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 
21 struct 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 
29 static 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 
39 static 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 
50 static 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 
55 static 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 
68 static 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 
82 static 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 
87 static 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 };
92 MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
93 
94 static 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 
134 static 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 };
141 module_platform_driver(ipq4019_usb_phy_driver);
142 
143 MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
144 MODULE_AUTHOR("John Crispin <john@phrozen.org>");
145 MODULE_LICENSE("GPL v2");
146