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/8.1/sys/dev/acpica/acpi_pcib_acpi.c 203544 2010-02-06 12:03:25Z avg $");
30
31 #include "opt_acpi.h"
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/sysctl.h>
38
39 #include <contrib/dev/acpica/include/acpi.h>
40 #include <contrib/dev/acpica/include/accommon.h>
41
42 #include <dev/acpica/acpivar.h>
43
44 #include <machine/pci_cfgreg.h>
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pcib_private.h>
47 #include "pcib_if.h"
48
49 #include <dev/acpica/acpi_pcibvar.h>
50
51 /* Hooks for the ACPI CA debugging infrastructure. */
52 #define _COMPONENT ACPI_BUS
53 ACPI_MODULE_NAME("PCI_ACPI")
54
55 struct acpi_hpcib_softc {
56 device_t ap_dev;
57 ACPI_HANDLE ap_handle;
58 int ap_flags;
59
60 int ap_segment; /* analagous to Alpha 'hose' */
61 int ap_bus; /* bios-assigned bus number */
62
63 ACPI_BUFFER ap_prt; /* interrupt routing table */
64 };
65
66 static int acpi_pcib_acpi_probe(device_t bus);
67 static int acpi_pcib_acpi_attach(device_t bus);
68 static int acpi_pcib_acpi_resume(device_t bus);
69 static int acpi_pcib_read_ivar(device_t dev, device_t child,
70 int which, uintptr_t *result);
71 static int acpi_pcib_write_ivar(device_t dev, device_t child,
72 int which, uintptr_t value);
73 static uint32_t acpi_pcib_read_config(device_t dev, u_int bus,
74 u_int slot, u_int func, u_int reg, int bytes);
75 static void acpi_pcib_write_config(device_t dev, u_int bus,
76 u_int slot, u_int func, u_int reg, uint32_t data,
77 int bytes);
78 static int acpi_pcib_acpi_route_interrupt(device_t pcib,
79 device_t dev, int pin);
80 static int acpi_pcib_alloc_msi(device_t pcib, device_t dev,
81 int count, int maxcount, int *irqs);
82 static int acpi_pcib_map_msi(device_t pcib, device_t dev,
83 int irq, uint64_t *addr, uint32_t *data);
84 static int acpi_pcib_alloc_msix(device_t pcib, device_t dev,
85 int *irq);
86 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
87 device_t child, int type, int *rid,
88 u_long start, u_long end, u_long count,
89 u_int flags);
90
91 static device_method_t acpi_pcib_acpi_methods[] = {
92 /* Device interface */
93 DEVMETHOD(device_probe, acpi_pcib_acpi_probe),
94 DEVMETHOD(device_attach, acpi_pcib_acpi_attach),
95 DEVMETHOD(device_shutdown, bus_generic_shutdown),
96 DEVMETHOD(device_suspend, bus_generic_suspend),
97 DEVMETHOD(device_resume, acpi_pcib_acpi_resume),
98
99 /* Bus interface */
100 DEVMETHOD(bus_print_child, bus_generic_print_child),
101 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar),
102 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar),
103 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource),
104 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
105 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
106 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
107 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
108 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
109
110 /* pcib interface */
111 DEVMETHOD(pcib_maxslots, pcib_maxslots),
112 DEVMETHOD(pcib_read_config, acpi_pcib_read_config),
113 DEVMETHOD(pcib_write_config, acpi_pcib_write_config),
114 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt),
115 DEVMETHOD(pcib_alloc_msi, acpi_pcib_alloc_msi),
116 DEVMETHOD(pcib_release_msi, pcib_release_msi),
117 DEVMETHOD(pcib_alloc_msix, acpi_pcib_alloc_msix),
118 DEVMETHOD(pcib_release_msix, pcib_release_msix),
119 DEVMETHOD(pcib_map_msi, acpi_pcib_map_msi),
120
121 {0, 0}
122 };
123
124 static devclass_t pcib_devclass;
125
126 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods,
127 sizeof(struct acpi_hpcib_softc));
128 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
129 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
130
131 static int
132 acpi_pcib_acpi_probe(device_t dev)
133 {
134 ACPI_DEVICE_INFO *devinfo;
135 ACPI_HANDLE h;
136 int root;
137
138 if (acpi_disabled("pcib") || (h = acpi_get_handle(dev)) == NULL ||
139 ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
140 return (ENXIO);
141 root = (devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0;
142 AcpiOsFree(devinfo);
143 if (!root || pci_cfgregopen() == 0)
144 return (ENXIO);
145
146 device_set_desc(dev, "ACPI Host-PCI bridge");
147 return (0);
148 }
149
150 static int
151 acpi_pcib_acpi_attach(device_t dev)
152 {
153 struct acpi_hpcib_softc *sc;
154 ACPI_STATUS status;
155 static int bus0_seen = 0;
156 u_int addr, slot, func, busok;
157 uint8_t busno;
158
159 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
160
161 sc = device_get_softc(dev);
162 sc->ap_dev = dev;
163 sc->ap_handle = acpi_get_handle(dev);
164
165 /*
166 * Get our segment number by evaluating _SEG
167 * It's OK for this to not exist.
168 */
169 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
170 if (ACPI_FAILURE(status)) {
171 if (status != AE_NOT_FOUND) {
172 device_printf(dev, "could not evaluate _SEG - %s\n",
173 AcpiFormatException(status));
174 return_VALUE (ENXIO);
175 }
176 /* If it's not found, assume 0. */
177 sc->ap_segment = 0;
178 }
179
180 /*
181 * Get our base bus number by evaluating _BBN.
182 * If this doesn't work, we assume we're bus number 0.
183 *
184 * XXX note that it may also not exist in the case where we are
185 * meant to use a private configuration space mechanism for this bus,
186 * so we should dig out our resources and check to see if we have
187 * anything like that. How do we do this?
188 * XXX If we have the requisite information, and if we don't think the
189 * default PCI configuration space handlers can deal with this bus,
190 * we should attach our own handler.
191 * XXX invoke _REG on this for the PCI config space address space?
192 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
193 * _BBN correctly. They set _BBN to zero for all bridges. Thus,
194 * if _BBN is zero and PCI bus 0 already exists, we try to read our
195 * bus number from the configuration registers at address _ADR.
196 * We only do this for domain/segment 0 in the hopes that this is
197 * only needed for old single-domain machines.
198 */
199 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
200 if (ACPI_FAILURE(status)) {
201 if (status != AE_NOT_FOUND) {
202 device_printf(dev, "could not evaluate _BBN - %s\n",
203 AcpiFormatException(status));
204 return_VALUE (ENXIO);
205 } else {
206 /* If it's not found, assume 0. */
207 sc->ap_bus = 0;
208 }
209 }
210
211 /*
212 * If this is segment 0, the bus is zero, and PCI bus 0 already
213 * exists, read the bus number via PCI config space.
214 */
215 busok = 1;
216 if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
217 busok = 0;
218 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
219 if (ACPI_FAILURE(status)) {
220 if (status != AE_NOT_FOUND) {
221 device_printf(dev, "could not evaluate _ADR - %s\n",
222 AcpiFormatException(status));
223 return_VALUE (ENXIO);
224 } else
225 device_printf(dev, "couldn't find _ADR\n");
226 } else {
227 /* XXX: We assume bus 0. */
228 slot = ACPI_ADR_PCI_SLOT(addr);
229 func = ACPI_ADR_PCI_FUNC(addr);
230 if (bootverbose)
231 device_printf(dev, "reading config registers from 0:%d:%d\n",
232 slot, func);
233 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
234 device_printf(dev, "couldn't read bus number from cfg space\n");
235 else {
236 sc->ap_bus = busno;
237 busok = 1;
238 }
239 }
240 }
241
242 /*
243 * If nothing else worked, hope that ACPI at least lays out the
244 * host-PCI bridges in order and that as a result our unit number
245 * is actually our bus number. There are several reasons this
246 * might not be true.
247 */
248 if (busok == 0) {
249 sc->ap_bus = device_get_unit(dev);
250 device_printf(dev, "trying bus number %d\n", sc->ap_bus);
251 }
252
253 /* If this is bus 0 on segment 0, note that it has been seen already. */
254 if (sc->ap_segment == 0 && sc->ap_bus == 0)
255 bus0_seen = 1;
256
257 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
258 }
259
260 static int
261 acpi_pcib_acpi_resume(device_t dev)
262 {
263
264 return (acpi_pcib_resume(dev));
265 }
266
267 /*
268 * Support for standard PCI bridge ivars.
269 */
270 static int
271 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
272 {
273 struct acpi_hpcib_softc *sc = device_get_softc(dev);
274
275 switch (which) {
276 case PCIB_IVAR_DOMAIN:
277 *result = 0;
278 return (0);
279 case PCIB_IVAR_BUS:
280 *result = sc->ap_bus;
281 return (0);
282 case ACPI_IVAR_HANDLE:
283 *result = (uintptr_t)sc->ap_handle;
284 return (0);
285 case ACPI_IVAR_FLAGS:
286 *result = (uintptr_t)sc->ap_flags;
287 return (0);
288 }
289 return (ENOENT);
290 }
291
292 static int
293 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
294 {
295 struct acpi_hpcib_softc *sc = device_get_softc(dev);
296
297 switch (which) {
298 case PCIB_IVAR_DOMAIN:
299 return (EINVAL);
300 case PCIB_IVAR_BUS:
301 sc->ap_bus = value;
302 return (0);
303 case ACPI_IVAR_HANDLE:
304 sc->ap_handle = (ACPI_HANDLE)value;
305 return (0);
306 case ACPI_IVAR_FLAGS:
307 sc->ap_flags = (int)value;
308 return (0);
309 }
310 return (ENOENT);
311 }
312
313 static uint32_t
314 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func,
315 u_int reg, int bytes)
316 {
317 return (pci_cfgregread(bus, slot, func, reg, bytes));
318 }
319
320 static void
321 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func,
322 u_int reg, uint32_t data, int bytes)
323 {
324 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
325 }
326
327 static int
328 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
329 {
330 struct acpi_hpcib_softc *sc = device_get_softc(pcib);
331
332 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
333 }
334
335 static int
336 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
337 int *irqs)
338 {
339 device_t bus;
340
341 bus = device_get_parent(pcib);
342 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
343 irqs));
344 }
345
346 static int
347 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
348 {
349 device_t bus;
350
351 bus = device_get_parent(pcib);
352 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
353 }
354
355 static int
356 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
357 uint32_t *data)
358 {
359 device_t bus;
360
361 bus = device_get_parent(pcib);
362 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
363 }
364
365 static u_long acpi_host_mem_start = 0x80000000;
366 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
367
368 struct resource *
369 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
370 u_long start, u_long end, u_long count, u_int flags)
371 {
372 /*
373 * If no memory preference is given, use upper 32MB slot most
374 * bioses use for their memory window. Typically other bridges
375 * before us get in the way to assert their preferences on memory.
376 * Hardcoding like this sucks, so a more MD/MI way needs to be
377 * found to do it. This is typically only used on older laptops
378 * that don't have pci busses behind pci bridge, so assuming > 32MB
379 * is liekly OK.
380 */
381 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
382 start = acpi_host_mem_start;
383 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL)
384 start = 0x1000;
385 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
386 count, flags));
387 }
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