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 
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 
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 
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 
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 
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