658 lines
18 KiB
C
658 lines
18 KiB
C
/*
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* Copyright (c) 2018, NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nxp_imx_lpspi
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#include <errno.h>
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#include <zephyr/drivers/spi.h>
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#include <zephyr/drivers/clock_control.h>
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#include <fsl_lpspi.h>
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#include <zephyr/logging/log.h>
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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#include <zephyr/drivers/dma.h>
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#endif
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#ifdef CONFIG_PINCTRL
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#include <zephyr/drivers/pinctrl.h>
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#endif /* CONFIG_PINCTRL */
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LOG_MODULE_REGISTER(spi_mcux_lpspi, CONFIG_SPI_LOG_LEVEL);
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#include "spi_context.h"
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#define CHIP_SELECT_COUNT 4
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#define MAX_DATA_WIDTH 4096
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struct spi_mcux_config {
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LPSPI_Type *base;
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const struct device *clock_dev;
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clock_control_subsys_t clock_subsys;
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void (*irq_config_func)(const struct device *dev);
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uint32_t pcs_sck_delay;
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uint32_t sck_pcs_delay;
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uint32_t transfer_delay;
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#ifdef CONFIG_PINCTRL
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const struct pinctrl_dev_config *pincfg;
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#endif /* CONFIG_PINCTRL */
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};
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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#define SPI_MCUX_LPSPI_DMA_ERROR_FLAG 0x01
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#define SPI_MCUX_LPSPI_DMA_RX_DONE_FLAG 0x02
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#define SPI_MCUX_LPSPI_DMA_TX_DONE_FLAG 0x04
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#define SPI_MCUX_LPSPI_DMA_DONE_FLAG \
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(SPI_MCUX_LPSPI_DMA_RX_DONE_FLAG | SPI_MCUX_LPSPI_DMA_TX_DONE_FLAG)
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struct stream {
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const struct device *dma_dev;
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uint32_t channel; /* stores the channel for dma */
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struct dma_config dma_cfg;
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struct dma_block_config dma_blk_cfg;
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};
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#endif
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struct spi_mcux_data {
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const struct device *dev;
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lpspi_master_handle_t handle;
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struct spi_context ctx;
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size_t transfer_len;
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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volatile uint32_t status_flags;
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struct stream dma_rx;
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struct stream dma_tx;
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/* dummy value used for transferring NOP when tx buf is null */
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uint32_t dummy_tx_buffer;
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/* dummy value used to read RX data into when rx buf is null */
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uint32_t dummy_rx_buffer;
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#endif
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};
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static void spi_mcux_transfer_next_packet(const struct device *dev)
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{
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const struct spi_mcux_config *config = dev->config;
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struct spi_mcux_data *data = dev->data;
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LPSPI_Type *base = config->base;
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struct spi_context *ctx = &data->ctx;
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lpspi_transfer_t transfer;
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status_t status;
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if ((ctx->tx_len == 0) && (ctx->rx_len == 0)) {
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/* nothing left to rx or tx, we're done! */
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spi_context_cs_control(&data->ctx, false);
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spi_context_complete(&data->ctx, 0);
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return;
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}
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transfer.configFlags = kLPSPI_MasterPcsContinuous |
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(ctx->config->slave << LPSPI_MASTER_PCS_SHIFT);
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if (ctx->tx_len == 0) {
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/* rx only, nothing to tx */
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transfer.txData = NULL;
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transfer.rxData = ctx->rx_buf;
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transfer.dataSize = ctx->rx_len;
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} else if (ctx->rx_len == 0) {
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/* tx only, nothing to rx */
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transfer.txData = (uint8_t *) ctx->tx_buf;
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transfer.rxData = NULL;
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transfer.dataSize = ctx->tx_len;
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} else if (ctx->tx_len == ctx->rx_len) {
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/* rx and tx are the same length */
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transfer.txData = (uint8_t *) ctx->tx_buf;
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transfer.rxData = ctx->rx_buf;
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transfer.dataSize = ctx->tx_len;
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} else if (ctx->tx_len > ctx->rx_len) {
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/* Break up the tx into multiple transfers so we don't have to
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* rx into a longer intermediate buffer. Leave chip select
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* active between transfers.
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*/
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transfer.txData = (uint8_t *) ctx->tx_buf;
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transfer.rxData = ctx->rx_buf;
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transfer.dataSize = ctx->rx_len;
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transfer.configFlags |= kLPSPI_MasterPcsContinuous;
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} else {
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/* Break up the rx into multiple transfers so we don't have to
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* tx from a longer intermediate buffer. Leave chip select
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* active between transfers.
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*/
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transfer.txData = (uint8_t *) ctx->tx_buf;
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transfer.rxData = ctx->rx_buf;
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transfer.dataSize = ctx->tx_len;
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transfer.configFlags |= kLPSPI_MasterPcsContinuous;
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}
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if (!(ctx->tx_count <= 1 && ctx->rx_count <= 1)) {
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transfer.configFlags |= kLPSPI_MasterPcsContinuous;
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}
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data->transfer_len = transfer.dataSize;
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status = LPSPI_MasterTransferNonBlocking(base, &data->handle,
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&transfer);
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if (status != kStatus_Success) {
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LOG_ERR("Transfer could not start");
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}
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}
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static void spi_mcux_isr(const struct device *dev)
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{
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const struct spi_mcux_config *config = dev->config;
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struct spi_mcux_data *data = dev->data;
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LPSPI_Type *base = config->base;
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LPSPI_MasterTransferHandleIRQ(base, &data->handle);
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}
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static void spi_mcux_master_transfer_callback(LPSPI_Type *base,
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lpspi_master_handle_t *handle, status_t status, void *userData)
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{
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struct spi_mcux_data *data = userData;
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spi_context_update_tx(&data->ctx, 1, data->transfer_len);
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spi_context_update_rx(&data->ctx, 1, data->transfer_len);
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spi_mcux_transfer_next_packet(data->dev);
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}
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static int spi_mcux_configure(const struct device *dev,
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const struct spi_config *spi_cfg)
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{
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const struct spi_mcux_config *config = dev->config;
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struct spi_mcux_data *data = dev->data;
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LPSPI_Type *base = config->base;
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lpspi_master_config_t master_config;
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uint32_t clock_freq;
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uint32_t word_size;
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if (spi_context_configured(&data->ctx, spi_cfg)) {
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/* This configuration is already in use */
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return 0;
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}
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if (spi_cfg->operation & SPI_HALF_DUPLEX) {
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LOG_ERR("Half-duplex not supported");
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return -ENOTSUP;
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}
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LPSPI_MasterGetDefaultConfig(&master_config);
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if (spi_cfg->slave > CHIP_SELECT_COUNT) {
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LOG_ERR("Slave %d is greater than %d",
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spi_cfg->slave,
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CHIP_SELECT_COUNT);
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return -EINVAL;
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}
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word_size = SPI_WORD_SIZE_GET(spi_cfg->operation);
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if (word_size > MAX_DATA_WIDTH) {
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LOG_ERR("Word size %d is greater than %d",
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word_size, MAX_DATA_WIDTH);
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return -EINVAL;
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}
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master_config.bitsPerFrame = word_size;
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master_config.cpol =
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(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL)
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? kLPSPI_ClockPolarityActiveLow
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: kLPSPI_ClockPolarityActiveHigh;
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master_config.cpha =
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(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA)
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? kLPSPI_ClockPhaseSecondEdge
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: kLPSPI_ClockPhaseFirstEdge;
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master_config.direction =
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(spi_cfg->operation & SPI_TRANSFER_LSB)
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? kLPSPI_LsbFirst
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: kLPSPI_MsbFirst;
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master_config.baudRate = spi_cfg->frequency;
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master_config.pcsToSckDelayInNanoSec = config->pcs_sck_delay;
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master_config.lastSckToPcsDelayInNanoSec = config->sck_pcs_delay;
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master_config.betweenTransferDelayInNanoSec = config->transfer_delay;
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if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
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&clock_freq)) {
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return -EINVAL;
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}
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LPSPI_MasterInit(base, &master_config, clock_freq);
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LPSPI_MasterTransferCreateHandle(base, &data->handle,
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spi_mcux_master_transfer_callback,
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data);
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LPSPI_SetDummyData(base, 0);
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data->ctx.config = spi_cfg;
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return 0;
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}
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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/* This function is executed in the interrupt context */
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static void spi_mcux_dma_callback(const struct device *dev, void *arg,
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uint32_t channel, int status)
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{
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/* arg directly holds the spi device */
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struct spi_mcux_data *data = arg;
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if (status != 0) {
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LOG_ERR("DMA callback error with channel %d.", channel);
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data->status_flags |= SPI_MCUX_LPSPI_DMA_ERROR_FLAG;
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} else {
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/* identify the origin of this callback */
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if (channel == data->dma_tx.channel) {
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/* this part of the transfer ends */
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data->status_flags |= SPI_MCUX_LPSPI_DMA_TX_DONE_FLAG;
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LOG_DBG("DMA TX Block Complete");
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} else if (channel == data->dma_rx.channel) {
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/* this part of the transfer ends */
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data->status_flags |= SPI_MCUX_LPSPI_DMA_RX_DONE_FLAG;
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LOG_DBG("DMA RX Block Complete");
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} else {
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LOG_ERR("DMA callback channel %d is not valid.",
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channel);
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data->status_flags |= SPI_MCUX_LPSPI_DMA_ERROR_FLAG;
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}
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}
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spi_context_complete(&data->ctx, 0);
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}
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static int spi_mcux_dma_tx_load(const struct device *dev, const uint8_t *buf, size_t len)
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{
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const struct spi_mcux_config *cfg = dev->config;
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struct spi_mcux_data *data = dev->data;
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struct dma_block_config *blk_cfg;
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LPSPI_Type *base = cfg->base;
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/* remember active TX DMA channel (used in callback) */
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struct stream *stream = &data->dma_tx;
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blk_cfg = &stream->dma_blk_cfg;
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/* prepare the block for this TX DMA channel */
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memset(blk_cfg, 0, sizeof(struct dma_block_config));
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if (buf == NULL) {
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/* Treat the transfer as a peripheral to peripheral one, so that DMA
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* reads from this address each time
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*/
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blk_cfg->source_address = (uint32_t)&data->dummy_tx_buffer;
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stream->dma_cfg.channel_direction = PERIPHERAL_TO_PERIPHERAL;
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} else {
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/* tx direction has memory as source and periph as dest. */
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blk_cfg->source_address = (uint32_t)buf;
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stream->dma_cfg.channel_direction = MEMORY_TO_PERIPHERAL;
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}
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/* Enable scatter/gather */
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blk_cfg->source_gather_en = 1;
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/* Dest is LPSPI tx fifo */
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blk_cfg->dest_address = LPSPI_GetTxRegisterAddress(base);
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blk_cfg->block_size = len;
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/* Transfer 1 byte each DMA loop */
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stream->dma_cfg.source_burst_length = 1;
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stream->dma_cfg.head_block = &stream->dma_blk_cfg;
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/* give the client dev as arg, as the callback comes from the dma */
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stream->dma_cfg.user_data = data;
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/* pass our client origin to the dma: data->dma_tx.dma_channel */
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return dma_config(data->dma_tx.dma_dev, data->dma_tx.channel,
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&stream->dma_cfg);
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}
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static int spi_mcux_dma_rx_load(const struct device *dev, uint8_t *buf,
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size_t len)
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{
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const struct spi_mcux_config *cfg = dev->config;
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struct spi_mcux_data *data = dev->data;
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struct dma_block_config *blk_cfg;
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LPSPI_Type *base = cfg->base;
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/* retrieve active RX DMA channel (used in callback) */
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struct stream *stream = &data->dma_rx;
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blk_cfg = &stream->dma_blk_cfg;
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/* prepare the block for this RX DMA channel */
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memset(blk_cfg, 0, sizeof(struct dma_block_config));
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if (buf == NULL) {
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/* Treat the transfer as a peripheral to peripheral one, so that DMA
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* reads from this address each time
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*/
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blk_cfg->dest_address = (uint32_t)&data->dummy_rx_buffer;
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stream->dma_cfg.channel_direction = PERIPHERAL_TO_PERIPHERAL;
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} else {
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/* rx direction has periph as source and mem as dest. */
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blk_cfg->dest_address = (uint32_t)buf;
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stream->dma_cfg.channel_direction = PERIPHERAL_TO_MEMORY;
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}
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blk_cfg->block_size = len;
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/* Enable scatter/gather */
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blk_cfg->dest_scatter_en = 1;
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/* Source is LPSPI rx fifo */
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blk_cfg->source_address = LPSPI_GetRxRegisterAddress(base);
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stream->dma_cfg.source_burst_length = 1;
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stream->dma_cfg.head_block = blk_cfg;
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stream->dma_cfg.user_data = data;
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/* pass our client origin to the dma: data->dma_rx.channel */
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return dma_config(data->dma_rx.dma_dev, data->dma_rx.channel,
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&stream->dma_cfg);
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}
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static int wait_dma_rx_tx_done(const struct device *dev)
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{
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struct spi_mcux_data *data = dev->data;
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int ret = -1;
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while (1) {
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ret = spi_context_wait_for_completion(&data->ctx);
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if (ret) {
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LOG_DBG("Timed out waiting for SPI context to complete");
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return ret;
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}
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if (data->status_flags & SPI_MCUX_LPSPI_DMA_ERROR_FLAG) {
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return -EIO;
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}
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if ((data->status_flags & SPI_MCUX_LPSPI_DMA_DONE_FLAG) ==
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SPI_MCUX_LPSPI_DMA_DONE_FLAG) {
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LOG_DBG("DMA block completed");
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return 0;
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}
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}
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}
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static int transceive_dma(const struct device *dev,
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const struct spi_config *spi_cfg,
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const struct spi_buf_set *tx_bufs,
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const struct spi_buf_set *rx_bufs,
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bool asynchronous,
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struct k_poll_signal *sig)
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{
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const struct spi_mcux_config *config = dev->config;
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struct spi_mcux_data *data = dev->data;
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LPSPI_Type *base = config->base;
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int ret;
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size_t dma_size;
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spi_context_lock(&data->ctx, asynchronous, sig, spi_cfg);
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ret = spi_mcux_configure(dev, spi_cfg);
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if (ret) {
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goto out;
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}
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spi_context_buffers_setup(&data->ctx, tx_bufs, rx_bufs, 1);
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spi_context_cs_control(&data->ctx, true);
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/* DMA is fast enough watermarks are not required */
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LPSPI_SetFifoWatermarks(base, 0U, 0U);
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/* Send each spi buf via DMA, updating context as DMA completes */
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while (data->ctx.rx_len > 0 || data->ctx.tx_len > 0) {
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/* Clear status flags */
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data->status_flags = 0U;
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/* Load dma blocks of equal length */
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dma_size = MIN(data->ctx.tx_len, data->ctx.rx_len);
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if (dma_size == 0) {
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dma_size = MAX(data->ctx.tx_len, data->ctx.rx_len);
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}
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ret = spi_mcux_dma_tx_load(dev, data->ctx.tx_buf, dma_size);
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if (ret != 0) {
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goto out;
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}
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ret = spi_mcux_dma_rx_load(dev, data->ctx.rx_buf, dma_size);
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if (ret != 0) {
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goto out;
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}
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/* Start DMA */
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ret = dma_start(data->dma_tx.dma_dev, data->dma_tx.channel);
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if (ret != 0) {
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goto out;
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}
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ret = dma_start(data->dma_rx.dma_dev, data->dma_rx.channel);
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if (ret != 0) {
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goto out;
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}
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/* Enable DMA Requests */
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LPSPI_EnableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);
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/* Wait for DMA to finish */
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ret = wait_dma_rx_tx_done(dev);
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if (ret != 0) {
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goto out;
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}
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while ((LPSPI_GetStatusFlags(base) & kLPSPI_ModuleBusyFlag)) {
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/* wait until module is idle */
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}
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/* Disable DMA */
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LPSPI_DisableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);
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/* Update SPI contexts with amount of data we just sent */
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spi_context_update_tx(&data->ctx, 1, dma_size);
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spi_context_update_rx(&data->ctx, 1, dma_size);
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}
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spi_context_cs_control(&data->ctx, false);
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out:
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spi_context_release(&data->ctx, ret);
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return ret;
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}
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#endif
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static int transceive(const struct device *dev,
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const struct spi_config *spi_cfg,
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const struct spi_buf_set *tx_bufs,
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const struct spi_buf_set *rx_bufs,
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bool asynchronous,
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struct k_poll_signal *signal)
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{
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struct spi_mcux_data *data = dev->data;
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int ret;
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spi_context_lock(&data->ctx, asynchronous, signal, spi_cfg);
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ret = spi_mcux_configure(dev, spi_cfg);
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if (ret) {
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goto out;
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}
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spi_context_buffers_setup(&data->ctx, tx_bufs, rx_bufs, 1);
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spi_context_cs_control(&data->ctx, true);
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spi_mcux_transfer_next_packet(dev);
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ret = spi_context_wait_for_completion(&data->ctx);
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out:
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spi_context_release(&data->ctx, ret);
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return ret;
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}
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static int spi_mcux_transceive(const struct device *dev,
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const struct spi_config *spi_cfg,
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const struct spi_buf_set *tx_bufs,
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const struct spi_buf_set *rx_bufs)
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{
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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return transceive_dma(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL);
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#endif /* CONFIG_SPI_MCUX_LPSPI_DMA */
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return transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL);
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}
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#ifdef CONFIG_SPI_ASYNC
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static int spi_mcux_transceive_async(const struct device *dev,
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const struct spi_config *spi_cfg,
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const struct spi_buf_set *tx_bufs,
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const struct spi_buf_set *rx_bufs,
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struct k_poll_signal *async)
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{
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return transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, async);
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}
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#endif /* CONFIG_SPI_ASYNC */
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static int spi_mcux_release(const struct device *dev,
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const struct spi_config *spi_cfg)
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{
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struct spi_mcux_data *data = dev->data;
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spi_context_unlock_unconditionally(&data->ctx);
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return 0;
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}
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static int spi_mcux_init(const struct device *dev)
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{
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int err;
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const struct spi_mcux_config *config = dev->config;
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struct spi_mcux_data *data = dev->data;
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config->irq_config_func(dev);
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err = spi_context_cs_configure_all(&data->ctx);
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if (err < 0) {
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return err;
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}
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|
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spi_context_unlock_unconditionally(&data->ctx);
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|
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data->dev = dev;
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|
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#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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if (!device_is_ready(data->dma_tx.dma_dev)) {
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LOG_ERR("%s device is not ready", data->dma_tx.dma_dev->name);
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return -ENODEV;
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}
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|
|
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if (!device_is_ready(data->dma_rx.dma_dev)) {
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LOG_ERR("%s device is not ready", data->dma_rx.dma_dev->name);
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return -ENODEV;
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}
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#endif /* CONFIG_SPI_MCUX_LPSPI_DMA */
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|
|
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#ifdef CONFIG_PINCTRL
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err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
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if (err) {
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return err;
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}
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#endif /* CONFIG_PINCTRL */
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|
|
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spi_context_unlock_unconditionally(&data->ctx);
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|
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return 0;
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}
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|
|
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static const struct spi_driver_api spi_mcux_driver_api = {
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.transceive = spi_mcux_transceive,
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#ifdef CONFIG_SPI_ASYNC
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.transceive_async = spi_mcux_transceive_async,
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#endif
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.release = spi_mcux_release,
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};
|
|
|
|
#ifdef CONFIG_SPI_MCUX_LPSPI_DMA
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#define SPI_DMA_CHANNELS(n) \
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.dma_tx = { \
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.dma_dev = DEVICE_DT_GET(DT_INST_DMAS_CTLR_BY_NAME(n, tx)), \
|
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.channel = \
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DT_INST_DMAS_CELL_BY_NAME(n, tx, mux), \
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.dma_cfg = { \
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.channel_direction = MEMORY_TO_PERIPHERAL, \
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.dma_callback = spi_mcux_dma_callback, \
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.source_data_size = 1, \
|
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.dest_data_size = 1, \
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.block_count = 1, \
|
|
.dma_slot = DT_INST_DMAS_CELL_BY_NAME(n, tx, source) \
|
|
} \
|
|
}, \
|
|
.dma_rx = { \
|
|
.dma_dev = DEVICE_DT_GET(DT_INST_DMAS_CTLR_BY_NAME(n, rx)), \
|
|
.channel = \
|
|
DT_INST_DMAS_CELL_BY_NAME(n, rx, mux), \
|
|
.dma_cfg = { \
|
|
.channel_direction = PERIPHERAL_TO_MEMORY, \
|
|
.dma_callback = spi_mcux_dma_callback, \
|
|
.source_data_size = 1, \
|
|
.dest_data_size = 1, \
|
|
.block_count = 1, \
|
|
.dma_slot = DT_INST_DMAS_CELL_BY_NAME(n, rx, source) \
|
|
} \
|
|
}
|
|
#else
|
|
#define SPI_DMA_CHANNELS(n)
|
|
#endif /* CONFIG_SPI_MCUX_LPSPI_DMA */
|
|
|
|
#ifdef CONFIG_PINCTRL
|
|
#define SPI_MCUX_LPSPI_PINCTRL_DEFINE(n) PINCTRL_DT_INST_DEFINE(n);
|
|
#define SPI_MCUX_LPSPI_PINCTRL_INIT(n) .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),
|
|
#else
|
|
#define SPI_MCUX_LPSPI_PINCTRL_DEFINE(n)
|
|
#define SPI_MCUX_LPSPI_PINCTRL_INIT(n)
|
|
#endif /* CONFIG_PINCTRL */
|
|
|
|
|
|
#define SPI_MCUX_LPSPI_INIT(n) \
|
|
SPI_MCUX_LPSPI_PINCTRL_DEFINE(n) \
|
|
\
|
|
static void spi_mcux_config_func_##n(const struct device *dev); \
|
|
\
|
|
static const struct spi_mcux_config spi_mcux_config_##n = { \
|
|
.base = (LPSPI_Type *) DT_INST_REG_ADDR(n), \
|
|
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
|
|
.clock_subsys = \
|
|
(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name), \
|
|
.irq_config_func = spi_mcux_config_func_##n, \
|
|
.pcs_sck_delay = UTIL_AND( \
|
|
DT_INST_NODE_HAS_PROP(n, pcs_sck_delay), \
|
|
DT_INST_PROP(n, pcs_sck_delay)), \
|
|
.sck_pcs_delay = UTIL_AND( \
|
|
DT_INST_NODE_HAS_PROP(n, sck_pcs_delay), \
|
|
DT_INST_PROP(n, sck_pcs_delay)), \
|
|
.transfer_delay = UTIL_AND( \
|
|
DT_INST_NODE_HAS_PROP(n, transfer_delay), \
|
|
DT_INST_PROP(n, transfer_delay)), \
|
|
SPI_MCUX_LPSPI_PINCTRL_INIT(n) \
|
|
}; \
|
|
\
|
|
static struct spi_mcux_data spi_mcux_data_##n = { \
|
|
SPI_CONTEXT_INIT_LOCK(spi_mcux_data_##n, ctx), \
|
|
SPI_CONTEXT_INIT_SYNC(spi_mcux_data_##n, ctx), \
|
|
SPI_CONTEXT_CS_GPIOS_INITIALIZE(DT_DRV_INST(n), ctx) \
|
|
SPI_DMA_CHANNELS(n) \
|
|
}; \
|
|
\
|
|
DEVICE_DT_INST_DEFINE(n, &spi_mcux_init, NULL, \
|
|
&spi_mcux_data_##n, \
|
|
&spi_mcux_config_##n, POST_KERNEL, \
|
|
CONFIG_SPI_INIT_PRIORITY, \
|
|
&spi_mcux_driver_api); \
|
|
\
|
|
static void spi_mcux_config_func_##n(const struct device *dev) \
|
|
{ \
|
|
IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), \
|
|
spi_mcux_isr, DEVICE_DT_INST_GET(n), 0); \
|
|
\
|
|
irq_enable(DT_INST_IRQN(n)); \
|
|
}
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(SPI_MCUX_LPSPI_INIT)
|