1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
145 lines
3.0 KiB
C
145 lines
3.0 KiB
C
/* 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();
|
|
}
|