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Diffstat (limited to 'payloads/libpayload/drivers/timer/generic.c')
-rw-r--r--payloads/libpayload/drivers/timer/generic.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/timer/generic.c b/payloads/libpayload/drivers/timer/generic.c
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index 0000000000..4c066182fc
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+++ b/payloads/libpayload/drivers/timer/generic.c
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+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <libpayload.h>
+
+uint64_t timer_hz(void)
+{
+ /* libc/time.c currently requires all timers to be at least 1MHz. */
+ assert(CONFIG_LP_TIMER_GENERIC_HZ >= 1000000);
+ return CONFIG_LP_TIMER_GENERIC_HZ;
+}
+
+uint64_t timer_raw_value(void)
+{
+ uint64_t cur_tick;
+ uint32_t count_h;
+ uint32_t count_l;
+
+ if (!CONFIG_LP_TIMER_GENERIC_HIGH_REG)
+ return readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
+
+ do {
+ count_h = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG));
+ count_l = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
+ cur_tick = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
+ } while (cur_tick != count_h);
+
+ return (cur_tick << 32) + count_l;
+}