Add a vgapci(4) stub device driver for VGA PCI devices. This device serves
as a bus so that other drivers such as drm(4), acpi_video(4), and agp(4) can attach to it thus allowing multiple drivers for the same device. It also removes the need for the drmsub hack for the i8[13]0/i915 drm and agp drivers.
This commit is contained in:
John Baldwin
parent
2aacedb237
commit
8e8e46ccfc
262
sys/dev/pci/vga_pci.c
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262
sys/dev/pci/vga_pci.c
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/*-
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* Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Simple driver for PCI VGA display devices. Drivers such as agp(4) and
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* drm(4) should attach as children of this device.
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*
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* XXX: The vgapci name is a hack until we somehow merge the isa vga driver
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* in or rename it.
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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static int
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vga_pci_probe(device_t dev)
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{
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switch (pci_get_class(dev)) {
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case PCIC_DISPLAY:
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break;
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case PCIC_OLD:
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if (pci_get_subclass(dev) != PCIS_OLD_VGA)
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return (ENXIO);
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break;
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default:
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return (ENXIO);
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}
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device_set_desc(dev, "VGA-compatible display");
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return (0);
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}
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static int
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vga_pci_attach(device_t dev)
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{
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bus_generic_probe(dev);
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/*
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* If AGP capabilities are present on this device, then create
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* an AGP child.
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*/
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if (pci_find_extcap(dev, PCIY_AGP, NULL) == 0)
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device_add_child(dev, "agp", -1);
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/* Always create a drm child for now to make it easier on drm. */
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device_add_child(dev, "drm", -1);
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bus_generic_attach(dev);
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return (0);
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}
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static int
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vga_pci_suspend(device_t dev)
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{
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return (bus_generic_suspend(dev));
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}
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static int
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vga_pci_resume(device_t dev)
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{
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return (bus_generic_resume(dev));
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}
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/* Bus interface. */
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static int
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vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
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}
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static int
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vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
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{
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return (EINVAL);
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}
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static struct resource *
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vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
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}
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static int
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vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
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struct resource *r)
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{
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return (bus_release_resource(dev, type, rid, r));
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}
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/* PCI interface. */
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static uint32_t
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vga_pci_read_config(device_t dev, device_t child, int reg, int width)
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{
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return (pci_read_config(dev, reg, width));
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}
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static void
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vga_pci_write_config(device_t dev, device_t child, int reg,
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uint32_t val, int width)
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{
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pci_write_config(dev, reg, val, width);
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}
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static int
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vga_pci_enable_busmaster(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_enable_busmaster\n",
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device_get_nameunit(child));
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return (pci_enable_busmaster(dev));
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}
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static int
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vga_pci_disable_busmaster(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_disable_busmaster\n",
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device_get_nameunit(child));
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return (pci_disable_busmaster(dev));
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}
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static int
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vga_pci_enable_io(device_t dev, device_t child, int space)
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{
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device_printf(dev, "child %s requested pci_enable_io\n",
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device_get_nameunit(child));
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return (pci_enable_io(dev, space));
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}
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static int
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vga_pci_disable_io(device_t dev, device_t child, int space)
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{
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device_printf(dev, "child %s requested pci_disable_io\n",
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device_get_nameunit(child));
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return (pci_disable_io(dev, space));
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}
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static int
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vga_pci_set_powerstate(device_t dev, device_t child, int state)
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{
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device_printf(dev, "child %s requested pci_set_powerstate\n",
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device_get_nameunit(child));
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return (pci_set_powerstate(dev, state));
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}
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static int
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vga_pci_get_powerstate(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_get_powerstate\n",
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device_get_nameunit(child));
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return (pci_get_powerstate(dev));
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}
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static int
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vga_pci_assign_interrupt(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_assign_interrupt\n",
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device_get_nameunit(child));
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return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
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}
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static int
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vga_pci_find_extcap(device_t dev, device_t child, int capability,
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int *capreg)
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{
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return (pci_find_extcap(dev, capability, capreg));
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}
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static device_method_t vga_pci_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, vga_pci_probe),
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DEVMETHOD(device_attach, vga_pci_attach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, vga_pci_suspend),
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DEVMETHOD(device_resume, vga_pci_resume),
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/* Bus interface */
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DEVMETHOD(bus_read_ivar, vga_pci_read_ivar),
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DEVMETHOD(bus_write_ivar, vga_pci_write_ivar),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource),
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DEVMETHOD(bus_release_resource, vga_pci_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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/* PCI interface */
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DEVMETHOD(pci_read_config, vga_pci_read_config),
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DEVMETHOD(pci_write_config, vga_pci_write_config),
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DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
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DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
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DEVMETHOD(pci_enable_io, vga_pci_enable_io),
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DEVMETHOD(pci_disable_io, vga_pci_disable_io),
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DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate),
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DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate),
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DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
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DEVMETHOD(pci_find_extcap, vga_pci_find_extcap),
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{ 0, 0 }
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};
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static driver_t vga_pci_driver = {
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"vgapci",
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vga_pci_methods,
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1,
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};
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static devclass_t vga_devclass;
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DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0);
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