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/10.2/sys/dev/acpica/acpi_pcib.c 279195 2015-02-23 01:17:45Z kib $");
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/include/acpi.h>
38 #include <contrib/dev/acpica/include/accommon.h>
39
40 #include <dev/acpica/acpivar.h>
41 #include <dev/acpica/acpi_pcibvar.h>
42
43 #include <dev/pci/pcivar.h>
44 #include "pcib_if.h"
45
46 /* Hooks for the ACPI CA debugging infrastructure. */
47 #define _COMPONENT ACPI_BUS
48 ACPI_MODULE_NAME("PCI")
49
50 ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
51
52 /*
53 * For locking, we assume the caller is not concurrent since this is
54 * triggered by newbus methods.
55 */
56
57 struct prt_lookup_request {
58 ACPI_PCI_ROUTING_TABLE *pr_entry;
59 u_int pr_pin;
60 u_int pr_slot;
61 };
62
63 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
64
65 static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
66 static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
67 static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
68 void *arg);
69
70 static void
71 prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
72 {
73 ACPI_PCI_ROUTING_TABLE *entry;
74 char *prtptr;
75
76 /* First check to see if there is a table to walk. */
77 if (prt == NULL || prt->Pointer == NULL)
78 return;
79
80 /* Walk the table executing the handler function for each entry. */
81 prtptr = prt->Pointer;
82 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
83 while (entry->Length != 0) {
84 handler(entry, arg);
85 prtptr += entry->Length;
86 entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
87 }
88 }
89
90 static void
91 prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
92 {
93 ACPI_HANDLE handle;
94 device_t child, pcib;
95 int error;
96
97 /* We only care about entries that reference a link device. */
98 if (entry->Source[0] == '\0')
99 return;
100
101 /*
102 * In practice, we only see SourceIndex's of 0 out in the wild.
103 * When indices != 0 have been found, they've been bugs in the ASL.
104 */
105 if (entry->SourceIndex != 0)
106 return;
107
108 /* Lookup the associated handle and device. */
109 pcib = (device_t)arg;
110 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
111 return;
112 child = acpi_get_device(handle);
113 if (child == NULL)
114 return;
115
116 /* If the device hasn't been probed yet, force it to do so. */
117 error = device_probe_and_attach(child);
118 if (error != 0) {
119 device_printf(pcib, "failed to force attach of %s\n",
120 acpi_name(handle));
121 return;
122 }
123
124 /* Add a reference for a specific bus/device/pin tuple. */
125 acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
126 ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
127 }
128
129 int
130 acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
131 {
132 ACPI_STATUS status;
133 int error;
134
135 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
136
137 /*
138 * Get the PCI interrupt routing table for this bus. If we can't
139 * get it, this is not an error but may reduce functionality. There
140 * are several valid bridges in the field that do not have a _PRT, so
141 * only warn about missing tables if bootverbose is set.
142 */
143 prt->Length = ACPI_ALLOCATE_BUFFER;
144 status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
145 if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
146 device_printf(dev,
147 "could not get PCI interrupt routing table for %s - %s\n",
148 acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
149
150 /*
151 * Attach the PCI bus proper.
152 */
153 if (device_add_child(dev, "pci", busno) == NULL) {
154 device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
155 return_VALUE(ENXIO);
156 }
157
158 /*
159 * Now go scan the bus.
160 */
161 prt_walk_table(prt, prt_attach_devices, dev);
162
163 error = bus_generic_attach(dev);
164 return_VALUE(error);
165 }
166
167 static void
168 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
169 {
170 struct prt_lookup_request *pr;
171
172 pr = (struct prt_lookup_request *)arg;
173 if (pr->pr_entry != NULL)
174 return;
175
176 /*
177 * Compare the slot number (high word of Address) and pin number
178 * (note that ACPI uses 0 for INTA) to check for a match.
179 *
180 * Note that the low word of the Address field (function number)
181 * is required by the specification to be 0xffff. We don't risk
182 * checking it here.
183 */
184 if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
185 entry->Pin == pr->pr_pin)
186 pr->pr_entry = entry;
187 }
188
189 /*
190 * Route an interrupt for a child of the bridge.
191 */
192 int
193 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
194 ACPI_BUFFER *prtbuf)
195 {
196 ACPI_PCI_ROUTING_TABLE *prt;
197 struct prt_lookup_request pr;
198 ACPI_HANDLE lnkdev;
199 int interrupt;
200
201 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
202
203 interrupt = PCI_INVALID_IRQ;
204
205 /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
206 pin--;
207
208 ACPI_SERIAL_BEGIN(pcib);
209
210 /* Search for a matching entry in the routing table. */
211 pr.pr_entry = NULL;
212 pr.pr_pin = pin;
213 pr.pr_slot = pci_get_slot(dev);
214 prt_walk_table(prtbuf, prt_lookup_device, &pr);
215 if (pr.pr_entry == NULL) {
216 device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
217 pci_get_slot(dev), 'A' + pin);
218 goto out;
219 }
220 prt = pr.pr_entry;
221
222 if (bootverbose) {
223 device_printf(pcib, "matched entry for %d.%d.INT%c",
224 pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
225 if (prt->Source[0] != '\0')
226 printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
227 printf("\n");
228 }
229
230 /*
231 * If source is empty/NULL, the source index is a global IRQ number
232 * and it's hard-wired so we're done.
233 *
234 * XXX: If the source index is non-zero, ignore the source device and
235 * assume that this is a hard-wired entry.
236 */
237 if (prt->Source[0] == '\0' || prt->SourceIndex != 0) {
238 if (bootverbose)
239 device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
240 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
241 if (prt->SourceIndex) {
242 interrupt = prt->SourceIndex;
243 BUS_CONFIG_INTR(dev, interrupt, INTR_TRIGGER_LEVEL,
244 INTR_POLARITY_LOW);
245 } else
246 device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
247 goto out;
248 }
249
250 /*
251 * We have to find the source device (PCI interrupt link device).
252 */
253 if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
254 device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
255 prt->Source);
256 goto out;
257 }
258 interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
259 prt->SourceIndex);
260
261 if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
262 device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
263 pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
264
265 out:
266 ACPI_SERIAL_END(pcib);
267
268 return_VALUE(interrupt);
269 }
270
271 int
272 acpi_pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
273 {
274 device_t acpi_dev;
275
276 acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
277 acpi_device_pwr_for_sleep(acpi_dev, dev, pstate);
278 return (0);
279 }
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