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path: root/drivers/pci/hotplug/acpiphp_glue.c
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Diffstat (limited to 'drivers/pci/hotplug/acpiphp_glue.c')
-rw-r--r--drivers/pci/hotplug/acpiphp_glue.c1344
1 files changed, 1344 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
new file mode 100644
index 000000000000..e7f41294f811
--- /dev/null
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -0,0 +1,1344 @@
1/*
2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
3 *
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Send feedback to <t-kochi@bq.jp.nec.com>
26 *
27 */
28
29#include <linux/init.h>
30#include <linux/module.h>
31
32#include <linux/kernel.h>
33#include <linux/pci.h>
34#include <linux/smp_lock.h>
35#include <asm/semaphore.h>
36
37#include "../pci.h"
38#include "pci_hotplug.h"
39#include "acpiphp.h"
40
41static LIST_HEAD(bridge_list);
42
43#define MY_NAME "acpiphp_glue"
44
45static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
46static void handle_hotplug_event_func (acpi_handle, u32, void *);
47
48/*
49 * initialization & terminatation routines
50 */
51
52/**
53 * is_ejectable - determine if a slot is ejectable
54 * @handle: handle to acpi namespace
55 *
56 * Ejectable slot should satisfy at least these conditions:
57 *
58 * 1. has _ADR method
59 * 2. has _EJ0 method
60 *
61 * optionally
62 *
63 * 1. has _STA method
64 * 2. has _PS0 method
65 * 3. has _PS3 method
66 * 4. ..
67 *
68 */
69static int is_ejectable(acpi_handle handle)
70{
71 acpi_status status;
72 acpi_handle tmp;
73
74 status = acpi_get_handle(handle, "_ADR", &tmp);
75 if (ACPI_FAILURE(status)) {
76 return 0;
77 }
78
79 status = acpi_get_handle(handle, "_EJ0", &tmp);
80 if (ACPI_FAILURE(status)) {
81 return 0;
82 }
83
84 return 1;
85}
86
87
88/* callback routine to check the existence of ejectable slots */
89static acpi_status
90is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
91{
92 int *count = (int *)context;
93
94 if (is_ejectable(handle)) {
95 (*count)++;
96 /* only one ejectable slot is enough */
97 return AE_CTRL_TERMINATE;
98 } else {
99 return AE_OK;
100 }
101}
102
103
104/* callback routine to register each ACPI PCI slot object */
105static acpi_status
106register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
107{
108 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
109 struct acpiphp_slot *slot;
110 struct acpiphp_func *newfunc;
111 acpi_handle tmp;
112 acpi_status status = AE_OK;
113 unsigned long adr, sun;
114 int device, function;
115 static int num_slots = 0; /* XXX if we support I/O node hotplug... */
116
117 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
118
119 if (ACPI_FAILURE(status))
120 return AE_OK;
121
122 status = acpi_get_handle(handle, "_EJ0", &tmp);
123
124 if (ACPI_FAILURE(status))
125 return AE_OK;
126
127 device = (adr >> 16) & 0xffff;
128 function = adr & 0xffff;
129
130 newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
131 if (!newfunc)
132 return AE_NO_MEMORY;
133 memset(newfunc, 0, sizeof(struct acpiphp_func));
134
135 INIT_LIST_HEAD(&newfunc->sibling);
136 newfunc->handle = handle;
137 newfunc->function = function;
138 newfunc->flags = FUNC_HAS_EJ0;
139
140 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
141 newfunc->flags |= FUNC_HAS_STA;
142
143 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
144 newfunc->flags |= FUNC_HAS_PS0;
145
146 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
147 newfunc->flags |= FUNC_HAS_PS3;
148
149 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
150 if (ACPI_FAILURE(status))
151 sun = -1;
152
153 /* search for objects that share the same slot */
154 for (slot = bridge->slots; slot; slot = slot->next)
155 if (slot->device == device) {
156 if (slot->sun != sun)
157 warn("sibling found, but _SUN doesn't match!\n");
158 break;
159 }
160
161 if (!slot) {
162 slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
163 if (!slot) {
164 kfree(newfunc);
165 return AE_NO_MEMORY;
166 }
167
168 memset(slot, 0, sizeof(struct acpiphp_slot));
169 slot->bridge = bridge;
170 slot->id = num_slots++;
171 slot->device = device;
172 slot->sun = sun;
173 INIT_LIST_HEAD(&slot->funcs);
174 init_MUTEX(&slot->crit_sect);
175
176 slot->next = bridge->slots;
177 bridge->slots = slot;
178
179 bridge->nr_slots++;
180
181 dbg("found ACPI PCI Hotplug slot at PCI %02x:%02x Slot:%d\n",
182 slot->bridge->bus, slot->device, slot->sun);
183 }
184
185 newfunc->slot = slot;
186 list_add_tail(&newfunc->sibling, &slot->funcs);
187
188 /* associate corresponding pci_dev */
189 newfunc->pci_dev = pci_find_slot(bridge->bus,
190 PCI_DEVFN(device, function));
191 if (newfunc->pci_dev) {
192 if (acpiphp_init_func_resource(newfunc) < 0) {
193 kfree(newfunc);
194 return AE_ERROR;
195 }
196 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
197 }
198
199 /* install notify handler */
200 status = acpi_install_notify_handler(handle,
201 ACPI_SYSTEM_NOTIFY,
202 handle_hotplug_event_func,
203 newfunc);
204
205 if (ACPI_FAILURE(status)) {
206 err("failed to register interrupt notify handler\n");
207 return status;
208 }
209
210 return AE_OK;
211}
212
213
214/* see if it's worth looking at this bridge */
215static int detect_ejectable_slots(acpi_handle *bridge_handle)
216{
217 acpi_status status;
218 int count;
219
220 count = 0;
221
222 /* only check slots defined directly below bridge object */
223 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
224 is_ejectable_slot, (void *)&count, NULL);
225
226 return count;
227}
228
229
230/* decode ACPI _CRS data and convert into our internal resource list
231 * TBD: _TRA, etc.
232 */
233static acpi_status
234decode_acpi_resource(struct acpi_resource *resource, void *context)
235{
236 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *) context;
237 struct acpi_resource_address64 address;
238 struct pci_resource *res;
239
240 if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
241 resource->id != ACPI_RSTYPE_ADDRESS32 &&
242 resource->id != ACPI_RSTYPE_ADDRESS64)
243 return AE_OK;
244
245 acpi_resource_to_address64(resource, &address);
246
247 if (address.producer_consumer == ACPI_PRODUCER && address.address_length > 0) {
248 dbg("resource type: %d: 0x%llx - 0x%llx\n", address.resource_type,
249 (unsigned long long)address.min_address_range,
250 (unsigned long long)address.max_address_range);
251 res = acpiphp_make_resource(address.min_address_range,
252 address.address_length);
253 if (!res) {
254 err("out of memory\n");
255 return AE_OK;
256 }
257
258 switch (address.resource_type) {
259 case ACPI_MEMORY_RANGE:
260 if (address.attribute.memory.cache_attribute == ACPI_PREFETCHABLE_MEMORY) {
261 res->next = bridge->p_mem_head;
262 bridge->p_mem_head = res;
263 } else {
264 res->next = bridge->mem_head;
265 bridge->mem_head = res;
266 }
267 break;
268 case ACPI_IO_RANGE:
269 res->next = bridge->io_head;
270 bridge->io_head = res;
271 break;
272 case ACPI_BUS_NUMBER_RANGE:
273 res->next = bridge->bus_head;
274 bridge->bus_head = res;
275 break;
276 default:
277 /* invalid type */
278 kfree(res);
279 break;
280 }
281 }
282
283 return AE_OK;
284}
285
286/* decode ACPI 2.0 _HPP hot plug parameters */
287static void decode_hpp(struct acpiphp_bridge *bridge)
288{
289 acpi_status status;
290 struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
291 .pointer = NULL};
292 union acpi_object *package;
293 int i;
294
295 /* default numbers */
296 bridge->hpp.cache_line_size = 0x10;
297 bridge->hpp.latency_timer = 0x40;
298 bridge->hpp.enable_SERR = 0;
299 bridge->hpp.enable_PERR = 0;
300
301 status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
302
303 if (ACPI_FAILURE(status)) {
304 dbg("_HPP evaluation failed\n");
305 return;
306 }
307
308 package = (union acpi_object *) buffer.pointer;
309
310 if (!package || package->type != ACPI_TYPE_PACKAGE ||
311 package->package.count != 4 || !package->package.elements) {
312 err("invalid _HPP object; ignoring\n");
313 goto err_exit;
314 }
315
316 for (i = 0; i < 4; i++) {
317 if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
318 err("invalid _HPP parameter type; ignoring\n");
319 goto err_exit;
320 }
321 }
322
323 bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
324 bridge->hpp.latency_timer = package->package.elements[1].integer.value;
325 bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
326 bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
327
328 dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
329 bridge->hpp.cache_line_size,
330 bridge->hpp.latency_timer,
331 bridge->hpp.enable_SERR,
332 bridge->hpp.enable_PERR);
333
334 bridge->flags |= BRIDGE_HAS_HPP;
335
336 err_exit:
337 kfree(buffer.pointer);
338}
339
340
341/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
342static void init_bridge_misc(struct acpiphp_bridge *bridge)
343{
344 acpi_status status;
345
346 /* decode ACPI 2.0 _HPP (hot plug parameters) */
347 decode_hpp(bridge);
348
349 /* subtract all resources already allocated */
350 acpiphp_detect_pci_resource(bridge);
351
352 /* register all slot objects under this bridge */
353 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
354 register_slot, bridge, NULL);
355
356 /* install notify handler */
357 status = acpi_install_notify_handler(bridge->handle,
358 ACPI_SYSTEM_NOTIFY,
359 handle_hotplug_event_bridge,
360 bridge);
361
362 if (ACPI_FAILURE(status)) {
363 err("failed to register interrupt notify handler\n");
364 }
365
366 list_add(&bridge->list, &bridge_list);
367
368 dbg("Bridge resource:\n");
369 acpiphp_dump_resource(bridge);
370}
371
372
373/* allocate and initialize host bridge data structure */
374static void add_host_bridge(acpi_handle *handle, int seg, int bus)
375{
376 acpi_status status;
377 struct acpiphp_bridge *bridge;
378
379 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
380 if (bridge == NULL)
381 return;
382
383 memset(bridge, 0, sizeof(struct acpiphp_bridge));
384
385 bridge->type = BRIDGE_TYPE_HOST;
386 bridge->handle = handle;
387 bridge->seg = seg;
388 bridge->bus = bus;
389
390 bridge->pci_bus = pci_find_bus(seg, bus);
391
392 spin_lock_init(&bridge->res_lock);
393
394 /* to be overridden when we decode _CRS */
395 bridge->sub = bridge->bus;
396
397 /* decode resources */
398
399 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
400 decode_acpi_resource, bridge);
401
402 if (ACPI_FAILURE(status)) {
403 err("failed to decode bridge resources\n");
404 kfree(bridge);
405 return;
406 }
407
408 acpiphp_resource_sort_and_combine(&bridge->io_head);
409 acpiphp_resource_sort_and_combine(&bridge->mem_head);
410 acpiphp_resource_sort_and_combine(&bridge->p_mem_head);
411 acpiphp_resource_sort_and_combine(&bridge->bus_head);
412
413 dbg("ACPI _CRS resource:\n");
414 acpiphp_dump_resource(bridge);
415
416 if (bridge->bus_head) {
417 bridge->bus = bridge->bus_head->base;
418 bridge->sub = bridge->bus_head->base + bridge->bus_head->length - 1;
419 }
420
421 init_bridge_misc(bridge);
422}
423
424
425/* allocate and initialize PCI-to-PCI bridge data structure */
426static void add_p2p_bridge(acpi_handle *handle, int seg, int bus, int dev, int fn)
427{
428 struct acpiphp_bridge *bridge;
429 u8 tmp8;
430 u16 tmp16;
431 u64 base64, limit64;
432 u32 base, limit, base32u, limit32u;
433
434 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
435 if (bridge == NULL) {
436 err("out of memory\n");
437 return;
438 }
439
440 memset(bridge, 0, sizeof(struct acpiphp_bridge));
441
442 bridge->type = BRIDGE_TYPE_P2P;
443 bridge->handle = handle;
444 bridge->seg = seg;
445
446 bridge->pci_dev = pci_find_slot(bus, PCI_DEVFN(dev, fn));
447 if (!bridge->pci_dev) {
448 err("Can't get pci_dev\n");
449 kfree(bridge);
450 return;
451 }
452
453 bridge->pci_bus = bridge->pci_dev->subordinate;
454 if (!bridge->pci_bus) {
455 err("This is not a PCI-to-PCI bridge!\n");
456 kfree(bridge);
457 return;
458 }
459
460 spin_lock_init(&bridge->res_lock);
461
462 bridge->bus = bridge->pci_bus->number;
463 bridge->sub = bridge->pci_bus->subordinate;
464
465 /*
466 * decode resources under this P2P bridge
467 */
468
469 /* I/O resources */
470 pci_read_config_byte(bridge->pci_dev, PCI_IO_BASE, &tmp8);
471 base = tmp8;
472 pci_read_config_byte(bridge->pci_dev, PCI_IO_LIMIT, &tmp8);
473 limit = tmp8;
474
475 switch (base & PCI_IO_RANGE_TYPE_MASK) {
476 case PCI_IO_RANGE_TYPE_16:
477 base = (base << 8) & 0xf000;
478 limit = ((limit << 8) & 0xf000) + 0xfff;
479 bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1);
480 if (!bridge->io_head) {
481 err("out of memory\n");
482 kfree(bridge);
483 return;
484 }
485 dbg("16bit I/O range: %04x-%04x\n",
486 (u32)bridge->io_head->base,
487 (u32)(bridge->io_head->base + bridge->io_head->length - 1));
488 break;
489 case PCI_IO_RANGE_TYPE_32:
490 pci_read_config_word(bridge->pci_dev, PCI_IO_BASE_UPPER16, &tmp16);
491 base = ((u32)tmp16 << 16) | ((base << 8) & 0xf000);
492 pci_read_config_word(bridge->pci_dev, PCI_IO_LIMIT_UPPER16, &tmp16);
493 limit = (((u32)tmp16 << 16) | ((limit << 8) & 0xf000)) + 0xfff;
494 bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1);
495 if (!bridge->io_head) {
496 err("out of memory\n");
497 kfree(bridge);
498 return;
499 }
500 dbg("32bit I/O range: %08x-%08x\n",
501 (u32)bridge->io_head->base,
502 (u32)(bridge->io_head->base + bridge->io_head->length - 1));
503 break;
504 case 0x0f:
505 dbg("I/O space unsupported\n");
506 break;
507 default:
508 warn("Unknown I/O range type\n");
509 }
510
511 /* Memory resources (mandatory for P2P bridge) */
512 pci_read_config_word(bridge->pci_dev, PCI_MEMORY_BASE, &tmp16);
513 base = (tmp16 & 0xfff0) << 16;
514 pci_read_config_word(bridge->pci_dev, PCI_MEMORY_LIMIT, &tmp16);
515 limit = ((tmp16 & 0xfff0) << 16) | 0xfffff;
516 bridge->mem_head = acpiphp_make_resource((u64)base, limit - base + 1);
517 if (!bridge->mem_head) {
518 err("out of memory\n");
519 kfree(bridge);
520 return;
521 }
522 dbg("32bit Memory range: %08x-%08x\n",
523 (u32)bridge->mem_head->base,
524 (u32)(bridge->mem_head->base + bridge->mem_head->length-1));
525
526 /* Prefetchable Memory resources (optional) */
527 pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_BASE, &tmp16);
528 base = tmp16;
529 pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_LIMIT, &tmp16);
530 limit = tmp16;
531
532 switch (base & PCI_MEMORY_RANGE_TYPE_MASK) {
533 case PCI_PREF_RANGE_TYPE_32:
534 base = (base & 0xfff0) << 16;
535 limit = ((limit & 0xfff0) << 16) | 0xfffff;
536 bridge->p_mem_head = acpiphp_make_resource((u64)base, limit - base + 1);
537 if (!bridge->p_mem_head) {
538 err("out of memory\n");
539 kfree(bridge);
540 return;
541 }
542 dbg("32bit Prefetchable memory range: %08x-%08x\n",
543 (u32)bridge->p_mem_head->base,
544 (u32)(bridge->p_mem_head->base + bridge->p_mem_head->length - 1));
545 break;
546 case PCI_PREF_RANGE_TYPE_64:
547 pci_read_config_dword(bridge->pci_dev, PCI_PREF_BASE_UPPER32, &base32u);
548 pci_read_config_dword(bridge->pci_dev, PCI_PREF_LIMIT_UPPER32, &limit32u);
549 base64 = ((u64)base32u << 32) | ((base & 0xfff0) << 16);
550 limit64 = (((u64)limit32u << 32) | ((limit & 0xfff0) << 16)) + 0xfffff;
551
552 bridge->p_mem_head = acpiphp_make_resource(base64, limit64 - base64 + 1);
553 if (!bridge->p_mem_head) {
554 err("out of memory\n");
555 kfree(bridge);
556 return;
557 }
558 dbg("64bit Prefetchable memory range: %08x%08x-%08x%08x\n",
559 (u32)(bridge->p_mem_head->base >> 32),
560 (u32)(bridge->p_mem_head->base & 0xffffffff),
561 (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) >> 32),
562 (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) & 0xffffffff));
563 break;
564 case 0x0f:
565 break;
566 default:
567 warn("Unknown prefetchale memory type\n");
568 }
569
570 init_bridge_misc(bridge);
571}
572
573
574/* callback routine to find P2P bridges */
575static acpi_status
576find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
577{
578 acpi_status status;
579 acpi_handle dummy_handle;
580 unsigned long *segbus = context;
581 unsigned long tmp;
582 int seg, bus, device, function;
583 struct pci_dev *dev;
584
585 /* get PCI address */
586 seg = (*segbus >> 8) & 0xff;
587 bus = *segbus & 0xff;
588
589 status = acpi_get_handle(handle, "_ADR", &dummy_handle);
590 if (ACPI_FAILURE(status))
591 return AE_OK; /* continue */
592
593 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
594 if (ACPI_FAILURE(status)) {
595 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
596 return AE_OK;
597 }
598
599 device = (tmp >> 16) & 0xffff;
600 function = tmp & 0xffff;
601
602 dev = pci_find_slot(bus, PCI_DEVFN(device, function));
603
604 if (!dev)
605 return AE_OK;
606
607 if (!dev->subordinate)
608 return AE_OK;
609
610 /* check if this bridge has ejectable slots */
611 if (detect_ejectable_slots(handle) > 0) {
612 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
613 add_p2p_bridge(handle, seg, bus, device, function);
614 }
615
616 return AE_OK;
617}
618
619
620/* find hot-pluggable slots, and then find P2P bridge */
621static int add_bridge(acpi_handle handle)
622{
623 acpi_status status;
624 unsigned long tmp;
625 int seg, bus;
626 acpi_handle dummy_handle;
627
628 /* if the bridge doesn't have _STA, we assume it is always there */
629 status = acpi_get_handle(handle, "_STA", &dummy_handle);
630 if (ACPI_SUCCESS(status)) {
631 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
632 if (ACPI_FAILURE(status)) {
633 dbg("%s: _STA evaluation failure\n", __FUNCTION__);
634 return 0;
635 }
636 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
637 /* don't register this object */
638 return 0;
639 }
640
641 /* get PCI segment number */
642 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
643
644 seg = ACPI_SUCCESS(status) ? tmp : 0;
645
646 /* get PCI bus number */
647 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
648
649 if (ACPI_SUCCESS(status)) {
650 bus = tmp;
651 } else {
652 warn("can't get bus number, assuming 0\n");
653 bus = 0;
654 }
655
656 /* check if this bridge has ejectable slots */
657 if (detect_ejectable_slots(handle) > 0) {
658 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
659 add_host_bridge(handle, seg, bus);
660 return 0;
661 }
662
663 tmp = seg << 8 | bus;
664
665 /* search P2P bridges under this host bridge */
666 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
667 find_p2p_bridge, &tmp, NULL);
668
669 if (ACPI_FAILURE(status))
670 warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
671
672 return 0;
673}
674
675
676static void remove_bridge(acpi_handle handle)
677{
678 /* No-op for now .. */
679}
680
681
682static int power_on_slot(struct acpiphp_slot *slot)
683{
684 acpi_status status;
685 struct acpiphp_func *func;
686 struct list_head *l;
687 int retval = 0;
688
689 /* if already enabled, just skip */
690 if (slot->flags & SLOT_POWEREDON)
691 goto err_exit;
692
693 list_for_each (l, &slot->funcs) {
694 func = list_entry(l, struct acpiphp_func, sibling);
695
696 if (func->flags & FUNC_HAS_PS0) {
697 dbg("%s: executing _PS0\n", __FUNCTION__);
698 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
699 if (ACPI_FAILURE(status)) {
700 warn("%s: _PS0 failed\n", __FUNCTION__);
701 retval = -1;
702 goto err_exit;
703 } else
704 break;
705 }
706 }
707
708 /* TBD: evaluate _STA to check if the slot is enabled */
709
710 slot->flags |= SLOT_POWEREDON;
711
712 err_exit:
713 return retval;
714}
715
716
717static int power_off_slot(struct acpiphp_slot *slot)
718{
719 acpi_status status;
720 struct acpiphp_func *func;
721 struct list_head *l;
722 struct acpi_object_list arg_list;
723 union acpi_object arg;
724
725 int retval = 0;
726
727 /* if already disabled, just skip */
728 if ((slot->flags & SLOT_POWEREDON) == 0)
729 goto err_exit;
730
731 list_for_each (l, &slot->funcs) {
732 func = list_entry(l, struct acpiphp_func, sibling);
733
734 if (func->pci_dev && (func->flags & FUNC_HAS_PS3)) {
735 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
736 if (ACPI_FAILURE(status)) {
737 warn("%s: _PS3 failed\n", __FUNCTION__);
738 retval = -1;
739 goto err_exit;
740 } else
741 break;
742 }
743 }
744
745 list_for_each (l, &slot->funcs) {
746 func = list_entry(l, struct acpiphp_func, sibling);
747
748 /* We don't want to call _EJ0 on non-existing functions. */
749 if (func->pci_dev && (func->flags & FUNC_HAS_EJ0)) {
750 /* _EJ0 method take one argument */
751 arg_list.count = 1;
752 arg_list.pointer = &arg;
753 arg.type = ACPI_TYPE_INTEGER;
754 arg.integer.value = 1;
755
756 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
757 if (ACPI_FAILURE(status)) {
758 warn("%s: _EJ0 failed\n", __FUNCTION__);
759 retval = -1;
760 goto err_exit;
761 } else
762 break;
763 }
764 }
765
766 /* TBD: evaluate _STA to check if the slot is disabled */
767
768 slot->flags &= (~SLOT_POWEREDON);
769
770 err_exit:
771 return retval;
772}
773
774
775/**
776 * enable_device - enable, configure a slot
777 * @slot: slot to be enabled
778 *
779 * This function should be called per *physical slot*,
780 * not per each slot object in ACPI namespace.
781 *
782 */
783static int enable_device(struct acpiphp_slot *slot)
784{
785 u8 bus;
786 struct pci_dev *dev;
787 struct pci_bus *child;
788 struct list_head *l;
789 struct acpiphp_func *func;
790 int retval = 0;
791 int num;
792
793 if (slot->flags & SLOT_ENABLED)
794 goto err_exit;
795
796 /* sanity check: dev should be NULL when hot-plugged in */
797 dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0));
798 if (dev) {
799 /* This case shouldn't happen */
800 err("pci_dev structure already exists.\n");
801 retval = -1;
802 goto err_exit;
803 }
804
805 /* allocate resources to device */
806 retval = acpiphp_configure_slot(slot);
807 if (retval)
808 goto err_exit;
809
810 /* returned `dev' is the *first function* only! */
811 num = pci_scan_slot(slot->bridge->pci_bus, PCI_DEVFN(slot->device, 0));
812 if (num)
813 pci_bus_add_devices(slot->bridge->pci_bus);
814 dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0));
815
816 if (!dev) {
817 err("No new device found\n");
818 retval = -1;
819 goto err_exit;
820 }
821
822 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
823 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &bus);
824 child = (struct pci_bus*) pci_add_new_bus(dev->bus, dev, bus);
825 pci_do_scan_bus(child);
826 }
827
828 /* associate pci_dev to our representation */
829 list_for_each (l, &slot->funcs) {
830 func = list_entry(l, struct acpiphp_func, sibling);
831
832 func->pci_dev = pci_find_slot(slot->bridge->bus,
833 PCI_DEVFN(slot->device,
834 func->function));
835 if (!func->pci_dev)
836 continue;
837
838 /* configure device */
839 retval = acpiphp_configure_function(func);
840 if (retval)
841 goto err_exit;
842 }
843
844 slot->flags |= SLOT_ENABLED;
845
846 dbg("Available resources:\n");
847 acpiphp_dump_resource(slot->bridge);
848
849 err_exit:
850 return retval;
851}
852
853
854/**
855 * disable_device - disable a slot
856 */
857static int disable_device(struct acpiphp_slot *slot)
858{
859 int retval = 0;
860 struct acpiphp_func *func;
861 struct list_head *l;
862
863 /* is this slot already disabled? */
864 if (!(slot->flags & SLOT_ENABLED))
865 goto err_exit;
866
867 list_for_each (l, &slot->funcs) {
868 func = list_entry(l, struct acpiphp_func, sibling);
869
870 if (func->pci_dev)
871 acpiphp_unconfigure_function(func);
872 }
873
874 slot->flags &= (~SLOT_ENABLED);
875
876 err_exit:
877 return retval;
878}
879
880
881/**
882 * get_slot_status - get ACPI slot status
883 *
884 * if a slot has _STA for each function and if any one of them
885 * returned non-zero status, return it
886 *
887 * if a slot doesn't have _STA and if any one of its functions'
888 * configuration space is configured, return 0x0f as a _STA
889 *
890 * otherwise return 0
891 */
892static unsigned int get_slot_status(struct acpiphp_slot *slot)
893{
894 acpi_status status;
895 unsigned long sta = 0;
896 u32 dvid;
897 struct list_head *l;
898 struct acpiphp_func *func;
899
900 list_for_each (l, &slot->funcs) {
901 func = list_entry(l, struct acpiphp_func, sibling);
902
903 if (func->flags & FUNC_HAS_STA) {
904 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
905 if (ACPI_SUCCESS(status) && sta)
906 break;
907 } else {
908 pci_bus_read_config_dword(slot->bridge->pci_bus,
909 PCI_DEVFN(slot->device,
910 func->function),
911 PCI_VENDOR_ID, &dvid);
912 if (dvid != 0xffffffff) {
913 sta = ACPI_STA_ALL;
914 break;
915 }
916 }
917 }
918
919 return (unsigned int)sta;
920}
921
922/**
923 * acpiphp_check_bridge - re-enumerate devices
924 *
925 * Iterate over all slots under this bridge and make sure that if a
926 * card is present they are enabled, and if not they are disabled.
927 */
928static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
929{
930 struct acpiphp_slot *slot;
931 int retval = 0;
932 int enabled, disabled;
933
934 enabled = disabled = 0;
935
936 for (slot = bridge->slots; slot; slot = slot->next) {
937 unsigned int status = get_slot_status(slot);
938 if (slot->flags & SLOT_ENABLED) {
939 if (status == ACPI_STA_ALL)
940 continue;
941 retval = acpiphp_disable_slot(slot);
942 if (retval) {
943 err("Error occurred in disabling\n");
944 goto err_exit;
945 }
946 disabled++;
947 } else {
948 if (status != ACPI_STA_ALL)
949 continue;
950 retval = acpiphp_enable_slot(slot);
951 if (retval) {
952 err("Error occurred in enabling\n");
953 goto err_exit;
954 }
955 enabled++;
956 }
957 }
958
959 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
960
961 err_exit:
962 return retval;
963}
964
965/*
966 * ACPI event handlers
967 */
968
969/**
970 * handle_hotplug_event_bridge - handle ACPI event on bridges
971 *
972 * @handle: Notify()'ed acpi_handle
973 * @type: Notify code
974 * @context: pointer to acpiphp_bridge structure
975 *
976 * handles ACPI event notification on {host,p2p} bridges
977 *
978 */
979static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
980{
981 struct acpiphp_bridge *bridge;
982 char objname[64];
983 struct acpi_buffer buffer = { .length = sizeof(objname),
984 .pointer = objname };
985
986 bridge = (struct acpiphp_bridge *)context;
987
988 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
989
990 switch (type) {
991 case ACPI_NOTIFY_BUS_CHECK:
992 /* bus re-enumerate */
993 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
994 acpiphp_check_bridge(bridge);
995 break;
996
997 case ACPI_NOTIFY_DEVICE_CHECK:
998 /* device check */
999 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1000 acpiphp_check_bridge(bridge);
1001 break;
1002
1003 case ACPI_NOTIFY_DEVICE_WAKE:
1004 /* wake event */
1005 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1006 break;
1007
1008 case ACPI_NOTIFY_EJECT_REQUEST:
1009 /* request device eject */
1010 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1011 break;
1012
1013 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1014 printk(KERN_ERR "Device %s cannot be configured due"
1015 " to a frequency mismatch\n", objname);
1016 break;
1017
1018 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1019 printk(KERN_ERR "Device %s cannot be configured due"
1020 " to a bus mode mismatch\n", objname);
1021 break;
1022
1023 case ACPI_NOTIFY_POWER_FAULT:
1024 printk(KERN_ERR "Device %s has suffered a power fault\n",
1025 objname);
1026 break;
1027
1028 default:
1029 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1030 break;
1031 }
1032}
1033
1034
1035/**
1036 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1037 *
1038 * @handle: Notify()'ed acpi_handle
1039 * @type: Notify code
1040 * @context: pointer to acpiphp_func structure
1041 *
1042 * handles ACPI event notification on slots
1043 *
1044 */
1045static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1046{
1047 struct acpiphp_func *func;
1048 char objname[64];
1049 struct acpi_buffer buffer = { .length = sizeof(objname),
1050 .pointer = objname };
1051
1052 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1053
1054 func = (struct acpiphp_func *)context;
1055
1056 switch (type) {
1057 case ACPI_NOTIFY_BUS_CHECK:
1058 /* bus re-enumerate */
1059 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1060 acpiphp_enable_slot(func->slot);
1061 break;
1062
1063 case ACPI_NOTIFY_DEVICE_CHECK:
1064 /* device check : re-enumerate from parent bus */
1065 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1066 acpiphp_check_bridge(func->slot->bridge);
1067 break;
1068
1069 case ACPI_NOTIFY_DEVICE_WAKE:
1070 /* wake event */
1071 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1072 break;
1073
1074 case ACPI_NOTIFY_EJECT_REQUEST:
1075 /* request device eject */
1076 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1077 acpiphp_disable_slot(func->slot);
1078 break;
1079
1080 default:
1081 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1082 break;
1083 }
1084}
1085
1086
1087static struct acpi_pci_driver acpi_pci_hp_driver = {
1088 .add = add_bridge,
1089 .remove = remove_bridge,
1090};
1091
1092/**
1093 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1094 *
1095 */
1096int __init acpiphp_glue_init(void)
1097{
1098 int num;
1099
1100 if (list_empty(&pci_root_buses))
1101 return -1;
1102
1103 num = acpi_pci_register_driver(&acpi_pci_hp_driver);
1104
1105 if (num <= 0)
1106 return -1;
1107
1108 return 0;
1109}
1110
1111
1112/**
1113 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1114 *
1115 * This function frees all data allocated in acpiphp_glue_init()
1116 */
1117void __exit acpiphp_glue_exit(void)
1118{
1119 struct list_head *l1, *l2, *n1, *n2;
1120 struct acpiphp_bridge *bridge;
1121 struct acpiphp_slot *slot, *next;
1122 struct acpiphp_func *func;
1123 acpi_status status;
1124
1125 list_for_each_safe (l1, n1, &bridge_list) {
1126 bridge = (struct acpiphp_bridge *)l1;
1127 slot = bridge->slots;
1128 while (slot) {
1129 next = slot->next;
1130 list_for_each_safe (l2, n2, &slot->funcs) {
1131 func = list_entry(l2, struct acpiphp_func, sibling);
1132 acpiphp_free_resource(&func->io_head);
1133 acpiphp_free_resource(&func->mem_head);
1134 acpiphp_free_resource(&func->p_mem_head);
1135 acpiphp_free_resource(&func->bus_head);
1136 status = acpi_remove_notify_handler(func->handle,
1137 ACPI_SYSTEM_NOTIFY,
1138 handle_hotplug_event_func);
1139 if (ACPI_FAILURE(status))
1140 err("failed to remove notify handler\n");
1141 kfree(func);
1142 }
1143 kfree(slot);
1144 slot = next;
1145 }
1146 status = acpi_remove_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY,
1147 handle_hotplug_event_bridge);
1148 if (ACPI_FAILURE(status))
1149 err("failed to remove notify handler\n");
1150
1151 acpiphp_free_resource(&bridge->io_head);
1152 acpiphp_free_resource(&bridge->mem_head);
1153 acpiphp_free_resource(&bridge->p_mem_head);
1154 acpiphp_free_resource(&bridge->bus_head);
1155
1156 kfree(bridge);
1157 }
1158
1159 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1160}
1161
1162
1163/**
1164 * acpiphp_get_num_slots - count number of slots in a system
1165 */
1166int __init acpiphp_get_num_slots(void)
1167{
1168 struct list_head *node;
1169 struct acpiphp_bridge *bridge;
1170 int num_slots;
1171
1172 num_slots = 0;
1173
1174 list_for_each (node, &bridge_list) {
1175 bridge = (struct acpiphp_bridge *)node;
1176 dbg("Bus%d %dslot(s)\n", bridge->bus, bridge->nr_slots);
1177 num_slots += bridge->nr_slots;
1178 }
1179
1180 dbg("Total %dslots\n", num_slots);
1181 return num_slots;
1182}
1183
1184
1185#if 0
1186/**
1187 * acpiphp_for_each_slot - call function for each slot
1188 * @fn: callback function
1189 * @data: context to be passed to callback function
1190 *
1191 */
1192static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1193{
1194 struct list_head *node;
1195 struct acpiphp_bridge *bridge;
1196 struct acpiphp_slot *slot;
1197 int retval = 0;
1198
1199 list_for_each (node, &bridge_list) {
1200 bridge = (struct acpiphp_bridge *)node;
1201 for (slot = bridge->slots; slot; slot = slot->next) {
1202 retval = fn(slot, data);
1203 if (!retval)
1204 goto err_exit;
1205 }
1206 }
1207
1208 err_exit:
1209 return retval;
1210}
1211#endif
1212
1213/* search matching slot from id */
1214struct acpiphp_slot *get_slot_from_id(int id)
1215{
1216 struct list_head *node;
1217 struct acpiphp_bridge *bridge;
1218 struct acpiphp_slot *slot;
1219
1220 list_for_each (node, &bridge_list) {
1221 bridge = (struct acpiphp_bridge *)node;
1222 for (slot = bridge->slots; slot; slot = slot->next)
1223 if (slot->id == id)
1224 return slot;
1225 }
1226
1227 /* should never happen! */
1228 err("%s: no object for id %d\n", __FUNCTION__, id);
1229 WARN_ON(1);
1230 return NULL;
1231}
1232
1233
1234/**
1235 * acpiphp_enable_slot - power on slot
1236 */
1237int acpiphp_enable_slot(struct acpiphp_slot *slot)
1238{
1239 int retval;
1240
1241 down(&slot->crit_sect);
1242
1243 /* wake up all functions */
1244 retval = power_on_slot(slot);
1245 if (retval)
1246 goto err_exit;
1247
1248 if (get_slot_status(slot) == ACPI_STA_ALL)
1249 /* configure all functions */
1250 retval = enable_device(slot);
1251
1252 err_exit:
1253 up(&slot->crit_sect);
1254 return retval;
1255}
1256
1257
1258/**
1259 * acpiphp_disable_slot - power off slot
1260 */
1261int acpiphp_disable_slot(struct acpiphp_slot *slot)
1262{
1263 int retval = 0;
1264
1265 down(&slot->crit_sect);
1266
1267 /* unconfigure all functions */
1268 retval = disable_device(slot);
1269 if (retval)
1270 goto err_exit;
1271
1272 /* power off all functions */
1273 retval = power_off_slot(slot);
1274 if (retval)
1275 goto err_exit;
1276
1277 acpiphp_resource_sort_and_combine(&slot->bridge->io_head);
1278 acpiphp_resource_sort_and_combine(&slot->bridge->mem_head);
1279 acpiphp_resource_sort_and_combine(&slot->bridge->p_mem_head);
1280 acpiphp_resource_sort_and_combine(&slot->bridge->bus_head);
1281 dbg("Available resources:\n");
1282 acpiphp_dump_resource(slot->bridge);
1283
1284 err_exit:
1285 up(&slot->crit_sect);
1286 return retval;
1287}
1288
1289
1290/*
1291 * slot enabled: 1
1292 * slot disabled: 0
1293 */
1294u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1295{
1296 unsigned int sta;
1297
1298 sta = get_slot_status(slot);
1299
1300 return (sta & ACPI_STA_ENABLED) ? 1 : 0;
1301}
1302
1303
1304/*
1305 * latch closed: 1
1306 * latch open: 0
1307 */
1308u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1309{
1310 unsigned int sta;
1311
1312 sta = get_slot_status(slot);
1313
1314 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
1315}
1316
1317
1318/*
1319 * adapter presence : 1
1320 * absence : 0
1321 */
1322u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1323{
1324 unsigned int sta;
1325
1326 sta = get_slot_status(slot);
1327
1328 return (sta == 0) ? 0 : 1;
1329}
1330
1331
1332/*
1333 * pci address (seg/bus/dev)
1334 */
1335u32 acpiphp_get_address(struct acpiphp_slot *slot)
1336{
1337 u32 address;
1338
1339 address = ((slot->bridge->seg) << 16) |
1340 ((slot->bridge->bus) << 8) |
1341 slot->device;
1342
1343 return address;
1344}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 01:17:19 -0500