int cadence_qspi_apb_process_queue(struct struct_cqspi *cadence_qspi,
struct spi_device *spi, unsigned int n_trans,
struct spi_transfer **spi_xfer)
{
struct platform_device *pdev = cadence_qspi->pdev;
struct cqspi_platform_data *pdata = pdev->dev.platform_data;
struct spi_transfer *cmd_xfer = spi_xfer[0];
struct spi_transfer *data_xfer = (n_trans >= 2) ? spi_xfer[1] : NULL;
void __iomem *iobase = cadence_qspi->iobase;
unsigned int sclk;
int ret = 0;
struct cqspi_flash_pdata *f_pdata;
pr_debug("%s %d\n", __func__, n_trans);
if (!cmd_xfer->len) {
pr_err("QSPI: SPI transfer length is 0.\n");
return -EINVAL;
}
/* Switch chip select. */
if (cadence_qspi->current_cs != spi->chip_select) {
cadence_qspi->current_cs = spi->chip_select;
cadence_qspi_switch_cs(cadence_qspi, spi->chip_select);
}
/* Setup baudrate divisor and delays */
f_pdata = &(pdata->f_pdata[cadence_qspi->current_cs]);
sclk = cmd_xfer->speed_hz ?
cmd_xfer->speed_hz : spi->max_speed_hz;
cadence_qspi_apb_controller_disable(iobase);
cadence_qspi_apb_config_baudrate_div(iobase,
pdata->master_ref_clk_hz, sclk);
cadence_qspi_apb_delay(cadence_qspi,
pdata->master_ref_clk_hz, sclk);
cadence_qspi_apb_readdata_capture(iobase, 1,
f_pdata->read_delay);
cadence_qspi_apb_controller_enable(iobase);
/*
* Use STIG command to send if the transfer length is less than
* 4 or if only one transfer.
*/
if ((cmd_xfer->len < 4) || (n_trans == 1)) {
/* STIG command */
if (data_xfer && data_xfer->rx_buf) {
/* STIG read */
ret = cadence_qspi_apb_command_read(iobase,
cmd_xfer->len, cmd_xfer->tx_buf,
data_xfer->len, data_xfer->rx_buf);
} else {
/* STIG write */
ret = cadence_qspi_apb_command_write(iobase,
cmd_xfer->len, cmd_xfer->tx_buf);
}
} else if (cmd_xfer->len >= 4 && (n_trans == 2)){
/* Indirect operation */
if (data_xfer->rx_buf) {
/* Indirect read */
ret = cadence_qspi_apb_indirect_read_setup(iobase,
pdata->qspi_ahb_phy, cmd_xfer->len,
cmd_xfer->tx_buf, spi->addr_width);
if (pdata->enable_dma) {
ret = cadence_qspi_apb_indirect_read_dma(
cadence_qspi, data_xfer->len,
data_xfer->rx_buf);
} else {
ret = cadence_qspi_apb_indirect_read_execute(
cadence_qspi, data_xfer->len,
data_xfer->rx_buf);
}
} else {
/* Indirect write */
ret = cadence_qspi_apb_indirect_write_setup(
iobase, pdata->qspi_ahb_phy,
cmd_xfer->len, cmd_xfer->tx_buf);
if (pdata->enable_dma) {
ret = cadence_qspi_apb_indirect_write_dma(
cadence_qspi, data_xfer->len,
(unsigned char *)data_xfer->tx_buf);
} else {
ret = cadence_qspi_apb_indirect_write_execute(
cadence_qspi, data_xfer->len,
data_xfer->tx_buf);
}
}
} else {
pr_err("QSPI : Unknown SPI transfer.\n");
return -EINVAL;
}
return ret;
}
static int cadence_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = dev->parent;
struct cadence_spi_platdata *plat = bus->platdata;
struct cadence_spi_priv *priv = dev_get_priv(bus);
void *base = priv->regbase;
u8 *cmd_buf = priv->cmd_buf;
size_t data_bytes;
int err = 0;
u32 mode = CQSPI_STIG_WRITE;
if (flags & SPI_XFER_BEGIN) {
/* copy command to local buffer */
priv->cmd_len = bitlen / 8;
memcpy(cmd_buf, dout, priv->cmd_len);
}
if (flags == (SPI_XFER_BEGIN | SPI_XFER_END)) {
/* if start and end bit are set, the data bytes is 0. */
data_bytes = 0;
} else {
data_bytes = bitlen / 8;
}
debug("%s: len=%d [bytes]\n", __func__, data_bytes);
/* Set Chip select */
cadence_qspi_apb_chipselect(base, spi_chip_select(dev),
CONFIG_CQSPI_DECODER);
if ((flags & SPI_XFER_END) || (flags == 0)) {
if (priv->cmd_len == 0) {
printf("QSPI: Error, command is empty.\n");
return -1;
}
if (din && data_bytes) {
/* read */
/* Use STIG if no address. */
if (!CQSPI_IS_ADDR(priv->cmd_len))
mode = CQSPI_STIG_READ;
else
mode = CQSPI_INDIRECT_READ;
} else if (dout && !(flags & SPI_XFER_BEGIN)) {
/* write */
if (!CQSPI_IS_ADDR(priv->cmd_len))
mode = CQSPI_STIG_WRITE;
else
mode = CQSPI_INDIRECT_WRITE;
}
switch (mode) {
case CQSPI_STIG_READ:
err = cadence_qspi_apb_command_read(
base, priv->cmd_len, cmd_buf,
data_bytes, din);
break;
case CQSPI_STIG_WRITE:
err = cadence_qspi_apb_command_write(base,
priv->cmd_len, cmd_buf,
data_bytes, dout);
break;
case CQSPI_INDIRECT_READ:
err = cadence_qspi_apb_indirect_read_setup(plat,
priv->cmd_len, cmd_buf);
if (!err) {
err = cadence_qspi_apb_indirect_read_execute
(plat, data_bytes, din);
}
break;
case CQSPI_INDIRECT_WRITE:
err = cadence_qspi_apb_indirect_write_setup
(plat, priv->cmd_len, cmd_buf);
if (!err) {
err = cadence_qspi_apb_indirect_write_execute
(plat, data_bytes, dout);
}
break;
default:
err = -1;
break;
}
if (flags & SPI_XFER_END) {
/* clear command buffer */
memset(cmd_buf, 0, sizeof(priv->cmd_buf));
priv->cmd_len = 0;
}
}
return err;
}
