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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and
35 * drm(4) should attach as children of this device.
37 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver
41 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/module.h>
46 #include <sys/sysctl.h>
47 #include <sys/systm.h>
49 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
54 #include <dev/pci/pcireg.h>
55 #include <dev/pci/pcivar.h>
58 struct resource *vr_res;
62 struct vga_pci_softc {
63 device_t vga_msi_child; /* Child driver using MSI. */
64 struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1];
65 struct vga_resource vga_bios;
70 static struct vga_resource *lookup_res(struct vga_pci_softc *sc, int rid);
71 static struct resource *vga_pci_alloc_resource(device_t dev, device_t child,
72 int type, int *rid, u_long start, u_long end, u_long count, u_int flags);
73 static int vga_pci_release_resource(device_t dev, device_t child, int type,
74 int rid, struct resource *r);
76 int vga_pci_default_unit = -1;
77 TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit);
78 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN,
79 &vga_pci_default_unit, -1, "Default VGA-compatible display");
82 vga_pci_is_boot_display(device_t dev)
88 /* Check that the given device is a video card */
89 if ((pci_get_class(dev) != PCIC_DISPLAY &&
90 (pci_get_class(dev) != PCIC_OLD ||
91 pci_get_subclass(dev) != PCIS_OLD_VGA)))
94 unit = device_get_unit(dev);
96 if (vga_pci_default_unit >= 0) {
98 * The boot display device was determined by a previous
99 * call to this function, or the user forced it using
100 * the hw.pci.default_vgapci_unit tunable.
102 return (vga_pci_default_unit == unit);
106 * The primary video card used as a boot display must have the
107 * "I/O" and "Memory Address Space Decoding" bits set in its
110 * Furthermore, if the card is attached to a bridge, instead of
111 * the root PCI bus, the bridge must have the "VGA Enable" bit
112 * set in its Control register.
115 pcib = device_get_parent(device_get_parent(dev));
116 if (device_get_devclass(device_get_parent(pcib)) ==
117 devclass_find("pci")) {
119 * The parent bridge is a PCI-to-PCI bridge: check the
120 * value of the "VGA Enable" bit.
122 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
123 if ((config & PCIB_BCR_VGA_ENABLE) == 0)
127 config = pci_read_config(dev, PCIR_COMMAND, 2);
128 if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0)
131 /* This video card is the boot display: record its unit number. */
132 vga_pci_default_unit = unit;
133 device_set_flags(dev, 1);
139 vga_pci_map_bios(device_t dev, size_t *size)
142 struct resource *res;
144 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
145 if (vga_pci_is_boot_display(dev)) {
147 * On x86, the System BIOS copy the default display
148 * device's Video BIOS at a fixed location in system
149 * memory (0xC0000, 128 kBytes long) at boot time.
151 * We use this copy for the default boot device, because
152 * the original ROM may not be valid after boot.
155 *size = VGA_PCI_BIOS_SHADOW_SIZE;
156 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size));
161 res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0ul,
167 *size = rman_get_size(res);
168 return (rman_get_virtual(res));
172 vga_pci_unmap_bios(device_t dev, void *bios)
174 struct vga_resource *vr;
180 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
181 if (vga_pci_is_boot_display(dev)) {
182 /* We mapped the BIOS shadow copy located at 0xC0000. */
183 pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE);
190 * Look up the PCIR_BIOS resource in our softc. It should match
191 * the address we returned previously.
193 vr = lookup_res(device_get_softc(dev), PCIR_BIOS);
194 KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped"));
195 KASSERT(rman_get_virtual(vr->vr_res) == bios,
196 ("vga_pci_unmap_bios: mismatch"));
197 vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, PCIR_BIOS,
202 vga_pci_probe(device_t dev)
205 switch (pci_get_class(dev)) {
209 if (pci_get_subclass(dev) != PCIS_OLD_VGA)
216 /* Probe default display. */
217 vga_pci_is_boot_display(dev);
219 device_set_desc(dev, "VGA-compatible display");
220 return (BUS_PROBE_GENERIC);
224 vga_pci_attach(device_t dev)
227 bus_generic_probe(dev);
229 /* Always create a drm child for now to make it easier on drm. */
230 device_add_child(dev, "drm", -1);
231 device_add_child(dev, "drmn", -1);
232 bus_generic_attach(dev);
234 if (vga_pci_is_boot_display(dev))
235 device_printf(dev, "Boot video device\n");
241 vga_pci_suspend(device_t dev)
244 return (bus_generic_suspend(dev));
248 vga_pci_resume(device_t dev)
251 return (bus_generic_resume(dev));
257 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
260 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
264 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
271 vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq,
272 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg,
275 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags,
276 filter, intr, arg, cookiep));
280 vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
283 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie));
286 static struct vga_resource *
287 lookup_res(struct vga_pci_softc *sc, int rid)
291 if (rid == PCIR_BIOS)
292 return (&sc->vga_bios);
293 bar = PCI_RID2BAR(rid);
294 if (bar >= 0 && bar <= PCIR_MAX_BAR_0)
295 return (&sc->vga_bars[bar]);
299 static struct resource *
300 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
301 u_long start, u_long end, u_long count, u_int flags)
303 struct vga_resource *vr;
309 * For BARs, we cache the resource so that we only allocate it
310 * from the PCI bus once.
312 vr = lookup_res(device_get_softc(dev), *rid);
315 if (vr->vr_res == NULL)
316 vr->vr_res = bus_alloc_resource(dev, type, rid, start,
318 if (vr->vr_res != NULL)
322 return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
326 vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
329 struct vga_resource *vr;
336 * For BARs, we release the resource from the PCI bus
337 * when the last child reference goes away.
339 vr = lookup_res(device_get_softc(dev), rid);
342 if (vr->vr_res == NULL)
344 KASSERT(vr->vr_res == r, ("vga_pci resource mismatch"));
345 if (vr->vr_refs > 1) {
349 KASSERT(vr->vr_refs > 0,
350 ("vga_pci resource reference count underflow"));
351 error = bus_release_resource(dev, type, rid, r);
359 return (bus_release_resource(dev, type, rid, r));
365 vga_pci_read_config(device_t dev, device_t child, int reg, int width)
368 return (pci_read_config(dev, reg, width));
372 vga_pci_write_config(device_t dev, device_t child, int reg,
373 uint32_t val, int width)
376 pci_write_config(dev, reg, val, width);
380 vga_pci_enable_busmaster(device_t dev, device_t child)
383 return (pci_enable_busmaster(dev));
387 vga_pci_disable_busmaster(device_t dev, device_t child)
390 return (pci_disable_busmaster(dev));
394 vga_pci_enable_io(device_t dev, device_t child, int space)
397 device_printf(dev, "child %s requested pci_enable_io\n",
398 device_get_nameunit(child));
399 return (pci_enable_io(dev, space));
403 vga_pci_disable_io(device_t dev, device_t child, int space)
406 device_printf(dev, "child %s requested pci_disable_io\n",
407 device_get_nameunit(child));
408 return (pci_disable_io(dev, space));
412 vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr)
415 return (pci_get_vpd_ident(dev, identptr));
419 vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw,
423 return (pci_get_vpd_readonly(dev, kw, vptr));
427 vga_pci_set_powerstate(device_t dev, device_t child, int state)
430 device_printf(dev, "child %s requested pci_set_powerstate\n",
431 device_get_nameunit(child));
432 return (pci_set_powerstate(dev, state));
436 vga_pci_get_powerstate(device_t dev, device_t child)
439 device_printf(dev, "child %s requested pci_get_powerstate\n",
440 device_get_nameunit(child));
441 return (pci_get_powerstate(dev));
445 vga_pci_assign_interrupt(device_t dev, device_t child)
448 device_printf(dev, "child %s requested pci_assign_interrupt\n",
449 device_get_nameunit(child));
450 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
454 vga_pci_find_cap(device_t dev, device_t child, int capability,
458 return (pci_find_cap(dev, capability, capreg));
462 vga_pci_find_extcap(device_t dev, device_t child, int capability,
466 return (pci_find_extcap(dev, capability, capreg));
470 vga_pci_find_htcap(device_t dev, device_t child, int capability,
474 return (pci_find_htcap(dev, capability, capreg));
478 vga_pci_alloc_msi(device_t dev, device_t child, int *count)
480 struct vga_pci_softc *sc;
483 sc = device_get_softc(dev);
484 if (sc->vga_msi_child != NULL)
486 error = pci_alloc_msi(dev, count);
488 sc->vga_msi_child = child;
493 vga_pci_alloc_msix(device_t dev, device_t child, int *count)
495 struct vga_pci_softc *sc;
498 sc = device_get_softc(dev);
499 if (sc->vga_msi_child != NULL)
501 error = pci_alloc_msix(dev, count);
503 sc->vga_msi_child = child;
508 vga_pci_remap_msix(device_t dev, device_t child, int count,
509 const u_int *vectors)
511 struct vga_pci_softc *sc;
513 sc = device_get_softc(dev);
514 if (sc->vga_msi_child != child)
516 return (pci_remap_msix(dev, count, vectors));
520 vga_pci_release_msi(device_t dev, device_t child)
522 struct vga_pci_softc *sc;
525 sc = device_get_softc(dev);
526 if (sc->vga_msi_child != child)
528 error = pci_release_msi(dev);
530 sc->vga_msi_child = NULL;
535 vga_pci_msi_count(device_t dev, device_t child)
538 return (pci_msi_count(dev));
542 vga_pci_msix_count(device_t dev, device_t child)
545 return (pci_msix_count(dev));
549 vga_pci_get_dma_tag(device_t bus, device_t child)
552 return (bus_get_dma_tag(bus));
555 static device_method_t vga_pci_methods[] = {
556 /* Device interface */
557 DEVMETHOD(device_probe, vga_pci_probe),
558 DEVMETHOD(device_attach, vga_pci_attach),
559 DEVMETHOD(device_shutdown, bus_generic_shutdown),
560 DEVMETHOD(device_suspend, vga_pci_suspend),
561 DEVMETHOD(device_resume, vga_pci_resume),
564 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar),
565 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar),
566 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr),
567 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr),
568 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource),
569 DEVMETHOD(bus_release_resource, vga_pci_release_resource),
570 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
571 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
572 DEVMETHOD(bus_get_dma_tag, vga_pci_get_dma_tag),
575 DEVMETHOD(pci_read_config, vga_pci_read_config),
576 DEVMETHOD(pci_write_config, vga_pci_write_config),
577 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
578 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
579 DEVMETHOD(pci_enable_io, vga_pci_enable_io),
580 DEVMETHOD(pci_disable_io, vga_pci_disable_io),
581 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident),
582 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly),
583 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate),
584 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate),
585 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
586 DEVMETHOD(pci_find_cap, vga_pci_find_cap),
587 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap),
588 DEVMETHOD(pci_find_htcap, vga_pci_find_htcap),
589 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi),
590 DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix),
591 DEVMETHOD(pci_remap_msix, vga_pci_remap_msix),
592 DEVMETHOD(pci_release_msi, vga_pci_release_msi),
593 DEVMETHOD(pci_msi_count, vga_pci_msi_count),
594 DEVMETHOD(pci_msix_count, vga_pci_msix_count),
599 static driver_t vga_pci_driver = {
602 sizeof(struct vga_pci_softc),
605 static devclass_t vga_devclass;
607 DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0);