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
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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,
69 #define PCI_INVALID_IRQ 255
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__);
139 * Don't attach if we're not really there.
141 * XXX: This isn't entirely correct since we may be a PCI bus
142 * on a hot-plug docking station, etc.
145 if (!acpi_DeviceIsPresent(dev))
148 ACPI_SERIAL_INIT(pcib);
151 * Get the PCI interrupt routing table for this bus. If we can't
152 * get it, this is not an error but may reduce functionality. There
153 * are several valid bridges in the field that do not have a _PRT, so
154 * only warn about missing tables if bootverbose is set.
156 prt->Length = ACPI_ALLOCATE_BUFFER;
157 status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
158 if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
160 "could not get PCI interrupt routing table for %s - %s\n",
161 acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
164 * Attach the PCI bus proper.
166 if ((child = device_add_child(dev, "pci", busno)) == NULL) {
167 device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
172 * Now go scan the bus.
174 prt_walk_table(prt, prt_attach_devices, dev);
176 return_VALUE (bus_generic_attach(dev));
180 acpi_pcib_resume(device_t dev)
183 return (bus_generic_resume(dev));
187 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
189 struct prt_lookup_request *pr;
191 pr = (struct prt_lookup_request *)arg;
192 if (pr->pr_entry != NULL)
196 * Compare the slot number (high word of Address) and pin number
197 * (note that ACPI uses 0 for INTA) to check for a match.
199 * Note that the low word of the Address field (function number)
200 * is required by the specification to be 0xffff. We don't risk
203 if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
204 entry->Pin == pr->pr_pin)
205 pr->pr_entry = entry;
209 * Route an interrupt for a child of the bridge.
212 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
215 ACPI_PCI_ROUTING_TABLE *prt;
216 struct prt_lookup_request pr;
220 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
222 interrupt = PCI_INVALID_IRQ;
224 /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
227 ACPI_SERIAL_BEGIN(pcib);
229 /* Search for a matching entry in the routing table. */
232 pr.pr_slot = pci_get_slot(dev);
233 prt_walk_table(prtbuf, prt_lookup_device, &pr);
234 if (pr.pr_entry == NULL) {
235 device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
236 pci_get_slot(dev), 'A' + pin);
242 device_printf(pcib, "matched entry for %d.%d.INT%c",
243 pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
244 if (prt->Source != NULL && prt->Source[0] != '\0')
245 kprintf(" (src %s:%u)", prt->Source, prt->SourceIndex);
250 * If source is empty/NULL, the source index is a global IRQ number
251 * and it's hard-wired so we're done.
253 * XXX: If the source index is non-zero, ignore the source device and
254 * assume that this is a hard-wired entry.
256 if (prt->Source == NULL || prt->Source[0] == '\0' ||
257 prt->SourceIndex != 0) {
259 device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
260 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
261 if (prt->SourceIndex) {
262 interrupt = prt->SourceIndex;
263 /* interrupt = BUS_CONFIG_INTR(device_get_parent(dev), dev, interrupt, INTR_TRIGGER_LEVEL,
266 /* pci_apic_irq() accepts pin number (WHY?) instead of irq number, so we pass it.
267 * Interrupt routing still depends on mptable and is not of any use then.
269 interrupt = BUS_CONFIG_INTR(device_get_parent(dev), dev, pin, INTR_TRIGGER_LEVEL,
272 device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
277 * We have to find the source device (PCI interrupt link device).
279 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
280 device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
284 interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
287 if (bootverbose && PCI_INTERRUPT_VALID(interrupt)) {
288 if (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);