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("$FreeBSD$");
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/rman.h>
38 #include <sys/sysctl.h>
39
40 #include <contrib/dev/acpica/include/acpi.h>
41 #include <contrib/dev/acpica/include/accommon.h>
42
43 #include <dev/acpica/acpivar.h>
44
45 #include <machine/pci_cfgreg.h>
46 #include <dev/pci/pcivar.h>
47 #include <dev/pci/pcib_private.h>
48 #include "pcib_if.h"
49
50 #include <dev/acpica/acpi_pcibvar.h>
51
52 /* Hooks for the ACPI CA debugging infrastructure. */
53 #define _COMPONENT ACPI_BUS
54 ACPI_MODULE_NAME("PCI_ACPI")
55
56 struct acpi_hpcib_softc {
57 device_t ap_dev;
58 ACPI_HANDLE ap_handle;
59 int ap_flags;
60
61 int ap_segment; /* PCI domain */
62 int ap_bus; /* bios-assigned bus number */
63 int ap_addr; /* device/func of PCI-Host bridge */
64
65 ACPI_BUFFER ap_prt; /* interrupt routing table */
66 };
67
68 static int acpi_pcib_acpi_probe(device_t bus);
69 static int acpi_pcib_acpi_attach(device_t bus);
70 static int acpi_pcib_read_ivar(device_t dev, device_t child,
71 int which, uintptr_t *result);
72 static int acpi_pcib_write_ivar(device_t dev, device_t child,
73 int which, uintptr_t value);
74 static uint32_t acpi_pcib_read_config(device_t dev, u_int bus,
75 u_int slot, u_int func, u_int reg, int bytes);
76 static void acpi_pcib_write_config(device_t dev, u_int bus,
77 u_int slot, u_int func, u_int reg, uint32_t data,
78 int bytes);
79 static int acpi_pcib_acpi_route_interrupt(device_t pcib,
80 device_t dev, int pin);
81 static int acpi_pcib_alloc_msi(device_t pcib, device_t dev,
82 int count, int maxcount, int *irqs);
83 static int acpi_pcib_map_msi(device_t pcib, device_t dev,
84 int irq, uint64_t *addr, uint32_t *data);
85 static int acpi_pcib_alloc_msix(device_t pcib, device_t dev,
86 int *irq);
87 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
88 device_t child, int type, int *rid,
89 u_long start, u_long end, u_long count,
90 u_int flags);
91
92 static device_method_t acpi_pcib_acpi_methods[] = {
93 /* Device interface */
94 DEVMETHOD(device_probe, acpi_pcib_acpi_probe),
95 DEVMETHOD(device_attach, acpi_pcib_acpi_attach),
96 DEVMETHOD(device_shutdown, bus_generic_shutdown),
97 DEVMETHOD(device_suspend, bus_generic_suspend),
98 DEVMETHOD(device_resume, bus_generic_resume),
99
100 /* Bus interface */
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_adjust_resource, bus_generic_adjust_resource),
105 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
106 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
107 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
108 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
109 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
110
111 /* pcib interface */
112 DEVMETHOD(pcib_maxslots, pcib_maxslots),
113 DEVMETHOD(pcib_read_config, acpi_pcib_read_config),
114 DEVMETHOD(pcib_write_config, acpi_pcib_write_config),
115 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt),
116 DEVMETHOD(pcib_alloc_msi, acpi_pcib_alloc_msi),
117 DEVMETHOD(pcib_release_msi, pcib_release_msi),
118 DEVMETHOD(pcib_alloc_msix, acpi_pcib_alloc_msix),
119 DEVMETHOD(pcib_release_msix, pcib_release_msix),
120 DEVMETHOD(pcib_map_msi, acpi_pcib_map_msi),
121
122 DEVMETHOD_END
123 };
124
125 static devclass_t pcib_devclass;
126
127 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods,
128 sizeof(struct acpi_hpcib_softc));
129 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
130 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
131
132 static int
133 acpi_pcib_acpi_probe(device_t dev)
134 {
135 ACPI_DEVICE_INFO *devinfo;
136 ACPI_HANDLE h;
137 int root;
138
139 if (acpi_disabled("pcib") || (h = acpi_get_handle(dev)) == NULL ||
140 ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
141 return (ENXIO);
142 root = (devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0;
143 AcpiOsFree(devinfo);
144 if (!root || pci_cfgregopen() == 0)
145 return (ENXIO);
146
147 device_set_desc(dev, "ACPI Host-PCI bridge");
148 return (0);
149 }
150
151 static int
152 acpi_pcib_acpi_attach(device_t dev)
153 {
154 struct acpi_hpcib_softc *sc;
155 ACPI_STATUS status;
156 static int bus0_seen = 0;
157 u_int slot, func, busok;
158 uint8_t busno;
159
160 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
161
162 sc = device_get_softc(dev);
163 sc->ap_dev = dev;
164 sc->ap_handle = acpi_get_handle(dev);
165
166 /*
167 * Don't attach if we're not really there.
168 */
169 if (!acpi_DeviceIsPresent(dev))
170 return (ENXIO);
171
172 /*
173 * Get our segment number by evaluating _SEG.
174 * It's OK for this to not exist.
175 */
176 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
177 if (ACPI_FAILURE(status)) {
178 if (status != AE_NOT_FOUND) {
179 device_printf(dev, "could not evaluate _SEG - %s\n",
180 AcpiFormatException(status));
181 return_VALUE (ENXIO);
182 }
183 /* If it's not found, assume 0. */
184 sc->ap_segment = 0;
185 }
186
187 /*
188 * Get the address (device and function) of the associated
189 * PCI-Host bridge device from _ADR. Assume we don't have one if
190 * it doesn't exist.
191 */
192 status = acpi_GetInteger(sc->ap_handle, "_ADR", &sc->ap_addr);
193 if (ACPI_FAILURE(status)) {
194 device_printf(dev, "could not evaluate _ADR - %s\n",
195 AcpiFormatException(status));
196 sc->ap_addr = -1;
197 }
198
199 /*
200 * Get our base bus number by evaluating _BBN.
201 * If this doesn't work, we assume we're bus number 0.
202 *
203 * XXX note that it may also not exist in the case where we are
204 * meant to use a private configuration space mechanism for this bus,
205 * so we should dig out our resources and check to see if we have
206 * anything like that. How do we do this?
207 * XXX If we have the requisite information, and if we don't think the
208 * default PCI configuration space handlers can deal with this bus,
209 * we should attach our own handler.
210 * XXX invoke _REG on this for the PCI config space address space?
211 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
212 * _BBN correctly. They set _BBN to zero for all bridges. Thus,
213 * if _BBN is zero and PCI bus 0 already exists, we try to read our
214 * bus number from the configuration registers at address _ADR.
215 * We only do this for domain/segment 0 in the hopes that this is
216 * only needed for old single-domain machines.
217 */
218 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
219 if (ACPI_FAILURE(status)) {
220 if (status != AE_NOT_FOUND) {
221 device_printf(dev, "could not evaluate _BBN - %s\n",
222 AcpiFormatException(status));
223 return (ENXIO);
224 } else {
225 /* If it's not found, assume 0. */
226 sc->ap_bus = 0;
227 }
228 }
229
230 /*
231 * If this is segment 0, the bus is zero, and PCI bus 0 already
232 * exists, read the bus number via PCI config space.
233 */
234 busok = 1;
235 if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
236 busok = 0;
237 if (sc->ap_addr != -1) {
238 /* XXX: We assume bus 0. */
239 slot = ACPI_ADR_PCI_SLOT(sc->ap_addr);
240 func = ACPI_ADR_PCI_FUNC(sc->ap_addr);
241 if (bootverbose)
242 device_printf(dev, "reading config registers from 0:%d:%d\n",
243 slot, func);
244 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
245 device_printf(dev, "couldn't read bus number from cfg space\n");
246 else {
247 sc->ap_bus = busno;
248 busok = 1;
249 }
250 }
251 }
252
253 /*
254 * If nothing else worked, hope that ACPI at least lays out the
255 * host-PCI bridges in order and that as a result our unit number
256 * is actually our bus number. There are several reasons this
257 * might not be true.
258 */
259 if (busok == 0) {
260 sc->ap_bus = device_get_unit(dev);
261 device_printf(dev, "trying bus number %d\n", sc->ap_bus);
262 }
263
264 /* If this is bus 0 on segment 0, note that it has been seen already. */
265 if (sc->ap_segment == 0 && sc->ap_bus == 0)
266 bus0_seen = 1;
267
268 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
269 }
270
271 /*
272 * Support for standard PCI bridge ivars.
273 */
274 static int
275 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
276 {
277 struct acpi_hpcib_softc *sc = device_get_softc(dev);
278
279 switch (which) {
280 case PCIB_IVAR_DOMAIN:
281 *result = 0;
282 return (0);
283 case PCIB_IVAR_BUS:
284 *result = sc->ap_bus;
285 return (0);
286 case ACPI_IVAR_HANDLE:
287 *result = (uintptr_t)sc->ap_handle;
288 return (0);
289 case ACPI_IVAR_FLAGS:
290 *result = (uintptr_t)sc->ap_flags;
291 return (0);
292 }
293 return (ENOENT);
294 }
295
296 static int
297 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
298 {
299 struct acpi_hpcib_softc *sc = device_get_softc(dev);
300
301 switch (which) {
302 case PCIB_IVAR_DOMAIN:
303 return (EINVAL);
304 case PCIB_IVAR_BUS:
305 sc->ap_bus = value;
306 return (0);
307 case ACPI_IVAR_HANDLE:
308 sc->ap_handle = (ACPI_HANDLE)value;
309 return (0);
310 case ACPI_IVAR_FLAGS:
311 sc->ap_flags = (int)value;
312 return (0);
313 }
314 return (ENOENT);
315 }
316
317 static uint32_t
318 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func,
319 u_int reg, int bytes)
320 {
321 return (pci_cfgregread(bus, slot, func, reg, bytes));
322 }
323
324 static void
325 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func,
326 u_int reg, uint32_t data, int bytes)
327 {
328 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
329 }
330
331 static int
332 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
333 {
334 struct acpi_hpcib_softc *sc = device_get_softc(pcib);
335
336 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
337 }
338
339 static int
340 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
341 int *irqs)
342 {
343 device_t bus;
344
345 bus = device_get_parent(pcib);
346 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
347 irqs));
348 }
349
350 static int
351 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
352 {
353 device_t bus;
354
355 bus = device_get_parent(pcib);
356 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
357 }
358
359 static int
360 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
361 uint32_t *data)
362 {
363 struct acpi_hpcib_softc *sc;
364 device_t bus, hostb;
365 int error;
366
367 bus = device_get_parent(pcib);
368 error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
369 if (error)
370 return (error);
371
372 sc = device_get_softc(dev);
373 if (sc->ap_addr == -1)
374 return (0);
375 /* XXX: Assumes all bridges are on bus 0. */
376 hostb = pci_find_dbsf(sc->ap_segment, 0, ACPI_ADR_PCI_SLOT(sc->ap_addr),
377 ACPI_ADR_PCI_FUNC(sc->ap_addr));
378 if (hostb != NULL)
379 pci_ht_map_msi(hostb, *addr);
380 return (0);
381 }
382
383 static u_long acpi_host_mem_start = 0x80000000;
384 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
385
386 struct resource *
387 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
388 u_long start, u_long end, u_long count, u_int flags)
389 {
390 /*
391 * If no memory preference is given, use upper 32MB slot most
392 * bioses use for their memory window. Typically other bridges
393 * before us get in the way to assert their preferences on memory.
394 * Hardcoding like this sucks, so a more MD/MI way needs to be
395 * found to do it. This is typically only used on older laptops
396 * that don't have pci busses behind pci bridge, so assuming > 32MB
397 * is likely OK.
398 *
399 * PCI-PCI bridges may allocate smaller ranges for their windows,
400 * but the heuristics here should apply to those, so we allow
401 * several different end addresses.
402 */
403 if (type == SYS_RES_MEMORY && start == 0UL && (end == ~0UL ||
404 end == 0xffffffff))
405 start = acpi_host_mem_start;
406 if (type == SYS_RES_IOPORT && start == 0UL && (end == ~0UL ||
407 end == 0xffff || end == 0xffffffff))
408 start = 0x1000;
409 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
410 count, flags));
411 }
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