| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #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); |
| } |
| |
| /* |
| * 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; |
| } |
| } |