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
 43struct hi6220_priv {
 44	struct regmap *reg;
 45	struct device *dev;
 46};
 47
 48static 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
 60static 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;
 92out:
 93	dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
 94	return ret;
 95}
 96
 97static 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
104static 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
111static const struct phy_ops hi6220_phy_ops = {
112	.init		= hi6220_phy_start,
113	.exit		= hi6220_phy_exit,
114	.owner		= THIS_MODULE,
115};
116
117static 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
147static const struct of_device_id hi6220_phy_of_match[] = {
148	{.compatible = "hisilicon,hi6220-usb-phy",},
149	{ },
150};
151MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
152
153static 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};
160module_platform_driver(hi6220_phy_driver);
161
162MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
163MODULE_ALIAS("platform:hi6220-usb-phy");
164MODULE_LICENSE("GPL");