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mtd: spi-nor: always use bounce buffer for register read/writes

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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>
This commit is contained in:
Vignesh Raghavendra 2019-08-06 10:40:39 +05:30 • committed by Tudor Ambarus
parent 5f9e832c13
commit f173f26a4d
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GPG key ID: 4B554F47A58D14E9
2 changed files with 49 additions and 38 deletions
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7
include/linux/mtd/spi-nor.h
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@ -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);