/*
 * 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 "i82801gx.h"

#define NMI_OFF	0

#define ENABLE_ACPI_MODE_IN_COREBOOT	0
#define TEST_SMM_FLASH_LOCKDOWN		0

typedef struct southbridge_intel_i82801gx_config config_t;

static void i82801gx_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);

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

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

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

static void i82801gx_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));
}

/* 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 i82801gx_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 i82801gx_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);
}

extern u8 acpi_slp_type;

static void i82801gx_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 MAINBOARD_POWER_ON.
	 */
	if (get_option(&pwr_on, "power_on_after_fail") < 0)
		pwr_on = MAINBOARD_POWER_ON;

	reg8 = pci_read_config8(dev, GEN_PMCON_3);
	reg8 &= 0xfe;
	switch (pwr_on) {
	case MAINBOARD_POWER_OFF:
		reg8 |= 1;
		state = "off";
		break;
	case MAINBOARD_POWER_ON:
		reg8 &= ~1;
		state = "on";
		break;
	case MAINBOARD_POWER_KEEP:
		reg8 &= ~1;
		state = "state keep";
		break;
	default:
		state = "undefined";
	}

	reg8 |= (3 << 4);	/* avoid #S4 assertions */
	reg8 &= ~(1 << 3);	/* minimum asssertion is 1 to 2 RTCCLK */

	pci_write_config8(dev, GEN_PMCON_3, reg8);
	printk_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_info ("NMI sources enabled.\n");
		reg8 &= ~(1 << 7);	/* Set NMI. */
	} else {
		printk_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 << 2);	// CLKRUN_EN - Mobile/Ultra only
	reg16 |= (1 << 3);	// Speedstep Enable - Mobile/Ultra only
	reg16 |= (1 << 5);	// CPUSLP_EN Desktop only
	// another laptop wants this?
	// reg16 &= ~(1 << 10);	// BIOS_PCI_EXP_EN - Desktop/Mobile only
	reg16 |= (1 << 10);	// BIOS_PCI_EXP_EN - Desktop/Mobile only
#if DEBUG_PERIODIC_SMIS
	/* Set DEBUG_PERIODIC_SMIS in i82801gx.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.
	i82801gx_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 << 1);	// enable C3->C0 transition on bus master
	reg32 |= (1 << 0);	// SCI_EN
	outl(reg32, pmbase + 0x04);
}

static void i82801gx_configure_cstates(device_t dev)
{
	u8 reg8;

	reg8 = pci_read_config8(dev, 0xa9); // Cx state configuration
	reg8 |= (1 << 4) | (1 << 3) | (1 << 2);	// Enable Popup & Popdown
	pci_write_config8(dev, 0xa9, reg8);

	// Set Deeper Sleep configuration to recommended values
	reg8 = pci_read_config8(dev, 0xaa);
	reg8 &= 0xf0;
	reg8 |= (2 << 2);	// Deeper Sleep to Stop CPU: 34-40us
	reg8 |= (2 << 0);	// Deeper Sleep to Sleep: 15us
	pci_write_config8(dev, 0xaa, reg8);
}

static void i82801gx_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);
	}
	printk_debug("rtc_failed = 0x%x\n", rtc_failed);

	rtc_init(rtc_failed);
}

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;
}

static void enable_clock_gating(void)
{
	u32 reg32;

	/* Enable Clock Gating for most devices */
	reg32 = RCBA32(CG);
	reg32 |= (1 << 31);	// LPC clock gating
	reg32 |= (1 << 30);	// PATA clock gating
	// SATA clock gating
	reg32 |= (1 << 27) | (1 << 26) | (1 << 25) | (1 << 24);
	reg32 |= (1 << 23);	// AC97 clock gating
	reg32 |= (1 << 19);	// USB EHCI clock gating
	reg32 |= (1 << 3) | (1 << 1);	// DMI clock gating
	reg32 |= (1 << 2);	// PCIe clock gating;
	reg32 &= ~(1 << 20); // No static clock gating for USB
	reg32 &= ~( (1 << 29) | (1 << 28) ); // Disable UHCI clock gating
	RCBA32(CG) = reg32;
}

#if CONFIG_HAVE_SMI_HANDLER
static void i82801gx_lock_smm(struct device *dev)
{
	void smm_lock(void);
#if TEST_SMM_FLASH_LOCKDOWN
	u8 reg8;
#endif

#if ENABLE_ACPI_MODE_IN_COREBOOT
	printk_debug("Enabling ACPI via APMC:\n");
	outb(0xe1, 0xb2); // Enable ACPI mode
	printk_debug("done.\n");
#else
	printk_debug("Disabling ACPI via APMC:\n");
	outb(0x1e, 0xb2); // Disable ACPI mode
	printk_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_debug("Locking BIOS to RO... ");
	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	printk_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_debug("ok.\n");
	reg8 = pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
	printk_debug(" BLE: %s; BWE: %s\n", (reg8&2)?"on":"off",
			(reg8&1)?"rw":"ro");

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

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

#define SPIBASE 0x3020
static void i82801gx_spi_init(void)
{
	u16 spicontrol;

	spicontrol = RCBA16(SPIBASE + 2);
	spicontrol &= ~(1 << 0); // SPI Access Request
	RCBA16(SPIBASE + 2) = spicontrol;
}

static void i82801gx_fixups(struct device *dev)
{
	/* This needs to happen after PCI enumeration */
	RCBA32(0x1d40) |= 1;

	/* USB Transient Disconnect Detect:
	 * Prevent a SE0 condition on the USB ports from being
	 * interpreted by the UHCI controller as a disconnect
	 */
	pci_write_config8(dev, 0xad, 0x3);
}

static void lpc_init(struct device *dev)
{
	printk_debug("i82801gx: lpc_init\n");

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

	/* IO APIC initialization. */
	i82801gx_enable_apic(dev);

	i82801gx_enable_serial_irqs(dev);

	/* Setup the PIRQ. */
	i82801gx_pirq_init(dev);

	/* Setup power options. */
	i82801gx_power_options(dev);

	/* Configure Cx state registers */
	i82801gx_configure_cstates(dev);

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

	/* Initialize the real time clock. */
	i82801gx_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();

	setup_i8259();

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

#if CONFIG_HAVE_SMI_HANDLER
	i82801gx_lock_smm(dev);
#endif

	i82801gx_spi_init();

	i82801gx_fixups(dev);
}

static void i82801gx_lpc_read_resources(device_t dev)
{
	struct resource *res;

	/* 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(0, 0));
	res->base = 0;
	res->size = 0x1000;
	res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;

	res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 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, 3); /* IOAPIC */
	res->base = 0xfec00000;
	res->size = 0x00001000;
	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
}

static void i82801gx_lpc_enable_resources(device_t dev)
{
	pci_dev_enable_resources(dev);
	enable_childrens_resources(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		= i82801gx_lpc_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= i82801gx_lpc_enable_resources,
	.init			= lpc_init,
	.scan_bus		= scan_static_bus,
	.enable			= i82801gx_enable,
	.ops_pci		= &pci_ops,
};

/* 82801GH (ICH7 DH) */
static const struct pci_driver ich7_dh_lpc __pci_driver = {
	.ops	= &device_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x27b0,
};

/* 82801GB/GR (ICH7/ICH7R) */
static const struct pci_driver ich7_ich7r_lpc __pci_driver = {
	.ops	= &device_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x27b8,
};

/* 82801GBM/GU (ICH7-M/ICH7-U) */
static const struct pci_driver ich7m_ich7u_lpc __pci_driver = {
	.ops	= &device_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x27b9,
};

/* 82801GHM (ICH7-M DH) */
static const struct pci_driver ich7m_dh_lpc __pci_driver = {
	.ops	= &device_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x27bd,
};