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