u-boot/arch/arm/include/asm/arch-tegra2/uart-spi-switch.h
Tom Warren 078078cfa9 spi: Tegra2: Seaboard: fix UART corruption during SPI transactions
Simon Glass's proposal to fix this on Seaboard was NAK'd, so I
removed his NS16550 references and added a small delay before
SPI/UART muxing. Tested on my Seaboard with large SPI reads/writes
and saw no corruption (crc's matched) and no spurious comm chars.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Jimmy Zhang <jimmzhang@nvidia.com>
2012-07-07 14:07:17 +02:00

46 lines
1.4 KiB
C

/*
* Copyright (c) 2011 The Chromium OS Authors.
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _UART_SPI_SWITCH_H
#define _UART_SPI_SWITCH_H
#if defined(CONFIG_SPI_UART_SWITCH)
/*
* Signal that we are about to use the UART. This unfortunate hack is
* required by Seaboard, which cannot use its console and SPI at the same
* time! If the board file provides this, the board config will declare it.
* Let this be a lesson for others.
*/
void pinmux_select_uart(void);
/*
* Signal that we are about the use the SPI bus.
*/
void pinmux_select_spi(void);
#else /* not CONFIG_SPI_UART_SWITCH */
static inline void pinmux_select_uart(void) {}
static inline void pinmux_select_spi(void) {}
#endif
#endif