broadwell: Decouple LPDDR3 DQ/DQS maps from `pei_data`

Introduce the `BROADWELL_LPDDR3` Kconfig option along with some wrapper
code to allow mainboards using LPDDR3 DRAM to supply the DQ/DQS maps to
chipset code without having to use `pei_data`. The only mainboard using
LPDDR3 is Google Samus.

Change-Id: I0aaf0ace243c03600430c2a7ab6389a7b20cb432
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55812
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/soc/intel/broadwell/include/soc/pei_wrapper.h b/src/soc/intel/broadwell/include/soc/pei_wrapper.h
index 80222beccd..cf85c044be 100644
--- a/src/soc/intel/broadwell/include/soc/pei_wrapper.h
+++ b/src/soc/intel/broadwell/include/soc/pei_wrapper.h
@@ -33,9 +33,17 @@ struct spd_info {
 	unsigned int spd_index;
 };
 
+struct lpddr3_dq_dqs_map {
+	uint8_t dq[2][6][2];
+	uint8_t dqs[2][8];
+};
+
 /* Mainboard callback to fill in the SPD addresses */
 void mb_get_spd_map(struct spd_info *spdi);
 
+/* Mainboard callback to retrieve the LPDDR3-specific DQ/DQS mapping */
+const struct lpddr3_dq_dqs_map *mb_get_lpddr3_dq_dqs_map(void);
+
 void broadwell_fill_pei_data(struct pei_data *pei_data);
 void mainboard_fill_pei_data(struct pei_data *pei_data);