diff options
author | Gabe Black <gabeblack@google.com> | 2013-05-16 05:45:57 -0700 |
---|---|---|
committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2013-07-10 20:08:53 +0200 |
commit | 607c0b6d63f88c84661582800f2ee9a49325fcdb (patch) | |
tree | 9b26c0530ee09ef661610fb1faef2a1813e3da6c /src/cpu/samsung/exynos5420/monotonic_timer.c | |
parent | dc006c1db4fa3606d657c78cc87dc13d056e970d (diff) |
pit: Create an exynos5420 directory which is nearly a copy of exynos5250.
This change creates an exynos5420 directory with code that will eventually
implement support for the exynos5420 cpu from Samsung. Currently it's a copy
of the exynos5250 directory with the name changed. There are going to be some
problems where headers in src/cpu/samsung/exynos-common include headers in the
exynos5250 directory directly.
Change-Id: Ia8d7244310d32499238bbc171c0c668ec48178e1
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3644
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/samsung/exynos5420/monotonic_timer.c')
-rw-r--r-- | src/cpu/samsung/exynos5420/monotonic_timer.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/cpu/samsung/exynos5420/monotonic_timer.c b/src/cpu/samsung/exynos5420/monotonic_timer.c new file mode 100644 index 0000000000..6350af536f --- /dev/null +++ b/src/cpu/samsung/exynos5420/monotonic_timer.c @@ -0,0 +1,57 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include <delay.h> +#include <timer.h> + +#include "clk.h" + +static struct monotonic_counter { + int initialized; + struct mono_time time; + uint64_t last_value; +} mono_counter; + +static const uint32_t clocks_per_usec = MCT_HZ/1000000; + +void timer_monotonic_get(struct mono_time *mt) +{ + uint64_t current_tick; + uint64_t usecs_elapsed; + + if (!mono_counter.initialized) { + init_timer(); + mono_counter.last_value = mct_raw_value(); + mono_counter.initialized = 1; + } + + current_tick = mct_raw_value(); + usecs_elapsed = (current_tick - mono_counter.last_value) / + clocks_per_usec; + + /* Update current time and tick values only if a full tick occurred. */ + if (usecs_elapsed) { + mono_time_add_usecs(&mono_counter.time, usecs_elapsed); + mono_counter.last_value = current_tick; + } + + /* Save result. */ + *mt = mono_counter.time; +} |