/* $SourceForge: bktr_mem.c,v 1.3 2003/03/11 23:11:25 thomasklausner Exp $ */

/* $SourceForge: bktr_mem.c,v 1.3 2003/03/11 23:11:25 thomasklausner Exp $ */

/* $NetBSD: bktr_mem.c,v 1.5 2009/03/18 16:00:19 cegger Exp $ */
/* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.4 2000/09/11 12:23:50 roger Exp$ */

/*
* This is prt of the Driver for Video Capture Cards (Frame grabbers)
* and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
* chipset.
* Copyright Roger Hardiman.
*
* bktr_mem : This kernel module allows us to keep our allocated
* contiguous memory for the video buffer, DMA programs and VBI data
* while the main bktr driver is unloaded and reloaded.
* This avoids the problem of trying to allocate contiguous each
* time the bktr driver is loaded.
*/

/*
* 1. Redistributions of source code must retain the
* Copyright (c) 2000 Roger Hardiman
* All rights reserved.
*
* 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 Roger Hardiman
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bktr_mem.c,v 1.5 2009/03/18 16:00:19 cegger Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <stdio.h>
#include <string.h>
#include <dev/bktr/bktr_mem.h>

struct memory_pointers {
int addresses_stored;
vm_offset_t dma_prog;
vm_offset_t odd_dma_prog;
vm_offset_t vbidata;
vm_offset_t vbibuffer;
vm_offset_t buf;
} memory_pointers;

static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];

/*************************************************************/

static int
bktr_mem_modevent(module_t mod, int type, void *unused) {

switch (type) {
case MOD_LOAD:
{
printf("bktr_mem: memory holder loaded\n");
/*
* bzero causes a panic.
memset((void *)memory_list, 0, sizeof(memory_list));
* So use a simple for loop for now.
*/
{int x;
unsigned char *d = (unsigned char *)memory_list;
for (x=0; x< sizeof(memory_list); x++) {
d[x]=0;
}
}
return 0;
}
case MOD_UNLOAD:
{
printf("bktr_mem: memory holder cannot be unloaded\n");
return EBUSY;
}
default:
break;
}
return 0;
};

/*************************************************************/

int
bktr_has_stored_addresses(int unit) {

if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
printf("bktr_mem: Unit number %d invalid\n",unit);
return 0;
}

return memory_list[unit].addresses_stored;
}

/*************************************************************/

void
bktr_store_address(int unit, int type, vm_offset_t addr) {

if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n"
,unit,type,addr);
return;
}

switch (type) {
case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr;
memory_list[unit].addresses_stored = 1;
break;
case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr;
memory_list[unit].addresses_stored = 1;
break;
case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr;
memory_list[unit].addresses_stored = 1;
break;
case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr;
memory_list[unit].addresses_stored = 1;
break;
case BKTR_MEM_BUF: memory_list[unit].buf = addr;
memory_list[unit].addresses_stored = 1;
break;
default: printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn",
type,unit,addr);
break;
}
}

/*************************************************************/

vm_offset_t
bktr_retrieve_address(int unit, int type) {

if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type);
return NULL;
}
switch (type) {
case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog;
case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog;
case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata;
case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer;
case BKTR_MEM_BUF: return memory_list[unit].buf;
default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit);
return NULL;
}
}

/*************************************************************/

static moduledata_t bktr_mem_mod = {
"bktr_mem",
bktr_mem_modevent,
0
};
/* The load order is First and module type is Driver to make sure bktr_mem
loads (and initialises) before bktr when both are loaded together */
DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
MODULE_VERSION(bktr_mem, 1);