bktr_mem.c

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    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);

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FreeBSD/Linux Kernel Cross Reference sys/dev/video/bktr/bktr_mem.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/video/bktr/bktr_mem.c