/*
 * $Id: bus.h,v 1.3 2007/10/16 18:31:07 init Exp $
 */
#ifndef _SYS_BUS_H
#define _SYS_BUS_H

#include <sys/device.h>

/*
 * Each bus (bus driver instance) has its own bus_handle.
 * Device drivers attached to bus aquire bus_handle to perform all bus i/o.
 */
struct bus_handle {
	uint8_t 	(*bus_read_1)(void *ddp, uint32_t addr);
	uint16_t 	(*bus_read_2)(void *ddp, uint32_t addr);
	uint32_t 	(*bus_read_4)(void *ddp, uint32_t addr);
	int 		(*bus_write_1)(void *ddp, uint32_t addr, uint8_t data);
	int 		(*bus_write_2)(void *ddp, uint32_t addr, uint16_t data);
	int 		(*bus_write_4)(void *ddp, uint32_t addr, uint32_t data);
	/* XXX DMA related stuff */
};

#define bus_read_1(dev, addr) ((struct busops *)dev->dv_devdata)->bus_read_1(dev, addr)

#define bus_write_1(dev, addr, data) ((struct busops *)dev->dv_devdata)->bus_write_1(dev, addr, data)

#endif /* _SYS_BUS_H */