Viewing file:  devices.c (2.85 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* 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);
unsigned long __init
device_scan(unsigned long mem_start)
{
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 */
/* prom_printf("root child is %08lx\n", (unsigned long) scan); */
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;
/* prom_printf("Found CPU %d <node=%08lx,mid=%d>\n", linux_num_cpus, (unsigned long) scan, 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) {
if (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;
/* prom_printf("Found CPU %d <node=%08lx,mid=%d>\n",
linux_num_cpus, (unsigned long) node, 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 mem_start;
}
|