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 void 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}
91
92#ifdef CONFIG_PM_SLEEP
93static int am335x_phy_suspend(struct device *dev)
94{
95	struct am335x_phy *am_phy = dev_get_drvdata(dev);
96
97	/*
98	 * Enable phy wakeup only if dev->power.can_wakeup is true.
99	 * Make sure to enable wakeup to support remote wakeup	in
100	 * standby mode ( same is not supported in OFF(DS0) mode).
101	 * Enable it by doing
102	 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
103	 */
104
105	if (device_may_wakeup(dev))
106		phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
107
108	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
109
110	return 0;
111}
112
113static int am335x_phy_resume(struct device *dev)
114{
115	struct am335x_phy	*am_phy = dev_get_drvdata(dev);
116
117	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
118
119	if (device_may_wakeup(dev))
120		phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
121
122	return 0;
123}
124#endif
125
126static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
127
128static const struct of_device_id am335x_phy_ids[] = {
129	{ .compatible = "ti,am335x-usb-phy" },
130	{ }
131};
132MODULE_DEVICE_TABLE(of, am335x_phy_ids);
133
134static struct platform_driver am335x_phy_driver = {
135	.probe          = am335x_phy_probe,
136	.remove_new     = am335x_phy_remove,
137	.driver         = {
138		.name   = "am335x-phy-driver",
139		.pm = &am335x_pm_ops,
140		.of_match_table = am335x_phy_ids,
141	},
142};
143
144module_platform_driver(am335x_phy_driver);
145MODULE_LICENSE("GPL v2");
146