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 <machine/smp.h>
38 #include <dev/acpica5/acpivar.h>
39 #include <dev/acpica5/acpi_pcibvar.h>
41 #include <bus/pci/pcivar.h>
42 #include <bus/pci/pcireg.h>
45 /* Hooks for the ACPI CA debugging infrastructure. */
46 #define _COMPONENT ACPI_BUS
47 ACPI_MODULE_NAME("PCI")
49 ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
52 * For locking, we assume the caller is not concurrent since this is
53 * triggered by newbus methods.
56 struct prt_lookup_request {
57 ACPI_PCI_ROUTING_TABLE *pr_entry;
62 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
64 static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
65 static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
66 static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
70 prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
72 ACPI_PCI_ROUTING_TABLE *entry;
75 /* First check to see if there is a table to walk. */
76 if (prt == NULL || prt->Pointer == NULL)
79 /* Walk the table executing the handler function for each entry. */
80 prtptr = prt->Pointer;
81 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
82 while (entry->Length != 0) {
84 prtptr += entry->Length;
85 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
90 prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
96 /* We only care about entries that reference a link device. */
97 if (entry->Source == NULL || entry->Source[0] == '\0')
101 * In practice, we only see SourceIndex's of 0 out in the wild.
102 * When indices != 0 have been found, they've been bugs in the ASL.
104 if (entry->SourceIndex != 0)
107 /* Lookup the associated handle and device. */
108 pcib = (device_t)arg;
109 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
111 child = acpi_get_device(handle);
115 /* If the device hasn't been probed yet, force it to do so. */
116 error = device_probe_and_attach(child);
118 device_printf(pcib, "failed to force attach of %s\n",
123 /* Add a reference for a specific bus/device/pin tuple. */
124 acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
125 ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
129 acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
134 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
137 * Don't attach if we're not really there.
139 * XXX: This isn't entirely correct since we may be a PCI bus
140 * on a hot-plug docking station, etc.
142 if (!acpi_DeviceIsPresent(dev))
145 ACPI_SERIAL_INIT(pcib);
148 * Get the PCI interrupt routing table for this bus. If we can't
149 * get it, this is not an error but may reduce functionality. There
150 * are several valid bridges in the field that do not have a _PRT, so
151 * only warn about missing tables if bootverbose is set.
153 prt->Length = ACPI_ALLOCATE_BUFFER;
154 status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
155 if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
157 "could not get PCI interrupt routing table for %s - %s\n",
158 acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
161 * Attach the PCI bus proper.
163 if ((child = device_add_child(dev, "pci", busno)) == NULL) {
164 device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
169 * Now go scan the bus.
171 prt_walk_table(prt, prt_attach_devices, dev);
173 return_VALUE (bus_generic_attach(dev));
177 acpi_pcib_resume(device_t dev)
180 return (bus_generic_resume(dev));
184 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
186 struct prt_lookup_request *pr;
188 pr = (struct prt_lookup_request *)arg;
189 if (pr->pr_entry != NULL)
193 * Compare the slot number (high word of Address) and pin number
194 * (note that ACPI uses 0 for INTA) to check for a match.
196 * Note that the low word of the Address field (function number)
197 * is required by the specification to be 0xffff. We don't risk
200 if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
201 entry->Pin == pr->pr_pin)
202 pr->pr_entry = entry;
206 * Route an interrupt for a child of the bridge.
209 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
212 ACPI_PCI_ROUTING_TABLE *prt;
213 struct prt_lookup_request pr;
217 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
219 interrupt = PCI_INVALID_IRQ;
221 /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
224 ACPI_SERIAL_BEGIN(pcib);
226 /* Search for a matching entry in the routing table. */
229 pr.pr_slot = pci_get_slot(dev);
230 prt_walk_table(prtbuf, prt_lookup_device, &pr);
231 if (pr.pr_entry == NULL) {
232 device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
233 pci_get_slot(dev), 'A' + pin);
239 device_printf(pcib, "matched entry for %d.%d.INT%c",
240 pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
241 if (prt->Source != NULL && prt->Source[0] != '\0')
242 kprintf(" (src %s:%u)", prt->Source, prt->SourceIndex);
247 * If source is empty/NULL, the source index is a global IRQ number
248 * and it's hard-wired so we're done.
250 * XXX: If the source index is non-zero, ignore the source device and
251 * assume that this is a hard-wired entry.
253 if (prt->Source == NULL || prt->Source[0] == '\0' ||
254 prt->SourceIndex != 0) {
256 device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
257 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
258 if (prt->SourceIndex) {
259 interrupt = prt->SourceIndex;
261 /* TODO MachIntr.intr_find */
262 BUS_CONFIG_INTR(device_get_parent(dev), dev, interrupt,
263 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
265 device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
270 * We have to find the source device (PCI interrupt link device).
272 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
273 device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
277 interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
280 if (bootverbose && PCI_INTERRUPT_VALID(interrupt)) {
281 device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
282 pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
286 ACPI_SERIAL_END(pcib);
288 return_VALUE (interrupt);