Release 4.16 drivers/usb/phy/phy-ulpi-viewport.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2011 Google, Inc.
 */

#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/io.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>


#define ULPI_VIEW_WAKEUP	(1 << 31)

#define ULPI_VIEW_RUN		(1 << 30)

#define ULPI_VIEW_WRITE		(1 << 29)

#define ULPI_VIEW_READ		(0 << 29)

#define ULPI_VIEW_ADDR(x)	(((x) & 0xff) << 16)

#define ULPI_VIEW_DATA_READ(x)	(((x) >> 8) & 0xff)

#define ULPI_VIEW_DATA_WRITE(x)	((x) & 0xff)



static int ulpi_viewport_wait(void __iomem *view, u32 mask)
{
	unsigned long usec = 2000;

	while (usec--) {
		if (!(readl(view) & mask))
			return 0;

		udelay(1);
	}

	return -ETIMEDOUT;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benoit Goby
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%



static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
{
	int ret;
	void __iomem *view = otg->io_priv;

	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
	if (ret)
		return ret;

	writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
	ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN);
	if (ret)
		return ret;

	return ULPI_VIEW_DATA_READ(readl(view));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benoit Goby
89
98.89%
1
50.00%
Heikki Krogerus
1
1.11%
1
50.00%
Total
90
100.00%
2
100.00%



static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg)
{
	int ret;
	void __iomem *view = otg->io_priv;

	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
	if (ret)
		return ret;

	writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
						 ULPI_VIEW_ADDR(reg), view);

	return ulpi_viewport_wait(view, ULPI_VIEW_RUN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benoit Goby
80
98.77%
1
50.00%
Heikki Krogerus
1
1.23%
1
50.00%
Total
81
100.00%
2
100.00%


struct usb_phy_io_ops ulpi_viewport_access_ops = {
	.read	= ulpi_viewport_read,
	.write	= ulpi_viewport_write,
};
EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Benoit Goby
287
95.67%
1
16.67%
Manjunath Goudar
8
2.67%
1
16.67%
Heikki Krogerus
3
1.00%
2
33.33%
Greg Kroah-Hartman
2
0.67%
2
33.33%
Total
300
100.00%
6
100.00%
Directory: drivers/usb/phy

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.