LXR linux/sound/isa/gus/gus

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *  DRAM access routines
   5 */
   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