/*

   * 8237A DMA controller suspend functions.

   *
   * Written by Pierre Ossman, 2005.

   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or (at
   * your option) any later version.

   */
  
  #include <linux/init.h>

  #include <linux/syscore_ops.h>

  
  #include <asm/dma.h>
  
  /*
   * This module just handles suspend/resume issues with the
   * 8237A DMA controller (used for ISA and LPC).
   * Allocation is handled in kernel/dma.c and normal usage is
   * in asm/dma.h.
   */

  static void i8237A_resume(void)

  {
  	unsigned long flags;
  	int i;
  
  	flags = claim_dma_lock();

  	dma_outb(0, DMA1_RESET_REG);
  	dma_outb(0, DMA2_RESET_REG);

  	for (i = 0; i < 8; i++) {

  		set_dma_addr(i, 0x000000);
  		/* DMA count is a bit weird so this is not 0 */
  		set_dma_count(i, 1);
  	}
  
  	/* Enable cascade DMA or channel 0-3 won't work */
  	enable_dma(4);
  
  	release_dma_lock(flags);

  }

  static struct syscore_ops i8237_syscore_ops = {

  	.resume		= i8237A_resume,

  };

  static int __init i8237A_init_ops(void)

  {

  	register_syscore_ops(&i8237_syscore_ops);
  	return 0;

  }

  device_initcall(i8237A_init_ops);