67 lines
2 KiB
C
67 lines
2 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <spi-generic.h>
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#include <spi_flash.h>
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#include <console/spi.h>
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void spiconsole_init(void) {
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spi_init();
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return;
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}
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/*
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* The EM100 'hyper terminal' specification defines a header of 9 characters.
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* Because of this, devices with a spi_crop_chunk of less than 10 characters
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* can't be supported by this standard.
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*
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* To add support in romstage, the static struct here and the ones used by
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* spi_xfer will need to be modified - removed, or mapped into cbmem.
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*
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* Because the Dediprog software expects strings, not single characters, and
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* because of the header overhead, this builds up a buffer to send.
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*/
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void spiconsole_tx_byte(unsigned char c) {
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static struct em100_msg msg = {
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.header.spi_command = EM100_DEDICATED_CMD,
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.header.em100_command = EM100_UFIFO_CMD,
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.header.msg_signature = EM100_MSG_SIGNATURE,
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.header.msg_type = EM100_MSG_ASCII,
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.header.msg_length = 0
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};
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/* Verify the spi buffer is big enough to send even a single byte */
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if (spi_crop_chunk(0,MAX_MSG_LENGTH) <
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sizeof(struct em100_msg_header) + 1)
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return;
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msg.data[msg.header.msg_length] = c;
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msg.header.msg_length++;
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/* Send the data on newline or when the max spi length is reached */
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if (c == '\n' || (sizeof(struct em100_msg_header) +
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msg.header.msg_length == spi_crop_chunk(0,
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MAX_MSG_LENGTH))) {
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struct spi_slave spi = {.rw = SPI_READ_FLAG};
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spi_xfer(&spi, &msg, sizeof(struct em100_msg_header) +
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msg.header.msg_length, NULL, 0);
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msg.header.msg_length = 0;
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}
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return;
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}
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