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MIPS: Malta: Use gic_read_count() to read GIC timer 

Instead of reading the GIC registers directly, use the interface the GIC
driver already exposes for reading the global timer.  Also get rid of
the unnecessary #ifdefs.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8123/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Andrew Bresticker 2014-10-20 12:03:48 -07:00 committed by Ralf Baechle
parent a393d93059
commit 7d9ad5d8c3
1 changed files with 3 additions and 11 deletions
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14
arch/mips/mti-malta/malta-time.c
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@ -70,9 +70,7 @@ static void __init estimate_frequencies(void)
{
unsigned long flags;
unsigned int count, start;
#ifdef CONFIG_MIPS_GIC
unsigned int giccount = 0, gicstart = 0;
#endif
cycle_t giccount = 0, gicstart = 0;
#if defined(CONFIG_KVM_GUEST) && CONFIG_KVM_GUEST_TIMER_FREQ
mips_hpt_frequency = CONFIG_KVM_GUEST_TIMER_FREQ * 1000000;
@ -87,32 +85,26 @@ static void __init estimate_frequencies(void)
/* Initialize counters. */
start = read_c0_count();
#ifdef CONFIG_MIPS_GIC
if (gic_present)
GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_31_00), gicstart);
#endif
gicstart = gic_read_count();
/* Read counter exactly on falling edge of update flag. */
while (CMOS_READ(RTC_REG_A) & RTC_UIP);
while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
count = read_c0_count();
#ifdef CONFIG_MIPS_GIC
if (gic_present)
GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_31_00), giccount);
#endif
giccount = gic_read_count();
local_irq_restore(flags);
count -= start;
mips_hpt_frequency = count;
#ifdef CONFIG_MIPS_GIC
if (gic_present) {
giccount -= gicstart;
gic_frequency = giccount;
}
#endif
}
void read_persistent_clock(struct timespec *ts)