WebSVN - shark - Blame - Rev 1618 - /shark/branches/xen/drivers/pci/irq.c

Rev	Author	Line No.	Line
587	giacomo	1	/*
		2	* Low-Level PCI Support for PC -- Routing of Interrupts
		3	*
		4	* (c) 1999--2000 Martin Mares <mj@ucw.cz>
		5	*/
		6
		7	#include <linuxcomp.h>
		8
		9	#include <linux/config.h>
		10	#include <linux/types.h>
		11	#include <linux/kernel.h>
		12	#include <linux/pci.h>
		13	#include <linux/init.h>
		14	#include <linux/slab.h>
		15	#include <linux/interrupt.h>
		16	#include <linux/irq.h>
		17	#include <asm/io.h>
		18	#include <asm/smp.h>
		19	#include <asm/io_apic.h>
		20
		21	#include "pci2.h"
		22
		23	#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
		24	#define PIRQ_VERSION 0x0100
		25
		26	int broken_hp_bios_irq9;
		27
		28	static struct irq_routing_table *pirq_table;
		29
		30	/*
		31	* Never use: 0, 1, 2 (timer, keyboard, and cascade)
		32	* Avoid using: 13, 14 and 15 (FP error and IDE).
		33	* Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
		34	*/
		35	unsigned int pcibios_irq_mask = 0xfff8;
		36
		37	static int pirq_penalty[16] = {
		38	1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
		39	0, 0, 0, 0, 1000, 100000, 100000, 100000
		40	};
		41
		42	struct irq_router {
		43	char *name;
		44	u16 vendor, device;
		45	int (get)(struct pci_dev router, struct pci_dev *dev, int pirq);
		46	int (set)(struct pci_dev router, struct pci_dev *dev, int pirq, int new);
		47	};
		48
		49	struct irq_router_handler {
		50	u16 vendor;
		51	int (probe)(struct irq_router r, struct pci_dev *router, u16 device);
		52	};
		53
		54	int (pcibios_enable_irq)(struct pci_dev dev) = NULL;
		55
		56	/*
		57	* Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
		58	*/
		59
		60	static struct irq_routing_table * __init pirq_find_routing_table(void)
		61	{
		62	u8 *addr;
		63	struct irq_routing_table *rt;
		64	int i;
		65	u8 sum;
		66
		67	for(addr = (u8 ) __va(0xf0000); addr < (u8 ) __va(0x100000); addr += 16) {
		68	rt = (struct irq_routing_table *) addr;
		69	if (rt->signature != PIRQ_SIGNATURE \|\|
		70	rt->version != PIRQ_VERSION \|\|
		71	rt->size % 16 \|\|
		72	rt->size < sizeof(struct irq_routing_table))
		73	continue;
		74	sum = 0;
		75	for(i=0; i<rt->size; i++)
		76	sum += addr[i];
		77	if (!sum) {
		78	DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
		79	return rt;
		80	}
		81	}
		82	return NULL;
		83	}
		84
		85	/*
		86	* If we have a IRQ routing table, use it to search for peer host
		87	* bridges. It's a gross hack, but since there are no other known
		88	* ways how to get a list of buses, we have to go this way.
		89	*/
		90
		91	static void __init pirq_peer_trick(void)
		92	{
		93	struct irq_routing_table *rt = pirq_table;
		94	u8 busmap[256];
		95	int i;
		96	struct irq_info *e;
		97
		98	memset(busmap, 0, sizeof(busmap));
		99	for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
		100	e = &rt->slots[i];
		101	#ifdef DEBUG
		102	{
		103	int j;
		104	DBG("%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
		105	for(j=0; j<4; j++)
		106	DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
		107	DBG("\n");
		108	}
		109	#endif
		110	busmap[e->bus] = 1;
		111	}
		112	for(i = 1; i < 256; i++) {
		113	if (!busmap[i] \|\| pci_find_bus(0, i))
		114	continue;
		115	if (pci_scan_bus(i, &pci_root_ops, NULL))
		116	printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
		117	}
		118	pcibios_last_bus = -1;
		119	}
		120
		121	/*
		122	* Code for querying and setting of IRQ routes on various interrupt routers.
		123	*/
		124
		125	void eisa_set_level_irq(unsigned int irq)
		126	{
		127	unsigned char mask = 1 << (irq & 7);
		128	unsigned int port = 0x4d0 + (irq >> 3);
		129	unsigned char val = inb(port);
		130
		131	if (!(val & mask)) {
		132	DBG(" -> edge");
		133	outb(val \| mask, port);
		134	}
		135	}
		136
		137	/*
		138	* Common IRQ routing practice: nybbles in config space,
		139	* offset by some magic constant.
		140	*/
		141	static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
		142	{
		143	u8 x;
		144	unsigned reg = offset + (nr >> 1);
		145
		146	pci_read_config_byte(router, reg, &x);
		147	return (nr & 1) ? (x >> 4) : (x & 0xf);
		148	}
		149
		150	static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
		151	{
		152	u8 x;
		153	unsigned reg = offset + (nr >> 1);
		154
		155	pci_read_config_byte(router, reg, &x);
		156	x = (nr & 1) ? ((x & 0x0f) \| (val << 4)) : ((x & 0xf0) \| val);
		157	pci_write_config_byte(router, reg, x);
		158	}
		159
		160	/*
		161	* ALI pirq entries are damn ugly, and completely undocumented.
		162	* This has been figured out from pirq tables, and it's not a pretty
		163	* picture.
		164	*/
		165	static int pirq_ali_get(struct pci_dev router, struct pci_dev dev, int pirq)
		166	{
		167	static unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
		168
		169	return irqmap[read_config_nybble(router, 0x48, pirq-1)];
		170	}
		171
		172	static int pirq_ali_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		173	{
		174	static unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
		175	unsigned int val = irqmap[irq];
		176
		177	if (val) {
		178	write_config_nybble(router, 0x48, pirq-1, val);
		179	return 1;
		180	}
		181	return 0;
		182	}
		183
		184	/*
		185	* The Intel PIIX4 pirq rules are fairly simple: "pirq" is
		186	* just a pointer to the config space.
		187	*/
		188	static int pirq_piix_get(struct pci_dev router, struct pci_dev dev, int pirq)
		189	{
		190	u8 x;
		191
		192	pci_read_config_byte(router, pirq, &x);
		193	return (x < 16) ? x : 0;
		194	}
		195
		196	static int pirq_piix_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		197	{
		198	pci_write_config_byte(router, pirq, irq);
		199	return 1;
		200	}
		201
		202	/*
		203	* The VIA pirq rules are nibble-based, like ALI,
		204	* but without the ugly irq number munging.
		205	* However, PIRQD is in the upper instead of lower 4 bits.
		206	*/
		207	static int pirq_via_get(struct pci_dev router, struct pci_dev dev, int pirq)
		208	{
		209	return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
		210	}
		211
		212	static int pirq_via_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		213	{
		214	write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
		215	return 1;
		216	}
		217
		218	/*
		219	* ITE 8330G pirq rules are nibble-based
		220	* FIXME: pirqmap may be { 1, 0, 3, 2 },
		221	* 2+3 are both mapped to irq 9 on my system
		222	*/
		223	static int pirq_ite_get(struct pci_dev router, struct pci_dev dev, int pirq)
		224	{
		225	static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
		226	return read_config_nybble(router,0x43, pirqmap[pirq-1]);
		227	}
		228
		229	static int pirq_ite_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		230	{
		231	static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
		232	write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
		233	return 1;
		234	}
		235
		236	/*
		237	* OPTI: high four bits are nibble pointer..
		238	* I wonder what the low bits do?
		239	*/
		240	static int pirq_opti_get(struct pci_dev router, struct pci_dev dev, int pirq)
		241	{
		242	return read_config_nybble(router, 0xb8, pirq >> 4);
		243	}
		244
		245	static int pirq_opti_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		246	{
		247	write_config_nybble(router, 0xb8, pirq >> 4, irq);
		248	return 1;
		249	}
		250
		251	/*
		252	* Cyrix: nibble offset 0x5C
		253	* 0x5C bits 7:4 is INTB bits 3:0 is INTA
		254	* 0x5D bits 7:4 is INTD bits 3:0 is INTC
		255	*/
		256	static int pirq_cyrix_get(struct pci_dev router, struct pci_dev dev, int pirq)
		257	{
		258	return read_config_nybble(router, 0x5C, (pirq-1)^1);
		259	}
		260
		261	static int pirq_cyrix_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		262	{
		263	write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
		264	return 1;
		265	}
		266
		267	/*
		268	* PIRQ routing for SiS 85C503 router used in several SiS chipsets.
		269	* We have to deal with the following issues here:
		270	* - vendors have different ideas about the meaning of link values
		271	* - some onboard devices (integrated in the chipset) have special
		272	* links and are thus routed differently (i.e. not via PCI INTA-INTD)
		273	* - different revision of the router have a different layout for
		274	* the routing registers, particularly for the onchip devices
		275	*
		276	* For all routing registers the common thing is we have one byte
		277	* per routeable link which is defined as:
		278	* bit 7 IRQ mapping enabled (0) or disabled (1)
		279	* bits [6:4] reserved (sometimes used for onchip devices)
		280	* bits [3:0] IRQ to map to
		281	* allowed: 3-7, 9-12, 14-15
		282	* reserved: 0, 1, 2, 8, 13
		283	*
		284	* The config-space registers located at 0x41/0x42/0x43/0x44 are
		285	* always used to route the normal PCI INT A/B/C/D respectively.
		286	* Apparently there are systems implementing PCI routing table using
		287	* link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
		288	* We try our best to handle both link mappings.
		289	*
		290	* Currently (2003-05-21) it appears most SiS chipsets follow the
		291	* definition of routing registers from the SiS-5595 southbridge.
		292	* According to the SiS 5595 datasheets the revision id's of the
		293	* router (ISA-bridge) should be 0x01 or 0xb0.
		294	*
		295	* Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
		296	* Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
		297	* They seem to work with the current routing code. However there is
		298	* some concern because of the two USB-OHCI HCs (original SiS 5595
		299	* had only one). YMMV.
		300	*
		301	* Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
		302	*
		303	* 0x61: IDEIRQ:
		304	* bits [6:5] must be written 01
		305	* bit 4 channel-select primary (0), secondary (1)
		306	*
		307	* 0x62: USBIRQ:
		308	* bit 6 OHCI function disabled (0), enabled (1)
		309	*
		310	* 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
		311	*
		312	* 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
		313	*
		314	* We support USBIRQ (in addition to INTA-INTD) and keep the
		315	* IDE, ACPI and DAQ routing untouched as set by the BIOS.
		316	*
		317	* Currently the only reported exception is the new SiS 65x chipset
		318	* which includes the SiS 69x southbridge. Here we have the 85C503
		319	* router revision 0x04 and there are changes in the register layout
		320	* mostly related to the different USB HCs with USB 2.0 support.
		321	*
		322	* Onchip routing for router rev-id 0x04 (try-and-error observation)
		323	*
		324	* 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
		325	* bit 6-4 are probably unused, not like 5595
		326	*/
		327
		328	#define PIRQ_SIS_IRQ_MASK 0x0f
		329	#define PIRQ_SIS_IRQ_DISABLE 0x80
		330	#define PIRQ_SIS_USB_ENABLE 0x40
		331
		332	static int pirq_sis_get(struct pci_dev router, struct pci_dev dev, int pirq)
		333	{
		334	u8 x;
		335	int reg;
		336
		337	reg = pirq;
		338	if (reg >= 0x01 && reg <= 0x04)
		339	reg += 0x40;
		340	pci_read_config_byte(router, reg, &x);
		341	return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
		342	}
		343
		344	static int pirq_sis_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		345	{
		346	u8 x;
		347	int reg;
		348
		349	reg = pirq;
		350	if (reg >= 0x01 && reg <= 0x04)
		351	reg += 0x40;
		352	pci_read_config_byte(router, reg, &x);
		353	x &= ~(PIRQ_SIS_IRQ_MASK \| PIRQ_SIS_IRQ_DISABLE);
		354	x \|= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
		355	pci_write_config_byte(router, reg, x);
		356	return 1;
		357	}
		358
		359
		360	/*
		361	* VLSI: nibble offset 0x74 - educated guess due to routing table and
		362	* config space of VLSI 82C534 PCI-bridge/router (1004:0102)
		363	* Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
		364	* devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
		365	* for the busbridge to the docking station.
		366	*/
		367
		368	static int pirq_vlsi_get(struct pci_dev router, struct pci_dev dev, int pirq)
		369	{
		370	if (pirq > 8) {
		371	printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
		372	return 0;
		373	}
		374	return read_config_nybble(router, 0x74, pirq-1);
		375	}
		376
		377	static int pirq_vlsi_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		378	{
		379	if (pirq > 8) {
		380	printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
		381	return 0;
		382	}
		383	write_config_nybble(router, 0x74, pirq-1, irq);
		384	return 1;
		385	}
		386
		387	/*
		388	* ServerWorks: PCI interrupts mapped to system IRQ lines through Index
		389	* and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
		390	* format is (PCIIRQ## \| 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
		391	* register is a straight binary coding of desired PIC IRQ (low nibble).
		392	*
		393	* The 'link' value in the PIRQ table is already in the correct format
		394	* for the Index register. There are some special index values:
		395	* 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
		396	* and 0x03 for SMBus.
		397	*/
		398	static int pirq_serverworks_get(struct pci_dev router, struct pci_dev dev, int pirq)
		399	{
		400	outb_p(pirq, 0xc00);
		401	return inb(0xc01) & 0xf;
		402	}
		403
		404	static int pirq_serverworks_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		405	{
		406	outb_p(pirq, 0xc00);
		407	outb_p(irq, 0xc01);
		408	return 1;
		409	}
		410
		411	/* Support for AMD756 PCI IRQ Routing
		412	* Jhon H. Caicedo <jhcaiced@osso.org.co>
		413	* Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
		414	* Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
		415	* The AMD756 pirq rules are nibble-based
		416	* offset 0x56 0-3 PIRQA 4-7 PIRQB
		417	* offset 0x57 0-3 PIRQC 4-7 PIRQD
		418	*/
		419	static int pirq_amd756_get(struct pci_dev router, struct pci_dev dev, int pirq)
		420	{
		421	u8 irq;
		422	irq = 0;
		423	if (pirq <= 4)
		424	{
		425	irq = read_config_nybble(router, 0x56, pirq - 1);
		426	}
		427	printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\n",
		428	dev->vendor, dev->device, pirq, irq);
		429	return irq;
		430	}
		431
		432	static int pirq_amd756_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		433	{
		434	printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n",
		435	dev->vendor, dev->device, pirq, irq);
		436	if (pirq <= 4)
		437	{
		438	write_config_nybble(router, 0x56, pirq - 1, irq);
		439	}
		440	return 1;
		441	}
		442
		443	#ifdef CONFIG_PCI_BIOS
		444
		445	static int pirq_bios_set(struct pci_dev router, struct pci_dev dev, int pirq, int irq)
		446	{
		447	struct pci_dev *bridge;
		448	int pin = pci_get_interrupt_pin(dev, &bridge);
		449	return pcibios_set_irq_routing(bridge, pin, irq);
		450	}
		451
		452	#endif
		453
		454
		455	static __init int intel_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		456	{
		457	#if 0 /* Let's see what chip this is supposed to be ... */
		458	/* We must not touch 440GX even if we have tables. 440GX has
		459	different IRQ routing weirdness */
		460	if (pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82440GX, NULL))
		461	return 0;
		462	#endif
		463
		464	switch(device)
		465	{
		466	case PCI_DEVICE_ID_INTEL_82371FB_0:
		467	case PCI_DEVICE_ID_INTEL_82371SB_0:
		468	case PCI_DEVICE_ID_INTEL_82371AB_0:
		469	case PCI_DEVICE_ID_INTEL_82371MX:
		470	case PCI_DEVICE_ID_INTEL_82443MX_0:
		471	case PCI_DEVICE_ID_INTEL_82801AA_0:
		472	case PCI_DEVICE_ID_INTEL_82801AB_0:
		473	case PCI_DEVICE_ID_INTEL_82801BA_0:
		474	case PCI_DEVICE_ID_INTEL_82801BA_10:
		475	case PCI_DEVICE_ID_INTEL_82801CA_0:
		476	case PCI_DEVICE_ID_INTEL_82801CA_12:
		477	case PCI_DEVICE_ID_INTEL_82801DB_0:
		478	case PCI_DEVICE_ID_INTEL_82801E_0:
		479	case PCI_DEVICE_ID_INTEL_82801EB_0:
		480	case PCI_DEVICE_ID_INTEL_ESB_0:
		481	r->name = "PIIX/ICH";
		482	r->get = pirq_piix_get;
		483	r->set = pirq_piix_set;
		484	return 1;
		485	}
		486	return 0;
		487	}
		488
		489	static __init int via_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		490	{
		491	/* FIXME: We should move some of the quirk fixup stuff here */
		492	switch(device)
		493	{
		494	case PCI_DEVICE_ID_VIA_82C586_0:
		495	case PCI_DEVICE_ID_VIA_82C596:
		496	case PCI_DEVICE_ID_VIA_82C686:
		497	case PCI_DEVICE_ID_VIA_8231:
		498	/* FIXME: add new ones for 8233/5 */
		499	r->name = "VIA";
		500	r->get = pirq_via_get;
		501	r->set = pirq_via_set;
		502	return 1;
		503	}
		504	return 0;
		505	}
		506
		507	static __init int vlsi_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		508	{
		509	switch(device)
		510	{
		511	case PCI_DEVICE_ID_VLSI_82C534:
		512	r->name = "VLSI 82C534";
		513	r->get = pirq_vlsi_get;
		514	r->set = pirq_vlsi_set;
		515	return 1;
		516	}
		517	return 0;
		518	}
		519
		520
		521	static __init int serverworks_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		522	{
		523	switch(device)
		524	{
		525	case PCI_DEVICE_ID_SERVERWORKS_OSB4:
		526	case PCI_DEVICE_ID_SERVERWORKS_CSB5:
		527	r->name = "ServerWorks";
		528	r->get = pirq_serverworks_get;
		529	r->set = pirq_serverworks_set;
		530	return 1;
		531	}
		532	return 0;
		533	}
		534
		535	static __init int sis_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		536	{
		537	if (device != PCI_DEVICE_ID_SI_503)
		538	return 0;
		539
		540	r->name = "SIS";
		541	r->get = pirq_sis_get;
		542	r->set = pirq_sis_set;
		543	return 1;
		544	}
		545
		546	static __init int cyrix_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		547	{
		548	switch(device)
		549	{
		550	case PCI_DEVICE_ID_CYRIX_5520:
		551	r->name = "NatSemi";
		552	r->get = pirq_cyrix_get;
		553	r->set = pirq_cyrix_set;
		554	return 1;
		555	}
		556	return 0;
		557	}
		558
		559	static __init int opti_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		560	{
		561	switch(device)
		562	{
		563	case PCI_DEVICE_ID_OPTI_82C700:
		564	r->name = "OPTI";
		565	r->get = pirq_opti_get;
		566	r->set = pirq_opti_set;
		567	return 1;
		568	}
		569	return 0;
		570	}
		571
		572	static __init int ite_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		573	{
		574	switch(device)
		575	{
		576	case PCI_DEVICE_ID_ITE_IT8330G_0:
		577	r->name = "ITE";
		578	r->get = pirq_ite_get;
		579	r->set = pirq_ite_set;
		580	return 1;
		581	}
		582	return 0;
		583	}
		584
		585	static __init int ali_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		586	{
		587	switch(device)
		588	{
		589	case PCI_DEVICE_ID_AL_M1533:
		590	r->name = "ALI";
		591	r->get = pirq_ali_get;
		592	r->set = pirq_ali_set;
		593	return 1;
		594	/* Should add 156x some day */
		595	}
		596	return 0;
		597	}
		598
		599	static __init int amd_router_probe(struct irq_router r, struct pci_dev router, u16 device)
		600	{
		601	switch(device)
		602	{
		603	case PCI_DEVICE_ID_AMD_VIPER_740B:
		604	r->name = "AMD756";
		605	break;
		606	case PCI_DEVICE_ID_AMD_VIPER_7413:
		607	r->name = "AMD766";
		608	break;
		609	case PCI_DEVICE_ID_AMD_VIPER_7443:
		610	r->name = "AMD768";
		611	break;
		612	default:
		613	return 0;
		614	}
		615	r->get = pirq_amd756_get;
		616	r->set = pirq_amd756_set;
		617	return 1;
		618	}
		619
		620	static __initdata struct irq_router_handler pirq_routers[] = {
		621	{ PCI_VENDOR_ID_INTEL, intel_router_probe },
		622	{ PCI_VENDOR_ID_AL, ali_router_probe },
		623	{ PCI_VENDOR_ID_ITE, ite_router_probe },
		624	{ PCI_VENDOR_ID_VIA, via_router_probe },
		625	{ PCI_VENDOR_ID_OPTI, opti_router_probe },
		626	{ PCI_VENDOR_ID_SI, sis_router_probe },
		627	{ PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
		628	{ PCI_VENDOR_ID_VLSI, vlsi_router_probe },
		629	{ PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
		630	{ PCI_VENDOR_ID_AMD, amd_router_probe },
		631	/* Someone with docs needs to add the ATI Radeon IGP */
		632	{ 0, NULL }
		633	};
		634	static struct irq_router pirq_router;
		635	static struct pci_dev *pirq_router_dev;
		636
		637
		638	/*
		639	* FIXME: should we have an option to say "generic for
		640	* chipset" ?
		641	*/
		642
		643	static void __init pirq_find_router(struct irq_router *r)
		644	{
		645	struct irq_routing_table *rt = pirq_table;
		646	struct irq_router_handler *h;
		647
		648	#ifdef CONFIG_PCI_BIOS
		649	if (!rt->signature) {
		650	printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
		651	r->set = pirq_bios_set;
		652	r->name = "BIOS";
		653	return;
		654	}
		655	#endif
		656
		657	/* Default unless a driver reloads it */
		658	r->name = "default";
		659	r->get = NULL;
		660	r->set = NULL;
		661
		662	DBG("PCI: Attempting to find IRQ router for %04x:%04x\n",
		663	rt->rtr_vendor, rt->rtr_device);
		664
		665	pirq_router_dev = pci_find_slot(rt->rtr_bus, rt->rtr_devfn);
		666	if (!pirq_router_dev) {
		667	DBG("PCI: Interrupt router not found at %02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
		668	return;
		669	}
		670
		671	for( h = pirq_routers; h->vendor; h++) {
		672	/* First look for a router match */
		673	if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
		674	break;
		675	/* Fall back to a device match */
		676	if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
		677	break;
		678	}
		679	printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
		680	pirq_router.name,
		681	pirq_router_dev->vendor,
		682	pirq_router_dev->device,
		683	pci_name(pirq_router_dev));
		684	}
		685
		686	static struct irq_info pirq_get_info(struct pci_dev dev)
		687	{
		688	struct irq_routing_table *rt = pirq_table;
		689	int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
		690	struct irq_info *info;
		691
		692	for (info = rt->slots; entries--; info++)
		693	if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
		694	return info;
		695	return NULL;
		696	}
		697
		698	static irqreturn_t pcibios_test_irq_handler(int irq, void dev_id, struct pt_regs regs)
		699	{
		700	return IRQ_NONE;
		701	}
		702
		703	static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
		704	{
		705	u8 pin;
		706	struct irq_info *info;
		707	int i, pirq, newirq;
		708	int irq = 0;
		709	u32 mask;
		710	struct irq_router *r = &pirq_router;
		711	struct pci_dev *dev2 = NULL;
		712	char *msg = NULL;
		713
		714	/* Find IRQ pin */
		715	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
		716	if (!pin) {
		717	DBG(" -> no interrupt pin\n");
		718	return 0;
		719	}
		720	pin = pin - 1;
		721
		722	/* Find IRQ routing entry */
		723
		724	if (!pirq_table)
		725	return 0;
		726
		727	DBG("IRQ for %s:%d", pci_name(dev), pin);
		728	info = pirq_get_info(dev);
		729	if (!info) {
		730	DBG(" -> not found in routing table\n");
		731	return 0;
		732	}
		733	pirq = info->irq[pin].link;
		734	mask = info->irq[pin].bitmap;
		735	if (!pirq) {
		736	DBG(" -> not routed\n");
		737	return 0;
		738	}
		739	DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
		740	mask &= pcibios_irq_mask;
		741
		742	/* Work around broken HP Pavilion Notebooks which assign USB to
		743	IRQ 9 even though it is actually wired to IRQ 11 */
		744
		745	if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
		746	dev->irq = 11;
		747	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
		748	r->set(pirq_router_dev, dev, pirq, 11);
		749	}
		750
		751	/*
		752	* Find the best IRQ to assign: use the one
		753	* reported by the device if possible.
		754	*/
		755	newirq = dev->irq;
		756	if (!((1 << newirq) & mask)) {
		757	if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
		758	else printk(KERN_WARNING "PCI: IRQ %i for device %s doesn't match PIRQ mask - try pci=usepirqmask\n", newirq, pci_name(dev));
		759	}
		760	if (!newirq && assign) {
		761	for (i = 0; i < 16; i++) {
		762	if (!(mask & (1 << i)))
		763	continue;
		764	if (pirq_penalty[i] < pirq_penalty[newirq] &&
		765	!request_irq(i, pcibios_test_irq_handler, SA_SHIRQ, "pci-test", dev)) {
		766	free_irq(i, dev);
		767	newirq = i;
		768	}
		769	}
		770	}
		771	DBG(" -> newirq=%d", newirq);
		772
		773	/* Check if it is hardcoded */
		774	if ((pirq & 0xf0) == 0xf0) {
		775	irq = pirq & 0xf;
		776	DBG(" -> hardcoded IRQ %d\n", irq);
		777	msg = "Hardcoded";
		778	} else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
		779	((!(pci_probe & PCI_USE_PIRQ_MASK)) \|\| ((1 << irq) & mask)) ) {
		780	DBG(" -> got IRQ %d\n", irq);
		781	msg = "Found";
		782	} else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
		783	DBG(" -> assigning IRQ %d", newirq);
		784	if (r->set(pirq_router_dev, dev, pirq, newirq)) {
		785	eisa_set_level_irq(newirq);
		786	DBG(" ... OK\n");
		787	msg = "Assigned";
		788	irq = newirq;
		789	}
		790	}
		791
		792	if (!irq) {
		793	DBG(" ... failed\n");
		794	if (newirq && mask == (1 << newirq)) {
		795	msg = "Guessed";
		796	irq = newirq;
		797	} else
		798	return 0;
		799	}
		800	printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
		801
		802	/* Update IRQ for all devices with the same pirq value */
		803	while ((dev2 = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
		804	pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
		805	if (!pin)
		806	continue;
		807	pin--;
		808	info = pirq_get_info(dev2);
		809	if (!info)
		810	continue;
		811	if (info->irq[pin].link == pirq) {
		812	/* We refuse to override the dev->irq information. Give a warning! */
		813	if ( dev2->irq && dev2->irq != irq && \
		814	(!(pci_probe & PCI_USE_PIRQ_MASK) \|\| \
		815	((1 << dev2->irq) & mask)) ) {
		816	printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
		817	pci_name(dev2), dev2->irq, irq);
		818	continue;
		819	}
		820	dev2->irq = irq;
		821	pirq_penalty[irq]++;
		822	if (dev != dev2)
		823	printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
		824	}
		825	}
		826	return 1;
		827	}
		828
		829	static void __init pcibios_fixup_irqs(void)
		830	{
		831	struct pci_dev *dev = NULL;
		832	u8 pin;
		833
		834	DBG("PCI: IRQ fixup\n");
		835	while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		836	/*
		837	* If the BIOS has set an out of range IRQ number, just ignore it.
		838	* Also keep track of which IRQ's are already in use.
		839	*/
		840	if (dev->irq >= 16) {
		841	DBG("%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
		842	dev->irq = 0;
		843	}
		844	/* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
		845	if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
		846	pirq_penalty[dev->irq] = 0;
		847	pirq_penalty[dev->irq]++;
		848	}
		849
		850	dev = NULL;
		851	while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		852	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
		853	#ifdef CONFIG_X86_IO_APIC
		854	/*
		855	* Recalculate IRQ numbers if we use the I/O APIC.
		856	*/
		857	if (io_apic_assign_pci_irqs)
		858	{
		859	int irq;
		860
		861	if (pin) {
		862	pin--; /* interrupt pins are numbered starting from 1 */
		863	irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
		864	/*
		865	* Busses behind bridges are typically not listed in the MP-table.
		866	* In this case we have to look up the IRQ based on the parent bus,
		867	* parent slot, and pin number. The SMP code detects such bridged
		868	* busses itself so we should get into this branch reliably.
		869	*/
		870	if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
		871	struct pci_dev * bridge = dev->bus->self;
		872
		873	pin = (pin + PCI_SLOT(dev->devfn)) % 4;
		874	irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
		875	PCI_SLOT(bridge->devfn), pin);
		876	if (irq >= 0)
		877	printk(KERN_WARNING "PCI: using PPB(B%d,I%d,P%d) to get irq %d\n",
		878	bridge->bus->number, PCI_SLOT(bridge->devfn), pin, irq);
		879	}
		880	if (irq >= 0) {
		881	printk(KERN_INFO "PCI->APIC IRQ transform: (B%d,I%d,P%d) -> %d\n",
		882	dev->bus->number, PCI_SLOT(dev->devfn), pin, irq);
		883	dev->irq = irq;
		884	}
		885	}
		886	}
		887	#endif
		888	/*
		889	* Still no IRQ? Try to lookup one...
		890	*/
		891	if (pin && !dev->irq)
		892	pcibios_lookup_irq(dev, 0);
		893	}
		894	}
		895
		896	int __init pcibios_irq_init(void)
		897	{
		898	DBG("PCI: IRQ init\n");
		899
		900	if (pcibios_enable_irq)
		901	return 0;
		902
		903	pirq_table = pirq_find_routing_table();
		904
		905	#ifdef CONFIG_PCI_BIOS
		906	if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
		907	pirq_table = pcibios_get_irq_routing_table();
		908	#endif
		909	if (pirq_table) {
		910	pirq_peer_trick();
		911	pirq_find_router(&pirq_router);
		912	if (pirq_table->exclusive_irqs) {
		913	int i;
		914	for (i=0; i<16; i++)
		915	if (!(pirq_table->exclusive_irqs & (1 << i)))
		916	pirq_penalty[i] += 100;
		917	}
		918	/* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
		919	if (io_apic_assign_pci_irqs)
		920	pirq_table = NULL;
		921	}
		922
		923	pcibios_enable_irq = pirq_enable_irq;
		924
		925	pcibios_fixup_irqs();
		926	return 0;
		927	}
		928
		929	subsys_initcall(pcibios_irq_init);
		930
		931
		932	void pcibios_penalize_isa_irq(int irq)
		933	{
		934	/*
		935	* If any ISAPnP device reports an IRQ in its list of possible
		936	* IRQ's, we try to avoid assigning it to PCI devices.
		937	*/
		938	pirq_penalty[irq] += 100;
		939	}
		940
		941	int pirq_enable_irq(struct pci_dev *dev)
		942	{
		943	u8 pin;
		944	extern int interrupt_line_quirk;
		945	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
		946	if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
		947	char *msg;
		948	if (io_apic_assign_pci_irqs)
		949	msg = " Probably buggy MP table.";
		950	else if (pci_probe & PCI_BIOS_IRQ_SCAN)
		951	msg = "";
		952	else
		953	msg = " Please try using pci=biosirq.";
		954
		955	/* With IDE legacy devices the IRQ lookup failure is not a problem.. */
		956	if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
		957	return 0;
		958
		959	printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
		960	'A' + pin - 1, pci_name(dev), msg);
		961	}
		962	/* VIA bridges use interrupt line for apic/pci steering across
		963	the V-Link */
		964	else if (interrupt_line_quirk)
		965	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
		966	return 0;
		967	}

Subversion Repositories shark

(root)/shark/branches/xen/drivers/pci/irq.c - Rev 1618