181 lines
6.2 KiB
C
181 lines
6.2 KiB
C
/* $SourceForge: bktr_mem.c,v 1.3 2003/03/11 23:11:25 thomasklausner Exp $ */
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/* $NetBSD: bktr_mem.c,v 1.5 2009/03/18 16:00:19 cegger Exp $ */
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/* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.4 2000/09/11 12:23:50 roger Exp$ */
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/*
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* This is prt of the Driver for Video Capture Cards (Frame grabbers)
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* and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
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* chipset.
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* Copyright Roger Hardiman.
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*
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* bktr_mem : This kernel module allows us to keep our allocated
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* contiguous memory for the video buffer, DMA programs and VBI data
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* while the main bktr driver is unloaded and reloaded.
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* This avoids the problem of trying to allocate contiguous each
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* time the bktr driver is loaded.
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*/
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/*
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* 1. Redistributions of source code must retain the
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* Copyright (c) 2000 Roger Hardiman
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Roger Hardiman
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bktr_mem.c,v 1.5 2009/03/18 16:00:19 cegger Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <stdio.h>
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#include <string.h>
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#include <dev/bktr/bktr_mem.h>
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struct memory_pointers {
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int addresses_stored;
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vm_offset_t dma_prog;
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vm_offset_t odd_dma_prog;
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vm_offset_t vbidata;
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vm_offset_t vbibuffer;
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vm_offset_t buf;
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} memory_pointers;
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static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
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/*************************************************************/
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static int
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bktr_mem_modevent(module_t mod, int type, void *unused) {
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switch (type) {
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case MOD_LOAD:
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{
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printf("bktr_mem: memory holder loaded\n");
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/*
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* bzero causes a panic.
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memset((void *)memory_list, 0, sizeof(memory_list));
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* So use a simple for loop for now.
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*/
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{int x;
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unsigned char *d = (unsigned char *)memory_list;
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for (x=0; x< sizeof(memory_list); x++) {
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d[x]=0;
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}
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}
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return 0;
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}
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case MOD_UNLOAD:
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{
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printf("bktr_mem: memory holder cannot be unloaded\n");
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return EBUSY;
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}
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default:
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break;
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}
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return 0;
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};
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/*************************************************************/
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int
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bktr_has_stored_addresses(int unit) {
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if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
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printf("bktr_mem: Unit number %d invalid\n",unit);
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return 0;
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}
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return memory_list[unit].addresses_stored;
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}
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/*************************************************************/
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void
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bktr_store_address(int unit, int type, vm_offset_t addr) {
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if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
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printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n"
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,unit,type,addr);
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return;
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}
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switch (type) {
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case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr;
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memory_list[unit].addresses_stored = 1;
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break;
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case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr;
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memory_list[unit].addresses_stored = 1;
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break;
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case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr;
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memory_list[unit].addresses_stored = 1;
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break;
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case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr;
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memory_list[unit].addresses_stored = 1;
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break;
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case BKTR_MEM_BUF: memory_list[unit].buf = addr;
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memory_list[unit].addresses_stored = 1;
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break;
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default: printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn",
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type,unit,addr);
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break;
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}
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}
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/*************************************************************/
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vm_offset_t
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bktr_retrieve_address(int unit, int type) {
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if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
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printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type);
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return NULL;
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}
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switch (type) {
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case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog;
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case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog;
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case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata;
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case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer;
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case BKTR_MEM_BUF: return memory_list[unit].buf;
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default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit);
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return NULL;
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}
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}
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/*************************************************************/
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static moduledata_t bktr_mem_mod = {
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"bktr_mem",
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bktr_mem_modevent,
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0
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};
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/* The load order is First and module type is Driver to make sure bktr_mem
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loads (and initialises) before bktr when both are loaded together */
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DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
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MODULE_VERSION(bktr_mem, 1);
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