phy-hi6220-usb.c

  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
 44struct hi6220_priv {
 45	struct regmap *reg;
 46	struct device *dev;
 47};
 48
 49static 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
 61static 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;
 93out:
 94	dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
 95	return ret;
 96}
 97
 98static 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
105static 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
112static const struct phy_ops hi6220_phy_ops = {
113	.init		= hi6220_phy_start,
114	.exit		= hi6220_phy_exit,
115	.owner		= THIS_MODULE,
116};
117
118static 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
148static const struct of_device_id hi6220_phy_of_match[] = {
149	{.compatible = "hisilicon,hi6220-usb-phy",},
150	{ },
151};
152MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
153
154static 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};
161module_platform_driver(hi6220_phy_driver);
162
163MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
164MODULE_LICENSE("GPL");