1#include <linux/module.h>
2#include <linux/platform_device.h>
3#include <linux/dma-mapping.h>
4#include <linux/usb/otg.h>
5#include <linux/usb/usb_phy_generic.h>
6#include <linux/slab.h>
7#include <linux/clk.h>
8#include <linux/regulator/consumer.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11
12#include "am35x-phy-control.h"
13#include "phy-generic.h"
14
15struct am335x_phy {
16	struct usb_phy_generic usb_phy_gen;
17	struct phy_control *phy_ctrl;
18	int id;
19};
20
21static int am335x_init(struct usb_phy *phy)
22{
23	struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
24
25	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
26	return 0;
27}
28
29static void am335x_shutdown(struct usb_phy *phy)
30{
31	struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
32
33	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
34}
35
36static int am335x_phy_probe(struct platform_device *pdev)
37{
38	struct am335x_phy *am_phy;
39	struct device *dev = &pdev->dev;
40	int ret;
41
42	am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
43	if (!am_phy)
44		return -ENOMEM;
45
46	am_phy->phy_ctrl = am335x_get_phy_control(dev);
47	if (!am_phy->phy_ctrl)
48		return -EPROBE_DEFER;
49	am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
50	if (am_phy->id < 0) {
51		dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
52		return am_phy->id;
53	}
54
55	ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
56	if (ret)
57		return ret;
58
59	ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
60	if (ret)
61		return ret;
62	am_phy->usb_phy_gen.phy.init = am335x_init;
63	am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
64
65	platform_set_drvdata(pdev, am_phy);
66	device_init_wakeup(dev, true);
67
68	/*
69	 * If we leave PHY wakeup enabled then AM33XX wakes up
70	 * immediately from DS0. To avoid this we mark dev->power.can_wakeup
71	 * to false. The same is checked in suspend routine to decide
72	 * on whether to enable PHY wakeup or not.
73	 * PHY wakeup works fine in standby mode, there by allowing us to
74	 * handle remote wakeup, wakeup on disconnect and connect.
75	 */
76
77	device_set_wakeup_enable(dev, false);
78	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
79
80	return 0;
81}
82
83static int am335x_phy_remove(struct platform_device *pdev)
84{
85	struct am335x_phy *am_phy = platform_get_drvdata(pdev);
86
87	usb_remove_phy(&am_phy->usb_phy_gen.phy);
88	return 0;
89}
90
91#ifdef CONFIG_PM_SLEEP
92static int am335x_phy_suspend(struct device *dev)
93{
94	struct platform_device	*pdev = to_platform_device(dev);
95	struct am335x_phy *am_phy = platform_get_drvdata(pdev);
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, false);
109
110	return 0;
111}
112
113static int am335x_phy_resume(struct device *dev)
114{
115	struct platform_device	*pdev = to_platform_device(dev);
116	struct am335x_phy	*am_phy = platform_get_drvdata(pdev);
117
118	phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, 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