/* auxio.c: Probing for the Sparc AUXIO register at boot time.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#include <asm/oplib.h>
#include <asm/io.h>

/* Probe and map in the Auxiliary I/O register */
unsigned char *auxio_register;

void
auxio_probe(void)
{
	int node, auxio_nd;
	struct linux_prom_registers auxregs[1];

	node = prom_getchild(prom_root_node);
	auxio_nd = prom_searchsiblings(node, "auxiliary-io");
	if(!auxio_nd) {
		node = prom_searchsiblings(node, "obio");
		node = prom_getchild(node);
		auxio_nd = prom_searchsiblings(node, "auxio");
		if(!auxio_nd) {
			prom_printf("Cannot find auxio node, cannot continue...\n");
			prom_halt();
		}
	}
	prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs));
	prom_apply_obio_ranges(auxregs, 0x1);
	/* Map the register both read and write */
	auxio_register = (unsigned char *) sparc_alloc_io(auxregs[0].phys_addr, 0,
							  auxregs[0].reg_size,
							  "auxiliaryIO",
							  auxregs[0].which_io, 0x0);
	/* Fix the address on sun4m and sun4c. */
	if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
	   sparc_cpu_model == sun4c)
		auxio_register = (unsigned char *) ((int)auxio_register | 3);
}