diff options
Diffstat (limited to 'drivers/spi/spi-pxa2xx.h')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.h | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h index 0a98905c916e..97ff4717e6ac 100644 --- a/drivers/spi/spi-pxa2xx.h +++ b/drivers/spi/spi-pxa2xx.h @@ -10,11 +10,15 @@ #ifndef SPI_PXA2XX_H #define SPI_PXA2XX_H +#include <linux/atomic.h> +#include <linux/dmaengine.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/pxa2xx_ssp.h> +#include <linux/scatterlist.h> +#include <linux/sizes.h> #include <linux/spi/spi.h> #include <linux/spi/pxa2xx_spi.h> @@ -53,6 +57,16 @@ struct driver_data { /* Message Transfer pump */ struct tasklet_struct pump_transfers; + /* DMA engine support */ + struct dma_chan *rx_chan; + struct dma_chan *tx_chan; + struct sg_table rx_sgt; + struct sg_table tx_sgt; + int rx_nents; + int tx_nents; + void *dummy; + atomic_t dma_running; + /* Current message transfer state info */ struct spi_message *cur_msg; struct spi_transfer *cur_transfer; @@ -116,7 +130,6 @@ DEFINE_SSP_REG(SSPSP, 0x2c) #define DONE_STATE ((void *)2) #define ERROR_STATE ((void *)-1) -#define MAX_DMA_LEN 8191 #define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT) #define DMA_ALIGNMENT 8 @@ -142,7 +155,24 @@ static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val) extern int pxa2xx_spi_flush(struct driver_data *drv_data); extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data); +/* + * Select the right DMA implementation. + */ #if defined(CONFIG_SPI_PXA2XX_PXADMA) +#define SPI_PXA2XX_USE_DMA 1 +#define MAX_DMA_LEN 8191 +#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE) +#elif defined(CONFIG_SPI_PXA2XX_DMA) +#define SPI_PXA2XX_USE_DMA 1 +#define MAX_DMA_LEN SZ_64K +#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) +#else +#undef SPI_PXA2XX_USE_DMA +#define MAX_DMA_LEN 0 +#define DEFAULT_DMA_CR1 0 +#endif + +#ifdef SPI_PXA2XX_USE_DMA extern bool pxa2xx_spi_dma_is_possible(size_t len); extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data); extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); |