path: root/drivers/pnp/pnpacpi/rsparser.c

/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 *
 * 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, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include "pnpacpi.h"

#ifdef CONFIG_IA64
#define valid_IRQ(i) (1)
#else
#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
#endif

/*
 * Allocated Resources
 */
static int irq_flags(int triggering, int polarity, int shareable)
{
	int flags;

	if (triggering == ACPI_LEVEL_SENSITIVE) {
		if (polarity == ACPI_ACTIVE_LOW)
			flags = IORESOURCE_IRQ_LOWLEVEL;
		else
			flags = IORESOURCE_IRQ_HIGHLEVEL;
	} else {
		if (polarity == ACPI_ACTIVE_LOW)
			flags = IORESOURCE_IRQ_LOWEDGE;
		else
			flags = IORESOURCE_IRQ_HIGHEDGE;
	}

	if (shareable)
		flags |= IORESOURCE_IRQ_SHAREABLE;

	return flags;
}

static void decode_irq_flags(int flag, int *triggering, int *polarity)
{
	switch (flag) {
	case IORESOURCE_IRQ_LOWLEVEL:
		*triggering = ACPI_LEVEL_SENSITIVE;
		*polarity = ACPI_ACTIVE_LOW;
		break;
	case IORESOURCE_IRQ_HIGHLEVEL:
		*triggering = ACPI_LEVEL_SENSITIVE;
		*polarity = ACPI_ACTIVE_HIGH;
		break;
	case IORESOURCE_IRQ_LOWEDGE:
		*triggering = ACPI_EDGE_SENSITIVE;
		*polarity = ACPI_ACTIVE_LOW;
		break;
	case IORESOURCE_IRQ_HIGHEDGE:
		*triggering = ACPI_EDGE_SENSITIVE;
		*polarity = ACPI_ACTIVE_HIGH;
		break;
	}
}

static void pnpacpi_parse_allocated_irqresource(struct pnp_dev *dev,
						u32 gsi, int triggering,
						int polarity, int shareable)
{
	struct pnp_resource_table *res = &dev->res;
	int i = 0;
	int irq;
	int p, t;
	static unsigned char warned;

	if (!valid_IRQ(gsi))
		return;

	while (!(res->irq_resource[i].flags & IORESOURCE_UNSET) &&
	       i < PNP_MAX_IRQ)
		i++;
	if (i >= PNP_MAX_IRQ) {
		if (!warned) {
			printk(KERN_WARNING "pnpacpi: exceeded the max number"
				" of IRQ resources: %d\n", PNP_MAX_IRQ);
			warned = 1;
		}
		return;
	}
	/*
	 * in IO-APIC mode, use overrided attribute. Two reasons:
	 * 1. BIOS bug in DSDT
	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
	 */
	if (!acpi_get_override_irq(gsi, &t, &p)) {
		t = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
		p = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;

		if (triggering != t || polarity != p) {
			dev_warn(&dev->dev, "IRQ %d override to %s, %s\n",
				gsi, t ? "edge":"level", p ? "low":"high");
			triggering = t;
			polarity = p;
		}
	}

	res->irq_resource[i].flags = IORESOURCE_IRQ;	// Also clears _UNSET flag
	res->irq_resource[i].flags |= irq_flags(triggering, polarity, shareable);
	irq = acpi_register_gsi(gsi, triggering, polarity);
	if (irq < 0) {
		res->irq_resource[i].flags |= IORESOURCE_DISABLED;
		return;
	}

	res->irq_resource[i].start = irq;
	res->irq_resource[i].end = irq;
	pcibios_penalize_isa_irq(irq, 1