/*
* $Id: obio.c,v 1.2 2007/10/16 18:11:47 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.
*/
uint8_t obio_read_1(struct device *, uint32_t);
uint16_t obio_read_2(struct device *, uint32_t);
uint32_t obio_read_4(struct device *, uint32_t);
int obio_write_1(struct device *, uint32_t, uint8_t);
int obio_write_2(struct device *, uint32_t, uint16_t);
int obio_write_4(struct device *, uint32_t, uint32_t);
int
obio_attach(struct device *self)
{
struct busops *aux = self->dv_aux;
aux = (struct busops *)kmalloc(sizeof(struct busops));
/*
* Link bus ops.
*/
aux->bus_read_1 = obio_read_1;
aux->bus_read_2 = obio_read_2;
aux->bus_read_4 = obio_read_4;
aux->bus_write_1 = obio_write_1;
aux->bus_write_2 = obio_write_2;
aux->bus_write_4 = obio_write_4;
printf("memory-mapped i/o\n");
return(0);
}
uint8_t
obio_read_1(struct device *devp, uint32_t addr)
{
/*
* struct device is not used in obio.
* There is only one on-board i/o bus in testarm.
*/
return( (*(uint8_t *)addr) );
}
uint16_t
obio_read_2(struct device *devp, uint32_t addr)
{
return( (*(uint16_t *)addr) );
}
uint32_t
obio_read_4(struct device *devp, uint32_t addr)
{
return( (*(uint32_t *)addr) );
}
int
obio_write_1(struct device *devp, uint32_t addr, uint8_t data)
{
*((uint8_t *)addr) = data;
/* XXX what about write errors? */
return(0);
}
int
obio_write_2(struct device *devp, uint32_t addr, uint16_t data)
{
*((uint16_t *)addr) = data;
return(0);
}
int
obio_write_4(struct device *devp, uint32_t addr, uint32_t data)
{
*((uint32_t *)addr) = data;
return(0);
}