ARM: SAMSUNG: Move DMA support to plat-samsung

Move the core of the DMA support to plat-samsung for everyone to use.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/arch/arm/plat-samsung/dma.c b/arch/arm/plat-samsung/dma.c
new file mode 100644
index 000000000000..606db1af5fe7
--- /dev/null
+++ b/arch/arm/plat-samsung/dma.c
@@ -0,0 +1,84 @@
+/* linux/arch/arm/plat-s3c/dma.c
+ *
+ * Copyright (c) 2003-2009 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C DMA core
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+struct s3c2410_dma_buf;
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+
+#include <mach/dma.h>
+#include <mach/irqs.h>
+
+/* dma channel state information */
+struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS];
+struct s3c2410_dma_chan *s3c_dma_chan_map[DMACH_MAX];
+
+/* s3c_dma_lookup_channel
+ *
+ * change the dma channel number given into a real dma channel id
+*/
+
+struct s3c2410_dma_chan *s3c_dma_lookup_channel(unsigned int channel)
+{
+        if (channel & DMACH_LOW_LEVEL)
+                return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL];
+        else
+                return s3c_dma_chan_map[channel];
+}
+
+/* do we need to protect the settings of the fields from
+ * irq?
+*/
+
+int s3c2410_dma_set_opfn(unsigned int channel, s3c2410_dma_opfn_t rtn)
+{
+        struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
+
+        if (chan == NULL)
+                return -EINVAL;
+
+        pr_debug("%s: chan=%p, op rtn=%p\n", __func__, chan, rtn);
+
+        chan->op_fn = rtn;
+
+        return 0;
+}
+EXPORT_SYMBOL(s3c2410_dma_set_opfn);
+
+int s3c2410_dma_set_buffdone_fn(unsigned int channel, s3c2410_dma_cbfn_t rtn)
+{
+        struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
+
+        if (chan == NULL)
+                return -EINVAL;
+
+        pr_debug("%s: chan=%p, callback rtn=%p\n", __func__, chan, rtn);
+
+        chan->callback_fn = rtn;
+
+        return 0;
+}
+EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
+
+int s3c2410_dma_setflags(unsigned int channel, unsigned int flags)
+{
+        struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
+
+        if (chan == NULL)
+                return -EINVAL;
+
+        chan->flags = flags;
+        return 0;
+}
+EXPORT_SYMBOL(s3c2410_dma_setflags);