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590caace95
The port 80 task just polls every 1ms until disabled when the system goes into suspend. Therefore, this commit configures a 1ms timer interrupt that will be used for the port 80 writes instead of using an entire task. This saves task stack space as well as context switches. BUG=chrome-os-partner:46062 BUG=chrome-os-partner:46063 BRANCH=None TEST=Flash GLaDOS and verify using the `port80' console comamnd that there are bytes in the port80 history. TEST=make -j buildall tests Change-Id: I65b48217a638c1f6ae1ac86471f9a98e0ec4533a Signed-off-by: Aseda Aboagye <aaboagye@google.com> Reviewed-on: https://chromium-review.googlesource.com/305591 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Kevin K Wong <kevin.k.wong@intel.com> Reviewed-by: Shawn N <shawnn@chromium.org>
35 lines
843 B
C
35 lines
843 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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/* Port 80 module for Chrome EC */
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#ifndef __CROS_EC_PORT80_H
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#define __CROS_EC_PORT80_H
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#include "common.h"
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enum port_80_event {
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PORT_80_EVENT_RESUME = 0x1001, /* S3->S0 transition */
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PORT_80_EVENT_RESET = 0x1002, /* RESET transition */
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PORT_80_IGNORE = 0xffff, /* Invalid POST CODE */
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};
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/**
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* Store data from a LPC write to port 80, or a port_80_event code.
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*
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* @param data Data written to port 80.
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*/
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void port_80_write(int data);
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/**
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* Chip specific function to read from port 80.
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*
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* @return data from the last LPC write to port 80,
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* or PORT_80_IGNORE if no data is available.
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*/
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int port_80_read(void);
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#endif /* __CROS_EC_PORT80_H */
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