
133 | .probe = lpc18xx_usb_otg_phy_probe, | |
134 | .driver = { | |
135 | .name = "lpc18xx-usb-otg-phy", | |
136 | .of_match_table = lpc18xx_usb_otg_phy_match, | |
137 | }, | |
138 | }; | |
139 | module_platform_driver(lpc18xx_usb_otg_phy_driver); | |
140 | ||
141 | MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>"); | |
142 | MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver"); | |
143 | MODULE_LICENSE("GPL v2"); |