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https://github.com/Telecominfraproject/OpenCellular.git
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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
36 lines
1009 B
C
36 lines
1009 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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/* PECI module for Chrome EC */
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#ifndef __CROS_EC_PECI_H
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#define __CROS_EC_PECI_H
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#include "common.h"
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struct temp_sensor_t;
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/* Initializes the module. */
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int peci_init(void);
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/* Notifies the module the system clock frequency has changed to <freq>. */
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void peci_clock_changed(int freq);
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/* Returns the current CPU temperature in degrees K, or -1 if error.
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*
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* Note that the PECI interface is currently a little flaky; if you get an
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* error, retry a bit later. */
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int peci_get_cpu_temp(void);
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/* Reads the CPU temperature sensor via PECI. This interface is for the
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* temperature sensor module. Returns the temperature in degrees K, or -1 if
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* error. */
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int peci_temp_sensor_get_val(int idx);
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/* Temperature polling of CPU temperature sensor via PECI. */
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int peci_temp_sensor_poll(void);
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#endif /* __CROS_EC_PECI_H */
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