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87 lines
2.2 KiB
87 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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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#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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