ARM: 5649/1: bcmring: add bcmring timer function

bcmring timer helper function, hardware register headers

Signed-off-by: Leo Chen <leochen@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-bcmring/timer.c

@@ -0,0 +1,62 @@
+/*****************************************************************************
+* Copyright 2003 - 2008 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <csp/tmrHw.h>
+
+#include <mach/timer.h>
+/* The core.c file initializes timers 1 and 3 as a linux clocksource. */
+/* The real time clock should probably be the real linux clocksource. */
+/* In the meantime, this file should agree with core.c as to the */
+/* profiling timer. If the clocksource is moved to rtc later, then */
+/* we can init the profiling timer here instead. */
+
+/* Timer 1 provides 25MHz resolution syncrhonized to scheduling and APM timing */
+/* Timer 3 provides bus freqeuncy sychronized to ACLK, but spread spectrum will */
+/* affect synchronization with scheduling and APM timing. */
+
+#define PROF_TIMER 1
+
+timer_tick_rate_t timer_get_tick_rate(void)
+{
+	return tmrHw_getCountRate(PROF_TIMER);
+}
+
+timer_tick_count_t timer_get_tick_count(void)
+{
+	return tmrHw_GetCurrentCount(PROF_TIMER);	/* change downcounter to upcounter */
+}
+
+timer_msec_t timer_ticks_to_msec(timer_tick_count_t ticks)
+{
+	static int tickRateMsec;
+
+	if (tickRateMsec == 0) {
+		tickRateMsec = timer_get_tick_rate() / 1000;
+	}
+
+	return ticks / tickRateMsec;
+}
+
+timer_msec_t timer_get_msec(void)
+{
+	return timer_ticks_to_msec(timer_get_tick_count());
+}
+
+EXPORT_SYMBOL(timer_get_tick_count);
+EXPORT_SYMBOL(timer_ticks_to_msec);
+EXPORT_SYMBOL(timer_get_tick_rate);
+EXPORT_SYMBOL(timer_get_msec);