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.

1 files changed, 262 insertions, 0 deletions

diff --git a/sys/dev/pci/vga_pci.c b/sys/dev/pci/vga_pci.c
new file mode 100644
index 0000000..43eb876
--- /dev/null
+++ b/sys/dev/pci/vga_pci.c
@@ -0,0 +1,262 @@
+/*-
+ * Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Simple driver for PCI VGA display devices.  Drivers such as agp(4) and
+ * drm(4) should attach as children of this device.
+ *
+ * XXX: The vgapci name is a hack until we somehow merge the isa vga driver
+ * in or rename it.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+
+static int
+vga_pci_probe(device_t dev)
+{
+
+	switch (pci_get_class(dev)) {
+	case PCIC_DISPLAY:
+		break;
+	case PCIC_OLD:
+		if (pci_get_subclass(dev) != PCIS_OLD_VGA)
+			return (ENXIO);
+		break;
+	default:
+		return (ENXIO);
+	}
+	device_set_desc(dev, "VGA-compatible display");
+	return (0);
+}
+
+static int
+vga_pci_attach(device_t dev)
+{
+
+	bus_generic_probe(dev);
+
+	/*
+	 * If AGP capabilities are present on this device, then create
+	 * an AGP child.
+	 */
+	if (pci_find_extcap(dev, PCIY_AGP, NULL) == 0)
+		device_add_child(dev, "agp", -1);
+
+	/* Always create a drm child for now to make it easier on drm. */
+	device_add_child(dev, "drm", -1);
+	bus_generic_attach(dev);
+	return (0);
+}
+
+static int
+vga_pci_suspend(device_t dev)
+{
+
+	return (bus_generic_suspend(dev));
+}
+
+static int
+vga_pci_resume(device_t dev)
+{
+
+	return (bus_generic_resume(dev));
+}
+
+/* Bus interface. */
+
+static int
+vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
+{
+
+	return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
+}
+
+static int
+vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
+{
+
+	return (EINVAL);
+}
+
+static struct resource *
+vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
+    u_long start, u_long end, u_long count, u_int flags)
+{
+
+	return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
+}
+
+static int
+vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
+    struct resource *r)
+{
+
+	return (bus_release_resource(dev, type, rid, r));
+}
+
+/* PCI interface. */
+
+static uint32_t
+vga_pci_read_config(device_t dev, device_t child, int reg, int width)
+{
+
+	return (pci_read_config(dev, reg, width));
+}
+
+static void
+vga_pci_write_config(device_t dev, device_t child, int reg, 
+    uint32_t val, int width)
+{
+
+	pci_write_config(dev, reg, val, width);
+}
+
+static int
+vga_pci_enable_busmaster(device_t dev, device_t child)
+{
+
+	device_printf(dev, "child %s requested pci_enable_busmaster\n",
+	    device_get_nameunit(child));
+	return (pci_enable_busmaster(dev));
+}
+
+static int
+vga_pci_disable_busmaster(device_t dev, device_t child)
+{
+
+	device_printf(dev, "child %s requested pci_disable_busmaster\n",
+	    device_get_nameunit(child));
+	return (pci_disable_busmaster(dev));
+}
+
+static int
+vga_pci_enable_io(device_t dev, device_t child, int space)
+{
+
+	device_printf(dev, "child %s requested pci_enable_io\n",
+	    device_get_nameunit(child));
+	return (pci_enable_io(dev, space));
+}
+
+static int
+vga_pci_disable_io(device_t dev, device_t child, int space)
+{
+
+	device_printf(dev, "child %s requested pci_disable_io\n",
+	    device_get_nameunit(child));
+	return (pci_disable_io(dev, space));
+}
+
+static int
+vga_pci_set_powerstate(device_t dev, device_t child, int state)
+{
+
+	device_printf(dev, "child %s requested pci_set_powerstate\n",
+	    device_get_nameunit(child));
+	return (pci_set_powerstate(dev, state));
+}
+
+static int
+vga_pci_get_powerstate(device_t dev, device_t child)
+{
+
+	device_printf(dev, "child %s requested pci_get_powerstate\n",
+	    device_get_nameunit(child));
+	return (pci_get_powerstate(dev));
+}
+
+static int
+vga_pci_assign_interrupt(device_t dev, device_t child)
+{
+
+	device_printf(dev, "child %s requested pci_assign_interrupt\n",
+	    device_get_nameunit(child));
+	return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
+}
+
+static int
+vga_pci_find_extcap(device_t dev, device_t child, int capability,
+    int *capreg)
+{
+
+	return (pci_find_extcap(dev, capability, capreg));
+}
+
+static device_method_t vga_pci_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		vga_pci_probe),
+	DEVMETHOD(device_attach,	vga_pci_attach),
+	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
+	DEVMETHOD(device_suspend,	vga_pci_suspend),
+	DEVMETHOD(device_resume,	vga_pci_resume),
+
+	/* Bus interface */
+	DEVMETHOD(bus_read_ivar,	vga_pci_read_ivar),
+	DEVMETHOD(bus_write_ivar,	vga_pci_write_ivar),
+	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
+	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
+
+	DEVMETHOD(bus_alloc_resource,	vga_pci_alloc_resource),
+	DEVMETHOD(bus_release_resource,	vga_pci_release_resource),
+	DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
+	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
+
+	/* PCI interface */
+	DEVMETHOD(pci_read_config,	vga_pci_read_config),
+	DEVMETHOD(pci_write_config,	vga_pci_write_config),
+	DEVMETHOD(pci_enable_busmaster,	vga_pci_enable_busmaster),
+	DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
+	DEVMETHOD(pci_enable_io,	vga_pci_enable_io),
+	DEVMETHOD(pci_disable_io,	vga_pci_disable_io),
+	DEVMETHOD(pci_get_powerstate,	vga_pci_get_powerstate),
+	DEVMETHOD(pci_set_powerstate,	vga_pci_set_powerstate),
+	DEVMETHOD(pci_assign_interrupt,	vga_pci_assign_interrupt),
+	DEVMETHOD(pci_find_extcap,	vga_pci_find_extcap),
+
+	{ 0, 0 }
+};
+
+static driver_t vga_pci_driver = {
+	"vgapci",
+	vga_pci_methods,
+	1,
+};
+
+static devclass_t vga_devclass;
+
+DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0);