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/9.0/sys/dev/acpica/acpi_pci.c 223207 2011-06-17 21:19:01Z 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/include/acpi.h>
40 #include <contrib/dev/acpica/include/accommon.h>
41
42 #include <dev/acpica/acpivar.h>
43
44 #include <sys/pciio.h>
45 #include <dev/pci/pcireg.h>
46 #include <dev/pci/pcivar.h>
47 #include <dev/pci/pci_private.h>
48
49 #include "pcib_if.h"
50 #include "pci_if.h"
51
52 /* Hooks for the ACPI CA debugging infrastructure. */
53 #define _COMPONENT ACPI_BUS
54 ACPI_MODULE_NAME("PCI")
55
56 struct acpi_pci_devinfo {
57 struct pci_devinfo ap_dinfo;
58 ACPI_HANDLE ap_handle;
59 int ap_flags;
60 };
61
62 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
63
64 /* Be sure that ACPI and PCI power states are equivalent. */
65 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
66 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
67 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
68 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
69
70 static int acpi_pci_attach(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,
75 uintptr_t *result);
76 static int acpi_pci_write_ivar(device_t dev, device_t child, int which,
77 uintptr_t value);
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,
81 int state);
82 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
83
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
89 /* Bus interface */
90 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar),
91 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar),
92 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
93
94 /* PCI interface */
95 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
96
97 { 0, 0 }
98 };
99
100 static devclass_t pci_devclass;
101
102 DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver);
103 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
104 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
105 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
106 MODULE_VERSION(acpi_pci, 1);
107
108 static int
109 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
110 {
111 struct acpi_pci_devinfo *dinfo;
112
113 dinfo = device_get_ivars(child);
114 switch (which) {
115 case ACPI_IVAR_HANDLE:
116 *result = (uintptr_t)dinfo->ap_handle;
117 return (0);
118 case ACPI_IVAR_FLAGS:
119 *result = (uintptr_t)dinfo->ap_flags;
120 return (0);
121 }
122 return (pci_read_ivar(dev, child, which, result));
123 }
124
125 static int
126 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
127 {
128 struct acpi_pci_devinfo *dinfo;
129
130 dinfo = device_get_ivars(child);
131 switch (which) {
132 case ACPI_IVAR_HANDLE:
133 dinfo->ap_handle = (ACPI_HANDLE)value;
134 return (0);
135 case ACPI_IVAR_FLAGS:
136 dinfo->ap_flags = (int)value;
137 return (0);
138 }
139 return (pci_write_ivar(dev, child, which, value));
140 }
141
142 static int
143 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
144 size_t buflen)
145 {
146 struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
147
148 pci_child_location_str_method(cbdev, child, buf, buflen);
149
150 if (dinfo->ap_handle) {
151 strlcat(buf, " handle=", buflen);
152 strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
153 }
154 return (0);
155 }
156
157 /*
158 * PCI power manangement
159 */
160 static int
161 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
162 {
163 ACPI_HANDLE h;
164 ACPI_STATUS status;
165 int old_state, error;
166
167 error = 0;
168 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
169 return (EINVAL);
170
171 /*
172 * We set the state using PCI Power Management outside of setting
173 * the ACPI state. This means that when powering down a device, we
174 * first shut it down using PCI, and then using ACPI, which lets ACPI
175 * try to power down any Power Resources that are now no longer used.
176 * When powering up a device, we let ACPI set the state first so that
177 * it can enable any needed Power Resources before changing the PCI
178 * power state.
179 */
180 ACPI_SERIAL_BEGIN(pci_powerstate);
181 old_state = pci_get_powerstate(child);
182 if (old_state < state && pci_do_power_suspend) {
183 error = pci_set_powerstate_method(dev, child, state);
184 if (error)
185 goto out;
186 }
187 h = acpi_get_handle(child);
188 status = acpi_pwr_switch_consumer(h, state);
189 if (ACPI_SUCCESS(status)) {
190 if (bootverbose)
191 device_printf(dev, "set ACPI power state D%d on %s\n",
192 state, acpi_name(h));
193 } else if (status != AE_NOT_FOUND)
194 device_printf(dev,
195 "failed to set ACPI power state D%d on %s: %s\n",
196 state, acpi_name(h), AcpiFormatException(status));
197 if (old_state > state && pci_do_power_resume)
198 error = pci_set_powerstate_method(dev, child, state);
199
200 out:
201 ACPI_SERIAL_END(pci_powerstate);
202 return (error);
203 }
204
205 static void
206 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
207 {
208 ACPI_STATUS status;
209 device_t child;
210
211 /*
212 * Occasionally a PCI device may show up as an ACPI device
213 * with a _HID. (For example, the TabletPC TC1000 has a
214 * second PCI-ISA bridge that has a _HID for an
215 * acpi_sysresource device.) In that case, leave ACPI-CA's
216 * device data pointing at the ACPI-enumerated device.
217 */
218 child = acpi_get_device(handle);
219 if (child != NULL) {
220 KASSERT(device_get_parent(child) ==
221 devclass_get_device(devclass_find("acpi"), 0),
222 ("%s: child (%s)'s parent is not acpi0", __func__,
223 acpi_name(handle)));
224 return;
225 }
226
227 /*
228 * Update ACPI-CA to use the PCI enumerated device_t for this handle.
229 */
230 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
231 if (ACPI_FAILURE(status))
232 printf("WARNING: Unable to attach object data to %s - %s\n",
233 acpi_name(handle), AcpiFormatException(status));
234 }
235
236 static ACPI_STATUS
237 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
238 void **status)
239 {
240 struct acpi_pci_devinfo *dinfo;
241 device_t *devlist;
242 int devcount, i, func, slot;
243 UINT32 address;
244
245 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
246
247 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
248 return_ACPI_STATUS (AE_OK);
249 slot = ACPI_ADR_PCI_SLOT(address);
250 func = ACPI_ADR_PCI_FUNC(address);
251 if (device_get_children((device_t)context, &devlist, &devcount) != 0)
252 return_ACPI_STATUS (AE_OK);
253 for (i = 0; i < devcount; i++) {
254 dinfo = device_get_ivars(devlist[i]);
255 if (dinfo->ap_dinfo.cfg.func == func &&
256 dinfo->ap_dinfo.cfg.slot == slot) {
257 dinfo->ap_handle = handle;
258 acpi_pci_update_device(handle, devlist[i]);
259 break;
260 }
261 }
262 free(devlist, M_TEMP);
263 return_ACPI_STATUS (AE_OK);
264 }
265
266 static int
267 acpi_pci_probe(device_t dev)
268 {
269
270 if (acpi_get_handle(dev) == NULL)
271 return (ENXIO);
272 device_set_desc(dev, "ACPI PCI bus");
273 return (0);
274 }
275
276 static int
277 acpi_pci_attach(device_t dev)
278 {
279 int busno, domain;
280
281 /*
282 * Since there can be multiple independantly numbered PCI
283 * busses on systems with multiple PCI domains, we can't use
284 * the unit number to decide which bus we are probing. We ask
285 * the parent pcib what our domain and bus numbers are.
286 */
287 domain = pcib_get_domain(dev);
288 busno = pcib_get_bus(dev);
289 if (bootverbose)
290 device_printf(dev, "domain=%d, physical bus=%d\n",
291 domain, busno);
292
293 /*
294 * First, PCI devices are added as in the normal PCI bus driver.
295 * Afterwards, the ACPI namespace under the bridge driver is
296 * walked to save ACPI handles to all the devices that appear in
297 * the ACPI namespace as immediate descendants of the bridge.
298 *
299 * XXX: Sometimes PCI devices show up in the ACPI namespace that
300 * pci_add_children() doesn't find. We currently just ignore
301 * these devices.
302 */
303 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
304 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
305 acpi_pci_save_handle, NULL, dev, NULL);
306
307 return (bus_generic_attach(dev));
308 }
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