bktr_mem.c revision 1.1
1 /* $NetBSD: bktr_mem.c,v 1.1 2000/10/28 14:17:40 wiz Exp $ */ 2 3 /* FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.4 2000/09/11 12:23:50 roger Exp */ 4 5 /* 6 * This is prt of the Driver for Video Capture Cards (Frame grabbers) 7 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879 8 * chipset. 9 * Copyright Roger Hardiman. 10 * 11 * bktr_mem : This kernel module allows us to keep our allocated 12 * contiguous memory for the video buffer, DMA programs and VBI data 13 * while the main bktr driver is unloaded and reloaded. 14 * This avoids the problem of trying to allocate contiguous each 15 * time the bktr driver is loaded. 16 */ 17 18 /* 19 * 1. Redistributions of source code must retain the 20 * Copyright (c) 2000 Roger Hardiman 21 * All rights reserved. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * This product includes software developed by Roger Hardiman 34 * 4. The name of the author may not be used to endorse or promote products 35 * derived from this software without specific prior written permission. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 38 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 39 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 41 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 42 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 43 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 46 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 47 * POSSIBILITY OF SUCH DAMAGE. 48 */ 49 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <stdio.h> 54 #include <string.h> 55 #include <dev/bktr/bktr_mem.h> 56 57 struct memory_pointers { 58 int addresses_stored; 59 vm_offset_t dma_prog; 60 vm_offset_t odd_dma_prog; 61 vm_offset_t vbidata; 62 vm_offset_t vbibuffer; 63 vm_offset_t buf; 64 } memory_pointers; 65 66 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES]; 67 68 /*************************************************************/ 69 70 static int 71 bktr_mem_modevent(module_t mod, int type, void *unused){ 72 73 switch (type) { 74 case MOD_LOAD: 75 { 76 printf("bktr_mem: memory holder loaded\n"); 77 /* 78 * bzero causes a panic. 79 bzero((caddr_t)memory_list, sizeof(memory_list)); 80 * So use a simple for loop for now. 81 */ 82 {int x; 83 unsigned char *d = (unsigned char *)memory_list; 84 for (x=0; x< sizeof(memory_list); x++) { 85 d[x]=0; 86 } 87 } 88 return 0; 89 } 90 case MOD_UNLOAD: 91 { 92 printf("bktr_mem: memory holder cannot be unloaded\n"); 93 return EBUSY; 94 } 95 default: 96 break; 97 } 98 return 0; 99 }; 100 101 /*************************************************************/ 102 103 int 104 bktr_has_stored_addresses(int unit) { 105 106 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 107 printf("bktr_mem: Unit number %d invalid\n",unit); 108 return 0; 109 } 110 111 return memory_list[unit].addresses_stored; 112 } 113 114 /*************************************************************/ 115 116 void 117 bktr_store_address(int unit, int type, vm_offset_t addr) { 118 119 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 120 printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n" 121 ,unit,type,addr); 122 return; 123 } 124 125 switch (type) { 126 case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr; 127 memory_list[unit].addresses_stored = 1; 128 break; 129 case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr; 130 memory_list[unit].addresses_stored = 1; 131 break; 132 case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr; 133 memory_list[unit].addresses_stored = 1; 134 break; 135 case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr; 136 memory_list[unit].addresses_stored = 1; 137 break; 138 case BKTR_MEM_BUF: memory_list[unit].buf = addr; 139 memory_list[unit].addresses_stored = 1; 140 break; 141 default: printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn", 142 type,unit,addr); 143 break; 144 } 145 } 146 147 /*************************************************************/ 148 149 vm_offset_t 150 bktr_retrieve_address(int unit, int type) { 151 152 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 153 printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type); 154 return NULL; 155 } 156 switch (type) { 157 case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog; 158 case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog; 159 case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata; 160 case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer; 161 case BKTR_MEM_BUF: return memory_list[unit].buf; 162 default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit); 163 return NULL; 164 } 165 } 166 167 /*************************************************************/ 168 169 static moduledata_t bktr_mem_mod = { 170 "bktr_mem", 171 bktr_mem_modevent, 172 0 173 }; 174 /* The load order is First and module type is Driver to make sure bktr_mem 175 loads (and initialises) before bktr when both are loaded together */ 176 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 177 MODULE_VERSION(bktr_mem, 1); 178
Indexes created Tue Sep 30 20:09:53 GMT 2025