On Sun, Sep 28, 2014 at 8:33 PM, Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx> wrote:
> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
> ---
> arch/mips/Kconfig | 1 +
> arch/mips/ar231x/Makefile | 2 ++
> arch/mips/ar231x/early_printk.c | 45 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 48 insertions(+)
> create mode 100644 arch/mips/ar231x/early_printk.c
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index bd81f7a..b89bfdf 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -83,6 +83,7 @@ config AR231X
> select SYS_SUPPORTS_BIG_ENDIAN
> select SYS_SUPPORTS_32BIT_KERNEL
> select ARCH_REQUIRE_GPIOLIB
> + select SYS_HAS_EARLY_PRINTK
> help
> Support for Atheros AR231x and Atheros AR531x based boards
>
> diff --git a/arch/mips/ar231x/Makefile b/arch/mips/ar231x/Makefile
> index 201b7d4..eabad7d 100644
> --- a/arch/mips/ar231x/Makefile
> +++ b/arch/mips/ar231x/Makefile
> @@ -10,5 +10,7 @@
>
> obj-y += board.o prom.o devices.o
>
> +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
> +
> obj-$(CONFIG_SOC_AR5312) += ar5312.o
> obj-$(CONFIG_SOC_AR2315) += ar2315.o
> diff --git a/arch/mips/ar231x/early_printk.c b/arch/mips/ar231x/early_printk.c
> new file mode 100644
> index 0000000..393c5ab
> --- /dev/null
> +++ b/arch/mips/ar231x/early_printk.c
> @@ -0,0 +1,45 @@
> +/*
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License. See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2010 Gabor Juhos <juhosg@xxxxxxxxxxx>
> + */
> +
> +#include <linux/mm.h>
> +#include <linux/io.h>
> +#include <linux/serial_reg.h>
> +
> +#include <ar2315_regs.h>
> +#include <ar5312_regs.h>
> +#include "devices.h"
> +
> +static inline void prom_uart_wr(void __iomem *base, unsigned reg,
> + unsigned char ch)
> +{
> + __raw_writel(ch, base + 4 * reg);
> +}
> +
> +static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
> +{
> + return __raw_readl(base + 4 * reg);
> +}
> +
> +void prom_putchar(unsigned char ch)
> +{
> + static void __iomem *base;
> +
> + if (unlikely(base == NULL)) {
> + if (is_2315())
> + base = (void __iomem *)(KSEG1ADDR(AR2315_UART0));
> + else
> + base = (void __iomem *)(KSEG1ADDR(AR5312_UART0));
> + }
> +
> + while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
> + ;
> + prom_uart_wr(base, UART_TX, ch);
> + while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
> + ;
> +}
Have you tried using EARLY_PRINTK_8250 instead? Since this is a 8250 anyway.
Jonas
