linux-kernel - [PATCH v4 03/16] [loongson] early

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Date:	Thu,  2 Jul 2009 23:20:20 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org, Jason Wessel <jason.wessel@...driver.com>
Cc:	Wu Zhangjin <wuzj@...ote.com>, Yan Hua <yanh@...ote.com>,
	Philippe Vachon <philippe@...pig.ca>,
	Zhang Le <r0bertz@...too.org>,
	Zhang Fuxin <zhangfx@...ote.com>,
	loongson-dev <loongson-dev@...glegroups.com>,
	Liu Junliang <liujl@...ote.com>,
	Erwan Lerale <erwan@...scow.com>,
	Arnaud Patard <apatard@...driva.com>
Subject: [PATCH v4 03/16] [loongson] early_printk: add new implmentation

From: Wu Zhangjin <wuzj@...ote.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@...ote.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@...pig.ca>
+ *  Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
+ *  Author: Wu Zhangjin, wuzj@...ote.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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