https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b953c0d234bc72e8489d3bf51a276c5c4ec85345 authored by Linus Torvalds on 22 June 2015, 05:05:43 UTC
Linux 4.1
Linux 4.1
Tip revision: b953c0d
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);
}
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);