2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
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 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
12 * All rights reserved.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 * Send feedback to <t-kochi@bq.jp.nec.com>
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_func has its refcount elevated by pci_get_slot()
36 * when the driver is loaded or when an insertion event occurs. It loses
37 * a refcount when its ejected or the driver unloads.
38 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
39 * when the bridge is scanned and it loses a refcount when the bridge
43 #include <linux/init.h>
44 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/smp_lock.h>
49 #include <linux/mutex.h>
52 #include "pci_hotplug.h"
55 static LIST_HEAD(bridge_list);
57 #define MY_NAME "acpiphp_glue"
59 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
60 static void acpiphp_sanitize_bus(struct pci_bus *bus);
61 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
65 * initialization & terminatation routines
69 * is_ejectable - determine if a slot is ejectable
70 * @handle: handle to acpi namespace
72 * Ejectable slot should satisfy at least these conditions:
85 static int is_ejectable(acpi_handle handle)
90 status = acpi_get_handle(handle, "_ADR", &tmp);
91 if (ACPI_FAILURE(status)) {
95 status = acpi_get_handle(handle, "_EJ0", &tmp);
96 if (ACPI_FAILURE(status)) {
104 /* callback routine to check the existence of ejectable slots */
106 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
108 int *count = (int *)context;
110 if (is_ejectable(handle)) {
112 /* only one ejectable slot is enough */
113 return AE_CTRL_TERMINATE;
120 /* callback routine to register each ACPI PCI slot object */
122 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
124 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
125 struct acpiphp_slot *slot;
126 struct acpiphp_func *newfunc;
127 struct dependent_device *dd;
129 acpi_status status = AE_OK;
130 unsigned long adr, sun;
131 int device, function, retval;
133 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
135 if (ACPI_FAILURE(status))
138 status = acpi_get_handle(handle, "_EJ0", &tmp);
140 if (ACPI_FAILURE(status) && !(is_dependent_device(handle)))
143 device = (adr >> 16) & 0xffff;
144 function = adr & 0xffff;
146 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
150 INIT_LIST_HEAD(&newfunc->sibling);
151 newfunc->handle = handle;
152 newfunc->function = function;
153 if (ACPI_SUCCESS(status))
154 newfunc->flags = FUNC_HAS_EJ0;
156 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
157 newfunc->flags |= FUNC_HAS_STA;
159 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
160 newfunc->flags |= FUNC_HAS_PS0;
162 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
163 newfunc->flags |= FUNC_HAS_PS3;
165 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) {
166 newfunc->flags |= FUNC_HAS_DCK;
167 /* add to devices dependent on dock station,
168 * because this may actually be the dock bridge
170 dd = alloc_dependent_device(handle);
172 err("Can't allocate memory for "
173 "new dependent device!\n");
175 add_dependent_device(dd);
178 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
179 if (ACPI_FAILURE(status))
182 /* search for objects that share the same slot */
183 for (slot = bridge->slots; slot; slot = slot->next)
184 if (slot->device == device) {
185 if (slot->sun != sun)
186 warn("sibling found, but _SUN doesn't match!\n");
191 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
197 slot->bridge = bridge;
198 slot->device = device;
200 INIT_LIST_HEAD(&slot->funcs);
201 mutex_init(&slot->crit_sect);
203 slot->next = bridge->slots;
204 bridge->slots = slot;
208 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
209 slot->sun, pci_domain_nr(bridge->pci_bus),
210 bridge->pci_bus->number, slot->device);
211 retval = acpiphp_register_hotplug_slot(slot);
213 warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
218 newfunc->slot = slot;
219 list_add_tail(&newfunc->sibling, &slot->funcs);
221 /* associate corresponding pci_dev */
222 newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
223 PCI_DEVFN(device, function));
224 if (newfunc->pci_dev) {
225 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
228 /* if this is a device dependent on a dock station,
229 * associate the acpiphp_func to the dependent_device
232 if ((dd = get_dependent_device(handle))) {
233 newfunc->flags |= FUNC_IS_DD;
235 * we don't want any devices which is dependent
236 * on the dock to have it's _EJ0 method executed.
237 * because we need to run _DCK first.
239 newfunc->flags &= ~FUNC_HAS_EJ0;
241 add_pci_dependent_device(dd);
244 /* install notify handler */
245 if (!(newfunc->flags & FUNC_HAS_DCK)) {
246 status = acpi_install_notify_handler(handle,
248 handle_hotplug_event_func,
251 if (ACPI_FAILURE(status))
252 err("failed to register interrupt notify handler\n");
260 bridge->slots = slot->next;
268 /* see if it's worth looking at this bridge */
269 static int detect_ejectable_slots(acpi_handle *bridge_handle)
276 /* only check slots defined directly below bridge object */
277 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
278 is_ejectable_slot, (void *)&count, NULL);
284 /* decode ACPI 2.0 _HPP hot plug parameters */
285 static void decode_hpp(struct acpiphp_bridge *bridge)
289 status = acpi_get_hp_params_from_firmware(bridge->pci_dev, &bridge->hpp);
290 if (ACPI_FAILURE(status)) {
291 /* use default numbers */
292 bridge->hpp.cache_line_size = 0x10;
293 bridge->hpp.latency_timer = 0x40;
294 bridge->hpp.enable_serr = 0;
295 bridge->hpp.enable_perr = 0;
301 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
302 static void init_bridge_misc(struct acpiphp_bridge *bridge)
306 /* decode ACPI 2.0 _HPP (hot plug parameters) */
309 /* must be added to the list prior to calling register_slot */
310 list_add(&bridge->list, &bridge_list);
312 /* register all slot objects under this bridge */
313 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
314 register_slot, bridge, NULL);
315 if (ACPI_FAILURE(status)) {
316 list_del(&bridge->list);
320 /* install notify handler */
321 if (bridge->type != BRIDGE_TYPE_HOST) {
322 status = acpi_install_notify_handler(bridge->handle,
324 handle_hotplug_event_bridge,
327 if (ACPI_FAILURE(status)) {
328 err("failed to register interrupt notify handler\n");
334 /* allocate and initialize host bridge data structure */
335 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
337 struct acpiphp_bridge *bridge;
339 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
343 bridge->type = BRIDGE_TYPE_HOST;
344 bridge->handle = handle;
346 bridge->pci_bus = pci_bus;
348 spin_lock_init(&bridge->res_lock);
350 init_bridge_misc(bridge);
354 /* allocate and initialize PCI-to-PCI bridge data structure */
355 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
357 struct acpiphp_bridge *bridge;
359 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
360 if (bridge == NULL) {
361 err("out of memory\n");
365 bridge->type = BRIDGE_TYPE_P2P;
366 bridge->handle = handle;
368 bridge->pci_dev = pci_dev_get(pci_dev);
369 bridge->pci_bus = pci_dev->subordinate;
370 if (!bridge->pci_bus) {
371 err("This is not a PCI-to-PCI bridge!\n");
375 spin_lock_init(&bridge->res_lock);
377 init_bridge_misc(bridge);
380 pci_dev_put(pci_dev);
386 /* callback routine to find P2P bridges */
388 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
391 acpi_handle dummy_handle;
393 int device, function;
395 struct pci_bus *pci_bus = context;
397 status = acpi_get_handle(handle, "_ADR", &dummy_handle);
398 if (ACPI_FAILURE(status))
399 return AE_OK; /* continue */
401 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
402 if (ACPI_FAILURE(status)) {
403 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
407 device = (tmp >> 16) & 0xffff;
408 function = tmp & 0xffff;
410 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
412 if (!dev || !dev->subordinate)
415 /* check if this bridge has ejectable slots */
416 if ((detect_ejectable_slots(handle) > 0) ||
417 (detect_dependent_devices(handle) > 0)) {
418 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
419 add_p2p_bridge(handle, dev);
422 /* search P2P bridges under this p2p bridge */
423 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
424 find_p2p_bridge, dev->subordinate, NULL);
425 if (ACPI_FAILURE(status))
426 warn("find_p2p_bridge faied (error code = 0x%x)\n", status);
434 /* find hot-pluggable slots, and then find P2P bridge */
435 static int add_bridge(acpi_handle handle)
440 acpi_handle dummy_handle;
441 struct pci_bus *pci_bus;
443 /* if the bridge doesn't have _STA, we assume it is always there */
444 status = acpi_get_handle(handle, "_STA", &dummy_handle);
445 if (ACPI_SUCCESS(status)) {
446 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
447 if (ACPI_FAILURE(status)) {
448 dbg("%s: _STA evaluation failure\n", __FUNCTION__);
451 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
452 /* don't register this object */
456 /* get PCI segment number */
457 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
459 seg = ACPI_SUCCESS(status) ? tmp : 0;
461 /* get PCI bus number */
462 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
464 if (ACPI_SUCCESS(status)) {
467 warn("can't get bus number, assuming 0\n");
471 pci_bus = pci_find_bus(seg, bus);
473 err("Can't find bus %04x:%02x\n", seg, bus);
477 /* check if this bridge has ejectable slots */
478 if (detect_ejectable_slots(handle) > 0) {
479 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
480 add_host_bridge(handle, pci_bus);
484 /* search P2P bridges under this host bridge */
485 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
486 find_p2p_bridge, pci_bus, NULL);
488 if (ACPI_FAILURE(status))
489 warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
494 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
496 struct list_head *head;
497 list_for_each(head, &bridge_list) {
498 struct acpiphp_bridge *bridge = list_entry(head,
499 struct acpiphp_bridge, list);
500 if (bridge->handle == handle)
507 static void cleanup_bridge(struct acpiphp_bridge *bridge)
509 struct list_head *list, *tmp;
510 struct acpiphp_slot *slot;
512 acpi_handle handle = bridge->handle;
514 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
515 handle_hotplug_event_bridge);
516 if (ACPI_FAILURE(status))
517 err("failed to remove notify handler\n");
519 slot = bridge->slots;
521 struct acpiphp_slot *next = slot->next;
522 list_for_each_safe (list, tmp, &slot->funcs) {
523 struct acpiphp_func *func;
524 func = list_entry(list, struct acpiphp_func, sibling);
525 if (!(func->flags & FUNC_HAS_DCK)) {
526 status = acpi_remove_notify_handler(func->handle,
528 handle_hotplug_event_func);
529 if (ACPI_FAILURE(status))
530 err("failed to remove notify handler\n");
532 pci_dev_put(func->pci_dev);
536 acpiphp_unregister_hotplug_slot(slot);
537 list_del(&slot->funcs);
542 pci_dev_put(bridge->pci_dev);
543 list_del(&bridge->list);
548 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
550 struct acpiphp_bridge *bridge;
552 if (!(bridge = acpiphp_handle_to_bridge(handle)))
554 cleanup_bridge(bridge);
558 static void remove_bridge(acpi_handle handle)
560 struct acpiphp_bridge *bridge;
562 bridge = acpiphp_handle_to_bridge(handle);
564 cleanup_bridge(bridge);
566 /* clean-up p2p bridges under this host bridge */
567 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
568 ACPI_UINT32_MAX, cleanup_p2p_bridge,
573 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
575 struct acpi_pci_id id;
579 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
582 bus = pci_find_bus(id.segment, id.bus);
586 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
590 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
591 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
600 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
605 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
606 union acpi_object *obj;
609 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
610 if (ACPI_SUCCESS(status)) {
611 *gsi_base = (u32)gsb;
615 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
616 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
619 obj = buffer.pointer;
620 if (obj->type != ACPI_TYPE_BUFFER)
623 table = obj->buffer.pointer;
624 switch (((acpi_table_entry_header *)table)->type) {
625 case ACPI_MADT_IOSAPIC:
626 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
629 case ACPI_MADT_IOAPIC:
630 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
637 acpi_os_free(buffer.pointer);
642 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
647 struct pci_dev *pdev;
651 /* Evaluate _STA if present */
652 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
653 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
654 return AE_CTRL_DEPTH;
656 /* Scan only PCI bus scope */
657 status = acpi_get_handle(handle, "_HID", &tmp);
658 if (ACPI_SUCCESS(status))
659 return AE_CTRL_DEPTH;
661 if (get_gsi_base(handle, &gsi_base))
664 pdev = get_apic_pci_info(handle);
668 if (pci_enable_device(pdev)) {
673 pci_set_master(pdev);
675 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
676 pci_disable_device(pdev);
681 phys_addr = pci_resource_start(pdev, 0);
682 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
683 pci_release_region(pdev, 0);
684 pci_disable_device(pdev);
692 static int acpiphp_configure_ioapics(acpi_handle handle)
694 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
695 ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
699 static int power_on_slot(struct acpiphp_slot *slot)
702 struct acpiphp_func *func;
706 /* if already enabled, just skip */
707 if (slot->flags & SLOT_POWEREDON)
710 list_for_each (l, &slot->funcs) {
711 func = list_entry(l, struct acpiphp_func, sibling);
713 if (func->flags & FUNC_HAS_PS0) {
714 dbg("%s: executing _PS0\n", __FUNCTION__);
715 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
716 if (ACPI_FAILURE(status)) {
717 warn("%s: _PS0 failed\n", __FUNCTION__);
725 /* TBD: evaluate _STA to check if the slot is enabled */
727 slot->flags |= SLOT_POWEREDON;
734 static int power_off_slot(struct acpiphp_slot *slot)
737 struct acpiphp_func *func;
742 /* if already disabled, just skip */
743 if ((slot->flags & SLOT_POWEREDON) == 0)
746 list_for_each (l, &slot->funcs) {
747 func = list_entry(l, struct acpiphp_func, sibling);
749 if (func->flags & FUNC_HAS_PS3) {
750 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
751 if (ACPI_FAILURE(status)) {
752 warn("%s: _PS3 failed\n", __FUNCTION__);
760 /* TBD: evaluate _STA to check if the slot is disabled */
762 slot->flags &= (~SLOT_POWEREDON);
771 * acpiphp_max_busnr - return the highest reserved bus number under
773 * @bus: bus to start search with
776 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
778 struct list_head *tmp;
779 unsigned char max, n;
782 * pci_bus_max_busnr will return the highest
783 * reserved busnr for all these children.
784 * that is equivalent to the bus->subordinate
785 * value. We don't want to use the parent's
786 * bus->subordinate value because it could have
789 max = bus->secondary;
791 list_for_each(tmp, &bus->children) {
792 n = pci_bus_max_busnr(pci_bus_b(tmp));
801 * acpiphp_bus_add - add a new bus to acpi subsystem
802 * @func: acpiphp_func of the bridge
805 static int acpiphp_bus_add(struct acpiphp_func *func)
808 struct acpi_device *device, *pdevice;
811 acpi_get_parent(func->handle, &phandle);
812 if (acpi_bus_get_device(phandle, &pdevice)) {
813 dbg("no parent device, assuming NULL\n");
816 if (!acpi_bus_get_device(func->handle, &device)) {
817 dbg("bus exists... trim\n");
818 /* this shouldn't be in here, so remove
819 * the bus then re-add it...
821 ret_val = acpi_bus_trim(device, 1);
822 dbg("acpi_bus_trim return %x\n", ret_val);
825 ret_val = acpi_bus_add(&device, pdevice, func->handle,
826 ACPI_BUS_TYPE_DEVICE);
828 dbg("error adding bus, %x\n",
830 goto acpiphp_bus_add_out;
833 * try to start anyway. We could have failed to add
834 * simply because this bus had previously been added
835 * on another add. Don't bother with the return value
836 * we just keep going.
838 ret_val = acpi_bus_start(device);
846 * acpiphp_bus_trim - trim a bus from acpi subsystem
847 * @handle: handle to acpi namespace
850 int acpiphp_bus_trim(acpi_handle handle)
852 struct acpi_device *device;
855 retval = acpi_bus_get_device(handle, &device);
857 dbg("acpi_device not found\n");
861 retval = acpi_bus_trim(device, 1);
863 err("cannot remove from acpi list\n");
869 * enable_device - enable, configure a slot
870 * @slot: slot to be enabled
872 * This function should be called per *physical slot*,
873 * not per each slot object in ACPI namespace.
876 static int enable_device(struct acpiphp_slot *slot)
879 struct pci_bus *bus = slot->bridge->pci_bus;
881 struct acpiphp_func *func;
885 if (slot->flags & SLOT_ENABLED)
888 /* sanity check: dev should be NULL when hot-plugged in */
889 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
891 /* This case shouldn't happen */
892 err("pci_dev structure already exists.\n");
898 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
900 err("No new device found\n");
905 max = acpiphp_max_busnr(bus);
906 for (pass = 0; pass < 2; pass++) {
907 list_for_each_entry(dev, &bus->devices, bus_list) {
908 if (PCI_SLOT(dev->devfn) != slot->device)
910 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
911 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
912 max = pci_scan_bridge(bus, dev, max, pass);
913 if (pass && dev->subordinate)
914 pci_bus_size_bridges(dev->subordinate);
919 list_for_each (l, &slot->funcs) {
920 func = list_entry(l, struct acpiphp_func, sibling);
921 acpiphp_bus_add(func);
924 pci_bus_assign_resources(bus);
925 acpiphp_sanitize_bus(bus);
926 pci_enable_bridges(bus);
927 pci_bus_add_devices(bus);
928 acpiphp_set_hpp_values(slot->bridge->handle, bus);
929 acpiphp_configure_ioapics(slot->bridge->handle);
931 /* associate pci_dev to our representation */
932 list_for_each (l, &slot->funcs) {
933 func = list_entry(l, struct acpiphp_func, sibling);
934 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
938 slot->flags |= SLOT_ENABLED;
946 * disable_device - disable a slot
948 static int disable_device(struct acpiphp_slot *slot)
951 struct acpiphp_func *func;
954 /* is this slot already disabled? */
955 if (!(slot->flags & SLOT_ENABLED))
958 list_for_each (l, &slot->funcs) {
959 func = list_entry(l, struct acpiphp_func, sibling);
961 acpiphp_bus_trim(func->handle);
962 /* try to remove anyway.
963 * acpiphp_bus_add might have been failed */
968 pci_remove_bus_device(func->pci_dev);
969 pci_dev_put(func->pci_dev);
970 func->pci_dev = NULL;
973 slot->flags &= (~SLOT_ENABLED);
981 * get_slot_status - get ACPI slot status
983 * if a slot has _STA for each function and if any one of them
984 * returned non-zero status, return it
986 * if a slot doesn't have _STA and if any one of its functions'
987 * configuration space is configured, return 0x0f as a _STA
991 static unsigned int get_slot_status(struct acpiphp_slot *slot)
994 unsigned long sta = 0;
997 struct acpiphp_func *func;
999 list_for_each (l, &slot->funcs) {
1000 func = list_entry(l, struct acpiphp_func, sibling);
1002 if (func->flags & FUNC_HAS_STA) {
1003 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1004 if (ACPI_SUCCESS(status) && sta)
1007 pci_bus_read_config_dword(slot->bridge->pci_bus,
1008 PCI_DEVFN(slot->device,
1010 PCI_VENDOR_ID, &dvid);
1011 if (dvid != 0xffffffff) {
1018 return (unsigned int)sta;
1022 * acpiphp_eject_slot - physically eject the slot
1024 static int acpiphp_eject_slot(struct acpiphp_slot *slot)
1027 struct acpiphp_func *func;
1028 struct list_head *l;
1029 struct acpi_object_list arg_list;
1030 union acpi_object arg;
1032 list_for_each (l, &slot->funcs) {
1033 func = list_entry(l, struct acpiphp_func, sibling);
1035 /* We don't want to call _EJ0 on non-existing functions. */
1036 if ((func->flags & FUNC_HAS_EJ0)) {
1037 /* _EJ0 method take one argument */
1039 arg_list.pointer = &arg;
1040 arg.type = ACPI_TYPE_INTEGER;
1041 arg.integer.value = 1;
1043 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1044 if (ACPI_FAILURE(status)) {
1045 warn("%s: _EJ0 failed\n", __FUNCTION__);
1055 * acpiphp_check_bridge - re-enumerate devices
1057 * Iterate over all slots under this bridge and make sure that if a
1058 * card is present they are enabled, and if not they are disabled.
1060 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1062 struct acpiphp_slot *slot;
1064 int enabled, disabled;
1066 enabled = disabled = 0;
1068 for (slot = bridge->slots; slot; slot = slot->next) {
1069 unsigned int status = get_slot_status(slot);
1070 if (slot->flags & SLOT_ENABLED) {
1071 if (status == ACPI_STA_ALL)
1073 retval = acpiphp_disable_slot(slot);
1075 err("Error occurred in disabling\n");
1078 acpiphp_eject_slot(slot);
1082 if (status != ACPI_STA_ALL)
1084 retval = acpiphp_enable_slot(slot);
1086 err("Error occurred in enabling\n");
1093 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
1099 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1101 u16 pci_cmd, pci_bctl;
1102 struct pci_dev *cdev;
1104 /* Program hpp values for this device */
1105 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1106 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1107 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1109 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1110 bridge->hpp.cache_line_size);
1111 pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1112 bridge->hpp.latency_timer);
1113 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1114 if (bridge->hpp.enable_serr)
1115 pci_cmd |= PCI_COMMAND_SERR;
1117 pci_cmd &= ~PCI_COMMAND_SERR;
1118 if (bridge->hpp.enable_perr)
1119 pci_cmd |= PCI_COMMAND_PARITY;
1121 pci_cmd &= ~PCI_COMMAND_PARITY;
1122 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1124 /* Program bridge control value and child devices */
1125 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1126 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1127 bridge->hpp.latency_timer);
1128 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1129 if (bridge->hpp.enable_serr)
1130 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1132 pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1133 if (bridge->hpp.enable_perr)
1134 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1136 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1137 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1138 if (dev->subordinate) {
1139 list_for_each_entry(cdev, &dev->subordinate->devices,
1141 program_hpp(cdev, bridge);
1146 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1148 struct acpiphp_bridge bridge;
1149 struct pci_dev *dev;
1151 memset(&bridge, 0, sizeof(bridge));
1152 bridge.handle = handle;
1153 bridge.pci_dev = bus->self;
1154 decode_hpp(&bridge);
1155 list_for_each_entry(dev, &bus->devices, bus_list)
1156 program_hpp(dev, &bridge);
1161 * Remove devices for which we could not assign resources, call
1162 * arch specific code to fix-up the bus
1164 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1166 struct pci_dev *dev;
1168 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1170 list_for_each_entry(dev, &bus->devices, bus_list) {
1171 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1172 struct resource *res = &dev->resource[i];
1173 if ((res->flags & type_mask) && !res->start &&
1175 /* Could not assign a required resources
1176 * for this device, remove it */
1177 pci_remove_bus_device(dev);
1184 /* Program resources in newly inserted bridge */
1185 static int acpiphp_configure_bridge (acpi_handle handle)
1187 struct acpi_pci_id pci_id;
1188 struct pci_bus *bus;
1190 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1191 err("cannot get PCI domain and bus number for bridge\n");
1194 bus = pci_find_bus(pci_id.segment, pci_id.bus);
1196 err("cannot find bus %d:%d\n",
1197 pci_id.segment, pci_id.bus);
1201 pci_bus_size_bridges(bus);
1202 pci_bus_assign_resources(bus);
1203 acpiphp_sanitize_bus(bus);
1204 acpiphp_set_hpp_values(handle, bus);
1205 pci_enable_bridges(bus);
1206 acpiphp_configure_ioapics(handle);
1210 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1212 struct acpi_device *device, *pdevice;
1213 acpi_handle phandle;
1215 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1216 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1217 err("unexpected notification type %d\n", type);
1221 acpi_get_parent(handle, &phandle);
1222 if (acpi_bus_get_device(phandle, &pdevice)) {
1223 dbg("no parent device, assuming NULL\n");
1226 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1227 err("cannot add bridge to acpi list\n");
1230 if (!acpiphp_configure_bridge(handle) &&
1231 !acpi_bus_start(device))
1234 err("cannot configure and start bridge\n");
1239 * ACPI event handlers
1243 * handle_hotplug_event_bridge - handle ACPI event on bridges
1245 * @handle: Notify()'ed acpi_handle
1246 * @type: Notify code
1247 * @context: pointer to acpiphp_bridge structure
1249 * handles ACPI event notification on {host,p2p} bridges
1252 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1254 struct acpiphp_bridge *bridge;
1256 struct acpi_buffer buffer = { .length = sizeof(objname),
1257 .pointer = objname };
1258 struct acpi_device *device;
1260 if (acpi_bus_get_device(handle, &device)) {
1261 /* This bridge must have just been physically inserted */
1262 handle_bridge_insertion(handle, type);
1266 bridge = acpiphp_handle_to_bridge(handle);
1268 err("cannot get bridge info\n");
1272 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1275 case ACPI_NOTIFY_BUS_CHECK:
1276 /* bus re-enumerate */
1277 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1278 acpiphp_check_bridge(bridge);
1281 case ACPI_NOTIFY_DEVICE_CHECK:
1283 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1284 acpiphp_check_bridge(bridge);
1287 case ACPI_NOTIFY_DEVICE_WAKE:
1289 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1292 case ACPI_NOTIFY_EJECT_REQUEST:
1293 /* request device eject */
1294 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1297 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1298 printk(KERN_ERR "Device %s cannot be configured due"
1299 " to a frequency mismatch\n", objname);
1302 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1303 printk(KERN_ERR "Device %s cannot be configured due"
1304 " to a bus mode mismatch\n", objname);
1307 case ACPI_NOTIFY_POWER_FAULT:
1308 printk(KERN_ERR "Device %s has suffered a power fault\n",
1313 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1319 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1321 * @handle: Notify()'ed acpi_handle
1322 * @type: Notify code
1323 * @context: pointer to acpiphp_func structure
1325 * handles ACPI event notification on slots
1328 void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1330 struct acpiphp_func *func;
1332 struct acpi_buffer buffer = { .length = sizeof(objname),
1333 .pointer = objname };
1335 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1337 func = (struct acpiphp_func *)context;
1340 case ACPI_NOTIFY_BUS_CHECK:
1341 /* bus re-enumerate */
1342 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1343 acpiphp_enable_slot(func->slot);
1346 case ACPI_NOTIFY_DEVICE_CHECK:
1347 /* device check : re-enumerate from parent bus */
1348 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1349 acpiphp_check_bridge(func->slot->bridge);
1352 case ACPI_NOTIFY_DEVICE_WAKE:
1354 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1357 case ACPI_NOTIFY_EJECT_REQUEST:
1358 /* request device eject */
1359 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1360 if (!(acpiphp_disable_slot(func->slot)))
1361 acpiphp_eject_slot(func->slot);
1365 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1372 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1374 int *count = (int *)context;
1376 if (acpi_root_bridge(handle)) {
1377 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1378 handle_hotplug_event_bridge, NULL);
1384 static struct acpi_pci_driver acpi_pci_hp_driver = {
1386 .remove = remove_bridge,
1390 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1393 int __init acpiphp_glue_init(void)
1397 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1398 ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1403 acpi_pci_register_driver(&acpi_pci_hp_driver);
1410 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1412 * This function frees all data allocated in acpiphp_glue_init()
1414 void __exit acpiphp_glue_exit(void)
1416 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1421 * acpiphp_get_num_slots - count number of slots in a system
1423 int __init acpiphp_get_num_slots(void)
1425 struct list_head *node;
1426 struct acpiphp_bridge *bridge;
1431 list_for_each (node, &bridge_list) {
1432 bridge = (struct acpiphp_bridge *)node;
1433 dbg("Bus %04x:%02x has %d slot%s\n",
1434 pci_domain_nr(bridge->pci_bus),
1435 bridge->pci_bus->number, bridge->nr_slots,
1436 bridge->nr_slots == 1 ? "" : "s");
1437 num_slots += bridge->nr_slots;
1440 dbg("Total %d slots\n", num_slots);
1447 * acpiphp_for_each_slot - call function for each slot
1448 * @fn: callback function
1449 * @data: context to be passed to callback function
1452 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1454 struct list_head *node;
1455 struct acpiphp_bridge *bridge;
1456 struct acpiphp_slot *slot;
1459 list_for_each (node, &bridge_list) {
1460 bridge = (struct acpiphp_bridge *)node;
1461 for (slot = bridge->slots; slot; slot = slot->next) {
1462 retval = fn(slot, data);
1475 * acpiphp_enable_slot - power on slot
1477 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1481 mutex_lock(&slot->crit_sect);
1483 /* wake up all functions */
1484 retval = power_on_slot(slot);
1488 if (get_slot_status(slot) == ACPI_STA_ALL)
1489 /* configure all functions */
1490 retval = enable_device(slot);
1493 mutex_unlock(&slot->crit_sect);
1498 * acpiphp_disable_slot - power off slot
1500 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1504 mutex_lock(&slot->crit_sect);
1506 /* unconfigure all functions */
1507 retval = disable_device(slot);
1511 /* power off all functions */
1512 retval = power_off_slot(slot);
1517 mutex_unlock(&slot->crit_sect);
1526 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1528 return (slot->flags & SLOT_POWEREDON);
1536 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1540 sta = get_slot_status(slot);
1542 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
1547 * adapter presence : 1
1550 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1554 sta = get_slot_status(slot);
1556 return (sta == 0) ? 0 : 1;
1561 * pci address (seg/bus/dev)
1563 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1566 struct pci_bus *pci_bus = slot->bridge->pci_bus;
1568 address = (pci_domain_nr(pci_bus) << 16) |
1569 (pci_bus->number << 8) |