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/*
* This is part 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.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((caddr_t)memory_list, sizeof(memory_list));
* causes a panic. So use a simple for loop for now.
*/
{
int x;
unsigned char *d;
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:
return EOPNOTSUPP;
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 (0);
}
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 (0);
}
}
/*************************************************************/
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);
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