[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / pci_irq.c

/*
 *  pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */


#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_irq");

static struct acpi_prt_list acpi_prt;
static DEFINE_SPINLOCK(acpi_prt_lock);

/* --------------------------------------------------------------------------
                         PCI IRQ Routing Table (PRT) Support
   -------------------------------------------------------------------------- */

static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
							  int bus,
							  int device, int pin)
{
	struct acpi_prt_entry *entry = NULL;

	if (!acpi_prt.count)
		return NULL;

	/*
	 * Parse through all PRT entries looking for a match on the specified
	 * PCI device's segment, bus, device, and pin (don't care about func).
	 *
	 */
	spin_lock(&acpi_prt_lock);
	list_for_each_entry(entry, &acpi_prt.entries, node) {
		if ((segment == entry->id.segment)
		    && (bus == entry->id.bus)
		    && (device == entry->id.device)
		    && (pin == entry->pin)) {
			spin_unlock(&acpi_prt_lock);
			return entry;
		}
	}

	spin_unlock(&acpi_prt_lock);
	return NULL;
}

/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
static struct dmi_system_id medion_md9580[] = {
	{
		.ident = "Medion MD9580-F laptop",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
			DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
		},
	},
	{ }
};

/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
static struct dmi_system_id dell_optiplex[] = {
	{
		.ident = "Dell Optiplex GX1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
		},
	},
	{ }
};

/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
static struct dmi_system_id hp_t5710[] = {
	{
		.ident = "HP t5710",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
			DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
		},
	},
	{ }
};

struct prt_quirk {
	struct dmi_system_id	*system;
	unsigned int		segment;
	unsigned int		bus;
	unsigned int		device;
	unsigned char		pin;
	char			*source;	/* according to BIOS */
	char			*actual_source;
};

/*
 * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 * interrupt at the listed segment/bus/device/pin is connected to the first
 * link device, but it is actually connected to the second.
 */
static struct prt_quirk prt_quirks[] = {
	{ medion_md9580, 0, 0, 9, 'A',
		"\\_SB_.PCI0.ISA_.LNKA",
		"\\_SB_.PCI0.ISA_.LNKB"},
	{ dell_optiplex, 0, 0, 0xd, 'A',
		"\\_SB_.LNKB",
		"\\_SB_.LNKA"},
	{ hp_t5710, 0, 0, 1, 'A',
		"\\_SB_.PCI0.LNK1",
		"\\_SB_.PCI0.LNK3"},
};

static void
do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
{
	int i;
	struct prt_quirk *quirk;

	for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
		quirk = &prt_quirks[i];

		/* All current quirks involve link devices, not GSIs */
		if (!prt->source)
			continue;

		if (dmi_check_system(quirk->system) &&
		    entry->id.segment == quirk->segment &&
		    entry->id.bus == quirk->bus &&
		    entry->id.device == quirk->device &&
		    entry->pin + 'A' == quirk->pin &&
		    !strcmp(prt->source, quirk->source) &&
		    strlen(prt->source) >= strlen(quirk->actual_source)) {
			printk(KERN_WARNING PREFIX "firmware reports "
				"%04x:%02x:%02x PCI INT %c connected to %s; "
				"changing to %s\n",
				entry->id.segment, entry->id.bus,
				entry->id.device, 'A' + entry->pin,
				prt->source, quirk->actual_source);
			strcpy(prt->source, quirk->actual_source);
		}
	}
}

static int
acpi_pci_irq_add_entry(acpi_handle handle,
		       int segment, int bus, struct acpi_pci_routing_table *prt)
{
	struct acpi_prt_entry *entry = NULL;

	entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;

	entry->id.segment = segment;
	entry->id.bus = bus;
	entry->id.device = (prt->address >> 16) & 0xFFFF;
	entry->id.function = prt->address & 0xFFFF;
	entry->pin = prt->pin;

	do_prt_fixups(entry, prt);

	/*
	 * Type 1: Dynamic
	 * ---------------
	 * The 'source' field specifies the PCI interrupt link device used to
	 * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
	 * indicates which resource descriptor in the resource template (of
	 * the link device) this interrupt is allocated from.
	 * 
	 * NOTE: Don't query the Link Device for IRQ information at this time
	 *       because Link Device enumeration may not have occurred yet
	 *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
	 *       namespace).
	 */
	if (prt->source[0]) {
		acpi_get_handle(handle, prt->source, &entry->link.handle);
		entry->link.index = prt->source_index;
	}
	/*
	 * Type 2: Static
	 * --------------
	 * The 'source' field is NULL, and the 'source_index' field specifies
	 * the IRQ value, which is hardwired to specific interrupt inputs on
	 * the interrupt controller.
	 */
	else
		entry->link.index = prt->source_index;

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
			      "      %04x:%02x:%02x[%c] -> %s[%d]\n",
			      entry->id.segment, entry->id.bus,
			      entry->id.device, ('A' + entry->pin), prt->source,
			      entry->link.index));

	spin_lock(&acpi_prt_lock);
	list_add_tail(&entry->node, &acpi_prt.entries);
	acpi_prt.count++;
	spin_unlock(&acpi_prt_lock);

	return 0;
}

static void
acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
{
	if (segment == entry->id.segment && bus == entry->id.bus) {
		acpi_prt.count--;
		list_del(&entry->node);
		kfree(entry);
	}
}

int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
{
	acpi_status status = AE_OK;
	char *pathname = NULL;
	struct acpi_buffer buffer = { 0, NULL };
	struct acpi_pci_routing_table *prt = NULL;
	struct acpi_pci_routing_table *entry = NULL;
	static int first_time = 1;


	pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
		return -ENOMEM;

	if (first_time) {
		acpi_prt.count = 0;
		INIT_LIST_HEAD(&acpi_prt.entries);
		first_time = 0;
	}

	/* 
	 * NOTE: We're given a 'handle' to the _PRT object's parent device
	 *       (either a PCI root bridge or PCI-PCI bridge).
	 */

	buffer.length = ACPI_PATHNAME_MAX;
	buffer.pointer = pathname;
	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

	printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
	       pathname);

	/* 
	 * Evaluate this _PRT and add its entries to our global list (acpi_prt).
	 */

	buffer.length = 0;
	buffer.pointer = NULL;
	kfree(pathname);
	status = acpi_get_irq_routing_table(handle, &buffer);
	if (status != AE_BUFFER_OVERFLOW) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
				acpi_format_exception(status)));
		return -ENODEV;
	}

	prt = kzalloc(buffer.length, GFP_KERNEL);
	if (!prt) {
		return -ENOMEM;
	}
	buffer.pointer = prt;

	status = acpi_get_irq_routing_table(handle, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
				acpi_format_exception(status)));
		kfree(buffer.pointer);
		return -ENODEV;
	}

	entry = prt;

	while (entry && (entry->length > 0)) {
		acpi_pci_irq_add_entry(handle, segment, bus, entry);
		entry = (struct acpi_pci_routing_table *)
		    ((unsigned long)entry + entry->length);
	}

	kfree(prt);

	return 0;
}

void acpi_pci_irq_del_prt(int segment, int bus)
{
	struct list_head *node = NULL, *n = NULL;
	struct acpi_prt_entry *entry = NULL;

	if (!acpi_prt.count) {
		return;
	}

	printk(KERN_DEBUG
	       "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
	       segment, bus);
	spin_lock(&acpi_prt_lock);
	list_for_each_safe(node, n, &acpi_prt.entries) {
		entry = list_entry(node, struct acpi_prt_entry, node);

		acpi_pci_irq_del_entry(segment, bus, entry);
	}
	spin_unlock(&acpi_prt_lock);
}

/* --------------------------------------------------------------------------
                          PCI Interrupt Routing Support
   -------------------------------------------------------------------------- */
typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);

static int
acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
		      int *triggering, int *polarity, char **link)
{
	int irq;


	if (entry->link.handle) {
		irq = acpi_pci_link_allocate_irq(entry->link.handle,
						 entry->link.index, triggering,
						 polarity, link);
		if (irq < 0) {
			printk(KERN_WARNING PREFIX
				      "Invalid IRQ link routing entry\n");
			return -1;
		}
	} else {
		irq = entry->link.index;
		*triggering = ACPI_LEVEL_SENSITIVE;
		*polarity = ACPI_ACTIVE_LOW;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
	return irq;
}

static int
acpi_pci_free_irq(struct acpi_prt_entry *entry,
		  int *triggering, int *polarity, char **link)
{
	int irq;

	if (entry->link.handle) {
		irq = acpi_pci_link_free_irq(entry->link.handle);
	} else {
		irq = entry->link.index;
	}
	return irq;
}

/*
 * acpi_pci_irq_lookup
 * success: return IRQ >= 0
 * failure: return -1
 */
static int
acpi_pci_irq_lookup(struct pci_bus *bus,
		    int device,
		    int pin,
		    int *triggering,
		    int *polarity, char **link, irq_lookup_func func)
{
	struct acpi_prt_entry *entry = NULL;
	int segment = pci_domain_nr(bus);
	int bus_nr = bus->number;
	int ret;


	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
			  segment, bus_nr, device, ('A' + pin)));

	entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
	if (!entry) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
		return -1;
	}

	ret = func(entry, triggering, polarity, link);
	return ret;
}

/*
 * acpi_pci_irq_derive
 * success: return IRQ >= 0
 * failure: return < 0
 */
static int
acpi_pci_irq_derive(struct pci_dev *dev,
		    int pin,
		    int *triggering,
		    int *polarity, char **link, irq_lookup_func func)
{
	struct pci_dev *bridge = dev;
	int irq = -1;
	u8 bridge_pin = 0, orig_pin = pin;


	/* 
	 * Attempt to derive an IRQ for this device from a parent bridge's
	 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
	 */
	while (irq < 0 && bridge->bus->self) {
		pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
		bridge = bridge->bus->self;

		if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
			/* PC card has the same IRQ as its cardbridge */
			bridge_pin = bridge->pin;
			if (!bridge_pin) {
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "No interrupt pin configured for device %s\n",
						  pci_name(bridge)));
				return -1;
			}
			/* Pin is from 0 to 3 */
			bridge_pin--;
			pin = bridge_pin;
		}

		irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
					  pin, triggering, polarity,
					  link, func);
	}

	if (irq < 0) {
		dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
			 'A' + orig_pin);
		return -1;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
			  irq, pci_name(dev), pci_name(bridge)));

	return irq;
}

/*
 * acpi_pci_irq_enable
 * success: return 0
 * failure: return < 0
 */

int acpi_pci_irq_enable(struct pci_dev *dev)
{
	int irq = 0;
	u8 pin = 0;
	int triggering = ACPI_LEVEL_SENSITIVE;
	int polarity = ACPI_ACTIVE_LOW;
	char *link = NULL;
	char link_desc[16];
	int rc;


	pin = dev->pin;
	if (!pin) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "No interrupt pin configured for device %s\n",
				  pci_name(dev)));
		return 0;
	}
	pin--;

	/* 
	 * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
	 * values override any BIOS-assigned IRQs set during boot.
	 */
	irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
				  &triggering, &polarity, &link,
				  acpi_pci_allocate_irq);

	/*
	 * If no PRT entry was found, we'll try to derive an IRQ from the
	 * device's parent bridge.
	 */
	if (irq < 0)
		irq = acpi_pci_irq_derive(dev, pin, &triggering,
					  &polarity, &link,
					  acpi_pci_allocate_irq);

	if (irq < 0) {
		/*
		 * IDE legacy mode controller IRQs are magic. Why do compat
		 * extensions always make such a nasty mess.
		 */
		if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
				(dev->class & 0x05) == 0)
			return 0;
	}
	/*
	 * No IRQ known to the ACPI subsystem - maybe the BIOS / 
	 * driver reported one, then use it. Exit in any case.
	 */
	if (irq < 0) {
		dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
		/* Interrupt Line values above 0xF are forbidden */
		if (dev->irq > 0 && (dev->irq <= 0xF)) {
			printk(" - using IRQ %d\n", dev->irq);
			acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
					  ACPI_ACTIVE_LOW);
			return 0;
		} else {
			printk("\n");
			return 0;
		}
	}

	rc = acpi_register_gsi(irq, triggering, polarity);
	if (rc < 0) {
		dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
			 'A' + pin);
		return rc;
	}
	dev->irq = rc;

	if (link)
		snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
	else
		link_desc[0] = '\0';

	dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
		 'A' + pin, link_desc, irq,
		 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
		 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);

	return 0;
}

/* FIXME: implement x86/x86_64 version */
void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
{
}

void acpi_pci_irq_disable(struct pci_dev *dev)
{
	int gsi = 0;
	u8 pin = 0;
	int triggering = ACPI_LEVEL_SENSITIVE;
	int polarity = ACPI_ACTIVE_LOW;


	pin = dev->pin;
	if (!pin)
		return;
	pin--;

	/*
	 * First we check the PCI IRQ routing table (PRT) for an IRQ.
	 */
	gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
				  &triggering, &polarity, NULL,
				  acpi_pci_free_irq);
	/*
	 * If no PRT entry was found, we'll try to derive an IRQ from the
	 * device's parent bridge.
	 */
	if (gsi < 0)
		gsi = acpi_pci_irq_derive(dev, pin,
					  &triggering, &polarity, NULL,
					  acpi_pci_free_irq);
	if (gsi < 0)
		return;

	/*
	 * TBD: It might be worth clearing dev->irq by magic constant
	 * (e.g. PCI_UNDEFINED_IRQ).
	 */

	dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
	acpi_unregister_gsi(gsi);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
	7	*
	8	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or (at
	13	* your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License along
	21	* with this program; if not, write to the Free Software Foundation, Inc.,
	22	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	23	*
	24	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	25	*/
	26
1da177e4	27
391df5dc	28	#include <linux/dmi.h>
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/module.h>
	31	#include <linux/init.h>
	32	#include <linux/types.h>
	33	#include <linux/proc_fs.h>
	34	#include <linux/spinlock.h>
	35	#include <linux/pm.h>
	36	#include <linux/pci.h>
	37	#include <linux/acpi.h>
	38	#include <acpi/acpi_bus.h>
	39	#include <acpi/acpi_drivers.h>
	40
1da177e4	41	#define _COMPONENT ACPI_PCI_COMPONENT
f52fd66d	42	ACPI_MODULE_NAME("pci_irq");
1da177e4	43
4be44fcd	44	static struct acpi_prt_list acpi_prt;
1da177e4 LT	45	static DEFINE_SPINLOCK(acpi_prt_lock);
	46
	47	/* --------------------------------------------------------------------------
	48	PCI IRQ Routing Table (PRT) Support
	49	-------------------------------------------------------------------------- */
	50
4be44fcd LB	51	static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
	52	int bus,
	53	int device, int pin)
1da177e4	54	{
4be44fcd	55	struct acpi_prt_entry *entry = NULL;
1da177e4	56
1da177e4	57	if (!acpi_prt.count)
d550d98d	58	return NULL;
1da177e4 LT	59
	60	/*
	61	* Parse through all PRT entries looking for a match on the specified
	62	* PCI device's segment, bus, device, and pin (don't care about func).
	63	*
	64	*/
	65	spin_lock(&acpi_prt_lock);
1a3b77ae	66	list_for_each_entry(entry, &acpi_prt.entries, node) {
4be44fcd LB	67	if ((segment == entry->id.segment)
	68	&& (bus == entry->id.bus)
	69	&& (device == entry->id.device)
	70	&& (pin == entry->pin)) {
1da177e4	71	spin_unlock(&acpi_prt_lock);
d550d98d	72	return entry;
1da177e4 LT	73	}
	74	}
	75
	76	spin_unlock(&acpi_prt_lock);
d550d98d	77	return NULL;
1da177e4 LT	78	}
1da177e4 LT	79
391df5dc BH	80	/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
	81	static struct dmi_system_id medion_md9580[] = {
	82	{
	83	.ident = "Medion MD9580-F laptop",
	84	.matches = {
	85	DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
	86	DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
	87	},
	88	},
	89	{ }
	90	};
	91
	92	/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
	93	static struct dmi_system_id dell_optiplex[] = {
	94	{
	95	.ident = "Dell Optiplex GX1",
	96	.matches = {
	97	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
	98	DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
	99	},
	100	},
	101	{ }
	102	};
	103
	104	/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
	105	static struct dmi_system_id hp_t5710[] = {
	106	{
	107	.ident = "HP t5710",
	108	.matches = {
	109	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	110	DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
	111	DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
	112	},
	113	},
	114	{ }
	115	};
	116
	117	struct prt_quirk {
	118	struct dmi_system_id *system;
	119	unsigned int segment;
	120	unsigned int bus;
	121	unsigned int device;
	122	unsigned char pin;
	123	char source; / according to BIOS */
	124	char *actual_source;
	125	};
	126
	127	/*
	128	* These systems have incorrect _PRT entries. The BIOS claims the PCI
	129	* interrupt at the listed segment/bus/device/pin is connected to the first
	130	* link device, but it is actually connected to the second.
	131	*/
	132	static struct prt_quirk prt_quirks[] = {
	133	{ medion_md9580, 0, 0, 9, 'A',
b97d4803 BH	134	"\\_SB_.PCI0.ISA_.LNKA",
b97d4803 BH	135	"\\_SB_.PCI0.ISA_.LNKB"},
391df5dc BH	136	{ dell_optiplex, 0, 0, 0xd, 'A',
	137	"\\_SB_.LNKB",
	138	"\\_SB_.LNKA"},
	139	{ hp_t5710, 0, 0, 1, 'A',
	140	"\\_SB_.PCI0.LNK1",
	141	"\\_SB_.PCI0.LNK3"},
	142	};
	143
	144	static void
	145	do_prt_fixups(struct acpi_prt_entry entry, struct acpi_pci_routing_table prt)
	146	{
	147	int i;
	148	struct prt_quirk *quirk;
	149
	150	for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
	151	quirk = &prt_quirks[i];
	152
	153	/* All current quirks involve link devices, not GSIs */
	154	if (!prt->source)
	155	continue;
	156
	157	if (dmi_check_system(quirk->system) &&
	158	entry->id.segment == quirk->segment &&
	159	entry->id.bus == quirk->bus &&
	160	entry->id.device == quirk->device &&
	161	entry->pin + 'A' == quirk->pin &&
	162	!strcmp(prt->source, quirk->source) &&
	163	strlen(prt->source) >= strlen(quirk->actual_source)) {
	164	printk(KERN_WARNING PREFIX "firmware reports "
c83642d5	165	"%04x:%02x:%02x PCI INT %c connected to %s; "
391df5dc BH	166	"changing to %s\n",
	167	entry->id.segment, entry->id.bus,
	168	entry->id.device, 'A' + entry->pin,
	169	prt->source, quirk->actual_source);
	170	strcpy(prt->source, quirk->actual_source);
	171	}
	172	}
	173	}
	174
1da177e4	175	static int
4be44fcd LB	176	acpi_pci_irq_add_entry(acpi_handle handle,
4be44fcd LB	177	int segment, int bus, struct acpi_pci_routing_table *prt)
1da177e4	178	{
4be44fcd	179	struct acpi_prt_entry *entry = NULL;
1da177e4	180
36bcbec7	181	entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
1da177e4	182	if (!entry)
d550d98d	183	return -ENOMEM;
1da177e4 LT	184
	185	entry->id.segment = segment;
	186	entry->id.bus = bus;
	187	entry->id.device = (prt->address >> 16) & 0xFFFF;
	188	entry->id.function = prt->address & 0xFFFF;
	189	entry->pin = prt->pin;
	190
391df5dc BH	191	do_prt_fixups(entry, prt);
391df5dc BH	192
1da177e4 LT	193	/*
	194	* Type 1: Dynamic
	195	* ---------------
	196	* The 'source' field specifies the PCI interrupt link device used to
	197	* configure the IRQ assigned to this slot\|dev\|pin. The 'source_index'
	198	* indicates which resource descriptor in the resource template (of
	199	* the link device) this interrupt is allocated from.
	200	*
	201	* NOTE: Don't query the Link Device for IRQ information at this time
	202	* because Link Device enumeration may not have occurred yet
	203	* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
	204	* namespace).
	205	*/
	206	if (prt->source[0]) {
	207	acpi_get_handle(handle, prt->source, &entry->link.handle);
	208	entry->link.index = prt->source_index;
	209	}
	210	/*
	211	* Type 2: Static
	212	* --------------
	213	* The 'source' field is NULL, and the 'source_index' field specifies
	214	* the IRQ value, which is hardwired to specific interrupt inputs on
	215	* the interrupt controller.
	216	*/
	217	else
	218	entry->link.index = prt->source_index;
	219
	220	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
21a53283	221	" %04x:%02x:%02x[%c] -> %s[%d]\n",
4be44fcd LB	222	entry->id.segment, entry->id.bus,
	223	entry->id.device, ('A' + entry->pin), prt->source,
	224	entry->link.index));
1da177e4 LT	225
	226	spin_lock(&acpi_prt_lock);
	227	list_add_tail(&entry->node, &acpi_prt.entries);
	228	acpi_prt.count++;
	229	spin_unlock(&acpi_prt_lock);
	230
d550d98d	231	return 0;
1da177e4 LT	232	}
1da177e4 LT	233
1da177e4	234	static void
4be44fcd	235	acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
1da177e4	236	{
4be44fcd	237	if (segment == entry->id.segment && bus == entry->id.bus) {
1da177e4 LT	238	acpi_prt.count--;
	239	list_del(&entry->node);
	240	kfree(entry);
	241	}
	242	}
	243
4be44fcd	244	int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
1da177e4	245	{
4be44fcd LB	246	acpi_status status = AE_OK;
	247	char *pathname = NULL;
	248	struct acpi_buffer buffer = { 0, NULL };
	249	struct acpi_pci_routing_table *prt = NULL;
	250	struct acpi_pci_routing_table *entry = NULL;
	251	static int first_time = 1;
1da177e4	252
1da177e4	253
36bcbec7	254	pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
4be44fcd	255	if (!pathname)
d550d98d	256	return -ENOMEM;
1da177e4 LT	257
	258	if (first_time) {
	259	acpi_prt.count = 0;
	260	INIT_LIST_HEAD(&acpi_prt.entries);
	261	first_time = 0;
	262	}
	263
	264	/*
	265	* NOTE: We're given a 'handle' to the _PRT object's parent device
	266	* (either a PCI root bridge or PCI-PCI bridge).
	267	*/
	268
	269	buffer.length = ACPI_PATHNAME_MAX;
	270	buffer.pointer = pathname;
	271	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	272
	273	printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
4be44fcd	274	pathname);
1da177e4 LT	275
	276	/*
	277	* Evaluate this _PRT and add its entries to our global list (acpi_prt).
	278	*/
	279
	280	buffer.length = 0;
	281	buffer.pointer = NULL;
	282	kfree(pathname);
	283	status = acpi_get_irq_routing_table(handle, &buffer);
	284	if (status != AE_BUFFER_OVERFLOW) {
a6fc6720 TR	285	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
a6fc6720 TR	286	acpi_format_exception(status)));
d550d98d	287	return -ENODEV;
1da177e4 LT	288	}
1da177e4 LT	289
36bcbec7	290	prt = kzalloc(buffer.length, GFP_KERNEL);
4be44fcd	291	if (!prt) {
d550d98d	292	return -ENOMEM;
1da177e4	293	}
1da177e4 LT	294	buffer.pointer = prt;
	295
	296	status = acpi_get_irq_routing_table(handle, &buffer);
	297	if (ACPI_FAILURE(status)) {
a6fc6720 TR	298	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
a6fc6720 TR	299	acpi_format_exception(status)));
1da177e4	300	kfree(buffer.pointer);
d550d98d	301	return -ENODEV;
1da177e4 LT	302	}
	303
	304	entry = prt;
	305
	306	while (entry && (entry->length > 0)) {
	307	acpi_pci_irq_add_entry(handle, segment, bus, entry);
	308	entry = (struct acpi_pci_routing_table *)
4be44fcd	309	((unsigned long)entry + entry->length);
1da177e4 LT	310	}
	311
	312	kfree(prt);
	313
d550d98d	314	return 0;
1da177e4 LT	315	}
1da177e4 LT	316
4be44fcd	317	void acpi_pci_irq_del_prt(int segment, int bus)
1da177e4	318	{
4be44fcd LB	319	struct list_head node = NULL, n = NULL;
4be44fcd LB	320	struct acpi_prt_entry *entry = NULL;
1da177e4	321
4be44fcd	322	if (!acpi_prt.count) {
1da177e4 LT	323	return;
	324	}
	325
4be44fcd	326	printk(KERN_DEBUG
21a53283 BH	327	"ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
21a53283 BH	328	segment, bus);
1da177e4 LT	329	spin_lock(&acpi_prt_lock);
	330	list_for_each_safe(node, n, &acpi_prt.entries) {
	331	entry = list_entry(node, struct acpi_prt_entry, node);
	332
	333	acpi_pci_irq_del_entry(segment, bus, entry);
	334	}
	335	spin_unlock(&acpi_prt_lock);
	336	}
4be44fcd	337
1da177e4 LT	338	/* --------------------------------------------------------------------------
	339	PCI Interrupt Routing Support
	340	-------------------------------------------------------------------------- */
4be44fcd	341	typedef int (irq_lookup_func) (struct acpi_prt_entry , int , int , char **);
1da177e4	342
87bec66b DSL	343	static int
87bec66b DSL	344	acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
50eca3eb	345	int triggering, int polarity, char **link)
87bec66b	346	{
4be44fcd	347	int irq;
87bec66b	348
87bec66b DSL	349
	350	if (entry->link.handle) {
	351	irq = acpi_pci_link_allocate_irq(entry->link.handle,
50eca3eb BM	352	entry->link.index, triggering,
50eca3eb BM	353	polarity, link);
87bec66b	354	if (irq < 0) {
cece9296 LB	355	printk(KERN_WARNING PREFIX
cece9296 LB	356	"Invalid IRQ link routing entry\n");
d550d98d	357	return -1;
87bec66b DSL	358	}
	359	} else {
	360	irq = entry->link.index;
50eca3eb BM	361	*triggering = ACPI_LEVEL_SENSITIVE;
50eca3eb BM	362	*polarity = ACPI_ACTIVE_LOW;
87bec66b DSL	363	}
	364
	365	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
d550d98d	366	return irq;
87bec66b DSL	367	}
	368
	369	static int
	370	acpi_pci_free_irq(struct acpi_prt_entry *entry,
50eca3eb	371	int triggering, int polarity, char **link)
87bec66b	372	{
4be44fcd	373	int irq;
87bec66b	374
87bec66b DSL	375	if (entry->link.handle) {
	376	irq = acpi_pci_link_free_irq(entry->link.handle);
	377	} else {
	378	irq = entry->link.index;
	379	}
d550d98d	380	return irq;
87bec66b	381	}
4be44fcd	382
1da177e4 LT	383	/*
	384	* acpi_pci_irq_lookup
	385	* success: return IRQ >= 0
	386	* failure: return -1
	387	*/
	388	static int
4be44fcd LB	389	acpi_pci_irq_lookup(struct pci_bus *bus,
	390	int device,
	391	int pin,
50eca3eb BM	392	int *triggering,
50eca3eb BM	393	int polarity, char *link, irq_lookup_func func)
1da177e4	394	{
4be44fcd	395	struct acpi_prt_entry *entry = NULL;
1da177e4 LT	396	int segment = pci_domain_nr(bus);
1da177e4 LT	397	int bus_nr = bus->number;
87bec66b	398	int ret;
1da177e4	399
1da177e4	400
4be44fcd	401	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
21a53283	402	"Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
4be44fcd	403	segment, bus_nr, device, ('A' + pin)));
1da177e4	404
4be44fcd	405	entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
1da177e4	406	if (!entry) {
21a53283	407	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
d550d98d	408	return -1;
1da177e4	409	}
4be44fcd	410
50eca3eb	411	ret = func(entry, triggering, polarity, link);
d550d98d	412	return ret;
1da177e4 LT	413	}
	414
	415	/*
	416	* acpi_pci_irq_derive
	417	* success: return IRQ >= 0
	418	* failure: return < 0
	419	*/
	420	static int
4be44fcd LB	421	acpi_pci_irq_derive(struct pci_dev *dev,
4be44fcd LB	422	int pin,
50eca3eb BM	423	int *triggering,
50eca3eb BM	424	int polarity, char *link, irq_lookup_func func)
1da177e4	425	{
4be44fcd LB	426	struct pci_dev *bridge = dev;
4be44fcd LB	427	int irq = -1;
c83642d5	428	u8 bridge_pin = 0, orig_pin = pin;
1da177e4	429
1da177e4	430
1da177e4 LT	431	/*
	432	* Attempt to derive an IRQ for this device from a parent bridge's
	433	* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
	434	*/
	435	while (irq < 0 && bridge->bus->self) {
	436	pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
	437	bridge = bridge->bus->self;
	438
	439	if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
	440	/* PC card has the same IRQ as its cardbridge */
8015a014	441	bridge_pin = bridge->pin;
1da177e4	442	if (!bridge_pin) {
4be44fcd LB	443	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	444	"No interrupt pin configured for device %s\n",
	445	pci_name(bridge)));
d550d98d	446	return -1;
1da177e4 LT	447	}
1da177e4 LT	448	/* Pin is from 0 to 3 */
4be44fcd	449	bridge_pin--;
1da177e4 LT	450	pin = bridge_pin;
	451	}
	452
	453	irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
50eca3eb	454	pin, triggering, polarity,
4be44fcd	455	link, func);
1da177e4 LT	456	}
	457
	458	if (irq < 0) {
c83642d5 BH	459	dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
c83642d5 BH	460	'A' + orig_pin);
d550d98d	461	return -1;
1da177e4 LT	462	}
	463
	464	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
4be44fcd	465	irq, pci_name(dev), pci_name(bridge)));
1da177e4	466
d550d98d	467	return irq;
1da177e4 LT	468	}
	469
	470	/*
	471	* acpi_pci_irq_enable
	472	* success: return 0
	473	* failure: return < 0
	474	*/
	475
4be44fcd	476	int acpi_pci_irq_enable(struct pci_dev *dev)
1da177e4	477	{
4be44fcd LB	478	int irq = 0;
4be44fcd LB	479	u8 pin = 0;
50eca3eb BM	480	int triggering = ACPI_LEVEL_SENSITIVE;
50eca3eb BM	481	int polarity = ACPI_ACTIVE_LOW;
4be44fcd	482	char *link = NULL;
c83642d5	483	char link_desc[16];
4be44fcd	484	int rc;
1da177e4	485
1da177e4	486
8015a014	487	pin = dev->pin;
1da177e4	488	if (!pin) {
4be44fcd LB	489	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	490	"No interrupt pin configured for device %s\n",
	491	pci_name(dev)));
d550d98d	492	return 0;
1da177e4 LT	493	}
	494	pin--;
	495
1da177e4 LT	496	/*
	497	* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
	498	* values override any BIOS-assigned IRQs set during boot.
	499	*/
4be44fcd	500	irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
50eca3eb	501	&triggering, &polarity, &link,
4be44fcd	502	acpi_pci_allocate_irq);
1da177e4 LT	503
	504	/*
	505	* If no PRT entry was found, we'll try to derive an IRQ from the
	506	* device's parent bridge.
	507	*/
	508	if (irq < 0)
50eca3eb BM	509	irq = acpi_pci_irq_derive(dev, pin, &triggering,
50eca3eb BM	510	&polarity, &link,
4be44fcd LB	511	acpi_pci_allocate_irq);
4be44fcd LB	512
96c2a876 AC	513	if (irq < 0) {
	514	/*
	515	* IDE legacy mode controller IRQs are magic. Why do compat
	516	* extensions always make such a nasty mess.
	517	*/
	518	if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
	519	(dev->class & 0x05) == 0)
	520	return 0;
	521	}
1da177e4 LT	522	/*
	523	* No IRQ known to the ACPI subsystem - maybe the BIOS /
	524	* driver reported one, then use it. Exit in any case.
	525	*/
	526	if (irq < 0) {
c83642d5	527	dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
1da177e4	528	/* Interrupt Line values above 0xF are forbidden */
44f8e1a2	529	if (dev->irq > 0 && (dev->irq <= 0xF)) {
1da177e4	530	printk(" - using IRQ %d\n", dev->irq);
4be44fcd LB	531	acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
4be44fcd LB	532	ACPI_ACTIVE_LOW);
d550d98d	533	return 0;
4be44fcd	534	} else {
1da177e4	535	printk("\n");
d550d98d	536	return 0;
1da177e4	537	}
4be44fcd	538	}
1da177e4	539
50eca3eb	540	rc = acpi_register_gsi(irq, triggering, polarity);
349f0d56	541	if (rc < 0) {
c83642d5 BH	542	dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
c83642d5 BH	543	'A' + pin);
d550d98d	544	return rc;
349f0d56 KK	545	}
349f0d56 KK	546	dev->irq = rc;
1da177e4	547
1da177e4	548	if (link)
c83642d5 BH	549	snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
	550	else
	551	link_desc[0] = '\0';
1da177e4	552
c83642d5 BH	553	dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
	554	'A' + pin, link_desc, irq,
	555	(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
	556	(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
1da177e4	557
d550d98d	558	return 0;
1da177e4	559	}
1da177e4	560
87bec66b	561	/* FIXME: implement x86/x86_64 version */
4be44fcd LB	562	void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
	563	{
	564	}
87bec66b	565
4be44fcd	566	void acpi_pci_irq_disable(struct pci_dev *dev)
1da177e4	567	{
4be44fcd LB	568	int gsi = 0;
4be44fcd LB	569	u8 pin = 0;
50eca3eb BM	570	int triggering = ACPI_LEVEL_SENSITIVE;
50eca3eb BM	571	int polarity = ACPI_ACTIVE_LOW;
1da177e4	572
1da177e4	573
8015a014	574	pin = dev->pin;
1da177e4	575	if (!pin)
d550d98d	576	return;
1da177e4 LT	577	pin--;
1da177e4 LT	578
1da177e4 LT	579	/*
	580	* First we check the PCI IRQ routing table (PRT) for an IRQ.
	581	*/
4be44fcd	582	gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
50eca3eb	583	&triggering, &polarity, NULL,
4be44fcd	584	acpi_pci_free_irq);
1da177e4 LT	585	/*
	586	* If no PRT entry was found, we'll try to derive an IRQ from the
	587	* device's parent bridge.
	588	*/
	589	if (gsi < 0)
4be44fcd	590	gsi = acpi_pci_irq_derive(dev, pin,
50eca3eb	591	&triggering, &polarity, NULL,
4be44fcd	592	acpi_pci_free_irq);
1da177e4	593	if (gsi < 0)
d550d98d	594	return;
1da177e4 LT	595
	596	/*
	597	* TBD: It might be worth clearing dev->irq by magic constant
	598	* (e.g. PCI_UNDEFINED_IRQ).
	599	*/
	600
c83642d5	601	dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
1da177e4	602	acpi_unregister_gsi(gsi);
1da177e4	603	}