/* 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 */spinlock_t ns87303_lock = SPIN_LOCK_UNLOCKED;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();}