i386/75251: Beginnings of an ATI AGP driver.
Eric Anholt
anholt at FreeBSD.org
Sat Dec 18 22:40:24 PST 2004
>Number: 75251
>Category: i386
>Synopsis: Beginnings of an ATI AGP driver.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-i386
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun Dec 19 06:40:23 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Eric Anholt
>Release: FreeBSD 5.3-STABLE amd64
>Organization:
>Environment:
System: FreeBSD leguin.anholt.net 5.3-STABLE FreeBSD 5.3-STABLE #0: Tue Nov 2 18:17:11 PST 2004 anholt at leguin.anholt.net:/usr/obj/usr/src/current/sys/MYKERNEL amd64
>Description:
An AGP driver is required to use the 3d features of ATI's IGP graphics
chipsets. Attached is a first attempt at one, written by reading the
linux driver and reimplementing. I'm sending a PR so that this code
doesn't get lost, and someone interested in the issue could pick it up.
(I don't have the hardware, myself)
>How-To-Repeat:
cd /usr/src/sys/pci && patch -p0 < agp_ati.diff
>Fix:
--- ati-agp.diff begins here ---
Index: agp_ati.c
===================================================================
RCS file: agp_ati.c
diff -N agp_ati.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ agp_ati.c 19 Dec 2004 06:24:51 -0000
@@ -0,0 +1,365 @@
+/*-
+ * Copyright (c) 2004 Eric Anholt
+ * 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.
+ *
+ * Based on reading the Linux 2.6.8.1 driver by Dave Jones.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_bus.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+
+#include <dev/pci/pcivar.h>
+#include <dev/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/bus.h>
+#include <machine/resource.h>
+#include <sys/rman.h>
+
+MALLOC_DECLARE(M_AGP);
+
+#define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off)
+#define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v)
+
+struct agp_ati_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 */
+ char is_rs300;
+
+ /* The GATT */
+ u_int32_t ag_entries;
+ u_int32_t *ag_virtual; /* virtual address of gatt */
+ u_int32_t *ag_vdir; /* virtual address of page dir */
+ vm_offset_t ag_pdir; /* physical address of page dir */
+};
+
+
+static const char*
+agp_ati_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 0xcab01002:
+ return ("ATI RS100 AGP bridge");
+ case 0xcab21002:
+ return ("ATI RS200 AGP bridge");
+ case 0xcab31002:
+ return ("ATI RS250 AGP bridge");
+ case 0x58301002:
+ return ("ATI RS300_100 AGP bridge");
+ case 0x58311002:
+ return ("ATI RS300_133 AGP bridge");
+ case 0x58321002:
+ return ("ATI RS300_166 AGP bridge");
+ case 0x58331002:
+ return ("ATI RS300_200 AGP bridge");
+ };
+
+ return NULL;
+}
+
+static int
+agp_ati_probe(device_t dev)
+{
+ const char *desc;
+
+ desc = agp_ati_match(dev);
+ if (desc) {
+ device_verbose(dev);
+ device_set_desc(dev, desc);
+ return 0;
+ }
+
+ return ENXIO;
+}
+
+static int
+agp_ati_alloc_gatt(device_t dev)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+ u_int32_t apsize = AGP_GET_APERTURE(dev);
+ u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
+ int i;
+
+ /* Alloc the GATT -- pointers to pages of AGP memory */
+ sc->ag_entries = entries;
+ sc->ag_virtual = malloc(entries * sizeof(u_int32_t), M_AGP,
+ M_NOWAIT | M_ZERO);
+ if (sc->ag_virtual == NULL) {
+ if (bootverbose)
+ device_printf(dev, "aperture allocation failed\n");
+ return ENOMEM;
+ }
+
+ /* Alloc the page directory -- pointers to each page of the GATT */
+ sc->ag_vdir = malloc(AGP_PAGE_SIZE, M_AGP, M_NOWAIT | M_ZERO);
+ if (sc->ag_vdir == NULL) {
+ if (bootverbose)
+ device_printf(dev, "pagedir allocation failed\n");
+ free(sc->ag_virtual, M_AGP);
+ return ENOMEM;
+ }
+ sc->ag_pdir = vtophys((vm_offset_t)sc->ag_vdir);
+
+ /* Fill in the pagedir's pointers to GATT pages */
+ for (i = 0; i < sc->ag_entries / 1024; i++) {
+ vm_offset_t va;
+ vm_offset_t pa;
+
+ va = ((vm_offset_t)sc->ag_virtual) + i * AGP_PAGE_SIZE;
+ pa = vtophys(va);
+ sc->ag_vdir[i] = pa | 1;
+ }
+
+ /*
+ * Make sure the chipset can see everything.
+ */
+ agp_flush_cache();
+
+ return 0;
+}
+
+
+static int
+agp_ati_attach(device_t dev)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+ int error, rid;
+ u_int32_t temp;
+
+ error = agp_generic_attach(dev);
+ if (error)
+ return error;
+
+ switch (pci_get_devid(dev)) {
+ case 0xcab01002: /* ATI RS100 AGP bridge */
+ case 0xcab21002: /*ATI RS200 AGP bridge */
+ case 0xcab31002: /* ATI RS250 AGP bridge */
+ sc->is_rs300 = 0;
+ case 0x58301002: /* ATI RS300_100 AGP bridge */
+ case 0x58311002: /* ATI RS300_133 AGP bridge */
+ case 0x58321002: /* ATI RS300_166 AGP bridge */
+ case 0x58331002: /* ATI RS300_200 AGP bridge */
+ sc->is_rs300 = 1;
+ default:
+ /* Unknown chipset */
+ return EINVAL;
+ };
+
+ rid = ATI_GART_MMADDR;
+ sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 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 (;;) {
+ if (agp_ati_alloc_gatt(dev) == 0)
+ 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;
+ }
+
+ if (sc->is_rs300)
+ pci_write_config(dev, ATI_RS300_IG_AGPMODE, 0x20000, 4);
+ else
+ pci_write_config(dev, ATI_RS100_IG_AGPMODE, 0x20000, 4);
+
+ WRITE4(ATI_GART_FEATURE_ID, 0x00060000);
+
+ temp = pci_read_config(dev, 4, 4); /* XXX: Magic reg# */
+ pci_write_config(dev, 4, temp | (1 << 14), 4);
+
+ WRITE4(ATI_GART_BASE, sc->ag_pdir);
+
+ AGP_FLUSH_TLB(dev);
+
+ return 0;
+}
+
+static int
+agp_ati_detach(device_t dev)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+ int error;
+
+ error = agp_generic_detach(dev);
+ if (error)
+ return error;
+
+ /* Clear the GATT base */
+ WRITE4(ATI_GART_BASE, 0);
+
+ /* Put the aperture back the way it started. */
+ AGP_SET_APERTURE(dev, sc->initial_aperture);
+
+ free(sc->ag_vdir, M_AGP);
+ free(sc->ag_virtual, M_AGP);
+
+ bus_release_resource(dev, SYS_RES_MEMORY, ATI_GART_MMADDR, sc->regs);
+
+ return 0;
+}
+
+static u_int32_t
+agp_ati_get_aperture(device_t dev)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+ int size_value;
+
+ if (sc->is_rs300)
+ size_value = pci_read_config(dev, ATI_RS300_APSIZE, 4);
+ else
+ size_value = pci_read_config(dev, ATI_RS100_APSIZE, 4);
+
+ size_value = (size_value & 0x0000000e) >> 1;
+ size_value = (32 * 1024 * 1024) << size_value;
+
+ return size_value;
+}
+
+static int
+agp_ati_set_aperture(device_t dev, u_int32_t aperture)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+ int size_value;
+
+ if (sc->is_rs300)
+ size_value = pci_read_config(dev, ATI_RS300_APSIZE, 4);
+ else
+ size_value = pci_read_config(dev, ATI_RS100_APSIZE, 4);
+
+ size_value &= ~0x0000000e;
+ size_value |= (ffs(aperture / (32 * 1024 * 1024)) - 1) << 1;
+
+ return 0;
+}
+
+static int
+agp_ati_bind_page(device_t dev, int offset, vm_offset_t physical)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+
+ if (offset < 0 || offset >= (sc->ag_entries << AGP_PAGE_SHIFT))
+ return EINVAL;
+
+ sc->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
+
+ /* invalidate the cache */
+ AGP_FLUSH_TLB(dev);
+ return 0;
+}
+
+static int
+agp_ati_unbind_page(device_t dev, int offset)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+
+ if (offset < 0 || offset >= (sc->ag_entries << AGP_PAGE_SHIFT))
+ return EINVAL;
+
+ sc->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
+ AGP_FLUSH_TLB(dev); /* XXX: Shouldn't other drivers be doing this? */
+ return 0;
+}
+
+static void
+agp_ati_flush_tlb(device_t dev)
+{
+ struct agp_ati_softc *sc = device_get_softc(dev);
+
+ /* Set the cache invalidate bit and wait for the chipset to clear */
+ WRITE4(ATI_GART_CACHE_CNTRL, 1);
+}
+
+static device_method_t agp_ati_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, agp_ati_probe),
+ DEVMETHOD(device_attach, agp_ati_attach),
+ DEVMETHOD(device_detach, agp_ati_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_ati_get_aperture),
+ DEVMETHOD(agp_set_aperture, agp_ati_set_aperture),
+ DEVMETHOD(agp_bind_page, agp_ati_bind_page),
+ DEVMETHOD(agp_unbind_page, agp_ati_unbind_page),
+ DEVMETHOD(agp_flush_tlb, agp_ati_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_ati_driver = {
+ "agp",
+ agp_ati_methods,
+ sizeof(struct agp_ati_softc),
+};
+
+static devclass_t agp_devclass;
+
+DRIVER_MODULE(agp_ati, pci, agp_ati_driver, agp_devclass, 0, 0);
+MODULE_DEPEND(agp_ati, agp, 1, 1, 1);
+MODULE_DEPEND(agp_ati, pci, 1, 1, 1);
Index: agpreg.h
===================================================================
RCS file: /home/ncvs/src/sys/pci/agpreg.h,v
retrieving revision 1.13
diff -u -r1.13 agpreg.h
--- agpreg.h 16 Aug 2004 12:25:48 -0000 1.13
+++ agpreg.h 19 Dec 2004 06:22:26 -0000
@@ -262,4 +262,16 @@
#define AGP_AMD64_CACHECTRL_INVGART 0x00000001
#define AGP_AMD64_CACHECTRL_PTEERR 0x00000002
+/*
+ * ATI IGP registers
+ */
+#define ATI_GART_MMADDR 0x14
+#define ATI_RS100_APSIZE 0xac
+#define ATI_RS100_IG_AGPMODE 0xb0
+#define ATI_RS300_APSIZE 0xf8
+#define ATI_RS300_IG_AGPMODE 0xfc
+#define ATI_GART_FEATURE_ID 0x00
+#define ATI_GART_BASE 0x04
+#define ATI_GART_CACHE_CNTRL 0x0c
+
#endif /* !_PCI_AGPREG_H_ */
--- ati-agp.diff ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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