1. 根目录:
2. arch
3. sh
4. include
5. asm
6. heartbeat.h

#ifndef __ASM_SH_HEARTBEAT_H
#define __ASM_SH_HEARTBEAT_H

#include <linux/timer.h>

#define HEARTBEAT_INVERTED	(1 << 0)

struct heartbeat_data {
	void __iomem *base;
	unsigned char *bit_pos;
	unsigned int nr_bits;
	struct timer_list timer;
	unsigned int regsize;
	unsigned int mask;
	unsigned long flags;
};

#endif /* __ASM_SH_HEARTBEAT_H */