diff options
| author | Axel Lin <axel.lin@ingics.com> | 2014-01-12 10:40:22 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-01-13 14:15:13 +0400 |
| commit | 3ab546205411a245ef0f60ec708467a072855c6f (patch) | |
| tree | 70c1b063182a1a8d28819318d525e8eab6ada0fa /drivers/spi | |
| parent | 52690a6a868719d1d2f9e12b039c05d966600d41 (diff) | |
| download | linux-3ab546205411a245ef0f60ec708467a072855c6f.tar.xz | |
spi: ti-qspi: Simplify qspi_write_msg and qspi_read_msg implementation
Make the unit of wlen to be byte, and simplify the code to avoid duplicate
code for different wlen cases.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-ti-qspi.c | 61 |
1 files changed, 20 insertions, 41 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index 1211b663c814..a850b403b51b 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -208,53 +208,36 @@ static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t) txbuf = t->tx_buf; cmd = qspi->cmd | QSPI_WR_SNGL; count = t->len; - wlen = t->bits_per_word; + wlen = t->bits_per_word >> 3; /* in bytes */ while (count) { switch (wlen) { - case 8: + case 1: dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n", cmd, qspi->dc, *txbuf); writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG); - ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); - ret = wait_for_completion_timeout(&qspi->transfer_complete, - QSPI_COMPLETION_TIMEOUT); - if (ret == 0) { - dev_err(qspi->dev, "write timed out\n"); - return -ETIMEDOUT; - } - txbuf += 1; - count -= 1; break; - case 16: + case 2: dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n", cmd, qspi->dc, *txbuf); writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); - ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); - ret = wait_for_completion_timeout(&qspi->transfer_complete, - QSPI_COMPLETION_TIMEOUT); - if (ret == 0) { - dev_err(qspi->dev, "write timed out\n"); - return -ETIMEDOUT; - } - txbuf += 2; - count -= 2; break; - case 32: + case 4: dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n", cmd, qspi->dc, *txbuf); writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); - ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); - ret = wait_for_completion_timeout(&qspi->transfer_complete, - QSPI_COMPLETION_TIMEOUT); - if (ret == 0) { - dev_err(qspi->dev, "write timed out\n"); - return -ETIMEDOUT; - } - txbuf += 4; - count -= 4; break; } + + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); + ret = wait_for_completion_timeout(&qspi->transfer_complete, + QSPI_COMPLETION_TIMEOUT); + if (ret == 0) { + dev_err(qspi->dev, "write timed out\n"); + return -ETIMEDOUT; + } + txbuf += wlen; + count -= wlen; } return 0; @@ -280,7 +263,7 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t) break; } count = t->len; - wlen = t->bits_per_word; + wlen = t->bits_per_word >> 3; /* in bytes */ while (count) { dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); @@ -292,22 +275,18 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t) return -ETIMEDOUT; } switch (wlen) { - case 8: + case 1: *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG); - rxbuf += 1; - count -= 1; break; - case 16: + case 2: *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); - rxbuf += 2; - count -= 2; break; - case 32: + case 4: *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); - rxbuf += 4; - count -= 4; break; } + rxbuf += wlen; + count -= wlen; } return 0; |