On Mon, 2012-10-01 at 12:39 -0400, Matt Porter wrote:
> Anything you can show at this point? ;) I'd be happy to drop the
> half-hack
> for a real API. If not, I'm going to carry that to v2 atm.
This is what I had done sometime back. Feel free to update....
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 9c02a45..94ae006 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -86,11 +86,11 @@ enum dma_transaction_type {
* @DMA_DEV_TO_DEV: Slave mode & From Device to Device
*/
enum dma_transfer_direction {
- DMA_MEM_TO_MEM,
- DMA_MEM_TO_DEV,
- DMA_DEV_TO_MEM,
- DMA_DEV_TO_DEV,
- DMA_TRANS_NONE,
+ DMA_MEM_TO_MEM = 0x01,
+ DMA_MEM_TO_DEV = 0x02,
+ DMA_DEV_TO_MEM = 0x04,
+ DMA_DEV_TO_DEV = 0x08,
+ DMA_TRANS_NONE = 0x10,
};
/**
@@ -371,6 +371,41 @@ struct dma_slave_config {
unsigned int slave_id;
};
+enum dmaengine_apis {
+ DMAENGINE_MEMCPY = 0x0001,
+ DMAENGINE_XOR = 0x0002,
+ DMAENGINE_XOR_VAL = 0x0004,
+ DMAENGINE_PQ = 0x0008,
+ DMAENGINE_PQ_VAL = 0x0010,
+ DMAENGINE_MEMSET = 0x0020,
+ DMAENGINE_SLAVE = 0x0040,
+ DMAENGINE_CYCLIC = 0x0080,
+ DMAENGINE_INTERLEAVED = 0x0100,
+ DMAENGINE_SG = 0x0200,
+};
+
+/* struct dmaengine_chan_caps - expose capability of a channel
+ * Note: each channel can have same or different capabilities
+ *
+ * This primarily classifies capabilities into
+ * a) APIs/ops supported
+ * b) channel physical capabilities
+ *
+ * @ops: or'ed api capability
+ * @widths: channel widths supported
+ * @dirn: channel directions supported
+ * @bursts: bitmask of burst lengths supported
+ * @mux: configurable slave id or hard wired
+ * -1 for hard wired, otherwise valid positive slave id (including zero)
+ */
+struct dmaengine_chan_caps {
+ enum dmaengine_apis ops;
+ enum dma_slave_buswidth widths;
+ enum dma_transfer_direction dirn;
+ unsigned int dma_bursts;
+ int mux;
+};
+
static inline const char *dma_chan_name(struct dma_chan *chan)
{
return dev_name(&chan->dev->device);
@@ -534,6 +569,7 @@ struct dma_tx_state {
* struct with auxiliary transfer status information, otherwise the call
* will just return a simple status code
* @device_issue_pending: push pending transactions to hardware
+ * @device_channel_caps: return the capablities of channel
*/
struct dma_device {
@@ -602,6 +638,9 @@ struct dma_device {
dma_cookie_t cookie,
struct dma_tx_state *txstate);
void (*device_issue_pending)(struct dma_chan *chan);
+
+ struct dmaengine_chan_caps *(*device_channel_caps)(
+ struct dma_chan *chan);
};
static inline int dmaengine_device_control(struct dma_chan *chan,
--
~Vinod
--
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