spi_nxp_lpspi: Convert DMA version to native code

Convert the DMA-based LPSPI driver to native code.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>

Author: decsny

drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi_dma.c

@@ -64,8 +64,7 @@ static int spi_mcux_dma_tx_load(const struct device *dev, const uint8_t *buf, si
 		stream->dma_cfg.channel_direction = MEMORY_TO_PERIPHERAL;
 	}
 
-	/* Dest is always LPSPI tx fifo */
-	blk_cfg->dest_address = LPSPI_GetTxRegisterAddress(base);
+	blk_cfg->dest_address = (uint32_t) &(base->TDR);
 
 	return dma_config(stream->dma_dev, stream->channel, &stream->dma_cfg);
 }
@@ -87,7 +86,7 @@ static int spi_mcux_dma_rx_load(const struct device *dev, uint8_t *buf, size_t l
 		blk_cfg->dest_address = (uint32_t)buf;
 	}
 
-	blk_cfg->source_address = LPSPI_GetRxRegisterAddress(base);
+	blk_cfg->source_address = (uint32_t) &(base->RDR);
 
 	return dma_config(stream->dma_dev, stream->channel, &stream->dma_cfg);
 }
@@ -173,7 +172,7 @@ static void spi_mcux_dma_callback(const struct device *dev, void *arg, uint32_t
 	}
 
 	while (IS_ENABLED(CONFIG_SOC_FAMILY_NXP_IMXRT) &&
-		(LPSPI_GetStatusFlags(base) & kLPSPI_ModuleBusyFlag)) {
+		(base->SR & LPSPI_SR_MBF_MASK)) {
 		/* wait until module is idle */
 	}
 
@@ -190,11 +189,11 @@ static void spi_mcux_dma_callback(const struct device *dev, void *arg, uint32_t
 error:
 	LOG_ERR("DMA callback error with channel %d err %d.", channel, status);
 done:
-	LPSPI_DisableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);
+	base->DER &= ~(LPSPI_DER_TDDE_MASK | LPSPI_DER_RDDE_MASK);
 	base->TCR &= ~LPSPI_TCR_CONT_MASK;
 	lpspi_wait_tx_fifo_empty(spi_dev);
 	spi_context_cs_control(ctx, false);
-	LPSPI_FlushFifo(base, true, true);
+	base->CR |= LPSPI_CR_RTF_MASK | LPSPI_CR_RRF_MASK;
 	spi_context_complete(ctx, spi_dev, status);
 }
 
@@ -227,9 +226,9 @@ static int transceive_dma(const struct device *dev, const struct spi_config *spi
 		return ret;
 	}
 
-	LPSPI_FlushFifo(base, true, true);
+	base->CR |= LPSPI_CR_RTF_MASK | LPSPI_CR_RRF_MASK;
 
-	LPSPI_EnableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);
+	base->DER |= LPSPI_DER_TDDE_MASK | LPSPI_DER_RDDE_MASK;
 
 	ret = spi_context_wait_for_completion(ctx);
 out: