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/* 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);
}
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