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[POWERPC] support ibm,extended-*-frequency properties

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Support the ibm,extended-*-frequency properties found in recent POWER5
firmware:

cpus/PowerPC,POWER5@0/clock-frequency
                 59aa5880 (1504336000)
cpus/PowerPC,POWER5@0/ibm,extended-clock-frequency
                 00000000 59aa5880
cpus/PowerPC,POWER5@0/timebase-frequency
                 0b354b10 (188042000)
cpus/PowerPC,POWER5@0/ibm,extended-timebase-frequency
                 00000000 0b354b10

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard 2006-06-20 18:47:26 +10:00 committed by Paul Mackerras
parent ccba051c37
commit 0bb474a48e
1 changed files with 31 additions and 28 deletions
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59
arch/powerpc/kernel/time.c
View file

@ -857,42 +857,50 @@ int do_settimeofday(struct timespec *tv)
EXPORT_SYMBOL(do_settimeofday); EXPORT_SYMBOL(do_settimeofday);
void __init generic_calibrate_decr(void) static int __init get_freq(char *name, int cells, unsigned long *val)
{ {
struct device_node *cpu; struct device_node *cpu;
unsigned int *fp; unsigned int *fp;
int node_found; int found = 0;
/* /* The cpu node should have timebase and clock frequency properties */
* The cpu node should have a timebase-frequency property
* to tell us the rate at which the decrementer counts.
*/
cpu = of_find_node_by_type(NULL, "cpu"); cpu = of_find_node_by_type(NULL, "cpu");
ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */
node_found = 0;
if (cpu) { if (cpu) {
fp = (unsigned int *)get_property(cpu, "timebase-frequency", fp = (unsigned int *)get_property(cpu, name, NULL);
NULL);
if (fp) { if (fp) {
node_found = 1; found = 1;
ppc_tb_freq = *fp; *val = 0;
while (cells--)
*val = (*val << 32) | *fp++;
} }
of_node_put(cpu);
} }
if (!node_found)
return found;
}
void __init generic_calibrate_decr(void)
{
ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */
if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) &&
!get_freq("timebase-frequency", 1, &ppc_tb_freq)) {
printk(KERN_ERR "WARNING: Estimating decrementer frequency " printk(KERN_ERR "WARNING: Estimating decrementer frequency "
"(not found)\n"); "(not found)\n");
ppc_proc_freq = DEFAULT_PROC_FREQ;
node_found = 0;
if (cpu) {
fp = (unsigned int *)get_property(cpu, "clock-frequency",
NULL);
if (fp) {
node_found = 1;
ppc_proc_freq = *fp;
}
} }
ppc_proc_freq = DEFAULT_PROC_FREQ; /* hardcoded default */
if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) &&
!get_freq("clock-frequency", 1, &ppc_proc_freq)) {
printk(KERN_ERR "WARNING: Estimating processor frequency "
"(not found)\n");
}
#ifdef CONFIG_BOOKE #ifdef CONFIG_BOOKE
/* Set the time base to zero */ /* Set the time base to zero */
mtspr(SPRN_TBWL, 0); mtspr(SPRN_TBWL, 0);
@ -904,11 +912,6 @@ void __init generic_calibrate_decr(void)
/* Enable decrementer interrupt */ /* Enable decrementer interrupt */
mtspr(SPRN_TCR, TCR_DIE); mtspr(SPRN_TCR, TCR_DIE);
#endif #endif
if (!node_found)
printk(KERN_ERR "WARNING: Estimating processor frequency "
"(not found)\n");
of_node_put(cpu);
} }
unsigned long get_boot_time(void) unsigned long get_boot_time(void)