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