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Subject[PATCH] Fix DMA on Dreamcast
I think my first attempt to post this may have got lost in space somewhere.

Signed-off by: Adrian McMenamin <adrian@mcmen.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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