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-rw-r--r--include/linux/spi/spi.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index a1d4ca2..b354dcb 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -25,6 +25,8 @@
#include <linux/kthread.h>
#include <linux/completion.h>
+struct dma_chan;
+
/*
* INTERFACES between SPI master-side drivers and SPI infrastructure.
* (There's no SPI slave support for Linux yet...)
@@ -387,6 +389,17 @@ struct spi_master {
void (*cleanup)(struct spi_device *spi);
/*
+ * Used to enable core support for DMA handling, if can_dma()
+ * exists and returns true then the transfer will be mapped
+ * prior to transfer_one() being called. The driver should
+ * not modify or store xfer and dma_tx and dma_rx must be set
+ * while the device is prepared.
+ */
+ bool (*can_dma)(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer);
+
+ /*
* These hooks are for drivers that want to use the generic
* master transfer queueing mechanism. If these are used, the
* transfer() function above must NOT be specified by the driver.
@@ -404,6 +417,7 @@ struct spi_master {
bool rt;
bool auto_runtime_pm;
bool cur_msg_prepared;
+ bool cur_msg_mapped;
struct completion xfer_completion;
int (*prepare_transfer_hardware)(struct spi_master *master);
@@ -425,6 +439,10 @@ struct spi_master {
/* gpio chip select */
int *cs_gpios;
+
+ /* DMA channels for use with core dmaengine helpers */
+ struct dma_chan *dma_tx;
+ struct dma_chan *dma_rx;
};
static inline void *spi_master_get_devdata(struct spi_master *master)
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