static void spi_transaction_do (cyg_spi_device* device, cyg_bool tick_only,
cyg_bool polled, cyg_uint32 count,
const cyg_uint8* tx_data, cyg_uint8* rx_data,
cyg_bool drop_cs)
{
cyg_spi_freescale_dspi_bus_t* dspi_bus =
(cyg_spi_freescale_dspi_bus_t*) device->spi_bus;
cyg_spi_freescale_dspi_device_t* dspi_device =
(cyg_spi_freescale_dspi_device_t*) device;
cyg_bool bus_16bit = dspi_device->clocking.bus_16bit;
cyghwr_devs_freescale_dspi_t* dspi_p = dspi_bus->setup_p->dspi_p;
cyghwr_hal_freescale_dma_set_t* dma_set_p;
cyghwr_hal_freescale_edma_t* edma_p = NULL;
cyg_uint32 count_down;
cyg_uint32 txfifo_n = dspi_bus->txfifo_n;
cyg_uint32 pushr;
cyg_uint32 pushque_n;
cyg_uint32 dma_chan_rx_i = 0;
cyg_uint32 dma_chan_tx_i = 0;
#if DEBUG_SPI >= 2
cyg_uint32 first_turn = 1;
#endif
DEBUG2_PRINTF("DSPI: transaction: count=%d drop_cs=%d\n", count, drop_cs);
// Set up peripheral CS field. DSPI automatically asserts and deasserts CS
pushr = dspi_chip_select_set(tick_only ? -1 : dspi_device->dev_num,
dspi_p->mcr & FREESCALE_DSPI_MCR_PCSSE_M, true);
pushr |= FREESCALE_DSPI_PUSHR_CONT_M;
dspi_fifo_clear(dspi_p);
dspi_fifo_drain(dspi_p);
pushque_n = dspi_bus->pushque_n;
if(bus_16bit)
txfifo_n *= 2;
if((dma_set_p=dspi_bus->setup_p->dma_set_p)) {
edma_p = dma_set_p->edma_p;
// Set up the DMA channels.
dma_chan_rx_i = SPI_DMA_CHAN_I(dma_set_p, RX);
dma_chan_tx_i = SPI_DMA_CHAN_I(dma_set_p, TX);
rx_dma_channel_setup(dma_set_p, (cyg_uint8*) rx_data,
bus_16bit, &edma_p->tcd[dma_chan_rx_i]);
hal_freescale_edma_erq_enable(edma_p, dma_chan_rx_i);
}
if(!polled)
cyg_drv_interrupt_unmask(dspi_bus->setup_p->intr_num);
count_down = count;
while(count_down) {
#if DEBUG_SPI >= 2
if(first_turn) {
if(dspi_bus->pushque_p)
dspi_bus->pushque_p[0] |= FREESCALE_DSPI_PUSHR_CTCNT_M;
first_turn = 0;
}
#endif
if(dma_set_p && (count_down > txfifo_n)) {
// Transfer size is larger than DSPI FIFO
// Use DMA Tx
count_down = tx_dma_channel_setup(dspi_bus, (cyg_uint8*) tx_data,
count_down, bus_16bit,
pushr, drop_cs);
#if DEBUG_SPI >= 3
hal_freescale_edma_transfer_diag(edma_p, dma_chan_rx_i, true);
#endif
// Enable the Tx DMA / SPI controller.
hal_freescale_edma_erq_enable(edma_p, dma_chan_tx_i);
DSPI_EOQ_CLEAR(dspi_p);
} else {
// Transfer size fits within DSPI FIFO
// No need for DMA Tx
DSPI_EOQ_CLEAR(dspi_p);
count_down = fifo_pushque_fill(dspi_bus, (cyg_uint8*) tx_data,
count_down, bus_16bit,
pushr, drop_cs);
#if DEBUG_SPI >= 3
cyghwr_devs_freescale_dspi_diag(dspi_bus);
#endif
}
if(polled) {
DEBUG2_PRINTF("DSPI Polled:\n");
// Busy-wait for DSPI/DMA (polling for completion).
while(!(dspi_p->sr & FREESCALE_DSPI_SR_EOQF_M));
if(dma_set_p) // Disable the Tx DMA channel on completion.
hal_freescale_edma_erq_disable(edma_p, dma_chan_tx_i);
} else {
// Wait for DSPI/DMA completion. (interrupt driven).
cyg_drv_mutex_lock(&dspi_bus->transfer_mutex);
cyg_drv_dsr_lock();
DSPI_IRQ_ENABLE(dspi_p);
DEBUG2_PRINTF("DSPI IRQ: Enabled\n");
// Sit back and wait for the ISR/DSRs to signal completion.
cyg_drv_cond_wait (&dspi_bus->transfer_done);
cyg_drv_dsr_unlock();
cyg_drv_mutex_unlock(&dspi_bus->transfer_mutex);
}
if(dma_set_p) {
// Make sure that Rx has been drained by DMA.
if(rx_data)
while((dspi_p->sr & FREESCALE_DSPI_SR_RFDF_M));
} else {
// No DMA - "manually" drain Rx FIFO
DEBUG2_PRINTF("DSPI FIFO: 'Manually' drain Rx fifo\n");
#if DEBUG_SPI >= 3
cyghwr_devs_freescale_dspi_diag(dspi_bus);
#endif
if(rx_data) {
if(bus_16bit) {
cyg_uint16* rx_data16 = (cyg_uint16*) rx_data;
while(dspi_p->sr & FREESCALE_DSPI_SR_RXCTR_M)
*rx_data16++ = dspi_p->popr;
rx_data = (cyg_uint8*) rx_data16;
} else {
while(dspi_p->sr & FREESCALE_DSPI_SR_RXCTR_M)
*rx_data++ = dspi_p->popr;
}
} else {
dspi_fifo_drain(dspi_p);
}
}
dspi_fifo_clear(dspi_p);
// Prepare for next iteration
if(tx_data) {
tx_data += pushque_n;
if(bus_16bit)
tx_data += pushque_n;
}
}
if(dma_set_p && rx_data) {
// Rx buffer may be out of sync with cache.
DEBUG2_PRINTF("DSPI DMA: Invalidate cache\n");
HAL_DCACHE_INVALIDATE(rx_data, count);
DEBUG2_PRINTF("DSPI DMA: Cache invalidated\n");
}
if(!polled)
cyg_drv_interrupt_mask(dspi_bus->setup_p->intr_num);
dspi_device->chip_sel = !drop_cs;
}
static void spi_transaction_do (cyg_spi_device* device, cyg_bool tick_only,
cyg_bool polled, cyg_uint32 count,
const cyg_uint8* tx_data, cyg_uint8* rx_data,
cyg_bool drop_cs)
{
cyg_spi_freescale_dspi_bus_t* dspi_bus =
(cyg_spi_freescale_dspi_bus_t*) device->spi_bus;
cyg_spi_freescale_dspi_device_t* dspi_device =
(cyg_spi_freescale_dspi_device_t*) device;
cyg_bool bus_16bit = dspi_device->clocking.bus_16bit;
cyghwr_devs_freescale_dspi_t* dspi_p = dspi_bus->setup_p->dspi_p;
cyghwr_hal_freescale_dma_set_t* dma_set_p;
cyghwr_hal_freescale_edma_t* edma_p = NULL;
cyg_uint32 count_down;
cyg_uint32 txfifo_n = dspi_bus->txfifo_n;
cyg_uint32 pushr;
cyg_uint32 pushque_n;
cyg_uint32 dma_chan_rx_i = 0;
cyg_uint32 dma_chan_tx_i = 0;
cyg_uint8* rx_data0;
#if DEBUG_SPI >= 2
cyg_uint32 first_turn = 1;
#endif
DEBUG2_PRINTF("DSPI: transaction: count=%d drop_cs=%d tick_only=%d\n",
count, drop_cs, tick_only);
// Set up peripheral CS field. DSPI automatically asserts and deasserts CS
pushr =
#ifndef CYGOPT_DEVS_SPI_FREESCALE_DSPI_TICK_ONLY_DROPS_CS
// Compatibility option
// eCos Reference Manual states that CS should drop prior to sending
// ticks, but other SPI drivers do not touch the CS.
tick_only ? dspi_p->pushr & 0x87FF0000 :
#endif
dspi_chip_select_set(
#ifdef CYGOPT_DEVS_SPI_FREESCALE_DSPI_TICK_ONLY_DROPS_CS
// Compatibility option. See comment above.
tick_only ? -1 :
#endif
dspi_device->dev_num,
dspi_p->mcr & FREESCALE_DSPI_MCR_PCSSE_M, true);
pushr |= FREESCALE_DSPI_PUSHR_CONT_M;
dspi_fifo_clear(dspi_p);
pushque_n = dspi_bus->pushque_n;
if(bus_16bit)
txfifo_n *= 2;
dma_set_p = dspi_bus->setup_p->dma_set_p;
if((count > txfifo_n) && dma_set_p) {
rx_data0 = rx_data;
edma_p = dma_set_p->edma_p;
// Set up the DMA channels.
dma_chan_rx_i = SPI_DMA_CHAN_I(dma_set_p, RX);
dma_chan_tx_i = SPI_DMA_CHAN_I(dma_set_p, TX);
rx_dma_channel_setup(dma_set_p, (cyg_uint8*) rx_data,
bus_16bit, &edma_p->tcd[dma_chan_rx_i]);
hal_freescale_edma_erq_enable(edma_p, dma_chan_rx_i);
dspi_irq_enable(dspi_p,
FREESCALE_DSPI_RSER_TFFF_RE_M |
FREESCALE_DSPI_RSER_RFDF_RE_M |
FREESCALE_DSPI_RSER_TFFF_DIRS_M |
FREESCALE_DSPI_RSER_RFDF_DIRS_M);
} else {
rx_data0 = NULL;
// If byte count fits in the FIFO don't bother with DMA.
if(dma_set_p) {
edma_p = dma_set_p->edma_p;
hal_freescale_edma_erq_disable(edma_p, SPI_DMA_CHAN_I(dma_set_p, RX));
}
dma_set_p = NULL;
dspi_irq_disable(dspi_p,
FREESCALE_DSPI_RSER_TFFF_RE_M |
FREESCALE_DSPI_RSER_RFDF_RE_M |
FREESCALE_DSPI_RSER_TFFF_DIRS_M |
FREESCALE_DSPI_RSER_RFDF_DIRS_M);
}
if(!polled)
cyg_drv_interrupt_unmask(dspi_bus->setup_p->intr_num);
count_down = count;
while(count_down) {
#if DEBUG_SPI >= 2
if(first_turn) {
if(dspi_bus->pushque_p)
dspi_bus->pushque_p[0] |= FREESCALE_DSPI_PUSHR_CTCNT_M;
first_turn = 0;
}
#endif
if(dma_set_p && (count_down > txfifo_n)) {
// Transfer size is larger than DSPI FIFO
// Use DMA Tx
count_down = tx_dma_channel_setup(dspi_bus, (cyg_uint8*) tx_data,
count_down, bus_16bit,
pushr, drop_cs);
#if DEBUG_SPI >= 3
hal_freescale_edma_transfer_diag(edma_p, dma_chan_rx_i, true);
#endif
// Enable the Tx DMA / SPI controller.
hal_freescale_edma_erq_enable(edma_p, dma_chan_tx_i);
DSPI_EOQ_CLEAR(dspi_p);
} else {
// Transfer size fits within DSPI FIFO
// No need for DMA Tx
DSPI_EOQ_CLEAR(dspi_p);
count_down = fifo_pushque_fill(dspi_bus, (cyg_uint8*) tx_data,
count_down, bus_16bit,
pushr, drop_cs);
#if DEBUG_SPI >= 3
cyghwr_devs_freescale_dspi_diag(dspi_bus);
#endif
}
if(polled) {
DEBUG2_PRINTF("DSPI Polled:\n");
// Busy-wait for DSPI/DMA (polling for completion).
while(!(dspi_p->sr & FREESCALE_DSPI_SR_EOQF_M));
if(dma_set_p) {
// Disable the Tx DMA channel on completion.
hal_freescale_edma_erq_disable(edma_p, dma_chan_tx_i);
}
} else {
// Wait for DSPI/DMA completion. (interrupt driven).
cyg_drv_mutex_lock(&dspi_bus->transfer_mutex);
cyg_drv_dsr_lock();
DSPI_IRQ_ENABLE(dspi_p);
DEBUG2_PRINTF("DSPI IRQ: Enabled\n");
// Sit back and wait for the ISR/DSRs to signal completion.
cyg_drv_cond_wait (&dspi_bus->transfer_done);
cyg_drv_dsr_unlock();
cyg_drv_mutex_unlock(&dspi_bus->transfer_mutex);
}
if(dma_set_p) {
// Make sure that Rx has been drained by DMA.
while((dspi_p->sr & FREESCALE_DSPI_SR_RFDF_M));
DEBUG2_PRINTF("Fifo Drained by DMA 0x%08x\n", dspi_p->sr);
if(count_down <= txfifo_n && count_down > 0) {
hal_freescale_edma_erq_disable(edma_p, dma_chan_rx_i);
dma_set_p = NULL;
}
} else {
// No DMA - "manually" drain Rx FIFO
DEBUG2_PRINTF("DSPI FIFO: 'Manually' drain Rx fifo rx_data=%p bus_16bit=%d\n",
rx_data, bus_16bit);
#if DEBUG_SPI >= 3
cyghwr_devs_freescale_dspi_diag(dspi_bus);
#endif
if(rx_data) {
if(bus_16bit) {
cyg_uint16* rx_data16 = (cyg_uint16*) rx_data;
while(dspi_p->sr & FREESCALE_DSPI_SR_RXCTR_M) {
DEBUG2_PRINTF(" Fifo Pull16 at %p\n", rx_data16);
*rx_data16++ = dspi_p->popr;
}
rx_data = (cyg_uint8*) rx_data16;
} else {
while(dspi_p->sr & FREESCALE_DSPI_SR_RXCTR_M) {
DEBUG2_PRINTF(" Fifo Pull at %p\n", rx_data);
*rx_data++ = dspi_p->popr;
}
}
}
dspi_fifo_drain(dspi_p);
}
dspi_fifo_clear(dspi_p);
// Prepare for next iteration
if(tx_data) {
tx_data += pushque_n;
if(bus_16bit)
tx_data += pushque_n;
}
}
if(rx_data0) {
// Rx buffer may be out of sync with cache.
DEBUG2_PRINTF("DSPI DMA: Flush cache %p len=%d\n", rx_data0, count);
HAL_DCACHE_INVALIDATE(rx_data0, count);
DEBUG2_PRINTF("DSPI DMA: Cache flushed\n");
}
if(!polled)
cyg_drv_interrupt_mask(dspi_bus->setup_p->intr_num);
dspi_device->chip_sel = !drop_cs;
DEBUG2_PRINTF("cyg_transaction_do() chip_sel = %d drop_cs = %d\n", dspi_device->chip_sel, drop_cs);
}