diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/spi/Kconfig | 4 | ||||
| -rw-r--r-- | src/drivers/spi/Makefile.inc | 5 | ||||
| -rw-r--r-- | src/drivers/spi/spiconsole.c | 71 |
3 files changed, 80 insertions, 0 deletions
diff --git a/src/drivers/spi/Kconfig b/src/drivers/spi/Kconfig index 4052bb4713..dedb88f664 100644 --- a/src/drivers/spi/Kconfig +++ b/src/drivers/spi/Kconfig @@ -137,3 +137,7 @@ config SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B to the chip on MOSI and data is received on both MOSI and MISO. endif # SPI_FLASH + +config HAVE_SPI_CONSOLE_SUPPORT + def_bool n + diff --git a/src/drivers/spi/Makefile.inc b/src/drivers/spi/Makefile.inc index ade34a2988..6697c702fb 100644 --- a/src/drivers/spi/Makefile.inc +++ b/src/drivers/spi/Makefile.inc @@ -1,5 +1,10 @@ # SPI flash driver interface +ifeq ($(CONFIG_SPI_CONSOLE),y) +ramstage-y += spiconsole.c +smm-$(CONFIG_DEBUG_SMI) += spiconsole.c +endif + ifeq ($(CONFIG_COMMON_CBFS_SPI_WRAPPER),y) bootblock-y += spi_flash.c bootblock-$(CONFIG_SPI_FLASH_EON) += eon.c diff --git a/src/drivers/spi/spiconsole.c b/src/drivers/spi/spiconsole.c new file mode 100644 index 0000000000..39a574c3ca --- /dev/null +++ b/src/drivers/spi/spiconsole.c @@ -0,0 +1,71 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc. + */ + +#include <spi-generic.h> +#include <spi_flash.h> +#include <console/spi.h> + +void spiconsole_init(void) { + spi_init(); + 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(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(0, + MAX_MSG_LENGTH))) { + struct spi_slave spi = {.rw = SPI_READ_FLAG}; + + spi_xfer(&spi, &msg, sizeof(struct em100_msg_header) + + msg.header.msg_length, NULL, 0); + + msg.header.msg_length = 0; + } + + return; +} + |