core.c

是关于linux2.5.1的完全源码

/*
 *  linux/arch/arm/mach-ebsa110/core.c
 *
 *  Copyright (C) 1998-2001 Russell King
 *
 * 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.
 *
 *  Extra MM routines for the EBSA-110 architecture
 */
#include <linux/mm.h>
#include <linux/init.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>

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

#define IRQ_MASK		0xfe000000	/* read */
#define IRQ_MSET		0xfe000000	/* write */
#define IRQ_STAT		0xff000000	/* read */
#define IRQ_MCLR		0xff000000	/* write */

static void ebsa110_mask_irq(unsigned int irq)
{
	__raw_writeb(1 << irq, IRQ_MCLR);
}

static void ebsa110_unmask_irq(unsigned int irq)
{
	__raw_writeb(1 << irq, IRQ_MSET);
}

static struct irqchip ebsa110_irq_chip = {
	ack:	ebsa110_mask_irq,
	mask:	ebsa110_mask_irq,
	unmask:	ebsa110_unmask_irq,
};
 
static void __init ebsa110_init_irq(void)
{
	unsigned long flags;
	unsigned int irq;

	local_irq_save(flags);
	__raw_writeb(0xff, IRQ_MCLR);
	__raw_writeb(0x55, IRQ_MSET);
	__raw_writeb(0x00, IRQ_MSET);
	if (__raw_readb(IRQ_MASK) != 0x55)
		while (1);
	__raw_writeb(0xff, IRQ_MCLR);	/* clear all interrupt enables */
	local_irq_restore(flags);

	for (irq = 0; irq < NR_IRQS; irq++) {
		set_irq_chip(irq, &ebsa110_irq_chip);
		set_irq_handler(irq, do_level_IRQ);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}
}

static struct map_desc ebsa110_io_desc[] __initdata = {
	/*
	 * sparse external-decode ISAIO space
	 */
	{ IRQ_STAT,    TRICK4_PHYS, PGDIR_SIZE,  DOMAIN_IO, 0, 1, 0, 0 }, /* IRQ_STAT/IRQ_MCLR */
	{ IRQ_MASK,    TRICK3_PHYS, PGDIR_SIZE,  DOMAIN_IO, 0, 1, 0, 0 }, /* IRQ_MASK/IRQ_MSET */
	{ SOFT_BASE,   TRICK1_PHYS, PGDIR_SIZE,  DOMAIN_IO, 0, 1, 0, 0 }, /* SOFT_BASE */
	{ PIT_BASE,    TRICK0_PHYS, PGDIR_SIZE,  DOMAIN_IO, 0, 1, 0, 0 }, /* PIT_BASE */

	/*
	 * self-decode ISAIO space
	 */
	{ ISAIO_BASE,  ISAIO_PHYS,  ISAIO_SIZE,  DOMAIN_IO, 0, 1, 0, 0 },
	{ ISAMEM_BASE, ISAMEM_PHYS, ISAMEM_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
	LAST_DESC
};

static void __init ebsa110_map_io(void)
{
	iotable_init(ebsa110_io_desc);
}

MACHINE_START(EBSA110, "EBSA110")
	MAINTAINER("Russell King")
	BOOT_MEM(0x00000000, 0xe0000000, 0xe0000000)
	BOOT_PARAMS(0x00000400)
	DISABLE_PARPORT(0)
	DISABLE_PARPORT(2)
	SOFT_REBOOT
	MAPIO(ebsa110_map_io)
	INITIRQ(ebsa110_init_irq)
MACHINE_END