mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-30 06:53:27 +00:00
b52af40923
In i8237A_resume(), when resetting the DMA controller, the parameters to dma_outb() were mixed up. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> [ cleaned up the file a tiny bit. ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
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/sysdev.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 int i8237A_resume(struct sys_device *dev)
|
|
{
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i8237A_suspend(struct sys_device *dev, pm_message_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_class i8237_sysdev_class = {
|
|
.name = "i8237",
|
|
.suspend = i8237A_suspend,
|
|
.resume = i8237A_resume,
|
|
};
|
|
|
|
static struct sys_device device_i8237A = {
|
|
.id = 0,
|
|
.cls = &i8237_sysdev_class,
|
|
};
|
|
|
|
static int __init i8237A_init_sysfs(void)
|
|
{
|
|
int error = sysdev_class_register(&i8237_sysdev_class);
|
|
if (!error)
|
|
error = sysdev_register(&device_i8237A);
|
|
return error;
|
|
}
|
|
device_initcall(i8237A_init_sysfs);
|