/* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.13 2005/01/27 01:40:12 imp Exp */ /* $DragonFly: src/sys/dev/video/bktr/bktr_mem.c,v 1.8 2007/10/03 19:27:08 swildner Exp $ */ /* * 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/param.h> #include <sys/kernel.h> #include <sys/systm.h> #include <dev/video/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: kprintf("bktr_mem: memory holder loaded\n"); bzero(memory_list, sizeof(memory_list)); return 0; case MOD_UNLOAD: kprintf("bktr_mem: memory holder cannot be unloaded\n"); return EBUSY; default: return EOPNOTSUPP; break; } }; /*************************************************************/ int bktr_has_stored_addresses(int unit) { if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { kprintf("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) { kprintf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n", unit, type, (void *)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: kprintf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n", type, unit, (void *)addr); break; } } /*************************************************************/ vm_offset_t bktr_retrieve_address(int unit, int type) { if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { kprintf("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: kprintf("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);
