drivers/intel/dptf: Add support for PROP method

Add PROP method under \_SB.DPTF.TPWR scope which will return static
worst case rest of platform power in miliWatts.

This value is static, which has to configured from devicetree of
overridetree for each platform

BUG=b:205928013
TEST=Build, boot brya0 and dump SSDT to check PROP method

Scope (\_SB)
{
    Device (DPTF)
    {
        Device (TPWR)
        {
            Method (PROP, 0, Serialized)
            {
                Return (XXXX)
            }
        }
    }
}

Signed-off-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Change-Id: I1415d2a9eb55cfadc3a7b41b53ecbec657002759
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63697
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

2 files changed, 17 insertions, 4 deletions

diff --git a/src/drivers/intel/dptf/chip.h b/src/drivers/intel/dptf/chip.h
index 59b1e251b3..060f19699d 100644
--- a/src/drivers/intel/dptf/chip.h
+++ b/src/drivers/intel/dptf/chip.h
@@ -59,6 +59,9 @@ struct drivers_intel_dptf_config {
 	struct {
 		uint32_t oem_variables[DPTF_OEM_VARIABLE_COUNT];
 	} oem_data;
+
+	/* Rest of platform Power */
+	uint32_t prop;
 };
 
 #endif /* _DRIVERS_INTEL_DPTF_CHIP_H_ */
diff --git a/src/drivers/intel/dptf/dptf.c b/src/drivers/intel/dptf/dptf.c
index 27c713313b..3cfd23c1d8 100644
--- a/src/drivers/intel/dptf/dptf.c
+++ b/src/drivers/intel/dptf/dptf.c
@@ -372,7 +372,8 @@ static void write_tpch_methods(const struct dptf_platform_info *platform_info)
 	acpigen_write_device_end(); /* TPCH Device */
 }
 
-static void write_create_tpwr(const struct dptf_platform_info *platform_info)
+static void write_create_tpwr(const struct drivers_intel_dptf_config *config,
+			      const struct dptf_platform_info *platform_info)
 {
 	acpigen_write_device("TPWR");
 	acpigen_write_name("_HID");
@@ -382,12 +383,21 @@ static void write_create_tpwr(const struct dptf_platform_info *platform_info)
 	acpigen_write_name_string("_STR", DEFAULT_POWER_STR);
 	acpigen_write_name_integer("PTYP", DPTF_GENERIC_PARTICIPANT_TYPE_POWER);
 	acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
+
+	/* PROP method */
+	if(config->prop != 0) {
+		acpigen_write_method_serialized("PROP", 0);
+		acpigen_emit_byte(RETURN_OP);
+		acpigen_write_integer(config->prop);
+		acpigen_pop_len(); /* Method PROP */
+	}
 	acpigen_write_device_end(); /* TPWR Power Participant Device */
 }
 
-static void write_tpwr_methods(const struct dptf_platform_info *platform_info)
+static void write_tpwr_methods(const struct drivers_intel_dptf_config *config,
+			       const struct dptf_platform_info *platform_info)
 {
-	write_create_tpwr(platform_info);
+	write_create_tpwr(config, platform_info);
 }
 
 static void write_create_tbat(const struct dptf_platform_info *platform_info)
@@ -449,7 +459,7 @@ static void write_device_definitions(const struct device *dev)
 		write_tpch_methods(platform_info);
 
 	if (CONFIG(DRIVERS_INTEL_DPTF_SUPPORTS_TPWR))
-		write_tpwr_methods(platform_info);
+		write_tpwr_methods(config, platform_info);
 
 	if (CONFIG(DRIVERS_INTEL_DPTF_SUPPORTS_TBAT))
 		write_tbat_methods(platform_info);