static irqreturn_t interrupt_transfer(struct dw_spi *dws)
{
u16 irq_status = dw_readl(dws, DW_SPI_ISR);
/* Error handling */
if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
dw_readl(dws, DW_SPI_ICR);
int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
return IRQ_HANDLED;
}
dw_reader(dws);
if (dws->rx_end == dws->rx) {
spi_mask_intr(dws, SPI_INT_TXEI);
spi_finalize_current_transfer(dws->master);
return IRQ_HANDLED;
}
if (irq_status & SPI_INT_TXEI) {
spi_mask_intr(dws, SPI_INT_TXEI);
dw_writer(dws);
/* Enable TX irq always, it will be disabled when RX finished */
spi_umask_intr(dws, SPI_INT_TXEI);
}
return IRQ_HANDLED;
}
static int reader_all(struct dw_spi *dws)
{
while (!(dw_readw(dws, SPIM_SR) & SR_RF_EMPT)
&& (dws->rx < dws->rx_end)) {
dw_reader(dws);
wait_till_not_busy(dws);
}
return dws->rx == dws->rx_end;
}
/* Must be called inside pump_transfers() */
static int poll_transfer(struct dw_spi *dws)
{
do {
dw_writer(dws);
dw_reader(dws);
cpu_relax();
} while (dws->rx_end > dws->rx);
return 0;
}
