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| author | Vignesh R <vigneshr@ti.com> | 2016-06-08 12:18:31 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-06-08 10:26:46 +0100 |
| commit | f4502dd1da9b060a49d539eb754ff86cb97b89f0 (patch) | |
| tree | 257cf2635e5b8931b06e331f678490a71817100d /include/linux/spi | |
| parent | 1a695a905c18548062509178b98bc91e67510864 (diff) | |
| download | lwn-f4502dd1da9b060a49d539eb754ff86cb97b89f0.tar.gz lwn-f4502dd1da9b060a49d539eb754ff86cb97b89f0.zip | |
spi: Add DMA support for spi_flash_read()
Few SPI devices provide accelerated read interfaces to read from
SPI-NOR flash devices. These hardwares also support DMA to transfer data
from flash to memory either via mem-to-mem DMA or dedicated slave DMA
channels. Hence, add support for DMA in order to improve throughput and
reduce CPU load.
Use spi_map_buf() to get sg table for the buffer and pass it to SPI
driver.
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 1f03483f61e5..7b53af4ba5f8 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -1143,6 +1143,8 @@ static inline ssize_t spi_w8r16be(struct spi_device *spi, u8 cmd) * @opcode_nbits: number of lines to send opcode * @addr_nbits: number of lines to send address * @data_nbits: number of lines for data + * @rx_sg: Scatterlist for receive data read from flash + * @cur_msg_mapped: message has been mapped for DMA */ struct spi_flash_read_message { void *buf; @@ -1155,6 +1157,8 @@ struct spi_flash_read_message { u8 opcode_nbits; u8 addr_nbits; u8 data_nbits; + struct sg_table rx_sg; + bool cur_msg_mapped; }; /* SPI core interface for flash read support */ |