1 /*-
2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
3 * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000, BSDi
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
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.
16 *
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 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/7.3/sys/dev/acpica/acpi_pci.c 173226 2007-10-31 16:10:12Z jhb $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38
39 #include <contrib/dev/acpica/acpi.h>
40 #include <dev/acpica/acpivar.h>
41
42 #include <sys/pciio.h>
43 #include <dev/pci/pcireg.h>
44 #include <dev/pci/pcivar.h>
45 #include <dev/pci/pci_private.h>
46
47 #include "pcib_if.h"
48 #include "pci_if.h"
49
50 /* Hooks for the ACPI CA debugging infrastructure. */
51 #define _COMPONENT ACPI_BUS
52 ACPI_MODULE_NAME("PCI")
53
54 struct acpi_pci_devinfo {
55 struct pci_devinfo ap_dinfo;
56 ACPI_HANDLE ap_handle;
57 int ap_flags;
58 };
59
60 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
61
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);
67
68 static int acpi_pci_attach(device_t dev);
69 static int acpi_pci_child_location_str_method(device_t cbdev,
70 device_t child, char *buf, size_t buflen);
71 static int acpi_pci_probe(device_t dev);
72 static int acpi_pci_read_ivar(device_t dev, device_t child, int which,
73 uintptr_t *result);
74 static int acpi_pci_write_ivar(device_t dev, device_t child, int which,
75 uintptr_t value);
76 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
77 void *context, void **status);
78 static int acpi_pci_set_powerstate_method(device_t dev, device_t child,
79 int state);
80 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
81
82 static device_method_t acpi_pci_methods[] = {
83 /* Device interface */
84 DEVMETHOD(device_probe, acpi_pci_probe),
85 DEVMETHOD(device_attach, acpi_pci_attach),
86
87 /* Bus interface */
88 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar),
89 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar),
90 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
91
92 /* PCI interface */
93 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
94
95 { 0, 0 }
96 };
97
98 static devclass_t pci_devclass;
99
100 DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver);
101 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
102 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
103 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
104 MODULE_VERSION(acpi_pci, 1);
105
106 static int
107 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
108 {
109 struct acpi_pci_devinfo *dinfo;
110
111 dinfo = device_get_ivars(child);
112 switch (which) {
113 case ACPI_IVAR_HANDLE:
114 *result = (uintptr_t)dinfo->ap_handle;
115 return (0);
116 case ACPI_IVAR_FLAGS:
117 *result = (uintptr_t)dinfo->ap_flags;
118 return (0);
119 }
120 return (pci_read_ivar(dev, child, which, result));
121 }
122
123 static int
124 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
125 {
126 struct acpi_pci_devinfo *dinfo;
127
128 dinfo = device_get_ivars(child);
129 switch (which) {
130 case ACPI_IVAR_HANDLE:
131 dinfo->ap_handle = (ACPI_HANDLE)value;
132 return (0);
133 case ACPI_IVAR_FLAGS:
134 dinfo->ap_flags = (int)value;
135 return (0);
136 }
137 return (pci_write_ivar(dev, child, which, value));
138 }
139
140 static int
141 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
142 size_t buflen)
143 {
144 struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
145
146 pci_child_location_str_method(cbdev, child, buf, buflen);
147
148 if (dinfo->ap_handle) {
149 strlcat(buf, " handle=", buflen);
150 strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
151 }
152 return (0);
153 }
154
155 /*
156 * PCI power manangement
157 */
158 static int
159 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
160 {
161 ACPI_HANDLE h;
162 ACPI_STATUS status;
163 int old_state, error;
164
165 error = 0;
166 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
167 return (EINVAL);
168
169 /*
170 * We set the state using PCI Power Management outside of setting
171 * the ACPI state. This means that when powering down a device, we
172 * first shut it down using PCI, and then using ACPI, which lets ACPI
173 * try to power down any Power Resources that are now no longer used.
174 * When powering up a device, we let ACPI set the state first so that
175 * it can enable any needed Power Resources before changing the PCI
176 * power state.
177 */
178 ACPI_SERIAL_BEGIN(pci_powerstate);
179 old_state = pci_get_powerstate(child);
180 if (old_state < state) {
181 error = pci_set_powerstate_method(dev, child, state);
182 if (error)
183 goto out;
184 }
185 h = acpi_get_handle(child);
186 status = acpi_pwr_switch_consumer(h, state);
187 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
188 device_printf(dev,
189 "Failed to set ACPI power state D%d on %s: %s\n",
190 state, acpi_name(h), AcpiFormatException(status));
191 if (old_state > state)
192 error = pci_set_powerstate_method(dev, child, state);
193
194 out:
195 ACPI_SERIAL_END(pci_powerstate);
196 return (error);
197 }
198
199 static void
200 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
201 {
202 ACPI_STATUS status;
203 device_t child;
204
205 /*
206 * Lookup and remove the unused device that acpi0 creates when it walks
207 * the namespace creating devices.
208 */
209 child = acpi_get_device(handle);
210 if (child != NULL) {
211 if (device_is_alive(child)) {
212 /*
213 * The TabletPC TC1000 has a second PCI-ISA bridge
214 * that has a _HID for an acpi_sysresource device.
215 * In that case, leave ACPI-CA's device data pointing
216 * at the ACPI-enumerated device.
217 */
218 device_printf(child,
219 "Conflicts with PCI device %d:%d:%d\n",
220 pci_get_bus(pci_child), pci_get_slot(pci_child),
221 pci_get_function(pci_child));
222 return;
223 }
224 KASSERT(device_get_parent(child) ==
225 devclass_get_device(devclass_find("acpi"), 0),
226 ("%s: child (%s)'s parent is not acpi0", __func__,
227 acpi_name(handle)));
228 device_delete_child(device_get_parent(child), child);
229 }
230
231 /*
232 * Update ACPI-CA to use the PCI enumerated device_t for this handle.
233 */
234 status = AcpiDetachData(handle, acpi_fake_objhandler);
235 if (ACPI_FAILURE(status))
236 printf("WARNING: Unable to detach object data from %s - %s\n",
237 acpi_name(handle), AcpiFormatException(status));
238 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
239 if (ACPI_FAILURE(status))
240 printf("WARNING: Unable to attach object data to %s - %s\n",
241 acpi_name(handle), AcpiFormatException(status));
242 }
243
244 static ACPI_STATUS
245 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
246 void **status)
247 {
248 struct acpi_pci_devinfo *dinfo;
249 device_t *devlist;
250 int devcount, i, func, slot;
251 UINT32 address;
252
253 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
254
255 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
256 return_ACPI_STATUS (AE_OK);
257 slot = ACPI_ADR_PCI_SLOT(address);
258 func = ACPI_ADR_PCI_FUNC(address);
259 if (device_get_children((device_t)context, &devlist, &devcount) != 0)
260 return_ACPI_STATUS (AE_OK);
261 for (i = 0; i < devcount; i++) {
262 dinfo = device_get_ivars(devlist[i]);
263 if (dinfo->ap_dinfo.cfg.func == func &&
264 dinfo->ap_dinfo.cfg.slot == slot) {
265 dinfo->ap_handle = handle;
266 acpi_pci_update_device(handle, devlist[i]);
267 break;
268 }
269 }
270 free(devlist, M_TEMP);
271 return_ACPI_STATUS (AE_OK);
272 }
273
274 static int
275 acpi_pci_probe(device_t dev)
276 {
277
278 if (pcib_get_bus(dev) < 0)
279 return (ENXIO);
280 if (acpi_get_handle(dev) == NULL)
281 return (ENXIO);
282 device_set_desc(dev, "ACPI PCI bus");
283 return (0);
284 }
285
286 static int
287 acpi_pci_attach(device_t dev)
288 {
289 int busno, domain;
290
291 /*
292 * Since there can be multiple independantly numbered PCI
293 * busses on systems with multiple PCI domains, we can't use
294 * the unit number to decide which bus we are probing. We ask
295 * the parent pcib what our domain and bus numbers are.
296 */
297 domain = pcib_get_domain(dev);
298 busno = pcib_get_bus(dev);
299 if (bootverbose)
300 device_printf(dev, "domain=%d, physical bus=%d\n",
301 domain, busno);
302
303 /*
304 * First, PCI devices are added as in the normal PCI bus driver.
305 * Afterwards, the ACPI namespace under the bridge driver is
306 * walked to save ACPI handles to all the devices that appear in
307 * the ACPI namespace as immediate descendants of the bridge.
308 *
309 * XXX: Sometimes PCI devices show up in the ACPI namespace that
310 * pci_add_children() doesn't find. We currently just ignore
311 * these devices.
312 */
313 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
314 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
315 acpi_pci_save_handle, dev, NULL);
316
317 return (bus_generic_attach(dev));
318 }
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