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