soc/intel/common/block: Manage power state variable from common PMC block

This patch helps managing power state variables from within the
library. Adds migrate_power_state which migrates the chipset
power state variable, reads global power variable and adds it
in cbmem for future use. This also adds get_soc_power_state_values
function which returns the power state variable from cbmem or
global power state variable if cbmem is not populated yet.

Change-Id: If65341c1492e3a35a1a927100e0d893f923b9e68
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/21851
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/include/intelblocks/pmclib.h b/src/soc/intel/common/block/include/intelblocks/pmclib.h
index fe0a7657e3..05a4a06294 100644
--- a/src/soc/intel/common/block/include/intelblocks/pmclib.h
+++ b/src/soc/intel/common/block/include/intelblocks/pmclib.h
@@ -150,6 +150,9 @@ void pmc_global_reset_lock(void);
 /* Rewrite the gpe0 registers in cbmem to proper values as per routing table */
 void pmc_fixup_power_state(void);
 
+/* Returns the power state structure */
+struct chipset_power_state *pmc_get_power_state(void);
+
 /*
  * Reads and prints ACPI specific PM registers which are common across
  * chipsets. Returns the previous sleep state which is one of ACPI_SX values.