common/block/imc: Add Integrated Memory Controller (IMC) driver

IMC is found on certain Xeon processors. On such platforms SPDs are not
connected to SMBus on PCH but to dedicated IMC-owned pins. The purpose
of this driver is to expose access to the i2c/smbus controller associated
with IMC.

Datasheet used: Intel Xeon Processor D-1500 Product Family, Volume 2,
reference 332051-001

This driver is largely based on i2c-imc.c Linux driver.
https://lwn.net/Articles/685475/

TEST=single/double reads and single writes on Xeon-D1500.
Hardware: Open Compute Project Monolake platform.

Signed-off-by: Andrey Petrov <anpetrov@fb.com>
Change-Id: Idbcda1c2273b9a5721fcd9470b4de182192779e7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34678
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/imc/Makefile.inc b/src/soc/intel/common/block/imc/Makefile.inc
new file mode 100644
index 0000000000..a6bc985eb2
--- /dev/null
+++ b/src/soc/intel/common/block/imc/Makefile.inc
@@ -0,0 +1,9 @@
+ifeq ($(CONFIG_SOC_INTEL_COMMON_BLOCK_IMC),y)
+
+bootblock-y += imc.c
+romstage-y += imc.c
+verstage-y += imc.c
+postcar-y += imc.c
+ramstage-y += imc.c
+
+endif