1. 根目录:
2. arch
3. arm
4. mach-shark
5. core.c

/*
 *  linux/arch/arm/mach-shark/arch.c
 *
 *  Architecture specific stuff.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/serial_8250.h>
#include <linux/io.h>
#include <linux/cpu.h>

#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/param.h>
#include <asm/system_misc.h>

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

#define ROMCARD_SIZE            0x08000000
#define ROMCARD_START           0x10000000

static void shark_restart(char mode, const char *cmd)
{
        short temp;
        /* Reset the Machine via pc[3] of the sequoia chipset */
        outw(0x09,0x24);
        temp=inw(0x26);
        temp = temp | (1<<3) | (1<<10);
        outw(0x09,0x24);
        outw(temp,0x26);
}

static struct plat_serial8250_port serial_platform_data[] = {
	{
		.iobase		= 0x3f8,
		.irq		= 4,
		.uartclk	= 1843200,
		.regshift	= 0,
		.iotype		= UPIO_PORT,
		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
	},
	{
		.iobase		= 0x2f8,
		.irq		= 3,
		.uartclk	= 1843200,
		.regshift	= 0,
		.iotype		= UPIO_PORT,
		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
	},
	{ },
};

static struct platform_device serial_device = {
	.name			= "serial8250",
	.id			= PLAT8250_DEV_PLATFORM,
	.dev			= {
		.platform_data	= serial_platform_data,
	},
};

static struct resource rtc_resources[] = {
	[0] = {
		.start	= 0x70,
		.end	= 0x73,
		.flags	= IORESOURCE_IO,
	},
	[1] = {
		.start	= IRQ_ISA_RTC_ALARM,
		.end	= IRQ_ISA_RTC_ALARM,
		.flags	= IORESOURCE_IRQ,
	}
};

static struct platform_device rtc_device = {
	.name		= "rtc_cmos",
	.id		= -1,
	.resource	= rtc_resources,
	.num_resources	= ARRAY_SIZE(rtc_resources),
};

static int __init shark_init(void)
{
	int ret;

	if (machine_is_shark())
	{
	        ret = platform_device_register(&rtc_device);
		if (ret) printk(KERN_ERR "Unable to register RTC device: %d\n", ret);
		ret = platform_device_register(&serial_device);
		if (ret) printk(KERN_ERR "Unable to register Serial device: %d\n", ret);
	}
	return 0;
}

arch_initcall(shark_init);

extern void shark_init_irq(void);

#define IRQ_TIMER 0
#define HZ_TIME ((1193180 + HZ/2) / HZ)

static irqreturn_t
shark_timer_interrupt(int irq, void *dev_id)
{
	timer_tick();
	return IRQ_HANDLED;
}

static struct irqaction shark_timer_irq = {
	.name		= "Shark Timer Tick",
	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
	.handler	= shark_timer_interrupt,
};

/*
 * Set up timer interrupt, and return the current time in seconds.
 */
static void __init shark_timer_init(void)
{
	outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
	outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
	outb(HZ_TIME >> 8, 0x40);

	setup_irq(IRQ_TIMER, &shark_timer_irq);
}

static void shark_init_early(void)
{
	cpu_idle_poll_ctrl(true);
}

MACHINE_START(SHARK, "Shark")
	/* Maintainer: Alexander Schulz */
	.atag_offset	= 0x3000,
	.init_early	= shark_init_early,
	.init_irq	= shark_init_irq,
	.init_time	= shark_timer_init,
	.dma_zone_size	= SZ_4M,
	.restart	= shark_restart,
MACHINE_END