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| author | Purna Chandra Mandal <purna.chandra.mandal@intel.com> | 2019-01-27 21:02:29 -0800 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2019-02-10 15:06:31 +0100 |
| commit | 9558281572e35a86c8072d47c23ae6c9cdae2149 (patch) | |
| tree | ddfc752d64fa692810ec829a9c548785471afed4 /drivers/mtd | |
| parent | 748df6d831871ca2338644e6c61a84a02a8e2786 (diff) | |
| download | linux-9558281572e35a86c8072d47c23ae6c9cdae2149.tar.gz | |
mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode
cadence-quadspi controller allows upto eight bytes of data to be written in software Triggered Instruction generator (STIG) mode of operation. Lower 4 bytes are written through writedatalower and upper 4 bytes by writedataupper register. This patch allows all the 8 bytes to be written. Signed-off-by: Purna Chandra Mandal <purna.chandra.mandal@intel.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Reviewed-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/cadence-quadspi.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c index 04cedd3a2bf6..7f78f9409ddd 100644 --- a/drivers/mtd/spi-nor/cadence-quadspi.c +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -418,9 +418,10 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode, void __iomem *reg_base = cqspi->iobase; unsigned int reg; unsigned int data; + u32 write_len; int ret; - if (n_tx > 4 || (n_tx && !txbuf)) { + if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) { dev_err(nor->dev, "Invalid input argument, cmdlen %d txbuf 0x%p\n", n_tx, txbuf); @@ -433,10 +434,18 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode, reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; data = 0; - memcpy(&data, txbuf, n_tx); + write_len = (n_tx > 4) ? 4 : n_tx; + memcpy(&data, txbuf, write_len); + txbuf += write_len; writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER); - } + if (n_tx > 4) { + data = 0; + write_len = n_tx - 4; + memcpy(&data, txbuf, write_len); + writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER); + } + } ret = cqspi_exec_flash_cmd(cqspi, reg); return ret; } |