86a5575402
The temperature monitor device is enabled to sample the die temperature at 16hz. The temperature is published via sysctl. A callout routine at 10hz monitors the temperature and throttles back the cpu if the temperature goes over a user-settable throttle point (by default 10C less than the critical high-point temperature for the chip). The hardware is supposed to be able to deliver an interrupt when the temperature exceeds a settable limit, but the interrupt never arrives so for now a callout does the job. At attach time we read the maximum cpu frequency the chip is allowed to run at and the cpu is set to run at that speed. It's reported at attach time. A sysctl variable reports the current speed when queried. New sysctl values: dev.imx6_anatop.0.cpu_mhz: 984 dev.imx6_anatop.0.temperature: 37.9C dev.imx6_anatop.0.throttle_temperature: 95.0C Steven Lawrance did the initial heavy lifting on this, but I changed enough stuff that I'm the one to blame if anything breaks. Submitted by: Steven Lawrance <stl@koffein.net>
46 lines
2.0 KiB
C
46 lines
2.0 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef IMX6_ANATOPVAR_H
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#define IMX6_ANATOPVAR_H
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/*
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* All registers controlling various analog aspects of the SoC (such as PLLs or
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* voltage regulators or USB VBUS detection) are gathered together under the
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* anatop device (because of newbus hierarchical resource management), but other
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* drivers such as CMM or USBPHY need access to these registers. These
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* functions let them have at the hardware directly. No effort is made by these
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* functions to mediate concurrent access.
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*/
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uint32_t imx6_anatop_read_4(bus_size_t _offset);
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void imx6_anatop_write_4(bus_size_t _offset, uint32_t _value);
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uint32_t imx6_get_cpu_clock(void);
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#endif
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