1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2015 Linaro Ltd.
4 * Copyright (c) 2015 HiSilicon Limited.
5 */
6
7 #include <linux/mfd/syscon.h>
8 #include <linux/mod_devicetable.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/phy/phy.h>
12 #include <linux/regmap.h>
13
14 #define SC_PERIPH_CTRL4 0x00c
15
16 #define CTRL4_PICO_SIDDQ BIT(6)
17 #define CTRL4_PICO_OGDISABLE BIT(8)
18 #define CTRL4_PICO_VBUSVLDEXT BIT(10)
19 #define CTRL4_PICO_VBUSVLDEXTSEL BIT(11)
20 #define CTRL4_OTG_PHY_SEL BIT(21)
21
22 #define SC_PERIPH_CTRL5 0x010
23
24 #define CTRL5_USBOTG_RES_SEL BIT(3)
25 #define CTRL5_PICOPHY_ACAENB BIT(4)
26 #define CTRL5_PICOPHY_BC_MODE BIT(5)
27 #define CTRL5_PICOPHY_CHRGSEL BIT(6)
28 #define CTRL5_PICOPHY_VDATSRCEND BIT(7)
29 #define CTRL5_PICOPHY_VDATDETENB BIT(8)
30 #define CTRL5_PICOPHY_DCDENB BIT(9)
31 #define CTRL5_PICOPHY_IDDIG BIT(10)
32
33 #define SC_PERIPH_CTRL8 0x018
34 #define SC_PERIPH_RSTEN0 0x300
35 #define SC_PERIPH_RSTDIS0 0x304
36
37 #define RST0_USBOTG_BUS BIT(4)
38 #define RST0_POR_PICOPHY BIT(5)
39 #define RST0_USBOTG BIT(6)
40 #define RST0_USBOTG_32K BIT(7)
41
42 #define EYE_PATTERN_PARA 0x7053348c
43
44 struct hi6220_priv {
45 struct regmap *reg;
46 struct device *dev;
47 };
48
hi6220_phy_init(struct hi6220_priv * priv)49 static void hi6220_phy_init(struct hi6220_priv *priv)
50 {
51 struct regmap *reg = priv->reg;
52 u32 val, mask;
53
54 val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
55 RST0_USBOTG | RST0_USBOTG_32K;
56 mask = val;
57 regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
58 regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
59 }
60
hi6220_phy_setup(struct hi6220_priv * priv,bool on)61 static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
62 {
63 struct regmap *reg = priv->reg;
64 u32 val, mask;
65 int ret;
66
67 if (on) {
68 val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
69 mask = val | CTRL5_PICOPHY_BC_MODE;
70 ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
71 if (ret)
72 goto out;
73
74 val = CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
75 CTRL4_OTG_PHY_SEL;
76 mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
77 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
78 if (ret)
79 goto out;
80
81 ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
82 if (ret)
83 goto out;
84 } else {
85 val = CTRL4_PICO_SIDDQ;
86 mask = val;
87 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
88 if (ret)
89 goto out;
90 }
91
92 return 0;
93 out:
94 dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
95 return ret;
96 }
97
hi6220_phy_start(struct phy * phy)98 static int hi6220_phy_start(struct phy *phy)
99 {
100 struct hi6220_priv *priv = phy_get_drvdata(phy);
101
102 return hi6220_phy_setup(priv, true);
103 }
104
hi6220_phy_exit(struct phy * phy)105 static int hi6220_phy_exit(struct phy *phy)
106 {
107 struct hi6220_priv *priv = phy_get_drvdata(phy);
108
109 return hi6220_phy_setup(priv, false);
110 }
111
112 static const struct phy_ops hi6220_phy_ops = {
113 .init = hi6220_phy_start,
114 .exit = hi6220_phy_exit,
115 .owner = THIS_MODULE,
116 };
117
hi6220_phy_probe(struct platform_device * pdev)118 static int hi6220_phy_probe(struct platform_device *pdev)
119 {
120 struct phy_provider *phy_provider;
121 struct device *dev = &pdev->dev;
122 struct phy *phy;
123 struct hi6220_priv *priv;
124
125 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
126 if (!priv)
127 return -ENOMEM;
128
129 priv->dev = dev;
130 priv->reg = syscon_regmap_lookup_by_phandle(dev->of_node,
131 "hisilicon,peripheral-syscon");
132 if (IS_ERR(priv->reg)) {
133 dev_err(dev, "no hisilicon,peripheral-syscon\n");
134 return PTR_ERR(priv->reg);
135 }
136
137 hi6220_phy_init(priv);
138
139 phy = devm_phy_create(dev, NULL, &hi6220_phy_ops);
140 if (IS_ERR(phy))
141 return PTR_ERR(phy);
142
143 phy_set_drvdata(phy, priv);
144 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
145 return PTR_ERR_OR_ZERO(phy_provider);
146 }
147
148 static const struct of_device_id hi6220_phy_of_match[] = {
149 {.compatible = "hisilicon,hi6220-usb-phy",},
150 { },
151 };
152 MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
153
154 static struct platform_driver hi6220_phy_driver = {
155 .probe = hi6220_phy_probe,
156 .driver = {
157 .name = "hi6220-usb-phy",
158 .of_match_table = hi6220_phy_of_match,
159 }
160 };
161 module_platform_driver(hi6220_phy_driver);
162
163 MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
164 MODULE_ALIAS("platform:hi6220-usb-phy");
165 MODULE_LICENSE("GPL");
166