dmaengine: dw-axi-dmac: Add device_config operation

Add device_config() callback function so that the device address
can be passed to the dma driver.

DMA clients use this interface to pass in the device address to the
AxiDMA. Without this interface, data transfer between device to memory
and memory to device would failed.
Signed-off-by: Sia Jee Heng <jee.heng.sia@intel.com>
Tested-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Link: https://lore.kernel.org/r/20210125013255.25799-6-jee.heng.sia@intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -559,6 +559,16 @@ dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
 	return NULL;
 }
 
+static int dw_axi_dma_chan_slave_config(struct dma_chan *dchan,
+					struct dma_slave_config *config)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	memcpy(&chan->config, config, sizeof(*config));
+
+	return 0;
+}
+
 static void axi_chan_dump_lli(struct axi_dma_chan *chan,
 			      struct axi_dma_hw_desc *desc)
 {
@@ -948,6 +958,7 @@ static int dw_probe(struct platform_device *pdev)
 
 	dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
 	dw->dma.device_synchronize = dw_axi_dma_synchronize;
+	dw->dma.device_config = dw_axi_dma_chan_slave_config;
 
 	platform_set_drvdata(pdev, chip);
 

drivers/dma/dw-axi-dmac/dw-axi-dmac.h

@@ -43,6 +43,7 @@ struct axi_dma_chan {
 	struct virt_dma_chan		vc;
 
 	struct axi_dma_desc		*desc;
+	struct dma_slave_config		config;
 	/* these other elements are all protected by vc.lock */
 	bool				is_paused;
 };