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
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
27 * $FreeBSD: src/sys/dev/acpica/acpi_pcib_acpi.c,v 1.34 2004/05/30 20:08:23 phk Exp $
28 * $DragonFly: src/sys/dev/acpica5/acpi_pcib_acpi.c,v 1.5 2008/08/02 01:14:41 dillon Exp $
31 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
41 #include <bus/pci/pci_cfgreg.h>
42 #include <bus/pci/pcivar.h>
43 #include <bus/pci/pcib_private.h>
46 #include "acpi_pcibvar.h"
48 /* Hooks for the ACPI CA debugging infrastructure. */
49 #define _COMPONENT ACPI_BUS
50 ACPI_MODULE_NAME("PCI_ACPI")
52 struct acpi_hpcib_softc {
54 ACPI_HANDLE ap_handle;
56 int ap_segment; /* analagous to Alpha 'hose' */
57 int ap_bus; /* bios-assigned bus number */
59 ACPI_BUFFER ap_prt; /* interrupt routing table */
62 static int acpi_pcib_acpi_probe(device_t bus);
63 static int acpi_pcib_acpi_attach(device_t bus);
64 static int acpi_pcib_acpi_resume(device_t bus);
65 static int acpi_pcib_read_ivar(device_t dev, device_t child,
66 int which, uintptr_t *result);
67 static int acpi_pcib_write_ivar(device_t dev, device_t child,
68 int which, uintptr_t value);
69 static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot,
70 int func, int reg, int bytes);
71 static void acpi_pcib_write_config(device_t dev, int bus, int slot,
72 int func, int reg, uint32_t data, int bytes);
73 static int acpi_pcib_acpi_route_interrupt(device_t pcib,
74 device_t dev, int pin);
75 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
76 device_t child, int type, int *rid,
77 u_long start, u_long end, u_long count,
80 static device_method_t acpi_pcib_acpi_methods[] = {
81 /* Device interface */
82 DEVMETHOD(device_probe, acpi_pcib_acpi_probe),
83 DEVMETHOD(device_attach, acpi_pcib_acpi_attach),
84 DEVMETHOD(device_shutdown, bus_generic_shutdown),
85 DEVMETHOD(device_suspend, bus_generic_suspend),
86 DEVMETHOD(device_resume, acpi_pcib_acpi_resume),
89 DEVMETHOD(bus_print_child, bus_generic_print_child),
90 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar),
91 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar),
92 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource),
93 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
94 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
95 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
96 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
97 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
100 DEVMETHOD(pcib_maxslots, pcib_maxslots),
101 DEVMETHOD(pcib_read_config, acpi_pcib_read_config),
102 DEVMETHOD(pcib_write_config, acpi_pcib_write_config),
103 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt),
108 static driver_t acpi_pcib_acpi_driver = {
110 acpi_pcib_acpi_methods,
111 sizeof(struct acpi_hpcib_softc),
114 static devclass_t pcib_devclass;
116 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
117 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
120 acpi_pcib_acpi_probe(device_t dev)
123 if (acpi_get_type(dev) == ACPI_TYPE_DEVICE &&
124 acpi_enabled("pci") &&
125 acpi_MatchHid(acpi_get_handle(dev), "PNP0A03")) {
126 if (pci_cfgregopen() == 0)
128 device_set_desc(dev, "ACPI Host-PCI bridge");
135 acpi_pcib_acpi_attach(device_t dev)
137 struct acpi_hpcib_softc *sc;
139 u_int addr, slot, func, busok;
142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
144 sc = device_get_softc(dev);
146 sc->ap_handle = acpi_get_handle(dev);
149 * Get our base bus number by evaluating _BBN.
150 * If this doesn't work, we assume we're bus number 0.
152 * XXX note that it may also not exist in the case where we are
153 * meant to use a private configuration space mechanism for this bus,
154 * so we should dig out our resources and check to see if we have
155 * anything like that. How do we do this?
156 * XXX If we have the requisite information, and if we don't think the
157 * default PCI configuration space handlers can deal with this bus,
158 * we should attach our own handler.
159 * XXX invoke _REG on this for the PCI config space address space?
160 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
161 * _BBN correctly. They set _BBN to zero for all bridges. Thus,
162 * if _BBN is zero and pcib0 already exists, we try to read our
163 * bus number from the configuration registers at address _ADR.
165 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
166 if (ACPI_FAILURE(status)) {
167 if (status != AE_NOT_FOUND) {
168 device_printf(dev, "could not evaluate _BBN - %s\n",
169 AcpiFormatException(status));
170 return_VALUE (ENXIO);
172 /* If it's not found, assume 0. */
178 * If the bus is zero and pcib0 already exists, read the bus number
179 * via PCI config space.
182 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
184 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
185 if (ACPI_FAILURE(status)) {
186 if (status != AE_NOT_FOUND) {
187 device_printf(dev, "could not evaluate _ADR - %s\n",
188 AcpiFormatException(status));
189 return_VALUE (ENXIO);
191 device_printf(dev, "couldn't find _ADR\n");
193 /* XXX: We assume bus 0. */
195 func = addr & 0xffff;
197 device_printf(dev, "reading config registers from 0:%d:%d\n",
199 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
200 device_printf(dev, "couldn't read bus number from cfg space\n");
209 * If nothing else worked, hope that ACPI at least lays out the
210 * host-PCI bridges in order and that as a result our unit number
211 * is actually our bus number. There are several reasons this
215 sc->ap_bus = device_get_unit(dev);
216 device_printf(dev, "trying bus number %d\n", sc->ap_bus);
220 * Get our segment number by evaluating _SEG
221 * It's OK for this to not exist.
223 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
224 if (ACPI_FAILURE(status)) {
225 if (status != AE_NOT_FOUND) {
226 device_printf(dev, "could not evaluate _SEG - %s\n",
227 AcpiFormatException(status));
228 return_VALUE (ENXIO);
230 /* If it's not found, assume 0. */
234 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
238 acpi_pcib_acpi_resume(device_t dev)
240 struct acpi_hpcib_softc *sc = device_get_softc(dev);
242 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus));
246 * Support for standard PCI bridge ivars.
249 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
251 struct acpi_hpcib_softc *sc = device_get_softc(dev);
255 *result = sc->ap_bus;
257 case ACPI_IVAR_HANDLE:
258 *result = (uintptr_t)sc->ap_handle;
265 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
267 struct acpi_hpcib_softc *sc = device_get_softc(dev);
278 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
281 return (pci_cfgregread(bus, slot, func, reg, bytes));
285 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
286 uint32_t data, int bytes)
288 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
292 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
294 struct acpi_hpcib_softc *sc;
296 /* Find the bridge softc. */
297 sc = device_get_softc(pcib);
298 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
302 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
303 u_long start, u_long end, u_long count, u_int flags)
306 * If no memory preference is given, use upper 256MB slot most
307 * bioses use for their memory window. Typically other bridges
308 * before us get in the way to assert their preferences on memory.
309 * Hardcoding like this sucks, so a more MD/MI way needs to be
312 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
314 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,