devices.c
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上传日期:2013-04-10
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- /* 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/string.h>
- #include <linux/init.h>
- #include <asm/page.h>
- #include <asm/oplib.h>
- #include <asm/smp.h>
- #include <asm/system.h>
- struct prom_cpuinfo linux_cpus[32];
- int linux_num_cpus = 0;
- extern void cpu_probe(void);
- extern void clock_stop_probe(void); /* tadpole.c */
- extern void sun4c_probe_memerr_reg(void);
- void __init
- device_scan(void)
- {
- char node_str[128];
- int thismid;
- prom_getstring(prom_root_node, "device_type", node_str, sizeof(node_str));
- prom_printf("Booting Linux...n");
- if(strcmp(node_str, "cpu") == 0) {
- linux_num_cpus++;
- } else {
- int scan;
- scan = prom_getchild(prom_root_node);
- /* One can look it up in PROM instead */
- while ((scan = prom_getsibling(scan)) != 0) {
- prom_getstring(scan, "device_type",
- node_str, sizeof(node_str));
- if (strcmp(node_str, "cpu") == 0) {
- linux_cpus[linux_num_cpus].prom_node = scan;
- prom_getproperty(scan, "mid",
- (char *) &thismid, sizeof(thismid));
- linux_cpus[linux_num_cpus].mid = thismid;
- printk("Found CPU %d <node=%08lx,mid=%d>n",
- linux_num_cpus, (unsigned long) scan, thismid);
- linux_num_cpus++;
- }
- }
- if (linux_num_cpus == 0 && sparc_cpu_model == sun4d) {
- scan = prom_getchild(prom_root_node);
- for (scan = prom_searchsiblings(scan, "cpu-unit"); scan;
- scan = prom_searchsiblings(prom_getsibling(scan), "cpu-unit")) {
- int node = prom_getchild(scan);
- prom_getstring(node, "device_type",
- node_str, sizeof(node_str));
- if (strcmp(node_str, "cpu") == 0) {
- prom_getproperty(node, "cpu-id",
- (char *) &thismid, sizeof(thismid));
- linux_cpus[linux_num_cpus].prom_node = node;
- linux_cpus[linux_num_cpus].mid = thismid;
- printk("Found CPU %d <node=%08lx,mid=%d>n",
- linux_num_cpus, (unsigned long) node, thismid);
- linux_num_cpus++;
- }
- }
- }
- if (linux_num_cpus == 0) {
- printk("No CPU nodes found, cannot continue.n");
- /* Probably a sun4e, Sun is trying to trick us ;-) */
- halt();
- }
- printk("Found %d CPU prom device tree node(s).n", linux_num_cpus);
- }
- cpu_probe();
- #ifdef CONFIG_SUN_AUXIO
- {
- extern void auxio_probe(void);
- extern void auxio_power_probe(void);
- auxio_probe();
- auxio_power_probe();
- }
- #endif
- clock_stop_probe();
- if (ARCH_SUN4C_SUN4)
- sun4c_probe_memerr_reg();
- return;
- }