88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* DRAM access routines
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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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