diff options
| author | Wu Zhangjin <wuzj@lemote.com> | 2009-07-02 23:20:20 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-09-17 20:07:45 +0200 |
| commit | f6a2740d0c1b3fd0d3cc8ec17e232f82f2d8b14c (patch) | |
| tree | e65bc529fd5973fbc2f94bbcf55fce169075736f /arch | |
| parent | 95ff7c955376d5bd52f044f445ea04eab4fb0f9a (diff) | |
MIPS: Loongson: Add new early_printk implmentation
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>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/lemote/lm2e/Makefile | 5 | ||||
| -rw-r--r-- | arch/mips/lemote/lm2e/early_printk.c | 41 |
2 files changed, 46 insertions, 0 deletions
diff --git a/arch/mips/lemote/lm2e/Makefile b/arch/mips/lemote/lm2e/Makefile index b0c03390241..f19173252d6 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 00000000000..811c7dec1ed --- /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); +} |