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[PATCH] sh: DMA updates

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This extends the current SH DMA API somewhat to support a proper virtual
channel abstraction, and also works to represent this through the driver model
by giving each DMAC its own platform device.

There's also a few other minor changes to support a few new CPU subtypes, and
make TEI generation for the SH DMAC configurable.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Mundt
2006-01-16 22:14:09 -08:00
committed by Linus Torvalds
parent 0025835cf2
commit 0d831770b1
13 changed files with 293 additions and 122 deletions
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51
arch/sh/drivers/dma/dma-api.c
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@@ -3,7 +3,7 @@
*
* SuperH-specific DMA management API
*
* Copyright (C) 2003, 2004 Paul Mundt
* Copyright (C) 2003, 2004, 2005 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -15,6 +15,7 @@
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <asm/dma.h>
DEFINE_SPINLOCK(dma_spin_lock);
@@ -55,16 +56,14 @@ static LIST_HEAD(registered_dmac_list);
struct dma_info *get_dma_info(unsigned int chan)
{
struct list_head *pos, *tmp;
struct dma_info *info;
unsigned int total = 0;
/*
* Look for each DMAC's range to determine who the owner of
* the channel is.
*/
list_for_each_safe(pos, tmp, &registered_dmac_list) {
struct dma_info *info = list_entry(pos, struct dma_info, list);
list_for_each_entry(info, &registered_dmac_list, list) {
total += info->nr_channels;
if (chan > total)
continue;
@@ -75,6 +74,20 @@ struct dma_info *get_dma_info(unsigned int chan)
return NULL;
}
static unsigned int get_nr_channels(void)
{
struct dma_info *info;
unsigned int nr = 0;
if (unlikely(list_empty(&registered_dmac_list)))
return nr;
list_for_each_entry(info, &registered_dmac_list, list)
nr += info->nr_channels;
return nr;
}
struct dma_channel *get_dma_channel(unsigned int chan)
{
struct dma_info *info = get_dma_info(chan);
@@ -173,7 +186,7 @@ int dma_xfer(unsigned int chan, unsigned long from,
static int dma_read_proc(char *buf, char **start, off_t off,
int len, int *eof, void *data)
{
struct list_head *pos, *tmp;
struct dma_info *info;
char *p = buf;
if (list_empty(&registered_dmac_list))
@@ -182,8 +195,7 @@ static int dma_read_proc(char *buf, char **start, off_t off,
/*
* Iterate over each registered DMAC
*/
list_for_each_safe(pos, tmp, &registered_dmac_list) {
struct dma_info *info = list_entry(pos, struct dma_info, list);
list_for_each_entry(info, &registered_dmac_list, list) {
int i;
/*
@@ -205,9 +217,9 @@ static int dma_read_proc(char *buf, char **start, off_t off,
#endif
int __init register_dmac(struct dma_info *info)
int register_dmac(struct dma_info *info)
{
int i;
unsigned int total_channels, i;
INIT_LIST_HEAD(&info->list);
@@ -217,6 +229,11 @@ int __init register_dmac(struct dma_info *info)
BUG_ON((info->flags & DMAC_CHANNELS_CONFIGURED) && !info->channels);
info->pdev = platform_device_register_simple((char *)info->name, -1,
NULL, 0);
if (IS_ERR(info->pdev))
return PTR_ERR(info->pdev);
/*
* Don't touch pre-configured channels
*/
@@ -232,10 +249,12 @@ int __init register_dmac(struct dma_info *info)
memset(info->channels, 0, size);
}
total_channels = get_nr_channels();
for (i = 0; i < info->nr_channels; i++) {
struct dma_channel *chan = info->channels + i;
chan->chan = i;
chan->vchan = i + total_channels;
memcpy(chan->dev_id, "Unused", 7);
@@ -245,9 +264,7 @@ int __init register_dmac(struct dma_info *info)
init_MUTEX(&chan->sem);
init_waitqueue_head(&chan->wait_queue);
#ifdef CONFIG_SYSFS
dma_create_sysfs_files(chan);
#endif
dma_create_sysfs_files(chan, info);
}
list_add(&info->list, &registered_dmac_list);
@@ -255,12 +272,18 @@ int __init register_dmac(struct dma_info *info)
return 0;
}
void __exit unregister_dmac(struct dma_info *info)
void unregister_dmac(struct dma_info *info)
{
unsigned int i;
for (i = 0; i < info->nr_channels; i++)
dma_remove_sysfs_files(info->channels + i, info);
if (!(info->flags & DMAC_CHANNELS_CONFIGURED))
kfree(info->channels);
list_del(&info->list);
platform_device_unregister(info->pdev);
}
static int __init dma_api_init(void)