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Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / arch / x86 / pci / irq.c
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/types.h>
8 #include <linux/kernel.h>
9 #include <linux/pci.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/interrupt.h>
13 #include <linux/dmi.h>
14 #include <linux/io.h>
15 #include <linux/smp.h>
16 #include <asm/io_apic.h>
17 #include <linux/irq.h>
18 #include <linux/acpi.h>
19 #include <asm/pci_x86.h>
20
21 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
22 #define PIRQ_VERSION 0x0100
23
24 static int broken_hp_bios_irq9;
25 static int acer_tm360_irqrouting;
26
27 static struct irq_routing_table *pirq_table;
28
29 static int pirq_enable_irq(struct pci_dev *dev);
30
31 /*
32 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
33 * Avoid using: 13, 14 and 15 (FP error and IDE).
34 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
35 */
36 unsigned int pcibios_irq_mask = 0xfff8;
37
38 static int pirq_penalty[16] = {
39 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
40 0, 0, 0, 0, 1000, 100000, 100000, 100000
41 };
42
43 struct irq_router {
44 char *name;
45 u16 vendor, device;
46 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
47 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq,
48 int new);
49 };
50
51 struct irq_router_handler {
52 u16 vendor;
53 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
54 };
55
56 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
57 void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;
58
59 /*
60 * Check passed address for the PCI IRQ Routing Table signature
61 * and perform checksum verification.
62 */
63
64 static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr)
65 {
66 struct irq_routing_table *rt;
67 int i;
68 u8 sum;
69
70 rt = (struct irq_routing_table *) addr;
71 if (rt->signature != PIRQ_SIGNATURE ||
72 rt->version != PIRQ_VERSION ||
73 rt->size % 16 ||
74 rt->size < sizeof(struct irq_routing_table))
75 return NULL;
76 sum = 0;
77 for (i = 0; i < rt->size; i++)
78 sum += addr[i];
79 if (!sum) {
80 DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n",
81 rt);
82 return rt;
83 }
84 return NULL;
85 }
86
87
88
89 /*
90 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
91 */
92
93 static struct irq_routing_table * __init pirq_find_routing_table(void)
94 {
95 u8 *addr;
96 struct irq_routing_table *rt;
97
98 if (pirq_table_addr) {
99 rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
100 if (rt)
101 return rt;
102 printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
103 }
104 for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
105 rt = pirq_check_routing_table(addr);
106 if (rt)
107 return rt;
108 }
109 return NULL;
110 }
111
112 /*
113 * If we have a IRQ routing table, use it to search for peer host
114 * bridges. It's a gross hack, but since there are no other known
115 * ways how to get a list of buses, we have to go this way.
116 */
117
118 static void __init pirq_peer_trick(void)
119 {
120 struct irq_routing_table *rt = pirq_table;
121 u8 busmap[256];
122 int i;
123 struct irq_info *e;
124
125 memset(busmap, 0, sizeof(busmap));
126 for (i = 0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
127 e = &rt->slots[i];
128 #ifdef DEBUG
129 {
130 int j;
131 DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
132 for (j = 0; j < 4; j++)
133 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
134 DBG("\n");
135 }
136 #endif
137 busmap[e->bus] = 1;
138 }
139 for (i = 1; i < 256; i++) {
140 int node;
141 if (!busmap[i] || pci_find_bus(0, i))
142 continue;
143 node = get_mp_bus_to_node(i);
144 if (pci_scan_bus_on_node(i, &pci_root_ops, node))
145 printk(KERN_INFO "PCI: Discovered primary peer "
146 "bus %02x [IRQ]\n", i);
147 }
148 pcibios_last_bus = -1;
149 }
150
151 /*
152 * Code for querying and setting of IRQ routes on various interrupt routers.
153 */
154
155 void eisa_set_level_irq(unsigned int irq)
156 {
157 unsigned char mask = 1 << (irq & 7);
158 unsigned int port = 0x4d0 + (irq >> 3);
159 unsigned char val;
160 static u16 eisa_irq_mask;
161
162 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
163 return;
164
165 eisa_irq_mask |= (1 << irq);
166 printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
167 val = inb(port);
168 if (!(val & mask)) {
169 DBG(KERN_DEBUG " -> edge");
170 outb(val | mask, port);
171 }
172 }
173
174 /*
175 * Common IRQ routing practice: nibbles in config space,
176 * offset by some magic constant.
177 */
178 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
179 {
180 u8 x;
181 unsigned reg = offset + (nr >> 1);
182
183 pci_read_config_byte(router, reg, &x);
184 return (nr & 1) ? (x >> 4) : (x & 0xf);
185 }
186
187 static void write_config_nybble(struct pci_dev *router, unsigned offset,
188 unsigned nr, unsigned int val)
189 {
190 u8 x;
191 unsigned reg = offset + (nr >> 1);
192
193 pci_read_config_byte(router, reg, &x);
194 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
195 pci_write_config_byte(router, reg, x);
196 }
197
198 /*
199 * ALI pirq entries are damn ugly, and completely undocumented.
200 * This has been figured out from pirq tables, and it's not a pretty
201 * picture.
202 */
203 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
204 {
205 static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
206
207 WARN_ON_ONCE(pirq > 16);
208 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
209 }
210
211 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
212 {
213 static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
214 unsigned int val = irqmap[irq];
215
216 WARN_ON_ONCE(pirq > 16);
217 if (val) {
218 write_config_nybble(router, 0x48, pirq-1, val);
219 return 1;
220 }
221 return 0;
222 }
223
224 /*
225 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
226 * just a pointer to the config space.
227 */
228 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
229 {
230 u8 x;
231
232 pci_read_config_byte(router, pirq, &x);
233 return (x < 16) ? x : 0;
234 }
235
236 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
237 {
238 pci_write_config_byte(router, pirq, irq);
239 return 1;
240 }
241
242 /*
243 * The VIA pirq rules are nibble-based, like ALI,
244 * but without the ugly irq number munging.
245 * However, PIRQD is in the upper instead of lower 4 bits.
246 */
247 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
248 {
249 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
250 }
251
252 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
253 {
254 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
255 return 1;
256 }
257
258 /*
259 * The VIA pirq rules are nibble-based, like ALI,
260 * but without the ugly irq number munging.
261 * However, for 82C586, nibble map is different .
262 */
263 static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
264 {
265 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
266
267 WARN_ON_ONCE(pirq > 5);
268 return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
269 }
270
271 static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
272 {
273 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
274
275 WARN_ON_ONCE(pirq > 5);
276 write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
277 return 1;
278 }
279
280 /*
281 * ITE 8330G pirq rules are nibble-based
282 * FIXME: pirqmap may be { 1, 0, 3, 2 },
283 * 2+3 are both mapped to irq 9 on my system
284 */
285 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
286 {
287 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
288
289 WARN_ON_ONCE(pirq > 4);
290 return read_config_nybble(router, 0x43, pirqmap[pirq-1]);
291 }
292
293 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
294 {
295 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
296
297 WARN_ON_ONCE(pirq > 4);
298 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
299 return 1;
300 }
301
302 /*
303 * OPTI: high four bits are nibble pointer..
304 * I wonder what the low bits do?
305 */
306 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
307 {
308 return read_config_nybble(router, 0xb8, pirq >> 4);
309 }
310
311 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
312 {
313 write_config_nybble(router, 0xb8, pirq >> 4, irq);
314 return 1;
315 }
316
317 /*
318 * Cyrix: nibble offset 0x5C
319 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
320 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
321 */
322 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
323 {
324 return read_config_nybble(router, 0x5C, (pirq-1)^1);
325 }
326
327 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
328 {
329 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
330 return 1;
331 }
332
333 /*
334 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
335 * We have to deal with the following issues here:
336 * - vendors have different ideas about the meaning of link values
337 * - some onboard devices (integrated in the chipset) have special
338 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
339 * - different revision of the router have a different layout for
340 * the routing registers, particularly for the onchip devices
341 *
342 * For all routing registers the common thing is we have one byte
343 * per routeable link which is defined as:
344 * bit 7 IRQ mapping enabled (0) or disabled (1)
345 * bits [6:4] reserved (sometimes used for onchip devices)
346 * bits [3:0] IRQ to map to
347 * allowed: 3-7, 9-12, 14-15
348 * reserved: 0, 1, 2, 8, 13
349 *
350 * The config-space registers located at 0x41/0x42/0x43/0x44 are
351 * always used to route the normal PCI INT A/B/C/D respectively.
352 * Apparently there are systems implementing PCI routing table using
353 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
354 * We try our best to handle both link mappings.
355 *
356 * Currently (2003-05-21) it appears most SiS chipsets follow the
357 * definition of routing registers from the SiS-5595 southbridge.
358 * According to the SiS 5595 datasheets the revision id's of the
359 * router (ISA-bridge) should be 0x01 or 0xb0.
360 *
361 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
362 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
363 * They seem to work with the current routing code. However there is
364 * some concern because of the two USB-OHCI HCs (original SiS 5595
365 * had only one). YMMV.
366 *
367 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
368 *
369 * 0x61: IDEIRQ:
370 * bits [6:5] must be written 01
371 * bit 4 channel-select primary (0), secondary (1)
372 *
373 * 0x62: USBIRQ:
374 * bit 6 OHCI function disabled (0), enabled (1)
375 *
376 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
377 *
378 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
379 *
380 * We support USBIRQ (in addition to INTA-INTD) and keep the
381 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
382 *
383 * Currently the only reported exception is the new SiS 65x chipset
384 * which includes the SiS 69x southbridge. Here we have the 85C503
385 * router revision 0x04 and there are changes in the register layout
386 * mostly related to the different USB HCs with USB 2.0 support.
387 *
388 * Onchip routing for router rev-id 0x04 (try-and-error observation)
389 *
390 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
391 * bit 6-4 are probably unused, not like 5595
392 */
393
394 #define PIRQ_SIS_IRQ_MASK 0x0f
395 #define PIRQ_SIS_IRQ_DISABLE 0x80
396 #define PIRQ_SIS_USB_ENABLE 0x40
397
398 static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
399 {
400 u8 x;
401 int reg;
402
403 reg = pirq;
404 if (reg >= 0x01 && reg <= 0x04)
405 reg += 0x40;
406 pci_read_config_byte(router, reg, &x);
407 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
408 }
409
410 static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
411 {
412 u8 x;
413 int reg;
414
415 reg = pirq;
416 if (reg >= 0x01 && reg <= 0x04)
417 reg += 0x40;
418 pci_read_config_byte(router, reg, &x);
419 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
420 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
421 pci_write_config_byte(router, reg, x);
422 return 1;
423 }
424
425
426 /*
427 * VLSI: nibble offset 0x74 - educated guess due to routing table and
428 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
429 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
430 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
431 * for the busbridge to the docking station.
432 */
433
434 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
435 {
436 WARN_ON_ONCE(pirq >= 9);
437 if (pirq > 8) {
438 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
439 return 0;
440 }
441 return read_config_nybble(router, 0x74, pirq-1);
442 }
443
444 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
445 {
446 WARN_ON_ONCE(pirq >= 9);
447 if (pirq > 8) {
448 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
449 return 0;
450 }
451 write_config_nybble(router, 0x74, pirq-1, irq);
452 return 1;
453 }
454
455 /*
456 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
457 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
458 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
459 * register is a straight binary coding of desired PIC IRQ (low nibble).
460 *
461 * The 'link' value in the PIRQ table is already in the correct format
462 * for the Index register. There are some special index values:
463 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
464 * and 0x03 for SMBus.
465 */
466 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
467 {
468 outb(pirq, 0xc00);
469 return inb(0xc01) & 0xf;
470 }
471
472 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev,
473 int pirq, int irq)
474 {
475 outb(pirq, 0xc00);
476 outb(irq, 0xc01);
477 return 1;
478 }
479
480 /* Support for AMD756 PCI IRQ Routing
481 * Jhon H. Caicedo <jhcaiced@osso.org.co>
482 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
483 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
484 * The AMD756 pirq rules are nibble-based
485 * offset 0x56 0-3 PIRQA 4-7 PIRQB
486 * offset 0x57 0-3 PIRQC 4-7 PIRQD
487 */
488 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
489 {
490 u8 irq;
491 irq = 0;
492 if (pirq <= 4)
493 irq = read_config_nybble(router, 0x56, pirq - 1);
494 dev_info(&dev->dev,
495 "AMD756: dev [%04x:%04x], router PIRQ %d get IRQ %d\n",
496 dev->vendor, dev->device, pirq, irq);
497 return irq;
498 }
499
500 static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
501 {
502 dev_info(&dev->dev,
503 "AMD756: dev [%04x:%04x], router PIRQ %d set IRQ %d\n",
504 dev->vendor, dev->device, pirq, irq);
505 if (pirq <= 4)
506 write_config_nybble(router, 0x56, pirq - 1, irq);
507 return 1;
508 }
509
510 /*
511 * PicoPower PT86C523
512 */
513 static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
514 {
515 outb(0x10 + ((pirq - 1) >> 1), 0x24);
516 return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
517 }
518
519 static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
520 int irq)
521 {
522 unsigned int x;
523 outb(0x10 + ((pirq - 1) >> 1), 0x24);
524 x = inb(0x26);
525 x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
526 outb(x, 0x26);
527 return 1;
528 }
529
530 #ifdef CONFIG_PCI_BIOS
531
532 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
533 {
534 struct pci_dev *bridge;
535 int pin = pci_get_interrupt_pin(dev, &bridge);
536 return pcibios_set_irq_routing(bridge, pin - 1, irq);
537 }
538
539 #endif
540
541 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
542 {
543 static struct pci_device_id __initdata pirq_440gx[] = {
544 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
545 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
546 { },
547 };
548
549 /* 440GX has a proprietary PIRQ router -- don't use it */
550 if (pci_dev_present(pirq_440gx))
551 return 0;
552
553 switch (device) {
554 case PCI_DEVICE_ID_INTEL_82371FB_0:
555 case PCI_DEVICE_ID_INTEL_82371SB_0:
556 case PCI_DEVICE_ID_INTEL_82371AB_0:
557 case PCI_DEVICE_ID_INTEL_82371MX:
558 case PCI_DEVICE_ID_INTEL_82443MX_0:
559 case PCI_DEVICE_ID_INTEL_82801AA_0:
560 case PCI_DEVICE_ID_INTEL_82801AB_0:
561 case PCI_DEVICE_ID_INTEL_82801BA_0:
562 case PCI_DEVICE_ID_INTEL_82801BA_10:
563 case PCI_DEVICE_ID_INTEL_82801CA_0:
564 case PCI_DEVICE_ID_INTEL_82801CA_12:
565 case PCI_DEVICE_ID_INTEL_82801DB_0:
566 case PCI_DEVICE_ID_INTEL_82801E_0:
567 case PCI_DEVICE_ID_INTEL_82801EB_0:
568 case PCI_DEVICE_ID_INTEL_ESB_1:
569 case PCI_DEVICE_ID_INTEL_ICH6_0:
570 case PCI_DEVICE_ID_INTEL_ICH6_1:
571 case PCI_DEVICE_ID_INTEL_ICH7_0:
572 case PCI_DEVICE_ID_INTEL_ICH7_1:
573 case PCI_DEVICE_ID_INTEL_ICH7_30:
574 case PCI_DEVICE_ID_INTEL_ICH7_31:
575 case PCI_DEVICE_ID_INTEL_TGP_LPC:
576 case PCI_DEVICE_ID_INTEL_ESB2_0:
577 case PCI_DEVICE_ID_INTEL_ICH8_0:
578 case PCI_DEVICE_ID_INTEL_ICH8_1:
579 case PCI_DEVICE_ID_INTEL_ICH8_2:
580 case PCI_DEVICE_ID_INTEL_ICH8_3:
581 case PCI_DEVICE_ID_INTEL_ICH8_4:
582 case PCI_DEVICE_ID_INTEL_ICH9_0:
583 case PCI_DEVICE_ID_INTEL_ICH9_1:
584 case PCI_DEVICE_ID_INTEL_ICH9_2:
585 case PCI_DEVICE_ID_INTEL_ICH9_3:
586 case PCI_DEVICE_ID_INTEL_ICH9_4:
587 case PCI_DEVICE_ID_INTEL_ICH9_5:
588 case PCI_DEVICE_ID_INTEL_TOLAPAI_0:
589 case PCI_DEVICE_ID_INTEL_ICH10_0:
590 case PCI_DEVICE_ID_INTEL_ICH10_1:
591 case PCI_DEVICE_ID_INTEL_ICH10_2:
592 case PCI_DEVICE_ID_INTEL_ICH10_3:
593 r->name = "PIIX/ICH";
594 r->get = pirq_piix_get;
595 r->set = pirq_piix_set;
596 return 1;
597 }
598
599 if ((device >= PCI_DEVICE_ID_INTEL_PCH_LPC_MIN) &&
600 (device <= PCI_DEVICE_ID_INTEL_PCH_LPC_MAX)) {
601 r->name = "PIIX/ICH";
602 r->get = pirq_piix_get;
603 r->set = pirq_piix_set;
604 return 1;
605 }
606
607 return 0;
608 }
609
610 static __init int via_router_probe(struct irq_router *r,
611 struct pci_dev *router, u16 device)
612 {
613 /* FIXME: We should move some of the quirk fixup stuff here */
614
615 /*
616 * workarounds for some buggy BIOSes
617 */
618 if (device == PCI_DEVICE_ID_VIA_82C586_0) {
619 switch (router->device) {
620 case PCI_DEVICE_ID_VIA_82C686:
621 /*
622 * Asus k7m bios wrongly reports 82C686A
623 * as 586-compatible
624 */
625 device = PCI_DEVICE_ID_VIA_82C686;
626 break;
627 case PCI_DEVICE_ID_VIA_8235:
628 /**
629 * Asus a7v-x bios wrongly reports 8235
630 * as 586-compatible
631 */
632 device = PCI_DEVICE_ID_VIA_8235;
633 break;
634 case PCI_DEVICE_ID_VIA_8237:
635 /**
636 * Asus a7v600 bios wrongly reports 8237
637 * as 586-compatible
638 */
639 device = PCI_DEVICE_ID_VIA_8237;
640 break;
641 }
642 }
643
644 switch (device) {
645 case PCI_DEVICE_ID_VIA_82C586_0:
646 r->name = "VIA";
647 r->get = pirq_via586_get;
648 r->set = pirq_via586_set;
649 return 1;
650 case PCI_DEVICE_ID_VIA_82C596:
651 case PCI_DEVICE_ID_VIA_82C686:
652 case PCI_DEVICE_ID_VIA_8231:
653 case PCI_DEVICE_ID_VIA_8233A:
654 case PCI_DEVICE_ID_VIA_8235:
655 case PCI_DEVICE_ID_VIA_8237:
656 /* FIXME: add new ones for 8233/5 */
657 r->name = "VIA";
658 r->get = pirq_via_get;
659 r->set = pirq_via_set;
660 return 1;
661 }
662 return 0;
663 }
664
665 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
666 {
667 switch (device) {
668 case PCI_DEVICE_ID_VLSI_82C534:
669 r->name = "VLSI 82C534";
670 r->get = pirq_vlsi_get;
671 r->set = pirq_vlsi_set;
672 return 1;
673 }
674 return 0;
675 }
676
677
678 static __init int serverworks_router_probe(struct irq_router *r,
679 struct pci_dev *router, u16 device)
680 {
681 switch (device) {
682 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
683 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
684 r->name = "ServerWorks";
685 r->get = pirq_serverworks_get;
686 r->set = pirq_serverworks_set;
687 return 1;
688 }
689 return 0;
690 }
691
692 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
693 {
694 if (device != PCI_DEVICE_ID_SI_503)
695 return 0;
696
697 r->name = "SIS";
698 r->get = pirq_sis_get;
699 r->set = pirq_sis_set;
700 return 1;
701 }
702
703 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
704 {
705 switch (device) {
706 case PCI_DEVICE_ID_CYRIX_5520:
707 r->name = "NatSemi";
708 r->get = pirq_cyrix_get;
709 r->set = pirq_cyrix_set;
710 return 1;
711 }
712 return 0;
713 }
714
715 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
716 {
717 switch (device) {
718 case PCI_DEVICE_ID_OPTI_82C700:
719 r->name = "OPTI";
720 r->get = pirq_opti_get;
721 r->set = pirq_opti_set;
722 return 1;
723 }
724 return 0;
725 }
726
727 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
728 {
729 switch (device) {
730 case PCI_DEVICE_ID_ITE_IT8330G_0:
731 r->name = "ITE";
732 r->get = pirq_ite_get;
733 r->set = pirq_ite_set;
734 return 1;
735 }
736 return 0;
737 }
738
739 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
740 {
741 switch (device) {
742 case PCI_DEVICE_ID_AL_M1533:
743 case PCI_DEVICE_ID_AL_M1563:
744 r->name = "ALI";
745 r->get = pirq_ali_get;
746 r->set = pirq_ali_set;
747 return 1;
748 }
749 return 0;
750 }
751
752 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
753 {
754 switch (device) {
755 case PCI_DEVICE_ID_AMD_VIPER_740B:
756 r->name = "AMD756";
757 break;
758 case PCI_DEVICE_ID_AMD_VIPER_7413:
759 r->name = "AMD766";
760 break;
761 case PCI_DEVICE_ID_AMD_VIPER_7443:
762 r->name = "AMD768";
763 break;
764 default:
765 return 0;
766 }
767 r->get = pirq_amd756_get;
768 r->set = pirq_amd756_set;
769 return 1;
770 }
771
772 static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
773 {
774 switch (device) {
775 case PCI_DEVICE_ID_PICOPOWER_PT86C523:
776 r->name = "PicoPower PT86C523";
777 r->get = pirq_pico_get;
778 r->set = pirq_pico_set;
779 return 1;
780
781 case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
782 r->name = "PicoPower PT86C523 rev. BB+";
783 r->get = pirq_pico_get;
784 r->set = pirq_pico_set;
785 return 1;
786 }
787 return 0;
788 }
789
790 static __initdata struct irq_router_handler pirq_routers[] = {
791 { PCI_VENDOR_ID_INTEL, intel_router_probe },
792 { PCI_VENDOR_ID_AL, ali_router_probe },
793 { PCI_VENDOR_ID_ITE, ite_router_probe },
794 { PCI_VENDOR_ID_VIA, via_router_probe },
795 { PCI_VENDOR_ID_OPTI, opti_router_probe },
796 { PCI_VENDOR_ID_SI, sis_router_probe },
797 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
798 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
799 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
800 { PCI_VENDOR_ID_AMD, amd_router_probe },
801 { PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
802 /* Someone with docs needs to add the ATI Radeon IGP */
803 { 0, NULL }
804 };
805 static struct irq_router pirq_router;
806 static struct pci_dev *pirq_router_dev;
807
808
809 /*
810 * FIXME: should we have an option to say "generic for
811 * chipset" ?
812 */
813
814 static void __init pirq_find_router(struct irq_router *r)
815 {
816 struct irq_routing_table *rt = pirq_table;
817 struct irq_router_handler *h;
818
819 #ifdef CONFIG_PCI_BIOS
820 if (!rt->signature) {
821 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
822 r->set = pirq_bios_set;
823 r->name = "BIOS";
824 return;
825 }
826 #endif
827
828 /* Default unless a driver reloads it */
829 r->name = "default";
830 r->get = NULL;
831 r->set = NULL;
832
833 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n",
834 rt->rtr_vendor, rt->rtr_device);
835
836 pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
837 if (!pirq_router_dev) {
838 DBG(KERN_DEBUG "PCI: Interrupt router not found at "
839 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
840 return;
841 }
842
843 for (h = pirq_routers; h->vendor; h++) {
844 /* First look for a router match */
845 if (rt->rtr_vendor == h->vendor &&
846 h->probe(r, pirq_router_dev, rt->rtr_device))
847 break;
848 /* Fall back to a device match */
849 if (pirq_router_dev->vendor == h->vendor &&
850 h->probe(r, pirq_router_dev, pirq_router_dev->device))
851 break;
852 }
853 dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
854 pirq_router.name,
855 pirq_router_dev->vendor, pirq_router_dev->device);
856
857 /* The device remains referenced for the kernel lifetime */
858 }
859
860 static struct irq_info *pirq_get_info(struct pci_dev *dev)
861 {
862 struct irq_routing_table *rt = pirq_table;
863 int entries = (rt->size - sizeof(struct irq_routing_table)) /
864 sizeof(struct irq_info);
865 struct irq_info *info;
866
867 for (info = rt->slots; entries--; info++)
868 if (info->bus == dev->bus->number &&
869 PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
870 return info;
871 return NULL;
872 }
873
874 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
875 {
876 u8 pin;
877 struct irq_info *info;
878 int i, pirq, newirq;
879 int irq = 0;
880 u32 mask;
881 struct irq_router *r = &pirq_router;
882 struct pci_dev *dev2 = NULL;
883 char *msg = NULL;
884
885 /* Find IRQ pin */
886 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
887 if (!pin) {
888 dev_dbg(&dev->dev, "no interrupt pin\n");
889 return 0;
890 }
891
892 if (io_apic_assign_pci_irqs)
893 return 0;
894
895 /* Find IRQ routing entry */
896
897 if (!pirq_table)
898 return 0;
899
900 info = pirq_get_info(dev);
901 if (!info) {
902 dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n",
903 'A' + pin - 1);
904 return 0;
905 }
906 pirq = info->irq[pin - 1].link;
907 mask = info->irq[pin - 1].bitmap;
908 if (!pirq) {
909 dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + pin - 1);
910 return 0;
911 }
912 dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x",
913 'A' + pin - 1, pirq, mask, pirq_table->exclusive_irqs);
914 mask &= pcibios_irq_mask;
915
916 /* Work around broken HP Pavilion Notebooks which assign USB to
917 IRQ 9 even though it is actually wired to IRQ 11 */
918
919 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
920 dev->irq = 11;
921 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
922 r->set(pirq_router_dev, dev, pirq, 11);
923 }
924
925 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
926 if (acer_tm360_irqrouting && dev->irq == 11 &&
927 dev->vendor == PCI_VENDOR_ID_O2) {
928 pirq = 0x68;
929 mask = 0x400;
930 dev->irq = r->get(pirq_router_dev, dev, pirq);
931 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
932 }
933
934 /*
935 * Find the best IRQ to assign: use the one
936 * reported by the device if possible.
937 */
938 newirq = dev->irq;
939 if (newirq && !((1 << newirq) & mask)) {
940 if (pci_probe & PCI_USE_PIRQ_MASK)
941 newirq = 0;
942 else
943 dev_warn(&dev->dev, "IRQ %d doesn't match PIRQ mask "
944 "%#x; try pci=usepirqmask\n", newirq, mask);
945 }
946 if (!newirq && assign) {
947 for (i = 0; i < 16; i++) {
948 if (!(mask & (1 << i)))
949 continue;
950 if (pirq_penalty[i] < pirq_penalty[newirq] &&
951 can_request_irq(i, IRQF_SHARED))
952 newirq = i;
953 }
954 }
955 dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + pin - 1, newirq);
956
957 /* Check if it is hardcoded */
958 if ((pirq & 0xf0) == 0xf0) {
959 irq = pirq & 0xf;
960 msg = "hardcoded";
961 } else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
962 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) {
963 msg = "found";
964 eisa_set_level_irq(irq);
965 } else if (newirq && r->set &&
966 (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
967 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
968 eisa_set_level_irq(newirq);
969 msg = "assigned";
970 irq = newirq;
971 }
972 }
973
974 if (!irq) {
975 if (newirq && mask == (1 << newirq)) {
976 msg = "guessed";
977 irq = newirq;
978 } else {
979 dev_dbg(&dev->dev, "can't route interrupt\n");
980 return 0;
981 }
982 }
983 dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n", msg, 'A' + pin - 1, irq);
984
985 /* Update IRQ for all devices with the same pirq value */
986 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
987 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
988 if (!pin)
989 continue;
990
991 info = pirq_get_info(dev2);
992 if (!info)
993 continue;
994 if (info->irq[pin - 1].link == pirq) {
995 /*
996 * We refuse to override the dev->irq
997 * information. Give a warning!
998 */
999 if (dev2->irq && dev2->irq != irq && \
1000 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
1001 ((1 << dev2->irq) & mask))) {
1002 #ifndef CONFIG_PCI_MSI
1003 dev_info(&dev2->dev, "IRQ routing conflict: "
1004 "have IRQ %d, want IRQ %d\n",
1005 dev2->irq, irq);
1006 #endif
1007 continue;
1008 }
1009 dev2->irq = irq;
1010 pirq_penalty[irq]++;
1011 if (dev != dev2)
1012 dev_info(&dev->dev, "sharing IRQ %d with %s\n",
1013 irq, pci_name(dev2));
1014 }
1015 }
1016 return 1;
1017 }
1018
1019 static void __init pcibios_fixup_irqs(void)
1020 {
1021 struct pci_dev *dev = NULL;
1022 u8 pin;
1023
1024 DBG(KERN_DEBUG "PCI: IRQ fixup\n");
1025 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1026 /*
1027 * If the BIOS has set an out of range IRQ number, just
1028 * ignore it. Also keep track of which IRQ's are
1029 * already in use.
1030 */
1031 if (dev->irq >= 16) {
1032 dev_dbg(&dev->dev, "ignoring bogus IRQ %d\n", dev->irq);
1033 dev->irq = 0;
1034 }
1035 /*
1036 * If the IRQ is already assigned to a PCI device,
1037 * ignore its ISA use penalty
1038 */
1039 if (pirq_penalty[dev->irq] >= 100 &&
1040 pirq_penalty[dev->irq] < 100000)
1041 pirq_penalty[dev->irq] = 0;
1042 pirq_penalty[dev->irq]++;
1043 }
1044
1045 if (io_apic_assign_pci_irqs)
1046 return;
1047
1048 dev = NULL;
1049 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1050 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1051 if (!pin)
1052 continue;
1053
1054 /*
1055 * Still no IRQ? Try to lookup one...
1056 */
1057 if (!dev->irq)
1058 pcibios_lookup_irq(dev, 0);
1059 }
1060 }
1061
1062 /*
1063 * Work around broken HP Pavilion Notebooks which assign USB to
1064 * IRQ 9 even though it is actually wired to IRQ 11
1065 */
1066 static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
1067 {
1068 if (!broken_hp_bios_irq9) {
1069 broken_hp_bios_irq9 = 1;
1070 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1071 d->ident);
1072 }
1073 return 0;
1074 }
1075
1076 /*
1077 * Work around broken Acer TravelMate 360 Notebooks which assign
1078 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
1079 */
1080 static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
1081 {
1082 if (!acer_tm360_irqrouting) {
1083 acer_tm360_irqrouting = 1;
1084 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1085 d->ident);
1086 }
1087 return 0;
1088 }
1089
1090 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
1091 {
1092 .callback = fix_broken_hp_bios_irq9,
1093 .ident = "HP Pavilion N5400 Series Laptop",
1094 .matches = {
1095 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1096 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
1097 DMI_MATCH(DMI_PRODUCT_VERSION,
1098 "HP Pavilion Notebook Model GE"),
1099 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
1100 },
1101 },
1102 {
1103 .callback = fix_acer_tm360_irqrouting,
1104 .ident = "Acer TravelMate 36x Laptop",
1105 .matches = {
1106 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1107 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1108 },
1109 },
1110 { }
1111 };
1112
1113 int __init pcibios_irq_init(void)
1114 {
1115 DBG(KERN_DEBUG "PCI: IRQ init\n");
1116
1117 if (pcibios_enable_irq || raw_pci_ops == NULL)
1118 return 0;
1119
1120 dmi_check_system(pciirq_dmi_table);
1121
1122 pirq_table = pirq_find_routing_table();
1123
1124 #ifdef CONFIG_PCI_BIOS
1125 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
1126 pirq_table = pcibios_get_irq_routing_table();
1127 #endif
1128 if (pirq_table) {
1129 pirq_peer_trick();
1130 pirq_find_router(&pirq_router);
1131 if (pirq_table->exclusive_irqs) {
1132 int i;
1133 for (i = 0; i < 16; i++)
1134 if (!(pirq_table->exclusive_irqs & (1 << i)))
1135 pirq_penalty[i] += 100;
1136 }
1137 /*
1138 * If we're using the I/O APIC, avoid using the PCI IRQ
1139 * routing table
1140 */
1141 if (io_apic_assign_pci_irqs)
1142 pirq_table = NULL;
1143 }
1144
1145 pcibios_enable_irq = pirq_enable_irq;
1146
1147 pcibios_fixup_irqs();
1148
1149 if (io_apic_assign_pci_irqs && pci_routeirq) {
1150 struct pci_dev *dev = NULL;
1151 /*
1152 * PCI IRQ routing is set up by pci_enable_device(), but we
1153 * also do it here in case there are still broken drivers that
1154 * don't use pci_enable_device().
1155 */
1156 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
1157 for_each_pci_dev(dev)
1158 pirq_enable_irq(dev);
1159 }
1160
1161 return 0;
1162 }
1163
1164 static void pirq_penalize_isa_irq(int irq, int active)
1165 {
1166 /*
1167 * If any ISAPnP device reports an IRQ in its list of possible
1168 * IRQ's, we try to avoid assigning it to PCI devices.
1169 */
1170 if (irq < 16) {
1171 if (active)
1172 pirq_penalty[irq] += 1000;
1173 else
1174 pirq_penalty[irq] += 100;
1175 }
1176 }
1177
1178 void pcibios_penalize_isa_irq(int irq, int active)
1179 {
1180 #ifdef CONFIG_ACPI
1181 if (!acpi_noirq)
1182 acpi_penalize_isa_irq(irq, active);
1183 else
1184 #endif
1185 pirq_penalize_isa_irq(irq, active);
1186 }
1187
1188 static int pirq_enable_irq(struct pci_dev *dev)
1189 {
1190 u8 pin;
1191
1192 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1193 if (pin && !pcibios_lookup_irq(dev, 1)) {
1194 char *msg = "";
1195
1196 if (!io_apic_assign_pci_irqs && dev->irq)
1197 return 0;
1198
1199 if (io_apic_assign_pci_irqs) {
1200 #ifdef CONFIG_X86_IO_APIC
1201 struct pci_dev *temp_dev;
1202 int irq;
1203 struct io_apic_irq_attr irq_attr;
1204
1205 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
1206 PCI_SLOT(dev->devfn),
1207 pin - 1, &irq_attr);
1208 /*
1209 * Busses behind bridges are typically not listed in the MP-table.
1210 * In this case we have to look up the IRQ based on the parent bus,
1211 * parent slot, and pin number. The SMP code detects such bridged
1212 * busses itself so we should get into this branch reliably.
1213 */
1214 temp_dev = dev;
1215 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1216 struct pci_dev *bridge = dev->bus->self;
1217
1218 pin = pci_swizzle_interrupt_pin(dev, pin);
1219 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1220 PCI_SLOT(bridge->devfn),
1221 pin - 1, &irq_attr);
1222 if (irq >= 0)
1223 dev_warn(&dev->dev, "using bridge %s "
1224 "INT %c to get IRQ %d\n",
1225 pci_name(bridge), 'A' + pin - 1,
1226 irq);
1227 dev = bridge;
1228 }
1229 dev = temp_dev;
1230 if (irq >= 0) {
1231 io_apic_set_pci_routing(&dev->dev, irq,
1232 &irq_attr);
1233 dev->irq = irq;
1234 dev_info(&dev->dev, "PCI->APIC IRQ transform: "
1235 "INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
1236 return 0;
1237 } else
1238 msg = "; probably buggy MP table";
1239 #endif
1240 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1241 msg = "";
1242 else
1243 msg = "; please try using pci=biosirq";
1244
1245 /*
1246 * With IDE legacy devices the IRQ lookup failure is not
1247 * a problem..
1248 */
1249 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
1250 !(dev->class & 0x5))
1251 return 0;
1252
1253 dev_warn(&dev->dev, "can't find IRQ for PCI INT %c%s\n",
1254 'A' + pin - 1, msg);
1255 }
1256 return 0;
1257 }
Linux kernel - Deliverables
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