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_gen_xceiv.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_gen_xceiv 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
126static const struct dev_pm_ops am335x_pm_ops = {
127	SET_SYSTEM_SLEEP_PM_OPS(am335x_phy_suspend, am335x_phy_resume)
128};
129
130#define DEV_PM_OPS     (&am335x_pm_ops)
131#else
132#define DEV_PM_OPS     NULL
133#endif
134
135static const struct of_device_id am335x_phy_ids[] = {
136	{ .compatible = "ti,am335x-usb-phy" },
137	{ }
138};
139MODULE_DEVICE_TABLE(of, am335x_phy_ids);
140
141static struct platform_driver am335x_phy_driver = {
142	.probe          = am335x_phy_probe,
143	.remove         = am335x_phy_remove,
144	.driver         = {
145		.name   = "am335x-phy-driver",
146		.owner  = THIS_MODULE,
147		.pm = DEV_PM_OPS,
148		.of_match_table = am335x_phy_ids,
149	},
150};
151
152module_platform_driver(am335x_phy_driver);
153MODULE_LICENSE("GPL v2");