/*
 * $Id: obio.c,v 1.9 2007/10/16 21:27:28 init Exp $
 */
#include <sys/types.h>
#include <sys/device.h>
#include <sys/mem.h>
#include <sys/bus.h>

#include <arch/testarm/dev/obiovar.h>
#include <libkern/printf.h>

/*
 * testarm obio (on-board i/o) support.
 * This is a simple memory read/writes.
 */
int obio_attach(struct device *, uint32_t, uint8_t);

uint8_t 	obio_read_1(void *, uint32_t);
uint16_t 	obio_read_2(void *, uint32_t);
uint32_t 	obio_read_4(void *, uint32_t);
int 		obio_write_1(void *, uint32_t, uint8_t);
int 		obio_write_2(void *, uint32_t, uint16_t);
int 		obio_write_4(void *, uint32_t, uint32_t);


struct driver obio_dr = {
	sizeof(struct obio_dd),
	obio_attach,
	NULL
};


int
obio_attach(struct device *self, uint32_t loc, uint8_t flags)
{
	struct obio_dd *ddp = self->dv_devdata;
	struct bus_handle *bhp = &ddp->od_bh;

	ddp->od_locked = 0;
	ddp->od_ndevices = 0;

	bhp->bus_read_1 = obio_read_1;
	bhp->bus_read_2 = obio_read_2;
	bhp->bus_read_4 = obio_read_4;
	bhp->bus_write_1 = obio_write_1;
	bhp->bus_write_2 = obio_write_2;
	bhp->bus_write_4 = obio_write_4;
	bhp->bh_ownerdd = self->dv_devdata;	/* XXX UGLY bus_{read|write} stuff will access bus device from bus_handle using this */ 

	/* expose our bus_handle to the world */
	self->dv_aux = bhp;

	printf("memory-mapped i/o\n");

	return(0);
}


uint8_t
obio_read_1(void *ddp, uint32_t addr)
{
	/*
	 * There is only one on-board i/o bus in testarm.
	 */
	return( (*(uint8_t *)addr) );
}


uint16_t
obio_read_2(void *ddp, uint32_t addr)
{
	return( (*(uint16_t *)addr) );
}


uint32_t
obio_read_4(void *ddp, uint32_t addr)
{
	return( (*(uint32_t *)addr) );
}


int
obio_write_1(void *ddp, uint32_t addr, uint8_t data)
{
	*((uint8_t *)addr) = data;

	/* XXX what about write errors? */
	return(0);
}


int
obio_write_2(void *ddp, uint32_t addr, uint16_t data)
{
	*((uint16_t *)addr) = data;

	return(0);
}


int
obio_write_4(void *ddp, uint32_t addr, uint32_t data)
{
	*((uint32_t *)addr) = data;

	return(0);
}