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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>4 * DRAM access routines5 */6 7#include <linux/time.h>8#include <sound/core.h>9#include <sound/gus.h>10#include <sound/info.h>11 12 13static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,14 unsigned int address, unsigned int size)15{16 unsigned long flags;17 unsigned int size1, size2;18 char buffer[256], *pbuffer;19 20 while (size > 0) {21 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;22 if (copy_from_user(buffer, _buffer, size1))23 return -EFAULT;24 if (gus->interwave) {25 spin_lock_irqsave(&gus->reg_lock, flags);26 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);27 snd_gf1_dram_addr(gus, address);28 outsb(GUSP(gus, DRAM), buffer, size1);29 spin_unlock_irqrestore(&gus->reg_lock, flags);30 address += size1;31 } else {32 pbuffer = buffer;33 size2 = size1;34 while (size2--)35 snd_gf1_poke(gus, address++, *pbuffer++);36 }37 size -= size1;38 _buffer += size1;39 }40 return 0;41}42 43 44int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,45 unsigned int address, unsigned int size)46{47 return snd_gus_dram_poke(gus, buffer, address, size);48}49 50static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,51 unsigned int address, unsigned int size,52 int rom)53{54 unsigned long flags;55 unsigned int size1, size2;56 char buffer[256], *pbuffer;57 58 while (size > 0) {59 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;60 if (gus->interwave) {61 spin_lock_irqsave(&gus->reg_lock, flags);62 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);63 snd_gf1_dram_addr(gus, address);64 insb(GUSP(gus, DRAM), buffer, size1);65 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);66 spin_unlock_irqrestore(&gus->reg_lock, flags);67 address += size1;68 } else {69 pbuffer = buffer;70 size2 = size1;71 while (size2--)72 *pbuffer++ = snd_gf1_peek(gus, address++);73 }74 if (copy_to_user(_buffer, buffer, size1))75 return -EFAULT;76 size -= size1;77 _buffer += size1;78 }79 return 0;80}81 82int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,83 unsigned int address, unsigned int size,84 int rom)85{86 return snd_gus_dram_peek(gus, buffer, address, size, rom);87}88