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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
* DRAM access routines
*/
#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);
}
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