[PATCH 1/1] arm: add debug_ll support

[Sascha Hauer]

The subject is wrong, it's not 'arm:', but 'ARM at91:'

Sascha

On Sat, Jul 28, 2012 at 06:36:57AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> Today we only use the DBGU port
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  arch/arm/Kconfig                           |    1 +
>  arch/arm/mach-at91/include/mach/debug_ll.h |   37 ++++++++++++++++++++++++++++
>  2 files changed, 38 insertions(+)
>  create mode 100644 arch/arm/mach-at91/include/mach/debug_ll.h
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 245bec8..a7f1bfb 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -25,6 +25,7 @@ config ARCH_AT91
>  	bool "Atmel AT91"
>  	select GENERIC_GPIO
>  	select CLKDEV_LOOKUP
> +	select HAS_DEBUG_LL
>  
>  config ARCH_EP93XX
>  	bool "Cirrus Logic EP93xx"
> diff --git a/arch/arm/mach-at91/include/mach/debug_ll.h b/arch/arm/mach-at91/include/mach/debug_ll.h
> new file mode 100644
> index 0000000..ee824cb
> --- /dev/null
> +++ b/arch/arm/mach-at91/include/mach/debug_ll.h
> @@ -0,0 +1,37 @@
> +/*
> + * Copyright (C) 2012
> + * Jean-Christophe PLAGNIOL-VILLARD <planioj at 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
> -- 
> 1.7.10.4
> 
> 
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> 

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