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@xxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxx>
> + *
> + * 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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