95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
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/*
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*
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Copyright (c) Eicon Networks, 2002.
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*
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This source file is supplied for the use with
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Eicon Networks range of DIVA Server Adapters.
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*
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Eicon File Revision : 2.1
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*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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*
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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*
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "platform.h"
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#include "diva_dma.h"
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/*
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Every entry has length of PAGE_SIZE
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and represents one single physical page
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*/
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struct _diva_dma_map_entry {
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int busy;
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dword phys_bus_addr; /* 32bit address as seen by the card */
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void *local_ram_addr; /* local address as seen by the host */
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void *addr_handle; /* handle uset to free allocated memory */
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};
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/*
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Create local mapping structure and init it to default state
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*/
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struct _diva_dma_map_entry *diva_alloc_dma_map(void *os_context, int nentries) {
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diva_dma_map_entry_t *pmap = diva_os_malloc(0, sizeof(*pmap) * (nentries + 1));
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if (pmap)
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memset(pmap, 0, sizeof(*pmap) * (nentries + 1));
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return pmap;
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}
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/*
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Free local map (context should be freed before) if any
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*/
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void diva_free_dma_mapping(struct _diva_dma_map_entry *pmap) {
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if (pmap) {
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diva_os_free(0, pmap);
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}
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}
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/*
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Set information saved on the map entry
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*/
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void diva_init_dma_map_entry(struct _diva_dma_map_entry *pmap,
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int nr, void *virt, dword phys,
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void *addr_handle) {
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pmap[nr].phys_bus_addr = phys;
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pmap[nr].local_ram_addr = virt;
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pmap[nr].addr_handle = addr_handle;
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}
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/*
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Allocate one single entry in the map
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*/
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int diva_alloc_dma_map_entry(struct _diva_dma_map_entry *pmap) {
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int i;
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for (i = 0; (pmap && pmap[i].local_ram_addr); i++) {
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if (!pmap[i].busy) {
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pmap[i].busy = 1;
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return (i);
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}
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}
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return (-1);
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}
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/*
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Free one single entry in the map
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*/
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void diva_free_dma_map_entry(struct _diva_dma_map_entry *pmap, int nr) {
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pmap[nr].busy = 0;
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}
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/*
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Get information saved on the map entry
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*/
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void diva_get_dma_map_entry(struct _diva_dma_map_entry *pmap, int nr,
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void **pvirt, dword *pphys) {
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*pphys = pmap[nr].phys_bus_addr;
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*pvirt = pmap[nr].local_ram_addr;
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}
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void *diva_get_entry_handle(struct _diva_dma_map_entry *pmap, int nr) {
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return (pmap[nr].addr_handle);
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}
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