146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
/* devices.c: Initial scan of the prom device tree for important
|
|
* Sparc device nodes which we need to find.
|
|
*
|
|
* This is based on the sparc64 version, but sun4m doesn't always use
|
|
* the hardware MIDs, so be careful.
|
|
*
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/string.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/system.h>
|
|
#include <asm/cpudata.h>
|
|
|
|
extern void clock_stop_probe(void); /* tadpole.c */
|
|
extern void sun4c_probe_memerr_reg(void);
|
|
|
|
static char *cpu_mid_prop(void)
|
|
{
|
|
if (sparc_cpu_model == sun4d)
|
|
return "cpu-id";
|
|
return "mid";
|
|
}
|
|
|
|
static int check_cpu_node(phandle nd, int *cur_inst,
|
|
int (*compare)(phandle, int, void *), void *compare_arg,
|
|
phandle *prom_node, int *mid)
|
|
{
|
|
if (!compare(nd, *cur_inst, compare_arg)) {
|
|
if (prom_node)
|
|
*prom_node = nd;
|
|
if (mid) {
|
|
*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
|
|
if (sparc_cpu_model == sun4m)
|
|
*mid &= 3;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
(*cur_inst)++;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __cpu_find_by(int (*compare)(phandle, int, void *),
|
|
void *compare_arg, phandle *prom_node, int *mid)
|
|
{
|
|
struct device_node *dp;
|
|
int cur_inst;
|
|
|
|
cur_inst = 0;
|
|
for_each_node_by_type(dp, "cpu") {
|
|
int err = check_cpu_node(dp->phandle, &cur_inst,
|
|
compare, compare_arg,
|
|
prom_node, mid);
|
|
if (!err) {
|
|
of_node_put(dp);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int cpu_instance_compare(phandle nd, int instance, void *_arg)
|
|
{
|
|
int desired_instance = (int) _arg;
|
|
|
|
if (instance == desired_instance)
|
|
return 0;
|
|
return -ENODEV;
|
|
}
|
|
|
|
int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
|
|
{
|
|
return __cpu_find_by(cpu_instance_compare, (void *)instance,
|
|
prom_node, mid);
|
|
}
|
|
|
|
static int cpu_mid_compare(phandle nd, int instance, void *_arg)
|
|
{
|
|
int desired_mid = (int) _arg;
|
|
int this_mid;
|
|
|
|
this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
|
|
if (this_mid == desired_mid
|
|
|| (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
|
|
return 0;
|
|
return -ENODEV;
|
|
}
|
|
|
|
int cpu_find_by_mid(int mid, phandle *prom_node)
|
|
{
|
|
return __cpu_find_by(cpu_mid_compare, (void *)mid,
|
|
prom_node, NULL);
|
|
}
|
|
|
|
/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
|
|
* address (0-3). This gives us the true hardware mid, which might have
|
|
* some other bits set. On 4d hardware and software mids are the same.
|
|
*/
|
|
int cpu_get_hwmid(phandle prom_node)
|
|
{
|
|
return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
|
|
}
|
|
|
|
void __init device_scan(void)
|
|
{
|
|
printk(KERN_NOTICE "Booting Linux...\n");
|
|
|
|
#ifndef CONFIG_SMP
|
|
{
|
|
phandle cpu_node;
|
|
int err;
|
|
err = cpu_find_by_instance(0, &cpu_node, NULL);
|
|
if (err) {
|
|
/* Probably a sun4e, Sun is trying to trick us ;-) */
|
|
prom_printf("No cpu nodes, cannot continue\n");
|
|
prom_halt();
|
|
}
|
|
cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
|
|
"clock-frequency",
|
|
0);
|
|
}
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
{
|
|
extern void auxio_probe(void);
|
|
extern void auxio_power_probe(void);
|
|
auxio_probe();
|
|
auxio_power_probe();
|
|
}
|
|
clock_stop_probe();
|
|
|
|
if (ARCH_SUN4C)
|
|
sun4c_probe_memerr_reg();
|
|
}
|