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spi: altera: Clean up the use of variable d

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The variable d is used in rather questionable way. Rework the code
a bit so it's clearer what it does. Also, rename the variable from
d to data to make it's name less mysterious. Finally, change it's
data type to uint32_t , since it's accessed as a 32bit number.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Pavel Machek <pavel@denx.de>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
This commit is contained in:
Marek Vasut 2014-10-22 21:56:02 +02:00 committed by Jagannadha Sutradharudu Teki
parent 80d7333808
commit bc76b821f0
1 changed files with 13 additions and 10 deletions
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23
drivers/spi/altera_spi.c
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@ -126,10 +126,10 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
{
struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
/* assume spi core configured to do 8 bit transfers */
uint bytes = bitlen / 8;
const uchar *txp = dout;
uchar *rxp = din;
uint32_t reg, start;
unsigned int bytes = bitlen / 8;
const unsigned char *txp = dout;
unsigned char *rxp = din;
uint32_t reg, data, start;
debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
slave->bus, slave->cs, bitlen, bytes, flags);
@ -150,10 +150,13 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
spi_cs_activate(slave);
while (bytes--) {
uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL;
if (txp)
data = *txp++;
else
data = CONFIG_ALTERA_SPI_IDLE_VAL;
debug("%s: tx:%x ", __func__, d);
writel(d, &altspi->regs->txdata);
debug("%s: tx:%x ", __func__, data);
writel(data, &altspi->regs->txdata);
start = get_timer(0);
while (1) {
@ -166,11 +169,11 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
}
}
d = readl(&altspi->regs->rxdata);
data = readl(&altspi->regs->rxdata);
if (rxp)
*rxp++ = d;
*rxp++ = data & 0xff;
debug("rx:%x\n", d);
debug("rx:%x\n", data);
}
done: