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authorEric Miao <eric.miao@marvell.com>2008-12-18 04:10:32 +0100
committerEric Miao <eric.miao@marvell.com>2008-12-29 10:57:48 +0100
commit6769717d5d51596618f6b143008d8ace11ec8a69 (patch)
tree5f4b4b76211132d79e844314725ba4b9e459bc3c /arch/arm/mach-pxa
parent[ARM] pxa/tavorevb: update board support (smartpanel LCD + keypad) (diff)
downloadlinux-6769717d5d51596618f6b143008d8ace11ec8a69.tar.xz
linux-6769717d5d51596618f6b143008d8ace11ec8a69.zip
[ARM] rtc-sa1100: don't assume CLOCK_TICK_RATE to be a constant
As Nicolas and Russell pointed out, CLOCK_TICK_RATE is no more a constant on PXA when multiple processors and platforms are selected, change TIMER_FREQ in rtc-sa1100.c into a variable. Since the code to decide the clock tick rate is re-used from timer.c, introduce a common get_clock_tick_rate() for this. Signed-off-by: Eric Miao <eric.miao@marvell.com> Acked-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm/mach-pxa')
-rw-r--r--arch/arm/mach-pxa/generic.c16
-rw-r--r--arch/arm/mach-pxa/include/mach/hardware.h2
-rw-r--r--arch/arm/mach-pxa/include/mach/timex.h8
-rw-r--r--arch/arm/mach-pxa/time.c10
4 files changed, 27 insertions, 9 deletions
diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 85ed0b33331f..0ccc91c92c44 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -24,6 +24,7 @@
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
+#include <asm/mach-types.h>
#include <mach/pxa-regs.h>
#include <mach/reset.h>
@@ -39,6 +40,21 @@ void clear_reset_status(unsigned int mask)
pxa3xx_clear_reset_status(mask);
}
+unsigned long get_clock_tick_rate(void)
+{
+ unsigned long clock_tick_rate;
+
+ if (cpu_is_pxa25x())
+ clock_tick_rate = 3686400;
+ else if (machine_is_mainstone())
+ clock_tick_rate = 3249600;
+ else
+ clock_tick_rate = 3250000;
+
+ return clock_tick_rate;
+}
+EXPORT_SYMBOL(get_clock_tick_rate);
+
/*
* Get the clock frequency as reflected by CCCR and the turbo flag.
* We assume these values have been applied via a fcs.
diff --git a/arch/arm/mach-pxa/include/mach/hardware.h b/arch/arm/mach-pxa/include/mach/hardware.h
index e2d6784aa7ef..c666796911cb 100644
--- a/arch/arm/mach-pxa/include/mach/hardware.h
+++ b/arch/arm/mach-pxa/include/mach/hardware.h
@@ -291,6 +291,8 @@
*/
extern unsigned int get_memclk_frequency_10khz(void);
+/* return the clock tick rate of the OS timer */
+extern unsigned long get_clock_tick_rate(void);
#endif
#if defined(CONFIG_MACH_ARMCORE) && defined(CONFIG_PCI)
diff --git a/arch/arm/mach-pxa/include/mach/timex.h b/arch/arm/mach-pxa/include/mach/timex.h
index b05fc6683c47..af6760a50e1a 100644
--- a/arch/arm/mach-pxa/include/mach/timex.h
+++ b/arch/arm/mach-pxa/include/mach/timex.h
@@ -10,6 +10,14 @@
* published by the Free Software Foundation.
*/
+/* Various drivers are still using the constant of CLOCK_TICK_RATE, for
+ * those drivers to at least work, the definition is provided here.
+ *
+ * NOTE: this is no longer accurate when multiple processors and boards
+ * are selected, newer drivers should not depend on this any more. Use
+ * either the clocksource/clockevent or get this at run-time by calling
+ * get_clock_tick_rate() (as defined in generic.c).
+ */
#if defined(CONFIG_PXA25x)
/* PXA250/210 timer base */
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
index f8a9a62959e5..986d494a1834 100644
--- a/arch/arm/mach-pxa/time.c
+++ b/arch/arm/mach-pxa/time.c
@@ -23,7 +23,6 @@
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <mach/pxa-regs.h>
-#include <asm/mach-types.h>
/*
* This is PXA's sched_clock implementation. This has a resolution
@@ -150,18 +149,11 @@ static struct irqaction pxa_ost0_irq = {
static void __init pxa_timer_init(void)
{
- unsigned long clock_tick_rate;
+ unsigned long clock_tick_rate = get_clock_tick_rate();
OIER = 0;
OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
- if (cpu_is_pxa25x())
- clock_tick_rate = 3686400;
- else if (machine_is_mainstone())
- clock_tick_rate = 3249600;
- else
- clock_tick_rate = 3250000;
-
set_oscr2ns_scale(clock_tick_rate);
ckevt_pxa_osmr0.mult =