From 0bb474a48e5d1ceb8e4005c7664b548c9834a784 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Tue, 20 Jun 2006 18:47:26 +1000 Subject: [POWERPC] support ibm,extended-*-frequency properties 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 Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/time.c | 57 ++++++++++++++++++++++++---------------------- 1 file changed, 30 insertions(+), 27 deletions(-) (limited to 'arch') diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 528e7f84cb67..d20907561f46 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -857,42 +857,50 @@ int do_settimeofday(struct timespec *tv) 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; unsigned int *fp; - int node_found; + int found = 0; - /* - * The cpu node should have a timebase-frequency property - * to tell us the rate at which the decrementer counts. - */ + /* The cpu node should have timebase and clock frequency properties */ cpu = of_find_node_by_type(NULL, "cpu"); - ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */ - node_found = 0; if (cpu) { - fp = (unsigned int *)get_property(cpu, "timebase-frequency", - NULL); + fp = (unsigned int *)get_property(cpu, name, NULL); if (fp) { - node_found = 1; - ppc_tb_freq = *fp; + found = 1; + *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 " "(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 /* Set the time base to zero */ mtspr(SPRN_TBWL, 0); @@ -904,11 +912,6 @@ void __init generic_calibrate_decr(void) /* Enable decrementer interrupt */ mtspr(SPRN_TCR, TCR_DIE); #endif - if (!node_found) - printk(KERN_ERR "WARNING: Estimating processor frequency " - "(not found)\n"); - - of_node_put(cpu); } unsigned long get_boot_time(void) -- cgit v1.2.3-59-g8ed1b