int qm_ss_spi_irq_transfer(const qm_ss_spi_t spi,
const qm_ss_spi_async_transfer_t *const xfer)
{
QM_CHECK(spi < QM_SS_SPI_NUM, -EINVAL);
QM_CHECK(xfer, -EINVAL);
/* Load and save initial control register */
uint32_t ctrl = __builtin_arc_lr(base[spi] + QM_SS_SPI_CTRL);
uint8_t tmode = (uint8_t)((ctrl & QM_SS_SPI_CTRL_TMOD_MASK) >>
QM_SS_SPI_CTRL_TMOD_OFFS);
uint8_t bytes = BYTES_PER_FRAME(ctrl);
QM_CHECK(tmode == QM_SS_SPI_TMOD_TX_RX ? (xfer->tx_len == xfer->rx_len)
: 1,
-EINVAL);
spi_async_transfer[spi] = xfer;
tx_c[spi] = xfer->tx_len;
rx_c[spi] = xfer->rx_len;
/* Set NDF (Number of Data Frames) in RX or EEPROM Read mode. (-1) */
if (tmode == QM_SS_SPI_TMOD_RX || tmode == QM_SS_SPI_TMOD_EEPROM_READ) {
ctrl &= ~QM_SS_SPI_CTRL_NDF_MASK;
ctrl |= ((xfer->rx_len - 1) << QM_SS_SPI_CTRL_NDF_OFFS) &
QM_SS_SPI_CTRL_NDF_MASK;
__builtin_arc_sr(ctrl, base[spi] + QM_SS_SPI_CTRL);
}
uint32_t ftlr =
(((FIFO_RX_W_MARK < xfer->rx_len ? FIFO_RX_W_MARK : xfer->rx_len) -
1)
<< QM_SS_SPI_FTLR_RFT_OFFS) &
QM_SS_SPI_FTLR_RFT_MASK;
__builtin_arc_sr(ftlr, base[spi] + QM_SS_SPI_FTLR);
/* Unmask all interrupts */
__builtin_arc_sr(QM_SS_SPI_INTR_ALL, base[spi] + QM_SS_SPI_INTR_MASK);
/* Enable SPI device */
QM_SS_REG_AUX_OR(base[spi] + QM_SS_SPI_SPIEN, QM_SS_SPI_SPIEN_EN);
/* RX only transfers need a dummy frame byte to be sent. */
if (tmode == QM_SS_SPI_TMOD_RX) {
fifo_write(spi, (uint8_t *)&dummy_frame, bytes);
}
return 0;
}
int qm_ss_spi_irq_transfer(const qm_ss_spi_t spi,
const qm_ss_spi_async_transfer_t *const xfer)
{
QM_CHECK(spi < QM_SS_SPI_NUM, -EINVAL);
QM_CHECK(xfer, -EINVAL);
/* Load and save initial control register */
uint32_t ctrl = __builtin_arc_lr(base[spi] + QM_SS_SPI_CTRL);
uint8_t tmode = (uint8_t)((ctrl & QM_SS_SPI_CTRL_TMOD_MASK) >>
QM_SS_SPI_CTRL_TMOD_OFFS);
QM_CHECK(tmode == QM_SS_SPI_TMOD_TX_RX ? (xfer->tx_len == xfer->rx_len)
: 1,
-EINVAL);
transfer[spi] = xfer;
tx_c[spi] = xfer->tx_len;
rx_c[spi] = xfer->rx_len;
tx_p[spi] = xfer->tx;
rx_p[spi] = xfer->rx;
/* RX only transfers need a dummy frame byte to be sent. */
if (tmode == QM_SS_SPI_TMOD_RX) {
tx_p[spi] = (uint8_t *)&dummy_frame;
tx_c[spi] = 1;
}
uint32_t ftlr =
(((FIFO_RX_W_MARK < xfer->rx_len ? FIFO_RX_W_MARK : xfer->rx_len) -
1)
<< QM_SS_SPI_FTLR_RFT_OFFS) &
QM_SS_SPI_FTLR_RFT_MASK;
__builtin_arc_sr(ftlr, base[spi] + QM_SS_SPI_FTLR);
/* Unmask all interrupts */
__builtin_arc_sr(QM_SS_SPI_INTR_ALL, base[spi] + QM_SS_SPI_INTR_MASK);
/* Enable SPI device */
QM_SS_REG_AUX_OR(base[spi] + QM_SS_SPI_SPIEN, QM_SS_SPI_SPIEN_EN);
return 0;
}
int qm_ss_spi_transfer(const qm_ss_spi_t spi,
const qm_ss_spi_transfer_t *const xfer,
qm_ss_spi_status_t *const status)
{
QM_CHECK(spi < QM_SS_SPI_NUM, -EINVAL);
QM_CHECK(xfer, -EINVAL);
uint32_t ctrl = __builtin_arc_lr(base[spi] + QM_SS_SPI_CTRL);
uint8_t tmode = (uint8_t)((ctrl & QM_SS_SPI_CTRL_TMOD_MASK) >>
QM_SS_SPI_CTRL_TMOD_OFFS);
QM_CHECK(tmode == QM_SS_SPI_TMOD_TX_RX ? (xfer->tx_len == xfer->rx_len)
: 1,
-EINVAL);
QM_CHECK(tmode == QM_SS_SPI_TMOD_TX ? (xfer->rx_len == 0) : 1, -EINVAL);
QM_CHECK(tmode == QM_SS_SPI_TMOD_EEPROM_READ ? (xfer->rx_len > 0) : 1,
-EINVAL);
QM_CHECK(tmode == QM_SS_SPI_TMOD_RX ? (xfer->rx_len > 0) : 1, -EINVAL);
QM_CHECK(tmode == QM_SS_SPI_TMOD_RX ? (xfer->tx_len == 0) : 1, -EINVAL);
uint32_t tx_cnt = xfer->tx_len;
uint32_t rx_cnt = xfer->rx_len;
uint8_t *rx_buffer = xfer->rx;
uint8_t *tx_buffer = xfer->tx;
int ret = 0;
/* Disable all SPI interrupts */
__builtin_arc_sr(0, base[spi] + QM_SS_SPI_INTR_MASK);
/* Set NDF (Number of Data Frames) in RX or EEPROM Read mode. (-1) */
if (tmode == QM_SS_SPI_TMOD_RX || tmode == QM_SS_SPI_TMOD_EEPROM_READ) {
ctrl &= ~QM_SS_SPI_CTRL_NDF_MASK;
ctrl |= ((xfer->rx_len - 1) << QM_SS_SPI_CTRL_NDF_OFFS) &
QM_SS_SPI_CTRL_NDF_MASK;
__builtin_arc_sr(ctrl, base[spi] + QM_SS_SPI_CTRL);
}
/* RX only transfers need a dummy frame to be sent. */
if (tmode == QM_SS_SPI_TMOD_RX) {
tx_buffer = (uint8_t *)&dummy_frame;
tx_cnt = 1;
}
/* Calculate number of bytes per frame (1 or 2)*/
uint8_t bytes = BYTES_PER_FRAME(ctrl);
/* Enable SPI device */
QM_SS_REG_AUX_OR(base[spi] + QM_SS_SPI_SPIEN, QM_SS_SPI_SPIEN_EN);
while (tx_cnt || rx_cnt) {
uint32_t sr = __builtin_arc_lr(base[spi] + QM_SS_SPI_SR);
/* Break and report error if RX FIFO has overflown */
if (__builtin_arc_lr(base[spi] + QM_SS_SPI_INTR_STAT) &
QM_SS_SPI_INTR_RXOI) {
ret = -EIO;
if (status) {
*status |= QM_SS_SPI_RX_OVERFLOW;
}
break;
}
/* Copy data to buffer as long RX-FIFO is not empty */
if (sr & QM_SS_SPI_SR_RFNE && rx_cnt) {
fifo_read(spi, rx_buffer, bytes);
rx_buffer += bytes;
rx_cnt--;
}
/* Copy data from buffer as long TX-FIFO is not full. */
if (sr & QM_SS_SPI_SR_TFNF && tx_cnt) {
fifo_write(spi, tx_buffer, bytes);
tx_buffer += bytes;
tx_cnt--;
}
}
/* Wait for last byte transfered */
while (__builtin_arc_lr(base[spi] + QM_SS_SPI_SR) & QM_SS_SPI_SR_BUSY)
;
spi_disable(spi);
return ret;
}
