sys/dev/pci/bktr/bktr_mem.c

   1 /* $SourceForge: bktr_mem.c,v 1.3 2003/03/11 23:11:25 thomasklausner Exp $ */
   2
   3 /*      $NetBSD: bktr_mem.c,v 1.4 2007/03/04 06:02:27 christos Exp $    */
   4 /* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.4 2000/09/11 12:23:50 roger Exp$ */
   5
   6 /*
   7  * This is prt of the Driver for Video Capture Cards (Frame grabbers)
   8  * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
   9  * chipset.
  10  * Copyright Roger Hardiman.
  11  *
  12  * bktr_mem : This kernel module allows us to keep our allocated
  13  *            contiguous memory for the video buffer, DMA programs and VBI data
  14  *            while the main bktr driver is unloaded and reloaded.
  15  *            This avoids the problem of trying to allocate contiguous each
  16  *            time the bktr driver is loaded.
  17  */
  18
  19 /*
  20  * 1. Redistributions of source code must retain the
  21  * Copyright (c) 2000 Roger Hardiman
  22  * All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by Roger Hardiman
  35  * 4. The name of the author may not be used to endorse or promote products
  36  *    derived from this software without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  39  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  40  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  41  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  42  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  43  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  44  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  46  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  47  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  48  * POSSIBILITY OF SUCH DAMAGE.
  49  */
  50
  51 #include <sys/cdefs.h>
  52 __KERNEL_RCSID(0, "$NetBSD: bktr_mem.c,v 1.4 2007/03/04 06:02:27 christos Exp $");
  53
  54 #include <sys/param.h>
  55 #include <sys/kernel.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <dev/bktr/bktr_mem.h>
  59
  60 struct memory_pointers {
  61         int         addresses_stored;
  62         vm_offset_t dma_prog;
  63         vm_offset_t odd_dma_prog;
  64         vm_offset_t vbidata;
  65         vm_offset_t vbibuffer;
  66         vm_offset_t buf;
  67 } memory_pointers;
  68
  69 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
  70
  71 /*************************************************************/
  72
  73 static int
  74 bktr_mem_modevent(module_t mod, int type, void *unused) {
  75
  76         switch (type) {
  77         case MOD_LOAD:
  78                 {
  79                 printf("bktr_mem: memory holder loaded\n");
  80 /*
  81  * bzero causes a panic.
  82                 memset((void *)memory_list, 0, sizeof(memory_list));
  83  * So use a simple for loop for now.
  84 */
  85                 {int x;
  86                  unsigned char *d = (unsigned char *)memory_list;
  87                  for (x=0; x< sizeof(memory_list); x++) {
  88                   d[x]=0;
  89                  }
  90                 }
  91                 return 0;
  92                 }
  93         case MOD_UNLOAD:
  94                 {
  95                 printf("bktr_mem: memory holder cannot be unloaded\n");
  96                 return EBUSY;
  97                 }
  98         default:
  99                 break;
 100         }
 101         return 0;
 102 };
 103
 104 /*************************************************************/
 105
 106 int
 107 bktr_has_stored_addresses(int unit) {
 108
 109         if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
 110                 printf("bktr_mem: Unit number %d invalid\n",unit);
 111                 return 0;
 112         }
 113
 114         return memory_list[unit].addresses_stored;
 115 }
 116
 117 /*************************************************************/
 118
 119 void
 120 bktr_store_address(int unit, int type, vm_offset_t addr) {
 121
 122         if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
 123                 printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n"
 124                        ,unit,type,addr);
 125                 return;
 126         }
 127
 128         switch (type) {
 129                 case BKTR_MEM_DMA_PROG:     memory_list[unit].dma_prog = addr;
 130                                             memory_list[unit].addresses_stored = 1;
 131                                             break;
 132                 case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr;
 133                                             memory_list[unit].addresses_stored = 1;
 134                                             break;
 135                 case BKTR_MEM_VBIDATA:      memory_list[unit].vbidata = addr;
 136                                             memory_list[unit].addresses_stored = 1;
 137                                             break;
 138                 case BKTR_MEM_VBIBUFFER:    memory_list[unit].vbibuffer = addr;
 139                                             memory_list[unit].addresses_stored = 1;
 140                                             break;
 141                 case BKTR_MEM_BUF:          memory_list[unit].buf = addr;
 142                                             memory_list[unit].addresses_stored = 1;
 143                                             break;
 144                 default:                    printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn",
 145                                                    type,unit,addr);
 146                                             break;
 147         }
 148 }
 149
 150 /*************************************************************/
 151
 152 vm_offset_t
 153 bktr_retrieve_address(int unit, int type) {
 154
 155         if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
 156                 printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type);
 157                 return NULL;
 158         }
 159         switch (type) {
 160                 case BKTR_MEM_DMA_PROG:     return memory_list[unit].dma_prog;
 161                 case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog;
 162                 case BKTR_MEM_VBIDATA:      return memory_list[unit].vbidata;
 163                 case BKTR_MEM_VBIBUFFER:    return memory_list[unit].vbibuffer;
 164                 case BKTR_MEM_BUF:          return memory_list[unit].buf;
 165                 default:                    printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit);
 166                                             return NULL;
 167         }
 168 }
 169
 170 /*************************************************************/
 171
 172 static moduledata_t bktr_mem_mod = {
 173         "bktr_mem",
 174         bktr_mem_modevent,
 175         0
 176 };
 177 /* The load order is First and module type is Driver to make sure bktr_mem
 178    loads (and initialises) before bktr when both are loaded together */
 179 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
 180 MODULE_VERSION(bktr_mem, 1);