blob: 2d415d2a8e6823b08067b6db7fd011b19d264864 [file] [log] [blame]
Leo Chen34559122009-08-07 20:01:47 +01001/*****************************************************************************
2* Copyright 2003 - 2008 Broadcom Corporation. All rights reserved.
3*
4* Unless you and Broadcom execute a separate written software license
5* agreement governing use of this software, this software is licensed to you
6* under the terms of the GNU General Public License version 2, available at
7* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
8*
9* Notwithstanding the above, under no circumstances may you combine this
10* software in any way with any other Broadcom software provided under a
11* license other than the GPL, without Broadcom's express prior written
12* consent.
13*****************************************************************************/
14
15#include <linux/version.h>
16#include <linux/types.h>
17#include <linux/module.h>
18#include <csp/tmrHw.h>
19
20#include <mach/timer.h>
21/* The core.c file initializes timers 1 and 3 as a linux clocksource. */
22/* The real time clock should probably be the real linux clocksource. */
23/* In the meantime, this file should agree with core.c as to the */
24/* profiling timer. If the clocksource is moved to rtc later, then */
25/* we can init the profiling timer here instead. */
26
27/* Timer 1 provides 25MHz resolution syncrhonized to scheduling and APM timing */
28/* Timer 3 provides bus freqeuncy sychronized to ACLK, but spread spectrum will */
29/* affect synchronization with scheduling and APM timing. */
30
31#define PROF_TIMER 1
32
33timer_tick_rate_t timer_get_tick_rate(void)
34{
35 return tmrHw_getCountRate(PROF_TIMER);
36}
37
38timer_tick_count_t timer_get_tick_count(void)
39{
40 return tmrHw_GetCurrentCount(PROF_TIMER); /* change downcounter to upcounter */
41}
42
43timer_msec_t timer_ticks_to_msec(timer_tick_count_t ticks)
44{
45 static int tickRateMsec;
46
47 if (tickRateMsec == 0) {
48 tickRateMsec = timer_get_tick_rate() / 1000;
49 }
50
51 return ticks / tickRateMsec;
52}
53
54timer_msec_t timer_get_msec(void)
55{
56 return timer_ticks_to_msec(timer_get_tick_count());
57}
58
59EXPORT_SYMBOL(timer_get_tick_count);
60EXPORT_SYMBOL(timer_ticks_to_msec);
61EXPORT_SYMBOL(timer_get_tick_rate);
62EXPORT_SYMBOL(timer_get_msec);