drivers/spi/spi_mchp_mss.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2022 Microchip Technology Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT microchip_mpfs_spi

 #include <zephyr/device.h>
 #include <zephyr/drivers/spi.h>
 #include <zephyr/sys/sys_io.h>
 #include <zephyr/sys/util.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>

 LOG_MODULE_REGISTER(mss_spi, CONFIG_SPI_LOG_LEVEL);

 #include "spi_context.h"

 /* MSS SPI Register offsets */
 #define MSS_SPI_REG_CONTROL     (0x00)
 #define MSS_SPI_REG_TXRXDF_SIZE (0x04)
 #define MSS_SPI_REG_STATUS      (0x08)
 #define MSS_SPI_REG_INT_CLEAR   (0x0c)
 #define MSS_SPI_REG_RX_DATA     (0x10)
 #define MSS_SPI_REG_TX_DATA     (0x14)
 #define MSS_SPI_REG_CLK_GEN     (0x18)
 #define MSS_SPI_REG_SS          (0x1c)
 #define MSS_SPI_REG_MIS         (0x20)
 #define MSS_SPI_REG_RIS         (0x24)
 #define MSS_SPI_REG_CONTROL2    (0x28)
 #define MSS_SPI_REG_COMMAND     (0x2c)
 #define MSS_SPI_REG_PKTSIZE     (0x30)
 #define MSS_SPI_REG_CMD_SIZE    (0x34)
 #define MSS_SPI_REG_HWSTATUS    (0x38)
 #define MSS_SPI_REG_FRAMESUP    (0x50)

 /* SPICR bit definitions */
 #define MSS_SPI_CONTROL_ENABLE       BIT(0)
 #define MSS_SPI_CONTROL_MASTER       BIT(1)
 #define MSS_SPI_CONTROL_PROTO_MSK    BIT(2)
 #define MSS_SPI_CONTROL_PROTO_MOTO   (0 << 2)
 #define MSS_SPI_CONTROL_RX_DATA_INT  BIT(4)
 #define MSS_SPI_CONTROL_TX_DATA_INT  BIT(5)
 #define MSS_SPI_CONTROL_RX_OVER_INT  BIT(6)
 #define MSS_SPI_CONTROL_TX_UNDER_INT BIT(7)
 #define MSS_SPI_CONTROL_CNT_MSK      (0xffff << 8)
 #define MSS_SPI_CONTROL_CNT_SHF      (8)
 #define MSS_SPI_CONTROL_SPO          BIT(24)
 #define MSS_SPI_CONTROL_SPH          BIT(25)
 #define MSS_SPI_CONTROL_SPS          BIT(26)
 #define MSS_SPI_CONTROL_FRAMEURUN    BIT(27)
 #define MSS_SPI_CONTROL_CLKMODE      BIT(28)
 #define MSS_SPI_CONTROL_BIGFIFO      BIT(29)
 #define MSS_SPI_CONTROL_OENOFF       BIT(30)
 #define MSS_SPI_CONTROL_RESET        BIT(31)

 /* SPIFRAMESIZE bit definitions */
 #define MSS_SPI_FRAMESIZE_DEFAULT (8)

 /* SPISS bit definitions */
 #define MSS_SPI_SSEL_MASK (0xff)
 #define MSS_SPI_DIRECT    (0x100)
 #define MSS_SPI_SSELOUT   (0x200)
 #define MSS_SPI_MIN_SLAVE (0)
 #define MSS_SPI_MAX_SLAVE (7)

 /* SPIST bit definitions */
 #define MSS_SPI_STATUS_ACTIVE                 BIT(14)
 #define MSS_SPI_STATUS_SSEL                   BIT(13)
 #define MSS_SPI_STATUS_FRAMESTART             BIT(12)
 #define MSS_SPI_STATUS_TXFIFO_EMPTY_NEXT_READ BIT(11)
 #define MSS_SPI_STATUS_TXFIFO_EMPTY           BIT(10)
 #define MSS_SPI_STATUS_TXFIFO_FULL_NEXT_WRITE BIT(9)
 #define MSS_SPI_STATUS_TXFIFO_FULL            BIT(8)
 #define MSS_SPI_STATUS_RXFIFO_EMPTY_NEXT_READ BIT(7)
 #define MSS_SPI_STATUS_RXFIFO_EMPTY           BIT(6)
 #define MSS_SPI_STATUS_RXFIFO_FULL_NEXT_WRITE BIT(5)
 #define MSS_SPI_STATUS_RXFIFO_FULL            BIT(4)
 #define MSS_SPI_STATUS_TX_UNDERRUN            BIT(3)
 #define MSS_SPI_STATUS_RX_OVERFLOW            BIT(2)
 #define MSS_SPI_STATUS_RXDAT_RCED             BIT(1)
 #define MSS_SPI_STATUS_TXDAT_SENT             BIT(0)

 /* SPIINT register defines */
 #define MSS_SPI_INT_TXDONE       BIT(0)
 #define MSS_SPI_INT_RXRDY        BIT(1)
 #define MSS_SPI_INT_RX_CH_OVRFLW BIT(2)
 #define MSS_SPI_INT_TX_CH_UNDRUN BIT(3)
 #define MSS_SPI_INT_CMD          BIT(4)
 #define MSS_SPI_INT_SSEND        BIT(5)

 /* SPICOMMAND bit definitions */
 #define MSS_SPI_COMMAND_FIFO_MASK (0xC)

 /* SPIFRAMESUP bit definitions */
 #define MSS_SPI_FRAMESUP_UP_BYTES_MSK (0xFFFF << 16)
 #define MSS_SPI_FRAMESUP_LO_BYTES_MSK (0xFFFF << 0)

 struct mss_spi_config {
 	mm_reg_t base;
 	uint8_t clk_gen;
 	int clock_freq;
 };

 struct mss_spi_transfer {
 	uint32_t rx_len;
 	uint32_t control;
 };

 struct mss_spi_data {
 	struct spi_context ctx;
 	struct mss_spi_transfer xfer;
 };

 static inline uint32_t mss_spi_read(const struct mss_spi_config *cfg, mm_reg_t offset)
 {
 	return sys_read32(cfg->base + offset);
 }

 static inline void mss_spi_write(const struct mss_spi_config *cfg, mm_reg_t offset, uint32_t val)
 {
 	sys_write32(val, cfg->base + offset);
 }

 static inline void mss_spi_hw_tfsz_set(const struct mss_spi_config *cfg, int len)
 {
 	uint32_t control;

 	mss_spi_write(cfg, MSS_SPI_REG_FRAMESUP, (len & MSS_SPI_FRAMESUP_UP_BYTES_MSK));
 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control &= ~MSS_SPI_CONTROL_CNT_MSK;
 	control |= ((len & MSS_SPI_FRAMESUP_LO_BYTES_MSK) << MSS_SPI_CONTROL_CNT_SHF);
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
 }

 static inline void mss_spi_enable_controller(const struct mss_spi_config *cfg)
 {
 	uint32_t control;

 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control |= MSS_SPI_CONTROL_ENABLE;
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
 }

 static inline void mss_spi_disable_controller(const struct mss_spi_config *cfg)
 {
 	uint32_t control;

 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control &= ~MSS_SPI_CONTROL_ENABLE;
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
 }

 static void mss_spi_enable_ints(const struct mss_spi_config *cfg)
 {
 	uint32_t control;
 	uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT | MSS_SPI_CONTROL_TX_DATA_INT |
 			MSS_SPI_CONTROL_RX_OVER_INT | MSS_SPI_CONTROL_TX_UNDER_INT;

 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control |= mask;
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
 }

 static void mss_spi_disable_ints(const struct mss_spi_config *cfg)
 {
 	uint32_t control;
 	uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT | MSS_SPI_CONTROL_TX_DATA_INT |
 			MSS_SPI_CONTROL_RX_OVER_INT | MSS_SPI_CONTROL_TX_UNDER_INT;

 	mask = ~mask;
 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control &= ~mask;
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
 }

 static inline void mss_spi_readwr_fifo(const struct device *dev)
 {
 	const struct mss_spi_config *cfg = dev->config;
 	struct mss_spi_data *data = dev->data;
 	struct spi_context *ctx = &data->ctx;
 	struct mss_spi_transfer *xfer = &data->xfer;
 	uint32_t rx_raw = 0, rd_byte_size, tr_len;
 	uint32_t data8, transfer_idx = 0;
 	int count;

 	tr_len = spi_context_longest_current_buf(ctx);
 	count = spi_context_total_tx_len(ctx);
 	if (ctx->rx_buf) {
 		rd_byte_size = count - tr_len;
 	} else {
 		rd_byte_size = 0;
 	}
 	mss_spi_hw_tfsz_set(cfg, count);

 	mss_spi_enable_ints(cfg);
 	spi_context_update_rx(ctx, 1, xfer->rx_len);
 	while (transfer_idx < count) {
 		if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_RXFIFO_EMPTY)) {
 			rx_raw = mss_spi_read(cfg, MSS_SPI_REG_RX_DATA);
 			if (transfer_idx >= tr_len) {
 				if (spi_context_rx_buf_on(ctx)) {
 					UNALIGNED_PUT(rx_raw, (uint8_t *)ctx->rx_buf);
 					spi_context_update_rx(ctx, 1, 1);
 				}
 			}
 			++transfer_idx;
 		}

 		if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_TXFIFO_FULL)) {
 			if (spi_context_tx_buf_on(ctx)) {
 				data8 = ctx->tx_buf[0];
 				mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, data8);
 				spi_context_update_tx(ctx, 1, 1);
 			} else {
 				mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, 0x0);
 			}
 		}
 	}
 }

 static inline int mss_spi_select_slave(const struct mss_spi_config *cfg, int cs)
 {
 	uint32_t slave;
 	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

 	slave = (cs >= MSS_SPI_MIN_SLAVE && cs <= MSS_SPI_MAX_SLAVE) ? (1 << cs) : 0;
 	reg &= ~MSS_SPI_SSEL_MASK;
 	reg |= slave;

 	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);

 	return 0;
 }

 static inline void mss_spi_activate_cs(struct mss_spi_config *cfg)
 {
 	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

 	reg |= MSS_SPI_SSELOUT;
 	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
 }

 static inline void mss_spi_deactivate_cs(const struct mss_spi_config *cfg)
 {
 	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

 	reg &= ~MSS_SPI_SSELOUT;
 	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
 }

 static inline int mss_spi_clk_gen_set(const struct mss_spi_config *cfg,
 				      const struct spi_config *spi_cfg)
 {
 	uint32_t idx, clkrate, val = 0, speed;

 	if (spi_cfg->frequency > cfg->clock_freq) {
 		speed = cfg->clock_freq / 2;
 	}

 	for (idx = 1; idx < 16; idx++) {
 		clkrate = cfg->clock_freq / (2 * idx);
 		if (clkrate <= spi_cfg->frequency) {
 			val = idx;
 			break;
 		}
 	}

 	mss_spi_write(cfg, MSS_SPI_REG_CLK_GEN, val);

 	return 0;
 }

 static inline int mss_spi_hw_mode_set(const struct mss_spi_config *cfg, unsigned int mode)
 {
 	uint32_t control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);

 	/* set the mode */
 	if (mode & SPI_MODE_CPHA) {
 		control |= MSS_SPI_CONTROL_SPH;
 	} else {
 		control &= ~MSS_SPI_CONTROL_SPH;
 	}

 	if (mode & SPI_MODE_CPOL) {
 		control |= MSS_SPI_CONTROL_SPO;
 	} else {
 		control &= ~MSS_SPI_CONTROL_SPO;
 	}

 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);

 	return 0;
 }

 static void mss_spi_interrupt(const struct device *dev)
 {
 	const struct mss_spi_config *cfg = dev->config;
 	struct mss_spi_data *data = dev->data;
 	struct spi_context *ctx = &data->ctx;
 	int intfield = mss_spi_read(cfg, MSS_SPI_REG_MIS) & 0xf;

 	if (intfield == 0) {
 		return;
 	}

 	mss_spi_write(cfg, MSS_SPI_REG_INT_CLEAR, intfield);
 	spi_context_complete(ctx, dev, 0);
 }

 static int mss_spi_release(const struct device *dev, const struct spi_config *config)
 {
 	const struct mss_spi_config *cfg = dev->config;
 	struct mss_spi_data *data = dev->data;

 	mss_spi_disable_ints(cfg);

 	/* release kernel resources */
 	spi_context_unlock_unconditionally(&data->ctx);
 	mss_spi_disable_controller(cfg);

 	return 0;
 }

 static int mss_spi_configure(const struct device *dev, const struct spi_config *spi_cfg)
 {
 	const struct mss_spi_config *cfg = dev->config;
 	struct mss_spi_data *data = dev->data;
 	struct spi_context *ctx = &data->ctx;
 	struct mss_spi_transfer *xfer = &data->xfer;
 	uint32_t control;

 	if (spi_cfg->operation & (SPI_TRANSFER_LSB | SPI_OP_MODE_SLAVE | SPI_MODE_LOOP)) {
 		LOG_WRN("not supported operation\n\r");
 		return -ENOTSUP;
 	}

 	if (SPI_WORD_SIZE_GET(spi_cfg->operation) != MSS_SPI_FRAMESIZE_DEFAULT) {
 		return -ENOTSUP;
 	}

 	ctx->config = spi_cfg;
 	mss_spi_select_slave(cfg, spi_cfg->slave);
 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);

 	/*
 	 * Fill up the default values
 	 * Slave select behaviour set
 	 * Fifo depth greater than 4 frames
 	 * Methodology to calculate SPI Clock:
 	 *	0:	SPICLK = 1 / (2 CLK_GEN + 1) , CLK_GEN is from 0 to 15
 	 *	1:	SPICLK = 1 / (2 * (CLK_GEN + 1)) , CLK_GEN is from 0 to 255
 	 */

 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, xfer->control);

 	if (mss_spi_clk_gen_set(cfg, spi_cfg)) {
 		LOG_ERR("can't set clk divider\n");
 		return -EINVAL;
 	}

 	mss_spi_hw_mode_set(cfg, spi_cfg->operation);
 	mss_spi_write(cfg, MSS_SPI_REG_TXRXDF_SIZE, MSS_SPI_FRAMESIZE_DEFAULT);
 	mss_spi_enable_controller(cfg);
 	mss_spi_write(cfg, MSS_SPI_REG_COMMAND, MSS_SPI_COMMAND_FIFO_MASK);

 	return 0;
 }

 static int mss_spi_transceive(const struct device *dev, const struct spi_config *spi_cfg,
 			      const struct spi_buf_set *tx_bufs, const struct spi_buf_set *rx_bufs,
 			      bool async, spi_callback_t cb, void *userdata)
 {

 	const struct mss_spi_config *config = dev->config;
 	struct mss_spi_data *data = dev->data;
 	struct spi_context *ctx = &data->ctx;
 	struct mss_spi_transfer *xfer = &data->xfer;
 	int ret = 0;

 	spi_context_lock(ctx, async, cb, userdata, spi_cfg);

 	ret = mss_spi_configure(dev, spi_cfg);
 	if (ret) {
 		LOG_ERR("Fail to configure\n\r");
 		goto out;
 	}

 	spi_context_buffers_setup(ctx, tx_bufs, rx_bufs, 1);
 	xfer->rx_len = ctx->rx_len;
 	mss_spi_readwr_fifo(dev);
 	ret = spi_context_wait_for_completion(ctx);
 out:
 	spi_context_release(ctx, ret);
 	mss_spi_disable_ints(config);
 	mss_spi_disable_controller(config);

 	return ret;
 }

 static int mss_spi_transceive_blocking(const struct device *dev, const struct spi_config *spi_cfg,
 				       const struct spi_buf_set *tx_bufs,
 				       const struct spi_buf_set *rx_bufs)
 {

 	return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL, NULL);
 }

 #ifdef CONFIG_SPI_ASYNC
 static int mss_spi_transceive_async(const struct device *dev, const struct spi_config *spi_cfg,
 				    const struct spi_buf_set *tx_bufs,
 				    const struct spi_buf_set *rx_bufs, spi_callback_t cb,
 				    void *userdata)
 {
 	return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, cb, userdata);
 }
 #endif /* CONFIG_SPI_ASYNC */

 static int mss_spi_init(const struct device *dev)
 {
 	const struct mss_spi_config *cfg = dev->config;
 	struct mss_spi_data *data = dev->data;
 	struct mss_spi_transfer *xfer = &data->xfer;
 	int ret = 0;
 	uint32_t control = 0;

 	/* Remove SPI from Reset  */
 	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
 	control &= ~MSS_SPI_CONTROL_RESET;
 	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);

 	/* Set master mode */
 	mss_spi_disable_controller(cfg);
 	xfer->control = (MSS_SPI_CONTROL_SPS | MSS_SPI_CONTROL_BIGFIFO | MSS_SPI_CONTROL_MASTER |
 			 MSS_SPI_CONTROL_CLKMODE);

 	spi_context_unlock_unconditionally(&data->ctx);

 	return ret;
 }

 #define MICROCHIP_SPI_PM_OPS (NULL)

 static const struct spi_driver_api mss_spi_driver_api = {
 	.transceive = mss_spi_transceive_blocking,
 #ifdef CONFIG_SPI_ASYNC
 	.transceive_async = mss_spi_transceive_async,
 #endif /* CONFIG_SPI_ASYNC */
 	.release = mss_spi_release,
 };

 #define MSS_SPI_INIT(n)                                                                            \
 	static int mss_spi_init_##n(const struct device *dev)                                      \
 	{                                                                                          \
 		mss_spi_init(dev);                                                                 \
                                                                                                    \
 		IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), mss_spi_interrupt,          \
 			    DEVICE_DT_INST_GET(n), 0);                                             \
                                                                                                    \
 		irq_enable(DT_INST_IRQN(n));                                                       \
                                                                                                    \
 		return 0;                                                                          \
 	}                                                                                          \
                                                                                                    \
 	static const struct mss_spi_config mss_spi_config_##n = {                                  \
 		.base = DT_INST_REG_ADDR(n),                                                       \
 		.clock_freq = DT_INST_PROP(n, clock_frequency),                                    \
 	};                                                                                         \
                                                                                                    \
 	static struct mss_spi_data mss_spi_data_##n = {                                            \
 		SPI_CONTEXT_INIT_LOCK(mss_spi_data_##n, ctx),                                      \
 		SPI_CONTEXT_INIT_SYNC(mss_spi_data_##n, ctx),                                      \
 	};                                                                                         \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(n, mss_spi_init_##n, NULL, &mss_spi_data_##n, &mss_spi_config_##n,   \
 			      POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,                     \
 			      &mss_spi_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(MSS_SPI_INIT)
	/*
	* Copyright (c) 2022 Microchip Technology Inc.
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT microchip_mpfs_spi

	#include <zephyr/device.h>
	#include <zephyr/drivers/spi.h>
	#include <zephyr/sys/sys_io.h>
	#include <zephyr/sys/util.h>
	#include <zephyr/logging/log.h>
	#include <zephyr/irq.h>

	LOG_MODULE_REGISTER(mss_spi, CONFIG_SPI_LOG_LEVEL);

	#include "spi_context.h"

	/* MSS SPI Register offsets */
	#define MSS_SPI_REG_CONTROL (0x00)
	#define MSS_SPI_REG_TXRXDF_SIZE (0x04)
	#define MSS_SPI_REG_STATUS (0x08)
	#define MSS_SPI_REG_INT_CLEAR (0x0c)
	#define MSS_SPI_REG_RX_DATA (0x10)
	#define MSS_SPI_REG_TX_DATA (0x14)
	#define MSS_SPI_REG_CLK_GEN (0x18)
	#define MSS_SPI_REG_SS (0x1c)
	#define MSS_SPI_REG_MIS (0x20)
	#define MSS_SPI_REG_RIS (0x24)
	#define MSS_SPI_REG_CONTROL2 (0x28)
	#define MSS_SPI_REG_COMMAND (0x2c)
	#define MSS_SPI_REG_PKTSIZE (0x30)
	#define MSS_SPI_REG_CMD_SIZE (0x34)
	#define MSS_SPI_REG_HWSTATUS (0x38)
	#define MSS_SPI_REG_FRAMESUP (0x50)

	/* SPICR bit definitions */
	#define MSS_SPI_CONTROL_ENABLE BIT(0)
	#define MSS_SPI_CONTROL_MASTER BIT(1)
	#define MSS_SPI_CONTROL_PROTO_MSK BIT(2)
	#define MSS_SPI_CONTROL_PROTO_MOTO (0 << 2)
	#define MSS_SPI_CONTROL_RX_DATA_INT BIT(4)
	#define MSS_SPI_CONTROL_TX_DATA_INT BIT(5)
	#define MSS_SPI_CONTROL_RX_OVER_INT BIT(6)
	#define MSS_SPI_CONTROL_TX_UNDER_INT BIT(7)
	#define MSS_SPI_CONTROL_CNT_MSK (0xffff << 8)
	#define MSS_SPI_CONTROL_CNT_SHF (8)
	#define MSS_SPI_CONTROL_SPO BIT(24)
	#define MSS_SPI_CONTROL_SPH BIT(25)
	#define MSS_SPI_CONTROL_SPS BIT(26)
	#define MSS_SPI_CONTROL_FRAMEURUN BIT(27)
	#define MSS_SPI_CONTROL_CLKMODE BIT(28)
	#define MSS_SPI_CONTROL_BIGFIFO BIT(29)
	#define MSS_SPI_CONTROL_OENOFF BIT(30)
	#define MSS_SPI_CONTROL_RESET BIT(31)

	/* SPIFRAMESIZE bit definitions */
	#define MSS_SPI_FRAMESIZE_DEFAULT (8)

	/* SPISS bit definitions */
	#define MSS_SPI_SSEL_MASK (0xff)
	#define MSS_SPI_DIRECT (0x100)
	#define MSS_SPI_SSELOUT (0x200)
	#define MSS_SPI_MIN_SLAVE (0)
	#define MSS_SPI_MAX_SLAVE (7)

	/* SPIST bit definitions */
	#define MSS_SPI_STATUS_ACTIVE BIT(14)
	#define MSS_SPI_STATUS_SSEL BIT(13)
	#define MSS_SPI_STATUS_FRAMESTART BIT(12)
	#define MSS_SPI_STATUS_TXFIFO_EMPTY_NEXT_READ BIT(11)
	#define MSS_SPI_STATUS_TXFIFO_EMPTY BIT(10)
	#define MSS_SPI_STATUS_TXFIFO_FULL_NEXT_WRITE BIT(9)
	#define MSS_SPI_STATUS_TXFIFO_FULL BIT(8)
	#define MSS_SPI_STATUS_RXFIFO_EMPTY_NEXT_READ BIT(7)
	#define MSS_SPI_STATUS_RXFIFO_EMPTY BIT(6)
	#define MSS_SPI_STATUS_RXFIFO_FULL_NEXT_WRITE BIT(5)
	#define MSS_SPI_STATUS_RXFIFO_FULL BIT(4)
	#define MSS_SPI_STATUS_TX_UNDERRUN BIT(3)
	#define MSS_SPI_STATUS_RX_OVERFLOW BIT(2)
	#define MSS_SPI_STATUS_RXDAT_RCED BIT(1)
	#define MSS_SPI_STATUS_TXDAT_SENT BIT(0)

	/* SPIINT register defines */
	#define MSS_SPI_INT_TXDONE BIT(0)
	#define MSS_SPI_INT_RXRDY BIT(1)
	#define MSS_SPI_INT_RX_CH_OVRFLW BIT(2)
	#define MSS_SPI_INT_TX_CH_UNDRUN BIT(3)
	#define MSS_SPI_INT_CMD BIT(4)
	#define MSS_SPI_INT_SSEND BIT(5)

	/* SPICOMMAND bit definitions */
	#define MSS_SPI_COMMAND_FIFO_MASK (0xC)

	/* SPIFRAMESUP bit definitions */
	#define MSS_SPI_FRAMESUP_UP_BYTES_MSK (0xFFFF << 16)
	#define MSS_SPI_FRAMESUP_LO_BYTES_MSK (0xFFFF << 0)

	struct mss_spi_config {
	mm_reg_t base;
	uint8_t clk_gen;
	int clock_freq;
	};

	struct mss_spi_transfer {
	uint32_t rx_len;
	uint32_t control;
	};

	struct mss_spi_data {
	struct spi_context ctx;
	struct mss_spi_transfer xfer;
	};

	static inline uint32_t mss_spi_read(const struct mss_spi_config *cfg, mm_reg_t offset)
	{
	return sys_read32(cfg->base + offset);
	}

	static inline void mss_spi_write(const struct mss_spi_config *cfg, mm_reg_t offset, uint32_t val)
	{
	sys_write32(val, cfg->base + offset);
	}

	static inline void mss_spi_hw_tfsz_set(const struct mss_spi_config *cfg, int len)
	{
	uint32_t control;

	mss_spi_write(cfg, MSS_SPI_REG_FRAMESUP, (len & MSS_SPI_FRAMESUP_UP_BYTES_MSK));
	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control &= ~MSS_SPI_CONTROL_CNT_MSK;
	control \|= ((len & MSS_SPI_FRAMESUP_LO_BYTES_MSK) << MSS_SPI_CONTROL_CNT_SHF);
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
	}

	static inline void mss_spi_enable_controller(const struct mss_spi_config *cfg)
	{
	uint32_t control;

	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control \|= MSS_SPI_CONTROL_ENABLE;
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
	}

	static inline void mss_spi_disable_controller(const struct mss_spi_config *cfg)
	{
	uint32_t control;

	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control &= ~MSS_SPI_CONTROL_ENABLE;
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
	}

	static void mss_spi_enable_ints(const struct mss_spi_config *cfg)
	{
	uint32_t control;
	uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT \| MSS_SPI_CONTROL_TX_DATA_INT \|
	MSS_SPI_CONTROL_RX_OVER_INT \| MSS_SPI_CONTROL_TX_UNDER_INT;

	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control \|= mask;
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
	}

	static void mss_spi_disable_ints(const struct mss_spi_config *cfg)
	{
	uint32_t control;
	uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT \| MSS_SPI_CONTROL_TX_DATA_INT \|
	MSS_SPI_CONTROL_RX_OVER_INT \| MSS_SPI_CONTROL_TX_UNDER_INT;

	mask = ~mask;
	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control &= ~mask;
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
	}

	static inline void mss_spi_readwr_fifo(const struct device *dev)
	{
	const struct mss_spi_config *cfg = dev->config;
	struct mss_spi_data *data = dev->data;
	struct spi_context *ctx = &data->ctx;
	struct mss_spi_transfer *xfer = &data->xfer;
	uint32_t rx_raw = 0, rd_byte_size, tr_len;
	uint32_t data8, transfer_idx = 0;
	int count;

	tr_len = spi_context_longest_current_buf(ctx);
	count = spi_context_total_tx_len(ctx);
	if (ctx->rx_buf) {
	rd_byte_size = count - tr_len;
	} else {
	rd_byte_size = 0;
	}
	mss_spi_hw_tfsz_set(cfg, count);

	mss_spi_enable_ints(cfg);
	spi_context_update_rx(ctx, 1, xfer->rx_len);
	while (transfer_idx < count) {
	if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_RXFIFO_EMPTY)) {
	rx_raw = mss_spi_read(cfg, MSS_SPI_REG_RX_DATA);
	if (transfer_idx >= tr_len) {
	if (spi_context_rx_buf_on(ctx)) {
	UNALIGNED_PUT(rx_raw, (uint8_t *)ctx->rx_buf);
	spi_context_update_rx(ctx, 1, 1);
	}
	}
	++transfer_idx;
	}

	if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_TXFIFO_FULL)) {
	if (spi_context_tx_buf_on(ctx)) {
	data8 = ctx->tx_buf[0];
	mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, data8);
	spi_context_update_tx(ctx, 1, 1);
	} else {
	mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, 0x0);
	}
	}
	}
	}

	static inline int mss_spi_select_slave(const struct mss_spi_config *cfg, int cs)
	{
	uint32_t slave;
	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

	slave = (cs >= MSS_SPI_MIN_SLAVE && cs <= MSS_SPI_MAX_SLAVE) ? (1 << cs) : 0;
	reg &= ~MSS_SPI_SSEL_MASK;
	reg \|= slave;

	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);

	return 0;
	}

	static inline void mss_spi_activate_cs(struct mss_spi_config *cfg)
	{
	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

	reg \|= MSS_SPI_SSELOUT;
	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
	}

	static inline void mss_spi_deactivate_cs(const struct mss_spi_config *cfg)
	{
	uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);

	reg &= ~MSS_SPI_SSELOUT;
	mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
	}

	static inline int mss_spi_clk_gen_set(const struct mss_spi_config *cfg,
	const struct spi_config *spi_cfg)
	{
	uint32_t idx, clkrate, val = 0, speed;

	if (spi_cfg->frequency > cfg->clock_freq) {
	speed = cfg->clock_freq / 2;
	}

	for (idx = 1; idx < 16; idx++) {
	clkrate = cfg->clock_freq / (2 * idx);
	if (clkrate <= spi_cfg->frequency) {
	val = idx;
	break;
	}
	}

	mss_spi_write(cfg, MSS_SPI_REG_CLK_GEN, val);

	return 0;
	}

	static inline int mss_spi_hw_mode_set(const struct mss_spi_config *cfg, unsigned int mode)
	{
	uint32_t control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);

	/* set the mode */
	if (mode & SPI_MODE_CPHA) {
	control \|= MSS_SPI_CONTROL_SPH;
	} else {
	control &= ~MSS_SPI_CONTROL_SPH;
	}

	if (mode & SPI_MODE_CPOL) {
	control \|= MSS_SPI_CONTROL_SPO;
	} else {
	control &= ~MSS_SPI_CONTROL_SPO;
	}

	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);

	return 0;
	}

	static void mss_spi_interrupt(const struct device *dev)
	{
	const struct mss_spi_config *cfg = dev->config;
	struct mss_spi_data *data = dev->data;
	struct spi_context *ctx = &data->ctx;
	int intfield = mss_spi_read(cfg, MSS_SPI_REG_MIS) & 0xf;

	if (intfield == 0) {
	return;
	}

	mss_spi_write(cfg, MSS_SPI_REG_INT_CLEAR, intfield);
	spi_context_complete(ctx, dev, 0);
	}

	static int mss_spi_release(const struct device dev, const struct spi_config config)
	{
	const struct mss_spi_config *cfg = dev->config;
	struct mss_spi_data *data = dev->data;

	mss_spi_disable_ints(cfg);

	/* release kernel resources */
	spi_context_unlock_unconditionally(&data->ctx);
	mss_spi_disable_controller(cfg);

	return 0;
	}

	static int mss_spi_configure(const struct device dev, const struct spi_config spi_cfg)
	{
	const struct mss_spi_config *cfg = dev->config;
	struct mss_spi_data *data = dev->data;
	struct spi_context *ctx = &data->ctx;
	struct mss_spi_transfer *xfer = &data->xfer;
	uint32_t control;

	if (spi_cfg->operation & (SPI_TRANSFER_LSB \| SPI_OP_MODE_SLAVE \| SPI_MODE_LOOP)) {
	LOG_WRN("not supported operation\n\r");
	return -ENOTSUP;
	}

	if (SPI_WORD_SIZE_GET(spi_cfg->operation) != MSS_SPI_FRAMESIZE_DEFAULT) {
	return -ENOTSUP;
	}

	ctx->config = spi_cfg;
	mss_spi_select_slave(cfg, spi_cfg->slave);
	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);

	/*
	* Fill up the default values
	* Slave select behaviour set
	* Fifo depth greater than 4 frames
	* Methodology to calculate SPI Clock:
	* 0: SPICLK = 1 / (2 CLK_GEN + 1) , CLK_GEN is from 0 to 15
	* 1: SPICLK = 1 / (2 * (CLK_GEN + 1)) , CLK_GEN is from 0 to 255
	*/

	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, xfer->control);

	if (mss_spi_clk_gen_set(cfg, spi_cfg)) {
	LOG_ERR("can't set clk divider\n");
	return -EINVAL;
	}

	mss_spi_hw_mode_set(cfg, spi_cfg->operation);
	mss_spi_write(cfg, MSS_SPI_REG_TXRXDF_SIZE, MSS_SPI_FRAMESIZE_DEFAULT);
	mss_spi_enable_controller(cfg);
	mss_spi_write(cfg, MSS_SPI_REG_COMMAND, MSS_SPI_COMMAND_FIFO_MASK);

	return 0;
	}

	static int mss_spi_transceive(const struct device dev, const struct spi_config spi_cfg,
	const struct spi_buf_set tx_bufs, const struct spi_buf_set rx_bufs,
	bool async, spi_callback_t cb, void *userdata)
	{

	const struct mss_spi_config *config = dev->config;
	struct mss_spi_data *data = dev->data;
	struct spi_context *ctx = &data->ctx;
	struct mss_spi_transfer *xfer = &data->xfer;
	int ret = 0;

	spi_context_lock(ctx, async, cb, userdata, spi_cfg);

	ret = mss_spi_configure(dev, spi_cfg);
	if (ret) {
	LOG_ERR("Fail to configure\n\r");
	goto out;
	}

	spi_context_buffers_setup(ctx, tx_bufs, rx_bufs, 1);
	xfer->rx_len = ctx->rx_len;
	mss_spi_readwr_fifo(dev);
	ret = spi_context_wait_for_completion(ctx);
	out:
	spi_context_release(ctx, ret);
	mss_spi_disable_ints(config);
	mss_spi_disable_controller(config);

	return ret;
	}

	static int mss_spi_transceive_blocking(const struct device dev, const struct spi_config spi_cfg,
	const struct spi_buf_set *tx_bufs,
	const struct spi_buf_set *rx_bufs)
	{

	return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL, NULL);
	}

	#ifdef CONFIG_SPI_ASYNC
	static int mss_spi_transceive_async(const struct device dev, const struct spi_config spi_cfg,
	const struct spi_buf_set *tx_bufs,
	const struct spi_buf_set *rx_bufs, spi_callback_t cb,
	void *userdata)
	{
	return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, cb, userdata);
	}
	#endif /* CONFIG_SPI_ASYNC */

	static int mss_spi_init(const struct device *dev)
	{
	const struct mss_spi_config *cfg = dev->config;
	struct mss_spi_data *data = dev->data;
	struct mss_spi_transfer *xfer = &data->xfer;
	int ret = 0;
	uint32_t control = 0;

	/* Remove SPI from Reset */
	control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
	control &= ~MSS_SPI_CONTROL_RESET;
	mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);

	/* Set master mode */
	mss_spi_disable_controller(cfg);
	xfer->control = (MSS_SPI_CONTROL_SPS \| MSS_SPI_CONTROL_BIGFIFO \| MSS_SPI_CONTROL_MASTER \|
	MSS_SPI_CONTROL_CLKMODE);

	spi_context_unlock_unconditionally(&data->ctx);

	return ret;
	}

	#define MICROCHIP_SPI_PM_OPS (NULL)

	static const struct spi_driver_api mss_spi_driver_api = {
	.transceive = mss_spi_transceive_blocking,
	#ifdef CONFIG_SPI_ASYNC
	.transceive_async = mss_spi_transceive_async,
	#endif /* CONFIG_SPI_ASYNC */
	.release = mss_spi_release,
	};

	#define MSS_SPI_INIT(n) \
	static int mss_spi_init_##n(const struct device *dev) \
	{ \
	mss_spi_init(dev); \
	\
	IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), mss_spi_interrupt, \
	DEVICE_DT_INST_GET(n), 0); \
	\
	irq_enable(DT_INST_IRQN(n)); \
	\
	return 0; \
	} \
	\
	static const struct mss_spi_config mss_spi_config_##n = { \
	.base = DT_INST_REG_ADDR(n), \
	.clock_freq = DT_INST_PROP(n, clock_frequency), \
	}; \
	\
	static struct mss_spi_data mss_spi_data_##n = { \
	SPI_CONTEXT_INIT_LOCK(mss_spi_data_##n, ctx), \
	SPI_CONTEXT_INIT_SYNC(mss_spi_data_##n, ctx), \
	}; \
	\
	DEVICE_DT_INST_DEFINE(n, mss_spi_init_##n, NULL, &mss_spi_data_##n, &mss_spi_config_##n, \
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
	&mss_spi_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(MSS_SPI_INIT)