1 /* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.13 2005/01/27 01:40:12 imp Exp */ 2 /* $DragonFly: src/sys/dev/video/bktr/bktr_mem.c,v 1.8 2007/10/03 19:27:08 swildner Exp $ */ 3 4 /* 5 * This is part 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 <sys/systm.h> 53 #include <dev/video/bktr/bktr_mem.h> 54 55 struct memory_pointers { 56 int addresses_stored; 57 vm_offset_t dma_prog; 58 vm_offset_t odd_dma_prog; 59 vm_offset_t vbidata; 60 vm_offset_t vbibuffer; 61 vm_offset_t buf; 62 } memory_pointers; 63 64 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES]; 65 66 /*************************************************************/ 67 68 static int 69 bktr_mem_modevent(module_t mod, int type, void *unused) 70 { 71 72 switch (type) { 73 case MOD_LOAD: 74 kprintf("bktr_mem: memory holder loaded\n"); 75 bzero(memory_list, sizeof(memory_list)); 76 return 0; 77 case MOD_UNLOAD: 78 kprintf("bktr_mem: memory holder cannot be unloaded\n"); 79 return EBUSY; 80 default: 81 return EOPNOTSUPP; 82 break; 83 } 84 }; 85 86 /*************************************************************/ 87 88 int 89 bktr_has_stored_addresses(int unit) 90 { 91 92 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { 93 kprintf("bktr_mem: Unit number %d invalid\n",unit); 94 return 0; 95 } 96 97 return memory_list[unit].addresses_stored; 98 } 99 100 /*************************************************************/ 101 102 void 103 bktr_store_address(int unit, int type, vm_offset_t addr) 104 { 105 106 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { 107 kprintf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n", 108 unit, type, (void *)addr); 109 return; 110 } 111 112 switch (type) { 113 case BKTR_MEM_DMA_PROG: 114 memory_list[unit].dma_prog = addr; 115 memory_list[unit].addresses_stored = 1; 116 break; 117 case BKTR_MEM_ODD_DMA_PROG: 118 memory_list[unit].odd_dma_prog = addr; 119 memory_list[unit].addresses_stored = 1; 120 break; 121 case BKTR_MEM_VBIDATA: 122 memory_list[unit].vbidata = addr; 123 memory_list[unit].addresses_stored = 1; 124 break; 125 case BKTR_MEM_VBIBUFFER: 126 memory_list[unit].vbibuffer = addr; 127 memory_list[unit].addresses_stored = 1; 128 break; 129 case BKTR_MEM_BUF: 130 memory_list[unit].buf = addr; 131 memory_list[unit].addresses_stored = 1; 132 break; 133 default: 134 kprintf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n", 135 type, unit, (void *)addr); 136 break; 137 } 138 } 139 140 /*************************************************************/ 141 142 vm_offset_t 143 bktr_retrieve_address(int unit, int type) 144 { 145 146 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { 147 kprintf("bktr_mem: Unit number %d too large for memory type %d\n", 148 unit, type); 149 return (0); 150 } 151 switch (type) { 152 case BKTR_MEM_DMA_PROG: 153 return memory_list[unit].dma_prog; 154 case BKTR_MEM_ODD_DMA_PROG: 155 return memory_list[unit].odd_dma_prog; 156 case BKTR_MEM_VBIDATA: 157 return memory_list[unit].vbidata; 158 case BKTR_MEM_VBIBUFFER: 159 return memory_list[unit].vbibuffer; 160 case BKTR_MEM_BUF: 161 return memory_list[unit].buf; 162 default: 163 kprintf("bktr_mem: Invalid memory type %d for bktr%d", 164 type, unit); 165 return (0); 166 } 167 } 168 169 /*************************************************************/ 170 171 static moduledata_t bktr_mem_mod = { 172 "bktr_mem", 173 bktr_mem_modevent, 174 0 175 }; 176 177 /* 178 * The load order is First and module type is Driver to make sure bktr_mem 179 * loads (and initialises) before bktr when both are loaded together. 180 */ 181 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 182 MODULE_VERSION(bktr_mem, 1); 183