drivers/intel/fsp2_0: add option to incorporate platform memory version

On Chrome OS systems a memory setting change is needed to be deployed
without updating the FSP blob proper. Under such conditions one needs
to trigger retrain of the memory. For ease of use provide an option,
FSP_PLATFORM_MEMORY_SETTINGS_VERSIONS, which incorproates the SoC
and mainboard memory setting version number into the FSP version
passed to the platform. The lower 8 bits of the FSP version are the
build number which in practice is normally 0. Use those 8 bits to
include the SoC and mainboard memory settings version. When FSP,
SoC, or mainboard memory setting number is bumped a retrain will be
triggered.

BUG=b:37687843

Change-Id: I6a269dcf654be7a409045cedeea3f82eb641f1d6
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/19452
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/drivers/intel/fsp2_0/include/fsp/api.h b/src/drivers/intel/fsp2_0/include/fsp/api.h
index 3532ad2ef8..123db303ca 100644
--- a/src/drivers/intel/fsp2_0/include/fsp/api.h
+++ b/src/drivers/intel/fsp2_0/include/fsp/api.h
@@ -53,6 +53,15 @@ void fsps_load(bool s3wake);
 void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version);
 void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd);
 
+/*
+ * The following functions are used when FSP_PLATFORM_MEMORY_SETTINGS_VERSION
+ * is employed allowing the mainboard and SoC to supply their own version
+ * for memory settings respectively. The valid values are 0-15 for each
+ * function.
+ */
+uint8_t fsp_memory_mainboard_version(void);
+uint8_t fsp_memory_soc_version(void);
+
 /* Callback after processing FSP notify */
 void platform_fsp_notify_status(enum fsp_notify_phase phase);