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spi: altera: Consolidate TX/RX data register access 

The patterns for accessing the TX/RX data registers is the same for the IRQ
and non-IRQ paths. Consolidate the duplicated code into shared helper
functions.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Lars-Peter Clausen 2017-08-16 11:33:12 +02:00 committed by Mark Brown
parent e19b63cd3c
commit b64836a571
1 changed files with 35 additions and 40 deletions
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75
drivers/spi/spi-altera.c
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@ -76,18 +76,43 @@ static void altera_spi_set_cs(struct spi_device *spi, bool is_high)
}
}
static inline unsigned int hw_txbyte(struct altera_spi *hw, int count)
static void altera_spi_tx_word(struct altera_spi *hw)
{
unsigned int txd = 0;
if (hw->tx) {
switch (hw->bytes_per_word) {
case 1:
return hw->tx[count];
txd = hw->tx[hw->count];
break;
case 2:
return (hw->tx[count * 2]
| (hw->tx[count * 2 + 1] << 8));
txd = (hw->tx[hw->count * 2]
| (hw->tx[hw->count * 2 + 1] << 8));
break;
}
}
return 0;
writel(txd, hw->base + ALTERA_SPI_TXDATA);
}
static void altera_spi_rx_word(struct altera_spi *hw)
{
unsigned int rxd;
rxd = readl(hw->base + ALTERA_SPI_RXDATA);
if (hw->rx) {
switch (hw->bytes_per_word) {
case 1:
hw->rx[hw->count] = rxd;
break;
case 2:
hw->rx[hw->count * 2] = rxd;
hw->rx[hw->count * 2 + 1] = rxd >> 8;
break;
}
}
hw->count++;
}
static int altera_spi_txrx(struct spi_master *master,
@ -107,32 +132,16 @@ static int altera_spi_txrx(struct spi_master *master,
writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
/* send the first byte */
writel(hw_txbyte(hw, 0), hw->base + ALTERA_SPI_TXDATA);
altera_spi_tx_word(hw);
} else {
while (hw->count < hw->len) {
unsigned int rxd;
writel(hw_txbyte(hw, hw->count),
hw->base + ALTERA_SPI_TXDATA);
altera_spi_tx_word(hw);
while (!(readl(hw->base + ALTERA_SPI_STATUS) &
ALTERA_SPI_STATUS_RRDY_MSK))
cpu_relax();
rxd = readl(hw->base + ALTERA_SPI_RXDATA);
if (hw->rx) {
switch (hw->bytes_per_word) {
case 1:
hw->rx[hw->count] = rxd;
break;
case 2:
hw->rx[hw->count * 2] = rxd;
hw->rx[hw->count * 2 + 1] = rxd >> 8;
break;
}
}
hw->count++;
altera_spi_rx_word(hw);
}
spi_finalize_current_transfer(master);
}
@ -144,25 +153,11 @@ static irqreturn_t altera_spi_irq(int irq, void *dev)
{
struct spi_master *master = dev;
struct altera_spi *hw = spi_master_get_devdata(master);
unsigned int rxd;
rxd = readl(hw->base + ALTERA_SPI_RXDATA);
if (hw->rx) {
switch (hw->bytes_per_word) {
case 1:
hw->rx[hw->count] = rxd;
break;
case 2:
hw->rx[hw->count * 2] = rxd;
hw->rx[hw->count * 2 + 1] = rxd >> 8;
break;
}
}
hw->count++;
altera_spi_rx_word(hw);
if (hw->count < hw->len) {
writel(hw_txbyte(hw, hw->count), hw->base + ALTERA_SPI_TXDATA);
altera_spi_tx_word(hw);
} else {
/* disable receive interrupt */
hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK;