dmaengine: Move dma_get_slave_caps() implementation to dmaengine.c

[firefly-linux-kernel-4.4.55.git] / drivers / dma / dmaengine.c

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 30211f9791b771560e82f7ca807df34b3902f09c..f15712f2fec6c06949c23f845eeb8bbb776b8907 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -479,6 +479,39 @@ static void dma_channel_rebalance(void)
                }
 }
 
+int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
+{
+       struct dma_device *device;
+
+       if (!chan || !caps)
+               return -EINVAL;
+
+       device = chan->device;
+
+       /* check if the channel supports slave transactions */
+       if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
+               return -ENXIO;
+
+       /*
+        * Check whether it reports it uses the generic slave
+        * capabilities, if not, that means it doesn't support any
+        * kind of slave capabilities reporting.
+        */
+       if (!device->directions)
+               return -ENXIO;
+
+       caps->src_addr_widths = device->src_addr_widths;
+       caps->dst_addr_widths = device->dst_addr_widths;
+       caps->directions = device->directions;
+       caps->residue_granularity = device->residue_granularity;
+
+       caps->cmd_pause = !!device->device_pause;
+       caps->cmd_terminate = !!device->device_terminate_all;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(dma_get_slave_caps);
+
 static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
                                          struct dma_device *dev,
                                          dma_filter_fn fn, void *fn_param)