[ARM PATCH] 2408/1: S3C2410 - dma get position call

Patch from Ben Dooks

Add call to find out the current source and destination
of the given dma channel

Signed-off-by: Ben Dooks
Signed-off-by: Russell King

arch/arm/mach-s3c2410/dma.c

@@ -1063,6 +1063,29 @@ int s3c2410_dma_devconfig(int channel,
 
 EXPORT_SYMBOL(s3c2410_dma_devconfig);
 
+/* s3c2410_dma_getposition
+ *
+ * returns the current transfer points for the dma source and destination
+*/
+
+int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
+{
+ 	s3c2410_dma_chan_t *chan = &s3c2410_chans[channel];
+
+ 	check_channel(channel);
+
+	if (src != NULL)
+ 		*src = dma_rdreg(chan, S3C2410_DMA_DCSRC);
+
+ 	if (dst != NULL)
+ 		*dst = dma_rdreg(chan, S3C2410_DMA_DCDST);
+
+ 	return 0;
+}
+
+EXPORT_SYMBOL(s3c2410_dma_getposition);
+
+
 /* system device class */
 
 #ifdef CONFIG_PM

include/asm-arm/arch-s3c2410/dma.h

@@ -285,6 +285,14 @@ extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
 extern int s3c2410_dma_devconfig(int channel, s3c2410_dmasrc_t source,
 				 int hwcfg, unsigned long devaddr);
 
+/* s3c2410_dma_getposition
+ *
+ * get the position that the dma transfer is currently at
+*/
+
+extern int s3c2410_dma_getposition(dmach_t channel,
+				   dma_addr_t *src, dma_addr_t *dest);
+
 extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
 extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);