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authorDuncan Laurie <dlaurie@chromium.org>2017-08-15 13:32:26 -0700
committerDuncan Laurie <dlaurie@chromium.org>2017-08-17 18:31:07 +0000
commitdc1e6bc2774e0fad2eec31d281c4e3ed22c16fe7 (patch)
tree1ad492ffc9f14eec3efbb4fd3addea6c79dc22be /src/soc/intel
parenta102a029c5706a97ca1df6f0939def49b851a656 (diff)
intel/common/block/fast_spi: Add config option to disable write status
Chrome OS systems rely on the write status register to enable/disable flash write protection and disabling this opcode breaks the ability to enable or disable write protection with flashrom. Add a configure option for this feature that will disable the opcode for Write Status commands unless CONFIG_CHROMEOS is enabled. Tested to ensure that a default build without CONFIG_CHROMEOS has this option enabled while a build with CONFIG_CHROMEOS does not. Also ensured that when this option is disabled (for Chrome OS) then flashrom can be used with the --wp-enable and --wp-disable commands, depending on the state of the external write protect pin. Change-Id: Ia2ef3c3b1e10fba2c437e083f3537022f1fce84a Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://review.coreboot.org/21021 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Diffstat (limited to 'src/soc/intel')
-rw-r--r--src/soc/intel/common/block/fast_spi/Kconfig8
-rw-r--r--src/soc/intel/common/block/fast_spi/fast_spi.c5
2 files changed, 12 insertions, 1 deletions
diff --git a/src/soc/intel/common/block/fast_spi/Kconfig b/src/soc/intel/common/block/fast_spi/Kconfig
index 87edb92095..4bd1f59de6 100644
--- a/src/soc/intel/common/block/fast_spi/Kconfig
+++ b/src/soc/intel/common/block/fast_spi/Kconfig
@@ -2,3 +2,11 @@ config SOC_INTEL_COMMON_BLOCK_FAST_SPI
bool
help
Intel Processor common FAST_SPI support
+
+config FAST_SPI_DISABLE_WRITE_STATUS
+ bool "Disable write status SPI opcode"
+ depends on SOC_INTEL_COMMON_BLOCK_FAST_SPI
+ default n if CHROMEOS
+ default y
+ help
+ Disable the write status SPI opcode in Intel Fast SPI block.
diff --git a/src/soc/intel/common/block/fast_spi/fast_spi.c b/src/soc/intel/common/block/fast_spi/fast_spi.c
index fe0217adad..f7ef68561f 100644
--- a/src/soc/intel/common/block/fast_spi/fast_spi.c
+++ b/src/soc/intel/common/block/fast_spi/fast_spi.c
@@ -144,7 +144,10 @@ void fast_spi_set_opcode_menu(void)
void fast_spi_lock_bar(void)
{
void *spibar = fast_spi_get_bar();
- const uint16_t hsfs = SPIBAR_HSFSTS_FLOCKDN | SPIBAR_HSFSTS_WRSDIS;
+ uint16_t hsfs = SPIBAR_HSFSTS_FLOCKDN;
+
+ if (IS_ENABLED(CONFIG_FAST_SPI_DISABLE_WRITE_STATUS))
+ hsfs |= SPIBAR_HSFSTS_WRSDIS;
write16(spibar + SPIBAR_HSFSTS_CTL, hsfs);
}