diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2008-04-25 04:58:29 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2008-04-25 04:58:29 +0800 |
| commit | e6c91b64dd6e4c3adf39483c85a936eef9465e19 (patch) | |
| tree | fb21af3166c55866dd587dd30c3807e9218054a9 /arch/blackfin/kernel/time.c | |
| parent | fe44193c55e26b9b835722b5ee2519972f59c540 (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.c | 19 |
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) { |