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/10.4/sys/dev/acpica/acpi_pci.c 279904 2015-03-12 07:07:41Z scottl $");
31
32 #include "opt_acpi.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40
41 #include <contrib/dev/acpica/include/acpi.h>
42 #include <contrib/dev/acpica/include/accommon.h>
43
44 #include <dev/acpica/acpivar.h>
45
46 #include <sys/pciio.h>
47 #include <dev/pci/pcireg.h>
48 #include <dev/pci/pcivar.h>
49 #include <dev/pci/pci_private.h>
50
51 #include "pcib_if.h"
52 #include "pci_if.h"
53
54 /* Hooks for the ACPI CA debugging infrastructure. */
55 #define _COMPONENT ACPI_BUS
56 ACPI_MODULE_NAME("PCI")
57
58 struct acpi_pci_devinfo {
59 struct pci_devinfo ap_dinfo;
60 ACPI_HANDLE ap_handle;
61 int ap_flags;
62 };
63
64 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
65
66 /* Be sure that ACPI and PCI power states are equivalent. */
67 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
68 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
69 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
70 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
71
72 static int acpi_pci_attach(device_t dev);
73 static int acpi_pci_child_location_str_method(device_t cbdev,
74 device_t child, char *buf, size_t buflen);
75 static int acpi_pci_probe(device_t dev);
76 static int acpi_pci_read_ivar(device_t dev, device_t child, int which,
77 uintptr_t *result);
78 static int acpi_pci_write_ivar(device_t dev, device_t child, int which,
79 uintptr_t value);
80 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
81 void *context, void **status);
82 static int acpi_pci_set_powerstate_method(device_t dev, device_t child,
83 int state);
84 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
85 static bus_dma_tag_t acpi_pci_get_dma_tag(device_t bus, device_t child);
86
87 static device_method_t acpi_pci_methods[] = {
88 /* Device interface */
89 DEVMETHOD(device_probe, acpi_pci_probe),
90 DEVMETHOD(device_attach, acpi_pci_attach),
91
92 /* Bus interface */
93 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar),
94 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar),
95 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
96 DEVMETHOD(bus_get_dma_tag, acpi_pci_get_dma_tag),
97 DEVMETHOD(bus_get_domain, acpi_get_domain),
98
99 /* PCI interface */
100 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method),
101
102 DEVMETHOD_END
103 };
104
105 static devclass_t pci_devclass;
106
107 DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, sizeof(struct pci_softc),
108 pci_driver);
109 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
110 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
111 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
112 MODULE_VERSION(acpi_pci, 1);
113
114 static int
115 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
116 {
117 struct acpi_pci_devinfo *dinfo;
118
119 dinfo = device_get_ivars(child);
120 switch (which) {
121 case ACPI_IVAR_HANDLE:
122 *result = (uintptr_t)dinfo->ap_handle;
123 return (0);
124 case ACPI_IVAR_FLAGS:
125 *result = (uintptr_t)dinfo->ap_flags;
126 return (0);
127 }
128 return (pci_read_ivar(dev, child, which, result));
129 }
130
131 static int
132 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
133 {
134 struct acpi_pci_devinfo *dinfo;
135
136 dinfo = device_get_ivars(child);
137 switch (which) {
138 case ACPI_IVAR_HANDLE:
139 dinfo->ap_handle = (ACPI_HANDLE)value;
140 return (0);
141 case ACPI_IVAR_FLAGS:
142 dinfo->ap_flags = (int)value;
143 return (0);
144 }
145 return (pci_write_ivar(dev, child, which, value));
146 }
147
148 static int
149 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
150 size_t buflen)
151 {
152 struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
153 int pxm;
154 char buf2[32];
155
156 pci_child_location_str_method(cbdev, child, buf, buflen);
157
158 if (dinfo->ap_handle) {
159 strlcat(buf, " handle=", buflen);
160 strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
161
162 if (ACPI_SUCCESS(acpi_GetInteger(dinfo->ap_handle, "_PXM", &pxm))) {
163 snprintf(buf2, 32, " _PXM=%d", pxm);
164 strlcat(buf, buf2, buflen);
165 }
166 }
167 return (0);
168 }
169
170 /*
171 * PCI power manangement
172 */
173 static int
174 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
175 {
176 ACPI_HANDLE h;
177 ACPI_STATUS status;
178 int old_state, error;
179
180 error = 0;
181 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
182 return (EINVAL);
183
184 /*
185 * We set the state using PCI Power Management outside of setting
186 * the ACPI state. This means that when powering down a device, we
187 * first shut it down using PCI, and then using ACPI, which lets ACPI
188 * try to power down any Power Resources that are now no longer used.
189 * When powering up a device, we let ACPI set the state first so that
190 * it can enable any needed Power Resources before changing the PCI
191 * power state.
192 */
193 ACPI_SERIAL_BEGIN(pci_powerstate);
194 old_state = pci_get_powerstate(child);
195 if (old_state < state && pci_do_power_suspend) {
196 error = pci_set_powerstate_method(dev, child, state);
197 if (error)
198 goto out;
199 }
200 h = acpi_get_handle(child);
201 status = acpi_pwr_switch_consumer(h, state);
202 if (ACPI_SUCCESS(status)) {
203 if (bootverbose)
204 device_printf(dev, "set ACPI power state D%d on %s\n",
205 state, acpi_name(h));
206 } else if (status != AE_NOT_FOUND)
207 device_printf(dev,
208 "failed to set ACPI power state D%d on %s: %s\n",
209 state, acpi_name(h), AcpiFormatException(status));
210 if (old_state > state && pci_do_power_resume)
211 error = pci_set_powerstate_method(dev, child, state);
212
213 out:
214 ACPI_SERIAL_END(pci_powerstate);
215 return (error);
216 }
217
218 static void
219 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
220 {
221 ACPI_STATUS status;
222 device_t child;
223
224 /*
225 * Occasionally a PCI device may show up as an ACPI device
226 * with a _HID. (For example, the TabletPC TC1000 has a
227 * second PCI-ISA bridge that has a _HID for an
228 * acpi_sysresource device.) In that case, leave ACPI-CA's
229 * device data pointing at the ACPI-enumerated device.
230 */
231 child = acpi_get_device(handle);
232 if (child != NULL) {
233 KASSERT(device_get_parent(child) ==
234 devclass_get_device(devclass_find("acpi"), 0),
235 ("%s: child (%s)'s parent is not acpi0", __func__,
236 acpi_name(handle)));
237 return;
238 }
239
240 /*
241 * Update ACPI-CA to use the PCI enumerated device_t for this handle.
242 */
243 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
244 if (ACPI_FAILURE(status))
245 printf("WARNING: Unable to attach object data to %s - %s\n",
246 acpi_name(handle), AcpiFormatException(status));
247 }
248
249 static ACPI_STATUS
250 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
251 void **status)
252 {
253 struct acpi_pci_devinfo *dinfo;
254 device_t *devlist;
255 int devcount, i, func, slot;
256 UINT32 address;
257
258 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
259
260 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
261 return_ACPI_STATUS (AE_OK);
262 slot = ACPI_ADR_PCI_SLOT(address);
263 func = ACPI_ADR_PCI_FUNC(address);
264 if (device_get_children((device_t)context, &devlist, &devcount) != 0)
265 return_ACPI_STATUS (AE_OK);
266 for (i = 0; i < devcount; i++) {
267 dinfo = device_get_ivars(devlist[i]);
268 if (dinfo->ap_dinfo.cfg.func == func &&
269 dinfo->ap_dinfo.cfg.slot == slot) {
270 dinfo->ap_handle = handle;
271 acpi_pci_update_device(handle, devlist[i]);
272 break;
273 }
274 }
275 free(devlist, M_TEMP);
276 return_ACPI_STATUS (AE_OK);
277 }
278
279 static int
280 acpi_pci_probe(device_t dev)
281 {
282
283 if (acpi_get_handle(dev) == NULL)
284 return (ENXIO);
285 device_set_desc(dev, "ACPI PCI bus");
286 return (0);
287 }
288
289 static int
290 acpi_pci_attach(device_t dev)
291 {
292 int busno, domain, error;
293
294 error = pci_attach_common(dev);
295 if (error)
296 return (error);
297
298 /*
299 * Since there can be multiple independantly numbered PCI
300 * busses on systems with multiple PCI domains, we can't use
301 * the unit number to decide which bus we are probing. We ask
302 * the parent pcib what our domain and bus numbers are.
303 */
304 domain = pcib_get_domain(dev);
305 busno = pcib_get_bus(dev);
306
307 /*
308 * First, PCI devices are added as in the normal PCI bus driver.
309 * Afterwards, the ACPI namespace under the bridge driver is
310 * walked to save ACPI handles to all the devices that appear in
311 * the ACPI namespace as immediate descendants of the bridge.
312 *
313 * XXX: Sometimes PCI devices show up in the ACPI namespace that
314 * pci_add_children() doesn't find. We currently just ignore
315 * these devices.
316 */
317 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
318 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
319 acpi_pci_save_handle, NULL, dev, NULL);
320
321 return (bus_generic_attach(dev));
322 }
323
324 #ifdef ACPI_DMAR
325 bus_dma_tag_t dmar_get_dma_tag(device_t dev, device_t child);
326 static bus_dma_tag_t
327 acpi_pci_get_dma_tag(device_t bus, device_t child)
328 {
329 bus_dma_tag_t tag;
330
331 if (device_get_parent(child) == bus) {
332 /* try dmar and return if it works */
333 tag = dmar_get_dma_tag(bus, child);
334 } else
335 tag = NULL;
336 if (tag == NULL)
337 tag = pci_get_dma_tag(bus, child);
338 return (tag);
339 }
340 #else
341 static bus_dma_tag_t
342 acpi_pci_get_dma_tag(device_t bus, device_t child)
343 {
344
345 return (pci_get_dma_tag(bus, child));
346 }
347 #endif
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