i386: move pci

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1173 insertions, 0 deletions

diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
new file mode 100644
index 000000000000..8434f2323b87
--- /dev/null
+++ b/arch/x86/pci/irq.c
@@ -0,0 +1,1173 @@
+/*
+ *	Low-Level PCI Support for PC -- Routing of Interrupts
+ *
+ *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/dmi.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/io_apic.h>
+#include <linux/irq.h>
+#include <linux/acpi.h>
+
+#include "pci.h"
+
+#define PIRQ_SIGNATURE	(('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
+#define PIRQ_VERSION 0x0100
+
+static int broken_hp_bios_irq9;
+static int acer_tm360_irqrouting;
+
+static struct irq_routing_table *pirq_table;
+
+static int pirq_enable_irq(struct pci_dev *dev);
+
+/*
+ * Never use: 0, 1, 2 (timer, keyboard, and cascade)
+ * Avoid using: 13, 14 and 15 (FP error and IDE).
+ * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
+ */
+unsigned int pcibios_irq_mask = 0xfff8;
+
+static int pirq_penalty[16] = {
+	1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
+	0, 0, 0, 0, 1000, 100000, 100000, 100000
+};
+
+struct irq_router {
+	char *name;
+	u16 vendor, device;
+	int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
+	int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
+};
+
+struct irq_router_handler {
+	u16 vendor;
+	int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
+};
+
+int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
+void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;
+
+/*
+ *  Check passed address for the PCI IRQ Routing Table signature
+ *  and perform checksum verification.
+ */
+
+static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr)
+{
+	struct irq_routing_table *rt;
+	int i;
+	u8 sum;
+
+	rt = (struct irq_routing_table *) addr;
+	if (rt->signature != PIRQ_SIGNATURE ||
+	    rt->version != PIRQ_VERSION ||
+	    rt->size % 16 ||
+	    rt->size < sizeof(struct irq_routing_table))
+		return NULL;
+	sum = 0;
+	for (i=0; i < rt->size; i++)
+		sum += addr[i];
+	if (!sum) {
+		DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n", rt);
+		return rt;
+	}
+	return NULL;
+}
+
+
+
+/*
+ *  Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
+ */
+
+static struct irq_routing_table * __init pirq_find_routing_table(void)
+{
+	u8 *addr;
+	struct irq_routing_table *rt;
+
+	if (pirq_table_addr) {
+		rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
+		if (rt)
+			return rt;
+		printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
+	}
+	for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
+		rt = pirq_check_routing_table(addr);
+		if (rt)
+			return rt;
+	}
+	return NULL;
+}
+
+/*
+ *  If we have a IRQ routing table, use it to search for peer host
+ *  bridges.  It's a gross hack, but since there are no other known
+ *  ways how to get a list of buses, we have to go this way.
+ */
+
+static void __init pirq_peer_trick(void)
+{
+	struct irq_routing_table *rt = pirq_table;
+	u8 busmap[256];
+	int i;
+	struct irq_info *e;
+
+	memset(busmap, 0, sizeof(busmap));
+	for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
+		e = &rt->slots[i];
+#ifdef DEBUG
+		{
+			int j;
+			DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
+			for(j=0; j<4; j++)
+				DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
+			DBG("\n");
+		}
+#endif
+		busmap[e->bus] = 1;
+	}
+	for(i = 1; i < 256; i++) {
+		if (!busmap[i] || pci_find_bus(0, i))
+			continue;
+		if (pci_scan_bus_with_sysdata(i))
+			printk(KERN_INFO "PCI: Discovered primary peer "
+			       "bus %02x [IRQ]\n", i);
+	}
+	pcibios_last_bus = -1;
+}
+
+/*
+ *  Code for querying and setting of IRQ routes on various interrupt routers.
+ */
+
+void eisa_set_level_irq(unsigned int irq)
+{
+	unsigned char mask = 1 << (irq & 7);
+	unsigned int port = 0x4d0 + (irq >> 3);
+	unsigned char val;
+	static u16 eisa_irq_mask;
+
+	if (irq >= 16 || (1 << irq) & eisa_irq_mask)
+		return;
+
+	eisa_irq_mask |= (1 << irq);
+	printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
+	val = inb(port);
+	if (!(val & mask)) {
+		DBG(KERN_DEBUG " -> edge");
+		outb(val | mask, port);
+	}
+}
+
+/*
+ * Common IRQ routing practice: nybbles in config space,
+ * offset by some magic constant.
+ */
+static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
+{
+	u8 x;
+	unsigned reg = offset + (nr >> 1);
+
+	pci_read_config_byte(router, reg, &x);
+	return (nr & 1) ? (x >> 4) : (x & 0xf);
+}
+
+static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
+{
+	u8 x;
+	unsigned reg = offset + (nr >> 1);
+
+	pci_read_config_byte(router, reg, &x);
+	x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
+	pci_write_config_byte(router, reg, x);
+}
+
+/*
+ * ALI pirq entries are damn ugly, and completely undocumented.
+ * This has been figured out from pirq tables, and it's not a pretty
+ * picture.
+ */
+static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
+
+	return irqmap[read_config_nybble(router, 0x48, pirq-1)];
+}
+
+static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
+	unsigned int val = irqmap[irq];
+		
+	if (val) {
+		write_config_nybble(router, 0x48, pirq-1, val);
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
+ * just a pointer to the config space.
+ */
+static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	u8 x;
+
+	pci_read_config_byte(router, pirq, &x);
+	return (x < 16) ? x : 0;
+}
+
+static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	pci_write_config_byte(router, pirq, irq);
+	return 1;
+}
+
+/*
+ * The VIA pirq rules are nibble-based, like ALI,
+ * but without the ugly irq number munging.
+ * However, PIRQD is in the upper instead of lower 4 bits.
+ */
+static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
+}
+
+static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
+	return 1;
+}
+
+/*
+ * The VIA pirq rules are nibble-based, like ALI,
+ * but without the ugly irq number munging.
+ * However, for 82C586, nibble map is different .
+ */
+static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
+	return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
+}
+
+static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
+	write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
+	return 1;
+}
+
+/*
+ * ITE 8330G pirq rules are nibble-based
+ * FIXME: pirqmap may be { 1, 0, 3, 2 },
+ * 	  2+3 are both mapped to irq 9 on my system
+ */
+static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
+	return read_config_nybble(router,0x43, pirqmap[pirq-1]);
+}
+
+static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
+	write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
+	return 1;
+}
+
+/*
+ * OPTI: high four bits are nibble pointer..
+ * I wonder what the low bits do?
+ */
+static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	return read_config_nybble(router, 0xb8, pirq >> 4);
+}
+
+static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	write_config_nybble(router, 0xb8, pirq >> 4, irq);
+	return 1;
+}
+
+/*
+ * Cyrix: nibble offset 0x5C
+ * 0x5C bits 7:4 is INTB bits 3:0 is INTA 
+ * 0x5D bits 7:4 is INTD bits 3:0 is INTC
+ */
+static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	return read_config_nybble(router, 0x5C, (pirq-1)^1);
+}
+
+static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
+	return 1;
+}
+
+/*
+ *	PIRQ routing for SiS 85C503 router used in several SiS chipsets.
+ *	We have to deal with the following issues here:
+ *	- vendors have different ideas about the meaning of link values
+ *	- some onboard devices (integrated in the chipset) have special
+ *	  links and are thus routed differently (i.e. not via PCI INTA-INTD)
+ *	- different revision of the router have a different layout for
+ *	  the routing registers, particularly for the onchip devices
+ *
+ *	For all routing registers the common thing is we have one byte
+ *	per routeable link which is defined as:
+ *		 bit 7      IRQ mapping enabled (0) or disabled (1)
+ *		 bits [6:4] reserved (sometimes used for onchip devices)
+ *		 bits [3:0] IRQ to map to
+ *		     allowed: 3-7, 9-12, 14-15
+ *		     reserved: 0, 1, 2, 8, 13
+ *
+ *	The config-space registers located at 0x41/0x42/0x43/0x44 are
+ *	always used to route the normal PCI INT A/B/C/D respectively.
+ *	Apparently there are systems implementing PCI routing table using
+ *	link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
+ *	We try our best to handle both link mappings.
+ *	
+ *	Currently (2003-05-21) it appears most SiS chipsets follow the
+ *	definition of routing registers from the SiS-5595 southbridge.
+ *	According to the SiS 5595 datasheets the revision id's of the
+ *	router (ISA-bridge) should be 0x01 or 0xb0.
+ *
+ *	Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
+ *	Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
+ *	They seem to work with the current routing code. However there is
+ *	some concern because of the two USB-OHCI HCs (original SiS 5595
+ *	had only one). YMMV.
+ *
+ *	Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
+ *
+ *	0x61:	IDEIRQ:
+ *		bits [6:5] must be written 01
+ *		bit 4 channel-select primary (0), secondary (1)
+ *
+ *	0x62:	USBIRQ:
+ *		bit 6 OHCI function disabled (0), enabled (1)
+ *	
+ *	0x6a:	ACPI/SCI IRQ: bits 4-6 reserved
+ *
+ *	0x7e:	Data Acq. Module IRQ - bits 4-6 reserved
+ *
+ *	We support USBIRQ (in addition to INTA-INTD) and keep the
+ *	IDE, ACPI and DAQ routing untouched as set by the BIOS.
+ *
+ *	Currently the only reported exception is the new SiS 65x chipset
+ *	which includes the SiS 69x southbridge. Here we have the 85C503
+ *	router revision 0x04 and there are changes in the register layout
+ *	mostly related to the different USB HCs with USB 2.0 support.
+ *
+ *	Onchip routing for router rev-id 0x04 (try-and-error observation)
+ *
+ *	0x60/0x61/0x62/0x63:	1xEHCI and 3xOHCI (companion) USB-HCs
+ *				bit 6-4 are probably unused, not like 5595
+ */
+
+#define PIRQ_SIS_IRQ_MASK	0x0f
+#define PIRQ_SIS_IRQ_DISABLE	0x80
+#define PIRQ_SIS_USB_ENABLE	0x40
+
+static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	u8 x;
+	int reg;
+
+	reg = pirq;
+	if (reg >= 0x01 && reg <= 0x04)
+		reg += 0x40;
+	pci_read_config_byte(router, reg, &x);
+	return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
+}
+
+static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	u8 x;
+	int reg;
+
+	reg = pirq;
+	if (reg >= 0x01 && reg <= 0x04)
+		reg += 0x40;
+	pci_read_config_byte(router, reg, &x);
+	x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
+	x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
+	pci_write_config_byte(router, reg, x);
+	return 1;
+}
+
+
+/*
+ * VLSI: nibble offset 0x74 - educated guess due to routing table and
+ *       config space of VLSI 82C534 PCI-bridge/router (1004:0102)
+ *       Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
+ *       devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
+ *       for the busbridge to the docking station.
+ */
+
+static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	if (pirq > 8) {
+		printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
+		return 0;
+	}
+	return read_config_nybble(router, 0x74, pirq-1);
+}
+
+static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	if (pirq > 8) {
+		printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
+		return 0;
+	}
+	write_config_nybble(router, 0x74, pirq-1, irq);
+	return 1;
+}
+
+/*
+ * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
+ * and Redirect I/O registers (0x0c00 and 0x0c01).  The Index register
+ * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a.  The Redirect
+ * register is a straight binary coding of desired PIC IRQ (low nibble).
+ *
+ * The 'link' value in the PIRQ table is already in the correct format
+ * for the Index register.  There are some special index values:
+ * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
+ * and 0x03 for SMBus.
+ */
+static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	outb_p(pirq, 0xc00);
+	return inb(0xc01) & 0xf;
+}
+
+static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	outb_p(pirq, 0xc00);
+	outb_p(irq, 0xc01);
+	return 1;
+}
+
+/* Support for AMD756 PCI IRQ Routing
+ * Jhon H. Caicedo <jhcaiced@osso.org.co>
+ * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
+ * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
+ * The AMD756 pirq rules are nibble-based
+ * offset 0x56 0-3 PIRQA  4-7  PIRQB
+ * offset 0x57 0-3 PIRQC  4-7  PIRQD
+ */
+static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+	u8 irq;
+	irq = 0;
+	if (pirq <= 4)
+	{
+		irq = read_config_nybble(router, 0x56, pirq - 1);
+	}
+	printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\n",
+		dev->vendor, dev->device, pirq, irq);
+	return irq;
+}
+
+static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n", 
+		dev->vendor, dev->device, pirq, irq);
+	if (pirq <= 4)
+	{
+		write_config_nybble(router, 0x56, pirq - 1, irq);
+	}
+	return 1;
+}
+
+#ifdef CONFIG_PCI_BIOS
+
+static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+{
+	struct pci_dev *bridge;
+	int pin = pci_get_interrupt_pin(dev, &bridge);
+	return pcibios_set_irq_routing(bridge, pin, irq);
+}
+
+#endif
+
+static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	static struct pci_device_id __initdata pirq_440gx[] = {
+		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
+		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
+		{ },
+	};
+
+	/* 440GX has a proprietary PIRQ router -- don't use it */
+	if (pci_dev_present(pirq_440gx))
+		return 0;
+
+	switch(device)
+	{
+		case PCI_DEVICE_ID_INTEL_82371FB_0:
+		case PCI_DEVICE_ID_INTEL_82371SB_0:
+		case PCI_DEVICE_ID_INTEL_82371AB_0:
+		case PCI_DEVICE_ID_INTEL_82371MX:
+		case PCI_DEVICE_ID_INTEL_82443MX_0:
+		case PCI_DEVICE_ID_INTEL_82801AA_0:
+		case PCI_DEVICE_ID_INTEL_82801AB_0:
+		case PCI_DEVICE_ID_INTEL_82801BA_0:
+		case PCI_DEVICE_ID_INTEL_82801BA_10:
+		case PCI_DEVICE_ID_INTEL_82801CA_0:
+		case PCI_DEVICE_ID_INTEL_82801CA_12:
+		case PCI_DEVICE_ID_INTEL_82801DB_0:
+		case PCI_DEVICE_ID_INTEL_82801E_0:
+		case PCI_DEVICE_ID_INTEL_82801EB_0:
+		case PCI_DEVICE_ID_INTEL_ESB_1:
+		case PCI_DEVICE_ID_INTEL_ICH6_0:
+		case PCI_DEVICE_ID_INTEL_ICH6_1:
+		case PCI_DEVICE_ID_INTEL_ICH7_0:
+		case PCI_DEVICE_ID_INTEL_ICH7_1:
+		case PCI_DEVICE_ID_INTEL_ICH7_30:
+		case PCI_DEVICE_ID_INTEL_ICH7_31:
+		case PCI_DEVICE_ID_INTEL_ESB2_0:
+		case PCI_DEVICE_ID_INTEL_ICH8_0:
+		case PCI_DEVICE_ID_INTEL_ICH8_1:
+		case PCI_DEVICE_ID_INTEL_ICH8_2:
+		case PCI_DEVICE_ID_INTEL_ICH8_3:
+		case PCI_DEVICE_ID_INTEL_ICH8_4:
+		case PCI_DEVICE_ID_INTEL_ICH9_0:
+		case PCI_DEVICE_ID_INTEL_ICH9_1:
+		case PCI_DEVICE_ID_INTEL_ICH9_2:
+		case PCI_DEVICE_ID_INTEL_ICH9_3:
+		case PCI_DEVICE_ID_INTEL_ICH9_4:
+		case PCI_DEVICE_ID_INTEL_ICH9_5:
+		case PCI_DEVICE_ID_INTEL_TOLAPAI_0:
+			r->name = "PIIX/ICH";
+			r->get = pirq_piix_get;
+			r->set = pirq_piix_set;
+			return 1;
+	}
+	return 0;
+}
+
+static __init int via_router_probe(struct irq_router *r,
+				struct pci_dev *router, u16 device)
+{
+	/* FIXME: We should move some of the quirk fixup stuff here */
+
+	/*
+	 * work arounds for some buggy BIOSes
+	 */
+	if (device == PCI_DEVICE_ID_VIA_82C586_0) {
+		switch(router->device) {
+		case PCI_DEVICE_ID_VIA_82C686:
+			/*
+			 * Asus k7m bios wrongly reports 82C686A
+			 * as 586-compatible
+			 */
+			device = PCI_DEVICE_ID_VIA_82C686;
+			break;
+		case PCI_DEVICE_ID_VIA_8235:
+			/**
+			 * Asus a7v-x bios wrongly reports 8235
+			 * as 586-compatible
+			 */
+			device = PCI_DEVICE_ID_VIA_8235;
+			break;
+		}
+	}
+
+	switch(device) {
+	case PCI_DEVICE_ID_VIA_82C586_0:
+		r->name = "VIA";
+		r->get = pirq_via586_get;
+		r->set = pirq_via586_set;
+		return 1;
+	case PCI_DEVICE_ID_VIA_82C596:
+	case PCI_DEVICE_ID_VIA_82C686:
+	case PCI_DEVICE_ID_VIA_8231:
+	case PCI_DEVICE_ID_VIA_8233A:
+	case PCI_DEVICE_ID_VIA_8235:
+	case PCI_DEVICE_ID_VIA_8237:
+		/* FIXME: add new ones for 8233/5 */
+		r->name = "VIA";
+		r->get = pirq_via_get;
+		r->set = pirq_via_set;
+		return 1;
+	}
+	return 0;
+}
+
+static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_VLSI_82C534:
+			r->name = "VLSI 82C534";
+			r->get = pirq_vlsi_get;
+			r->set = pirq_vlsi_set;
+			return 1;
+	}
+	return 0;
+}
+
+
+static __init int serverworks_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_SERVERWORKS_OSB4:
+		case PCI_DEVICE_ID_SERVERWORKS_CSB5:
+			r->name = "ServerWorks";
+			r->get = pirq_serverworks_get;
+			r->set = pirq_serverworks_set;
+			return 1;
+	}
+	return 0;
+}
+
+static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	if (device != PCI_DEVICE_ID_SI_503)
+		return 0;
+		
+	r->name = "SIS";
+	r->get = pirq_sis_get;
+	r->set = pirq_sis_set;
+	return 1;
+}
+
+static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_CYRIX_5520:
+			r->name = "NatSemi";
+			r->get = pirq_cyrix_get;
+			r->set = pirq_cyrix_set;
+			return 1;
+	}
+	return 0;
+}
+
+static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_OPTI_82C700:
+			r->name = "OPTI";
+			r->get = pirq_opti_get;
+			r->set = pirq_opti_set;
+			return 1;
+	}
+	return 0;
+}
+
+static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_ITE_IT8330G_0:
+			r->name = "ITE";
+			r->get = pirq_ite_get;
+			r->set = pirq_ite_set;
+			return 1;
+	}
+	return 0;
+}
+
+static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+	case PCI_DEVICE_ID_AL_M1533:
+	case PCI_DEVICE_ID_AL_M1563:
+		printk(KERN_DEBUG "PCI: Using ALI IRQ Router\n");
+		r->name = "ALI";
+		r->get = pirq_ali_get;
+		r->set = pirq_ali_set;
+		return 1;
+	}
+	return 0;
+}
+
+static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+	switch(device)
+	{
+		case PCI_DEVICE_ID_AMD_VIPER_740B:
+			r->name = "AMD756";
+			break;
+		case PCI_DEVICE_ID_AMD_VIPER_7413:
+			r->name = "AMD766";
+			break;
+		case PCI_DEVICE_ID_AMD_VIPER_7443:
+			r->name = "AMD768";
+			break;
+		default:
+			return 0;
+	}
+	r->get = pirq_amd756_get;
+	r->set = pirq_amd756_set;
+	return 1;
+}
+		
+static __initdata struct irq_router_handler pirq_routers[] = {
+	{ PCI_VENDOR_ID_INTEL, intel_router_probe },
+	{ PCI_VENDOR_ID_AL, ali_router_probe },
+	{ PCI_VENDOR_ID_ITE, ite_router_probe },
+	{ PCI_VENDOR_ID_VIA, via_router_probe },
+	{ PCI_VENDOR_ID_OPTI, opti_router_probe },
+	{ PCI_VENDOR_ID_SI, sis_router_probe },
+	{ PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
+	{ PCI_VENDOR_ID_VLSI, vlsi_router_probe },
+	{ PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
+	{ PCI_VENDOR_ID_AMD, amd_router_probe },
+	/* Someone with docs needs to add the ATI Radeon IGP */
+	{ 0, NULL }
+};
+static struct irq_router pirq_router;
+static struct pci_dev *pirq_router_dev;
+
+
+/*
+ *	FIXME: should we have an option to say "generic for
+ *	chipset" ?
+ */
+ 
+static void __init pirq_find_router(struct irq_router *r)
+{
+	struct irq_routing_table *rt = pirq_table;
+	struct irq_router_handler *h;
+
+#ifdef CONFIG_PCI_BIOS
+	if (!rt->signature) {
+		printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
+		r->set = pirq_bios_set;
+		r->name = "BIOS";
+		return;
+	}
+#endif
+
+	/* Default unless a driver reloads it */
+	r->name = "default";
+	r->get = NULL;
+	r->set = NULL;
+	
+	DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for %04x:%04x\n",
+	    rt->rtr_vendor, rt->rtr_device);
+
+	pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
+	if (!pirq_router_dev) {
+		DBG(KERN_DEBUG "PCI: Interrupt router not found at "
+			"%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
+		return;
+	}
+
+	for( h = pirq_routers; h->vendor; h++) {
+		/* First look for a router match */
+		if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
+			break;
+		/* Fall back to a device match */
+		if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
+			break;
+	}
+	printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
+		pirq_router.name,
+		pirq_router_dev->vendor,
+		pirq_router_dev->device,
+		pci_name(pirq_router_dev));
+
+	/* The device remains referenced for the kernel lifetime */
+}
+
+static struct irq_info *pirq_get_info(struct pci_dev *dev)
+{
+	struct irq_routing_table *rt = pirq_table;
+	int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
+	struct irq_info *info;
+
+	for (info = rt->slots; entries--; info++)
+		if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
+			return info;
+	return NULL;
+}
+
+static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
+{
+	u8 pin;
+	struct irq_info *info;
+	int i, pirq, newirq;
+	int irq = 0;
+	u32 mask;
+	struct irq_router *r = &pirq_router;
+	struct pci_dev *dev2 = NULL;
+	char *msg = NULL;
+
+	/* Find IRQ pin */
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (!pin) {
+		DBG(KERN_DEBUG " -> no interrupt pin\n");
+		return 0;
+	}
+	pin = pin - 1;
+
+	/* Find IRQ routing entry */
+
+	if (!pirq_table)
+		return 0;
+	
+	DBG(KERN_DEBUG "IRQ for %s[%c]", pci_name(dev), 'A' + pin);
+	info = pirq_get_info(dev);
+	if (!info) {
+		DBG(" -> not found in routing table\n" KERN_DEBUG);
+		return 0;
+	}
+	pirq = info->irq[pin].link;
+	mask = info->irq[pin].bitmap;
+	if (!pirq) {
+		DBG(" -> not routed\n" KERN_DEBUG);
+		return 0;
+	}
+	DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
+	mask &= pcibios_irq_mask;
+
+	/* Work around broken HP Pavilion Notebooks which assign USB to
+	   IRQ 9 even though it is actually wired to IRQ 11 */
+
+	if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
+		dev->irq = 11;
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
+		r->set(pirq_router_dev, dev, pirq, 11);
+	}
+
+	/* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
+	if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
+		pirq = 0x68;
+		mask = 0x400;
+		dev->irq = r->get(pirq_router_dev, dev, pirq);
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+	}
+
+	/*
+	 * Find the best IRQ to assign: use the one
+	 * reported by the device if possible.
+	 */
+	newirq = dev->irq;
+	if (newirq && !((1 << newirq) & mask)) {
+		if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
+		else printk("\n" KERN_WARNING
+			"PCI: IRQ %i for device %s doesn't match PIRQ mask "
+			"- try pci=usepirqmask\n" KERN_DEBUG, newirq,
+			pci_name(dev));
+	}
+	if (!newirq && assign) {
+		for (i = 0; i < 16; i++) {
+			if (!(mask & (1 << i)))
+				continue;
+			if (pirq_penalty[i] < pirq_penalty[newirq] && can_request_irq(i, IRQF_SHARED))
+				newirq = i;
+		}
+	}
+	DBG(" -> newirq=%d", newirq);
+
+	/* Check if it is hardcoded */
+	if ((pirq & 0xf0) == 0xf0) {
+		irq = pirq & 0xf;
+		DBG(" -> hardcoded IRQ %d\n", irq);
+		msg = "Hardcoded";
+	} else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
+	((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask)) ) {
+		DBG(" -> got IRQ %d\n", irq);
+		msg = "Found";
+		eisa_set_level_irq(irq);
+	} else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
+		DBG(" -> assigning IRQ %d", newirq);
+		if (r->set(pirq_router_dev, dev, pirq, newirq)) {
+			eisa_set_level_irq(newirq);
+			DBG(" ... OK\n");
+			msg = "Assigned";
+			irq = newirq;
+		}
+	}
+
+	if (!irq) {
+		DBG(" ... failed\n");
+		if (newirq && mask == (1 << newirq)) {
+			msg = "Guessed";
+			irq = newirq;
+		} else
+			return 0;
+	}
+	printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
+
+	/* Update IRQ for all devices with the same pirq value */
+	while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
+		pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
+		if (!pin)
+			continue;
+		pin--;
+		info = pirq_get_info(dev2);
+		if (!info)
+			continue;
+		if (info->irq[pin].link == pirq) {
+			/* We refuse to override the dev->irq information. Give a warning! */
+		    	if ( dev2->irq && dev2->irq != irq && \
+			(!(pci_probe & PCI_USE_PIRQ_MASK) || \
+			((1 << dev2->irq) & mask)) ) {
+#ifndef CONFIG_PCI_MSI
+		    		printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
+				       pci_name(dev2), dev2->irq, irq);
+#endif
+		    		continue;
+		    	}
+			dev2->irq = irq;
+			pirq_penalty[irq]++;
+			if (dev != dev2)
+				printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
+		}
+	}
+	return 1;
+}
+
+static void __init pcibios_fixup_irqs(void)
+{
+	struct pci_dev *dev = NULL;
+	u8 pin;
+
+	DBG(KERN_DEBUG "PCI: IRQ fixup\n");
+	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+		/*
+		 * If the BIOS has set an out of range IRQ number, just ignore it.
+		 * Also keep track of which IRQ's are already in use.
+		 */
+		if (dev->irq >= 16) {
+			DBG(KERN_DEBUG "%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
+			dev->irq = 0;
+		}
+		/* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
+		if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
+			pirq_penalty[dev->irq] = 0;
+		pirq_penalty[dev->irq]++;
+	}
+
+	dev = NULL;
+	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+#ifdef CONFIG_X86_IO_APIC
+		/*
+		 * Recalculate IRQ numbers if we use the I/O APIC.
+		 */
+		if (io_apic_assign_pci_irqs)
+		{
+			int irq;
+
+			if (pin) {
+				pin--;		/* interrupt pins are numbered starting from 1 */
+				irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
+	/*
+	 * Busses behind bridges are typically not listed in the MP-table.
+	 * In this case we have to look up the IRQ based on the parent bus,
+	 * parent slot, and pin number. The SMP code detects such bridged
+	 * busses itself so we should get into this branch reliably.
+	 */
+				if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
+					struct pci_dev * bridge = dev->bus->self;
+
+					pin = (pin + PCI_SLOT(dev->devfn)) % 4;
+					irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number, 
+							PCI_SLOT(bridge->devfn), pin);
+					if (irq >= 0)
+						printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
+							pci_name(bridge), 'A' + pin, irq);
+				}
+				if (irq >= 0) {
+					printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
+						pci_name(dev), 'A' + pin, irq);
+					dev->irq = irq;
+				}
+			}
+		}
+#endif
+		/*
+		 * Still no IRQ? Try to lookup one...
+		 */
+		if (pin && !dev->irq)
+			pcibios_lookup_irq(dev, 0);
+	}
+}
+
+/*
+ * Work around broken HP Pavilion Notebooks which assign USB to
+ * IRQ 9 even though it is actually wired to IRQ 11
+ */
+static int __init fix_broken_hp_bios_irq9(struct dmi_system_id *d)
+{
+	if (!broken_hp_bios_irq9) {
+		broken_hp_bios_irq9 = 1;
+		printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
+	}
+	return 0;
+}
+
+/*
+ * Work around broken Acer TravelMate 360 Notebooks which assign
+ * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
+ */
+static int __init fix_acer_tm360_irqrouting(struct dmi_system_id *d)
+{
+	if (!acer_tm360_irqrouting) {
+		acer_tm360_irqrouting = 1;
+		printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
+	}
+	return 0;
+}
+
+static struct dmi_system_id __initdata pciirq_dmi_table[] = {
+	{
+		.callback = fix_broken_hp_bios_irq9,
+		.ident = "HP Pavilion N5400 Series Laptop",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+			DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
+			DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
+		},
+	},
+	{
+		.callback = fix_acer_tm360_irqrouting,
+		.ident = "Acer TravelMate 36x Laptop",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
+		},
+	},
+	{ }
+};
+
+static int __init pcibios_irq_init(void)
+{
+	DBG(KERN_DEBUG "PCI: IRQ init\n");
+
+	if (pcibios_enable_irq || raw_pci_ops == NULL)
+		return 0;
+
+	dmi_check_system(pciirq_dmi_table);
+
+	pirq_table = pirq_find_routing_table();
+
+#ifdef CONFIG_PCI_BIOS
+	if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
+		pirq_table = pcibios_get_irq_routing_table();
+#endif
+	if (pirq_table) {
+		pirq_peer_trick();
+		pirq_find_router(&pirq_router);
+		if (pirq_table->exclusive_irqs) {
+			int i;
+			for (i=0; i<16; i++)
+				if (!(pirq_table->exclusive_irqs & (1 << i)))
+					pirq_penalty[i] += 100;
+		}
+		/* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
+		if (io_apic_assign_pci_irqs)
+			pirq_table = NULL;
+	}
+
+	pcibios_enable_irq = pirq_enable_irq;
+
+	pcibios_fixup_irqs();
+	return 0;
+}
+
+subsys_initcall(pcibios_irq_init);
+
+
+static void pirq_penalize_isa_irq(int irq, int active)
+{
+	/*
+	 *  If any ISAPnP device reports an IRQ in its list of possible
+	 *  IRQ's, we try to avoid assigning it to PCI devices.
+	 */
+	if (irq < 16) {
+		if (active)
+			pirq_penalty[irq] += 1000;
+		else
+			pirq_penalty[irq] += 100;
+	}
+}
+
+void pcibios_penalize_isa_irq(int irq, int active)
+{
+#ifdef CONFIG_ACPI
+	if (!acpi_noirq)
+		acpi_penalize_isa_irq(irq, active);
+	else
+#endif
+		pirq_penalize_isa_irq(irq, active);
+}
+
+static int pirq_enable_irq(struct pci_dev *dev)
+{
+	u8 pin;
+	struct pci_dev *temp_dev;
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
+		char *msg = "";
+
+		pin--;		/* interrupt pins are numbered starting from 1 */
+
+		if (io_apic_assign_pci_irqs) {
+			int irq;
+
+			irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
+			/*
+			 * Busses behind bridges are typically not listed in the MP-table.
+			 * In this case we have to look up the IRQ based on the parent bus,
+			 * parent slot, and pin number. The SMP code detects such bridged
+			 * busses itself so we should get into this branch reliably.
+			 */
+			temp_dev = dev;
+			while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
+				struct pci_dev * bridge = dev->bus->self;
+
+				pin = (pin + PCI_SLOT(dev->devfn)) % 4;
+				irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number, 
+						PCI_SLOT(bridge->devfn), pin);
+				if (irq >= 0)
+					printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
+						pci_name(bridge), 'A' + pin, irq);
+				dev = bridge;
+			}
+			dev = temp_dev;
+			if (irq >= 0) {
+				printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
+					pci_name(dev), 'A' + pin, irq);
+				dev->irq = irq;
+				return 0;
+			} else
+				msg = " Probably buggy MP table.";
+		} else if (pci_probe & PCI_BIOS_IRQ_SCAN)
+			msg = "";
+		else
+			msg = " Please try using pci=biosirq.";
+
+		/* With IDE legacy devices the IRQ lookup failure is not a problem.. */
+		if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
+			return 0;
+
+		printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
+		       'A' + pin, pci_name(dev), msg);
+	}
+	return 0;
+}