From f6a2740d0c1b3fd0d3cc8ec17e232f82f2d8b14c Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Thu, 2 Jul 2009 23:20:20 +0800 Subject: [PATCH] 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 Signed-off-by: Ralf Baechle --- arch/mips/lemote/lm2e/Makefile | 5 ++++ arch/mips/lemote/lm2e/early_printk.c | 41 ++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) 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 b0c03390241d..f19173252d6a 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 000000000000..811c7dec1edd --- /dev/null +++ b/arch/mips/lemote/lm2e/early_printk.c @@ -0,0 +1,41 @@ +/* early printk support + * + * Copyright (c) 2009 Philippe Vachon + * 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 +#include +#include + +#include + +#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); +} -- 2.20.1