gus_dram.c 2.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) by Jaroslav Kysela <[email protected]>
  4. * DRAM access routines
  5. */
  6. #include <linux/time.h>
  7. #include <sound/core.h>
  8. #include <sound/gus.h>
  9. #include <sound/info.h>
  10. static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
  11. unsigned int address, unsigned int size)
  12. {
  13. unsigned long flags;
  14. unsigned int size1, size2;
  15. char buffer[256], *pbuffer;
  16. while (size > 0) {
  17. size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
  18. if (copy_from_user(buffer, _buffer, size1))
  19. return -EFAULT;
  20. if (gus->interwave) {
  21. spin_lock_irqsave(&gus->reg_lock, flags);
  22. snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
  23. snd_gf1_dram_addr(gus, address);
  24. outsb(GUSP(gus, DRAM), buffer, size1);
  25. spin_unlock_irqrestore(&gus->reg_lock, flags);
  26. address += size1;
  27. } else {
  28. pbuffer = buffer;
  29. size2 = size1;
  30. while (size2--)
  31. snd_gf1_poke(gus, address++, *pbuffer++);
  32. }
  33. size -= size1;
  34. _buffer += size1;
  35. }
  36. return 0;
  37. }
  38. int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
  39. unsigned int address, unsigned int size)
  40. {
  41. return snd_gus_dram_poke(gus, buffer, address, size);
  42. }
  43. static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
  44. unsigned int address, unsigned int size,
  45. int rom)
  46. {
  47. unsigned long flags;
  48. unsigned int size1, size2;
  49. char buffer[256], *pbuffer;
  50. while (size > 0) {
  51. size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
  52. if (gus->interwave) {
  53. spin_lock_irqsave(&gus->reg_lock, flags);
  54. snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
  55. snd_gf1_dram_addr(gus, address);
  56. insb(GUSP(gus, DRAM), buffer, size1);
  57. snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
  58. spin_unlock_irqrestore(&gus->reg_lock, flags);
  59. address += size1;
  60. } else {
  61. pbuffer = buffer;
  62. size2 = size1;
  63. while (size2--)
  64. *pbuffer++ = snd_gf1_peek(gus, address++);
  65. }
  66. if (copy_to_user(_buffer, buffer, size1))
  67. return -EFAULT;
  68. size -= size1;
  69. _buffer += size1;
  70. }
  71. return 0;
  72. }
  73. int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
  74. unsigned int address, unsigned int size,
  75. int rom)
  76. {
  77. return snd_gus_dram_peek(gus, buffer, address, size, rom);
  78. }