drivers/intel/dptf: Add multiple fan support under dptf

Add multiple fan support for dptf policies

BUG=b:235254828
BRANCH=None
TEST=Built and tested on Redrix system for two fans

Change-Id: I96ead90e3b805bd20de03e4bef4fa4b9fbaaaedd
Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65611
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/ec/google/chromeec/acpi/emem.asl

@@ -16,6 +16,7 @@ TIN8, 8,	// Temperature 8
 TIN9, 8,	// Temperature 9
 Offset (0x10),
 FAN0, 16,	// Fan Speed 0
+FAN1, 16,	// Fan Speed 1
 Offset (0x24),
 BTVR, 8,	// Battery structure version
 Offset (0x30),

src/ec/google/chromeec/chip.h

@@ -12,6 +12,7 @@ struct ec_google_chromeec_config {
 	/* Pointer to PMC Mux connector for each Type-C port */
 	DEVTREE_CONST struct device *mux_conn[MAX_TYPEC_PORTS];
 	DEVTREE_CONST struct device *retimer_conn[MAX_TYPEC_PORTS];
+	bool ec_multifan_support;
 };
 
 #endif /* EC_GOOGLE_CHROMEEC_CHIP_H */

src/ec/google/chromeec/ec_acpi.c

@@ -276,7 +276,7 @@ void google_chromeec_fill_ssdt_generator(const struct device *dev)
 	ec->ops = &ec_ops;
 
 	if (CONFIG(DRIVERS_INTEL_DPTF))
-		ec_fill_dptf_helpers(ec);
+		ec_fill_dptf_helpers(ec, dev);
 
 	fill_ssdt_typec_device(dev);
 	fill_ssdt_ps2_keyboard(dev);

src/ec/google/chromeec/ec_dptf_helpers.c

@@ -3,7 +3,9 @@
 #include <acpi/acpigen.h>
 #include <acpi/acpigen_dptf.h>
 #include <ec/google/common/dptf.h>
+#include <drivers/intel/dptf/chip.h>
 
+#include "chip.h"
 /*
  * The Chrome EC is typically in charge of many system functions, including battery charging and
  * fan PWM control. This places it in the middle of a DPTF implementation and therefore, many of
@@ -22,6 +24,19 @@ enum {
 	EC_FAN_DUTY_AUTO		= 0xFF,
 };
 
+/* Return the fan number as a string for the FAN participant */
+static const char *fan_num_namestring_of(enum dptf_participant participant)
+{
+	switch (participant) {
+	case DPTF_FAN:
+		return "FAN0";
+	case DPTF_FAN_2:
+		return "FAN1";
+	default:
+		return "";
+	}
+}
+
 static void write_charger_PPPC(const struct device *ec)
 {
 	acpigen_write_method_serialized("PPPC", 0);
@@ -91,7 +106,7 @@ static void write_charger_SPPC(const struct device *ec)
 	acpigen_pop_len(); /* Method */
 }
 
-static void write_fan_fst(const struct device *ec)
+static void write_fan_fst(const struct device *ec, int participant)
 {
 	/* TFST is a package that is used to store data from FAND */
 	acpigen_write_name("TFST");
@@ -110,7 +125,7 @@ static void write_fan_fst(const struct device *ec)
 	acpigen_write_integer(1);
 	acpigen_emit_byte(ZERO_OP); /* 3rd arg to Index */
 	acpigen_write_store();
-	acpigen_emit_namestring(acpi_device_path_join(ec, "FAN0"));
+	acpigen_emit_namestring(acpi_device_path_join(ec, fan_num_namestring_of(participant)));
 	acpigen_emit_byte(INDEX_OP);
 	acpigen_emit_namestring("TFST");
 	acpigen_write_integer(2);
@@ -300,11 +315,11 @@ static void write_charger_methods(const struct device *ec)
 	acpigen_pop_len(); /* Scope */
 }
 
-static void write_fan_methods(const struct device *ec)
+static void write_fan_methods(const struct device *ec, int participant)
 {
-	dptf_write_scope(DPTF_FAN);
+	dptf_write_scope(participant);
 	write_fan_fsl(ec);
-	write_fan_fst(ec);
+	write_fan_fst(ec, participant);
 	acpigen_pop_len(); /* Scope */
 }
 
@@ -352,14 +367,20 @@ static void write_thermal_methods(const struct device *ec, enum dptf_participant
 	acpigen_pop_len(); /* Scope */
 }
 
-void ec_fill_dptf_helpers(const struct device *ec)
+void ec_fill_dptf_helpers(const struct device *ec, const struct device *fan_dev)
 {
 	enum dptf_participant p;
 	int i;
+	struct ec_google_chromeec_config *config = fan_dev->chip_info;
 
 	write_dppm_methods(ec);
 	write_charger_methods(ec);
-	write_fan_methods(ec);
+
+	if (config->ec_multifan_support) {
+		for (p = DPTF_FAN; p <= DPTF_FAN_2; ++p)
+			write_fan_methods(ec, p);
+	} else
+		write_fan_methods(ec, DPTF_FAN);
 
 	for (p = DPTF_TEMP_SENSOR_0, i = 0; p <= DPTF_TEMP_SENSOR_4; ++p, ++i)
 		write_thermal_methods(ec, p, i);

src/ec/google/common/dptf.h

@@ -6,6 +6,6 @@
 #include <device/device.h>
 
 /* Called by google_chromeec_fill_ssdt_generator */
-void ec_fill_dptf_helpers(const struct device *dev);
+void ec_fill_dptf_helpers(const struct device *dev, const struct device *fan_dev);
 
 #endif /* EC_GOOGLE_COMMON_DPTF_H */