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spi: Add function to read flash status register

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Add a function that allows reading of the status register
from the SPI chip.  This can be used to determine whether
write protection is enabled on the chip.

BUG=chrome-os-partner:35209
BRANCH=haswell
TEST=build and boot on peppy

Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/240702
Reviewed-by: Shawn N <shawnn@chromium.org>
(cherry picked from commit c58f17689162b291a7cdb57649a237de21b73545)

Change-Id: Ib7fead2cc4ea4339ece322dd18403362c9c79c7d
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 9fbdf0d72892eef4a742a418a347ecf650c01ea5
Original-Change-Id: I2541b22c51e43f7b7542ee0f48618cf411976a98
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/241128
Original-Reviewed-by: Shawn N <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/9730
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Duncan Laurie
2015-01-15 15:28:46 -08:00
committed by Patrick Georgi
parent 1968b58010
commit fb032398d2
9 changed files with 24 additions and 0 deletions
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2
src/drivers/spi/gigadevice.c
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@ -222,6 +222,7 @@ struct spi_flash *spi_flash_probe_gigadevice(struct spi_slave *spi, u8 *idcode)
stm.flash.write = gigadevice_write;
stm.flash.erase = spi_flash_cmd_erase;
stm.flash.status = spi_flash_cmd_status;
#if CONFIG_SPI_FLASH_NO_FAST_READ
stm.flash.read = spi_flash_cmd_read_slow;
#else
@ -233,6 +234,7 @@ struct spi_flash *spi_flash_probe_gigadevice(struct spi_slave *spi, u8 *idcode)
* params->sectors_per_block
* params->nr_blocks;
stm.flash.erase_cmd = CMD_GD25_SE;
stm.flash.status_cmd = CMD_GD25_RDSR;
return &stm.flash;
}