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Commit e193ba29 authored by Russell King's avatar Russell King
Browse files

ARM: dma: add /proc/dma support to arch/arm/kernel/dma.c 



We have our own private implementation for ISA-like DMA which has been
missing exposure via the /proc/dma interface.  Add support for this.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f76348a3

arch/arm/kernel/dma.c

+36 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
#include <linux/spinlock.h>

#include <linux/errno.h>

#include <linux/scatterlist.h>

#include <linux/seq_file.h>

#include <linux/proc_fs.h>



#include <asm/dma.h>
@@ -264,3 +266,37 @@ int get_dma_residue(unsigned int chan) 
	return ret;

}

EXPORT_SYMBOL(get_dma_residue);



#ifdef CONFIG_PROC_FS

static int proc_dma_show(struct seq_file *m, void *v)

{

	int i;



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

		dma_t *dma = dma_channel(i);

		if (dma && dma->lock)

			seq_printf(m, "%2d: %s\n", i, dma->device_id);

	}

	return 0;

}



static int proc_dma_open(struct inode *inode, struct file *file)

{

	return single_open(file, proc_dma_show, NULL);

}



static const struct file_operations proc_dma_operations = {

	.open		= proc_dma_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init proc_dma_init(void)

{

	proc_create("dma", 0, NULL, &proc_dma_operations);

	return 0;

}



__initcall(proc_dma_init);

#endif