LXR linux/sound/isa/gus/gus

   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
  28static 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
  59int 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
  65static 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
  97int 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}
 103