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[src/trunk]: src/sys/arch/dreamcast/dev/g2 GAPS PCI bridge support. Low-leve...
details: https://anonhg.NetBSD.org/src/rev/2d1bc49f97a9
branches: trunk
changeset: 503125:2d1bc49f97a9
user: thorpej <thorpej%NetBSD.org@localhost>
date: Thu Feb 01 01:04:55 2001 +0000
description:
GAPS PCI bridge support. Low-level stuff from Marcus, bus_dma
implementation from me.
diffstat:
sys/arch/dreamcast/dev/g2/gapspci.c | 138 +++++++
sys/arch/dreamcast/dev/g2/gapspci_dma.c | 627 ++++++++++++++++++++++++++++++++
sys/arch/dreamcast/dev/g2/gapspci_pci.c | 199 ++++++++++
sys/arch/dreamcast/dev/g2/gapspcivar.h | 52 ++
4 files changed, 1016 insertions(+), 0 deletions(-)
diffs (truncated from 1032 to 300 lines):
diff -r b624dbe2634b -r 2d1bc49f97a9 sys/arch/dreamcast/dev/g2/gapspci.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/dreamcast/dev/g2/gapspci.c Thu Feb 01 01:04:55 2001 +0000
@@ -0,0 +1,138 @@
+/* $NetBSD: gapspci.c,v 1.1 2001/02/01 01:04:55 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 2001 Marcus Comstedt
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Marcus Comstedt.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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> /* RCS ID & Copyright macro defns */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+#include <sys/conf.h>
+#include <sys/mbuf.h>
+
+#include <machine/cpu.h>
+#include <machine/bus.h>
+
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcireg.h>
+
+#include <dev/pci/pcidevs.h>
+
+#include <dreamcast/dev/g2/g2busvar.h>
+#include <dreamcast/dev/g2/gapspcivar.h>
+
+int gaps_match(struct device *, struct cfdata *, void *);
+void gaps_attach(struct device *, struct device *, void *);
+
+int gaps_print(void *, const char *);
+
+struct cfattach gapspci_ca = {
+ sizeof(struct gaps_softc),
+ gaps_match,
+ gaps_attach,
+};
+
+int
+gaps_match(struct device *parent, struct cfdata *match, void *aux)
+{
+ /* struct g2bus_attach_args *ga = aux; */
+ char idbuf[16];
+
+ if(strcmp("gapspci", match->cf_driver->cd_name))
+ return 0;
+
+ /* FIXME */
+ memcpy(idbuf, (void *)0xa1001400, sizeof(idbuf));
+
+ if(strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
+ return 0;
+
+ return (1);
+}
+
+void
+gaps_attach(struct device *parent, struct device *self, void *aux)
+{
+ struct g2bus_attach_args *ga = aux;
+ struct gaps_softc *sc = (void *) self;
+ struct pcibus_attach_args pba;
+ int i;
+
+ printf(": SEGA GAPS PCI Bridge\n");
+
+ sc->sc_dmabase = 0x1840000;
+ sc->sc_memt = ga->ga_memt;
+
+ /* FIXME */
+ *(volatile unsigned int *)(void *)(0xa1001418) = 0x5a14a501;
+
+ for(i=0; i<1000000; i++)
+ ;
+
+ if(*(volatile unsigned int *)(void *)(0xa1001418) != 1)
+ return;
+
+ *(volatile unsigned int *)(void *)(0xa1001420) = 0x1000000;
+ *(volatile unsigned int *)(void *)(0xa1001424) = 0x1000000;
+ *(volatile unsigned int *)(void *)(0xa1001428) = sc->sc_dmabase;
+ *(volatile unsigned int *)(void *)(0xa1001414) = 1;
+ *(volatile unsigned int *)(void *)(0xa1001434) = 1;
+
+ gaps_pci_init(sc);
+ gaps_dma_init(sc);
+
+ memset(&pba, 0, sizeof(pba));
+
+ pba.pba_busname = "pci";
+ pba.pba_memt = sc->sc_memt;
+ pba.pba_dmat = &sc->sc_dmat;
+ pba.pba_bus = 0;
+ pba.pba_flags = PCI_FLAGS_MEM_ENABLED;
+ pba.pba_pc = &sc->sc_pc;
+
+ (void) config_found(self, &pba, gaps_print);
+}
+
+int
+gaps_print(void *aux, const char *pnp)
+{
+ struct pcibus_attach_args *pba = aux;
+
+ if (pnp)
+ printf("%s at %s", pba->pba_busname, pnp);
+ printf(" bus %d", pba->pba_bus);
+
+ return (UNCONF);
+}
diff -r b624dbe2634b -r 2d1bc49f97a9 sys/arch/dreamcast/dev/g2/gapspci_dma.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/dreamcast/dev/g2/gapspci_dma.c Thu Feb 01 01:04:55 2001 +0000
@@ -0,0 +1,627 @@
+/* $NetBSD: gapspci_dma.c,v 1.1 2001/02/01 01:04:55 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 2001 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the NetBSD
+ * Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * Bus DMA implementation for the SEGA GAPS PCI bridge.
+ *
+ * NOTE: We only implement a small subset of what the bus_space(9)
+ * API specifies. Right now, the GAPS PCI bridge is only used for
+ * the Dreamcast Broadband Adatper, so we only provide what the
+ * pci(4) and rtk(4) drivers need.
+ */
+
+#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/mbuf.h>
+#include <sys/extent.h>
+#include <sys/malloc.h>
+
+#include <machine/cpu.h>
+#include <machine/bus.h>
+
+#include <dev/pci/pcivar.h>
+
+#include <dreamcast/dev/g2/gapspcivar.h>
+
+#include <uvm/uvm_extern.h>
+
+int gaps_dmamap_create(bus_dma_tag_t, bus_size_t, int, bus_size_t,
+ bus_size_t, int, bus_dmamap_t *);
+void gaps_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
+int gaps_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
+ struct proc *, int);
+int gaps_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int);
+int gaps_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, struct uio *, int);
+int gaps_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *,
+ int, bus_size_t, int);
+void gaps_dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
+void gaps_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
+ bus_size_t, int);
+
+int gaps_dmamem_alloc(bus_dma_tag_t tag, bus_size_t size,
+ bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs,
+ int nsegs, int *rsegs, int flags);
+void gaps_dmamem_free(bus_dma_tag_t tag, bus_dma_segment_t *segs, int nsegs);
+int gaps_dmamem_map(bus_dma_tag_t tag, bus_dma_segment_t *segs, int nsegs,
+ size_t size, caddr_t *kvap, int flags);
+void gaps_dmamem_unmap(bus_dma_tag_t tag, caddr_t kva, size_t size);
+paddr_t gaps_dmamem_mmap(bus_dma_tag_t tag, bus_dma_segment_t *segs, int nsegs,
+ off_t off, int prot, int flags);
+
+void
+gaps_dma_init(struct gaps_softc *sc)
+{
+ bus_dma_tag_t t = &sc->sc_dmat;
+
+ memset(t, 0, sizeof(*t));
+
+ t->_cookie = sc;
+ t->_dmamap_create = gaps_dmamap_create;
+ t->_dmamap_destroy = gaps_dmamap_destroy;
+ t->_dmamap_load = gaps_dmamap_load;
+ t->_dmamap_load_mbuf = gaps_dmamap_load_mbuf;
+ t->_dmamap_load_uio = gaps_dmamap_load_uio;
+ t->_dmamap_load_raw = gaps_dmamap_load_raw;
+ t->_dmamap_unload = gaps_dmamap_unload;
+ t->_dmamap_sync = gaps_dmamap_sync;
+
+ t->_dmamem_alloc = gaps_dmamem_alloc;
+ t->_dmamem_free = gaps_dmamem_free;
+ t->_dmamem_map = gaps_dmamem_map;
+ t->_dmamem_unmap = gaps_dmamem_unmap;
+ t->_dmamem_mmap = gaps_dmamem_mmap;
+
+ /*
+ * The GAPS PCI bridge has 32k of DMA memory. We manage it
+ * with an extent map.
+ */
+ sc->sc_dma_ex = extent_create("gaps dma",
+ sc->sc_dmabase, sc->sc_dmabase + (32768 - 1),
+ M_DEVBUF, NULL, 0, EX_WAITOK | EXF_NOCOALESCE);
+
+ if (bus_space_map(sc->sc_memt, sc->sc_dmabase, 32768,
+ 0, &sc->sc_dma_memh) != 0)
+ panic("gaps_dma_init: can't map SRAM buffer");
+}
+
+/*
+ * A GAPS DMA map -- has the standard DMA map, plus some extra
+ * housekeeping data.
+ */
+struct gaps_dmamap {
+ struct dreamcast_bus_dmamap gd_dmamap;
+ void *gd_origbuf;
+ int gd_buftype;
+};
+
+#define GAPS_DMA_BUFTYPE_INVALID 0
+#define GAPS_DMA_BUFTYPE_LINEAR 1
+#define GAPS_DMA_BUFTYPE_MBUF 2
+
+int
+gaps_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments,
+ bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamap)
+{
+ struct gaps_softc *sc = t->_cookie;
+ struct gaps_dmamap *gmap;
+ bus_dmamap_t map;
+
+ /*
+ * Allocate an initialize the DMA map. The end of the map is
+ * a variable-sized array of segments, so we allocate enough
+ * room for them in one shot. Since the DMA map always includes
+ * one segment, and we only support one segment, this is really
+ * easy.
+ *
+ * Note we don't preserve the WAITOK or NOWAIT flags. Preservation
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