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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/isa/gus/gus_dram.c
10817 views
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/*

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 *  Copyright (c) by Jaroslav Kysela <[email protected]>

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 *  DRAM access routines

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 *

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 *

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 *   This program is free software; you can redistribute it and/or modify

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 *   it under the terms of the GNU General Public License as published by

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 *   the Free Software Foundation; either version 2 of the License, or

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 *   (at your option) any later version.

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 *

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 *   This program is distributed in the hope that it will be useful,

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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *   GNU General Public License for more details.

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 *

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 *   You should have received a copy of the GNU General Public License

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 *   along with this program; if not, write to the Free Software

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 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

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 *

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 */

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#include <linux/time.h>

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#include <sound/core.h>

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#include <sound/gus.h>

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#include <sound/info.h>

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static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,

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			     unsigned int address, unsigned int size)

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{

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	unsigned long flags;

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	unsigned int size1, size2;

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	char buffer[256], *pbuffer;

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	while (size > 0) {

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		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;

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		if (copy_from_user(buffer, _buffer, size1))

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			return -EFAULT;

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		if (gus->interwave) {

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			spin_lock_irqsave(&gus->reg_lock, flags);

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			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);

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			snd_gf1_dram_addr(gus, address);

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			outsb(GUSP(gus, DRAM), buffer, size1);

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			spin_unlock_irqrestore(&gus->reg_lock, flags);

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			address += size1;

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		} else {

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			pbuffer = buffer;

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			size2 = size1;

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			while (size2--)

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				snd_gf1_poke(gus, address++, *pbuffer++);

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		}

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		size -= size1;

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		_buffer += size1;

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	}

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	return 0;

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}

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int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,

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		       unsigned int address, unsigned int size)

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{

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	return snd_gus_dram_poke(gus, buffer, address, size);

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}

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static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,

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			     unsigned int address, unsigned int size,

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			     int rom)

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{

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	unsigned long flags;

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	unsigned int size1, size2;

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	char buffer[256], *pbuffer;

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	while (size > 0) {

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		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;

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		if (gus->interwave) {

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			spin_lock_irqsave(&gus->reg_lock, flags);

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			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);

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			snd_gf1_dram_addr(gus, address);

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			insb(GUSP(gus, DRAM), buffer, size1);

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			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);

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			spin_unlock_irqrestore(&gus->reg_lock, flags);

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			address += size1;

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		} else {

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			pbuffer = buffer;

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			size2 = size1;

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			while (size2--)

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				*pbuffer++ = snd_gf1_peek(gus, address++);

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		}

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		if (copy_to_user(_buffer, buffer, size1))

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			return -EFAULT;

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		size -= size1;

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		_buffer += size1;

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	}

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	return 0;

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}

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int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,

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		      unsigned int address, unsigned int size,

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		      int rom)

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{

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	return snd_gus_dram_peek(gus, buffer, address, size, rom);

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}

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