A driver for programming the AGP hardware. This is only very lightly

tested on Intel BX chipsets only. The other agp minidrivers are totally
untested.

The programming api is a subset of the Linux api and is only intended to
be enough for the X server to use. There is also an in-kernel api for the
use of other kernel modules such as the 3D DRI.

1 files changed, 276 insertions, 0 deletions

diff --git a/sys/dev/agp/agp_amd.c b/sys/dev/agp/agp_amd.c
new file mode 100644
index 0000000..112918a
--- /dev/null
+++ b/sys/dev/agp/agp_amd.c
@@ -0,0 +1,276 @@
+/*-
+ * Copyright (c) 2000 Doug Rabson
+ * 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.
+ *
+ * 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.
+ *
+ *	$FreeBSD$
+ */
+
+#include "opt_bus.h"
+#include "opt_pci.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/lock.h>
+
+#include <pci/pcivar.h>
+#include <pci/pcireg.h>
+#include <pci/agppriv.h>
+#include <pci/agpreg.h>
+
+#include <vm/vm.h>
+#include <vm/vm_object.h>
+#include <vm/pmap.h>
+#include <machine/clock.h>
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/rman.h>
+
+#define READ2(off)	bus_space_read_2(sc->bst, sc->bsh, off)
+#define READ4(off)	bus_space_read_4(sc->bst, sc->bsh, off)
+#define WRITE2(off,v)	bus_space_write_2(sc->bst, sc->bsh, off, v)
+#define WRITE4(off,v)	bus_space_write_4(sc->bst, sc->bsh, off, v)
+
+struct agp_amd_softc {
+	struct agp_softc agp;
+	struct resource *regs;	/* memory mapped control registers */
+	bus_space_tag_t bst;	/* bus_space tag */
+	bus_space_handle_t bsh;	/* bus_space handle */
+	u_int32_t	initial_aperture; /* aperture size at startup */
+	struct agp_gatt *gatt;
+};
+
+static const char*
+agp_amd_match(device_t dev)
+{
+	if (pci_get_class(dev) != PCIC_BRIDGE
+	    || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
+		return NULL;
+
+	if (agp_find_caps(dev) == 0)
+		return NULL;
+
+	switch (pci_get_devid(dev)) {
+	case 0x70061022:
+		return ("AMD 751 host to AGP bridge");
+	};
+
+	return NULL;
+}
+
+static int
+agp_amd_probe(device_t dev)
+{
+	const char *desc;
+
+	desc = agp_amd_match(dev);
+	if (desc) {
+		device_verbose(dev);
+		device_set_desc(dev, desc);
+		return 0;
+	}
+
+	return ENXIO;
+}
+
+static int
+agp_amd_attach(device_t dev)
+{
+	struct agp_amd_softc *sc = device_get_softc(dev);
+	struct agp_gatt *gatt;
+	int error, rid;
+
+	error = agp_generic_attach(dev);
+	if (error)
+		return error;
+
+	rid = AGP_AMD751_REGISTERS;
+	sc->regs = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
+				      0, ~0, 1, RF_ACTIVE);
+	if (!sc->regs) {
+		agp_generic_detach(dev);
+		return ENOMEM;
+	}
+
+	sc->bst = rman_get_bustag(sc->regs);
+	sc->bsh = rman_get_bushandle(sc->regs);
+
+	sc->initial_aperture = AGP_GET_APERTURE(dev);
+
+	for (;;) {
+		gatt = agp_alloc_gatt(dev);
+		if (gatt)
+			break;
+
+		/*
+		 * Probably contigmalloc failure. Try reducing the
+		 * aperture so that the gatt size reduces.
+		 */
+		if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
+			return ENOMEM;
+	}
+	sc->gatt = gatt;
+
+	/* Install the gatt. */
+	WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical);
+	
+	/* Enable synchronisation between host and agp. */
+	pci_write_config(dev, AGP_AMD751_MODECTRL, 0x80, 1);
+
+	/* Enable the TLB and flush */
+	WRITE2(AGP_AMD751_STATUS,
+	       READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
+	AGP_FLUSH_TLB(dev);
+
+	return agp_generic_attach(dev);
+}
+
+static int
+agp_amd_detach(device_t dev)
+{
+	struct agp_amd_softc *sc = device_get_softc(dev);
+
+	/* Disable the TLB.. */
+	WRITE2(AGP_AMD751_STATUS,
+	       READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
+	
+	/* Disable host-agp sync */
+	pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
+	
+	/* Clear the GATT base */
+	WRITE4(AGP_AMD751_ATTBASE, 0);
+
+	/* Put the aperture back the way it started. */
+	AGP_SET_APERTURE(dev, sc->initial_aperture);
+
+	agp_free_gatt(sc->gatt);
+	return 0;
+}
+
+static u_int32_t
+agp_amd_get_aperture(device_t dev)
+{
+	int vas;
+
+	/*
+	 * The aperture size is equal to 32M<<vas.
+	 */
+	vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
+	return (32*1024*1024) << vas;
+}
+
+static int
+agp_amd_set_aperture(device_t dev, u_int32_t aperture)
+{
+	int vas;
+
+	/*
+	 * Check for a power of two and make sure its within the
+	 * programmable range.
+	 */
+	if (aperture & (aperture - 1)
+	    || aperture < 32*1024*1024
+	    || aperture > 2U*1024*1024*1024)
+		return EINVAL;
+
+	vas = ffs(aperture / 32*1024*1024) - 1;
+	
+	pci_write_config(dev, AGP_AMD751_APCTRL,
+			 ((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
+			  | vas << 1), 1);
+
+	return 0;
+}
+
+static int
+agp_amd_bind_page(device_t dev, int offset, vm_offset_t physical)
+{
+	struct agp_amd_softc *sc = device_get_softc(dev);
+
+	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
+		return EINVAL;
+
+	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
+	return 0;
+}
+
+static int
+agp_amd_unbind_page(device_t dev, int offset)
+{
+	struct agp_amd_softc *sc = device_get_softc(dev);
+
+	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
+		return EINVAL;
+
+	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
+	return 0;
+}
+
+static void
+agp_amd_flush_tlb(device_t dev)
+{
+	struct agp_amd_softc *sc = device_get_softc(dev);
+
+	/* Set the cache invalidate bit and wait for the chipset to clear */
+	WRITE4(AGP_AMD751_TLBCTRL, 1);
+	do {
+		DELAY(1);
+	} while (READ4(AGP_AMD751_TLBCTRL));
+}
+
+static device_method_t agp_amd_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		agp_amd_probe),
+	DEVMETHOD(device_attach,	agp_amd_attach),
+	DEVMETHOD(device_detach,	agp_amd_detach),
+	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
+	DEVMETHOD(device_suspend,	bus_generic_suspend),
+	DEVMETHOD(device_resume,	bus_generic_resume),
+
+	/* AGP interface */
+	DEVMETHOD(agp_get_aperture,	agp_amd_get_aperture),
+	DEVMETHOD(agp_set_aperture,	agp_amd_set_aperture),
+	DEVMETHOD(agp_bind_page,	agp_amd_bind_page),
+	DEVMETHOD(agp_unbind_page,	agp_amd_unbind_page),
+	DEVMETHOD(agp_flush_tlb,	agp_amd_flush_tlb),
+	DEVMETHOD(agp_enable,		agp_generic_enable),
+	DEVMETHOD(agp_alloc_memory,	agp_generic_alloc_memory),
+	DEVMETHOD(agp_free_memory,	agp_generic_free_memory),
+	DEVMETHOD(agp_bind_memory,	agp_generic_bind_memory),
+	DEVMETHOD(agp_unbind_memory,	agp_generic_unbind_memory),
+
+	{ 0, 0 }
+};
+
+static driver_t agp_amd_driver = {
+	"agp",
+	agp_amd_methods,
+	sizeof(struct agp_amd_softc),
+};
+
+static devclass_t agp_devclass;
+
+DRIVER_MODULE(agp_amd, pci, agp_amd_driver, agp_devclass, 0, 0);