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.
28 * $FreeBSD: src/sys/dev/acpica/acpi_pci.c,v 1.31.2.1.6.1 2009/04/15 03:14:26 kensmith Exp $
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
41 #include <sys/pciio.h>
42 #include <bus/pci/pcireg.h>
43 #include <bus/pci/pcivar.h>
44 #include <bus/pci/pci_private.h>
49 /* Hooks for the ACPI CA debugging infrastructure. */
50 #define _COMPONENT ACPI_BUS
51 ACPI_MODULE_NAME("PCI")
53 struct acpi_pci_devinfo {
54 struct pci_devinfo ap_dinfo;
55 ACPI_HANDLE ap_handle;
59 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
61 /* Be sure that ACPI and PCI power states are equivalent. */
62 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
63 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
64 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
65 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
67 static int acpi_pci_attach(device_t dev);
68 static int acpi_pci_suspend(device_t dev);
69 static int acpi_pci_resume(device_t dev);
70 static int acpi_pci_child_location_str_method(device_t cbdev,
71 device_t child, char *buf, size_t buflen);
72 static int acpi_pci_probe(device_t dev);
73 static int acpi_pci_read_ivar(device_t dev, device_t child, int which,
75 static int acpi_pci_write_ivar(device_t dev, device_t child, int which,
77 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
78 void *context, void **status);
79 static int acpi_pci_set_powerstate_method(device_t dev, device_t child,
81 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
83 static device_method_t acpi_pci_methods[] = {
84 /* Device interface */
85 DEVMETHOD(device_probe, acpi_pci_probe),
86 DEVMETHOD(device_attach, acpi_pci_attach),
87 DEVMETHOD(device_shutdown, bus_generic_shutdown),
88 DEVMETHOD(device_suspend, acpi_pci_suspend),
89 DEVMETHOD(device_resume, acpi_pci_resume),
92 DEVMETHOD(bus_print_child, pci_print_child),
93 DEVMETHOD(bus_get_resource_list,pci_get_resource_list),
94 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
95 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
96 DEVMETHOD(bus_delete_resource, pci_delete_resource),
97 DEVMETHOD(bus_alloc_resource, pci_alloc_resource),
98 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
99 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
100 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
101 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar),
102 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar),
103 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
104 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
105 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
106 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
109 DEVMETHOD(pci_read_config, pci_read_config_method),
110 DEVMETHOD(pci_write_config, pci_write_config_method),
111 DEVMETHOD(pci_enable_busmaster, pci_enable_busmaster_method),
112 DEVMETHOD(pci_disable_busmaster, pci_disable_busmaster_method),
113 DEVMETHOD(pci_enable_io, pci_enable_io_method),
114 DEVMETHOD(pci_disable_io, pci_disable_io_method),
115 DEVMETHOD(pci_get_powerstate, pci_get_powerstate_method),
116 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
117 DEVMETHOD(pci_assign_interrupt, pci_assign_interrupt_method),
122 static driver_t acpi_pci_driver = {
128 static devclass_t pci_devclass;
130 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
131 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
132 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
133 MODULE_VERSION(acpi_pci, 1);
136 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
138 struct acpi_pci_devinfo *dinfo;
140 dinfo = device_get_ivars(child);
142 case ACPI_IVAR_HANDLE:
143 *result = (uintptr_t)dinfo->ap_handle;
145 case ACPI_IVAR_FLAGS:
146 *result = (uintptr_t)dinfo->ap_flags;
149 return (pci_read_ivar(dev, child, which, result));
153 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
155 struct acpi_pci_devinfo *dinfo;
157 dinfo = device_get_ivars(child);
159 case ACPI_IVAR_HANDLE:
160 dinfo->ap_handle = (ACPI_HANDLE)value;
162 case ACPI_IVAR_FLAGS:
163 dinfo->ap_flags = (int)value;
166 return (pci_write_ivar(dev, child, which, value));
170 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
173 struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
175 pci_child_location_str_method(cbdev, child, buf, buflen);
177 if (dinfo->ap_handle) {
178 strlcat(buf, " handle=", buflen);
179 strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
185 * PCI power manangement
188 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
192 int old_state, error;
195 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
199 * We set the state using PCI Power Management outside of setting
200 * the ACPI state. This means that when powering down a device, we
201 * first shut it down using PCI, and then using ACPI, which lets ACPI
202 * try to power down any Power Resources that are now no longer used.
203 * When powering up a device, we let ACPI set the state first so that
204 * it can enable any needed Power Resources before changing the PCI
207 ACPI_SERIAL_BEGIN(pci_powerstate);
208 old_state = pci_get_powerstate(child);
209 if (old_state < state) {
210 error = pci_set_powerstate_method(dev, child, state);
214 h = acpi_get_handle(child);
215 status = acpi_pwr_switch_consumer(h, state);
216 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
218 "Failed to set ACPI power state D%d on %s: %s\n",
219 state, acpi_name(h), AcpiFormatException(status));
220 if (old_state > state)
221 error = pci_set_powerstate_method(dev, child, state);
224 ACPI_SERIAL_END(pci_powerstate);
229 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
235 * Lookup and remove the unused device that acpi0 creates when it walks
236 * the namespace creating devices.
238 child = acpi_get_device(handle);
240 if (device_is_alive(child)) {
242 * The TabletPC TC1000 has a second PCI-ISA bridge
243 * that has a _HID for an acpi_sysresource device.
244 * In that case, leave ACPI-CA's device data pointing
245 * at the ACPI-enumerated device.
248 "Conflicts with PCI device %d:%d:%d\n",
249 pci_get_bus(pci_child), pci_get_slot(pci_child),
250 pci_get_function(pci_child));
253 KASSERT(device_get_parent(child) ==
254 devclass_get_device(devclass_find("acpi"), 0),
255 ("%s: child (%s)'s parent is not acpi0", __func__,
257 device_delete_child(device_get_parent(child), child);
261 * Update ACPI-CA to use the PCI enumerated device_t for this handle.
263 status = AcpiDetachData(handle, acpi_fake_objhandler);
264 if (ACPI_FAILURE(status))
265 kprintf("WARNING: Unable to detach object data from %s - %s\n",
266 acpi_name(handle), AcpiFormatException(status));
267 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
268 if (ACPI_FAILURE(status))
269 kprintf("WARNING: Unable to attach object data to %s - %s\n",
270 acpi_name(handle), AcpiFormatException(status));
274 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
277 struct acpi_pci_devinfo *dinfo;
279 int devcount, i, func, slot;
282 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
284 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
285 return_ACPI_STATUS (AE_OK);
286 slot = ACPI_ADR_PCI_SLOT(address);
287 func = ACPI_ADR_PCI_FUNC(address);
288 if (device_get_children((device_t)context, &devlist, &devcount) != 0)
289 return_ACPI_STATUS (AE_OK);
290 for (i = 0; i < devcount; i++) {
291 dinfo = device_get_ivars(devlist[i]);
292 if (dinfo->ap_dinfo.cfg.func == func &&
293 dinfo->ap_dinfo.cfg.slot == slot) {
294 dinfo->ap_handle = handle;
295 acpi_pci_update_device(handle, devlist[i]);
299 kfree(devlist, M_TEMP);
300 return_ACPI_STATUS (AE_OK);
304 acpi_pci_probe(device_t dev)
307 if (pcib_get_bus(dev) < 0)
309 if (acpi_get_handle(dev) == NULL)
311 device_set_desc(dev, "ACPI PCI bus");
316 acpi_pci_attach(device_t dev)
321 * Since there can be multiple independantly numbered PCI
322 * busses on systems with multiple PCI domains, we can't use
323 * the unit number to decide which bus we are probing. We ask
324 * the parent pcib what our domain and bus numbers are.
326 busno = pcib_get_bus(dev);
327 domain = pcib_get_domain(dev);
329 device_printf(dev, "domain=%d, physical bus=%d\n",
333 ACPI_SERIAL_INIT(pci_powerstate);
336 * First, PCI devices are added as in the normal PCI bus driver.
337 * Afterwards, the ACPI namespace under the bridge driver is
338 * walked to save ACPI handles to all the devices that appear in
339 * the ACPI namespace as immediate descendants of the bridge.
341 * XXX: Sometimes PCI devices show up in the ACPI namespace that
342 * pci_add_children() doesn't find. We currently just ignore
345 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
346 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
347 NULL, acpi_pci_save_handle, dev, NULL);
349 return (bus_generic_attach(dev));
353 acpi_pci_suspend(device_t dev)
355 int dstate, error, i, numdevs;
356 device_t acpi_dev, child, *devlist;
357 struct pci_devinfo *dinfo;
359 acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
360 device_get_children(dev, &devlist, &numdevs);
363 * Save the PCI configuration space for each child and set the
364 * device in the appropriate power state for this sleep state.
366 for (i = 0; i < numdevs; i++) {
368 dinfo = (struct pci_devinfo *)device_get_ivars(child);
369 pci_cfg_save(child, dinfo, 0);
373 * Suspend devices before potentially powering them down.
375 error = bus_generic_suspend(dev);
377 kfree(devlist, M_TEMP);
382 * Always set the device to D3. If ACPI suggests a different
383 * power state, use it instead. If ACPI is not present, the
384 * firmware is responsible for managing device power. Skip
385 * children who aren't attached since they are powered down
386 * separately. Only manage type 0 devices for now.
388 for (i = 0; acpi_dev && i < numdevs; i++) {
390 dinfo = (struct pci_devinfo *)device_get_ivars(child);
391 if (device_is_attached(child) && dinfo->cfg.hdrtype == 0) {
392 dstate = PCI_POWERSTATE_D3;
393 ACPI_PWR_FOR_SLEEP(acpi_dev, child, &dstate);
394 pci_set_powerstate(child, dstate);
398 kfree(devlist, M_TEMP);
403 acpi_pci_resume(device_t dev)
406 device_t acpi_dev, child, *devlist;
407 struct pci_devinfo *dinfo;
409 acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
410 device_get_children(dev, &devlist, &numdevs);
413 * Set each child to D0 and restore its PCI configuration space.
415 for (i = 0; i < numdevs; i++) {
417 * Notify ACPI we're going to D0 but ignore the result. If
418 * ACPI is not present, the firmware is responsible for
419 * managing device power. Only manage type 0 devices for now.
422 dinfo = (struct pci_devinfo *) device_get_ivars(child);
423 if (acpi_dev && device_is_attached(child) &&
424 dinfo->cfg.hdrtype == 0) {
425 ACPI_PWR_FOR_SLEEP(acpi_dev, child, NULL);
426 pci_set_powerstate(child, PCI_POWERSTATE_D0);
430 * Now the device is powered up, restore its config space.
432 pci_cfg_restore(child, dinfo);
435 kfree(devlist, M_TEMP);
436 return (bus_generic_resume(dev));