2 * Copyright (c) 1997, Stefan Esser <se@kfreebsd.org>
3 * Copyright (c) 2000, Michael Smith <msmith@kfreebsd.org>
4 * Copyright (c) 2000, BSDi
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 * __FBSDID("$FreeBSD: src/sys/dev/acpica/acpi_pci.c,v 1.31.2.1.6.1 2009/04/15 03:14:26 kensmith Exp $");
30 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
42 #include <sys/pciio.h>
43 #include <bus/pci/pcireg.h>
44 #include <bus/pci/pcivar.h>
45 #include <bus/pci/pci_private.h>
50 /* Hooks for the ACPI CA debugging infrastructure. */
51 #define _COMPONENT ACPI_BUS
52 ACPI_MODULE_NAME("PCI")
54 struct acpi_pci_devinfo {
55 struct pci_devinfo ap_dinfo;
56 ACPI_HANDLE ap_handle;
60 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
62 /* Be sure that ACPI and PCI power states are equivalent. */
63 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
64 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
65 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
66 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
68 static int acpi_pci_attach(device_t dev);
69 static int acpi_pci_suspend(device_t dev);
70 static int acpi_pci_resume(device_t dev);
71 static int acpi_pci_child_location_str_method(device_t cbdev,
72 device_t child, char *buf, size_t buflen);
73 static int acpi_pci_probe(device_t dev);
74 static int acpi_pci_read_ivar(device_t dev, device_t child, int which,
76 static int acpi_pci_write_ivar(device_t dev, device_t child, int which,
78 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
79 void *context, void **status);
80 static int acpi_pci_set_powerstate_method(device_t dev, device_t child,
82 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
84 static device_method_t acpi_pci_methods[] = {
85 /* Device interface */
86 DEVMETHOD(device_probe, acpi_pci_probe),
87 DEVMETHOD(device_attach, acpi_pci_attach),
88 DEVMETHOD(device_shutdown, bus_generic_shutdown),
89 DEVMETHOD(device_suspend, acpi_pci_suspend),
90 DEVMETHOD(device_resume, acpi_pci_resume),
93 DEVMETHOD(bus_print_child, pci_print_child),
94 DEVMETHOD(bus_get_resource_list,pci_get_resource_list),
95 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
96 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
97 DEVMETHOD(bus_delete_resource, pci_delete_resource),
98 DEVMETHOD(bus_alloc_resource, pci_alloc_resource),
99 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
100 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
101 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
102 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar),
103 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar),
104 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
105 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
106 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
107 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
110 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
111 DEVMETHOD(pci_read_config, pci_read_config_method),
112 DEVMETHOD(pci_write_config, pci_write_config_method),
113 DEVMETHOD(pci_enable_busmaster, pci_enable_busmaster_method),
114 DEVMETHOD(pci_disable_busmaster, pci_disable_busmaster_method),
115 DEVMETHOD(pci_enable_io, pci_enable_io_method),
116 DEVMETHOD(pci_disable_io, pci_disable_io_method),
117 DEVMETHOD(pci_get_powerstate, pci_get_powerstate_method),
118 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
119 DEVMETHOD(pci_assign_interrupt, pci_assign_interrupt_method),
124 static driver_t acpi_pci_driver = {
130 static devclass_t pci_devclass;
132 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
133 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
134 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
135 MODULE_VERSION(acpi_pci, 1);
138 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
140 struct acpi_pci_devinfo *dinfo;
142 dinfo = device_get_ivars(child);
144 case ACPI_IVAR_HANDLE:
145 *result = (uintptr_t)dinfo->ap_handle;
147 case ACPI_IVAR_FLAGS:
148 *result = (uintptr_t)dinfo->ap_flags;
151 return (pci_read_ivar(dev, child, which, result));
155 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
157 struct acpi_pci_devinfo *dinfo;
159 dinfo = device_get_ivars(child);
161 case ACPI_IVAR_HANDLE:
162 dinfo->ap_handle = (ACPI_HANDLE)value;
164 case ACPI_IVAR_FLAGS:
165 dinfo->ap_flags = (int)value;
168 return (pci_write_ivar(dev, child, which, value));
172 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
175 struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
177 pci_child_location_str_method(cbdev, child, buf, buflen);
179 if (dinfo->ap_handle) {
180 strlcat(buf, " handle=", buflen);
181 strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
187 * PCI power manangement
190 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
194 int old_state, error;
197 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
201 * We set the state using PCI Power Management outside of setting
202 * the ACPI state. This means that when powering down a device, we
203 * first shut it down using PCI, and then using ACPI, which lets ACPI
204 * try to power down any Power Resources that are now no longer used.
205 * When powering up a device, we let ACPI set the state first so that
206 * it can enable any needed Power Resources before changing the PCI
209 ACPI_SERIAL_BEGIN(pci_powerstate);
210 old_state = pci_get_powerstate(child);
211 if (old_state < state) {
212 error = pci_set_powerstate_method(dev, child, state);
216 h = acpi_get_handle(child);
217 status = acpi_pwr_switch_consumer(h, state);
218 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
220 "Failed to set ACPI power state D%d on %s: %s\n",
221 state, acpi_name(h), AcpiFormatException(status));
222 if (old_state > state)
223 error = pci_set_powerstate_method(dev, child, state);
226 ACPI_SERIAL_END(pci_powerstate);
231 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
237 * Lookup and remove the unused device that acpi0 creates when it walks
238 * the namespace creating devices.
240 child = acpi_get_device(handle);
242 if (device_is_alive(child)) {
244 * The TabletPC TC1000 has a second PCI-ISA bridge
245 * that has a _HID for an acpi_sysresource device.
246 * In that case, leave ACPI-CA's device data pointing
247 * at the ACPI-enumerated device.
250 "Conflicts with PCI device %d:%d:%d\n",
251 pci_get_bus(pci_child), pci_get_slot(pci_child),
252 pci_get_function(pci_child));
255 KASSERT(device_get_parent(child) ==
256 devclass_get_device(devclass_find("acpi"), 0),
257 ("%s: child (%s)'s parent is not acpi0", __func__,
259 device_delete_child(device_get_parent(child), child);
263 * Update ACPI-CA to use the PCI enumerated device_t for this handle.
265 status = AcpiDetachData(handle, acpi_fake_objhandler);
266 if (ACPI_FAILURE(status))
267 kprintf("WARNING: Unable to detach object data from %s - %s\n",
268 acpi_name(handle), AcpiFormatException(status));
269 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
270 if (ACPI_FAILURE(status))
271 kprintf("WARNING: Unable to attach object data to %s - %s\n",
272 acpi_name(handle), AcpiFormatException(status));
276 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
279 struct acpi_pci_devinfo *dinfo;
281 int devcount, i, func, slot;
284 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
286 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
287 return_ACPI_STATUS (AE_OK);
288 slot = ACPI_ADR_PCI_SLOT(address);
289 func = ACPI_ADR_PCI_FUNC(address);
290 if (device_get_children((device_t)context, &devlist, &devcount) != 0)
291 return_ACPI_STATUS (AE_OK);
292 for (i = 0; i < devcount; i++) {
293 dinfo = device_get_ivars(devlist[i]);
294 if (dinfo->ap_dinfo.cfg.func == func &&
295 dinfo->ap_dinfo.cfg.slot == slot) {
296 dinfo->ap_handle = handle;
297 acpi_pci_update_device(handle, devlist[i]);
301 kfree(devlist, M_TEMP);
302 return_ACPI_STATUS (AE_OK);
306 acpi_pci_probe(device_t dev)
309 if (pcib_get_bus(dev) < 0)
311 if (acpi_get_handle(dev) == NULL)
313 device_set_desc(dev, "ACPI PCI bus");
318 acpi_pci_attach(device_t dev)
323 * Since there can be multiple independantly numbered PCI
324 * busses on systems with multiple PCI domains, we can't use
325 * the unit number to decide which bus we are probing. We ask
326 * the parent pcib what our domain and bus numbers are.
328 busno = pcib_get_bus(dev);
329 domain = pcib_get_domain(dev);
331 device_printf(dev, "domain=%d, physical bus=%d\n",
334 ACPI_SERIAL_INIT(pci_powerstate);
337 * First, PCI devices are added as in the normal PCI bus driver.
338 * Afterwards, the ACPI namespace under the bridge driver is
339 * walked to save ACPI handles to all the devices that appear in
340 * the ACPI namespace as immediate descendants of the bridge.
342 * XXX: Sometimes PCI devices show up in the ACPI namespace that
343 * pci_add_children() doesn't find. We currently just ignore
346 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
347 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
348 acpi_pci_save_handle, dev, NULL);
350 return (bus_generic_attach(dev));
354 acpi_pci_suspend(device_t dev)
356 int dstate, error, i, numdevs;
357 device_t acpi_dev, child, *devlist;
358 struct pci_devinfo *dinfo;
360 * Save the PCI configuration space for each child and set the
361 * device in the appropriate power state for this sleep state.
364 acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
365 device_get_children(dev, &devlist, &numdevs);
366 for (i = 0; i < numdevs; i++) {
368 dinfo = (struct pci_devinfo *) device_get_ivars(child);
369 pci_cfg_save(child, dinfo, 0);
371 /* Suspend devices before potentially powering them down. */
372 error = bus_generic_suspend(dev);
374 kfree(devlist, M_TEMP);
378 * Always set the device to D3. If ACPI suggests a different
379 * power state, use it instead. If ACPI is not present, the
380 * firmware is responsible for managing device power. Skip
381 * children who aren't attached since they are powered down
382 * separately. Only manage type 0 devices for now.
384 for (i = 0; acpi_dev && i < numdevs; i++) {
386 dinfo = (struct pci_devinfo *) device_get_ivars(child);
387 if (device_is_attached(child) && dinfo->cfg.hdrtype == 0) {
388 dstate = PCI_POWERSTATE_D3;
389 ACPI_PWR_FOR_SLEEP(acpi_dev, child, &dstate);
390 pci_set_powerstate(child, dstate);
393 kfree(devlist, M_TEMP);
398 acpi_pci_resume(device_t dev)
401 device_t acpi_dev, child, *devlist;
402 struct pci_devinfo *dinfo;
404 * Set each child to D0 and restore its PCI configuration space.
407 acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
408 device_get_children(dev, &devlist, &numdevs);
409 for (i = 0; i < numdevs; i++) {
411 * Notify ACPI we're going to D0 but ignore the result. If
412 * ACPI is not present, the firmware is responsible for
413 * managing device power. Only manage type 0 devices for now.
416 dinfo = (struct pci_devinfo *) device_get_ivars(child);
417 if (acpi_dev && device_is_attached(child) &&
418 dinfo->cfg.hdrtype == 0) {
419 ACPI_PWR_FOR_SLEEP(acpi_dev, child, NULL);
420 pci_set_powerstate(child, PCI_POWERSTATE_D0);
422 /* Now the device is powered up, restore its config space. */
423 pci_cfg_restore(child, dinfo);
425 kfree(devlist, M_TEMP);
426 return (bus_generic_resume(dev));