[deliverable/linux.git] / drivers / usb / phy / phy-am335x-control.c

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/usb/otg.h>
#include "phy-am335x-control.h"

struct am335x_control_usb {
	struct device *dev;
	void __iomem *phy_reg;
	void __iomem *wkup;
	spinlock_t lock;
	struct phy_control phy_ctrl;
};

#define AM335X_USB0_CTRL		0x0
#define AM335X_USB1_CTRL		0x8
#define AM335x_USB_WKUP			0x0

#define USBPHY_CM_PWRDN		(1 << 0)
#define USBPHY_OTG_PWRDN	(1 << 1)
#define USBPHY_OTGVDET_EN	(1 << 19)
#define USBPHY_OTGSESSEND_EN	(1 << 20)

#define AM335X_PHY0_WK_EN	(1 << 0)
#define AM335X_PHY1_WK_EN	(1 << 8)

static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
{
	struct am335x_control_usb *usb_ctrl;
	u32 val;
	u32 reg;

	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);

	switch (id) {
	case 0:
		reg = AM335X_PHY0_WK_EN;
		break;
	case 1:
		reg = AM335X_PHY1_WK_EN;
		break;
	default:
		WARN_ON(1);
		return;
	}

	spin_lock(&usb_ctrl->lock);
	val = readl(usb_ctrl->wkup);

	if (on)
		val |= reg;
	else
		val &= ~reg;

	writel(val, usb_ctrl->wkup);
	spin_unlock(&usb_ctrl->lock);
}

static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
				enum usb_dr_mode dr_mode, bool on)
{
	struct am335x_control_usb *usb_ctrl;
	u32 val;
	u32 reg;

	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);

	switch (id) {
	case 0:
		reg = AM335X_USB0_CTRL;
		break;
	case 1:
		reg = AM335X_USB1_CTRL;
		break;
	default:
		WARN_ON(1);
		return;
	}

	val = readl(usb_ctrl->phy_reg + reg);
	if (on) {
		if (dr_mode == USB_DR_MODE_HOST) {
			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
					USBPHY_OTGVDET_EN);
			val |= USBPHY_OTGSESSEND_EN;
		} else {
			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
			val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
		}
	} else {
		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
	}

	writel(val, usb_ctrl->phy_reg + reg);

	/*
	 * Give the PHY ~1ms to complete the power up operation.
	 * Tests have shown unstable behaviour if other USB PHY related
	 * registers are written too shortly after such a transition.
	 */
	if (on)
		mdelay(1);
}

static const struct phy_control ctrl_am335x = {
	.phy_power = am335x_phy_power,
	.phy_wkup = am335x_phy_wkup,
};

static const struct of_device_id omap_control_usb_id_table[] = {
	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
	{}
};
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);

static struct platform_driver am335x_control_driver;
static int match(struct device *dev, void *data)
{
	struct device_node *node = (struct device_node *)data;
	return dev->of_node == node &&
		dev->driver == &am335x_control_driver.driver;
}

struct phy_control *am335x_get_phy_control(struct device *dev)
{
	struct device_node *node;
	struct am335x_control_usb *ctrl_usb;

	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
	if (!node)
		return NULL;

	dev = bus_find_device(&platform_bus_type, NULL, node, match);
	if (!dev)
		return NULL;

	ctrl_usb = dev_get_drvdata(dev);
	if (!ctrl_usb)
		return NULL;
	return &ctrl_usb->phy_ctrl;
}
EXPORT_SYMBOL_GPL(am335x_get_phy_control);

static int am335x_control_usb_probe(struct platform_device *pdev)
{
	struct resource	*res;
	struct am335x_control_usb *ctrl_usb;
	const struct of_device_id *of_id;
	const struct phy_control *phy_ctrl;

	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
	if (!of_id)
		return -EINVAL;

	phy_ctrl = of_id->data;

	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
	if (!ctrl_usb)
		return -ENOMEM;

	ctrl_usb->dev = &pdev->dev;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ctrl_usb->phy_reg))
		return PTR_ERR(ctrl_usb->phy_reg);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ctrl_usb->wkup))
		return PTR_ERR(ctrl_usb->wkup);

	spin_lock_init(&ctrl_usb->lock);
	ctrl_usb->phy_ctrl = *phy_ctrl;

	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
	return 0;
}

static struct platform_driver am335x_control_driver = {
	.probe		= am335x_control_usb_probe,
	.driver		= {
		.name	= "am335x-control-usb",
		.of_match_table = omap_control_usb_id_table,
	},
};

module_platform_driver(am335x_control_driver);
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3bb869c8 SAS	1	#include <linux/module.h>
3bb869c8 SAS	2	#include <linux/platform_device.h>
8b841cb2	3	#include <linux/err.h>
3bb869c8 SAS	4	#include <linux/of.h>
3bb869c8 SAS	5	#include <linux/io.h>
a31a942a	6	#include <linux/delay.h>
59f042f6	7	#include <linux/usb/otg.h>
5306661e	8	#include "phy-am335x-control.h"
3bb869c8 SAS	9
	10	struct 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
a1222639 SAS	27	#define AM335X_PHY0_WK_EN (1 << 0)
	28	#define AM335X_PHY1_WK_EN (1 << 8)
	29
	30	static 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
59f042f6 BL	62	static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
59f042f6 BL	63	enum usb_dr_mode dr_mode, bool on)
3bb869c8 SAS	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:
4ff74571 SAS	79	WARN_ON(1);
4ff74571 SAS	80	return;
3bb869c8 SAS	81	}
	82
	83	val = readl(usb_ctrl->phy_reg + reg);
	84	if (on) {
59f042f6 BL	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	}
3bb869c8 SAS	93	} else {
	94	val \|= USBPHY_CM_PWRDN \| USBPHY_OTG_PWRDN;
	95	}
	96
	97	writel(val, usb_ctrl->phy_reg + reg);
a31a942a DM	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);
3bb869c8 SAS	106	}
	107
	108	static const struct phy_control ctrl_am335x = {
	109	.phy_power = am335x_phy_power,
a1222639	110	.phy_wkup = am335x_phy_wkup,
3bb869c8 SAS	111	};
	112
	113	static const struct of_device_id omap_control_usb_id_table[] = {
	114	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
	115	{}
	116	};
	117	MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
	118
	119	static struct platform_driver am335x_control_driver;
	120	static 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
	127	struct 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);
d0f347d6 DD	137	if (!dev)
	138	return NULL;
	139
3bb869c8 SAS	140	ctrl_usb = dev_get_drvdata(dev);
	141	if (!ctrl_usb)
	142	return NULL;
	143	return &ctrl_usb->phy_ctrl;
	144	}
	145	EXPORT_SYMBOL_GPL(am335x_get_phy_control);
	146
	147	static int am335x_control_usb_probe(struct platform_device *pdev)
	148	{
	149	struct resource *res;
	150	struct am335x_control_usb *ctrl_usb;
	151	const struct of_device_id *of_id;
	152	const struct phy_control *phy_ctrl;
	153
	154	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
	155	if (!of_id)
	156	return -EINVAL;
	157
	158	phy_ctrl = of_id->data;
	159
	160	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
9aabd032	161	if (!ctrl_usb)
3bb869c8	162	return -ENOMEM;
3bb869c8 SAS	163
	164	ctrl_usb->dev = &pdev->dev;
	165
	166	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
	167	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
	168	if (IS_ERR(ctrl_usb->phy_reg))
	169	return PTR_ERR(ctrl_usb->phy_reg);
a1222639 SAS	170
	171	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
	172	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
	173	if (IS_ERR(ctrl_usb->wkup))
	174	return PTR_ERR(ctrl_usb->wkup);
	175
3bb869c8 SAS	176	spin_lock_init(&ctrl_usb->lock);
	177	ctrl_usb->phy_ctrl = *phy_ctrl;
	178
	179	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
	180	return 0;
	181	}
	182
	183	static struct platform_driver am335x_control_driver = {
	184	.probe = am335x_control_usb_probe,
	185	.driver = {
	186	.name = "am335x-control-usb",
c4df9ae0	187	.of_match_table = omap_control_usb_id_table,
3bb869c8 SAS	188	},
	189	};
	190
	191	module_platform_driver(am335x_control_driver);
	192	MODULE_LICENSE("GPL v2");