src/southbridge/intel/lynxpoint/early_pch.c

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

#include <console/console.h>
#include <device/pci_ops.h>
#include <device/device.h>
#include <device/pci_def.h>
#include <device/smbus_host.h>
#include <southbridge/intel/common/pmbase.h>

#include "pch.h"
#include "chip.h"

#if CONFIG(INTEL_LYNXPOINT_LP)
#include "lp_gpio.h"
#else
#include <southbridge/intel/common/gpio.h>
#endif

enum pch_platform_type get_pch_platform_type(void)
{
	const u16 did = pci_read_config16(PCH_LPC_DEV, PCI_DEVICE_ID);

	/* Check if this is a LPT-LP or WPT-LP device ID */
	if ((did & 0xff00) == 0x9c00)
		return PCH_TYPE_ULT;

	/* Non-LP laptop SKUs have an odd device ID (least significant bit is one) */
	if (did & 1)
		return PCH_TYPE_MOBILE;

	/* Desktop and Server SKUs have an even device ID */
	return PCH_TYPE_DESKTOP;
}

static void pch_enable_bars(void)
{
	pci_write_config32(PCH_LPC_DEV, RCBA, CONFIG_FIXED_RCBA_MMIO_BASE | 1);

	pci_write_config32(PCH_LPC_DEV, PMBASE, DEFAULT_PMBASE | 1);
	/* Enable ACPI BAR */
	pci_write_config8(PCH_LPC_DEV, ACPI_CNTL, ACPI_EN);

	pci_write_config32(PCH_LPC_DEV, GPIO_BASE, DEFAULT_GPIOBASE | 1);

	/* Enable GPIO functionality. */
	pci_write_config8(PCH_LPC_DEV, GPIO_CNTL, 0x10);
}

static void pch_generic_setup(void)
{
	printk(BIOS_DEBUG, "Disabling Watchdog reboot...");
	RCBA32(GCS) = RCBA32(GCS) | (1 << 5);	/* No reset */
	write_pmbase16(0x60 | 0x08, (1 << 11));	/* halt timer */
	printk(BIOS_DEBUG, " done.\n");
}

void pch_enable_lpc(void)
{
	const struct device *dev = pcidev_on_root(0x1f, 0);
	const struct southbridge_intel_lynxpoint_config *config = NULL;

	/* Set COM1/COM2 decode range */
	pci_write_config16(PCH_LPC_DEV, LPC_IO_DEC, 0x0010);

	/* Enable SuperIO + MC + COM1 + PS/2 Keyboard/Mouse */
	u16 lpc_config = CNF1_LPC_EN | CNF2_LPC_EN | GAMEL_LPC_EN |
		COMA_LPC_EN | KBC_LPC_EN | MC_LPC_EN;
	pci_write_config16(PCH_LPC_DEV, LPC_EN, lpc_config);

	/* Set up generic decode ranges */
	if (!dev)
		return;
	if (dev->chip_info)
		config = dev->chip_info;
	if (!config)
		return;

	pci_write_config32(PCH_LPC_DEV, LPC_GEN1_DEC, config->gen1_dec);
	pci_write_config32(PCH_LPC_DEV, LPC_GEN2_DEC, config->gen2_dec);
	pci_write_config32(PCH_LPC_DEV, LPC_GEN3_DEC, config->gen3_dec);
	pci_write_config32(PCH_LPC_DEV, LPC_GEN4_DEC, config->gen4_dec);
}

void __weak mainboard_config_superio(void)
{
}

void early_pch_init(void)
{
	pch_enable_bars();

#if CONFIG(INTEL_LYNXPOINT_LP)
	setup_pch_lp_gpios(mainboard_lp_gpio_map);
#else
	setup_pch_gpios(&mainboard_gpio_map);
#endif
	pch_generic_setup();

	/* Enable SMBus for reading SPDs. */
	enable_smbus();

	/* Enable IOAPIC */
	RCBA16(OIC) = 0x0100;

	/* PCH BWG says to read back the IOAPIC enable register */
	(void)RCBA16(OIC);

	/* Mainboard RCBA settings */
	mainboard_config_rcba();

	RCBA32_OR(FD, PCH_DISABLE_ALWAYS);

	RCBA32(0x2088) = 0x00109000;

	RCBA32_OR(0x20ac, 1 << 30);

	if (!pch_is_lp()) {
		RCBA32_AND_OR(0x2340, ~(0xff <<  0), 0x1b <<  0);
		RCBA32_AND_OR(0x2340, ~(0xff << 16), 0x3a << 16);

		RCBA32(0x2324) = 0x00854c74;
	}
}