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/*
* OMAP ulpi viewport support
* Based on drivers/usb/ulpi/ulpi-viewport.c
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
* Author: Govindraj R <govindraj.raja@ti.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <asm/io.h>
#include <usb/ulpi.h>
#define OMAP_ULPI_WR_OPSEL (3 << 21)
#define OMAP_ULPI_ACCESS (1 << 31)
/*
* Wait for the ULPI Access to complete
*/
static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
{
int timeout = CONFIG_USB_ULPI_TIMEOUT;
while (--timeout) {
if ((readl(ulpi_vp->viewport_addr) & mask))
return 0;
udelay(1);
}
return ULPI_ERROR;
}
/*
* Wake the ULPI PHY up for communication
*
* returns 0 on success.
*/
static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
{
int err;
if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS)
return 0; /* already awake */
writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr);
err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
if (err)
debug("ULPI wakeup timed out\n");
return err;
}
/*
* Issue a ULPI read/write request
*/
static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
{
int err;
err = ulpi_wakeup(ulpi_vp);
if (err)
return err;
writel(value, ulpi_vp->viewport_addr);
err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
if (err)
debug("ULPI request timed out\n");
return err;
}
int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
{
u32 val = ((ulpi_vp->port_num & 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 = ((ulpi_vp->port_num & 0xf) << 24) |
OMAP_ULPI_WR_OPSEL | ((u32)reg << 16);
err = ulpi_request(ulpi_vp, val);
if (err)
return err;
return readl(ulpi_vp->viewport_addr) & 0xff;
}
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