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, 247 insertions, 0 deletions

diff --git a/sys/dev/pci/agp_ali.c b/sys/dev/pci/agp_ali.c
new file mode 100644
index 00000000000..58cec9ee1c3
--- /dev/null
+++ b/sys/dev/pci/agp_ali.c
@@ -0,0 +1,247 @@
+/*	$OpenBSD: agp_ali.c,v 1.1 2002/07/12 20:17:03 mickey Exp $	*/
+/*	$NetBSD: agp_ali.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_ali.c,v 1.3 2001/07/05 21:28:46 jhb Exp $
+ */
+
+
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/conf.h>
+#include <sys/device.h>
+#include <sys/lock.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>
+
+struct agp_ali_softc {
+	u_int32_t	initial_aperture; /* aperture size at startup */
+	struct agp_gatt *gatt;
+};
+
+u_int32_t agp_ali_get_aperture(struct vga_pci_softc *);
+int agp_ali_set_aperture(struct vga_pci_softc *sc, u_int32_t);
+int agp_ali_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
+int agp_ali_unbind_page(struct vga_pci_softc *, off_t);
+void agp_ali_flush_tlb(struct vga_pci_softc *);
+
+struct agp_methods agp_ali_methods = {
+	agp_ali_get_aperture,
+	agp_ali_set_aperture,
+	agp_ali_bind_page,
+	agp_ali_unbind_page,
+	agp_ali_flush_tlb,
+	agp_generic_enable,
+	agp_generic_alloc_memory,
+	agp_generic_free_memory,
+	agp_generic_bind_memory,
+	agp_generic_unbind_memory,
+};
+
+int 
+agp_ali_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, struct pci_attach_args *pchb_pa)
+{
+	struct agp_ali_softc *asc;
+	struct agp_gatt *gatt;
+	pcireg_t reg;
+
+	asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT);
+	if (asc == NULL) {
+		printf(": failed to allocate softc\n");
+		return ENOMEM;
+	}
+	sc->sc_chipc = asc;
+	sc->sc_methods = &agp_ali_methods;
+
+	if (agp_map_aperture(sc) != 0) {
+		printf(": failed to map aperture\n");
+		free(asc, M_DEVBUF);
+		return ENXIO;
+	}
+
+	asc->initial_aperture = agp_ali_get_aperture(sc);
+
+	for (;;) {
+		gatt = agp_alloc_gatt(sc);
+		if (gatt != NULL)
+			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(": failed to set aperture\n");
+			return ENOMEM;
+		}
+	}
+	asc->gatt = gatt;
+
+	/* Install the gatt. */
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
+	reg = (reg & 0xff) | gatt->ag_physical;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
+	
+	/* Enable the TLB. */
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
+	reg = (reg & ~0xff) | 0x10;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
+
+	return 0;
+}
+
+#if 0
+int
+agp_ali_detach(struct vga_pci_softc *sc)
+{
+	int error;
+	pcireg_t reg;
+	struct agp_ali_softc *asc = sc->sc_chipc;
+
+	error = agp_generic_detach(sc);
+	if (error)
+		return error;
+
+	/* Disable the TLB.. */
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
+	reg &= ~0xff;
+	reg |= 0x90;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
+
+	/* Put the aperture back the way it started. */
+	AGP_SET_APERTURE(sc, asc->initial_aperture);
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
+	reg &= 0xff;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
+
+	agp_free_gatt(sc, asc->gatt);
+	return 0;
+}
+#endif
+
+#define M 1024*1024
+
+static const u_int32_t agp_ali_table[] = {
+	0,			/* 0 - invalid */
+	1,			/* 1 - invalid */
+	2,			/* 2 - invalid */
+	4*M,			/* 3 - invalid */
+	8*M,			/* 4 - invalid */
+	0,			/* 5 - invalid */
+	16*M,			/* 6 - invalid */
+	32*M,			/* 7 - invalid */
+	64*M,			/* 8 - invalid */
+	128*M,			/* 9 - invalid */
+	256*M,			/* 10 - invalid */
+};
+#define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
+
+u_int32_t
+agp_ali_get_aperture(struct vga_pci_softc *sc)
+{
+	int i;
+
+	/*
+	 * The aperture size is derived from the low bits of attbase.
+	 * I'm not sure this is correct..
+	 */
+	i = (int)pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE) & 0xff;
+	if (i >= agp_ali_table_size)
+		return 0;
+	return agp_ali_table[i];
+}
+
+int
+agp_ali_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
+{
+	int i;
+	pcireg_t reg;
+
+	for (i = 0; i < agp_ali_table_size; i++)
+		if (agp_ali_table[i] == aperture)
+			break;
+	if (i == agp_ali_table_size)
+		return EINVAL;
+
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
+	reg &= ~0xff;
+	reg |= i;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
+	return 0;
+}
+
+int
+agp_ali_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
+{
+	struct agp_ali_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;
+}
+
+int
+agp_ali_unbind_page(struct vga_pci_softc *sc, off_t offset)
+{
+	struct agp_ali_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;
+}
+
+void
+agp_ali_flush_tlb(struct vga_pci_softc *sc)
+{
+	pcireg_t reg;
+
+	reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
+	reg &= ~0xff;
+	reg |= 0x90;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
+	reg &= ~0xff;
+	reg |= 0x10;
+	pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
+}
+