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 <linux/usb/otg.h>
  8#include "phy-am335x-control.h"
  9
 10struct am335x_control_usb {
 11	struct device *dev;
 12	void __iomem *phy_reg;
 13	void __iomem *wkup;
 14	spinlock_t lock;
 15	struct phy_control phy_ctrl;
 16};
 17
 18#define AM335X_USB0_CTRL		0x0
 19#define AM335X_USB1_CTRL		0x8
 20#define AM335x_USB_WKUP			0x0
 21
 22#define USBPHY_CM_PWRDN		(1 << 0)
 23#define USBPHY_OTG_PWRDN	(1 << 1)
 24#define USBPHY_OTGVDET_EN	(1 << 19)
 25#define USBPHY_OTGSESSEND_EN	(1 << 20)
 26
 27#define AM335X_PHY0_WK_EN	(1 << 0)
 28#define AM335X_PHY1_WK_EN	(1 << 8)
 29
 30static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
 31{
 32	struct am335x_control_usb *usb_ctrl;
 33	u32 val;
 34	u32 reg;
 35
 36	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 37
 38	switch (id) {
 39	case 0:
 40		reg = AM335X_PHY0_WK_EN;
 41		break;
 42	case 1:
 43		reg = AM335X_PHY1_WK_EN;
 44		break;
 45	default:
 46		WARN_ON(1);
 47		return;
 48	}
 49
 50	spin_lock(&usb_ctrl->lock);
 51	val = readl(usb_ctrl->wkup);
 52
 53	if (on)
 54		val |= reg;
 55	else
 56		val &= ~reg;
 57
 58	writel(val, usb_ctrl->wkup);
 59	spin_unlock(&usb_ctrl->lock);
 60}
 61
 62static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
 63				enum usb_dr_mode dr_mode, bool on)
 64{
 65	struct am335x_control_usb *usb_ctrl;
 66	u32 val;
 67	u32 reg;
 68
 69	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 70
 71	switch (id) {
 72	case 0:
 73		reg = AM335X_USB0_CTRL;
 74		break;
 75	case 1:
 76		reg = AM335X_USB1_CTRL;
 77		break;
 78	default:
 79		WARN_ON(1);
 80		return;
 81	}
 82
 83	val = readl(usb_ctrl->phy_reg + reg);
 84	if (on) {
 85		if (dr_mode == USB_DR_MODE_HOST) {
 86			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
 87					USBPHY_OTGVDET_EN);
 88			val |= USBPHY_OTGSESSEND_EN;
 89		} else {
 90			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
 91			val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
 92		}
 93	} else {
 94		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 95	}
 96
 97	writel(val, usb_ctrl->phy_reg + reg);
 98
 99	/*
100	 * Give the PHY ~1ms to complete the power up operation.
101	 * Tests have shown unstable behaviour if other USB PHY related
102	 * registers are written too shortly after such a transition.
103	 */
104	if (on)
105		mdelay(1);
106}
107
108static const struct phy_control ctrl_am335x = {
109	.phy_power = am335x_phy_power,
110	.phy_wkup = am335x_phy_wkup,
111};
112
113static const struct of_device_id omap_control_usb_id_table[] = {
114	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
115	{}
116};
117MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
118
119static struct platform_driver am335x_control_driver;
120static int match(struct device *dev, void *data)
121{
122	struct device_node *node = (struct device_node *)data;
123	return dev->of_node == node &&
124		dev->driver == &am335x_control_driver.driver;
125}
126
127struct phy_control *am335x_get_phy_control(struct device *dev)
128{
129	struct device_node *node;
130	struct am335x_control_usb *ctrl_usb;
131
132	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
133	if (!node)
134		return NULL;
135
136	dev = bus_find_device(&platform_bus_type, NULL, node, match);
137	of_node_put(node);
138	if (!dev)
139		return NULL;
140
141	ctrl_usb = dev_get_drvdata(dev);
142	put_device(dev);
143	if (!ctrl_usb)
144		return NULL;
145	return &ctrl_usb->phy_ctrl;
146}
147EXPORT_SYMBOL_GPL(am335x_get_phy_control);
148
149static int am335x_control_usb_probe(struct platform_device *pdev)
150{
151	struct resource	*res;
152	struct am335x_control_usb *ctrl_usb;
153	const struct of_device_id *of_id;
154	const struct phy_control *phy_ctrl;
155
156	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
157	if (!of_id)
158		return -EINVAL;
159
160	phy_ctrl = of_id->data;
161
162	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
163	if (!ctrl_usb)
164		return -ENOMEM;
165
166	ctrl_usb->dev = &pdev->dev;
167
168	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
169	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
170	if (IS_ERR(ctrl_usb->phy_reg))
171		return PTR_ERR(ctrl_usb->phy_reg);
172
173	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
174	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
175	if (IS_ERR(ctrl_usb->wkup))
176		return PTR_ERR(ctrl_usb->wkup);
177
178	spin_lock_init(&ctrl_usb->lock);
179	ctrl_usb->phy_ctrl = *phy_ctrl;
180
181	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
182	return 0;
183}
184
185static struct platform_driver am335x_control_driver = {
186	.probe		= am335x_control_usb_probe,
187	.driver		= {
188		.name	= "am335x-control-usb",
189		.of_match_table = omap_control_usb_id_table,
190	},
191};
192
193module_platform_driver(am335x_control_driver);
194MODULE_LICENSE("GPL v2");