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    Subject[PATCH v4 03/16] [loongson] early_printk: add new implmentation
    Date
    From: Wu Zhangjin <wuzj@lemote.com>

    This patch is based on the implementation in the lm2e-fixes branch of
    Philippe's git://git.linux-cisco.org/linux-mips.git and the
    malta-specific early_printk implementation.

    Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
    ---
    arch/mips/lemote/lm2e/Makefile | 5 ++++
    arch/mips/lemote/lm2e/early_printk.c | 41 ++++++++++++++++++++++++++++++++++
    2 files changed, 46 insertions(+), 0 deletions(-)
    create mode 100644 arch/mips/lemote/lm2e/early_printk.c
    diff --git a/arch/mips/lemote/lm2e/Makefile b/arch/mips/lemote/lm2e/Makefile
    index b0c0339..f191732 100644
    --- a/arch/mips/lemote/lm2e/Makefile
    +++ b/arch/mips/lemote/lm2e/Makefile
    @@ -4,4 +4,9 @@

    obj-y += setup.o prom.o reset.o irq.o pci.o bonito-irq.o mem.o

    +#
    +# Early printk support
    +#
    +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
    +
    EXTRA_CFLAGS += -Werror
    diff --git a/arch/mips/lemote/lm2e/early_printk.c b/arch/mips/lemote/lm2e/early_printk.c
    new file mode 100644
    index 0000000..811c7de
    --- /dev/null
    +++ b/arch/mips/lemote/lm2e/early_printk.c
    @@ -0,0 +1,41 @@
    +/* early printk support
    + *
    + * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
    + * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
    + * Author: Wu Zhangjin, wuzj@lemote.com
    + *
    + * 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.
    + */
    +#include <linux/io.h>
    +#include <linux/init.h>
    +#include <linux/serial_reg.h>
    +
    +#include <asm/mips-boards/bonito64.h>
    +
    +#define UART_BASE (BONITO_PCIIO_BASE + 0x3f8)
    +
    +#define PORT(base, offset) (u8 *)(base + offset)
    +
    +static inline unsigned int serial_in(phys_addr_t base, int offset)
    +{
    + return readb(PORT(base, offset));
    +}
    +
    +static inline void serial_out(phys_addr_t base, int offset, int value)
    +{
    + writeb(value, PORT(base, offset));
    +}
    +
    +void prom_putchar(char c)
    +{
    + phys_addr_t uart_base =
    + (phys_addr_t) ioremap_nocache(UART_BASE, 8);
    +
    + while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0)
    + ;
    +
    + serial_out(uart_base, UART_TX, c);
    +}
    --
    1.6.2.1


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