mb/google/brya/var/baseboard/brask: Add power limits functions

Copy function variant_update_power_limits from brya to set power limits.

Add function variant_update_psys_power_limits and copy the algorithm
from puff. Add structure system_power_limits and psys_config to define
and configure the psys power limits.

BUG=b:193864533
BRANCH=none
TEST=Build pass

Signed-off-by: Alan Huang <alan-huang@quanta.corp-partner.google.com>
Change-Id: I183017068e9c78acb9fa7073c53593d304ba9248
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58241
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc

@@ -4,3 +4,4 @@ romstage-y += memory.c
 romstage-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-y += ramstage.c

src/mainboard/google/brya/variants/baseboard/brask/ramstage.c

@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi_device.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <device/pci_ops.h>
+#include <ec/google/chromeec/ec.h>
+#include <soc/pci_devs.h>
+
+#include <drivers/intel/dptf/chip.h>
+#include <intelblocks/power_limit.h>
+
+WEAK_DEV_PTR(dptf_policy);
+
+#define SET_PSYSPL2(e, w) ((e) * (w) / 100)
+
+static bool get_sku_index(const struct cpu_power_limits *limits, size_t num_entries,
+					size_t *intel_idx, size_t *brask_idx)
+{
+	uint16_t mchid = pci_s_read_config16(PCI_DEV(0, 0, 0), PCI_DEVICE_ID);
+	u8 tdp = get_cpu_tdp();
+	size_t i = 0;
+
+	for (i = 0; i < ARRAY_SIZE(cpuid_to_adl); i++) {
+		if (mchid == cpuid_to_adl[i].cpu_id && tdp == cpuid_to_adl[i].cpu_tdp) {
+			*intel_idx = cpuid_to_adl[i].limits;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(cpuid_to_adl)) {
+		printk(BIOS_ERR, "Cannot find correct intel sku index.\n");
+		return false;
+	}
+
+	for (i = 0; i < num_entries; i++) {
+		if (mchid == limits[i].mchid && tdp == limits[i].cpu_tdp) {
+			*brask_idx = i;
+			break;
+		}
+	}
+
+	if (i == num_entries) {
+		printk(BIOS_ERR, "Cannot find correct brask sku index.\n");
+		return false;
+	}
+
+	return true;
+}
+
+void variant_update_power_limits(const struct cpu_power_limits *limits, size_t num_entries)
+{
+	const struct device *policy_dev;
+	size_t intel_idx, brask_idx;
+	struct drivers_intel_dptf_config *config;
+	struct dptf_power_limits *settings;
+	config_t *conf;
+	struct soc_power_limits_config *soc_config;
+
+	if (!num_entries)
+		return;
+
+	policy_dev = DEV_PTR(dptf_policy);
+	if (!policy_dev)
+		return;
+
+	if (!get_sku_index(limits, num_entries, &intel_idx, &brask_idx))
+		return;
+
+	config = policy_dev->chip_info;
+	settings = &config->controls.power_limits;
+	conf = config_of_soc();
+	soc_config = &conf->power_limits_config[intel_idx];
+	settings->pl1.min_power = limits[brask_idx].pl1_min_power;
+	settings->pl1.max_power = limits[brask_idx].pl1_max_power;
+	settings->pl2.min_power = limits[brask_idx].pl2_min_power;
+	settings->pl2.max_power = limits[brask_idx].pl2_max_power;
+
+	if (soc_config->tdp_pl2_override != 0) {
+		settings->pl2.max_power = soc_config->tdp_pl2_override * 1000;
+		settings->pl2.min_power = settings->pl2.max_power;
+	}
+
+	if (soc_config->tdp_pl4 == 0)
+		soc_config->tdp_pl4 = DIV_ROUND_UP(limits[brask_idx].pl4_power,
+						MILLIWATTS_TO_WATTS);
+
+	printk(BIOS_INFO, "Overriding power limits PL1(mW) (%u, %u) PL2(mW) (%u, %u) PL4 (%u)\n",
+			settings->pl1.min_power,
+			settings->pl1.max_power,
+			settings->pl2.min_power,
+			settings->pl2.max_power,
+			soc_config->tdp_pl4);
+}
+
+void variant_update_psys_power_limits(const struct cpu_power_limits *limits,
+					const struct system_power_limits *sys_limits,
+					size_t num_entries,
+					const struct psys_config *config_psys)
+{
+	struct soc_power_limits_config *soc_config;
+	const struct device *policy_dev;
+	size_t intel_idx, brask_idx;
+	u16 volts_mv, current_ma;
+	enum usb_chg_type type;
+	u32 psyspl2, pl2;
+	u32 pl2_default;
+	config_t *conf;
+	u32 watts;
+	int rv;
+
+	if (!num_entries)
+		return;
+
+	policy_dev = DEV_PTR(dptf_policy);
+	if (!policy_dev)
+		return;
+
+	if (!get_sku_index(limits, num_entries, &intel_idx, &brask_idx))
+		return;
+
+	conf = config_of_soc();
+	soc_config = &conf->power_limits_config[intel_idx];
+	soc_config->tdp_pl4 = 0;
+
+	pl2_default = DIV_ROUND_UP(limits[brask_idx].pl2_max_power, MILLIWATTS_TO_WATTS);
+	rv = google_chromeec_get_usb_pd_power_info(&type, &current_ma, &volts_mv);
+
+	if (rv == 0 && type == USB_CHG_TYPE_PD) {
+		/* Detected USB-PD. Base on max value of adapter */
+		watts = ((u32)current_ma * volts_mv) / 1000000;
+
+		/* set psyspl2 to 97% of adapter rating */
+		psyspl2 = SET_PSYSPL2(config_psys->efficiency, watts);
+
+		/* Limit PL2 if the adapter is with lower capability */
+		pl2 = (psyspl2 > pl2_default) ? pl2_default : psyspl2;
+
+		soc_config->tdp_pl4 = psyspl2;
+	} else {
+		/* Input type is barrel jack */
+		volts_mv = config_psys->bj_volts_mv;
+		psyspl2 = sys_limits[brask_idx].psys_pl2_power;
+		pl2 = pl2_default;
+	}
+
+	/* voltage unit is milliVolts and current is in milliAmps */
+	soc_config->psys_pmax = (u16)(((u32)config_psys->psys_imax_ma * volts_mv) / 1000000);
+	conf->PsysPmax = soc_config->psys_pmax;
+
+	soc_config->tdp_pl2_override = pl2;
+	soc_config->tdp_psyspl2 = psyspl2;
+
+	printk(BIOS_INFO, "Overriding PL2 (%u) PsysPL2 (%u) Psys_Pmax (%u)\n",
+			soc_config->tdp_pl2_override,
+			soc_config->tdp_psyspl2,
+			soc_config->psys_pmax);
+}

src/mainboard/google/brya/variants/baseboard/include/baseboard/variants.h

@@ -37,8 +37,40 @@ struct cpu_power_limits {
 	unsigned int pl4_power;
 };
 
+struct system_power_limits {
+	uint16_t mchid;
+	u8 cpu_tdp;
+	/* PsysPL2 in Watts */
+	unsigned int psys_pl2_power;
+};
+
+struct psys_config {
+	/*
+	 * The efficiency of type-c chargers
+	 * For example, 'efficiency = 97' means setting 97% of max power to account for
+	 * cable loss and FET Rdson loss in the path from the source.
+	 */
+	unsigned int efficiency;
+
+	/* The maximum current maps to the Psys signal */
+	unsigned int psys_imax_ma;
+
+	/* The voltage of barrel jack */
+	unsigned int bj_volts_mv;
+};
+
 /* Modify Power Limit devictree settings during ramstage */
 void variant_update_power_limits(const struct cpu_power_limits *limits,
 				 size_t num_entries);
 
+
+/*
+ * Modify Power Limit and PsysPL devictree settings during ramstage.
+ * Note, this function must be called in front of calling variant_update_power_limits.
+ */
+void variant_update_psys_power_limits(const struct cpu_power_limits *limits,
+					const struct system_power_limits *sys_limits,
+					size_t num_entries,
+					const struct psys_config *config);
+
 #endif /*__BASEBOARD_VARIANTS_H__ */