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_platform.h>
17 #include <linux/of_device.h>
18 #include <linux/phy/phy.h>
19 #include <linux/platform_device.h>
20 #include <linux/reset.h>
21
22 struct ipq4019_usb_phy {
23 struct device *dev;
24 struct phy *phy;
25 void __iomem *base;
26 struct reset_control *por_rst;
27 struct reset_control *srif_rst;
28 };
29
ipq4019_ss_phy_power_off(struct phy * _phy)30 static int ipq4019_ss_phy_power_off(struct phy *_phy)
31 {
32 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
33
34 reset_control_assert(phy->por_rst);
35 msleep(10);
36
37 return 0;
38 }
39
ipq4019_ss_phy_power_on(struct phy * _phy)40 static int ipq4019_ss_phy_power_on(struct phy *_phy)
41 {
42 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
43
44 ipq4019_ss_phy_power_off(_phy);
45
46 reset_control_deassert(phy->por_rst);
47
48 return 0;
49 }
50
51 static const struct phy_ops ipq4019_usb_ss_phy_ops = {
52 .power_on = ipq4019_ss_phy_power_on,
53 .power_off = ipq4019_ss_phy_power_off,
54 };
55
ipq4019_hs_phy_power_off(struct phy * _phy)56 static int ipq4019_hs_phy_power_off(struct phy *_phy)
57 {
58 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
59
60 reset_control_assert(phy->por_rst);
61 msleep(10);
62
63 reset_control_assert(phy->srif_rst);
64 msleep(10);
65
66 return 0;
67 }
68
ipq4019_hs_phy_power_on(struct phy * _phy)69 static int ipq4019_hs_phy_power_on(struct phy *_phy)
70 {
71 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
72
73 ipq4019_hs_phy_power_off(_phy);
74
75 reset_control_deassert(phy->srif_rst);
76 msleep(10);
77
78 reset_control_deassert(phy->por_rst);
79
80 return 0;
81 }
82
83 static const struct phy_ops ipq4019_usb_hs_phy_ops = {
84 .power_on = ipq4019_hs_phy_power_on,
85 .power_off = ipq4019_hs_phy_power_off,
86 };
87
88 static const struct of_device_id ipq4019_usb_phy_of_match[] = {
89 { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
90 { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
91 { },
92 };
93 MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
94
ipq4019_usb_phy_probe(struct platform_device * pdev)95 static int ipq4019_usb_phy_probe(struct platform_device *pdev)
96 {
97 struct device *dev = &pdev->dev;
98 struct resource *res;
99 struct phy_provider *phy_provider;
100 struct ipq4019_usb_phy *phy;
101
102 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
103 if (!phy)
104 return -ENOMEM;
105
106 phy->dev = &pdev->dev;
107 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
108 phy->base = devm_ioremap_resource(&pdev->dev, res);
109 if (IS_ERR(phy->base)) {
110 dev_err(dev, "failed to remap register memory\n");
111 return PTR_ERR(phy->base);
112 }
113
114 phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
115 if (IS_ERR(phy->por_rst)) {
116 if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
117 dev_err(dev, "POR reset is missing\n");
118 return PTR_ERR(phy->por_rst);
119 }
120
121 phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
122 if (IS_ERR(phy->srif_rst))
123 return PTR_ERR(phy->srif_rst);
124
125 phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
126 if (IS_ERR(phy->phy)) {
127 dev_err(dev, "failed to create PHY\n");
128 return PTR_ERR(phy->phy);
129 }
130 phy_set_drvdata(phy->phy, phy);
131
132 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
133
134 return PTR_ERR_OR_ZERO(phy_provider);
135 }
136
137 static struct platform_driver ipq4019_usb_phy_driver = {
138 .probe = ipq4019_usb_phy_probe,
139 .driver = {
140 .of_match_table = ipq4019_usb_phy_of_match,
141 .name = "ipq4019-usb-phy",
142 }
143 };
144 module_platform_driver(ipq4019_usb_phy_driver);
145
146 MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
147 MODULE_AUTHOR("John Crispin <john@phrozen.org>");
148 MODULE_LICENSE("GPL v2");
149
