support for the agp gart on various agp chipsets.

only i810 driver was tested though.
based on the netbsd's lkm, initially ported
by hunter@dg.net.ua and later made into shape by mickey.
testing by art@ and millert@ .

1 files changed, 219 insertions, 0 deletions

diff --git a/sys/dev/pci/agp_via.c b/sys/dev/pci/agp_via.c
new file mode 100644
index 00000000000..dd5e7dc4cf1
--- /dev/null
+++ b/sys/dev/pci/agp_via.c
@@ -0,0 +1,219 @@
+/*	$OpenBSD: agp_via.c,v 1.1 2002/07/12 20:17:03 mickey Exp $	*/
+/*	$NetBSD: agp_via.c,v 1.2 2001/09/15 00:25:00 thorpej Exp $	*/
+
+/*-
+ * 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: src/sys/pci/agp_via.c,v 1.3 2001/07/05 21:28:47 jhb Exp $
+ */
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/proc.h>
+#include <sys/conf.h>
+#include <sys/device.h>
+#include <sys/agpio.h>
+
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcireg.h>
+#include <dev/pci/vga_pcivar.h>
+#include <dev/pci/agpvar.h>
+#include <dev/pci/agpreg.h>
+
+#include <machine/bus.h>
+
+static u_int32_t agp_via_get_aperture(struct vga_pci_softc *);
+static int agp_via_set_aperture(struct vga_pci_softc *, u_int32_t);
+static int agp_via_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
+static int agp_via_unbind_page(struct vga_pci_softc *, off_t);
+static void agp_via_flush_tlb(struct vga_pci_softc *);
+
+struct agp_methods agp_via_methods = {
+	agp_via_get_aperture,
+	agp_via_set_aperture,
+	agp_via_bind_page,
+	agp_via_unbind_page,
+	agp_via_flush_tlb,
+	agp_generic_enable,
+	agp_generic_alloc_memory,
+	agp_generic_free_memory,
+	agp_generic_bind_memory,
+	agp_generic_unbind_memory,
+};
+
+struct agp_via_softc {
+	u_int32_t	initial_aperture; /* aperture size at startup */
+	struct agp_gatt *gatt;
+};
+
+
+int
+agp_via_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, struct pci_attach_args *pchb_pa)
+{
+	struct agp_via_softc *asc;
+	struct agp_gatt *gatt;
+
+	asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT);
+	if (asc == NULL) {
+		printf(": can't allocate chipset-specific softc\n");
+		return ENOMEM;
+	}
+	memset(asc, 0, sizeof *asc);
+	sc->sc_chipc = asc;
+	sc->sc_methods = &agp_via_methods;
+
+	if (agp_map_aperture(sc) != 0) {
+		printf(": can't map aperture\n");
+		free(asc, M_DEVBUF);
+		return ENXIO;
+	}
+
+	asc->initial_aperture = AGP_GET_APERTURE(sc);
+
+	for (;;) {
+		gatt = agp_alloc_gatt(sc);
+		if (gatt)
+			break;
+
+		/*
+		 * Probably contigmalloc failure. Try reducing the
+		 * aperture so that the gatt size reduces.
+		 */
+		if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
+			agp_generic_detach(sc);
+			printf(": can't set aperture size\n");
+			return ENOMEM;
+		}
+	}
+	asc->gatt = gatt;
+
+	/* Install the gatt. */
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE,
+			 gatt->ag_physical | 3);
+	
+	/* Enable the aperture. */
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0000000f);
+
+	return 0;
+}
+
+#if 0
+static int
+agp_via_detach(struct vga_pci_softc *sc)
+{
+	struct agp_via_softc *asc = sc->sc_chipc;
+	int error;
+
+	error = agp_generic_detach(sc);
+	if (error)
+		return error;
+
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0);
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE, 0);
+	AGP_SET_APERTURE(sc, asc->initial_aperture);
+	agp_free_gatt(sc, asc->gatt);
+
+	return 0;
+}
+#endif
+
+static u_int32_t
+agp_via_get_aperture(struct vga_pci_softc *sc)
+{
+	u_int32_t apsize;
+
+	apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE) & 0x1f;
+
+	/*
+	 * The size is determined by the number of low bits of
+	 * register APBASE which are forced to zero. The low 20 bits
+	 * are always forced to zero and each zero bit in the apsize
+	 * field just read forces the corresponding bit in the 27:20
+	 * to be zero. We calculate the aperture size accordingly.
+	 */
+	return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
+}
+
+static int
+agp_via_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
+{
+	u_int32_t apsize;
+	pcireg_t reg;
+
+	/*
+	 * Reverse the magic from get_aperture.
+	 */
+	apsize = ((aperture - 1) >> 20) ^ 0xff;
+
+	/*
+	 * Double check for sanity.
+	 */
+	if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
+		return EINVAL;
+
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE);
+	reg &= ~0xff;
+	reg |= apsize;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE, reg);
+
+	return 0;
+}
+
+static int
+agp_via_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
+{
+	struct agp_via_softc *asc = sc->sc_chipc;
+
+	if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
+		return EINVAL;
+
+	asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
+	return 0;
+}
+
+static int
+agp_via_unbind_page(struct vga_pci_softc *sc, off_t offset)
+{
+	struct agp_via_softc *asc = sc->sc_chipc;
+
+	if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
+		return EINVAL;
+
+	asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
+	return 0;
+}
+
+static void
+agp_via_flush_tlb(struct vga_pci_softc *sc)
+{
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x8f);
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0f);
+}
+
+