/* 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(); }