kernel/sound/isa/gus/gus_dram.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *  DRAM access routines
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/time.h>
  23 #include <sound/core.h>
  24 #include <sound/gus.h>
  25 #include <sound/info.h>
  26
  27
  28 static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
  29                              unsigned int address, unsigned int size)
  30 {
  31         unsigned long flags;
  32         unsigned int size1, size2;
  33         char buffer[256], *pbuffer;
  34
  35         while (size > 0) {
  36                 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
  37                 if (copy_from_user(buffer, _buffer, size1))
  38                         return -EFAULT;
  39                 if (gus->interwave) {
  40                         spin_lock_irqsave(&gus->reg_lock, flags);
  41                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
  42                         snd_gf1_dram_addr(gus, address);
  43                         outsb(GUSP(gus, DRAM), buffer, size1);
  44                         spin_unlock_irqrestore(&gus->reg_lock, flags);
  45                         address += size1;
  46                 } else {
  47                         pbuffer = buffer;
  48                         size2 = size1;
  49                         while (size2--)
  50                                 snd_gf1_poke(gus, address++, *pbuffer++);
  51                 }
  52                 size -= size1;
  53                 _buffer += size1;
  54         }
  55         return 0;
  56 }
  57
  58
  59 int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
  60                        unsigned int address, unsigned int size)
  61 {
  62         return snd_gus_dram_poke(gus, buffer, address, size);
  63 }
  64
  65 static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
  66                              unsigned int address, unsigned int size,
  67                              int rom)
  68 {
  69         unsigned long flags;
  70         unsigned int size1, size2;
  71         char buffer[256], *pbuffer;
  72
  73         while (size > 0) {
  74                 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
  75                 if (gus->interwave) {
  76                         spin_lock_irqsave(&gus->reg_lock, flags);
  77                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
  78                         snd_gf1_dram_addr(gus, address);
  79                         insb(GUSP(gus, DRAM), buffer, size1);
  80                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
  81                         spin_unlock_irqrestore(&gus->reg_lock, flags);
  82                         address += size1;
  83                 } else {
  84                         pbuffer = buffer;
  85                         size2 = size1;
  86                         while (size2--)
  87                                 *pbuffer++ = snd_gf1_peek(gus, address++);
  88                 }
  89                 if (copy_to_user(_buffer, buffer, size1))
  90                         return -EFAULT;
  91                 size -= size1;
  92                 _buffer += size1;
  93         }
  94         return 0;
  95 }
  96
  97 int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
  98                       unsigned int address, unsigned int size,
  99                       int rom)
 100 {
 101         return snd_gus_dram_peek(gus, buffer, address, size, rom);
 102 }