2c8b0b1373
Skeleton for soc armada38x BUG=chrome-os-partner:47462 TEST=None BRANCH=tot Change-Id: I76f631ee6cdfc90c44727cb20aa960796bc785a5 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: e91cc19468325f005c6ac920bbe27a174c409727 Original-Change-Id: Iac5fc34df1ba18b4515029aa2fcff8f78a5df191 Original-Signed-off-by: Ruilin Hao <rlhao@marvell.com> Original-Reviewed-on: https://chromium-review.googlesource.com/313179 Original-Commit-Ready: Kan Yan <kyan@google.com> Original-Tested-by: Kan Yan <kyan@google.com> Original-Reviewed-by: Kan Yan <kyan@google.com> Reviewed-on: https://review.coreboot.org/13110 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 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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#include <arch/io.h>
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#include <timer.h>
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#include <delay.h>
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#define TIMER_CTRL_REG 0xf1020300
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#define TIMER_RELOAD_REG 0xf1020310
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#define TIMER_REG 0xf1020314
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#define TIMER_RELOAD_VALUE 0xffffffff
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#define MHZ_NUM 25
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void init_timer(void)
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{
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unsigned int reg;
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/* Set the reload timer */
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write32((void *)TIMER_RELOAD_REG, TIMER_RELOAD_VALUE);
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/* Set the initial value to TIMER_RELOAD_VALUE - 1
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* (instead of TIMER_RELOAD_VALUE) to avoid 'fake'
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* overflow being detected in timer_monotonic_get
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* if it's called close enough with 'this' function */
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write32((void *)TIMER_REG, TIMER_RELOAD_VALUE - 1);
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reg = read32((const void *)TIMER_CTRL_REG);
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/* Let it start counting */
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reg |= 0x3;
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write32((void *)TIMER_CTRL_REG, reg);
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}
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void timer_monotonic_get(struct mono_time *mt)
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{
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static uint64_t total_ticks = 0;
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uint64_t overflow = 0;
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uint32_t current_ticks =
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TIMER_RELOAD_VALUE - read32((const void *)TIMER_REG);
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/* Assuming at most one overflow happened since last call */
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if (current_ticks <= total_ticks)
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overflow = 1ULL << 32;
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total_ticks = (((total_ticks + overflow) >> 32) << 32) + current_ticks;
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mono_time_set_usecs(mt, total_ticks / MHZ_NUM);
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}
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