src/mainboard/google/poppy/variants/nautilus/mainboard.c

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

#include <baseboard/variants.h>
#include <chip.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci_ops.h>
#include <smbios.h>
#include <stdio.h>
#include <string.h>
#include <variant/sku.h>

#define R_PCH_OC_WDT_CTL		0x54
#define B_PCH_OC_WDT_CTL_FORCE_ALL	BIT15
#define B_PCH_OC_WDT_CTL_EN		BIT14
#define B_PCH_OC_WDT_CTL_UNXP_RESET_STS	BIT22

const char *smbios_system_sku(void)
{
	static char sku_str[5]; /* sku{0-1} */

	snprintf(sku_str, sizeof(sku_str), "sku%u", variant_board_sku());

	return sku_str;
}

/* Override dev tree settings per board */
void variant_devtree_update(void)
{
	uint32_t sku_id = variant_board_sku();
	uint16_t abase;
	uint32_t val32;

	config_t *cfg = config_of_soc();

	switch (sku_id) {
	case SKU_0_NAUTILUS:
		/* Disable LTE module */
		cfg->usb3_ports[3].enable = 0;

		/* OC_WDT has been enabled in FSP-M by enabling SaOcSupport.
		 * We should clear it to prevent turning the system off. */
		abase = pci_read_config16(PCH_DEV_PMC, ABASE) & 0xfffc;
		val32 = inl(abase + R_PCH_OC_WDT_CTL);
		val32 &= ~(B_PCH_OC_WDT_CTL_EN |
			B_PCH_OC_WDT_CTL_FORCE_ALL |
			B_PCH_OC_WDT_CTL_UNXP_RESET_STS);
		outl(val32, abase + R_PCH_OC_WDT_CTL);
		break;

	case SKU_1_NAUTILUS_LTE:
		/* LTE board has different layout with Wifi sku, it need
		   new USB2 port strength settings */

		/* Configure USB2 port 0 - USB2_PORT_TYPE_C(OC1) */
		cfg->usb2_ports[0].enable = 1;
		cfg->usb2_ports[0].ocpin = OC1;
		cfg->usb2_ports[0].tx_bias = USB2_BIAS_0MV;
		cfg->usb2_ports[0].tx_emp_enable = USB2_PRE_EMP_ON;
		cfg->usb2_ports[0].pre_emp_bias = USB2_BIAS_56MV;
		cfg->usb2_ports[0].pre_emp_bit = USB2_HALF_BIT_PRE_EMP;

		/* Configure USB2 port 1 - USB2_PORT_LONG(OC2) */
		cfg->usb2_ports[1].enable = 1;
		cfg->usb2_ports[1].ocpin = OC2;
		cfg->usb2_ports[1].tx_bias = USB2_BIAS_39MV;
		cfg->usb2_ports[1].tx_emp_enable = USB2_PRE_EMP_ON;
		cfg->usb2_ports[1].pre_emp_bias = USB2_BIAS_56MV;
		cfg->usb2_ports[1].pre_emp_bit = USB2_HALF_BIT_PRE_EMP;

		/* Configure USB2 port 4 - USB2_PORT_TYPE_C(OC0) */
		cfg->usb2_ports[4].enable = 1;
		cfg->usb2_ports[4].ocpin = OC0;
		cfg->usb2_ports[4].tx_bias = USB2_BIAS_0MV;
		cfg->usb2_ports[4].tx_emp_enable = USB2_PRE_EMP_ON;
		cfg->usb2_ports[4].pre_emp_bias = USB2_BIAS_56MV;
		cfg->usb2_ports[4].pre_emp_bit = USB2_HALF_BIT_PRE_EMP;

		/* Override SlowSlewRate settings */
		cfg->SlowSlewRateForIa = 0;
		cfg->SlowSlewRateForGt = 0;
		cfg->SlowSlewRateForSa = 0;
		break;

	default:
		break;
	}
}