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