linux-kernel - [PATCH] Fix Dreamcast DMA

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Date:	Thu, 19 Jul 2007 19:56:14 +0100
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	Paul Mundt <lethal@...rs.sourceforge.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-sh <linuxsh-dev@...ts.sourceforge.net>
Subject: [PATCH] Fix Dreamcast DMA

Signed-off by: Adrian McMenamin <adrian@...en.demon.co.uk>

diff --git a/arch/sh/drivers/dma/dma-api.c
b/arch/sh/drivers/dma/dma-api.c
index cf8e119..0c9b3bc 100644
--- a/arch/sh/drivers/dma/dma-api.c
+++ b/arch/sh/drivers/dma/dma-api.c
@@ -31,8 +31,8 @@ struct dma_info *get_dma_info(unsigned int chan)
 	 * the channel is.
 	 */
 	list_for_each_entry(info, &registered_dmac_list, list) {
-		if ((chan <  info->first_channel_nr) ||
-		    (chan >= info->first_channel_nr + info->nr_channels))
+		if ((chan <  info->first_vchannel_nr) ||
+		    (chan >= info->first_vchannel_nr + info->nr_channels))
 			continue;
 
 		return info;
@@ -82,7 +82,7 @@ struct dma_channel *get_dma_channel(unsigned int chan)
 
 	for (i = 0; i < info->nr_channels; i++) {
 		channel = &info->channels[i];
-		if (channel->chan == chan)
+		if (channel->chan == (chan - info->first_vchannel_nr))
 			return channel;
 	}
 
@@ -183,6 +183,7 @@ int dmac_search_free_channel(const char *dev_id)
 			return result;
 
 		atomic_set(&channel->busy, 1);
+
 		return channel->chan;
 	}
 
@@ -194,7 +195,6 @@ int request_dma(unsigned int chan, const char
*dev_id)
 	struct dma_channel *channel = { 0 };
 	struct dma_info *info = get_dma_info(chan);
 	int result;
-
 	channel = get_dma_channel(chan);
 	if (atomic_xchg(&channel->busy, 1))
 		return -EBUSY;
@@ -369,6 +369,7 @@ int register_dmac(struct dma_info *info)
 	}
 
 	total_channels = get_nr_channels();
+	info->first_vchannel_nr = total_channels;
 	for (i = 0; i < info->nr_channels; i++) {
 		struct dma_channel *chan = &info->channels[i];
 
@@ -387,7 +388,7 @@ int register_dmac(struct dma_info *info)
 	}
 
 	list_add(&info->list, &registered_dmac_list);
-
+	
 	return 0;
 }
 EXPORT_SYMBOL(register_dmac);
diff --git a/include/asm-sh/dma.h b/include/asm-sh/dma.h
index 6034d4a..4c75b70 100644
--- a/include/asm-sh/dma.h
+++ b/include/asm-sh/dma.h
@@ -111,6 +111,7 @@ struct dma_info {
 
 	struct list_head list;
 	int first_channel_nr;
+	int first_vchannel_nr;
 };
 
 struct dma_chan_caps {

-
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