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/* $OpenBSD: sgmap_common.c,v 1.10 2008/06/26 05:42:08 ray 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.
*
* 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.
*/
#define _ALPHA_BUS_DMA_PRIVATE
#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 requirements.
*/
ptsize = (sgvasize / PAGE_SIZE) * 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'",
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, PAGE_SIZE, 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, PAGE_SIZE);
}
return;
die:
panic("alpha_sgmap_init");
}
int
alpha_sgmap_dmamap_create(t, size, nsegments, maxsegsz, boundary,
flags, dmamp)
bus_dma_tag_t t;
bus_size_t size;
int nsegments;
bus_size_t maxsegsz;
bus_size_t boundary;
int flags;
bus_dmamap_t *dmamp;
{
bus_dmamap_t map;
int error;
error = _bus_dmamap_create(t, size, nsegments, maxsegsz,
boundary, flags, dmamp);
if (error)
return (error);
map = *dmamp;
/* XXX BUS_DMA_ALLOCNOW */
return (error);
}
void
alpha_sgmap_dmamap_destroy(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
KASSERT(map->dm_mapsize == 0);
_bus_dmamap_destroy(t, map);
}
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