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tegra: Add support for UART init in cpu board.c

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We add a way of initialising the selected of UARTs prior to relocation.
Boards can use the board_init_uart_f() instead of repeating this code
themselves.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2011-11-28 15:04:39 +00:00 committed by Albert ARIBAUD
parent b5a5b35197
commit bb6997f840
2 changed files with 81 additions and 0 deletions
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51
arch/arm/cpu/armv7/tegra2/board.c
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@ -24,12 +24,22 @@
#include <common.h>
#include <asm/io.h>
#include "ap20.h"
#include <asm/arch/clock.h>
#include <asm/arch/funcmux.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/tegra2.h>
#include <asm/arch/pmc.h>
DECLARE_GLOBAL_DATA_PTR;
enum {
/* UARTs which we can enable */
UARTA = 1 << 0,
UARTB = 1 << 1,
UARTD = 1 << 3,
UART_COUNT = 4,
};
/*
* Boot ROM initializes the odmdata in APBDEV_PMC_SCRATCH20_0,
* so we are using this value to identify memory size.
@ -90,3 +100,44 @@ int arch_cpu_init(void)
return 0;
}
#endif
/**
* Set up the specified uarts
*
* @param uarts_ids Mask containing UARTs to init (UARTx)
*/
static void setup_uarts(int uart_ids)
{
static enum periph_id id_for_uart[] = {
PERIPH_ID_UART1,
PERIPH_ID_UART2,
PERIPH_ID_UART3,
PERIPH_ID_UART4,
};
size_t i;
for (i = 0; i < UART_COUNT; i++) {
if (uart_ids & (1 << i)) {
enum periph_id id = id_for_uart[i];
funcmux_select(id, 0);
clock_ll_start_uart(id);
}
}
}
void board_init_uart_f(void)
{
int uart_ids = 0; /* bit mask of which UART ids to enable */
#ifdef CONFIG_TEGRA2_ENABLE_UARTA
uart_ids |= UARTA;
#endif
#ifdef CONFIG_TEGRA2_ENABLE_UARTB
uart_ids |= UARTB;
#endif
#ifdef CONFIG_TEGRA2_ENABLE_UARTD
uart_ids |= UARTD;
#endif
setup_uarts(uart_ids);
}

30
arch/arm/include/asm/arch-tegra2/board.h Normal file
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@ -0,0 +1,30 @@
/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.com>
*
* 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 _TEGRA_BOARD_H_
#define _TEGRA_BOARD_H_
/* Setup UARTs for the board according to the selected config */
void board_init_uart_f(void);
#endif