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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (c) by Jaroslav Kysela <[email protected]>
- * 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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