eb623ab204
It turns out there's a register in tegra which automatically counts at 1us increments. It's primarily intended for hardware to use (I think to drive other timers) but we can read it ourselves since a 1us timer is exactly what we need to support the monotonic timer API. Change-Id: I68e947944acec7b460e61f42dbb325643a9739e8 Signed-off-by: Gabe Black <gabeblack@google.com> Reviewed-on: https://chromium-review.googlesource.com/172044 Reviewed-by: Ronald Minnich <rminnich@chromium.org> Reviewed-by: David Hendricks <dhendrix@chromium.org> Commit-Queue: Gabe Black <gabeblack@chromium.org> Tested-by: Gabe Black <gabeblack@chromium.org> (cherry picked from commit 161a39c53404ea0125221bbd54e54996967d6855) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6620 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins)
27 lines
933 B
C
27 lines
933 B
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 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 <arch/io.h>
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#include <soc/addressmap.h>
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#include <timer.h>
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void timer_monotonic_get(struct mono_time *mt)
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{
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mono_time_set_usecs(mt, read32((void *)TEGRA_TMRUS_BASE));
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}
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