void spi_dw_isr(void *arg)
{
struct device *dev = (struct device *)arg;
const struct spi_dw_config *info = dev->config->config_info;
u32_t error = 0;
u32_t int_status;
int_status = read_isr(info->regs);
SYS_LOG_DBG("SPI int_status 0x%x - (tx: %d, rx: %d)",
int_status, read_txflr(info->regs), read_rxflr(info->regs));
if (int_status & DW_SPI_ISR_ERRORS_MASK) {
error = 1;
goto out;
}
if (int_status & DW_SPI_ISR_RXFIS) {
pull_data(dev);
}
if (int_status & DW_SPI_ISR_TXEIS) {
push_data(dev);
}
out:
clear_interrupts(info->regs);
completed(dev, error);
}
static void push_data(struct device *dev)
{
struct spi_dw_config *info = dev->config->config_info;
struct spi_dw_data *spi = dev->driver_data;
uint32_t data = 0;
uint32_t f_tx;
DBG_COUNTER_INIT();
f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs) -
read_rxflr(info->regs) - 1;
while (f_tx) {
if (spi->tx_buf && spi->tx_buf_len > 0) {
switch (spi->dfs) {
case 1:
data = UNALIGNED_GET((uint8_t *)(spi->tx_buf));
break;
case 2:
data = UNALIGNED_GET((uint16_t *)(spi->tx_buf));
break;
#ifndef CONFIG_ARC
case 4:
data = UNALIGNED_GET((uint32_t *)(spi->tx_buf));
break;
#endif
}
spi->tx_buf += spi->dfs;
spi->tx_buf_len--;
} else if (spi->rx_buf && spi->rx_buf_len > 0) {
/* No need to push more than necessary */
if (spi->rx_buf_len - spi->fifo_diff <= 0) {
break;
}
data = 0;
} else {
/* Nothing to push anymore */
break;
}
write_dr(data, info->regs);
f_tx--;
spi->fifo_diff++;
DBG_COUNTER_INC();
}
if (!spi->tx_buf_len && !spi->rx_buf_len) {
write_txftlr(0, info->regs);
}
DBG("Pushed: %d\n", DBG_COUNTER_RESULT());
}
static void push_data(struct device *dev)
{
const struct spi_dw_config *info = dev->config->config_info;
struct spi_dw_data *spi = dev->driver_data;
u32_t data = 0;
u32_t f_tx;
DBG_COUNTER_INIT();
if (spi->rx_buf) {
f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs) -
read_rxflr(info->regs);
if ((int)f_tx < 0) {
f_tx = 0; /* if rx-fifo is full, hold off tx */
}
} else {
f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs);
}
if (f_tx && (spi->tx_buf_len == 0)) {
/* room in fifo, yet nothing to send */
spi->last_tx = 1; /* setting last_tx indicates TX is done */
}
while (f_tx) {
if (spi->tx_buf && spi->tx_buf_len > 0) {
switch (spi->dfs) {
case 1:
data = UNALIGNED_GET((u8_t *)(spi->tx_buf));
break;
case 2:
data = UNALIGNED_GET((u16_t *)(spi->tx_buf));
break;
#ifndef CONFIG_ARC
case 4:
data = UNALIGNED_GET((u32_t *)(spi->tx_buf));
break;
#endif
}
spi->tx_buf += spi->dfs;
spi->tx_buf_len--;
} else if (spi->rx_buf && spi->rx_buf_len > 0) {
/* No need to push more than necessary */
if (spi->rx_buf_len - spi->fifo_diff <= 0) {
break;
}
data = 0;
} else {
/* Nothing to push anymore */
break;
}
write_dr(data, info->regs);
f_tx--;
spi->fifo_diff++;
DBG_COUNTER_INC();
}
if (spi->last_tx) {
write_txftlr(0, info->regs);
/* prevents any further interrupts demanding TX fifo fill */
}
SYS_LOG_DBG("Pushed: %d", DBG_COUNTER_RESULT());
}
static void push_data(struct device *dev)
{
const struct spi_dw_config *info = dev->config->config_info;
struct spi_dw_data *spi = dev->driver_data;
u32_t data = 0U;
u32_t f_tx;
DBG_COUNTER_INIT();
if (spi_context_rx_on(&spi->ctx)) {
f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs) -
read_rxflr(info->regs);
if ((int)f_tx < 0) {
f_tx = 0U; /* if rx-fifo is full, hold off tx */
}
} else {
f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs);
}
while (f_tx) {
if (spi_context_tx_buf_on(&spi->ctx)) {
switch (spi->dfs) {
case 1:
data = UNALIGNED_GET((u8_t *)
(spi->ctx.tx_buf));
break;
case 2:
data = UNALIGNED_GET((u16_t *)
(spi->ctx.tx_buf));
break;
#ifndef CONFIG_ARC
case 4:
data = UNALIGNED_GET((u32_t *)
(spi->ctx.tx_buf));
break;
#endif
}
} else if (spi_context_rx_on(&spi->ctx)) {
/* No need to push more than necessary */
if ((int)(spi->ctx.rx_len - spi->fifo_diff) <= 0) {
break;
}
data = 0U;
} else if (spi_context_tx_on(&spi->ctx)) {
data = 0U;
} else {
/* Nothing to push anymore */
break;
}
write_dr(data, info->regs);
spi_context_update_tx(&spi->ctx, spi->dfs, 1);
spi->fifo_diff++;
f_tx--;
DBG_COUNTER_INC();
}
if (!spi_context_tx_on(&spi->ctx)) {
/* prevents any further interrupts demanding TX fifo fill */
write_txftlr(0, info->regs);
}
LOG_DBG("Pushed: %d", DBG_COUNTER_RESULT());
}
