/* devices.c: Initial scan of the prom device tree for important
* Sparc device nodes which we need to find.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <asm/page.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/smp.h>
#include <asm/spitfire.h>
#include <asm/timer.h>
#include <asm/cpudata.h>
/* Used to synchronize acceses to NatSemi SUPER I/O chip configure
* operations in asm/ns87303.h
*/
DEFINE_SPINLOCK(ns87303_lock);
extern void cpu_probe(void);
extern void central_probe(void);
static char *cpu_mid_prop(void)
{
if (tlb_type == spitfire)
return "upa-portid";
return "portid";
}
static int check_cpu_node(int nd, int *cur_inst,
int (*compare)(int, int, void *), void *compare_arg,
int *prom_node, int *mid)
{
char node_str[128];
prom_getstring(nd, "device_type", node_str, sizeof(node_str));
if (strcmp(node_str, "cpu"))
return -ENODEV;
if (!compare(nd, *cur_inst, compare_arg)) {
if (prom_node)
*prom_node = nd;
if (mid)
*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
return 0;
}
(*cur_inst)++;
return -ENODEV;
}
static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
int *prom_node, int *mid)
{
int nd, cur_inst, err;
nd = prom_root_node;
cur_inst = 0;
err = check_cpu_node(nd, &cur_inst,
compare, compare_arg,
prom_node, mid);
if (err == 0)
return 0;
nd = prom_getchild(nd);
while ((nd = prom_getsibling(nd)) != 0) {
err = check_cpu_node(nd, &cur_inst,
compare, compare_arg,
prom_node, mid);
if (err == 0)
return 0;
}
return -ENODEV;
}
static int cpu_instance_compare(int nd, int instance, void *_arg)
{
int desired_instance = (int) (long) _arg;
if (instance == desired_instance)
return 0;
return -ENODEV;
}
int cpu_find_by_instance(int instance, int *prom_node, int *mid)
{
return __cpu_find_by(cpu_instance_compare, (void *)(long)instance,
prom_node, mid);
}
static int cpu_mid_compare(int nd, int instance, void *_arg)
{
int desired_mid = (int) (long) _arg;
int this_mid;
this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
if (this_mid == desired_mid)
return 0;
return -ENODEV;
}
int cpu_find_by_mid(int mid, int *prom_node)
{
return __cpu_find_by(cpu_mid_compare, (void *)(long)mid,
prom_node, NULL);
}
void __init device_scan(void)
{
/* FIX ME FAST... -DaveM */
ioport_resource.end = 0xffffffffffffffffUL;
prom_printf("Booting Linux...\n");
#ifndef CONFIG_SMP
{
int err, cpu_node;
err = cpu_find_by_instance(0, &cpu_node, NULL);
if (err) {
prom_printf("No cpu nodes, cannot continue\n");
prom_halt();
}
cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
"clock-frequency",
0);
}
#endif
central_probe();
cpu_probe();
}
