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arm: at91: add debug_ll support 

Today we only use the DBGU port

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-08-03 07:59:51 +02:00 committed by Sascha Hauer
parent 21ea2ad830
commit b6240f08fb
2 changed files with 38 additions and 0 deletions
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1
arch/arm/Kconfig
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@ -23,6 +23,7 @@ config ARCH_AT91
bool "Atmel AT91"
select GENERIC_GPIO
select CLKDEV_LOOKUP
select HAS_DEBUG_LL
config ARCH_EP93XX
bool "Cirrus Logic EP93xx"

37
arch/arm/mach-at91/include/mach/debug_ll.h Normal file
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@ -0,0 +1,37 @@
/*
* Copyright (C) 2012
* Jean-Christophe PLAGNIOL-VILLARD <planioj@jcrosoft.com>
*
* Under GPLv2
*/
#ifndef __MACH_DEBUG_LL_H__
#define __MACH_DEBUG_LL_H__
#include <asm/io.h>
#include <mach/hardware.h>
#define UART_BASE (AT91_BASE_SYS + AT91_DBGU)
#define ATMEL_US_CSR 0x0014
#define ATMEL_US_THR 0x001c
#define ATMEL_US_TXRDY (1 << 1)
#define ATMEL_US_TXEMPTY (1 << 9)
/*
* The following code assumes the serial port has already been
* initialized by the bootloader. If you didn't setup a port in
* your bootloader then nothing will appear (which might be desired).
*
* This does not append a newline
*/
static void putc(int c)
{
while (!(__raw_readl(UART_BASE + ATMEL_US_CSR) & ATMEL_US_TXRDY))
barrier();
__raw_writel(c, UART_BASE + ATMEL_US_THR);
while (!(__raw_readl(UART_BASE + ATMEL_US_CSR) & ATMEL_US_TXEMPTY))
barrier();
}
#endif