soc/intel/adl: Add SKU specific power limits support

Power limits (PL1 and PL2) depend on the specific SKU of the CPU.
By expanding the SoC chip config power_limits_config member to
an array indexed by ADL_*_POWER_LIMITS_*_CORE macros, the
appropriate power limits are applied. Using this the correct
set of power limits are being selected from the array based on
system agent PCI ID. Based on this, chipset.cb file contains
the set of power limits being used by varieties of ADL boards.
These power limit values are as per document 619501.

BUG=None
BRANCH=None
TEST=Built and verified the following console output on below boards
On adlrvp (482):
 CPU PL1 = 28 Watts
 CPU PL2 = 64 Watts
On adlrvp (682):
 CPU PL1 = 45 Watts
 CPU PL2 = 115 Watts
On brya (282):
 CPU PL1 = 15 Watts
 CPU PL2 = 55 Watts

Change-Id: Ic1676e2b4d611cdc85e770f131d5b6d5ecd180be
Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54676
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Selma Bensaid <selma.bensaid@intel.com>

src/mainboard/google/brya/variants/baseboard/devicetree.cb

@@ -20,11 +20,6 @@ chip soc/intel/alderlake
 	# DPTF enable
 	register "dptf_enable" = "1"
 
-	register "power_limits_config" = "{
-		.tdp_pl1_override = 15,
-		.tdp_pl2_override = 55,
-	}"
-
 	# Enable heci communication
 	register "HeciEnabled" = "1"
 

src/mainboard/intel/adlrvp/devicetree.cb

@@ -134,11 +134,6 @@ chip soc/intel/alderlake
 	register "s0ix_enable" = "1"
 	register "dptf_enable" = "1"
 
-	register "power_limits_config" = "{
-		.tdp_pl1_override = 45,
-		.tdp_pl2_override = 56,
-	}"
-
 	register "SerialIoI2cMode" = "{
 		[PchSerialIoIndexI2C0] = PchSerialIoPci,
 		[PchSerialIoIndexI2C1] = PchSerialIoPci,

src/soc/intel/alderlake/chip.h

@@ -17,13 +17,22 @@
 #include <soc/usb.h>
 #include <stdint.h>
 
+/* Types of different SKUs */
+enum soc_intel_alderlake_power_limits {
+	ADL_P_POWER_LIMITS_282_CORE,
+	ADL_P_POWER_LIMITS_482_CORE,
+	ADL_P_POWER_LIMITS_682_CORE,
+	ADL_M_POWER_LIMITS_282_CORE,
+	ADL_POWER_LIMITS_COUNT
+};
+
 struct soc_intel_alderlake_config {
 
 	/* Common struct containing soc config data required by common code */
 	struct soc_intel_common_config common_soc_config;
 
 	/* Common struct containing power limits configuration information */
-	struct soc_power_limits_config power_limits_config;
+	struct soc_power_limits_config power_limits_config[ADL_POWER_LIMITS_COUNT];
 
 	/* Gpio group routed to each dword of the GPE0 block. Values are
 	 * of the form PMC_GPP_[A:U] or GPD. */

src/soc/intel/alderlake/chipset.cb

@@ -1,4 +1,25 @@
 chip soc/intel/alderlake
+
+	register "power_limits_config[ADL_P_POWER_LIMITS_282_CORE]" = "{
+		.tdp_pl1_override = 15,
+		.tdp_pl2_override = 55,
+	}"
+
+	register "power_limits_config[ADL_P_POWER_LIMITS_482_CORE]" = "{
+		.tdp_pl1_override = 28,
+		.tdp_pl2_override = 64,
+	}"
+
+	register "power_limits_config[ADL_P_POWER_LIMITS_682_CORE]" = "{
+		.tdp_pl1_override = 45,
+		.tdp_pl2_override = 115,
+	}"
+
+	register "power_limits_config[ADL_M_POWER_LIMITS_282_CORE]" = "{
+		.tdp_pl1_override = 9,
+		.tdp_pl2_override = 30,
+	}"
+
 	device domain 0 on
 		device gpio 0 alias pch_gpio on end
 		device pci 00.0 alias system_agent on end

src/soc/intel/alderlake/systemagent.c

@@ -6,8 +6,10 @@
  * Chapter number: 3
  */
 
+#include <console/console.h>
 #include <device/device.h>
 #include <device/pci.h>
+#include <device/pci_ids.h>
 #include <delay.h>
 #include <intelblocks/power_limit.h>
 #include <intelblocks/systemagent.h>
@@ -52,6 +54,8 @@ void soc_add_fixed_mmio_resources(struct device *dev, int *index)
 void soc_systemagent_init(struct device *dev)
 {
 	struct soc_power_limits_config *soc_config;
+	struct device *sa;
+	uint16_t sa_pci_id;
 	config_t *config;
 
 	/* Enable Power Aware Interrupt Routing */
@@ -63,7 +67,32 @@ void soc_systemagent_init(struct device *dev)
 	/* Configure turbo power limits 1ms after reset complete bit */
 	mdelay(1);
 	config = config_of_soc();
-	soc_config = &config->power_limits_config;
+
+	/* Get System Agent PCI ID */
+	sa = pcidev_path_on_root(SA_DEVFN_ROOT);
+	sa_pci_id = sa ? pci_read_config16(sa, PCI_DEVICE_ID) : 0xFFFF;
+
+	/* Choose a power limits configuration based on the SoC SKU type,
+	 * differentiated here based on SA PCI ID. */
+	switch (sa_pci_id) {
+	case PCI_DEVICE_ID_INTEL_ADL_P_ID_7:
+		soc_config = &config->power_limits_config[ADL_P_POWER_LIMITS_282_CORE];
+		break;
+	case PCI_DEVICE_ID_INTEL_ADL_P_ID_5:
+		soc_config = &config->power_limits_config[ADL_P_POWER_LIMITS_482_CORE];
+		break;
+	case PCI_DEVICE_ID_INTEL_ADL_P_ID_3:
+		soc_config = &config->power_limits_config[ADL_P_POWER_LIMITS_682_CORE];
+		break;
+	case PCI_DEVICE_ID_INTEL_ADL_M_ID_1:
+		soc_config = &config->power_limits_config[ADL_M_POWER_LIMITS_282_CORE];
+		break;
+	default:
+		printk(BIOS_ERR, "ADL: unknown SA ID: 0x%4x, skipping power limits configuration\n",
+			sa_pci_id);
+		return;
+	}
+
 	set_power_limits(MOBILE_SKU_PL1_TIME_SEC, soc_config);
 }