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e9328ac4f6
Add nopll command to turn off the PLL, reducing the system clock to 16Mhz. Signed-off-by: Randall Spangler <rspangler@chromium.org> BUG=chrome-os-partner:8798 TEST=manual boot system press power button to boot x86 temps // should print all temperatures timerinfo timerinfo timerinfo // convince yourself this is counting up at about 1MHz nopll // this drops the system clock to 16MHz temps // should still print all temperatures timerinfo timerinfo timerinfo // should still be counting up at about 1MHz Change-Id: Ie29ceb17af348148bffadf63d60c1b731f4c3f6d
24 lines
611 B
C
24 lines
611 B
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Clocks and power management settings */
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#ifndef __CROS_EC_CLOCK_H
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#define __CROS_EC_CLOCK_H
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#include "common.h"
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/* Set the CPU clocks and PLLs. */
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int clock_init(void);
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/* Returns the current clock frequency in Hz. */
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int clock_get_freq(void);
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/* Wait <cycles> system clock cycles. Simple busy waiting for before
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* clocks/timers are initialized. */
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void clock_wait_cycles(uint32_t cycles);
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#endif /* __CROS_EC_CLOCK_H */
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