711 lines
17 KiB
C
711 lines
17 KiB
C
/* $NetBSD: bus_dma.c,v 1.19 2001/04/01 01:42:51 dbj Exp $ */
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/*
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* This file was taken from from alpha/common/bus_dma.c
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* should probably be re-synced when needed.
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* Darrin B. Jewell <dbj@netbsd.org> Sat Jul 31 06:11:33 UTC 1999
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* original cvs id: NetBSD: bus_dma.c,v 1.31 1999/07/08 18:05:23 thorpej Exp
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*/
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/*-
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* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.19 2001/04/01 01:42:51 dbj Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#define _NEXT68K_BUS_DMA_PRIVATE
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#include <machine/bus.h>
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#include <m68k/cacheops.h>
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int _bus_dmamap_load_buffer_direct_common __P((bus_dma_tag_t,
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bus_dmamap_t, void *, bus_size_t, struct proc *, int,
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paddr_t *, int *, int));
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/*
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* Common function for DMA map creation. May be called by bus-specific
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* DMA map creation functions.
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*/
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int
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_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
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bus_dma_tag_t t;
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bus_size_t size;
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int nsegments;
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bus_size_t maxsegsz;
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bus_size_t boundary;
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int flags;
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bus_dmamap_t *dmamp;
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{
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struct next68k_bus_dmamap *map;
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void *mapstore;
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size_t mapsize;
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/*
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* Allcoate and initialize the DMA map. The end of the map
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* is a variable-sized array of segments, so we allocate enough
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* room for them in one shot.
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*
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* Note we don't preserve the WAITOK or NOWAIT flags. Preservation
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* of ALLOCNOW notifes others that we've reserved these resources,
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* and they are not to be freed.
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*
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* The bus_dmamap_t includes one bus_dma_segment_t, hence
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* the (nsegments - 1).
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*/
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mapsize = sizeof(struct next68k_bus_dmamap) +
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(sizeof(bus_dma_segment_t) * (nsegments - 1));
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if ((mapstore = malloc(mapsize, M_DMAMAP,
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(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
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return (ENOMEM);
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bzero(mapstore, mapsize);
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map = (struct next68k_bus_dmamap *)mapstore;
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map->_dm_size = size;
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map->_dm_segcnt = nsegments;
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map->_dm_maxsegsz = maxsegsz;
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if (t->_boundary != 0 && t->_boundary < boundary)
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map->_dm_boundary = t->_boundary;
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else
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map->_dm_boundary = boundary;
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map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
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map->dm_mapsize = 0; /* no valid mappings */
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map->dm_nsegs = 0;
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*dmamp = map;
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return (0);
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}
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/*
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* Common function for DMA map destruction. May be called by bus-specific
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* DMA map destruction functions.
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*/
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void
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_bus_dmamap_destroy(t, map)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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{
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free(map, M_DMAMAP);
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}
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/*
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* Utility function to load a linear buffer. lastaddrp holds state
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* between invocations (for multiple-buffer loads). segp contains
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* the starting segment on entrance, and the ending segment on exit.
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* first indicates if this is the first invocation of this function.
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*/
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int
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_bus_dmamap_load_buffer_direct_common(t, map, buf, buflen, p, flags,
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lastaddrp, segp, first)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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void *buf;
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bus_size_t buflen;
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struct proc *p;
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int flags;
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paddr_t *lastaddrp;
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int *segp;
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int first;
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{
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bus_size_t sgsize;
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bus_addr_t curaddr, lastaddr, baddr, bmask;
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vaddr_t vaddr = (vaddr_t)buf;
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int seg;
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lastaddr = *lastaddrp;
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bmask = ~(map->_dm_boundary - 1);
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for (seg = *segp; buflen > 0 ; ) {
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/*
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* Get the physical address for this segment.
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*/
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if (p != NULL)
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(void) pmap_extract(p->p_vmspace->vm_map.pmap,
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vaddr, &curaddr);
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else
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(void) pmap_extract(pmap_kernel(),vaddr, &curaddr);
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/*
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* Compute the segment size, and adjust counts.
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*/
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sgsize = NBPG - ((u_long)vaddr & PGOFSET);
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if (buflen < sgsize)
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sgsize = buflen;
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/*
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* Make sure we don't cross any boundaries.
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*/
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if (map->_dm_boundary > 0) {
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baddr = (curaddr + map->_dm_boundary) & bmask;
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if (sgsize > (baddr - curaddr))
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sgsize = (baddr - curaddr);
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}
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/*
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* Insert chunk into a segment, coalescing with
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* the previous segment if possible.
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*/
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if (first) {
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map->dm_segs[seg].ds_addr = curaddr;
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map->dm_segs[seg].ds_len = sgsize;
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first = 0;
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} else {
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if (curaddr == lastaddr &&
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(map->dm_segs[seg].ds_len + sgsize) <=
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map->_dm_maxsegsz &&
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(map->_dm_boundary == 0 ||
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(map->dm_segs[seg].ds_addr & bmask) ==
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(curaddr & bmask)))
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map->dm_segs[seg].ds_len += sgsize;
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else {
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if (++seg >= map->_dm_segcnt)
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break;
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map->dm_segs[seg].ds_addr = curaddr;
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map->dm_segs[seg].ds_len = sgsize;
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}
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}
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lastaddr = curaddr + sgsize;
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vaddr += sgsize;
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buflen -= sgsize;
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}
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*segp = seg;
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*lastaddrp = lastaddr;
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/*
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* Did we fit?
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*/
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if (buflen != 0) {
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/*
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* If there is a chained window, we will automatically
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* fall back to it.
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*/
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return (EFBIG); /* XXX better return value here? */
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}
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return (0);
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}
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/*
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* Common function for loading a direct-mapped DMA map with a linear
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* buffer. Called by bus-specific DMA map load functions with the
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* OR value appropriate for indicating "direct-mapped" for that
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* chipset.
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*/
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int
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_bus_dmamap_load_direct(t, map, buf, buflen, p, flags)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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void *buf;
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bus_size_t buflen;
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struct proc *p;
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int flags;
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{
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paddr_t lastaddr;
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int seg, error;
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/*
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* Make sure that on error condition we return "no valid mappings".
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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if (buflen > map->_dm_size)
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return (EINVAL);
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seg = 0;
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error = _bus_dmamap_load_buffer_direct_common(t, map, buf, buflen,
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p, flags, &lastaddr, &seg, 1);
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if (error == 0) {
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map->dm_mapsize = buflen;
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map->dm_nsegs = seg + 1;
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}
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return (error);
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for mbufs.
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*/
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int
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_bus_dmamap_load_mbuf_direct(t, map, m0, flags)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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struct mbuf *m0;
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int flags;
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{
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paddr_t lastaddr;
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int seg, error, first;
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struct mbuf *m;
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/*
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* Make sure that on error condition we return "no valid mappings."
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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#ifdef DIAGNOSTIC
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if ((m0->m_flags & M_PKTHDR) == 0)
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panic("_bus_dmamap_load_mbuf_direct_common: no packet header");
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#endif
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if (m0->m_pkthdr.len > map->_dm_size)
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return (EINVAL);
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first = 1;
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seg = 0;
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error = 0;
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for (m = m0; m != NULL && error == 0; m = m->m_next) {
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error = _bus_dmamap_load_buffer_direct_common(t, map,
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m->m_data, m->m_len, NULL, flags, &lastaddr, &seg, first);
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first = 0;
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}
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if (error == 0) {
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map->dm_mapsize = m0->m_pkthdr.len;
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map->dm_nsegs = seg + 1;
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}
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return (error);
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for uios.
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*/
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int
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_bus_dmamap_load_uio_direct(t, map, uio, flags)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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struct uio *uio;
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int flags;
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{
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paddr_t lastaddr;
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int seg, i, error, first;
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bus_size_t minlen, resid;
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struct proc *p = NULL;
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struct iovec *iov;
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caddr_t addr;
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/*
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* Make sure that on error condition we return "no valid mappings."
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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resid = uio->uio_resid;
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iov = uio->uio_iov;
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if (uio->uio_segflg == UIO_USERSPACE) {
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p = uio->uio_procp;
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#ifdef DIAGNOSTIC
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if (p == NULL)
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panic("_bus_dmamap_load_direct_common: USERSPACE but no proc");
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#endif
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}
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first = 1;
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seg = 0;
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error = 0;
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for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0; i++) {
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/*
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* Now at the first iovec to load. Load each iovec
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* until we have exhausted the residual count.
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*/
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minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
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addr = (caddr_t)iov[i].iov_base;
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error = _bus_dmamap_load_buffer_direct_common(t, map,
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addr, minlen, p, flags, &lastaddr, &seg, first);
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first = 0;
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resid -= minlen;
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}
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if (error == 0) {
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map->dm_mapsize = uio->uio_resid;
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map->dm_nsegs = seg + 1;
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}
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return (error);
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for raw memory.
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*/
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int
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_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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bus_dma_segment_t *segs;
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int nsegs;
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bus_size_t size;
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int flags;
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{
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/* @@@ This routine doesn't enforce map boundary requirement
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* @@@ perhaps it should return an error instead of panicing
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*/
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#ifdef DIAGNOSTIC
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if (map->_dm_size < size) {
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panic("_bus_dmamap_load_raw_direct: size is too large for map");
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}
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if (map->_dm_segcnt < nsegs) {
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panic("_bus_dmamap_load_raw_direct: too many segments for map");
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}
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#endif
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{
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int i;
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for (i=0;i<nsegs;i++) {
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#ifdef DIAGNOSTIC
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if (map->_dm_maxsegsz < map->dm_segs[i].ds_len) {
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panic("_bus_dmamap_load_raw_direct: segment too large for map");
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}
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#endif
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map->dm_segs[i] = segs[i];
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}
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}
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map->dm_nsegs = nsegs;
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map->dm_mapsize = size;
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return (0);
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}
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/*
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* Common function for unloading a DMA map. May be called by
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* chipset-specific DMA map unload functions.
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*/
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void
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_bus_dmamap_unload(t, map)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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{
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/*
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* No resources to free; just mark the mappings as
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* invalid.
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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}
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/*
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* Common function for DMA map synchronization. May be called
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* by chipset-specific DMA map synchronization functions.
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*/
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void
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_bus_dmamap_sync(t, map, offset, len, ops)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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bus_addr_t offset;
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bus_size_t len;
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int ops;
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{
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/* flush/purge the cache.
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* assumes pointers are aligned
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* @@@ should probably be fixed to use offset and len args.
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*/
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if (ops & BUS_DMASYNC_PREWRITE) {
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int i;
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for(i=0;i<map->dm_nsegs;i++) {
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bus_addr_t p = map->dm_segs[i].ds_addr;
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bus_addr_t e = p+map->dm_segs[i].ds_len;
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#ifdef DIAGNOSTIC
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if ((p % 16) || (e % 16)) {
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panic("unaligned address in _bus_dmamap_sync while flushing.\n"
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"address=0x%08x, end=0x%08x, ops=0x%x",p,e,ops);
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}
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#endif
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while((p<e)&&(p%NBPG)) {
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DCFL(p); /* flush cache line */
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p += 16;
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}
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while(p+NBPG<=e) {
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DCFP(p); /* flush page */
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p += NBPG;
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}
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while(p<e) {
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DCFL(p); /* flush cache line */
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p += 16;
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}
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#ifdef DIAGNOSTIC
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if (p != e) {
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panic("overrun in _bus_dmamap_sync while flushing.\n"
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"address=0x%08x, end=0x%08x, ops=0x%x",p,e,ops);
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}
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#endif
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}
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}
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if (ops & BUS_DMASYNC_PREREAD) {
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int i;
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for(i=0;i<map->dm_nsegs;i++) {
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bus_addr_t p = map->dm_segs[i].ds_addr;
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bus_addr_t e = p+map->dm_segs[i].ds_len;
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#ifdef DIAGNOSTIC
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if ((p % 16) || (e % 16)) {
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panic("unaligned address in _bus_dmamap_sync while purging.\n"
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"address=0x%08x, end=0x%08x, ops=0x%x", p,e,ops);
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}
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#endif
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while((p<e)&&(p%NBPG)) {
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DCPL(p); /* purge cache line */
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p += 16;
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}
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while(p+NBPG<=e) {
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DCPP(p); /* purge page */
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p += NBPG;
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}
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while(p<e) {
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DCPL(p); /* purge cache line */
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p += 16;
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}
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#ifdef DIAGNOSTIC
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if (p != e) {
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panic("overrun in _bus_dmamap_sync while flushing.\n"
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"address=0x%08x, end=0x%08x, ops=0x%x",p,e,ops);
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}
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#endif
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}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Common function for DMA-safe memory allocation. May be called
|
|
* by bus-specific DMA memory allocation functions.
|
|
*/
|
|
int
|
|
_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
|
|
bus_dma_tag_t t;
|
|
bus_size_t size, alignment, boundary;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
int *rsegs;
|
|
int flags;
|
|
{
|
|
extern paddr_t avail_start, avail_end;
|
|
paddr_t curaddr, lastaddr, high;
|
|
vm_page_t m;
|
|
struct pglist mlist;
|
|
int curseg, error;
|
|
|
|
/* Always round the size. */
|
|
size = round_page(size);
|
|
|
|
high = avail_end - PAGE_SIZE;
|
|
|
|
/*
|
|
* Allocate pages from the VM system.
|
|
*/
|
|
TAILQ_INIT(&mlist);
|
|
error = uvm_pglistalloc(size, avail_start, high, alignment, boundary,
|
|
&mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Compute the location, size, and number of segments actually
|
|
* returned by the VM code.
|
|
*/
|
|
m = mlist.tqh_first;
|
|
curseg = 0;
|
|
lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
|
|
segs[curseg].ds_len = PAGE_SIZE;
|
|
m = m->pageq.tqe_next;
|
|
|
|
for (; m != NULL; m = m->pageq.tqe_next) {
|
|
curaddr = VM_PAGE_TO_PHYS(m);
|
|
#ifdef DIAGNOSTIC
|
|
if (curaddr < avail_start || curaddr >= high) {
|
|
printf("uvm_pglistalloc returned non-sensical"
|
|
" address 0x%lx\n", curaddr);
|
|
panic("_bus_dmamem_alloc");
|
|
}
|
|
#endif
|
|
if (curaddr == (lastaddr + PAGE_SIZE))
|
|
segs[curseg].ds_len += PAGE_SIZE;
|
|
else {
|
|
curseg++;
|
|
segs[curseg].ds_addr = curaddr;
|
|
segs[curseg].ds_len = PAGE_SIZE;
|
|
}
|
|
lastaddr = curaddr;
|
|
}
|
|
|
|
*rsegs = curseg + 1;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common function for freeing DMA-safe memory. May be called by
|
|
* bus-specific DMA memory free functions.
|
|
*/
|
|
void
|
|
_bus_dmamem_free(t, segs, nsegs)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
{
|
|
vm_page_t m;
|
|
bus_addr_t addr;
|
|
struct pglist mlist;
|
|
int curseg;
|
|
|
|
/*
|
|
* Build a list of pages to free back to the VM system.
|
|
*/
|
|
TAILQ_INIT(&mlist);
|
|
for (curseg = 0; curseg < nsegs; curseg++) {
|
|
for (addr = segs[curseg].ds_addr;
|
|
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
|
|
addr += PAGE_SIZE) {
|
|
m = PHYS_TO_VM_PAGE(addr);
|
|
TAILQ_INSERT_TAIL(&mlist, m, pageq);
|
|
}
|
|
}
|
|
|
|
uvm_pglistfree(&mlist);
|
|
}
|
|
|
|
/*
|
|
* Common function for mapping DMA-safe memory. May be called by
|
|
* bus-specific DMA memory map functions.
|
|
*/
|
|
int
|
|
_bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
size_t size;
|
|
caddr_t *kvap;
|
|
int flags;
|
|
{
|
|
vaddr_t va;
|
|
bus_addr_t addr;
|
|
int curseg;
|
|
|
|
size = round_page(size);
|
|
|
|
va = uvm_km_valloc(kernel_map, size);
|
|
|
|
if (va == 0)
|
|
return (ENOMEM);
|
|
|
|
*kvap = (caddr_t)va;
|
|
|
|
for (curseg = 0; curseg < nsegs; curseg++) {
|
|
for (addr = segs[curseg].ds_addr;
|
|
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
|
|
addr += NBPG, va += NBPG, size -= NBPG) {
|
|
if (size == 0)
|
|
panic("_bus_dmamem_map: size botch");
|
|
pmap_enter(pmap_kernel(), va, addr,
|
|
VM_PROT_READ | VM_PROT_WRITE,
|
|
VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common function for unmapping DMA-safe memory. May be called by
|
|
* bus-specific DMA memory unmapping functions.
|
|
*/
|
|
void
|
|
_bus_dmamem_unmap(t, kva, size)
|
|
bus_dma_tag_t t;
|
|
caddr_t kva;
|
|
size_t size;
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((u_long)kva & PGOFSET)
|
|
panic("_bus_dmamem_unmap");
|
|
#endif
|
|
|
|
size = round_page(size);
|
|
uvm_km_free(kernel_map, (vaddr_t)kva, size);
|
|
}
|
|
|
|
/*
|
|
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
|
|
* bus-specific DMA mmap(2)'ing functions.
|
|
*/
|
|
paddr_t
|
|
_bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
off_t off;
|
|
int prot, flags;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nsegs; i++) {
|
|
#ifdef DIAGNOSTIC
|
|
if (off & PGOFSET)
|
|
panic("_bus_dmamem_mmap: offset unaligned");
|
|
if (segs[i].ds_addr & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment unaligned");
|
|
if (segs[i].ds_len & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment size not multiple"
|
|
" of page size");
|
|
#endif
|
|
if (off >= segs[i].ds_len) {
|
|
off -= segs[i].ds_len;
|
|
continue;
|
|
}
|
|
|
|
return (m68k_btop((caddr_t)segs[i].ds_addr + off));
|
|
}
|
|
|
|
/* Page not found. */
|
|
return (-1);
|
|
}
|