diff options
| author |   Vignesh Raghavendra <vigneshr@ti.com> | 2019-08-06 10:40:39 +0530 |
|---|---|---|
| committer |   Tudor Ambarus <tudor.ambarus@microchip.com> | 2019-08-12 10:53:48 +0300 |
| commit | f173f26a4d543fa57e6ed9505bbbbf9bec61f544 (patch) | |
| tree | f5fbd6bedb3a629bdde7c11193f737819cabeb12 /include/linux/mtd | |
| parent | Linus 5.3-rc1 (diff) | |
| download | linux-dev-f173f26a4d543fa57e6ed9505bbbbf9bec61f544.tar.xz linux-dev-f173f26a4d543fa57e6ed9505bbbbf9bec61f544.zip | |
mtd: spi-nor: always use bounce buffer for register read/writes
spi-mem layer expects all buffers passed to it to be DMA'able. But
spi-nor layer mostly allocates buffers on stack for reading/writing to
registers and therefore are not DMA'able. Introduce bounce buffer to be
used to read/write to registers. This ensures that buffer passed to
spi-mem layer during register read/writes is DMA'able. With this change
nor->cmd-buf is no longer used, so drop it.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Diffstat (limited to 'include/linux/mtd')
| -rw-r--r-- | include/linux/mtd/spi-nor.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index 9f57cdfcc93d..6b5956a7a65a 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -344,6 +344,9 @@ struct flash_info; * @mtd: point to a mtd_info structure * @lock: the lock for the read/write/erase/lock/unlock operations * @dev: point to a spi device, or a spi nor controller device. + * @bouncebuf: bounce buffer used when the buffer passed by the MTD + * layer is not DMA-able + * @bouncebuf_size: size of the bounce buffer * @info: spi-nor part JDEC MFR id and other info * @page_size: the page size of the SPI NOR * @addr_width: number of address bytes @@ -356,7 +359,6 @@ struct flash_info; * @read_proto: the SPI protocol for read operations * @write_proto: the SPI protocol for write operations * @reg_proto the SPI protocol for read_reg/write_reg/erase operations - * @cmd_buf: used by the write_reg * @erase_map: the erase map of the SPI NOR * @prepare: [OPTIONAL] do some preparations for the * read/write/erase/lock/unlock operations @@ -382,6 +384,8 @@ struct spi_nor { struct mtd_info mtd; struct mutex lock; struct device *dev; + u8 *bouncebuf; + size_t bouncebuf_size; const struct flash_info *info; u32 page_size; u8 addr_width; @@ -394,7 +398,6 @@ struct spi_nor { enum spi_nor_protocol reg_proto; bool sst_write_second; u32 flags; - u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE]; struct spi_nor_erase_map erase_map; int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops); |