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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>
This commit is contained in:
Axel Lin 2014-01-12 14:40:22 +08:00 committed by Mark Brown
parent 52690a6a86
commit 3ab5462054
1 changed files with 20 additions and 41 deletions
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51
drivers/spi/spi-ti-qspi.c
View File

@ -208,42 +208,27 @@ 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);
break;
}
ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
ret = wait_for_completion_timeout(&qspi->transfer_complete,
QSPI_COMPLETION_TIMEOUT);
@ -251,10 +236,8 @@ static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t)
dev_err(qspi->dev, "write timed out\n");
return -ETIMEDOUT;
}
txbuf += 4;
count -= 4;
break;
}
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;