2fde9668b4
time.h We Hardly Knew Ye. This deprecates time.h which is currently only used by Exynos5250 and Snow. The original idea was to try and unify some of the various timer interfaces and has been supplanted by the monotonic timer API. timer_us() is now obsolete. timer_start() is now mct_start() and is exposed in exynos5250/clk.h. Signed-off-by: David Hendricks <dhendrix@chromium.org> Change-Id: I14ebf75649d101491252c9aafea12f73ccf446b5 Reviewed-on: http://review.coreboot.org/3177 Reviewed-by: Aaron Durbin <adurbin@google.com> Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <delay.h>
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#include <timer.h>
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#include "clk.h"
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static struct monotonic_counter {
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int initialized;
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struct mono_time time;
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uint64_t last_value;
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} mono_counter;
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static const uint32_t clocks_per_usec = MCT_HZ/1000000;
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void timer_monotonic_get(struct mono_time *mt)
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{
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uint64_t current_tick;
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uint64_t usecs_elapsed;
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if (!mono_counter.initialized) {
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init_timer();
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mono_counter.last_value = mct_raw_value();
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mono_counter.initialized = 1;
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}
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current_tick = mct_raw_value();
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usecs_elapsed = (current_tick - mono_counter.last_value) /
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clocks_per_usec;
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/* Update current time and tick values only if a full tick occurred. */
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if (usecs_elapsed) {
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mono_time_add_usecs(&mono_counter.time, usecs_elapsed);
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mono_counter.last_value = current_tick;
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}
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/* Save result. */
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*mt = mono_counter.time;
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}
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