1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2018 John Crispin <john@phrozen.org>
4 *
5 * Based on code from
6 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
7 *
8 */
9
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/io.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/mutex.h>
16#include <linux/of.h>
17#include <linux/phy/phy.h>
18#include <linux/platform_device.h>
19#include <linux/reset.h>
20
21struct ipq4019_usb_phy {
22	struct device		*dev;
23	struct phy		*phy;
24	void __iomem		*base;
25	struct reset_control	*por_rst;
26	struct reset_control	*srif_rst;
27};
28
29static int ipq4019_ss_phy_power_off(struct phy *_phy)
30{
31	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
32
33	reset_control_assert(phy->por_rst);
34	msleep(10);
35
36	return 0;
37}
38
39static int ipq4019_ss_phy_power_on(struct phy *_phy)
40{
41	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
42
43	ipq4019_ss_phy_power_off(_phy);
44
45	reset_control_deassert(phy->por_rst);
46
47	return 0;
48}
49
50static const struct phy_ops ipq4019_usb_ss_phy_ops = {
51	.power_on	= ipq4019_ss_phy_power_on,
52	.power_off	= ipq4019_ss_phy_power_off,
53};
54
55static int ipq4019_hs_phy_power_off(struct phy *_phy)
56{
57	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
58
59	reset_control_assert(phy->por_rst);
60	msleep(10);
61
62	reset_control_assert(phy->srif_rst);
63	msleep(10);
64
65	return 0;
66}
67
68static int ipq4019_hs_phy_power_on(struct phy *_phy)
69{
70	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
71
72	ipq4019_hs_phy_power_off(_phy);
73
74	reset_control_deassert(phy->srif_rst);
75	msleep(10);
76
77	reset_control_deassert(phy->por_rst);
78
79	return 0;
80}
81
82static const struct phy_ops ipq4019_usb_hs_phy_ops = {
83	.power_on	= ipq4019_hs_phy_power_on,
84	.power_off	= ipq4019_hs_phy_power_off,
85};
86
87static const struct of_device_id ipq4019_usb_phy_of_match[] = {
88	{ .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
89	{ .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
90	{ },
91};
92MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
93
94static int ipq4019_usb_phy_probe(struct platform_device *pdev)
95{
96	struct device *dev = &pdev->dev;
97	struct phy_provider *phy_provider;
98	struct ipq4019_usb_phy *phy;
99
100	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
101	if (!phy)
102		return -ENOMEM;
103
104	phy->dev = &pdev->dev;
105	phy->base = devm_platform_ioremap_resource(pdev, 0);
106	if (IS_ERR(phy->base)) {
107		dev_err(dev, "failed to remap register memory\n");
108		return PTR_ERR(phy->base);
109	}
110
111	phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
112	if (IS_ERR(phy->por_rst)) {
113		if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
114			dev_err(dev, "POR reset is missing\n");
115		return PTR_ERR(phy->por_rst);
116	}
117
118	phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
119	if (IS_ERR(phy->srif_rst))
120		return PTR_ERR(phy->srif_rst);
121
122	phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
123	if (IS_ERR(phy->phy)) {
124		dev_err(dev, "failed to create PHY\n");
125		return PTR_ERR(phy->phy);
126	}
127	phy_set_drvdata(phy->phy, phy);
128
129	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
130
131	return PTR_ERR_OR_ZERO(phy_provider);
132}
133
134static struct platform_driver ipq4019_usb_phy_driver = {
135	.probe	= ipq4019_usb_phy_probe,
136	.driver = {
137		.of_match_table	= ipq4019_usb_phy_of_match,
138		.name  = "ipq4019-usb-phy",
139	}
140};
141module_platform_driver(ipq4019_usb_phy_driver);
142
143MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
144MODULE_AUTHOR("John Crispin <john@phrozen.org>");
145MODULE_LICENSE("GPL v2");
146