src/soc/intel/alderlake/vr_config.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <fsp/api.h>
#include <soc/ramstage.h>
#include <soc/vr_config.h>
#include <console/console.h>
#include <intelblocks/cpulib.h>

/*
 * VR Configurations for IA and GT domains for ADL-P SKU's.
 *
 * +----------------+-----------+-------+-------+---------+-------------+----------+
 * |      SKU       | Setting   | AC LL | DC LL | ICC MAX | TDC Current | TDC Time |
 * |                |           |(mOhms)|(mOhms)|   (A)   |     (A)     |   (msec) |
 * +----------------+-----------+-------+-------+---------+-------------+----------+
 * | ADL-P 682(45W) |    IA     |  2.3  |  2.3  |   160   |      57     |  28000   |
 * +                +-----------+-------+-------+---------+-------------+----------+
 * |                |    GT     |  3.2  |  3.2  |    50   |      57     |  28000   |
 * +----------------+-----------+-------+-------+---------+-------------+----------+
 * | ADL-P 482(28W) |    IA     |  2.3  |  2.3  |   109   |      40     |  28000   |
 * +                +-----------+-------+-------+---------+-------------+----------+
 * |                |    GT     |  3.2  |  3.2  |    50   |      40     |  28000   |
 * +----------------+-----------+-------+-------+---------+-------------+----------+
 * | ADL-P 282(15W) |    IA     |  2.8  |  2.8  |    80   |      20     |  28000   |
 * +                +-----------+-------+-------+---------+-------------+----------+
 * |                |    GT     |  3.2  |  3.2  |    40   |      20     |  28000   |
 * +----------------+-----------+-------+-------+---------+-------------+----------+
 */

struct vr_lookup {
	uint16_t mchid;
	uint32_t conf[NUM_VR_DOMAINS];
};

static uint32_t load_table(const struct vr_lookup *tbl, const int tbl_entries, const int domain,
					const uint16_t mch_id)
{
	for (size_t i = 0; i < tbl_entries; i++) {
		if (tbl[i].mchid != mch_id)
			continue;
		return tbl[i].conf[domain];
	}

	printk(BIOS_ERR, "ERROR: Unknown MCH (0x%x) in %s\n", mch_id, __func__);
	return 0;
}

static const struct vr_lookup vr_config_ll[] = {
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_3, VR_CFG_ALL_DOMAINS_LOADLINE(2.3, 3.2) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_5, VR_CFG_ALL_DOMAINS_LOADLINE(2.3, 3.2) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_7, VR_CFG_ALL_DOMAINS_LOADLINE(2.8, 3.2) },
};

static const struct vr_lookup vr_config_icc[] = {
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_3, VR_CFG_ALL_DOMAINS_ICC(160, 50) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_5, VR_CFG_ALL_DOMAINS_ICC(109, 50) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_7, VR_CFG_ALL_DOMAINS_ICC(80, 40) },
};

static const struct vr_lookup vr_config_tdc_timewindow[] = {
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_3, VR_CFG_ALL_DOMAINS_TDC(28000, 28000) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_5, VR_CFG_ALL_DOMAINS_TDC(28000, 28000) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_7, VR_CFG_ALL_DOMAINS_TDC(28000, 28000) },
};

static const struct vr_lookup vr_config_tdc_currentlimit[] = {
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_3, VR_CFG_ALL_DOMAINS_TDC_CURRENT(57, 57) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_5, VR_CFG_ALL_DOMAINS_TDC_CURRENT(40, 40) },
	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_7, VR_CFG_ALL_DOMAINS_TDC_CURRENT(20, 20) },
};

void fill_vr_domain_config(FSP_S_CONFIG *s_cfg,
		int domain, const struct vr_config *chip_cfg)
{
	const struct vr_config *cfg;

	if (domain < 0 || domain >= NUM_VR_DOMAINS)
		return;

	/* Use device tree override if requested */
	if (chip_cfg->vr_config_enable) {
		cfg = chip_cfg;

		s_cfg->AcLoadline[domain] = cfg->ac_loadline;
		s_cfg->DcLoadline[domain] = cfg->dc_loadline;
		s_cfg->IccMax[domain] = cfg->icc_max;
		s_cfg->TdcTimeWindow[domain] = cfg->tdc_timewindow;
		s_cfg->TdcCurrentLimit[domain] = cfg->tdc_currentlimit;
	} else {
		uint16_t mch_id = 0;

		if (!mch_id) {
			struct device *dev = pcidev_path_on_root(SA_DEVFN_ROOT);
			mch_id = dev ? pci_read_config16(dev, PCI_DEVICE_ID) : 0xffff;
		}

		s_cfg->AcLoadline[domain] = load_table(vr_config_ll, ARRAY_SIZE(vr_config_ll),
							domain, mch_id);
		s_cfg->DcLoadline[domain] = load_table(vr_config_ll, ARRAY_SIZE(vr_config_ll),
							domain, mch_id);
		s_cfg->IccMax[domain] = load_table(vr_config_icc, ARRAY_SIZE(vr_config_icc),
							domain, mch_id);
		s_cfg->TdcTimeWindow[domain] = load_table(vr_config_tdc_timewindow,
							ARRAY_SIZE(vr_config_tdc_timewindow),
							domain, mch_id);
		s_cfg->TdcCurrentLimit[domain] = load_table(vr_config_tdc_currentlimit,
							ARRAY_SIZE(vr_config_tdc_currentlimit),
							domain, mch_id);
	}

	/* Check TdcTimeWindow and TdcCurrentLimit,
	   Set TdcEnable and Set VR TDC Input current to root mean square */
	if (s_cfg->TdcTimeWindow[domain] != 0 && s_cfg->TdcCurrentLimit[domain] != 0) {
		s_cfg->TdcEnable[domain] = 1;
		s_cfg->Irms[domain] = 1;
	}
}