mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
928c4bdf9b
Based on discussion from this thread [1]. Adding omap-view port that helps us in using the generic ulpi framework for any ulpi phy ops using the INSNREG05_ULPI viewport reg available on omap platform. Currently ehci ports are available on omap3/4 platforms so enable the same for beagle and panda, patch is tested on the same boards. Thanks to Igor Grinberg <grinberg@compulab.co.il> for reviewing the omap-ehci patches and suggesting this approach. [1]: http://www.mail-archive.com/u-boot@lists.denx.de/msg76076.html Tested-by: Stefano Babic <sbabic@denx.de> Acked-by: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
|
|
* 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;
|
|
}
|