2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $FreeBSD: src/sys/dev/acpica/acpi_pcib.c,v 1.60.8.1 2009/04/15 03:14:26 kensmith Exp $
31 #include <sys/param.h>
33 #include <sys/malloc.h>
34 #include <sys/kernel.h>
35 #include <sys/machintr.h>
36 #include <machine/smp.h>
39 #include <dev/acpica/acpivar.h>
40 #include <dev/acpica/acpi_pcibvar.h>
42 #include <bus/pci/pcivar.h>
43 #include <bus/pci/pcireg.h>
44 #include <bus/pci/pci_cfgreg.h>
47 /* Hooks for the ACPICA debugging infrastructure. */
48 #define _COMPONENT ACPI_BUS
49 ACPI_MODULE_NAME("PCI")
51 ACPI_SERIAL_DECL(pcib
, "ACPI PCI bus methods");
54 * For locking, we assume the caller is not concurrent since this is
55 * triggered by newbus methods.
58 struct prt_lookup_request
{
59 ACPI_PCI_ROUTING_TABLE
*pr_entry
;
64 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE
*entry
, void *arg
);
66 static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE
*entry
, void *arg
);
67 static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE
*entry
, void *arg
);
68 static void prt_walk_table(ACPI_BUFFER
*prt
, prt_entry_handler
*handler
,
72 prt_walk_table(ACPI_BUFFER
*prt
, prt_entry_handler
*handler
, void *arg
)
74 ACPI_PCI_ROUTING_TABLE
*entry
;
77 /* First check to see if there is a table to walk. */
78 if (prt
== NULL
|| prt
->Pointer
== NULL
)
81 /* Walk the table executing the handler function for each entry. */
82 prtptr
= prt
->Pointer
;
83 entry
= (ACPI_PCI_ROUTING_TABLE
*)prtptr
;
84 while (entry
->Length
!= 0) {
86 prtptr
+= entry
->Length
;
87 entry
= (ACPI_PCI_ROUTING_TABLE
*)prtptr
;
92 prt_attach_devices(ACPI_PCI_ROUTING_TABLE
*entry
, void *arg
)
98 /* We only care about entries that reference a link device. */
99 if (entry
->Source
== NULL
|| entry
->Source
[0] == '\0')
103 * In practice, we only see SourceIndex's of 0 out in the wild.
104 * When indices != 0 have been found, they've been bugs in the ASL.
106 if (entry
->SourceIndex
!= 0)
109 /* Lookup the associated handle and device. */
110 pcib
= (device_t
)arg
;
111 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT
, entry
->Source
, &handle
)))
113 child
= acpi_get_device(handle
);
117 /* If the device hasn't been probed yet, force it to do so. */
118 error
= device_probe_and_attach(child
);
120 device_printf(pcib
, "failed to force attach of %s\n",
125 /* Add a reference for a specific bus/device/pin tuple. */
126 acpi_pci_link_add_reference(child
, entry
->SourceIndex
, pcib
,
127 ACPI_ADR_PCI_SLOT(entry
->Address
), entry
->Pin
);
131 acpi_pcib_attach(device_t dev
, ACPI_BUFFER
*prt
, int busno
)
136 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
138 if (!acpi_DeviceIsPresent(dev
)) {
139 /* Caller should already have checked it */
140 panic("%s device is not present", __func__
);
143 ACPI_SERIAL_INIT(pcib
);
146 * Get the PCI interrupt routing table for this bus. If we can't
147 * get it, this is not an error but may reduce functionality. There
148 * are several valid bridges in the field that do not have a _PRT, so
149 * only warn about missing tables if bootverbose is set.
151 prt
->Length
= ACPI_ALLOCATE_BUFFER
;
152 status
= AcpiGetIrqRoutingTable(acpi_get_handle(dev
), prt
);
153 if (ACPI_FAILURE(status
) && (bootverbose
|| status
!= AE_NOT_FOUND
))
155 "could not get PCI interrupt routing table for %s - %s\n",
156 acpi_name(acpi_get_handle(dev
)), AcpiFormatException(status
));
159 * Attach the PCI bus proper.
161 if ((child
= device_add_child(dev
, "pci", busno
)) == NULL
) {
162 device_printf(device_get_parent(dev
), "couldn't attach pci bus\n");
167 * Now go scan the bus.
169 prt_walk_table(prt
, prt_attach_devices
, dev
);
171 return_VALUE (bus_generic_attach(dev
));
175 acpi_pcib_resume(device_t dev
)
178 return (bus_generic_resume(dev
));
182 prt_lookup_device(ACPI_PCI_ROUTING_TABLE
*entry
, void *arg
)
184 struct prt_lookup_request
*pr
;
186 pr
= (struct prt_lookup_request
*)arg
;
187 if (pr
->pr_entry
!= NULL
)
191 * Compare the slot number (high word of Address) and pin number
192 * (note that ACPI uses 0 for INTA) to check for a match.
194 * Note that the low word of the Address field (function number)
195 * is required by the specification to be 0xffff. We don't risk
198 if (ACPI_ADR_PCI_SLOT(entry
->Address
) == pr
->pr_slot
&&
199 entry
->Pin
== pr
->pr_pin
)
200 pr
->pr_entry
= entry
;
204 * Route an interrupt for a child of the bridge.
207 acpi_pcib_route_interrupt(device_t pcib
, device_t dev
, int pin
,
210 ACPI_PCI_ROUTING_TABLE
*prt
;
211 struct prt_lookup_request pr
;
215 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
217 interrupt
= PCI_INVALID_IRQ
;
219 /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
222 ACPI_SERIAL_BEGIN(pcib
);
224 /* Search for a matching entry in the routing table. */
227 pr
.pr_slot
= pci_get_slot(dev
);
228 prt_walk_table(prtbuf
, prt_lookup_device
, &pr
);
229 if (pr
.pr_entry
== NULL
) {
230 device_printf(pcib
, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev
),
231 pci_get_slot(dev
), 'A' + pin
);
237 device_printf(pcib
, "matched entry for %d.%d.INT%c",
238 pci_get_bus(dev
), pci_get_slot(dev
), 'A' + pin
);
239 if (prt
->Source
!= NULL
&& prt
->Source
[0] != '\0')
240 kprintf(" (src %s:%u)", prt
->Source
, prt
->SourceIndex
);
245 * If source is empty/NULL, the source index is a GSI and it's hardwired
248 * XXX: If the source index is non-zero, ignore the source device and
249 * assume that this is a hardwired entry.
251 if (prt
->Source
== NULL
|| prt
->Source
[0] == '\0' ||
252 prt
->SourceIndex
!= 0) {
253 if (prt
->SourceIndex
) {
254 interrupt
= machintr_legacy_intr_find_bygsi(prt
->SourceIndex
,
255 INTR_TRIGGER_LEVEL
, INTR_POLARITY_LOW
);
257 device_printf(pcib
, "slot %d INT%c hardwired to "
258 "invalid GSI %d\n", pci_get_slot(dev
), 'A' + pin
,
260 interrupt
= PCI_INVALID_IRQ
;
264 device_printf(pcib
, "slot %d INT%c hardwired to "
265 "GSI %d, IRQ %d\n", pci_get_slot(dev
), 'A' + pin
,
266 prt
->SourceIndex
, interrupt
);
269 BUS_CONFIG_INTR(device_get_parent(dev
), dev
, interrupt
,
270 INTR_TRIGGER_LEVEL
, INTR_POLARITY_LOW
);
272 device_printf(pcib
, "invalid hardwired GSI 0\n");
278 * We have to find the source device (PCI interrupt link device).
280 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT
, prt
->Source
, &lnkdev
))) {
281 device_printf(pcib
, "couldn't find PCI interrupt link device %s\n",
285 interrupt
= acpi_pci_link_route_interrupt(acpi_get_device(lnkdev
),
288 if (bootverbose
&& PCI_INTERRUPT_VALID(interrupt
)) {
289 device_printf(pcib
, "slot %d INT%c routed to irq %d via %s\n",
290 pci_get_slot(dev
), 'A' + pin
, interrupt
, acpi_name(lnkdev
));
294 ACPI_SERIAL_END(pcib
);
296 return_VALUE (interrupt
);
300 acpi_pcib_probe(device_t dev
)
303 * Don't attach if we're not really there.
305 * XXX: This isn't entirely correct since we may be a PCI bus
306 * on a hot-plug docking station, etc.
308 if (!acpi_DeviceIsPresent(dev
))
311 if (pci_cfgregopen() == 0)