core.c

来自「h内核」· C语言 代码 · 共 115 行

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

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

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

static struct plat_serial8250_port serial_platform_data[] = {
	{
		.iobase		= 0x3f8,
		.irq		= 4,
		.uartclk	= 1843200,
		.regshift	= 2,
		.iotype		= UPIO_PORT,
		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
	},
	{
		.iobase		= 0x2f8,
		.irq		= 3,
		.uartclk	= 1843200,
		.regshift	= 2,
		.iotype		= UPIO_PORT,
		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
	},
	{ },
};

static struct platform_device serial_device = {
	.name			= "serial8250",
	.id			= 0,
	.dev			= {
		.platform_data	= serial_platform_data,
	},
};

static int __init shark_init(void)
{
	int ret;

	if (machine_is_shark())
		ret = platform_device_register(&serial_device);

	return ret;
}

arch_initcall(shark_init);

extern void shark_init_irq(void);

static struct map_desc shark_io_desc[] __initdata = {
	{ IO_BASE	, IO_START	, IO_SIZE	, MT_DEVICE }
};

static void __init shark_map_io(void)
{
	iotable_init(shark_io_desc, ARRAY_SIZE(shark_io_desc));
}

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

static irqreturn_t
shark_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	write_seqlock(&xtime_lock);
	timer_tick(regs);
	write_sequnlock(&xtime_lock);
	return IRQ_HANDLED;
}

static struct irqaction shark_timer_irq = {
	.name		= "Shark Timer Tick",
	.flags		= SA_INTERRUPT,
	.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 struct sys_timer shark_timer = {
	.init		= shark_timer_init,
};

MACHINE_START(SHARK, "Shark")
	MAINTAINER("Alexander Schulz")
	BOOT_MEM(0x08000000, 0x40000000, 0xe0000000)
	BOOT_PARAMS(0x08003000)
	MAPIO(shark_map_io)
	INITIRQ(shark_init_irq)
	.timer		= &shark_timer,
MACHINE_END