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/* $OpenBSD: sgmap_common.c,v 1.4 2002/03/20 22:48:58 art Exp $ */
/* $NetBSD: sgmap_common.c,v 1.13 2000/06/29 09:02:57 mrg Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <uvm/uvm_extern.h>
#include <machine/bus.h>
#include <alpha/dev/sgmapvar.h>
/*
* Some systems will prefetch the next page during a memory -> device DMA.
* This can cause machine checks if there is not a spill page after the
* last page of the DMA (thus avoiding hitting an invalid SGMAP PTE).
*/
vaddr_t alpha_sgmap_prefetch_spill_page_va;
bus_addr_t alpha_sgmap_prefetch_spill_page_pa;
void
alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva,
minptalign)
bus_dma_tag_t t;
struct alpha_sgmap *sgmap;
const char *name;
bus_addr_t wbase;
bus_addr_t sgvabase;
bus_size_t sgvasize;
size_t ptesize;
void *ptva;
bus_size_t minptalign;
{
bus_dma_segment_t seg;
size_t ptsize;
int rseg;
if (sgvasize & PGOFSET) {
printf("size botch for sgmap `%s'\n", name);
goto die;
}
sgmap->aps_wbase = wbase;
sgmap->aps_sgvabase = sgvabase;
sgmap->aps_sgvasize = sgvasize;
if (ptva != NULL) {
/*
* We already have a page table; this may be a system
* where the page table resides in bridge-resident SRAM.
*/
sgmap->aps_pt = ptva;
sgmap->aps_ptpa = 0;
} else {
/*
* Compute the page table size and allocate it. At minimum,
* this must be aligned to the page table size. However,
* some platforms have more strict alignment reqirements.
*/
ptsize = (sgvasize / NBPG) * ptesize;
if (minptalign != 0) {
if (minptalign < ptsize)
minptalign = ptsize;
} else
minptalign = ptsize;
if (bus_dmamem_alloc(t, ptsize, minptalign, 0, &seg, 1, &rseg,
BUS_DMA_NOWAIT)) {
panic("unable to allocate page table for sgmap `%s'\n",
name);
goto die;
}
sgmap->aps_ptpa = seg.ds_addr;
sgmap->aps_pt = (caddr_t)ALPHA_PHYS_TO_K0SEG(sgmap->aps_ptpa);
}
/*
* Create the extent map used to manage the virtual address
* space.
*/
sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1,
M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE);
if (sgmap->aps_ex == NULL) {
printf("unable to create extent map for sgmap `%s'\n",
name);
goto die;
}
/*
* Allocate a spill page if that hasn't already been done.
*/
if (alpha_sgmap_prefetch_spill_page_va == 0) {
if (bus_dmamem_alloc(t, NBPG, 0, 0, &seg, 1, &rseg,
BUS_DMA_NOWAIT)) {
printf("unable to allocate spill page for sgmap `%s'\n",
name);
goto die;
}
alpha_sgmap_prefetch_spill_page_pa = seg.ds_addr;
alpha_sgmap_prefetch_spill_page_va =
ALPHA_PHYS_TO_K0SEG(alpha_sgmap_prefetch_spill_page_pa);
bzero((caddr_t)alpha_sgmap_prefetch_spill_page_va, NBPG);
}
return;
die:
panic("alpha_sgmap_init");
}
int
alpha_sgmap_alloc(map, origlen, sgmap, flags)
bus_dmamap_t map;
bus_size_t origlen;
struct alpha_sgmap *sgmap;
int flags;
{
int error;
bus_size_t len = origlen, boundary, alignment;
int s;
#ifdef DIAGNOSTIC
if (map->_dm_flags & DMAMAP_HAS_SGMAP)
panic("alpha_sgmap_alloc: already have sgva space");
#endif
/*
* Add a range for spill page.
*/
len += NBPG;
/*
* And add an additional amount in case of ALLOCNOW.
*/
if (flags & BUS_DMA_ALLOCNOW)
len += NBPG;
map->_dm_sgvalen = round_page(len);
/*
* ARGH! If the addition of spill pages bumped us over our
* boundary, we have to 2x the boundary limit.
*/
boundary = map->_dm_boundary;
if (boundary && boundary < map->_dm_sgvalen) {
alignment = boundary;
do {
boundary <<= 1;
} while (boundary < map->_dm_sgvalen);
} else
alignment = NBPG;
#if 0
printf("len %x -> %x, _dm_sgvalen %x _dm_boundary %x boundary %x -> ",
origlen, len, map->_dm_sgvalen, map->_dm_boundary, boundary);
#endif
s = splvm();
error = extent_alloc(sgmap->aps_ex, map->_dm_sgvalen, alignment, 0,
boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : EX_WAITOK,
&map->_dm_sgva);
splx(s);
#if 0
printf("error %d _dm_sgva %x\n", error, map->_dm_sgva);
#endif
if (error == 0)
map->_dm_flags |= DMAMAP_HAS_SGMAP;
else
map->_dm_flags &= ~DMAMAP_HAS_SGMAP;
return (error);
}
void
alpha_sgmap_free(map, sgmap)
bus_dmamap_t map;
struct alpha_sgmap *sgmap;
{
int s;
#ifdef DIAGNOSTIC
if ((map->_dm_flags & DMAMAP_HAS_SGMAP) == 0)
panic("alpha_sgmap_free: no sgva space to free");
#endif
s = splvm();
if (extent_free(sgmap->aps_ex, map->_dm_sgva, map->_dm_sgvalen,
EX_NOWAIT))
panic("alpha_sgmap_free");
splx(s);
map->_dm_flags &= ~DMAMAP_HAS_SGMAP;
}
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