es1888.c 1.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * linux/arch/alpha/kernel/es1888.c
  4. *
  5. * Init the built-in ES1888 sound chip (SB16 compatible)
  6. */
  7. #include <linux/init.h>
  8. #include <asm/io.h>
  9. #include "proto.h"
  10. void __init
  11. es1888_init(void)
  12. {
  13. /* Sequence of IO reads to init the audio controller */
  14. inb(0x0229);
  15. inb(0x0229);
  16. inb(0x0229);
  17. inb(0x022b);
  18. inb(0x0229);
  19. inb(0x022b);
  20. inb(0x0229);
  21. inb(0x0229);
  22. inb(0x022b);
  23. inb(0x0229);
  24. inb(0x0220); /* This sets the base address to 0x220 */
  25. /* Sequence to set DMA channels */
  26. outb(0x01, 0x0226); /* reset */
  27. inb(0x0226); /* pause */
  28. outb(0x00, 0x0226); /* release reset */
  29. while (!(inb(0x022e) & 0x80)) /* wait for bit 7 to assert*/
  30. continue;
  31. inb(0x022a); /* pause */
  32. outb(0xc6, 0x022c); /* enable extended mode */
  33. inb(0x022a); /* pause, also forces the write */
  34. while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
  35. continue;
  36. outb(0xb1, 0x022c); /* setup for write to Interrupt CR */
  37. while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
  38. continue;
  39. outb(0x14, 0x022c); /* set IRQ 5 */
  40. while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
  41. continue;
  42. outb(0xb2, 0x022c); /* setup for write to DMA CR */
  43. while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
  44. continue;
  45. outb(0x18, 0x022c); /* set DMA channel 1 */
  46. inb(0x022c); /* force the write */
  47. }