Release 4.14 arch/x86/kernel/i8237.c

/*
 * 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);
}

Contributors
Person
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Commits
CommitProp
Pierre Ossman
69
92.00%
1
33.33%
Clemens Ladisch
4
5.33%
1
33.33%
Rafael J. Wysocki
2
2.67%
1
33.33%
Total
75
100.00%
3
100.00%


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;
}
Contributors
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Commits
CommitProp
Pierre Ossman
14
77.78%
1
50.00%
Rafael J. Wysocki
4
22.22%
1
50.00%
Total
18
100.00%
2
100.00%


device_initcall(i8237A_init_ops);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Pierre Ossman
105
86.78%
1
20.00%
Rafael J. Wysocki
10
8.26%
1
20.00%
Clemens Ladisch
4
3.31%
1
20.00%
Kay Sievers
1
0.83%
1
20.00%
Dave Jones
1
0.83%
1
20.00%
Total
121
100.00%
5
100.00%
Directory: arch/x86/kernel

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