mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 17:38:51 +09:00
![Allen Martin](/assets/img/avatar_default.png)
This is make naming consistent with the kernel and devicetree and in preparation of pulling out the common tegra20 code. Signed-off-by: Allen Martin <amartin@nvidia.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Tom Warren <twarren@nvidia.com>
126 lines
3.2 KiB
C
126 lines
3.2 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
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/arch/pinmux.h>
|
|
#include <asm/arch/uart-spi-switch.h>
|
|
#include <asm/arch/tegra20.h>
|
|
#include <asm/arch/tegra_spi.h>
|
|
|
|
|
|
/* position of the UART/SPI select switch */
|
|
enum spi_uart_switch {
|
|
SWITCH_UNKNOWN,
|
|
SWITCH_SPI,
|
|
SWITCH_UART,
|
|
SWITCH_BOTH
|
|
};
|
|
|
|
/* Information about the spi/uart switch */
|
|
struct spi_uart {
|
|
int gpio; /* GPIO to control switch */
|
|
u32 port; /* Port number of UART affected */
|
|
};
|
|
|
|
static struct spi_uart local;
|
|
static enum spi_uart_switch switch_pos; /* Current switch position */
|
|
|
|
|
|
static void get_config(struct spi_uart *config)
|
|
{
|
|
#if defined CONFIG_SPI_CORRUPTS_UART
|
|
config->gpio = CONFIG_UART_DISABLE_GPIO;
|
|
config->port = CONFIG_SPI_CORRUPTS_UART_NR;
|
|
#else
|
|
config->gpio = -1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Init the UART / SPI switch. This can be called before relocation so we must
|
|
* not access BSS.
|
|
*/
|
|
void gpio_early_init_uart(void)
|
|
{
|
|
struct spi_uart config;
|
|
|
|
get_config(&config);
|
|
if (config.gpio != -1) {
|
|
/* Cannot provide a label prior to relocation */
|
|
gpio_request(config.gpio, NULL);
|
|
gpio_direction_output(config.gpio, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Configure the UART / SPI switch.
|
|
*/
|
|
void gpio_config_uart(void)
|
|
{
|
|
get_config(&local);
|
|
if (local.gpio != -1) {
|
|
gpio_direction_output(local.gpio, 0);
|
|
switch_pos = SWITCH_UART;
|
|
} else {
|
|
/*
|
|
* If we're here we don't have a SPI switch; go ahead and
|
|
* enable the SPI now. We didn't in spi_init() so we wouldn't
|
|
* kill the UART.
|
|
*/
|
|
pinmux_set_func(PINGRP_GMC, PMUX_FUNC_SFLASH);
|
|
switch_pos = SWITCH_BOTH;
|
|
}
|
|
}
|
|
|
|
static void spi_uart_switch(struct spi_uart *config,
|
|
enum spi_uart_switch new_pos)
|
|
{
|
|
if (switch_pos == SWITCH_BOTH || new_pos == switch_pos)
|
|
return;
|
|
|
|
/* pre-delay, allow SPI/UART to settle, FIFO to empty, etc. */
|
|
udelay(CONFIG_SPI_CORRUPTS_UART_DLY);
|
|
|
|
/* We need to dynamically change the pinmux, shared w/UART RXD/CTS */
|
|
pinmux_set_func(PINGRP_GMC, new_pos == SWITCH_SPI ?
|
|
PMUX_FUNC_SFLASH : PMUX_FUNC_UARTD);
|
|
|
|
/*
|
|
* On Seaboard, MOSI/MISO are shared w/UART.
|
|
* Use GPIO I3 (UART_DISABLE) to tristate UART during SPI activity.
|
|
* Enable UART later (cs_deactivate) so we can use it for U-Boot comms.
|
|
*/
|
|
gpio_direction_output(config->gpio, new_pos == SWITCH_SPI);
|
|
switch_pos = new_pos;
|
|
}
|
|
|
|
void pinmux_select_uart(void)
|
|
{
|
|
spi_uart_switch(&local, SWITCH_UART);
|
|
}
|
|
|
|
void pinmux_select_spi(void)
|
|
{
|
|
spi_uart_switch(&local, SWITCH_SPI);
|
|
}
|