2 * Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $FreeBSD: src/sys/dev/pci/vga_pci.c,v 1.5.8.1 2009/04/15 03:14:26 kensmith Exp $
33 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and
34 * drm(4) should attach as children of this device.
36 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver
40 #include <sys/param.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
45 #include <sys/sysctl.h>
46 #include <sys/systm.h>
48 #include <machine/pmap.h>
50 #include <bus/pci/pcireg.h>
51 #include <bus/pci/pcivar.h>
54 struct resource *vr_res;
58 struct vga_pci_softc {
59 device_t vga_msi_child; /* Child driver using MSI. */
60 struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1];
61 struct vga_resource vga_bios;
66 static struct vga_resource *lookup_res(struct vga_pci_softc *sc, int rid);
67 static struct resource *vga_pci_alloc_resource(device_t dev, device_t child,
68 int type, int *rid, u_long start, u_long end, u_long count, u_int flags,
70 static int vga_pci_release_resource(device_t dev, device_t child, int type,
71 int rid, struct resource *r);
73 int vga_pci_default_unit = -1;
74 TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit);
75 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RD,
76 &vga_pci_default_unit, -1, "Default VGA-compatible display");
79 vga_pci_is_boot_display(device_t dev)
85 /* Check that the given device is a video card */
86 if ((pci_get_class(dev) != PCIC_DISPLAY &&
87 (pci_get_class(dev) != PCIC_OLD ||
88 pci_get_subclass(dev) != PCIS_OLD_VGA)))
91 unit = device_get_unit(dev);
93 if (vga_pci_default_unit >= 0) {
95 * The boot display device was determined by a previous
96 * call to this function, or the user forced it using
97 * the hw.pci.default_vgapci_unit tunable.
99 return (vga_pci_default_unit == unit);
103 * The primary video card used as a boot display must have the
104 * "I/O" and "Memory Address Space Decoding" bits set in its
107 * Furthermore, if the card is attached to a bridge, instead of
108 * the root PCI bus, the bridge must have the "VGA Enable" bit
109 * set in its Control register.
112 pcib = device_get_parent(device_get_parent(dev));
113 if (device_get_devclass(device_get_parent(pcib)) ==
114 devclass_find("pci")) {
116 * The parent bridge is a PCI-to-PCI bridge: check the
117 * value of the "VGA Enable" bit.
119 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
120 if ((config & PCIB_BCR_VGA_ENABLE) == 0)
124 config = pci_read_config(dev, PCIR_COMMAND, 2);
125 if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0)
128 /* This video card is the boot display: record its unit number. */
129 vga_pci_default_unit = unit;
130 device_set_flags(dev, 1);
136 vga_pci_map_bios(device_t dev, size_t *size)
139 struct resource *res;
141 if (vga_pci_is_boot_display(dev)) {
143 * On x86, the System BIOS copy the default display
144 * device's Video BIOS at a fixed location in system
145 * memory (0xC0000, 128 kBytes long) at boot time.
147 * We use this copy for the default boot device, because
148 * the original ROM may not be valid after boot.
151 *size = VGA_PCI_BIOS_SHADOW_SIZE;
152 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size));
156 res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0ul,
157 ~0ul, 1, RF_ACTIVE, -1);
162 *size = rman_get_size(res);
163 return (rman_get_virtual(res));
167 vga_pci_unmap_bios(device_t dev, void *bios)
169 struct vga_resource *vr;
175 if (vga_pci_is_boot_display(dev)) {
176 /* We mapped the BIOS shadow copy located at 0xC0000. */
177 pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE);
183 * Look up the PCIR_BIOS resource in our softc. It should match
184 * the address we returned previously.
186 vr = lookup_res(device_get_softc(dev), PCIR_BIOS);
187 KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped"));
188 KASSERT(rman_get_virtual(vr->vr_res) == bios,
189 ("vga_pci_unmap_bios: mismatch"));
190 vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, PCIR_BIOS,
195 vga_pci_probe(device_t dev)
198 switch (pci_get_class(dev)) {
202 if (pci_get_subclass(dev) != PCIS_OLD_VGA)
209 /* Probe default display. */
210 vga_pci_is_boot_display(dev);
212 device_set_desc(dev, "VGA-compatible display");
213 return (BUS_PROBE_GENERIC);
217 vga_pci_attach(device_t dev)
220 bus_generic_probe(dev);
222 /* Always create a drm child for now to make it easier on drm. */
223 device_add_child(dev, "drm", -1);
224 bus_generic_attach(dev);
226 if (vga_pci_is_boot_display(dev))
227 device_printf(dev, "Boot video device\n");
233 vga_pci_suspend(device_t dev)
236 return (bus_generic_suspend(dev));
240 vga_pci_resume(device_t dev)
243 return (bus_generic_resume(dev));
249 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
252 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
256 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
263 vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq,
264 int flags, driver_intr_t *intr, void *arg, void **cookiep,
265 lwkt_serialize_t serializer, const char *desc)
268 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags,
269 intr, arg, cookiep, serializer, desc));
273 vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
277 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie));
280 static struct vga_resource *
281 lookup_res(struct vga_pci_softc *sc, int rid)
285 if (rid == PCIR_BIOS)
286 return (&sc->vga_bios);
287 bar = PCI_RID2BAR(rid);
288 if (bar >= 0 && bar <= PCIR_MAX_BAR_0)
289 return (&sc->vga_bars[bar]);
293 static struct resource *
294 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
295 u_long start, u_long end, u_long count, u_int flags, int cpuid __unused)
297 struct vga_resource *vr;
303 * For BARs, we cache the resource so that we only allocate it
304 * from the PCI bus once.
306 vr = lookup_res(device_get_softc(dev), *rid);
309 if (vr->vr_res == NULL)
310 vr->vr_res = bus_alloc_resource(dev, type, rid, start,
312 if (vr->vr_res != NULL)
316 return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
320 vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
323 struct vga_resource *vr;
329 * Stop caching the resource when refs drops to 0
331 vr = lookup_res(device_get_softc(dev), rid);
332 if (vr && vr->vr_refs > 0) {
333 if (--vr->vr_refs > 0)
341 return (bus_release_resource(dev, type, rid, r));
347 vga_pci_read_config(device_t dev, device_t child, int reg, int width)
350 return (pci_read_config(dev, reg, width));
354 vga_pci_write_config(device_t dev, device_t child, int reg,
355 uint32_t val, int width)
358 pci_write_config(dev, reg, val, width);
362 vga_pci_enable_busmaster(device_t dev, device_t child)
365 return (pci_enable_busmaster(dev));
369 vga_pci_disable_busmaster(device_t dev, device_t child)
372 return (pci_disable_busmaster(dev));
376 vga_pci_enable_io(device_t dev, device_t child, int space)
379 device_printf(dev, "child %s requested pci_enable_io\n",
380 device_get_nameunit(child));
381 return (pci_enable_io(dev, space));
385 vga_pci_disable_io(device_t dev, device_t child, int space)
388 device_printf(dev, "child %s requested pci_disable_io\n",
389 device_get_nameunit(child));
390 return (pci_disable_io(dev, space));
394 vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr)
397 return (pci_get_vpd_ident(dev, identptr));
401 vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw,
405 return (pci_get_vpd_readonly(dev, kw, vptr));
409 vga_pci_set_powerstate(device_t dev, device_t child, int state)
412 return (pci_set_powerstate(dev, state));
416 vga_pci_get_powerstate(device_t dev, device_t child)
419 return (pci_get_powerstate(dev));
423 vga_pci_assign_interrupt(device_t dev, device_t child)
426 device_printf(dev, "child %s requested pci_assign_interrupt\n",
427 device_get_nameunit(child));
428 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
432 vga_pci_find_extcap(device_t dev, device_t child, int capability,
436 return (pci_find_extcap(dev, capability, capreg));
440 vga_pci_alloc_msi(device_t dev, device_t child, int *rid, int count,
443 struct vga_pci_softc *sc;
446 sc = device_get_softc(dev);
447 if (sc->vga_msi_child != NULL)
449 error = pci_alloc_msi(dev, rid, count, cpuid);
451 sc->vga_msi_child = child;
456 vga_pci_release_msi(device_t dev, device_t child)
458 struct vga_pci_softc *sc;
461 sc = device_get_softc(dev);
462 if (sc->vga_msi_child != child)
464 error = pci_release_msi(dev);
466 sc->vga_msi_child = NULL;
471 vga_pci_msi_count(device_t dev, device_t child)
474 return (pci_msi_count(dev));
477 static device_method_t vga_pci_methods[] = {
478 /* Device interface */
479 DEVMETHOD(device_probe, vga_pci_probe),
480 DEVMETHOD(device_attach, vga_pci_attach),
481 DEVMETHOD(device_shutdown, bus_generic_shutdown),
482 DEVMETHOD(device_suspend, vga_pci_suspend),
483 DEVMETHOD(device_resume, vga_pci_resume),
486 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar),
487 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar),
488 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr),
489 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr),
491 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource),
492 DEVMETHOD(bus_release_resource, vga_pci_release_resource),
493 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
494 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
497 DEVMETHOD(pci_read_config, vga_pci_read_config),
498 DEVMETHOD(pci_write_config, vga_pci_write_config),
499 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
500 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
501 DEVMETHOD(pci_enable_io, vga_pci_enable_io),
502 DEVMETHOD(pci_disable_io, vga_pci_disable_io),
503 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident),
504 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly),
505 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate),
506 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate),
507 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
508 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap),
509 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi),
510 DEVMETHOD(pci_release_msi, vga_pci_release_msi),
511 DEVMETHOD(pci_msi_count, vga_pci_msi_count),
516 static driver_t vga_pci_driver = {
519 sizeof(struct vga_pci_softc),
522 static devclass_t vga_devclass;
524 DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, NULL, NULL);