1// SPDX-License-Identifier: GPL-2.0
2#include <linux/module.h>
3#include <linux/platform_device.h>
4#include <linux/dma-mapping.h>
5#include <linux/usb/otg.h>
6#include <linux/usb/usb_phy_generic.h>
7#include <linux/slab.h>
8#include <linux/clk.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11#include <linux/usb/of.h>
12
13#include "phy-am335x-control.h"
14#include "phy-generic.h"
15
16struct am335x_phy {
17	struct usb_phy_generic usb_phy_gen;
18	struct phy_control *phy_ctrl;
19	int id;
20	enum usb_dr_mode dr_mode;
21};
22
23static int am335x_init(struct usb_phy *phy)
24{
25	struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
26
27	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
28	return 0;
29}
30
31static void am335x_shutdown(struct usb_phy *phy)
32{
33	struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
34
35	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
36}
37
38static int am335x_phy_probe(struct platform_device *pdev)
39{
40	struct am335x_phy *am_phy;
41	struct device *dev = &pdev->dev;
42	int ret;
43
44	am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
45	if (!am_phy)
46		return -ENOMEM;
47
48	am_phy->phy_ctrl = am335x_get_phy_control(dev);
49	if (!am_phy->phy_ctrl)
50		return -EPROBE_DEFER;
51
52	am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
53	if (am_phy->id < 0) {
54		dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
55		return am_phy->id;
56	}
57
58	am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
59
60	ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen);
61	if (ret)
62		return ret;
63
64	am_phy->usb_phy_gen.phy.init = am335x_init;
65	am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
66
67	platform_set_drvdata(pdev, am_phy);
68	device_init_wakeup(dev, true);
69
70	/*
71	 * If we leave PHY wakeup enabled then AM33XX wakes up
72	 * immediately from DS0. To avoid this we mark dev->power.can_wakeup
73	 * to false. The same is checked in suspend routine to decide
74	 * on whether to enable PHY wakeup or not.
75	 * PHY wakeup works fine in standby mode, there by allowing us to
76	 * handle remote wakeup, wakeup on disconnect and connect.
77	 */
78
79	device_set_wakeup_enable(dev, false);
80	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
81
82	return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
83}
84
85static int am335x_phy_remove(struct platform_device *pdev)
86{
87	struct am335x_phy *am_phy = platform_get_drvdata(pdev);
88
89	usb_remove_phy(&am_phy->usb_phy_gen.phy);
90	return 0;
91}
92
93#ifdef CONFIG_PM_SLEEP
94static int am335x_phy_suspend(struct device *dev)
95{
96	struct am335x_phy *am_phy = dev_get_drvdata(dev);
97
98	/*
99	 * Enable phy wakeup only if dev->power.can_wakeup is true.
100	 * Make sure to enable wakeup to support remote wakeup	in
101	 * standby mode ( same is not supported in OFF(DS0) mode).
102	 * Enable it by doing
103	 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
104	 */
105
106	if (device_may_wakeup(dev))
107		phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
108
109	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
110
111	return 0;
112}
113
114static int am335x_phy_resume(struct device *dev)
115{
116	struct am335x_phy	*am_phy = dev_get_drvdata(dev);
117
118	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
119
120	if (device_may_wakeup(dev))
121		phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
122
123	return 0;
124}
125#endif
126
127static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
128
129static const struct of_device_id am335x_phy_ids[] = {
130	{ .compatible = "ti,am335x-usb-phy" },
131	{ }
132};
133MODULE_DEVICE_TABLE(of, am335x_phy_ids);
134
135static struct platform_driver am335x_phy_driver = {
136	.probe          = am335x_phy_probe,
137	.remove         = am335x_phy_remove,
138	.driver         = {
139		.name   = "am335x-phy-driver",
140		.pm = &am335x_pm_ops,
141		.of_match_table = am335x_phy_ids,
142	},
143};
144
145module_platform_driver(am335x_phy_driver);
146MODULE_LICENSE("GPL v2");
147