io.c

linux 内核源代码

/*
 * DaVinci I/O mapping code
 *
 * Copyright (C) 2005-2006 Texas Instruments
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/tlb.h>
#include <asm/io.h>
#include <asm/memory.h>

#include <asm/mach/map.h>
#include <asm/arch/clock.h>

extern void davinci_check_revision(void);

/*
 * The machine specific code may provide the extra mapping besides the
 * default mapping provided here.
 */
static struct map_desc davinci_io_desc[] __initdata = {
	{
		.virtual	= IO_VIRT,
		.pfn		= __phys_to_pfn(IO_PHYS),
		.length		= IO_SIZE,
		.type		= MT_DEVICE
	},
};

void __init davinci_map_common_io(void)
{
	iotable_init(davinci_io_desc, ARRAY_SIZE(davinci_io_desc));

	/* Normally devicemaps_init() would flush caches and tlb after
	 * mdesc->map_io(), but we must also do it here because of the CPU
	 * revision check below.
	 */
	local_flush_tlb_all();
	flush_cache_all();

	/* We want to check CPU revision early for cpu_is_xxxx() macros.
	 * IO space mapping must be initialized before we can do that.
	 */
	davinci_check_revision();
}

void __init davinci_init_common_hw(void)
{
	davinci_clk_init();
}