1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <spi-generic.h>
4 #include <spi_flash.h>
5 #include <console/spi.h>
6
7 static struct spi_slave slave;
8
spiconsole_init(void)9 void spiconsole_init(void) {
10 spi_init();
11 spi_setup_slave(0, 0, &slave);
12 }
13
14 /*
15 * The EM100 'hyper terminal' specification defines a header of 9 characters.
16 * Because of this, devices with a spi_crop_chunk of less than 10 characters
17 * can't be supported by this standard.
18 *
19 * To add support in romstage, the static struct here and the ones used by
20 * spi_xfer will need to be modified - removed, or mapped into cbmem.
21 *
22 * Because the Dediprog software expects strings, not single characters, and
23 * because of the header overhead, this builds up a buffer to send.
24 */
spiconsole_tx_byte(unsigned char c)25 void spiconsole_tx_byte(unsigned char c) {
26 static struct em100_msg msg = {
27 .header.spi_command = EM100_DEDICATED_CMD,
28 .header.em100_command = EM100_UFIFO_CMD,
29 .header.msg_signature = EM100_MSG_SIGNATURE,
30 .header.msg_type = EM100_MSG_ASCII,
31 .header.msg_length = 0
32 };
33
34 /* Verify the spi buffer is big enough to send even a single byte */
35 if (spi_crop_chunk(&slave, 0, MAX_MSG_LENGTH) <
36 sizeof(struct em100_msg_header) + 1)
37 return;
38
39 msg.data[msg.header.msg_length] = c;
40 msg.header.msg_length++;
41
42 /* Send the data on newline or when the max spi length is reached */
43 if (c == '\n' || (sizeof(struct em100_msg_header) +
44 msg.header.msg_length == spi_crop_chunk(&slave, 0,
45 MAX_MSG_LENGTH))) {
46 spi_xfer(&slave, &msg, sizeof(struct em100_msg_header) +
47 msg.header.msg_length, NULL, 0);
48
49 msg.header.msg_length = 0;
50 }
51 }
52