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/*
* Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
* Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Jana Rapava <fermata7@gmail.com>
* Igor Grinberg <grinberg@compulab.co.il>
*
* Based on:
* linux/drivers/usb/otg/ulpi_viewport.c
*
* Original Copyright follow:
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <asm/io.h>
#include <usb/ulpi.h>
/* ULPI viewport control bits */
#define ULPI_SS (1 << 27)
#define ULPI_RWCTRL (1 << 29)
#define ULPI_RWRUN (1 << 30)
#define ULPI_WU (1 << 31)
/*
* Wait for the ULPI request to complete
*
* @ulpi_viewport - the address of the viewport
* @mask - expected value to wait for
*
* returns 0 on mask match, ULPI_ERROR on time out.
*/
static int ulpi_wait(u32 ulpi_viewport, u32 mask)
{
int timeout = CONFIG_USB_ULPI_TIMEOUT;
/* Wait for the bits in mask to become zero. */
while (--timeout) {
if ((readl(ulpi_viewport) & mask) == 0)
return 0;
udelay(1);
}
return ULPI_ERROR;
}
/*
* Wake the ULPI PHY up for communication
*
* returns 0 on success.
*/
static int ulpi_wakeup(u32 ulpi_viewport)
{
int err;
if (readl(ulpi_viewport) & ULPI_SS)
return 0; /* already awake */
writel(ULPI_WU, ulpi_viewport);
err = ulpi_wait(ulpi_viewport, ULPI_WU);
if (err)
printf("ULPI wakeup timed out\n");
return err;
}
/*
* Issue a ULPI read/write request
*
* @value - the ULPI request
*/
static int ulpi_request(u32 ulpi_viewport, u32 value)
{
int err;
err = ulpi_wakeup(ulpi_viewport);
if (err)
return err;
writel(value, ulpi_viewport);
err = ulpi_wait(ulpi_viewport, ULPI_RWRUN);
if (err)
printf("ULPI request timed out\n");
return err;
}
u32 ulpi_write(u32 ulpi_viewport, u8 *reg, u32 value)
{
u32 val = ULPI_RWRUN | ULPI_RWCTRL | ((u32)reg << 16) | (value & 0xff);
return ulpi_request(ulpi_viewport, val);
}
u32 ulpi_read(u32 ulpi_viewport, u8 *reg)
{
u32 err;
u32 val = ULPI_RWRUN | ((u32)reg << 16);
err = ulpi_request(ulpi_viewport, val);
if (err)
return err;
return (readl(ulpi_viewport) >> 8) & 0xff;
}
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