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BUG=chromium-os:31902 TEST=manual 1. reboot ec 2. port80; nothing there 3. powerbtn 4. retype port80 repeatedly during boot and see it fill and then scroll Change-Id: Id227d5debbdd635332ed2f42bc0f163833031b5c Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/25442 Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
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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#include "board.h"
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#include "console.h"
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#include "port80.h"
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#include "util.h"
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#define CPRINTF(format, args...) cprintf(CC_PORT80, format, ## args)
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#define HISTORY_LEN 16
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static uint8_t history[HISTORY_LEN];
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static int writes; /* Number of port 80 writes so far */
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static int scroll;
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void port_80_write(int data)
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{
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/*
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* Note that this currently prints from inside the LPC interrupt
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* itself. Probably not worth the system overhead to buffer the data
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* and print it from a task, because we're printing a small amount of
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* data and cprintf() doesn't block.
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*/
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CPRINTF("%c[%T Port 80: 0x%02x]", scroll ? '\n' : '\r', data);
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history[writes % ARRAY_SIZE(history)] = data;
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writes++;
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}
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/*****************************************************************************/
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/* Console commands */
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static int command_port80(int argc, char **argv)
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{
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int head, tail;
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int i;
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/*
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* 'port80 scroll' toggles whether port 80 output begins with a newline
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* (scrolling) or CR (non-scrolling).
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*/
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if (argc > 1 && !strcasecmp(argv[1], "scroll")) {
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scroll = !scroll;
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ccprintf("scroll %sabled\n", scroll ? "en" : "dis");
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return EC_SUCCESS;
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}
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/*
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* Print the port 80 writes so far, clipped to the length of our
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* history buffer.
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*
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* Technically, if a port 80 write comes in while we're printing this,
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* we could print an incorrect history. Probably not worth the
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* complexity to work around that.
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*/
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head = writes;
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if (head > ARRAY_SIZE(history))
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tail = head - ARRAY_SIZE(history);
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else
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tail = 0;
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for (i = tail; i < head; i++)
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ccprintf(" %02x", history[i % ARRAY_SIZE(history)]);
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ccputs(" <--new\n");
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(port80, command_port80,
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"[scroll]",
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"Print port80 writes or toggle port80 scrolling",
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NULL);
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