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authorMichael Hennerich <michael.hennerich@analog.com>2008-04-25 04:58:29 +0800
committerBryan Wu <cooloney@kernel.org>2008-04-25 04:58:29 +0800
commite6c91b64dd6e4c3adf39483c85a936eef9465e19 (patch)
treefb21af3166c55866dd587dd30c3807e9218054a9 /arch/blackfin/kernel/time.c
parentfe44193c55e26b9b835722b5ee2519972f59c540 (diff)
[Blackfin] arch: Functional power management support: Add support for cpu frequency scaling
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/kernel/time.c')
-rw-r--r--arch/blackfin/kernel/time.c19
1 files changed, 3 insertions, 16 deletions
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c
index 715b3945e4c..eb235232045 100644
--- a/arch/blackfin/kernel/time.c
+++ b/arch/blackfin/kernel/time.c
@@ -6,9 +6,10 @@
* Created:
* Description: This file contains the bfin-specific time handling details.
* Most of the stuff is located in the machine specific files.
+ * FIXME: (This file is subject for removal)
*
* Modified:
- * Copyright 2004-2006 Analog Devices Inc.
+ * Copyright 2004-2008 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
@@ -35,6 +36,7 @@
#include <linux/irq.h>
#include <asm/blackfin.h>
+#include <asm/time.h>
/* This is an NTP setting */
#define TICK_SIZE (tick_nsec / 1000)
@@ -47,21 +49,6 @@ static struct irqaction bfin_timer_irq = {
.flags = IRQF_DISABLED
};
-/*
- * The way that the Blackfin core timer works is:
- * - CCLK is divided by a programmable 8-bit pre-scaler (TSCALE)
- * - Every time TSCALE ticks, a 32bit is counted down (TCOUNT)
- *
- * If you take the fastest clock (1ns, or 1GHz to make the math work easier)
- * 10ms is 10,000,000 clock ticks, which fits easy into a 32-bit counter
- * (32 bit counter is 4,294,967,296ns or 4.2 seconds) so, we don't need
- * to use TSCALE, and program it to zero (which is pass CCLK through).
- * If you feel like using it, try to keep HZ * TIMESCALE to some
- * value that divides easy (like power of 2).
- */
-
-#define TIME_SCALE 1
-
static void
time_sched_init(irq_handler_t timer_routine)
{