path: root/src/southbridge/intel/i82801xx/i82801xx_lpc.c

/*
 * This file is part of the LinuxBIOS project.
 *
 * Copyright (C) 2003 Linux Networx
 * Copyright (C) 2003 SuSE Linux AG
 * Copyright (C) 2005 Tyan Computer
 * (Written by Yinghai Lu <yinghailu@gmail.com> for Tyan Computer)
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 */

/* From 82801DBM, needs to be fixed to support everything the 82801ER does. */

#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 <arch/io.h>
#include "i82801xx.h"

#define NMI_OFF 0

void i82801xx_enable_ioapic(struct device *dev)
{
	uint32_t reg32;
	volatile uint32_t *ioapic_index = (volatile uint32_t *)0xfec00000;
	volatile uint32_t *ioapic_data = (volatile uint32_t *)0xfec00010;

	reg32 = pci_read_config32(dev, GEN_CNTL);
	reg32 |= (3 << 7);	/* Enable IOAPIC */
	reg32 |= (1 << 13);	/* Coprocessor error enable */
	reg32 |= (1 << 1);	/* Delayed transaction enable */
	reg32 |= (1 << 2);	/* DMA collection buffer enable */
	pci_write_config32(dev, GEN_CNTL, reg32);
	printk_debug("IOAPIC Southbridge enabled %x\n", reg32);

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

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

	/* TODO: From i82801ca, needed/useful on other ICH? */
	*ioapic_index = 3;	// Select Boot Configuration register
	*ioapic_data = 1;	// Use Processor System Bus to deliver interrupts
}

void i82801xx_enable_serial_irqs(struct device *dev)
{
	/* Set packet length and toggle silent mode bit. */
	pci_write_config8(dev, SERIRQ_CNTL,
			  (1 << 7) | (1 << 6) | ((21 - 17) << 2) | (0 << 0));
	pci_write_config8(dev, SERIRQ_CNTL,
			  (1 << 7) | (0 << 6) | ((21 - 17) << 2) | (0 << 0));
	/* TODO: Explain/#define the real meaning of these magic numbers. */
}

void i82801xx_lpc_route_dma(struct device *dev, uint8_t mask)
{
	uint16_t reg16;
	int i;

	reg16 = pci_read_config16(dev, PCI_DMA_CFG);
	reg16 &= 0x300;
	for (i = 0; i < 8; i++) {
		if (i == 4)
			continue;
		reg16 |= ((mask & (1 << i)) ? 3 : 1) << (i * 2);
	}
	pci_write_config16(dev, PCI_DMA_CFG, reg16);
}

/* TODO: Needs serious cleanup/comments. */
void i82801xx_rtc_init(struct device *dev)
{
	uint8_t reg8;
	uint32_t reg32;
	int rtc_failed;

	reg8 = pci_read_config8(dev, GEN_PMCON_3);
	rtc_failed = reg8 & RTC_BATTERY_DEAD;
	if (rtc_failed) {
		reg8 &= ~(1 << 1);	/* preserve the power fail state */
		pci_write_config8(dev, GEN_PMCON_3, reg8);
	}
	reg32 = pci_read_config32(dev, GEN_STS);
	rtc_failed |= reg32 & (1 << 2);
	rtc_init(rtc_failed);
}

void i82801xx_1f0_misc(struct device *dev)
{
	/* TODO: break this down into smaller functions */

	//move to acpi_enable or something
	/* Set ACPI base address to 0x1100 (I/O space) */
	pci_write_config32(dev, PMBASE, PM_BASE_ADDR | 1);
	/* Enable ACPI I/O and power management */
	pci_write_config8(dev, ACPI_CNTL, 0x10);
	/* Set GPIO base address to 0x1180 (I/O space) */
	pci_write_config32(dev, GPIO_BASE, GPIO_BASE_ADDR | 1);
	/* Enable GPIO */
	pci_write_config8(dev, GPIO_CNTL, 0x10);

	//get rid of?
	/* Route PIRQA to IRQ11, PIRQB to IRQ3, PIRQC to IRQ5, PIRQD to IRQ10 */
	pci_write_config32(dev, PIRQA_ROUT, 0x0A05030B);
	/* Route PIRQE to IRQ7. Leave PIRQF - PIRQH unrouted */
	pci_write_config8(dev, PIRQE_ROUT, 0x07);

	//move to i82801xx_init
	/* Prevent LPC disabling, enable parity errors, and SERR# (System Error) */
	pci_write_config16(dev, PCI_COMMAND, 0x014f);
	/* Enable access to the upper 128 byte bank of CMOS RAM */
	pci_write_config8(dev, RTC_CONF, 0x04);
	/* Decode 0x3F8-0x3FF (COM1) for COMA port, 0x2F8-0x2FF (COM2) for COMB */
	pci_write_config8(dev, COM_DEC, 0x10);
	/* LPT decode defaults to 0x378-0x37F and 0x778-0x77F
	 * Floppy decode defaults to 0x3F0-0x3F5, 0x3F7 */
	/* Enable: COMA, COMB, LPT, Floppy
	 * Disable: Microcontroller, Sound, Gameport */
	pci_write_config16(dev, LPC_EN, 0x000F);
}

static void enable_hpet(struct device *dev)
{
#ifdef HPET_PRESENT
	uint32_t reg32;
	uint32_t code = (0 & 0x3);

	reg32 = pci_read_config32(dev, GEN_CNTL);
	reg32 |= (1 << 17);	/* Enable HPET */
	/*
	 * Bits [16:15]	Memory Address Range
	 * 00		FED0_0000h - FED0_03FFh
	 * 01		FED0_1000h - FED0_13FFh
	 * 10		FED0_2000h - FED0_23FFh
	 * 11		FED0_3000h - FED0_33FFh
	 */
	reg32 &= ~(3 << 15);	/* Clear it */
	reg32 |= (code << 15);
	/* reg32 is never written to anywhere? */
	printk_debug("Enabling HPET @0x%x\n", HPET_ADDR | (code << 12));
#endif
}

static void lpc_init(struct device *dev)
{
	uint8_t byte;
	int pwr_on = -1;
	int nmi_option;

	/* IO APIC initialization */
	i82801xx_enable_ioapic(dev);

	i82801xx_enable_serial_irqs(dev);

	/* TODO: Find out if this is being used/works */
#ifdef SUSPICIOUS_LOOKING_CODE
	/* The ICH-4 datasheet does not mention this configuration register.
	 * This code may have been inherited (incorrectly) from code for
	 * the AMD 766 southbridge, which *does* support this functionality.
	 */

	/* Posted memory write enable */
	byte = pci_read_config8(dev, 0x46);
	pci_write_config8(dev, 0x46, byte | (1 << 0));
#endif

	/* power after power fail */
	/* FIXME this doesn't work! */
	/* Which state do we want to goto after g3 (power restored)?
	 * 0 == S0 Full On
	 * 1 == S5 Soft Off
	 */
	pci_write_config8(dev, GEN_PMCON_3, pwr_on ? 0 : 1);
	printk_info("Set power %s if power fails\n", pwr_on ? "on" : "off");

	/* Set up NMI on errors */
	byte = inb(0x61);
	byte &= ~(1 << 3);	/* IOCHK# NMI Enable */
	byte &= ~(1 << 2);	/* PCI SERR# Enable */
	outb(byte, 0x61);
	byte = inb(0x70);

	nmi_option = NMI_OFF;
	get_option(&nmi_option, "nmi");
	if (nmi_option) {
		byte &= ~(1 << 7);	/* Set NMI */
		outb(byte, 0x70);
	}

	/* Initialize the real time clock */
	i82801xx_rtc_init(dev);

	i82801xx_lpc_route_dma(dev, 0xff);

	/* Initialize isa dma */
	isa_dma_init();

	i82801xx_1f0_misc(dev);
	/* Initialize the High Precision Event Timers, if present */
	enable_hpet(dev);
}

static void i82801xx_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->flags =
	    IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;

	res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
	res->flags =
	    IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
}

static void i82801xx_lpc_enable_resources(device_t dev)
{
	pci_dev_enable_resources(dev);
	enable_childrens_resources(dev);
}

static struct device_operations lpc_ops = {
	.read_resources		= i82801xx_lpc_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= i82801xx_lpc_enable_resources,
	.init			= lpc_init,
	.scan_bus		= scan_static_bus,
	.enable			= i82801xx_enable,
};

static struct pci_driver i82801aa_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x2410,
};

static struct pci_driver i82801ab_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x2420,
};

static struct pci_driver i82801ba_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x2440,
};

static struct pci_driver i82801ca_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x2480,
};

static struct pci_driver i82801db_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x24c0,
};

static struct pci_driver i82801dbm_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x24cc,
};

/* 82801EB and 82801ER */
static struct pci_driver i82801ex_lpc __pci_driver = {
	.ops	= &lpc_ops,
	.vendor	= PCI_VENDOR_ID_INTEL,
	.device	= 0x24d0,
};