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Linux-2.6.12-rc2
[deliverable/linux.git] / arch / i386 / pci / irq.c
CommitLineData
1da177e4
LT		 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 <linux/config.h>
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/pci.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/interrupt.h>
14#include <linux/irq.h>
15#include <linux/dmi.h>
16#include <asm/io.h>
17#include <asm/smp.h>
18#include <asm/io_apic.h>
19#include <asm/hw_irq.h>
20#include <linux/acpi.h>
21
22#include "pci.h"
23
24#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
25#define PIRQ_VERSION 0x0100
26
27static int broken_hp_bios_irq9;
28static int acer_tm360_irqrouting;
29
30static struct irq_routing_table *pirq_table;
31
32static int pirq_enable_irq(struct pci_dev *dev);
33
34/*
35 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
36 * Avoid using: 13, 14 and 15 (FP error and IDE).
37 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
38 */
39unsigned int pcibios_irq_mask = 0xfff8;
40
41static int pirq_penalty[16] = {
42 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
43 0, 0, 0, 0, 1000, 100000, 100000, 100000
44};
45
46struct irq_router {
47 char *name;
48 u16 vendor, device;
49 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
50 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
51};
52
53struct irq_router_handler {
54 u16 vendor;
55 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
56};
57
58int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
59
60/*
61 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
62 */
63
64static struct irq_routing_table * __init pirq_find_routing_table(void)
65{
66 u8 *addr;
67 struct irq_routing_table *rt;
68 int i;
69 u8 sum;
70
71 for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
72 rt = (struct irq_routing_table *) addr;
73 if (rt->signature != PIRQ_SIGNATURE ||
74 rt->version != PIRQ_VERSION ||
75 rt->size % 16 ||
76 rt->size < sizeof(struct irq_routing_table))
77 continue;
78 sum = 0;
79 for(i=0; i<rt->size; i++)
80 sum += addr[i];
81 if (!sum) {
82 DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
83 return rt;
84 }
85 }
86 return NULL;
87}
88
89/*
90 * If we have a IRQ routing table, use it to search for peer host
91 * bridges. It's a gross hack, but since there are no other known
92 * ways how to get a list of buses, we have to go this way.
93 */
94
95static void __init pirq_peer_trick(void)
96{
97 struct irq_routing_table *rt = pirq_table;
98 u8 busmap[256];
99 int i;
100 struct irq_info *e;
101
102 memset(busmap, 0, sizeof(busmap));
103 for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
104 e = &rt->slots[i];
105#ifdef DEBUG
106 {
107 int j;
108 DBG("%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
109 for(j=0; j<4; j++)
110 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
111 DBG("\n");
112 }
113#endif
114 busmap[e->bus] = 1;
115 }
116 for(i = 1; i < 256; i++) {
117 if (!busmap[i] || pci_find_bus(0, i))
118 continue;
119 if (pci_scan_bus(i, &pci_root_ops, NULL))
120 printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
121 }
122 pcibios_last_bus = -1;
123}
124
125/*
126 * Code for querying and setting of IRQ routes on various interrupt routers.
127 */
128
129void eisa_set_level_irq(unsigned int irq)
130{
131 unsigned char mask = 1 << (irq & 7);
132 unsigned int port = 0x4d0 + (irq >> 3);
133 unsigned char val;
134 static u16 eisa_irq_mask;
135
136 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
137 return;
138
139 eisa_irq_mask |= (1 << irq);
140 printk("PCI: setting IRQ %u as level-triggered\n", irq);
141 val = inb(port);
142 if (!(val & mask)) {
143 DBG(" -> edge");
144 outb(val | mask, port);
145 }
146}
147
148/*
149 * Common IRQ routing practice: nybbles in config space,
150 * offset by some magic constant.
151 */
152static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
153{
154 u8 x;
155 unsigned reg = offset + (nr >> 1);
156
157 pci_read_config_byte(router, reg, &x);
158 return (nr & 1) ? (x >> 4) : (x & 0xf);
159}
160
161static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
162{
163 u8 x;
164 unsigned reg = offset + (nr >> 1);
165
166 pci_read_config_byte(router, reg, &x);
167 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
168 pci_write_config_byte(router, reg, x);
169}
170
171/*
172 * ALI pirq entries are damn ugly, and completely undocumented.
173 * This has been figured out from pirq tables, and it's not a pretty
174 * picture.
175 */
176static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
177{
178 static unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
179
180 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
181}
182
183static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
184{
185 static unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
186 unsigned int val = irqmap[irq];
187
188 if (val) {
189 write_config_nybble(router, 0x48, pirq-1, val);
190 return 1;
191 }
192 return 0;
193}
194
195/*
196 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
197 * just a pointer to the config space.
198 */
199static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
200{
201 u8 x;
202
203 pci_read_config_byte(router, pirq, &x);
204 return (x < 16) ? x : 0;
205}
206
207static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
208{
209 pci_write_config_byte(router, pirq, irq);
210 return 1;
211}
212
213/*
214 * The VIA pirq rules are nibble-based, like ALI,
215 * but without the ugly irq number munging.
216 * However, PIRQD is in the upper instead of lower 4 bits.
217 */
218static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
219{
220 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
221}
222
223static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
224{
225 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
226 return 1;
227}
228
229/*
230 * ITE 8330G pirq rules are nibble-based
231 * FIXME: pirqmap may be { 1, 0, 3, 2 },
232 * 2+3 are both mapped to irq 9 on my system
233 */
234static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
235{
236 static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
237 return read_config_nybble(router,0x43, pirqmap[pirq-1]);
238}
239
240static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
241{
242 static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
243 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
244 return 1;
245}
246
247/*
248 * OPTI: high four bits are nibble pointer..
249 * I wonder what the low bits do?
250 */
251static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
252{
253 return read_config_nybble(router, 0xb8, pirq >> 4);
254}
255
256static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
257{
258 write_config_nybble(router, 0xb8, pirq >> 4, irq);
259 return 1;
260}
261
262/*
263 * Cyrix: nibble offset 0x5C
264 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
265 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
266 */
267static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
268{
269 return read_config_nybble(router, 0x5C, (pirq-1)^1);
270}
271
272static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
273{
274 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
275 return 1;
276}
277
278/*
279 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
280 * We have to deal with the following issues here:
281 * - vendors have different ideas about the meaning of link values
282 * - some onboard devices (integrated in the chipset) have special
283 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
284 * - different revision of the router have a different layout for
285 * the routing registers, particularly for the onchip devices
286 *
287 * For all routing registers the common thing is we have one byte
288 * per routeable link which is defined as:
289 * bit 7 IRQ mapping enabled (0) or disabled (1)
290 * bits [6:4] reserved (sometimes used for onchip devices)
291 * bits [3:0] IRQ to map to
292 * allowed: 3-7, 9-12, 14-15
293 * reserved: 0, 1, 2, 8, 13
294 *
295 * The config-space registers located at 0x41/0x42/0x43/0x44 are
296 * always used to route the normal PCI INT A/B/C/D respectively.
297 * Apparently there are systems implementing PCI routing table using
298 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
299 * We try our best to handle both link mappings.
300 *
301 * Currently (2003-05-21) it appears most SiS chipsets follow the
302 * definition of routing registers from the SiS-5595 southbridge.
303 * According to the SiS 5595 datasheets the revision id's of the
304 * router (ISA-bridge) should be 0x01 or 0xb0.
305 *
306 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
307 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
308 * They seem to work with the current routing code. However there is
309 * some concern because of the two USB-OHCI HCs (original SiS 5595
310 * had only one). YMMV.
311 *
312 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
313 *
314 * 0x61: IDEIRQ:
315 * bits [6:5] must be written 01
316 * bit 4 channel-select primary (0), secondary (1)
317 *
318 * 0x62: USBIRQ:
319 * bit 6 OHCI function disabled (0), enabled (1)
320 *
321 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
322 *
323 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
324 *
325 * We support USBIRQ (in addition to INTA-INTD) and keep the
326 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
327 *
328 * Currently the only reported exception is the new SiS 65x chipset
329 * which includes the SiS 69x southbridge. Here we have the 85C503
330 * router revision 0x04 and there are changes in the register layout
331 * mostly related to the different USB HCs with USB 2.0 support.
332 *
333 * Onchip routing for router rev-id 0x04 (try-and-error observation)
334 *
335 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
336 * bit 6-4 are probably unused, not like 5595
337 */
338
339#define PIRQ_SIS_IRQ_MASK 0x0f
340#define PIRQ_SIS_IRQ_DISABLE 0x80
341#define PIRQ_SIS_USB_ENABLE 0x40
342
343static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
344{
345 u8 x;
346 int reg;
347
348 reg = pirq;
349 if (reg >= 0x01 && reg <= 0x04)
350 reg += 0x40;
351 pci_read_config_byte(router, reg, &x);
352 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
353}
354
355static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
356{
357 u8 x;
358 int reg;
359
360 reg = pirq;
361 if (reg >= 0x01 && reg <= 0x04)
362 reg += 0x40;
363 pci_read_config_byte(router, reg, &x);
364 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
365 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
366 pci_write_config_byte(router, reg, x);
367 return 1;
368}
369
370
371/*
372 * VLSI: nibble offset 0x74 - educated guess due to routing table and
373 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
374 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
375 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
376 * for the busbridge to the docking station.
377 */
378
379static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
380{
381 if (pirq > 8) {
382 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
383 return 0;
384 }
385 return read_config_nybble(router, 0x74, pirq-1);
386}
387
388static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
389{
390 if (pirq > 8) {
391 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
392 return 0;
393 }
394 write_config_nybble(router, 0x74, pirq-1, irq);
395 return 1;
396}
397
398/*
399 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
400 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
401 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
402 * register is a straight binary coding of desired PIC IRQ (low nibble).
403 *
404 * The 'link' value in the PIRQ table is already in the correct format
405 * for the Index register. There are some special index values:
406 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
407 * and 0x03 for SMBus.
408 */
409static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
410{
411 outb_p(pirq, 0xc00);
412 return inb(0xc01) & 0xf;
413}
414
415static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
416{
417 outb_p(pirq, 0xc00);
418 outb_p(irq, 0xc01);
419 return 1;
420}
421
422/* Support for AMD756 PCI IRQ Routing
423 * Jhon H. Caicedo <jhcaiced@osso.org.co>
424 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
425 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
426 * The AMD756 pirq rules are nibble-based
427 * offset 0x56 0-3 PIRQA 4-7 PIRQB
428 * offset 0x57 0-3 PIRQC 4-7 PIRQD
429 */
430static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
431{
432 u8 irq;
433 irq = 0;
434 if (pirq <= 4)
435 {
436 irq = read_config_nybble(router, 0x56, pirq - 1);
437 }
438 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\n",
439 dev->vendor, dev->device, pirq, irq);
440 return irq;
441}
442
443static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
444{
445 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n",
446 dev->vendor, dev->device, pirq, irq);
447 if (pirq <= 4)
448 {
449 write_config_nybble(router, 0x56, pirq - 1, irq);
450 }
451 return 1;
452}
453
454#ifdef CONFIG_PCI_BIOS
455
456static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
457{
458 struct pci_dev *bridge;
459 int pin = pci_get_interrupt_pin(dev, &bridge);
460 return pcibios_set_irq_routing(bridge, pin, irq);
461}
462
463#endif
464
465static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
466{
467 static struct pci_device_id pirq_440gx[] = {
468 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
469 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
470 { },
471 };
472
473 /* 440GX has a proprietary PIRQ router -- don't use it */
474 if (pci_dev_present(pirq_440gx))
475 return 0;
476
477 switch(device)
478 {
479 case PCI_DEVICE_ID_INTEL_82371FB_0:
480 case PCI_DEVICE_ID_INTEL_82371SB_0:
481 case PCI_DEVICE_ID_INTEL_82371AB_0:
482 case PCI_DEVICE_ID_INTEL_82371MX:
483 case PCI_DEVICE_ID_INTEL_82443MX_0:
484 case PCI_DEVICE_ID_INTEL_82801AA_0:
485 case PCI_DEVICE_ID_INTEL_82801AB_0:
486 case PCI_DEVICE_ID_INTEL_82801BA_0:
487 case PCI_DEVICE_ID_INTEL_82801BA_10:
488 case PCI_DEVICE_ID_INTEL_82801CA_0:
489 case PCI_DEVICE_ID_INTEL_82801CA_12:
490 case PCI_DEVICE_ID_INTEL_82801DB_0:
491 case PCI_DEVICE_ID_INTEL_82801E_0:
492 case PCI_DEVICE_ID_INTEL_82801EB_0:
493 case PCI_DEVICE_ID_INTEL_ESB_1:
494 case PCI_DEVICE_ID_INTEL_ICH6_0:
495 case PCI_DEVICE_ID_INTEL_ICH6_1:
496 case PCI_DEVICE_ID_INTEL_ICH7_0:
497 case PCI_DEVICE_ID_INTEL_ICH7_1:
498 r->name = "PIIX/ICH";
499 r->get = pirq_piix_get;
500 r->set = pirq_piix_set;
501 return 1;
502 }
503 return 0;
504}
505
506static __init int via_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
507{
508 /* FIXME: We should move some of the quirk fixup stuff here */
509 switch(device)
510 {
511 case PCI_DEVICE_ID_VIA_82C586_0:
512 case PCI_DEVICE_ID_VIA_82C596:
513 case PCI_DEVICE_ID_VIA_82C686:
514 case PCI_DEVICE_ID_VIA_8231:
515 /* FIXME: add new ones for 8233/5 */
516 r->name = "VIA";
517 r->get = pirq_via_get;
518 r->set = pirq_via_set;
519 return 1;
520 }
521 return 0;
522}
523
524static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
525{
526 switch(device)
527 {
528 case PCI_DEVICE_ID_VLSI_82C534:
529 r->name = "VLSI 82C534";
530 r->get = pirq_vlsi_get;
531 r->set = pirq_vlsi_set;
532 return 1;
533 }
534 return 0;
535}
536
537
538static __init int serverworks_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
539{
540 switch(device)
541 {
542 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
543 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
544 r->name = "ServerWorks";
545 r->get = pirq_serverworks_get;
546 r->set = pirq_serverworks_set;
547 return 1;
548 }
549 return 0;
550}
551
552static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
553{
554 if (device != PCI_DEVICE_ID_SI_503)
555 return 0;
556
557 r->name = "SIS";
558 r->get = pirq_sis_get;
559 r->set = pirq_sis_set;
560 return 1;
561}
562
563static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
564{
565 switch(device)
566 {
567 case PCI_DEVICE_ID_CYRIX_5520:
568 r->name = "NatSemi";
569 r->get = pirq_cyrix_get;
570 r->set = pirq_cyrix_set;
571 return 1;
572 }
573 return 0;
574}
575
576static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
577{
578 switch(device)
579 {
580 case PCI_DEVICE_ID_OPTI_82C700:
581 r->name = "OPTI";
582 r->get = pirq_opti_get;
583 r->set = pirq_opti_set;
584 return 1;
585 }
586 return 0;
587}
588
589static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
590{
591 switch(device)
592 {
593 case PCI_DEVICE_ID_ITE_IT8330G_0:
594 r->name = "ITE";
595 r->get = pirq_ite_get;
596 r->set = pirq_ite_set;
597 return 1;
598 }
599 return 0;
600}
601
602static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
603{
604 switch(device)
605 {
606 case PCI_DEVICE_ID_AL_M1533:
607 case PCI_DEVICE_ID_AL_M1563:
608 printk("PCI: Using ALI IRQ Router\n");
609 r->name = "ALI";
610 r->get = pirq_ali_get;
611 r->set = pirq_ali_set;
612 return 1;
613 }
614 return 0;
615}
616
617static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
618{
619 switch(device)
620 {
621 case PCI_DEVICE_ID_AMD_VIPER_740B:
622 r->name = "AMD756";
623 break;
624 case PCI_DEVICE_ID_AMD_VIPER_7413:
625 r->name = "AMD766";
626 break;
627 case PCI_DEVICE_ID_AMD_VIPER_7443:
628 r->name = "AMD768";
629 break;
630 default:
631 return 0;
632 }
633 r->get = pirq_amd756_get;
634 r->set = pirq_amd756_set;
635 return 1;
636}
637
638static __initdata struct irq_router_handler pirq_routers[] = {
639 { PCI_VENDOR_ID_INTEL, intel_router_probe },
640 { PCI_VENDOR_ID_AL, ali_router_probe },
641 { PCI_VENDOR_ID_ITE, ite_router_probe },
642 { PCI_VENDOR_ID_VIA, via_router_probe },
643 { PCI_VENDOR_ID_OPTI, opti_router_probe },
644 { PCI_VENDOR_ID_SI, sis_router_probe },
645 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
646 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
647 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
648 { PCI_VENDOR_ID_AMD, amd_router_probe },
649 /* Someone with docs needs to add the ATI Radeon IGP */
650 { 0, NULL }
651};
652static struct irq_router pirq_router;
653static struct pci_dev *pirq_router_dev;
654
655
656/*
657 * FIXME: should we have an option to say "generic for
658 * chipset" ?
659 */
660
661static void __init pirq_find_router(struct irq_router *r)
662{
663 struct irq_routing_table *rt = pirq_table;
664 struct irq_router_handler *h;
665
666#ifdef CONFIG_PCI_BIOS
667 if (!rt->signature) {
668 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
669 r->set = pirq_bios_set;
670 r->name = "BIOS";
671 return;
672 }
673#endif
674
675 /* Default unless a driver reloads it */
676 r->name = "default";
677 r->get = NULL;
678 r->set = NULL;
679
680 DBG("PCI: Attempting to find IRQ router for %04x:%04x\n",
681 rt->rtr_vendor, rt->rtr_device);
682
683 pirq_router_dev = pci_find_slot(rt->rtr_bus, rt->rtr_devfn);
684 if (!pirq_router_dev) {
685 DBG("PCI: Interrupt router not found at %02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
686 return;
687 }
688
689 for( h = pirq_routers; h->vendor; h++) {
690 /* First look for a router match */
691 if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
692 break;
693 /* Fall back to a device match */
694 if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
695 break;
696 }
697 printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
698 pirq_router.name,
699 pirq_router_dev->vendor,
700 pirq_router_dev->device,
701 pci_name(pirq_router_dev));
702}
703
704static struct irq_info *pirq_get_info(struct pci_dev *dev)
705{
706 struct irq_routing_table *rt = pirq_table;
707 int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
708 struct irq_info *info;
709
710 for (info = rt->slots; entries--; info++)
711 if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
712 return info;
713 return NULL;
714}
715
716static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
717{
718 u8 pin;
719 struct irq_info *info;
720 int i, pirq, newirq;
721 int irq = 0;
722 u32 mask;
723 struct irq_router *r = &pirq_router;
724 struct pci_dev *dev2 = NULL;
725 char *msg = NULL;
726
727 /* Find IRQ pin */
728 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
729 if (!pin) {
730 DBG(" -> no interrupt pin\n");
731 return 0;
732 }
733 pin = pin - 1;
734
735 /* Find IRQ routing entry */
736
737 if (!pirq_table)
738 return 0;
739
740 DBG("IRQ for %s[%c]", pci_name(dev), 'A' + pin);
741 info = pirq_get_info(dev);
742 if (!info) {
743 DBG(" -> not found in routing table\n");
744 return 0;
745 }
746 pirq = info->irq[pin].link;
747 mask = info->irq[pin].bitmap;
748 if (!pirq) {
749 DBG(" -> not routed\n");
750 return 0;
751 }
752 DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
753 mask &= pcibios_irq_mask;
754
755 /* Work around broken HP Pavilion Notebooks which assign USB to
756 IRQ 9 even though it is actually wired to IRQ 11 */
757
758 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
759 dev->irq = 11;
760 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
761 r->set(pirq_router_dev, dev, pirq, 11);
762 }
763
764 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
765 if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
766 pirq = 0x68;
767 mask = 0x400;
768 dev->irq = r->get(pirq_router_dev, dev, pirq);
769 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
770 }
771
772 /*
773 * Find the best IRQ to assign: use the one
774 * reported by the device if possible.
775 */
776 newirq = dev->irq;
777 if (!((1 << newirq) & mask)) {
778 if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
779 else printk(KERN_WARNING "PCI: IRQ %i for device %s doesn't match PIRQ mask - try pci=usepirqmask\n", newirq, pci_name(dev));
780 }
781 if (!newirq && assign) {
782 for (i = 0; i < 16; i++) {
783 if (!(mask & (1 << i)))
784 continue;
785 if (pirq_penalty[i] < pirq_penalty[newirq] && can_request_irq(i, SA_SHIRQ))
786 newirq = i;
787 }
788 }
789 DBG(" -> newirq=%d", newirq);
790
791 /* Check if it is hardcoded */
792 if ((pirq & 0xf0) == 0xf0) {
793 irq = pirq & 0xf;
794 DBG(" -> hardcoded IRQ %d\n", irq);
795 msg = "Hardcoded";
796 } else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
797 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask)) ) {
798 DBG(" -> got IRQ %d\n", irq);
799 msg = "Found";
800 } else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
801 DBG(" -> assigning IRQ %d", newirq);
802 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
803 eisa_set_level_irq(newirq);
804 DBG(" ... OK\n");
805 msg = "Assigned";
806 irq = newirq;
807 }
808 }
809
810 if (!irq) {
811 DBG(" ... failed\n");
812 if (newirq && mask == (1 << newirq)) {
813 msg = "Guessed";
814 irq = newirq;
815 } else
816 return 0;
817 }
818 printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
819
820 /* Update IRQ for all devices with the same pirq value */
821 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
822 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
823 if (!pin)
824 continue;
825 pin--;
826 info = pirq_get_info(dev2);
827 if (!info)
828 continue;
829 if (info->irq[pin].link == pirq) {
830 /* We refuse to override the dev->irq information. Give a warning! */
831 if ( dev2->irq && dev2->irq != irq && \
832 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
833 ((1 << dev2->irq) & mask)) ) {
834#ifndef CONFIG_PCI_MSI
835 printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
836 pci_name(dev2), dev2->irq, irq);
837#endif
838 continue;
839 }
840 dev2->irq = irq;
841 pirq_penalty[irq]++;
842 if (dev != dev2)
843 printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
844 }
845 }
846 return 1;
847}
848
849static void __init pcibios_fixup_irqs(void)
850{
851 struct pci_dev *dev = NULL;
852 u8 pin;
853
854 DBG("PCI: IRQ fixup\n");
855 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
856 /*
857 * If the BIOS has set an out of range IRQ number, just ignore it.
858 * Also keep track of which IRQ's are already in use.
859 */
860 if (dev->irq >= 16) {
861 DBG("%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
862 dev->irq = 0;
863 }
864 /* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
865 if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
866 pirq_penalty[dev->irq] = 0;
867 pirq_penalty[dev->irq]++;
868 }
869
870 dev = NULL;
871 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
872 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
873#ifdef CONFIG_X86_IO_APIC
874 /*
875 * Recalculate IRQ numbers if we use the I/O APIC.
876 */
877 if (io_apic_assign_pci_irqs)
878 {
879 int irq;
880
881 if (pin) {
882 pin--; /* interrupt pins are numbered starting from 1 */
883 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
884 /*
885 * Busses behind bridges are typically not listed in the MP-table.
886 * In this case we have to look up the IRQ based on the parent bus,
887 * parent slot, and pin number. The SMP code detects such bridged
888 * busses itself so we should get into this branch reliably.
889 */
890 if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
891 struct pci_dev * bridge = dev->bus->self;
892
893 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
894 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
895 PCI_SLOT(bridge->devfn), pin);
896 if (irq >= 0)
897 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
898 pci_name(bridge), 'A' + pin, irq);
899 }
900 if (irq >= 0) {
901 if (use_pci_vector() &&
902 !platform_legacy_irq(irq))
903 irq = IO_APIC_VECTOR(irq);
904
905 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
906 pci_name(dev), 'A' + pin, irq);
907 dev->irq = irq;
908 }
909 }
910 }
911#endif
912 /*
913 * Still no IRQ? Try to lookup one...
914 */
915 if (pin && !dev->irq)
916 pcibios_lookup_irq(dev, 0);
917 }
918}
919
920/*
921 * Work around broken HP Pavilion Notebooks which assign USB to
922 * IRQ 9 even though it is actually wired to IRQ 11
923 */
924static int __init fix_broken_hp_bios_irq9(struct dmi_system_id *d)
925{
926 if (!broken_hp_bios_irq9) {
927 broken_hp_bios_irq9 = 1;
928 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
929 }
930 return 0;
931}
932
933/*
934 * Work around broken Acer TravelMate 360 Notebooks which assign
935 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
936 */
937static int __init fix_acer_tm360_irqrouting(struct dmi_system_id *d)
938{
939 if (!acer_tm360_irqrouting) {
940 acer_tm360_irqrouting = 1;
941 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
942 }
943 return 0;
944}
945
946static struct dmi_system_id __initdata pciirq_dmi_table[] = {
947 {
948 .callback = fix_broken_hp_bios_irq9,
949 .ident = "HP Pavilion N5400 Series Laptop",
950 .matches = {
951 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
952 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
953 DMI_MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
954 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
955 },
956 },
957 {
958 .callback = fix_acer_tm360_irqrouting,
959 .ident = "Acer TravelMate 36x Laptop",
960 .matches = {
961 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
962 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
963 },
964 },
965 { }
966};
967
968static int __init pcibios_irq_init(void)
969{
970 DBG("PCI: IRQ init\n");
971
972 if (pcibios_enable_irq || raw_pci_ops == NULL)
973 return 0;
974
975 dmi_check_system(pciirq_dmi_table);
976
977 pirq_table = pirq_find_routing_table();
978
979#ifdef CONFIG_PCI_BIOS
980 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
981 pirq_table = pcibios_get_irq_routing_table();
982#endif
983 if (pirq_table) {
984 pirq_peer_trick();
985 pirq_find_router(&pirq_router);
986 if (pirq_table->exclusive_irqs) {
987 int i;
988 for (i=0; i<16; i++)
989 if (!(pirq_table->exclusive_irqs & (1 << i)))
990 pirq_penalty[i] += 100;
991 }
992 /* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
993 if (io_apic_assign_pci_irqs)
994 pirq_table = NULL;
995 }
996
997 pcibios_enable_irq = pirq_enable_irq;
998
999 pcibios_fixup_irqs();
1000 return 0;
1001}
1002
1003subsys_initcall(pcibios_irq_init);
1004
1005
1006static void pirq_penalize_isa_irq(int irq)
1007{
1008 /*
1009 * If any ISAPnP device reports an IRQ in its list of possible
1010 * IRQ's, we try to avoid assigning it to PCI devices.
1011 */
1012 if (irq < 16)
1013 pirq_penalty[irq] += 100;
1014}
1015
1016void pcibios_penalize_isa_irq(int irq)
1017{
1018#ifdef CONFIG_ACPI_PCI
1019 if (!acpi_noirq)
1020 acpi_penalize_isa_irq(irq);
1021 else
1022#endif
1023 pirq_penalize_isa_irq(irq);
1024}
1025
1026static int pirq_enable_irq(struct pci_dev *dev)
1027{
1028 u8 pin;
1029 extern int via_interrupt_line_quirk;
1030 struct pci_dev *temp_dev;
1031
1032 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1033 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1034 char *msg = "";
1035
1036 pin--; /* interrupt pins are numbered starting from 1 */
1037
1038 if (io_apic_assign_pci_irqs) {
1039 int irq;
1040
1041 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1042 /*
1043 * Busses behind bridges are typically not listed in the MP-table.
1044 * In this case we have to look up the IRQ based on the parent bus,
1045 * parent slot, and pin number. The SMP code detects such bridged
1046 * busses itself so we should get into this branch reliably.
1047 */
1048 temp_dev = dev;
1049 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1050 struct pci_dev * bridge = dev->bus->self;
1051
1052 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1053 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1054 PCI_SLOT(bridge->devfn), pin);
1055 if (irq >= 0)
1056 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1057 pci_name(bridge), 'A' + pin, irq);
1058 dev = bridge;
1059 }
1060 dev = temp_dev;
1061 if (irq >= 0) {
1062#ifdef CONFIG_PCI_MSI
1063 if (!platform_legacy_irq(irq))
1064 irq = IO_APIC_VECTOR(irq);
1065#endif
1066 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1067 pci_name(dev), 'A' + pin, irq);
1068 dev->irq = irq;
1069 return 0;
1070 } else
1071 msg = " Probably buggy MP table.";
1072 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1073 msg = "";
1074 else
1075 msg = " Please try using pci=biosirq.";
1076
1077 /* With IDE legacy devices the IRQ lookup failure is not a problem.. */
1078 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
1079 return 0;
1080
1081 printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
1082 'A' + pin, pci_name(dev), msg);
1083 }
1084 /* VIA bridges use interrupt line for apic/pci steering across
1085 the V-Link */
1086 else if (via_interrupt_line_quirk)
1087 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq & 15);
1088 return 0;
1089}
1090
1091int pci_vector_resources(int last, int nr_released)
1092{
1093 int count = nr_released;
1094
1095 int next = last;
1096 int offset = (last % 8);
1097
1098 while (next < FIRST_SYSTEM_VECTOR) {
1099 next += 8;
1100#ifdef CONFIG_X86_64
1101 if (next == IA32_SYSCALL_VECTOR)
1102 continue;
1103#else
1104 if (next == SYSCALL_VECTOR)
1105 continue;
1106#endif
1107 count++;
1108 if (next >= FIRST_SYSTEM_VECTOR) {
1109 if (offset%8) {
1110 next = FIRST_DEVICE_VECTOR + offset;
1111 offset++;
1112 continue;
1113 }
1114 count--;
1115 }
1116 }
1117
1118 return count;
1119}
Linux kernel - Deliverables
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