[thirdparty/u-boot.git] / drivers / usb / ulpi / omap-ulpi-viewport.c

// SPDX-License-Identifier: GPL-2.0
/*
 * OMAP ulpi viewport support
 * Based on drivers/usb/ulpi/ulpi-viewport.c
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
 * Author: Govindraj R <govindraj.raja@ti.com>
 */

#include <common.h>
#include <log.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <usb/ulpi.h>

#define OMAP_ULPI_WR_OPSEL	(2 << 22)
#define OMAP_ULPI_RD_OPSEL	(3 << 22)
#define OMAP_ULPI_START		(1 << 31)

/*
 * Wait for having ulpi in done state
 */
static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
{
	int timeout = CFG_USB_ULPI_TIMEOUT;

	while (--timeout) {
		if (!(readl(ulpi_vp->viewport_addr) & mask))
			return 0;

		udelay(1);
	}

	return ULPI_ERROR;
}

/*
 * Issue a ULPI read/write request
 */
static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
{
	int err;

	writel(value, ulpi_vp->viewport_addr);

	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
	if (err)
		debug("ULPI request timed out\n");

	return err;
}

int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
{
	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
			OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);

	return ulpi_request(ulpi_vp, val);
}

u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
{
	int err;
	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
			 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);

	err = ulpi_request(ulpi_vp, val);
	if (err)
		return err;

	return readl(ulpi_vp->viewport_addr) & 0xff;
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0
928c4bdf G	2	/*
	3	* OMAP ulpi viewport support
	4	* Based on drivers/usb/ulpi/ulpi-viewport.c
	5	*
a94a4071	6	* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
928c4bdf	7	* Author: Govindraj R <govindraj.raja@ti.com>
928c4bdf G	8	*/
928c4bdf G	9
d678a59d	10	#include <common.h>
f7ae49fc	11	#include <log.h>
928c4bdf	12	#include <asm/io.h>
c05ed00a	13	#include <linux/delay.h>
928c4bdf G	14	#include <usb/ulpi.h>
928c4bdf G	15
b0857c45 MT	16	#define OMAP_ULPI_WR_OPSEL (2 << 22)
	17	#define OMAP_ULPI_RD_OPSEL (3 << 22)
	18	#define OMAP_ULPI_START (1 << 31)
928c4bdf G	19
928c4bdf G	20	/*
b0857c45	21	* Wait for having ulpi in done state
928c4bdf G	22	*/
	23	static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
	24	{
6e7df1d1	25	int timeout = CFG_USB_ULPI_TIMEOUT;
928c4bdf G	26
928c4bdf G	27	while (--timeout) {
b0857c45	28	if (!(readl(ulpi_vp->viewport_addr) & mask))
928c4bdf G	29	return 0;
	30
	31	udelay(1);
	32	}
	33
	34	return ULPI_ERROR;
	35	}
	36
928c4bdf G	37	/*
	38	* Issue a ULPI read/write request
	39	*/
	40	static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
	41	{
	42	int err;
	43
928c4bdf G	44	writel(value, ulpi_vp->viewport_addr);
928c4bdf G	45
b0857c45	46	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
928c4bdf G	47	if (err)
	48	debug("ULPI request timed out\n");
	49
	50	return err;
	51	}
	52
	53	int ulpi_write(struct ulpi_viewport ulpi_vp, u8 reg, u32 value)
	54	{
b0857c45	55	u32 val = OMAP_ULPI_START \| (((ulpi_vp->port_num + 1) & 0xf) << 24) \|
928c4bdf G	56	OMAP_ULPI_WR_OPSEL \| ((u32)reg << 16) \| (value & 0xff);
	57
	58	return ulpi_request(ulpi_vp, val);
	59	}
	60
	61	u32 ulpi_read(struct ulpi_viewport ulpi_vp, u8 reg)
	62	{
	63	int err;
b0857c45 MT	64	u32 val = OMAP_ULPI_START \| (((ulpi_vp->port_num + 1) & 0xf) << 24) \|
b0857c45 MT	65	OMAP_ULPI_RD_OPSEL \| ((u32)reg << 16);
928c4bdf G	66
	67	err = ulpi_request(ulpi_vp, val);
	68	if (err)
	69	return err;
	70
	71	return readl(ulpi_vp->viewport_addr) & 0xff;
	72	}