1#include <linux/module.h>
  2#include <linux/platform_device.h>
  3#include <linux/err.h>
  4#include <linux/of.h>
  5#include <linux/io.h>
  6#include <linux/delay.h>
  7#include "am35x-phy-control.h"
  8
  9struct am335x_control_usb {
 10	struct device *dev;
 11	void __iomem *phy_reg;
 12	void __iomem *wkup;
 13	spinlock_t lock;
 14	struct phy_control phy_ctrl;
 15};
 16
 17#define AM335X_USB0_CTRL		0x0
 18#define AM335X_USB1_CTRL		0x8
 19#define AM335x_USB_WKUP			0x0
 20
 21#define USBPHY_CM_PWRDN		(1 << 0)
 22#define USBPHY_OTG_PWRDN	(1 << 1)
 23#define USBPHY_OTGVDET_EN	(1 << 19)
 24#define USBPHY_OTGSESSEND_EN	(1 << 20)
 25
 26#define AM335X_PHY0_WK_EN	(1 << 0)
 27#define AM335X_PHY1_WK_EN	(1 << 8)
 28
 29static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
 30{
 31	struct am335x_control_usb *usb_ctrl;
 32	u32 val;
 33	u32 reg;
 34
 35	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 36
 37	switch (id) {
 38	case 0:
 39		reg = AM335X_PHY0_WK_EN;
 40		break;
 41	case 1:
 42		reg = AM335X_PHY1_WK_EN;
 43		break;
 44	default:
 45		WARN_ON(1);
 46		return;
 47	}
 48
 49	spin_lock(&usb_ctrl->lock);
 50	val = readl(usb_ctrl->wkup);
 51
 52	if (on)
 53		val |= reg;
 54	else
 55		val &= ~reg;
 56
 57	writel(val, usb_ctrl->wkup);
 58	spin_unlock(&usb_ctrl->lock);
 59}
 60
 61static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
 62{
 63	struct am335x_control_usb *usb_ctrl;
 64	u32 val;
 65	u32 reg;
 66
 67	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 68
 69	switch (id) {
 70	case 0:
 71		reg = AM335X_USB0_CTRL;
 72		break;
 73	case 1:
 74		reg = AM335X_USB1_CTRL;
 75		break;
 76	default:
 77		WARN_ON(1);
 78		return;
 79	}
 80
 81	val = readl(usb_ctrl->phy_reg + reg);
 82	if (on) {
 83		val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
 84		val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
 85	} else {
 86		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 87	}
 88
 89	writel(val, usb_ctrl->phy_reg + reg);
 90
 91	/*
 92	 * Give the PHY ~1ms to complete the power up operation.
 93	 * Tests have shown unstable behaviour if other USB PHY related
 94	 * registers are written too shortly after such a transition.
 95	 */
 96	if (on)
 97		mdelay(1);
 98}
 99
100static const struct phy_control ctrl_am335x = {
101	.phy_power = am335x_phy_power,
102	.phy_wkup = am335x_phy_wkup,
103};
104
105static const struct of_device_id omap_control_usb_id_table[] = {
106	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
107	{}
108};
109MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
110
111static struct platform_driver am335x_control_driver;
112static int match(struct device *dev, void *data)
113{
114	struct device_node *node = (struct device_node *)data;
115	return dev->of_node == node &&
116		dev->driver == &am335x_control_driver.driver;
117}
118
119struct phy_control *am335x_get_phy_control(struct device *dev)
120{
121	struct device_node *node;
122	struct am335x_control_usb *ctrl_usb;
123
124	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
125	if (!node)
126		return NULL;
127
128	dev = bus_find_device(&platform_bus_type, NULL, node, match);
129	ctrl_usb = dev_get_drvdata(dev);
130	if (!ctrl_usb)
131		return NULL;
132	return &ctrl_usb->phy_ctrl;
133}
134EXPORT_SYMBOL_GPL(am335x_get_phy_control);
135
136static int am335x_control_usb_probe(struct platform_device *pdev)
137{
138	struct resource	*res;
139	struct am335x_control_usb *ctrl_usb;
140	const struct of_device_id *of_id;
141	const struct phy_control *phy_ctrl;
142
143	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
144	if (!of_id)
145		return -EINVAL;
146
147	phy_ctrl = of_id->data;
148
149	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
150	if (!ctrl_usb) {
151		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
152		return -ENOMEM;
153	}
154
155	ctrl_usb->dev = &pdev->dev;
156
157	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
158	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
159	if (IS_ERR(ctrl_usb->phy_reg))
160		return PTR_ERR(ctrl_usb->phy_reg);
161
162	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
163	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
164	if (IS_ERR(ctrl_usb->wkup))
165		return PTR_ERR(ctrl_usb->wkup);
166
167	spin_lock_init(&ctrl_usb->lock);
168	ctrl_usb->phy_ctrl = *phy_ctrl;
169
170	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
171	return 0;
172}
173
174static struct platform_driver am335x_control_driver = {
175	.probe		= am335x_control_usb_probe,
176	.driver		= {
177		.name	= "am335x-control-usb",
178		.owner	= THIS_MODULE,
179		.of_match_table = omap_control_usb_id_table,
180	},
181};
182
183module_platform_driver(am335x_control_driver);
184MODULE_LICENSE("GPL v2");