1 /*-
2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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.
14 *
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
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/6.4/sys/dev/acpica/acpi_pcib.c 153356 2005-12-12 19:33:32Z jhb $");
30
31 #include "opt_acpi.h"
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36
37 #include <contrib/dev/acpica/acpi.h>
38 #include <dev/acpica/acpivar.h>
39 #include <dev/acpica/acpi_pcibvar.h>
40
41 #include <dev/pci/pcivar.h>
42 #include "pcib_if.h"
43
44 /* Hooks for the ACPI CA debugging infrastructure. */
45 #define _COMPONENT ACPI_BUS
46 ACPI_MODULE_NAME("PCI")
47
48 ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
49
50 /*
51 * For locking, we assume the caller is not concurrent since this is
52 * triggered by newbus methods.
53 */
54
55 struct prt_lookup_request {
56 ACPI_PCI_ROUTING_TABLE *pr_entry;
57 u_int pr_pin;
58 u_int pr_slot;
59 };
60
61 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
62
63 static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
64 static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
65 static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
66 void *arg);
67
68 static void
69 prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
70 {
71 ACPI_PCI_ROUTING_TABLE *entry;
72 char *prtptr;
73
74 /* First check to see if there is a table to walk. */
75 if (prt == NULL || prt->Pointer == NULL)
76 return;
77
78 /* Walk the table executing the handler function for each entry. */
79 prtptr = prt->Pointer;
80 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
81 while (entry->Length != 0) {
82 handler(entry, arg);
83 prtptr += entry->Length;
84 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
85 }
86 }
87
88 static void
89 prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
90 {
91 ACPI_HANDLE handle;
92 device_t child, pcib;
93 int error;
94
95 /* We only care about entries that reference a link device. */
96 if (entry->Source == NULL || entry->Source[0] == '\0')
97 return;
98
99 /*
100 * In practice, we only see SourceIndex's of 0 out in the wild.
101 * When indices != 0 have been found, they've been bugs in the ASL.
102 */
103 if (entry->SourceIndex != 0)
104 return;
105
106 /* Lookup the associated handle and device. */
107 pcib = (device_t)arg;
108 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
109 return;
110 child = acpi_get_device(handle);
111 if (child == NULL)
112 return;
113
114 /* If the device hasn't been probed yet, force it to do so. */
115 error = device_probe_and_attach(child);
116 if (error != 0) {
117 device_printf(pcib, "failed to force attach of %s\n",
118 acpi_name(handle));
119 return;
120 }
121
122 /* Add a reference for a specific bus/device/pin tuple. */
123 acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
124 ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
125 }
126
127 int
128 acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
129 {
130 device_t child;
131 ACPI_STATUS status;
132
133 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
134
135 /*
136 * Don't attach if we're not really there.
137 *
138 * XXX: This isn't entirely correct since we may be a PCI bus
139 * on a hot-plug docking station, etc.
140 */
141 if (!acpi_DeviceIsPresent(dev))
142 return_VALUE(ENXIO);
143
144 /*
145 * Get the PCI interrupt routing table for this bus. If we can't
146 * get it, this is not an error but may reduce functionality. There
147 * are several valid bridges in the field that do not have a _PRT, so
148 * only warn about missing tables if bootverbose is set.
149 */
150 prt->Length = ACPI_ALLOCATE_BUFFER;
151 status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
152 if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
153 device_printf(dev,
154 "could not get PCI interrupt routing table for %s - %s\n",
155 acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
156
157 /*
158 * Attach the PCI bus proper.
159 */
160 if ((child = device_add_child(dev, "pci", busno)) == NULL) {
161 device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
162 return_VALUE(ENXIO);
163 }
164
165 /*
166 * Now go scan the bus.
167 */
168 prt_walk_table(prt, prt_attach_devices, dev);
169
170 return_VALUE (bus_generic_attach(dev));
171 }
172
173 int
174 acpi_pcib_resume(device_t dev)
175 {
176
177 return (bus_generic_resume(dev));
178 }
179
180 static void
181 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
182 {
183 struct prt_lookup_request *pr;
184
185 pr = (struct prt_lookup_request *)arg;
186 if (pr->pr_entry != NULL)
187 return;
188
189 /*
190 * Compare the slot number (high word of Address) and pin number
191 * (note that ACPI uses 0 for INTA) to check for a match.
192 *
193 * Note that the low word of the Address field (function number)
194 * is required by the specification to be 0xffff. We don't risk
195 * checking it here.
196 */
197 if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
198 entry->Pin == pr->pr_pin)
199 pr->pr_entry = entry;
200 }
201
202 /*
203 * Route an interrupt for a child of the bridge.
204 */
205 int
206 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
207 ACPI_BUFFER *prtbuf)
208 {
209 ACPI_PCI_ROUTING_TABLE *prt;
210 struct prt_lookup_request pr;
211 ACPI_HANDLE lnkdev;
212 int interrupt;
213
214 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
215
216 interrupt = PCI_INVALID_IRQ;
217
218 /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
219 pin--;
220
221 ACPI_SERIAL_BEGIN(pcib);
222
223 /* Search for a matching entry in the routing table. */
224 pr.pr_entry = NULL;
225 pr.pr_pin = pin;
226 pr.pr_slot = pci_get_slot(dev);
227 prt_walk_table(prtbuf, prt_lookup_device, &pr);
228 if (pr.pr_entry == NULL) {
229 device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
230 pci_get_slot(dev), 'A' + pin);
231 goto out;
232 }
233 prt = pr.pr_entry;
234
235 if (bootverbose) {
236 device_printf(pcib, "matched entry for %d.%d.INT%c",
237 pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
238 if (prt->Source != NULL && prt->Source[0] != '\0')
239 printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
240 printf("\n");
241 }
242
243 /*
244 * If source is empty/NULL, the source index is a global IRQ number
245 * and it's hard-wired so we're done.
246 *
247 * XXX: If the source index is non-zero, ignore the source device and
248 * assume that this is a hard-wired entry.
249 */
250 if (prt->Source == NULL || prt->Source[0] == '\0' ||
251 prt->SourceIndex != 0) {
252 if (bootverbose)
253 device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
254 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
255 if (prt->SourceIndex) {
256 interrupt = prt->SourceIndex;
257 BUS_CONFIG_INTR(dev, interrupt, INTR_TRIGGER_LEVEL,
258 INTR_POLARITY_LOW);
259 } else
260 device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
261 goto out;
262 }
263
264 /*
265 * We have to find the source device (PCI interrupt link device).
266 */
267 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
268 device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
269 prt->Source);
270 goto out;
271 }
272 interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
273 prt->SourceIndex);
274
275 if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
276 device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
277 pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
278
279 out:
280 ACPI_SERIAL_END(pcib);
281
282 return_VALUE (interrupt);
283 }
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