[mirror_ubuntu-bionic-kernel.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 "am35x-phy-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, 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) {
		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>
db67bc04	7	#include "am35x-phy-control.h"
3bb869c8 SAS	8
	9	struct 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
a1222639 SAS	26	#define AM335X_PHY0_WK_EN (1 << 0)
	27	#define AM335X_PHY1_WK_EN (1 << 8)
	28
	29	static 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
3bb869c8 SAS	61	static 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:
4ff74571 SAS	77	WARN_ON(1);
4ff74571 SAS	78	return;
3bb869c8 SAS	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);
a31a942a DM	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);
3bb869c8 SAS	98	}
	99
	100	static const struct phy_control ctrl_am335x = {
	101	.phy_power = am335x_phy_power,
a1222639	102	.phy_wkup = am335x_phy_wkup,
3bb869c8 SAS	103	};
	104
	105	static const struct of_device_id omap_control_usb_id_table[] = {
	106	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
	107	{}
	108	};
	109	MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
	110
	111	static struct platform_driver am335x_control_driver;
	112	static 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
	119	struct 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);
d0f347d6 DD	129	if (!dev)
	130	return NULL;
	131
3bb869c8 SAS	132	ctrl_usb = dev_get_drvdata(dev);
	133	if (!ctrl_usb)
	134	return NULL;
	135	return &ctrl_usb->phy_ctrl;
	136	}
	137	EXPORT_SYMBOL_GPL(am335x_get_phy_control);
	138
	139	static int am335x_control_usb_probe(struct platform_device *pdev)
	140	{
	141	struct resource *res;
	142	struct am335x_control_usb *ctrl_usb;
	143	const struct of_device_id *of_id;
	144	const struct phy_control *phy_ctrl;
	145
	146	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
	147	if (!of_id)
	148	return -EINVAL;
	149
	150	phy_ctrl = of_id->data;
	151
	152	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
9aabd032	153	if (!ctrl_usb)
3bb869c8	154	return -ENOMEM;
3bb869c8 SAS	155
	156	ctrl_usb->dev = &pdev->dev;
	157
	158	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
	159	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
	160	if (IS_ERR(ctrl_usb->phy_reg))
	161	return PTR_ERR(ctrl_usb->phy_reg);
a1222639 SAS	162
	163	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
	164	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
	165	if (IS_ERR(ctrl_usb->wkup))
	166	return PTR_ERR(ctrl_usb->wkup);
	167
3bb869c8 SAS	168	spin_lock_init(&ctrl_usb->lock);
	169	ctrl_usb->phy_ctrl = *phy_ctrl;
	170
	171	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
	172	return 0;
	173	}
	174
	175	static struct platform_driver am335x_control_driver = {
	176	.probe = am335x_control_usb_probe,
	177	.driver = {
	178	.name = "am335x-control-usb",
c4df9ae0	179	.of_match_table = omap_control_usb_id_table,
3bb869c8 SAS	180	},
	181	};
	182
	183	module_platform_driver(am335x_control_driver);
	184	MODULE_LICENSE("GPL v2");