1 /*****************************************************************************
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/types.h>
16 #include <linux/module.h>
17 #include <csp/tmrHw.h>
18 
19 #include <mach/timer.h>
20 /* The core.c file initializes timers 1 and 3 as a linux clocksource. */
21 /* The real time clock should probably be the real linux clocksource. */
22 /* In the meantime, this file should agree with core.c as to the */
23 /* profiling timer. If the clocksource is moved to rtc later, then */
24 /* we can init the profiling timer here instead. */
25 
26 /* Timer 1 provides 25MHz resolution syncrhonized to scheduling and APM timing */
27 /* Timer 3 provides bus freqeuncy sychronized to ACLK, but spread spectrum will */
28 /* affect synchronization with scheduling and APM timing. */
29 
30 #define PROF_TIMER 1
31 
timer_get_tick_rate(void)32 timer_tick_rate_t timer_get_tick_rate(void)
33 {
34 	return tmrHw_getCountRate(PROF_TIMER);
35 }
36 
timer_get_tick_count(void)37 timer_tick_count_t timer_get_tick_count(void)
38 {
39 	return tmrHw_GetCurrentCount(PROF_TIMER);	/* change downcounter to upcounter */
40 }
41 
timer_ticks_to_msec(timer_tick_count_t ticks)42 timer_msec_t timer_ticks_to_msec(timer_tick_count_t ticks)
43 {
44 	static int tickRateMsec;
45 
46 	if (tickRateMsec == 0) {
47 		tickRateMsec = timer_get_tick_rate() / 1000;
48 	}
49 
50 	return ticks / tickRateMsec;
51 }
52 
timer_get_msec(void)53 timer_msec_t timer_get_msec(void)
54 {
55 	return timer_ticks_to_msec(timer_get_tick_count());
56 }
57 
58 EXPORT_SYMBOL(timer_get_tick_count);
59 EXPORT_SYMBOL(timer_ticks_to_msec);
60 EXPORT_SYMBOL(timer_get_tick_rate);
61 EXPORT_SYMBOL(timer_get_msec);
62