1 /* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.2.2.4 2001/10/09 04:08:41 jlemon Exp $ */ 2 /* $DragonFly: src/sys/dev/video/bktr/bktr_mem.c,v 1.2 2003/06/17 04:28:23 dillon Exp $ */ 3 4 /* 5 * This is prt of the Driver for Video Capture Cards (Frame grabbers) 6 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879 7 * chipset. 8 * Copyright Roger Hardiman. 9 * 10 * bktr_mem : This kernel module allows us to keep our allocated 11 * contiguous memory for the video buffer, DMA programs and VBI data 12 * while the main bktr driver is unloaded and reloaded. 13 * This avoids the problem of trying to allocate contiguous each 14 * time the bktr driver is loaded. 15 */ 16 17 /* 18 * 1. Redistributions of source code must retain the 19 * Copyright (c) 2000 Roger Hardiman 20 * All rights reserved. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * This product includes software developed by Roger Hardiman 33 * 4. The name of the author may not be used to endorse or promote products 34 * derived from this software without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 37 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 38 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 39 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 40 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 41 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 42 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 45 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 46 * POSSIBILITY OF SUCH DAMAGE. 47 */ 48 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <dev/bktr/bktr_mem.h> 53 54 struct memory_pointers { 55 int addresses_stored; 56 vm_offset_t dma_prog; 57 vm_offset_t odd_dma_prog; 58 vm_offset_t vbidata; 59 vm_offset_t vbibuffer; 60 vm_offset_t buf; 61 } memory_pointers; 62 63 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES]; 64 65 /*************************************************************/ 66 67 static int 68 bktr_mem_modevent(module_t mod, int type, void *unused){ 69 70 switch (type) { 71 case MOD_LOAD: 72 { 73 printf("bktr_mem: memory holder loaded\n"); 74 /* 75 * bzero causes a panic. 76 bzero((caddr_t)memory_list, sizeof(memory_list)); 77 * So use a simple for loop for now. 78 */ 79 {int x; 80 unsigned char *d = (unsigned char *)memory_list; 81 for (x=0; x< sizeof(memory_list); x++) { 82 d[x]=0; 83 } 84 } 85 return 0; 86 } 87 case MOD_UNLOAD: 88 { 89 printf("bktr_mem: memory holder cannot be unloaded\n"); 90 return EBUSY; 91 } 92 default: 93 break; 94 } 95 return 0; 96 }; 97 98 /*************************************************************/ 99 100 int 101 bktr_has_stored_addresses(int unit) { 102 103 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 104 printf("bktr_mem: Unit number %d invalid\n",unit); 105 return 0; 106 } 107 108 return memory_list[unit].addresses_stored; 109 } 110 111 /*************************************************************/ 112 113 void 114 bktr_store_address(int unit, int type, vm_offset_t addr) { 115 116 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 117 printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n" 118 ,unit,type,addr); 119 return; 120 } 121 122 switch (type) { 123 case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr; 124 memory_list[unit].addresses_stored = 1; 125 break; 126 case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr; 127 memory_list[unit].addresses_stored = 1; 128 break; 129 case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr; 130 memory_list[unit].addresses_stored = 1; 131 break; 132 case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr; 133 memory_list[unit].addresses_stored = 1; 134 break; 135 case BKTR_MEM_BUF: memory_list[unit].buf = addr; 136 memory_list[unit].addresses_stored = 1; 137 break; 138 default: printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn", 139 type,unit,addr); 140 break; 141 } 142 } 143 144 /*************************************************************/ 145 146 vm_offset_t 147 bktr_retrieve_address(int unit, int type) { 148 149 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) { 150 printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type); 151 return NULL; 152 } 153 switch (type) { 154 case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog; 155 case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog; 156 case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata; 157 case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer; 158 case BKTR_MEM_BUF: return memory_list[unit].buf; 159 default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit); 160 return NULL; 161 } 162 } 163 164 /*************************************************************/ 165 166 static moduledata_t bktr_mem_mod = { 167 "bktr_mem", 168 bktr_mem_modevent, 169 0 170 }; 171 /* The load order is First and module type is Driver to make sure bktr_mem 172 loads (and initialises) before bktr when both are loaded together */ 173 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 174 MODULE_VERSION(bktr_mem, 1); 175