[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 <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 30 insertions, 27 deletions

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)