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