path: root/src/southbridge/intel/lynxpoint/lpc.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <pc80/mc146818rtc.h>
#include <pc80/isa-dma.h>
#include <pc80/i8259.h>
#include <arch/io.h>
#include <arch/ioapic.h>
#include <arch/acpi.h>
#include <cpu/cpu.h>
#include <elog.h>
#include "pch.h"

#define NMI_OFF	0

#define ENABLE_ACPI_MODE_IN_COREBOOT	0
#define TEST_SMM_FLASH_LOCKDOWN		0

typedef struct southbridge_intel_lynxpoint_config config_t;

static void pch_enable_apic(struct device *dev)
{
	int i;
	u32 reg32;
	volatile u32 *ioapic_index = (volatile u32 *)(IO_APIC_ADDR);
	volatile u32 *ioapic_data = (volatile u32 *)(IO_APIC_ADDR + 0x10);

	/* Enable ACPI I/O and power management.
	 * Set SCI IRQ to IRQ9
	 */
	pci_write_config8(dev, ACPI_CNTL, 0x80);

	*ioapic_index = 0;
	*ioapic_data = (1 << 25);

	/* affirm full set of redirection table entries ("write once") */
	*ioapic_index = 1;
	reg32 = *ioapic_data;
	*ioapic_index = 1;
	*ioapic_data = reg32;

	*ioapic_index = 0;
	reg32 = *ioapic_data;
	printk(BIOS_DEBUG, "Southbridge APIC ID = %x\n", (reg32 >> 24) & 0x0f);
	if (reg32 != (1 << 25))
		die("APIC Error\n");

	printk(BIOS_SPEW, "Dumping IOAPIC registers\n");
	for (i=0; i<3; i++) {
		*ioapic_index = i;
		printk(BIOS_SPEW, "  reg 0x%04x:", i);
		reg32 = *ioapic_data;
		printk(BIOS_SPEW, " 0x%08x\n", reg32);
	}

	*ioapic_index = 3; /* Select Boot Configuration register. */
	*ioapic_data = 1; /* Use Processor System Bus to deliver interrupts. */
}

static void pch_enable_serial_irqs(struct device *dev)
{
	/* Set packet length and toggle silent mode bit for one frame. */
	pci_write_config8(dev, SERIRQ_CNTL,
			  (1 << 7) | (1 << 6) | ((21 - 17) << 2) | (0 << 0));
#if !CONFIG_SERIRQ_CONTINUOUS_MODE
	pci_write_config8(dev, SERIRQ_CNTL,
			  (1 << 7) | (0 << 6) | ((21 - 17) << 2) | (0 << 0));
#endif
}

/* PIRQ[n]_ROUT[3:0] - PIRQ Routing Control
 * 0x00 - 0000 = Reserved
 * 0x01 - 0001 = Reserved
 * 0x02 - 0010 = Reserved
 * 0x03 - 0011 = IRQ3
 * 0x04 - 0100 = IRQ4
 * 0x05 - 0101 = IRQ5
 * 0x06 - 0110 = IRQ6
 * 0x07 - 0111 = IRQ7
 * 0x08 - 1000 = Reserved
 * 0x09 - 1001 = IRQ9
 * 0x0A - 1010 = IRQ10
 * 0x0B - 1011 = IRQ11
 * 0x0C - 1100 = IRQ12
 * 0x0D - 1101 = Reserved
 * 0x0E - 1110 = IRQ14
 * 0x0F - 1111 = IRQ15
 * PIRQ[n]_ROUT[7] - PIRQ Routing Control
 * 0x80 - The PIRQ is not routed.
 */

static void pch_pirq_init(device_t dev)
{
	device_t irq_dev;
	/* Get the chip configuration */
	config_t *config = dev->chip_info;

	pci_write_config8(dev, PIRQA_ROUT, config->pirqa_routing);
	pci_write_config8(dev, PIRQB_ROUT, config->pirqb_routing);
	pci_write_config8(dev, PIRQC_ROUT, config->pirqc_routing);
	pci_write_config8(dev, PIRQD_ROUT, config->pirqd_routing);

	pci_write_config8(dev, PIRQE_ROUT, config->pirqe_routing);
	pci_write_config8(dev, PIRQF_ROUT, config->pirqf_routing);
	pci_write_config8(dev, PIRQG_ROUT, config->pirqg_routing);
	pci_write_config8(dev, PIRQH_ROUT, config->pirqh_routing);

	/* Eric Biederman once said we should let the OS do this.
	 * I am not so sure anymore he was right.
	 */

	for(irq_dev = all_devices; irq_dev; irq_dev = irq_dev->next) {
		u8 int_pin=0, int_line=0;

		if (!irq_dev->enabled || irq_dev->path.type != DEVICE_PATH_PCI)
			continue;

		int_pin = pci_read_config8(irq_dev, PCI_INTERRUPT_PIN);

		switch (int_pin) {
		case 1: /* INTA# */ int_line = config->pirqa_routing; break;
		case 2: /* INTB# */ int_line = config->pirqb_routing; break;
		case 3: /* INTC# */ int_line = config->pirqc_routing; break;
		case 4: /* INTD# */ int_line = config->pirqd_routing; break;
		}

		if (!int_line)
			continue;

		pci_write_config8(irq_dev, PCI_INTERRUPT_LINE, int_line);
	}
}

static void pch_gpi_routing(device_t dev)
{
	/* Get the chip configuration */
	config_t *config = dev->chip_info;
	u32 reg32 = 0;

	/* An array would be much nicer here, or some
	 * other method of doing this.
	 */
	reg32 |= (config->gpi0_routing & 0x03) << 0;
	reg32 |= (config->gpi1_routing & 0x03) << 2;
	reg32 |= (config->gpi2_routing & 0x03) << 4;
	reg32 |= (config->gpi3_routing & 0x03) << 6;
	reg32 |= (config->gpi4_routing & 0x03) << 8;
	reg32 |= (config->gpi5_routing & 0x03) << 10;
	reg32 |= (config->gpi6_routing & 0x03) << 12;
	reg32 |= (config->gpi7_routing & 0x03) << 14;
	reg32 |= (config->gpi8_routing & 0x03) << 16;
	reg32 |= (config->gpi9_routing & 0x03) << 18;
	reg32 |= (config->gpi10_routing & 0x03) << 20;
	reg32 |= (config->gpi11_routing & 0x03) << 22;
	reg32 |= (config->gpi12_routing & 0x03) << 24;
	reg32 |= (config->gpi13_routing & 0x03) << 26;
	reg32 |= (config->gpi14_routing & 0x03) << 28;
	reg32 |= (config->gpi15_routing & 0x03) << 30;

	pci_write_config32(dev, 0xb8, reg32);
}

static void pch_power_options(device_t dev)
{
	u8 reg8;
	u16 reg16, pmbase;
	u32 reg32;
	const char *state;
	/* Get the chip configuration */
	config_t *config = dev->chip_info;

	int pwr_on=CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL;
	int nmi_option;

	/* Which state do we want to goto after g3 (power restored)?
	 * 0 == S0 Full On
	 * 1 == S5 Soft Off
	 *
	 * If the option is not existent (Laptops), use Kconfig setting.
	 */
	get_option(&pwr_on, "power_on_after_fail");

	reg16 = pci_read_config16(dev, GEN_PMCON_3);
	reg16 &= 0xfffe;
	switch (pwr_on) {
	case MAINBOARD_POWER_OFF:
		reg16 |= 1;
		state = "off";
		break;
	case MAINBOARD_POWER_ON:
		reg16 &= ~1;
		state = "on";
		break;
	case MAINBOARD_POWER_KEEP:
		reg16 &= ~1;
		state = "state keep";
		break;
	default:
		state = "undefined";
	}

	reg16 &= ~(3 << 4);	/* SLP_S4# Assertion Stretch 4s */
	reg16 |= (1 << 3);	/* SLP_S4# Assertion Stretch Enable */

	reg16 &= ~(1 << 10);
	reg16 |= (1 << 11);	/* SLP_S3# Min Assertion Width 50ms */

	reg16 |= (1 << 12);	/* Disable SLP stretch after SUS well */

	pci_write_config16(dev, GEN_PMCON_3, reg16);
	printk(BIOS_INFO, "Set power %s after power failure.\n", state);

	/* Set up NMI on errors. */
	reg8 = inb(0x61);
	reg8 &= 0x0f;		/* Higher Nibble must be 0 */
	reg8 &= ~(1 << 3);	/* IOCHK# NMI Enable */
	// reg8 &= ~(1 << 2);	/* PCI SERR# Enable */
	reg8 |= (1 << 2); /* PCI SERR# Disable for now */
	outb(reg8, 0x61);

	reg8 = inb(0x70);
	nmi_option = NMI_OFF;
	get_option(&nmi_option, "nmi");
	if (nmi_option) {
		printk(BIOS_INFO, "NMI sources enabled.\n");
		reg8 &= ~(1 << 7);	/* Set NMI. */
	} else {
		printk(BIOS_INFO, "NMI sources disabled.\n");
		reg8 |= ( 1 << 7);	/* Can't mask NMI from PCI-E and NMI_NOW */
	}
	outb(reg8, 0x70);

	/* Enable CPU_SLP# and Intel Speedstep, set SMI# rate down */
	reg16 = pci_read_config16(dev, GEN_PMCON_1);
	reg16 &= ~(3 << 0);	// SMI# rate 1 minute
	reg16 &= ~(1 << 10);	// Disable BIOS_PCI_EXP_EN for native PME
#if DEBUG_PERIODIC_SMIS
	/* Set DEBUG_PERIODIC_SMIS in pch.h to debug using
	 * periodic SMIs.
	 */
	reg16 |= (3 << 0); // Periodic SMI every 8s
#endif
	pci_write_config16(dev, GEN_PMCON_1, reg16);

	// Set the board's GPI routing.
	pch_gpi_routing(dev);

	pmbase = pci_read_config16(dev, 0x40) & 0xfffe;

	outl(config->gpe0_en, pmbase + GPE0_EN);
	outw(config->alt_gp_smi_en, pmbase + ALT_GP_SMI_EN);

	/* Set up power management block and determine sleep mode */
	reg32 = inl(pmbase + 0x04); // PM1_CNT
	reg32 &= ~(7 << 10);	// SLP_TYP
	reg32 |= (1 << 0);	// SCI_EN
	outl(reg32, pmbase + 0x04);

	/* Clear magic status bits to prevent unexpected wake */
	reg32 = RCBA32(0x3310);
	reg32 |= (1 << 4)|(1 << 5)|(1 << 0);
	RCBA32(0x3310) = reg32;

	reg32 = RCBA32(0x3f02);
	reg32 &= ~0xf;
	RCBA32(0x3f02) = reg32;
}

static void pch_rtc_init(struct device *dev)
{
	u8 reg8;
	int rtc_failed;

	reg8 = pci_read_config8(dev, GEN_PMCON_3);
	rtc_failed = reg8 & RTC_BATTERY_DEAD;
	if (rtc_failed) {
		reg8 &= ~RTC_BATTERY_DEAD;
		pci_write_config8(dev, GEN_PMCON_3, reg8);
#if CONFIG_ELOG
		elog_add_event(ELOG_TYPE_RTC_RESET);
#endif
	}
	printk(BIOS_DEBUG, "rtc_failed = 0x%x\n", rtc_failed);

	rtc_init(rtc_failed);
}

/* CougarPoint PCH Power Management init */
#if 0
static void cpt_pm_init(struct device *dev)
{
	printk(BIOS_DEBUG, "CougarPoint PM init\n");
	pci_write_config8(dev, 0xa9, 0x47);
	RCBA32_AND_OR(0x2238, ~0UL, (1 << 6)|(1 << 0));
	RCBA32_AND_OR(0x228c, ~0UL, (1 << 0));
	RCBA16_AND_OR(0x1100, ~0UL, (1 << 13)|(1 << 14));
	RCBA16_AND_OR(0x0900, ~0UL, (1 << 14));
	RCBA32(0x2304) = 0xc0388400;
	RCBA32_AND_OR(0x2314, ~0UL, (1 << 5)|(1 << 18));
	RCBA32_AND_OR(0x2320, ~0UL, (1 << 15)|(1 << 1));
	RCBA32_AND_OR(0x3314, ~0x1f, 0xf);
	RCBA32(0x3318) = 0x050f0000;
	RCBA32(0x3324) = 0x04000000;
	RCBA32_AND_OR(0x3340, ~0UL, 0xfffff);
	RCBA32_AND_OR(0x3344, ~0UL, (1 << 1));
	RCBA32(0x3360) = 0x0001c000;
	RCBA32(0x3368) = 0x00061100;
	RCBA32(0x3378) = 0x7f8fdfff;
	RCBA32(0x337c) = 0x000003fc;
	RCBA32(0x3388) = 0x00001000;
	RCBA32(0x3390) = 0x0001c000;
	RCBA32(0x33a0) = 0x00000800;
	RCBA32(0x33b0) = 0x00001000;
	RCBA32(0x33c0) = 0x00093900;
	RCBA32(0x33cc) = 0x24653002;
	RCBA32(0x33d0) = 0x062108fe;
	RCBA32_AND_OR(0x33d4, 0xf000f000, 0x00670060);
	RCBA32(0x3a28) = 0x01010000;
	RCBA32(0x3a2c) = 0x01010404;
	RCBA32(0x3a80) = 0x01041041;
	RCBA32_AND_OR(0x3a84, ~0x0000ffff, 0x00001001);
	RCBA32_AND_OR(0x3a84, ~0UL, (1 << 24)); /* SATA 2/3 disabled */
	RCBA32_AND_OR(0x3a88, ~0UL, (1 << 0));  /* SATA 4/5 disabled */
	RCBA32(0x3a6c) = 0x00000001;
	RCBA32_AND_OR(0x2344, 0x00ffff00, 0xff00000c);
	RCBA32_AND_OR(0x80c, ~(0xff << 20), 0x11 << 20);
	RCBA32(0x33c8) = 0;
	RCBA32_AND_OR(0x21b0, ~0UL, 0xf);
}
#endif

static void enable_hpet(void)
{
	u32 reg32;

	/* Move HPET to default address 0xfed00000 and enable it */
	reg32 = RCBA32(HPTC);
	reg32 |= (1 << 7); // HPET Address Enable
	reg32 &= ~(3 << 0);
	RCBA32(HPTC) = reg32;
	/* Read it back to stick. It's affected by posted write syndrome. */
	reg32 = RCBA32(HPTC);
}

static void enable_clock_gating(device_t dev)
{
#if CONFIG_INTEL_LYNXPOINT_LP
	/* LynxPoint LP */
	u32 reg32;
	u16 reg16;

	/* DMI */
	RCBA32_AND_OR(0x2234, ~0UL, 0xf);
	reg16 = pci_read_config16(dev, GEN_PMCON_1);
	reg16 &= ~((1 << 11) | (1 << 14));
	reg16 |= (1 << 5) | (1 << 6) | (1 << 7) | (1 << 12) | (1 << 13);
	reg16 |= (1 << 2); // PCI CLKRUN# Enable
	pci_write_config16(dev, GEN_PMCON_1, reg16);

	reg32 = pci_read_config32(dev, 0x64);
	reg32 |= (1 << 6);
	pci_write_config32(dev, 0x64, reg32);

	RCBA32_AND_OR(0x2614, 0x8fffffff, 0x0f006500);
	RCBA32_OR(0x900, 0x0000031f);

	reg32 = RCBA32(CG);
	reg32 |= (1 << 31); // LPC Dynamic
	reg32 |= (1 << 30); // LP LPC
	reg32 |= (1 << 28); // GPIO Dynamic
	reg32 |= (1 << 27); // HPET Dynamic
	reg32 |= (1 << 26); // LP LPC
	reg32 |= (1 << 22); // HDA Dynamic
	reg32 |= (1 << 16); // PCIe Dynamic
	RCBA32(CG) = reg32;

	RCBA32_OR(0x3434, 0x7); // LP LPC

	RCBA32_AND_OR(0x333c, 0xff0fffff, 0x00800000); // SATA

	RCBA32_OR(0x38c0, 0x3c07); // SPI Dynamic

	pch_iobp_update(0xCF000000, ~0UL, 0x00007001);
	pch_iobp_update(0xCE00C000, ~0UL, 0x00000001);
#else
	/* LynxPoint Mobile */
	u32 reg32;
	u16 reg16;

	/* DMI */
	RCBA32_AND_OR(0x2234, ~0UL, 0xf);
	reg16 = pci_read_config16(dev, GEN_PMCON_1);
	reg16 |= (1 << 11) | (1 << 12) | (1 << 14);
	reg16 |= (1 << 2); // PCI CLKRUN# Enable
	pci_write_config16(dev, GEN_PMCON_1, reg16);
	RCBA32_OR(0x900, (1 << 14));

	reg32 = RCBA32(CG);
	reg32 |= (1 << 22); // HDA Dynamic
	reg32 |= (1 << 31); // LPC Dynamic
	reg32 |= (1 << 16); // PCIe Dynamic
	reg32 |= (1 << 27); // HPET Dynamic
	reg32 |= (1 << 28); // GPIO Dynamic
	RCBA32(CG) = reg32;

	RCBA32_OR(0x38c0, 0x7); // SPI Dynamic
#endif
}

#if CONFIG_HAVE_SMI_HANDLER
static void pch_lock_smm(struct device *dev)
{
#if TEST_SMM_FLASH_LOCKDOWN
	u8 reg8;
#endif

	if (acpi_slp_type != 3) {
#if ENABLE_ACPI_MODE_IN_COREBOOT
		printk(BIOS_DEBUG, "Enabling ACPI via APMC:\n");
		outb(0xe1, 0xb2); // Enable ACPI mode
		printk(BIOS_DEBUG, "done.\n");
#else
		printk(BIOS_DEBUG, "Disabling ACPI via APMC:\n");
		outb(0x1e, 0xb2); // Disable ACPI mode
		printk(BIOS_DEBUG, "done.\n");
#endif
	}

	/* Don't allow evil boot loaders, kernels, or
	 * userspace applications to deceive us:
	 */
	smm_lock();

#if TEST_SMM_FLASH_LOCKDOWN
	/* Now try this: */
	printk(BIOS_DEBUG, "Locking BIOS to RO... ");
	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	printk(BIOS_DEBUG, " BLE: %s; BWE: %s\n", (reg8&2)?"on":"off",
			(reg8&1)?"rw":"ro");
	reg8 &= ~(1 << 0);			/* clear BIOSWE */
	pci_write_config8(dev, 0xdc, reg8);
	reg8 |= (1 << 1);			/* set BLE */
	pci_write_config8(dev, 0xdc, reg8);
	printk(BIOS_DEBUG, "ok.\n");
	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	printk(BIOS_DEBUG, " BLE: %s; BWE: %s\n", (reg8&2)?"on":"off",
			(reg8&1)?"rw":"ro");

	printk(BIOS_DEBUG, "Writing:\n");
	*(volatile u8 *)0xfff00000 = 0x00;
	printk(BIOS_DEBUG, "Testing:\n");
	reg8 |= (1 << 0);			/* set BIOSWE */
	pci_write_config8(dev, 0xdc, reg8);

	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	printk(BIOS_DEBUG, " BLE: %s; BWE: %s\n", (reg8&2)?"on":"off",
			(reg8&1)?"rw":"ro");
	printk(BIOS_DEBUG, "Done.\n");
#endif
}
#endif

static void pch_disable_smm_only_flashing(struct device *dev)
{
	u8 reg8;

	printk(BIOS_SPEW, "Enabling BIOS updates outside of SMM... ");
	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	reg8 &= ~(1 << 5);
	pci_write_config8(dev, 0xdc, reg8);
}

static void pch_fixups(struct device *dev)
{
	u8 gen_pmcon_2;

	/* Indicate DRAM init done for MRC S3 to know it can resume */
	gen_pmcon_2 = pci_read_config8(dev, GEN_PMCON_2);
	gen_pmcon_2 |= (1 << 7);
	pci_write_config8(dev, GEN_PMCON_2, gen_pmcon_2);

	/*
	 * Enable DMI ASPM in the PCH
	 */
	RCBA32_AND_OR(0x2304, ~(1 << 10), 0);
	RCBA32_OR(0x21a4, (1 << 11)|(1 << 10));
	RCBA32_OR(0x21a8, 0x3);
}

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

	printk(BIOS_DEBUG, "pch_decode_init\n");

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

static void lpc_init(struct device *dev)
{
	printk(BIOS_DEBUG, "pch: lpc_init\n");

	/* Set the value for PCI command register. */
	pci_write_config16(dev, PCI_COMMAND, 0x000f);

	/* IO APIC initialization. */
	pch_enable_apic(dev);

	pch_enable_serial_irqs(dev);

	/* Setup the PIRQ. */
	pch_pirq_init(dev);

	/* Setup power options. */
	pch_power_options(dev);

	/* Initialize power management */
	switch (pch_silicon_type()) {
	default:
		printk(BIOS_ERR, "Unknown Chipset: 0x%04x\n", dev->device);
	}

	/* Set the state of the GPIO lines. */
	//gpio_init(dev);

	/* Initialize the real time clock. */
	pch_rtc_init(dev);

	/* Initialize ISA DMA. */
	isa_dma_init();

	/* Initialize the High Precision Event Timers, if present. */
	enable_hpet();

	/* Initialize Clock Gating */
	enable_clock_gating(dev);

	setup_i8259();

	/* The OS should do this? */
	/* Interrupt 9 should be level triggered (SCI) */
	i8259_configure_irq_trigger(9, 1);

	pch_disable_smm_only_flashing(dev);

#if CONFIG_HAVE_SMI_HANDLER
	pch_lock_smm(dev);
#endif

	pch_fixups(dev);
}

static void pch_lpc_read_resources(device_t dev)
{
	struct resource *res;
	config_t *config = dev->chip_info;
	u8 io_index = 0;

	/* Get the normal PCI resources of this device. */
	pci_dev_read_resources(dev);

	/* Add an extra subtractive resource for both memory and I/O. */
	res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
	res->base = 0;
	res->size = 0x1000;
	res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;

	/* GPIOBASE */
	res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
	res->base = DEFAULT_GPIOBASE;
	res->size = DEFAULT_GPIOSIZE;
	res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;

	res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
	res->base = 0xff800000;
	res->size = 0x00800000; /* 8 MB for flash */
	res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;

	res = new_resource(dev, io_index++); /* IOAPIC */
	res->base = IO_APIC_ADDR;
	res->size = 0x00001000;
	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;

	/* Set PCH IO decode ranges if required.*/
	if ((config->gen1_dec & 0xFFFC) > 0x1000) {
		res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
		res->base = config->gen1_dec & 0xFFFC;
		res->size = (config->gen1_dec >> 16) & 0xFC;
		res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
				 IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
	}

	if ((config->gen2_dec & 0xFFFC) > 0x1000) {
		res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
		res->base = config->gen2_dec & 0xFFFC;
		res->size = (config->gen2_dec >> 16) & 0xFC;
		res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
				 IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
	}

	if ((config->gen3_dec & 0xFFFC) > 0x1000) {
		res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
		res->base = config->gen3_dec & 0xFFFC;
		res->size = (config->gen3_dec >> 16) & 0xFC;
		res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
				 IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
	}

	if ((config->gen4_dec & 0xFFFC) > 0x1000) {
		res = new_resource(dev, IOINDEX_SUBTRACTIVE(io_index++, 0));
		res->base = config->gen4_dec & 0xFFFC;
		res->size = (config->gen4_dec >> 16) & 0xFC;
		res->flags = IORESOURCE_IO| IORESOURCE_SUBTRACTIVE |
				 IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
	}
}

static void pch_lpc_enable_resources(device_t dev)
{
	pch_decode_init(dev);
	return pci_dev_enable_resources(dev);
}

static void pch_lpc_enable(device_t dev)
{
	/* Enable PCH Display Port */
	RCBA16(DISPBDF) = 0x0010;
	RCBA32_OR(FD2, PCH_ENABLE_DBDF);

	pch_enable(dev);
}

static void set_subsystem(device_t dev, unsigned vendor, unsigned device)
{
	if (!vendor || !device) {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				pci_read_config32(dev, PCI_VENDOR_ID));
	} else {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				((device & 0xffff) << 16) | (vendor & 0xffff));
	}
}

static struct pci_operations pci_ops = {
	.set_subsystem = set_subsystem,
};

static struct device_operations device_ops = {
	.read_resources		= pch_lpc_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pch_lpc_enable_resources,
	.init			= lpc_init,
	.enable			= pch_lpc_enable,
	.scan_bus		= scan_static_bus,
	.ops_pci		= &pci_ops,
};


/* IDs for LPC device of Intel 8 Series Chipset (Lynx Point) */
static const unsigned short pci_device_ids[] = {
	0x8c41, /* Mobile Full Featured Engineering Sample. */
	0x8c42, /* Desktop Full Featured Engineering Sample. */
	0x8c44, /* Z87 SKU */
	0x8c46, /* Z85 SKU */
	0x8c49, /* HM86 SKU */
	0x8c4a, /* H87 SKU */
	0x8c4b, /* HM87 SKU */
	0x8c4c, /* Q85 SKU */
	0x8c4e, /* Q87 SKU */
	0x8c4f, /* QM87 SKU */
	0x9c41, /* LP Full Featured Engineering Sample */
	0x9c43, /* LP Premium SKU */
	0x9c45, /* LP Mainstream SKU */
	0x9c47, /* LP Value SKU */
	0 };

static const struct pci_driver pch_lpc __pci_driver = {
	.ops	 = &device_ops,
	.vendor	 = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};