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;
}
/* Calibration sequence to determine the read data capture delay register */
static int spi_calibration(struct udevice *bus)
{
struct cadence_spi_platdata *plat = bus->platdata;
struct cadence_spi_priv *priv = dev_get_priv(bus);
void *base = priv->regbase;
u8 opcode_rdid = 0x9F;
unsigned int idcode = 0, temp = 0;
int err = 0, i, range_lo = -1, range_hi = -1;
/* start with slowest clock (1 MHz) */
cadence_spi_write_speed(bus, 1000000);
/* configure the read data capture delay register to 0 */
cadence_qspi_apb_readdata_capture(base, 1, 0);
/* Enable QSPI */
cadence_qspi_apb_controller_enable(base);
/* read the ID which will be our golden value */
err = cadence_qspi_apb_command_read(base, 1, &opcode_rdid,
3, (u8 *)&idcode);
if (err) {
puts("SF: Calibration failed (read)\n");
return err;
}
/* use back the intended clock and find low range */
cadence_spi_write_speed(bus, plat->max_hz);
for (i = 0; i < CQSPI_READ_CAPTURE_MAX_DELAY; i++) {
/* Disable QSPI */
cadence_qspi_apb_controller_disable(base);
/* reconfigure the read data capture delay register */
cadence_qspi_apb_readdata_capture(base, 1, i);
/* Enable back QSPI */
cadence_qspi_apb_controller_enable(base);
/* issue a RDID to get the ID value */
err = cadence_qspi_apb_command_read(base, 1, &opcode_rdid,
3, (u8 *)&temp);
if (err) {
puts("SF: Calibration failed (read)\n");
return err;
}
/* search for range lo */
if (range_lo == -1 && temp == idcode) {
range_lo = i;
continue;
}
/* search for range hi */
if (range_lo != -1 && temp != idcode) {
range_hi = i - 1;
break;
}
range_hi = i;
}
if (range_lo == -1) {
puts("SF: Calibration failed (low range)\n");
return err;
}
/* Disable QSPI for subsequent initialization */
cadence_qspi_apb_controller_disable(base);
/* configure the final value for read data capture delay register */
cadence_qspi_apb_readdata_capture(base, 1, (range_hi + range_lo) / 2);
debug("SF: Read data capture delay calibrated to %i (%i - %i)\n",
(range_hi + range_lo) / 2, range_lo, range_hi);
/* just to ensure we do once only when speed or chip select change */
priv->qspi_calibrated_hz = plat->max_hz;
priv->qspi_calibrated_cs = spi_chip_select(bus);
return 0;
}
