dmaengine: Create a generic dma_slave_caps callback

dma_slave_caps is very important to the generic layers that might interact with
dmaengine, such as ASoC. Unfortunately, it has been added as yet another
dma_device callback, and most of the existing drivers haven't implemented it,
reducing its reliability.

Introduce a generic behaviour to implement this, that rely on both the split of
device_control to derive which functions are supported and on new variables to
be set in the dma_device structure.

These variables holds what used to be the capabilities, that were set
per-channel. However, this proved to be a bit overkill, since every driver
filling these so far were hardcoding it, disregarding which channel was
actually given.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 37 insertions, 4 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index ded5161653aa..adf22089cc93 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -594,6 +594,14 @@ struct dma_tx_state {
  * @fill_align: alignment shift for memset operations
  * @dev_id: unique device ID
  * @dev: struct device reference for dma mapping api
+ * @src_addr_widths: bit mask of src addr widths the device supports
+ * @dst_addr_widths: bit mask of dst addr widths the device supports
+ * @directions: bit mask of slave direction the device supports since
+ *      the enum dma_transfer_direction is not defined as bits for
+ *      each type of direction, the dma controller should fill (1 <<
+ *      <TYPE>) and same should be checked by controller as well
+ * @residue_granularity: granularity of the transfer residue reported
+ *      by tx_status
  * @device_alloc_chan_resources: allocate resources and return the
  *      number of allocated descriptors
  * @device_free_chan_resources: release DMA channel's resources
@@ -643,6 +651,11 @@ struct dma_device {
         int dev_id;
         struct device *dev;
 
+        u32 src_addr_widths;
+        u32 dst_addr_widths;
+        u32 directions;
+        enum dma_residue_granularity residue_granularity;
+
         int (*device_alloc_chan_resources)(struct dma_chan *chan);
         void (*device_free_chan_resources)(struct dma_chan *chan);
 
@@ -784,17 +797,37 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_sg(
 
 static inline 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, chan->device->cap_mask.bits))
+        if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
+                return -ENXIO;
+
+        if (device->device_slave_caps)
+                return device->device_slave_caps(chan, caps);
+
+        /*
+         * 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;
 
-        if (chan->device->device_slave_caps)
-                return chan->device->device_slave_caps(chan, caps);
+        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 -ENXIO;
+        return 0;
 }
 
 static inline int dmaengine_terminate_all(struct dma_chan *chan)