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 handle_hotplug_event_func (acpi_handle, u32, void *);
61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
66 * initialization & terminatation routines
70 * is_ejectable - determine if a slot is ejectable
71 * @handle: handle to acpi namespace
73 * Ejectable slot should satisfy at least these conditions:
86 static int is_ejectable(acpi_handle handle)
91 status = acpi_get_handle(handle, "_ADR", &tmp);
92 if (ACPI_FAILURE(status)) {
96 status = acpi_get_handle(handle, "_EJ0", &tmp);
97 if (ACPI_FAILURE(status)) {
105 /* callback routine to check the existence of ejectable slots */
107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
109 int *count = (int *)context;
111 if (is_ejectable(handle)) {
113 /* only one ejectable slot is enough */
114 return AE_CTRL_TERMINATE;
121 /* callback routine to register each ACPI PCI slot object */
123 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
125 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
126 struct acpiphp_slot *slot;
127 struct acpiphp_func *newfunc;
129 acpi_status status = AE_OK;
130 unsigned long adr, sun;
131 int device, function;
132 static int num_slots = 0; /* XXX if we support I/O node hotplug... */
134 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
136 if (ACPI_FAILURE(status))
139 status = acpi_get_handle(handle, "_EJ0", &tmp);
141 if (ACPI_FAILURE(status))
144 device = (adr >> 16) & 0xffff;
145 function = adr & 0xffff;
147 newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
150 memset(newfunc, 0, sizeof(struct acpiphp_func));
152 INIT_LIST_HEAD(&newfunc->sibling);
153 newfunc->handle = handle;
154 newfunc->function = function;
155 newfunc->flags = FUNC_HAS_EJ0;
157 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
158 newfunc->flags |= FUNC_HAS_STA;
160 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
161 newfunc->flags |= FUNC_HAS_PS0;
163 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
164 newfunc->flags |= FUNC_HAS_PS3;
166 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
167 if (ACPI_FAILURE(status))
170 /* search for objects that share the same slot */
171 for (slot = bridge->slots; slot; slot = slot->next)
172 if (slot->device == device) {
173 if (slot->sun != sun)
174 warn("sibling found, but _SUN doesn't match!\n");
179 slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
185 memset(slot, 0, sizeof(struct acpiphp_slot));
186 slot->bridge = bridge;
187 slot->id = num_slots++;
188 slot->device = device;
190 INIT_LIST_HEAD(&slot->funcs);
191 mutex_init(&slot->crit_sect);
193 slot->next = bridge->slots;
194 bridge->slots = slot;
198 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
199 slot->sun, pci_domain_nr(bridge->pci_bus),
200 bridge->pci_bus->number, slot->device);
203 newfunc->slot = slot;
204 list_add_tail(&newfunc->sibling, &slot->funcs);
206 /* associate corresponding pci_dev */
207 newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
208 PCI_DEVFN(device, function));
209 if (newfunc->pci_dev) {
210 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
213 /* install notify handler */
214 status = acpi_install_notify_handler(handle,
216 handle_hotplug_event_func,
219 if (ACPI_FAILURE(status)) {
220 err("failed to register interrupt notify handler\n");
228 /* see if it's worth looking at this bridge */
229 static int detect_ejectable_slots(acpi_handle *bridge_handle)
236 /* only check slots defined directly below bridge object */
237 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
238 is_ejectable_slot, (void *)&count, NULL);
244 /* decode ACPI 2.0 _HPP hot plug parameters */
245 static void decode_hpp(struct acpiphp_bridge *bridge)
248 struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
250 union acpi_object *package;
253 /* default numbers */
254 bridge->hpp.cache_line_size = 0x10;
255 bridge->hpp.latency_timer = 0x40;
256 bridge->hpp.enable_SERR = 0;
257 bridge->hpp.enable_PERR = 0;
259 status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
261 if (ACPI_FAILURE(status)) {
262 dbg("_HPP evaluation failed\n");
266 package = (union acpi_object *) buffer.pointer;
268 if (!package || package->type != ACPI_TYPE_PACKAGE ||
269 package->package.count != 4 || !package->package.elements) {
270 err("invalid _HPP object; ignoring\n");
274 for (i = 0; i < 4; i++) {
275 if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
276 err("invalid _HPP parameter type; ignoring\n");
281 bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
282 bridge->hpp.latency_timer = package->package.elements[1].integer.value;
283 bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
284 bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
286 dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
287 bridge->hpp.cache_line_size,
288 bridge->hpp.latency_timer,
289 bridge->hpp.enable_SERR,
290 bridge->hpp.enable_PERR);
292 bridge->flags |= BRIDGE_HAS_HPP;
295 kfree(buffer.pointer);
299 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
300 static void init_bridge_misc(struct acpiphp_bridge *bridge)
304 /* decode ACPI 2.0 _HPP (hot plug parameters) */
307 /* register all slot objects under this bridge */
308 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
309 register_slot, bridge, NULL);
311 /* install notify handler */
312 if (bridge->type != BRIDGE_TYPE_HOST) {
313 status = acpi_install_notify_handler(bridge->handle,
315 handle_hotplug_event_bridge,
318 if (ACPI_FAILURE(status)) {
319 err("failed to register interrupt notify handler\n");
323 list_add(&bridge->list, &bridge_list);
327 /* allocate and initialize host bridge data structure */
328 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
330 struct acpiphp_bridge *bridge;
332 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
336 memset(bridge, 0, sizeof(struct acpiphp_bridge));
338 bridge->type = BRIDGE_TYPE_HOST;
339 bridge->handle = handle;
341 bridge->pci_bus = pci_bus;
343 spin_lock_init(&bridge->res_lock);
345 init_bridge_misc(bridge);
349 /* allocate and initialize PCI-to-PCI bridge data structure */
350 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
352 struct acpiphp_bridge *bridge;
354 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
355 if (bridge == NULL) {
356 err("out of memory\n");
360 memset(bridge, 0, sizeof(struct acpiphp_bridge));
362 bridge->type = BRIDGE_TYPE_P2P;
363 bridge->handle = handle;
365 bridge->pci_dev = pci_dev_get(pci_dev);
366 bridge->pci_bus = pci_dev->subordinate;
367 if (!bridge->pci_bus) {
368 err("This is not a PCI-to-PCI bridge!\n");
372 spin_lock_init(&bridge->res_lock);
374 init_bridge_misc(bridge);
377 pci_dev_put(pci_dev);
383 /* callback routine to find P2P bridges */
385 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
388 acpi_handle dummy_handle;
390 int device, function;
392 struct pci_bus *pci_bus = context;
394 status = acpi_get_handle(handle, "_ADR", &dummy_handle);
395 if (ACPI_FAILURE(status))
396 return AE_OK; /* continue */
398 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
399 if (ACPI_FAILURE(status)) {
400 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
404 device = (tmp >> 16) & 0xffff;
405 function = tmp & 0xffff;
407 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
409 if (!dev || !dev->subordinate)
412 /* check if this bridge has ejectable slots */
413 if (detect_ejectable_slots(handle) > 0) {
414 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
415 add_p2p_bridge(handle, dev);
424 /* find hot-pluggable slots, and then find P2P bridge */
425 static int add_bridge(acpi_handle handle)
430 acpi_handle dummy_handle;
431 struct pci_bus *pci_bus;
433 /* if the bridge doesn't have _STA, we assume it is always there */
434 status = acpi_get_handle(handle, "_STA", &dummy_handle);
435 if (ACPI_SUCCESS(status)) {
436 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
437 if (ACPI_FAILURE(status)) {
438 dbg("%s: _STA evaluation failure\n", __FUNCTION__);
441 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
442 /* don't register this object */
446 /* get PCI segment number */
447 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
449 seg = ACPI_SUCCESS(status) ? tmp : 0;
451 /* get PCI bus number */
452 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
454 if (ACPI_SUCCESS(status)) {
457 warn("can't get bus number, assuming 0\n");
461 pci_bus = pci_find_bus(seg, bus);
463 err("Can't find bus %04x:%02x\n", seg, bus);
467 /* check if this bridge has ejectable slots */
468 if (detect_ejectable_slots(handle) > 0) {
469 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
470 add_host_bridge(handle, pci_bus);
474 /* search P2P bridges under this host bridge */
475 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
476 find_p2p_bridge, pci_bus, NULL);
478 if (ACPI_FAILURE(status))
479 warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
484 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
486 struct list_head *head;
487 list_for_each(head, &bridge_list) {
488 struct acpiphp_bridge *bridge = list_entry(head,
489 struct acpiphp_bridge, list);
490 if (bridge->handle == handle)
497 static void cleanup_bridge(struct acpiphp_bridge *bridge)
499 struct list_head *list, *tmp;
500 struct acpiphp_slot *slot;
502 acpi_handle handle = bridge->handle;
504 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
505 handle_hotplug_event_bridge);
506 if (ACPI_FAILURE(status))
507 err("failed to remove notify handler\n");
509 slot = bridge->slots;
511 struct acpiphp_slot *next = slot->next;
512 list_for_each_safe (list, tmp, &slot->funcs) {
513 struct acpiphp_func *func;
514 func = list_entry(list, struct acpiphp_func, sibling);
515 status = acpi_remove_notify_handler(func->handle,
517 handle_hotplug_event_func);
518 if (ACPI_FAILURE(status))
519 err("failed to remove notify handler\n");
520 pci_dev_put(func->pci_dev);
528 pci_dev_put(bridge->pci_dev);
529 list_del(&bridge->list);
534 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
536 struct acpiphp_bridge *bridge;
538 if (!(bridge = acpiphp_handle_to_bridge(handle)))
540 cleanup_bridge(bridge);
544 static void remove_bridge(acpi_handle handle)
546 struct acpiphp_bridge *bridge;
548 bridge = acpiphp_handle_to_bridge(handle);
550 cleanup_bridge(bridge);
552 /* clean-up p2p bridges under this host bridge */
553 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
554 (u32)1, cleanup_p2p_bridge, NULL, NULL);
558 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
560 struct acpi_pci_id id;
564 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
567 bus = pci_find_bus(id.segment, id.bus);
571 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
575 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
576 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
585 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
590 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
591 union acpi_object *obj;
594 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
595 if (ACPI_SUCCESS(status)) {
596 *gsi_base = (u32)gsb;
600 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
601 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
604 obj = buffer.pointer;
605 if (obj->type != ACPI_TYPE_BUFFER)
608 table = obj->buffer.pointer;
609 switch (((acpi_table_entry_header *)table)->type) {
610 case ACPI_MADT_IOSAPIC:
611 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
614 case ACPI_MADT_IOAPIC:
615 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
622 acpi_os_free(buffer.pointer);
627 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
632 struct pci_dev *pdev;
636 /* Evaluate _STA if present */
637 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
638 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
639 return AE_CTRL_DEPTH;
641 /* Scan only PCI bus scope */
642 status = acpi_get_handle(handle, "_HID", &tmp);
643 if (ACPI_SUCCESS(status))
644 return AE_CTRL_DEPTH;
646 if (get_gsi_base(handle, &gsi_base))
649 pdev = get_apic_pci_info(handle);
653 if (pci_enable_device(pdev)) {
658 pci_set_master(pdev);
660 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
661 pci_disable_device(pdev);
666 phys_addr = pci_resource_start(pdev, 0);
667 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
668 pci_release_region(pdev, 0);
669 pci_disable_device(pdev);
677 static int acpiphp_configure_ioapics(acpi_handle handle)
679 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
680 ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
684 static int power_on_slot(struct acpiphp_slot *slot)
687 struct acpiphp_func *func;
691 /* if already enabled, just skip */
692 if (slot->flags & SLOT_POWEREDON)
695 list_for_each (l, &slot->funcs) {
696 func = list_entry(l, struct acpiphp_func, sibling);
698 if (func->flags & FUNC_HAS_PS0) {
699 dbg("%s: executing _PS0\n", __FUNCTION__);
700 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
701 if (ACPI_FAILURE(status)) {
702 warn("%s: _PS0 failed\n", __FUNCTION__);
710 /* TBD: evaluate _STA to check if the slot is enabled */
712 slot->flags |= SLOT_POWEREDON;
719 static int power_off_slot(struct acpiphp_slot *slot)
722 struct acpiphp_func *func;
727 /* if already disabled, just skip */
728 if ((slot->flags & SLOT_POWEREDON) == 0)
731 list_for_each (l, &slot->funcs) {
732 func = list_entry(l, struct acpiphp_func, sibling);
734 if (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__);
745 /* TBD: evaluate _STA to check if the slot is disabled */
747 slot->flags &= (~SLOT_POWEREDON);
756 * acpiphp_max_busnr - return the highest reserved bus number under
758 * @bus: bus to start search with
761 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
763 struct list_head *tmp;
764 unsigned char max, n;
767 * pci_bus_max_busnr will return the highest
768 * reserved busnr for all these children.
769 * that is equivalent to the bus->subordinate
770 * value. We don't want to use the parent's
771 * bus->subordinate value because it could have
774 max = bus->secondary;
776 list_for_each(tmp, &bus->children) {
777 n = pci_bus_max_busnr(pci_bus_b(tmp));
787 * get_func - get a pointer to acpiphp_func given a slot, device
788 * @slot: slot to search
789 * @dev: pci_dev struct to match.
791 * This function will increase the reference count of pci_dev,
792 * so callers should call pci_dev_put when complete.
795 static struct acpiphp_func *
796 get_func(struct acpiphp_slot *slot, struct pci_dev *dev)
798 struct acpiphp_func *func = NULL;
799 struct pci_bus *bus = slot->bridge->pci_bus;
800 struct pci_dev *pdev;
802 list_for_each_entry(func, &slot->funcs, sibling) {
803 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device,
816 * acpiphp_bus_add - add a new bus to acpi subsystem
817 * @func: acpiphp_func of the bridge
820 static int acpiphp_bus_add(struct acpiphp_func *func)
823 struct acpi_device *device, *pdevice;
826 acpi_get_parent(func->handle, &phandle);
827 if (acpi_bus_get_device(phandle, &pdevice)) {
828 dbg("no parent device, assuming NULL\n");
831 if (acpi_bus_get_device(func->handle, &device)) {
832 ret_val = acpi_bus_add(&device, pdevice, func->handle,
833 ACPI_BUS_TYPE_DEVICE);
835 dbg("error adding bus, %x\n",
837 goto acpiphp_bus_add_out;
841 * try to start anyway. We could have failed to add
842 * simply because this bus had previously been added
843 * on another add. Don't bother with the return value
844 * we just keep going.
846 ret_val = acpi_bus_start(device);
855 * enable_device - enable, configure a slot
856 * @slot: slot to be enabled
858 * This function should be called per *physical slot*,
859 * not per each slot object in ACPI namespace.
862 static int enable_device(struct acpiphp_slot *slot)
865 struct pci_bus *bus = slot->bridge->pci_bus;
867 struct acpiphp_func *func;
871 if (slot->flags & SLOT_ENABLED)
874 /* sanity check: dev should be NULL when hot-plugged in */
875 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
877 /* This case shouldn't happen */
878 err("pci_dev structure already exists.\n");
884 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
886 err("No new device found\n");
891 max = acpiphp_max_busnr(bus);
892 for (pass = 0; pass < 2; pass++) {
893 list_for_each_entry(dev, &bus->devices, bus_list) {
894 if (PCI_SLOT(dev->devfn) != slot->device)
896 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
897 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
898 max = pci_scan_bridge(bus, dev, max, pass);
899 if (pass && dev->subordinate) {
900 pci_bus_size_bridges(dev->subordinate);
901 func = get_func(slot, dev);
903 acpiphp_bus_add(func);
904 /* side effect of get_func */
912 pci_bus_assign_resources(bus);
913 acpiphp_sanitize_bus(bus);
914 pci_enable_bridges(bus);
915 pci_bus_add_devices(bus);
916 acpiphp_set_hpp_values(DEVICE_ACPI_HANDLE(&bus->self->dev), bus);
917 acpiphp_configure_ioapics(DEVICE_ACPI_HANDLE(&bus->self->dev));
919 /* associate pci_dev to our representation */
920 list_for_each (l, &slot->funcs) {
921 func = list_entry(l, struct acpiphp_func, sibling);
922 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
926 slot->flags |= SLOT_ENABLED;
934 * disable_device - disable a slot
936 static int disable_device(struct acpiphp_slot *slot)
939 struct acpiphp_func *func;
942 /* is this slot already disabled? */
943 if (!(slot->flags & SLOT_ENABLED))
946 list_for_each (l, &slot->funcs) {
947 func = list_entry(l, struct acpiphp_func, sibling);
951 pci_remove_bus_device(func->pci_dev);
952 pci_dev_put(func->pci_dev);
953 func->pci_dev = NULL;
956 slot->flags &= (~SLOT_ENABLED);
964 * get_slot_status - get ACPI slot status
966 * if a slot has _STA for each function and if any one of them
967 * returned non-zero status, return it
969 * if a slot doesn't have _STA and if any one of its functions'
970 * configuration space is configured, return 0x0f as a _STA
974 static unsigned int get_slot_status(struct acpiphp_slot *slot)
977 unsigned long sta = 0;
980 struct acpiphp_func *func;
982 list_for_each (l, &slot->funcs) {
983 func = list_entry(l, struct acpiphp_func, sibling);
985 if (func->flags & FUNC_HAS_STA) {
986 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
987 if (ACPI_SUCCESS(status) && sta)
990 pci_bus_read_config_dword(slot->bridge->pci_bus,
991 PCI_DEVFN(slot->device,
993 PCI_VENDOR_ID, &dvid);
994 if (dvid != 0xffffffff) {
1001 return (unsigned int)sta;
1005 * acpiphp_eject_slot - physically eject the slot
1007 static int acpiphp_eject_slot(struct acpiphp_slot *slot)
1010 struct acpiphp_func *func;
1011 struct list_head *l;
1012 struct acpi_object_list arg_list;
1013 union acpi_object arg;
1015 list_for_each (l, &slot->funcs) {
1016 func = list_entry(l, struct acpiphp_func, sibling);
1018 /* We don't want to call _EJ0 on non-existing functions. */
1019 if ((func->flags & FUNC_HAS_EJ0)) {
1020 /* _EJ0 method take one argument */
1022 arg_list.pointer = &arg;
1023 arg.type = ACPI_TYPE_INTEGER;
1024 arg.integer.value = 1;
1026 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1027 if (ACPI_FAILURE(status)) {
1028 warn("%s: _EJ0 failed\n", __FUNCTION__);
1038 * acpiphp_check_bridge - re-enumerate devices
1040 * Iterate over all slots under this bridge and make sure that if a
1041 * card is present they are enabled, and if not they are disabled.
1043 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1045 struct acpiphp_slot *slot;
1047 int enabled, disabled;
1049 enabled = disabled = 0;
1051 for (slot = bridge->slots; slot; slot = slot->next) {
1052 unsigned int status = get_slot_status(slot);
1053 if (slot->flags & SLOT_ENABLED) {
1054 if (status == ACPI_STA_ALL)
1056 retval = acpiphp_disable_slot(slot);
1058 err("Error occurred in disabling\n");
1061 acpiphp_eject_slot(slot);
1065 if (status != ACPI_STA_ALL)
1067 retval = acpiphp_enable_slot(slot);
1069 err("Error occurred in enabling\n");
1076 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
1082 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1084 u16 pci_cmd, pci_bctl;
1085 struct pci_dev *cdev;
1087 /* Program hpp values for this device */
1088 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1089 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1090 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1092 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1093 bridge->hpp.cache_line_size);
1094 pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1095 bridge->hpp.latency_timer);
1096 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1097 if (bridge->hpp.enable_SERR)
1098 pci_cmd |= PCI_COMMAND_SERR;
1100 pci_cmd &= ~PCI_COMMAND_SERR;
1101 if (bridge->hpp.enable_PERR)
1102 pci_cmd |= PCI_COMMAND_PARITY;
1104 pci_cmd &= ~PCI_COMMAND_PARITY;
1105 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1107 /* Program bridge control value and child devices */
1108 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1109 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1110 bridge->hpp.latency_timer);
1111 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1112 if (bridge->hpp.enable_SERR)
1113 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1115 pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1116 if (bridge->hpp.enable_PERR)
1117 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1119 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1120 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1121 if (dev->subordinate) {
1122 list_for_each_entry(cdev, &dev->subordinate->devices,
1124 program_hpp(cdev, bridge);
1129 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1131 struct acpiphp_bridge bridge;
1132 struct pci_dev *dev;
1134 memset(&bridge, 0, sizeof(bridge));
1135 bridge.handle = handle;
1136 decode_hpp(&bridge);
1137 list_for_each_entry(dev, &bus->devices, bus_list)
1138 program_hpp(dev, &bridge);
1143 * Remove devices for which we could not assign resources, call
1144 * arch specific code to fix-up the bus
1146 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1148 struct pci_dev *dev;
1150 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1152 list_for_each_entry(dev, &bus->devices, bus_list) {
1153 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1154 struct resource *res = &dev->resource[i];
1155 if ((res->flags & type_mask) && !res->start &&
1157 /* Could not assign a required resources
1158 * for this device, remove it */
1159 pci_remove_bus_device(dev);
1166 /* Program resources in newly inserted bridge */
1167 static int acpiphp_configure_bridge (acpi_handle handle)
1169 struct acpi_pci_id pci_id;
1170 struct pci_bus *bus;
1172 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1173 err("cannot get PCI domain and bus number for bridge\n");
1176 bus = pci_find_bus(pci_id.segment, pci_id.bus);
1178 err("cannot find bus %d:%d\n",
1179 pci_id.segment, pci_id.bus);
1183 pci_bus_size_bridges(bus);
1184 pci_bus_assign_resources(bus);
1185 acpiphp_sanitize_bus(bus);
1186 acpiphp_set_hpp_values(handle, bus);
1187 pci_enable_bridges(bus);
1188 acpiphp_configure_ioapics(handle);
1192 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1194 struct acpi_device *device, *pdevice;
1195 acpi_handle phandle;
1197 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1198 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1199 err("unexpected notification type %d\n", type);
1203 acpi_get_parent(handle, &phandle);
1204 if (acpi_bus_get_device(phandle, &pdevice)) {
1205 dbg("no parent device, assuming NULL\n");
1208 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1209 err("cannot add bridge to acpi list\n");
1212 if (!acpiphp_configure_bridge(handle) &&
1213 !acpi_bus_start(device))
1216 err("cannot configure and start bridge\n");
1221 * ACPI event handlers
1225 * handle_hotplug_event_bridge - handle ACPI event on bridges
1227 * @handle: Notify()'ed acpi_handle
1228 * @type: Notify code
1229 * @context: pointer to acpiphp_bridge structure
1231 * handles ACPI event notification on {host,p2p} bridges
1234 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1236 struct acpiphp_bridge *bridge;
1238 struct acpi_buffer buffer = { .length = sizeof(objname),
1239 .pointer = objname };
1240 struct acpi_device *device;
1242 if (acpi_bus_get_device(handle, &device)) {
1243 /* This bridge must have just been physically inserted */
1244 handle_bridge_insertion(handle, type);
1248 bridge = acpiphp_handle_to_bridge(handle);
1250 err("cannot get bridge info\n");
1254 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1257 case ACPI_NOTIFY_BUS_CHECK:
1258 /* bus re-enumerate */
1259 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1260 acpiphp_check_bridge(bridge);
1263 case ACPI_NOTIFY_DEVICE_CHECK:
1265 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1266 acpiphp_check_bridge(bridge);
1269 case ACPI_NOTIFY_DEVICE_WAKE:
1271 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1274 case ACPI_NOTIFY_EJECT_REQUEST:
1275 /* request device eject */
1276 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1279 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1280 printk(KERN_ERR "Device %s cannot be configured due"
1281 " to a frequency mismatch\n", objname);
1284 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1285 printk(KERN_ERR "Device %s cannot be configured due"
1286 " to a bus mode mismatch\n", objname);
1289 case ACPI_NOTIFY_POWER_FAULT:
1290 printk(KERN_ERR "Device %s has suffered a power fault\n",
1295 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1301 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1303 * @handle: Notify()'ed acpi_handle
1304 * @type: Notify code
1305 * @context: pointer to acpiphp_func structure
1307 * handles ACPI event notification on slots
1310 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1312 struct acpiphp_func *func;
1314 struct acpi_buffer buffer = { .length = sizeof(objname),
1315 .pointer = objname };
1317 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1319 func = (struct acpiphp_func *)context;
1322 case ACPI_NOTIFY_BUS_CHECK:
1323 /* bus re-enumerate */
1324 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1325 acpiphp_enable_slot(func->slot);
1328 case ACPI_NOTIFY_DEVICE_CHECK:
1329 /* device check : re-enumerate from parent bus */
1330 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1331 acpiphp_check_bridge(func->slot->bridge);
1334 case ACPI_NOTIFY_DEVICE_WAKE:
1336 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1339 case ACPI_NOTIFY_EJECT_REQUEST:
1340 /* request device eject */
1341 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1342 if (!(acpiphp_disable_slot(func->slot)))
1343 acpiphp_eject_slot(func->slot);
1347 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1352 static int is_root_bridge(acpi_handle handle)
1355 struct acpi_device_info *info;
1356 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1359 status = acpi_get_object_info(handle, &buffer);
1360 if (ACPI_SUCCESS(status)) {
1361 info = buffer.pointer;
1362 if ((info->valid & ACPI_VALID_HID) &&
1363 !strcmp(PCI_ROOT_HID_STRING,
1364 info->hardware_id.value)) {
1365 acpi_os_free(buffer.pointer);
1368 if (info->valid & ACPI_VALID_CID) {
1369 for (i=0; i < info->compatibility_id.count; i++) {
1370 if (!strcmp(PCI_ROOT_HID_STRING,
1371 info->compatibility_id.id[i].value)) {
1372 acpi_os_free(buffer.pointer);
1382 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1384 int *count = (int *)context;
1386 if (is_root_bridge(handle)) {
1387 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1388 handle_hotplug_event_bridge, NULL);
1394 static struct acpi_pci_driver acpi_pci_hp_driver = {
1396 .remove = remove_bridge,
1400 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1403 int __init acpiphp_glue_init(void)
1407 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1408 ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1413 acpi_pci_register_driver(&acpi_pci_hp_driver);
1420 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1422 * This function frees all data allocated in acpiphp_glue_init()
1424 void __exit acpiphp_glue_exit(void)
1426 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1431 * acpiphp_get_num_slots - count number of slots in a system
1433 int __init acpiphp_get_num_slots(void)
1435 struct list_head *node;
1436 struct acpiphp_bridge *bridge;
1441 list_for_each (node, &bridge_list) {
1442 bridge = (struct acpiphp_bridge *)node;
1443 dbg("Bus %04x:%02x has %d slot%s\n",
1444 pci_domain_nr(bridge->pci_bus),
1445 bridge->pci_bus->number, bridge->nr_slots,
1446 bridge->nr_slots == 1 ? "" : "s");
1447 num_slots += bridge->nr_slots;
1450 dbg("Total %d slots\n", num_slots);
1457 * acpiphp_for_each_slot - call function for each slot
1458 * @fn: callback function
1459 * @data: context to be passed to callback function
1462 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1464 struct list_head *node;
1465 struct acpiphp_bridge *bridge;
1466 struct acpiphp_slot *slot;
1469 list_for_each (node, &bridge_list) {
1470 bridge = (struct acpiphp_bridge *)node;
1471 for (slot = bridge->slots; slot; slot = slot->next) {
1472 retval = fn(slot, data);
1483 /* search matching slot from id */
1484 struct acpiphp_slot *get_slot_from_id(int id)
1486 struct list_head *node;
1487 struct acpiphp_bridge *bridge;
1488 struct acpiphp_slot *slot;
1490 list_for_each (node, &bridge_list) {
1491 bridge = (struct acpiphp_bridge *)node;
1492 for (slot = bridge->slots; slot; slot = slot->next)
1497 /* should never happen! */
1498 err("%s: no object for id %d\n", __FUNCTION__, id);
1505 * acpiphp_enable_slot - power on slot
1507 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1511 mutex_lock(&slot->crit_sect);
1513 /* wake up all functions */
1514 retval = power_on_slot(slot);
1518 if (get_slot_status(slot) == ACPI_STA_ALL)
1519 /* configure all functions */
1520 retval = enable_device(slot);
1523 mutex_unlock(&slot->crit_sect);
1528 * acpiphp_disable_slot - power off slot
1530 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1534 mutex_lock(&slot->crit_sect);
1536 /* unconfigure all functions */
1537 retval = disable_device(slot);
1541 /* power off all functions */
1542 retval = power_off_slot(slot);
1547 mutex_unlock(&slot->crit_sect);
1556 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1558 return (slot->flags & SLOT_POWEREDON);
1566 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1570 sta = get_slot_status(slot);
1572 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
1577 * adapter presence : 1
1580 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1584 sta = get_slot_status(slot);
1586 return (sta == 0) ? 0 : 1;
1591 * pci address (seg/bus/dev)
1593 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1596 struct pci_bus *pci_bus = slot->bridge->pci_bus;
1598 address = (pci_domain_nr(pci_bus) << 16) |
1599 (pci_bus->number << 8) |