static int zynq_qspi_transfer(struct spi_device *qspi,
struct spi_transfer *transfer)
{
struct zynq_qspi *zqspi = &qspi->master;
unsigned cs_change = 1;
int status = 0;
debug("%s\n", __func__);
while (1) {
if (transfer->bits_per_word || transfer->speed_hz) {
status = zynq_qspi_setup_transfer(qspi, transfer);
if (status < 0)
break;
}
/* Select the chip if required */
if (cs_change)
zynq_qspi_chipselect(qspi, 1);
cs_change = transfer->cs_change;
if (!transfer->tx_buf && !transfer->rx_buf && transfer->len) {
status = -1;
break;
}
/* Request the transfer */
if (transfer->len) {
status = zynq_qspi_start_transfer(qspi, transfer);
zqspi->is_inst = 0;
}
if (status != transfer->len) {
if (status > 0)
status = -EMSGSIZE;
break;
}
status = 0;
if (transfer->delay_usecs)
udelay(transfer->delay_usecs);
if (cs_change)
/* Deselect the chip */
zynq_qspi_chipselect(qspi, 0);
break;
}
zynq_qspi_setup_transfer(qspi, NULL);
return 0;
}
static int zynq_qspi_transfer(struct zynq_qspi_priv *priv)
{
unsigned cs_change = 1;
int status = 0;
debug("%s\n", __func__);
while (1) {
/* Select the chip if required */
if (cs_change)
zynq_qspi_chipselect(priv, 1);
cs_change = priv->cs_change;
if (!priv->txbuf && !priv->rxbuf && priv->len) {
status = -1;
break;
}
/* Request the transfer */
if (priv->len) {
status = zynq_qspi_start_transfer(priv);
priv->is_inst = 0;
}
if (status != priv->len) {
if (status > 0)
status = -EMSGSIZE;
debug("zynq_qspi_transfer:%d len:%d\n", status, priv->len);
break;
}
status = 0;
if (cs_change)
/* Deselect the chip */
zynq_qspi_chipselect(priv, 0);
break;
}
return 0;
}