diff options
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index a1d4ca290862..b354dcbed55b 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) |