1/* 2 * This is part of the Driver for Video Capture Cards (Frame grabbers) 3 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879 4 * chipset. 5 * Copyright Roger Hardiman. 6 * 7 * bktr_mem : This kernel module allows us to keep our allocated 8 * contiguous memory for the video buffer, DMA programs and VBI data 9 * while the main bktr driver is unloaded and reloaded. 10 * This avoids the problem of trying to allocate contiguous each 11 * time the bktr driver is loaded. 12 */ 13 14/*- 15 * 1. Redistributions of source code must retain the 16 * Copyright (c) 2000 Roger Hardiman 17 * All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 3. All advertising materials mentioning features or use of this software 28 * must display the following acknowledgement: 29 * This product includes software developed by Roger Hardiman 30 * 4. The name of the author may not be used to endorse or promote products 31 * derived from this software without specific prior written permission. 32 * 33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 34 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 35 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 36 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 42 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 43 * POSSIBILITY OF SUCH DAMAGE. 44 */ 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD$"); 48 49#include <sys/param.h> 50#include <sys/kernel.h> 51#include <sys/module.h> 52#include <sys/systm.h> 53#include <dev/bktr/bktr_mem.h> 54 55struct 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 64static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES]; 65 66/*************************************************************/ 67 68static int 69bktr_mem_modevent(module_t mod, int type, void *unused){ 70 71 switch (type) { 72 case MOD_LOAD: 73 printf("bktr_mem: memory holder loaded\n"); 74 /* 75 * bzero((caddr_t)memory_list, sizeof(memory_list)); 76 * causes a panic. So use a simple for loop for now. 77 */ 78 { 79 int x; 80 unsigned char *d; 81 82 d = (unsigned char *)memory_list; 83 for (x = 0; x < sizeof(memory_list); x++) 84 d[x] = 0; 85 } 86 return 0; 87 case MOD_UNLOAD: 88 printf("bktr_mem: memory holder cannot be unloaded\n"); 89 return EBUSY; 90 default: 91 return EOPNOTSUPP; 92 break; 93 } 94 return (0); 95} 96 97/*************************************************************/ 98 99int 100bktr_has_stored_addresses(int unit) 101{ 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 113void 114bktr_store_address(int unit, int type, vm_offset_t addr) 115{ 116 117 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { 118 printf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n", 119 unit, type, (void *) addr); 120 return; 121 } 122 123 switch (type) { 124 case BKTR_MEM_DMA_PROG: 125 memory_list[unit].dma_prog = addr; 126 memory_list[unit].addresses_stored = 1; 127 break; 128 case BKTR_MEM_ODD_DMA_PROG: 129 memory_list[unit].odd_dma_prog = addr; 130 memory_list[unit].addresses_stored = 1; 131 break; 132 case BKTR_MEM_VBIDATA: 133 memory_list[unit].vbidata = addr; 134 memory_list[unit].addresses_stored = 1; 135 break; 136 case BKTR_MEM_VBIBUFFER: 137 memory_list[unit].vbibuffer = addr; 138 memory_list[unit].addresses_stored = 1; 139 break; 140 case BKTR_MEM_BUF: 141 memory_list[unit].buf = addr; 142 memory_list[unit].addresses_stored = 1; 143 break; 144 default: 145 printf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n", 146 type, unit, (void *)addr); 147 break; 148 } 149} 150 151/*************************************************************/ 152 153vm_offset_t 154bktr_retrieve_address(int unit, int type) 155{ 156 157 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) { 158 printf("bktr_mem: Unit number %d too large for memory type %d\n", 159 unit, type); 160 return (0); 161 } 162 switch (type) { 163 case BKTR_MEM_DMA_PROG: 164 return memory_list[unit].dma_prog; 165 case BKTR_MEM_ODD_DMA_PROG: 166 return memory_list[unit].odd_dma_prog; 167 case BKTR_MEM_VBIDATA: 168 return memory_list[unit].vbidata; 169 case BKTR_MEM_VBIBUFFER: 170 return memory_list[unit].vbibuffer; 171 case BKTR_MEM_BUF: 172 return memory_list[unit].buf; 173 default: 174 printf("bktr_mem: Invalid memory type %d for bktr%d", 175 type, unit); 176 return (0); 177 } 178} 179 180/*************************************************************/ 181 182static moduledata_t bktr_mem_mod = { 183 "bktr_mem", 184 bktr_mem_modevent, 185 0 186}; 187 188/* 189 * The load order is First and module type is Driver to make sure bktr_mem 190 * loads (and initialises) before bktr when both are loaded together. 191 */ 192DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 193MODULE_VERSION(bktr_mem, 1); 194