sound/isa/gus/gus_dram.c

   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
  13 static 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
  44 int 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
  50 static 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
  82 int 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 }