root/sound/isa/gus/gus_dram.c

DEFINITIONS

1. snd_gus_dram_poke
2. snd_gus_dram_write
3. snd_gus_dram_peek
4. snd_gus_dram_read

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  DRAM access routines
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/info.h>


static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
                             unsigned int address, unsigned int size)
{
        unsigned long flags;
        unsigned int size1, size2;
        char buffer[256], *pbuffer;

        while (size > 0) {
                size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
                if (copy_from_user(buffer, _buffer, size1))
                        return -EFAULT;
                if (gus->interwave) {
                        spin_lock_irqsave(&gus->reg_lock, flags);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
                        snd_gf1_dram_addr(gus, address);
                        outsb(GUSP(gus, DRAM), buffer, size1);
                        spin_unlock_irqrestore(&gus->reg_lock, flags);
                        address += size1;
                } else {
                        pbuffer = buffer;
                        size2 = size1;
                        while (size2--)
                                snd_gf1_poke(gus, address++, *pbuffer++);
                }
                size -= size1;
                _buffer += size1;
        }
        return 0;
}


int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
                       unsigned int address, unsigned int size)
{
        return snd_gus_dram_poke(gus, buffer, address, size);
}

static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
                             unsigned int address, unsigned int size,
                             int rom)
{
        unsigned long flags;
        unsigned int size1, size2;
        char buffer[256], *pbuffer;

        while (size > 0) {
                size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
                if (gus->interwave) {
                        spin_lock_irqsave(&gus->reg_lock, flags);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
                        snd_gf1_dram_addr(gus, address);
                        insb(GUSP(gus, DRAM), buffer, size1);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
                        spin_unlock_irqrestore(&gus->reg_lock, flags);
                        address += size1;
                } else {
                        pbuffer = buffer;
                        size2 = size1;
                        while (size2--)
                                *pbuffer++ = snd_gf1_peek(gus, address++);
                }
                if (copy_to_user(_buffer, buffer, size1))
                        return -EFAULT;
                size -= size1;
                _buffer += size1;
        }
        return 0;
}

int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
                      unsigned int address, unsigned int size,
                      int rom)
{
        return snd_gus_dram_peek(gus, buffer, address, size, rom);
}