src/soc/intel/skylake/lpc.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 * Copyright (C) 2014 Google Inc.
 * Copyright (C) 2015-2018 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "chip.h"
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <pc80/isa-dma.h>
#include <pc80/i8259.h>
#include <arch/ioapic.h>
#include <intelblocks/itss.h>
#include <intelblocks/lpc_lib.h>
#include <intelblocks/pcr.h>
#include <reg_script.h>
#include <soc/iomap.h>
#include <soc/pcr_ids.h>
#include <soc/intel/common/block/lpc/lpc_def.h>

/**
  PCH preserved MMIO range, 24 MB, from 0xFD000000 to 0xFE7FFFFF
**/

static const struct lpc_mmio_range skl_lpc_fixed_mmio_ranges[] = {
	{ PCH_PRESERVED_BASE_ADDRESS, PCH_PRESERVED_BASE_SIZE },
	{ 0, 0 }
};

const struct lpc_mmio_range *soc_get_fixed_mmio_ranges(void)
{
	return skl_lpc_fixed_mmio_ranges;
}

static void pch_enable_ioapic(struct device *dev)
{
	u32 reg32;
	/* PCH-LP has 120 redirection entries */
	const int redir_entries = 120;

	set_ioapic_id((void *)IO_APIC_ADDR, 0x02);

	/* affirm full set of redirection table entries ("write once") */
	reg32 = io_apic_read((void *)IO_APIC_ADDR, 0x01);

	reg32 &= ~0x00ff0000;
	reg32 |= (redir_entries - 1) << 16;

	io_apic_write((void *)IO_APIC_ADDR, 0x01, reg32);

	/*
	 * Select Boot Configuration register (0x03) and
	 * use Processor System Bus (0x01) to deliver interrupts.
	 */
	io_apic_write((void *)IO_APIC_ADDR, 0x03, 0x01);
}

void soc_get_gen_io_dec_range(const struct device *dev, uint32_t *gen_io_dec)
{
	const config_t *config = dev->chip_info;

	gen_io_dec[0] = config->gen1_dec;
	gen_io_dec[1] = config->gen2_dec;
	gen_io_dec[2] = config->gen3_dec;
	gen_io_dec[3] = config->gen4_dec;
}

void soc_setup_dmi_pcr_io_dec(uint32_t *gen_io_dec)
{
	/* Mirror these same settings in DMI PCR */
	pcr_write32(PID_DMI, PCR_DMI_LPCLGIR1, gen_io_dec[0]);
	pcr_write32(PID_DMI, PCR_DMI_LPCLGIR2, gen_io_dec[1]);
	pcr_write32(PID_DMI, PCR_DMI_LPCLGIR3, gen_io_dec[2]);
	pcr_write32(PID_DMI, PCR_DMI_LPCLGIR4, gen_io_dec[3]);
}

static const struct reg_script pch_misc_init_script[] = {
	/* Setup NMI on errors, disable SERR */
	REG_IO_RMW8(0x61, ~0xf0, (1 << 2)),
	/* Disable NMI sources */
	REG_IO_OR8(0x70, (1 << 7)),
	/* Enable BIOS updates outside of SMM */
	REG_PCI_RMW8(0xdc, ~(1 << 5), 0),
	REG_SCRIPT_END
};

static void clock_gate_8254(struct device *dev)
{
	const config_t *config = dev->chip_info;

	if (!config->clock_gate_8254)
		return;

	itss_clock_gate_8254();
}

void lpc_soc_init(struct device *dev)
{
	const config_t *const config = dev->chip_info;

	/* Legacy initialization */
	isa_dma_init();
	reg_script_run_on_dev(PCH_DEV_LPC, pch_misc_init_script);

	/* Enable CLKRUN_EN for power gating LPC */
	lpc_enable_pci_clk_cntl();

	/* Set LPC Serial IRQ mode */
	lpc_set_serirq_mode(config->serirq_mode);

	/* Interrupt configuration */
	pch_enable_ioapic(dev);
	soc_pch_pirq_init(dev);
	setup_i8259();
	i8259_configure_irq_trigger(9, 1);
	clock_gate_8254(dev);
}