Blackfin arch: add set_dma_curr_addr DMA API to support sound driver recording function

Signed-off-by: Roy Huang <roy.huang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

arch/blackfin/kernel/bfin_dma_5xx.c

@@ -345,6 +345,16 @@ void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg)
 }
 EXPORT_SYMBOL(set_dma_sg);
 
+void set_dma_curr_addr(unsigned int channel, unsigned long addr)
+{
+	BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
+	       && channel < MAX_BLACKFIN_DMA_CHANNEL));
+
+	dma_ch[channel].regs->curr_addr_ptr = addr;
+	SSYNC();
+}
+EXPORT_SYMBOL(set_dma_curr_addr);
+
 /*------------------------------------------------------------------------------
  *	Get the DMA status of a specific DMA channel from the system.
  *-----------------------------------------------------------------------------*/

include/asm-blackfin/dma.h

@@ -159,6 +159,7 @@ void set_dma_y_modify(unsigned int channel, short y_modify);
 void set_dma_config(unsigned int channel, unsigned short config);
 unsigned short set_bfin_dma_config(char direction, char flow_mode,
 				   char intr_mode, char dma_mode, char width);
+void set_dma_curr_addr(unsigned int channel, unsigned long addr);
 
 /* get curr status for polling */
 unsigned short get_dma_curr_irqstat(unsigned int channel);