2  * Copyright (c) 2021 Marc Reilly - Creative Product Design
4  * SPDX-License-Identifier: Apache-2.0
35 	if (config->operation & SPI_OP_MODE_SLAVE) {  in spi_bitbang_configure()
36 		LOG_ERR("Slave mode not supported");  in spi_bitbang_configure()
37 		return -ENOTSUP;  in spi_bitbang_configure()
40 	if (config->operation & (SPI_LINES_DUAL | SPI_LINES_QUAD | SPI_LINES_OCTAL)) {  in spi_bitbang_configure()
42 		return -ENOTSUP;  in spi_bitbang_configure()
45 	const int bits = SPI_WORD_SIZE_GET(config->operation);  in spi_bitbang_configure()
49 		return -ENOTSUP;  in spi_bitbang_configure()
52 	data->bits = bits;  in spi_bitbang_configure()
53 	data->dfs = ((data->bits - 1) / 8) + 1;  in spi_bitbang_configure()
54 	if (config->frequency > 0) {  in spi_bitbang_configure()
58 		data->wait_us = (1000000ul * 2000ul / config->frequency) / 2000ul;  in spi_bitbang_configure()
59 		data->wait_us /= 2;  in spi_bitbang_configure()
61 		data->wait_us = 8 / 2; /* 125 kHz */  in spi_bitbang_configure()
64 	data->ctx.config = config;  in spi_bitbang_configure()
74 	const struct spi_bitbang_config *info = dev->config;  in spi_bitbang_transceive()
75 	struct spi_bitbang_data *data = dev->data;  in spi_bitbang_transceive()
76 	struct spi_context *ctx = &data->ctx;  in spi_bitbang_transceive()
87 	if (spi_cfg->operation & SPI_HALF_DUPLEX) {  in spi_bitbang_transceive()
88 		if (!info->mosi_gpio.port) {  in spi_bitbang_transceive()
89 			LOG_ERR("No MOSI pin specified in half duplex mode");  in spi_bitbang_transceive()
90 			return -EINVAL;  in spi_bitbang_transceive()
94 			LOG_ERR("Both RX and TX specified in half duplex mode");  in spi_bitbang_transceive()
95 			return -EINVAL;  in spi_bitbang_transceive()
97 			/* TX mode */  in spi_bitbang_transceive()
98 			mosi = &info->mosi_gpio;  in spi_bitbang_transceive()
100 			/* RX mode */  in spi_bitbang_transceive()
102 			miso = &info->mosi_gpio;  in spi_bitbang_transceive()
105 		if (info->mosi_gpio.port) {  in spi_bitbang_transceive()
106 			mosi = &info->mosi_gpio;  in spi_bitbang_transceive()
109 		if (info->miso_gpio.port) {  in spi_bitbang_transceive()
110 			miso = &info->miso_gpio;  in spi_bitbang_transceive()
114 	if (info->mosi_gpio.port) {  in spi_bitbang_transceive()
115 		rc = gpio_pin_configure_dt(&info->mosi_gpio, mosi_flags);  in spi_bitbang_transceive()
122 	spi_context_buffers_setup(ctx, tx_bufs, rx_bufs, data->dfs);  in spi_bitbang_transceive()
129 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL) {  in spi_bitbang_transceive()
132 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA) {  in spi_bitbang_transceive()
135 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_LOOP) {  in spi_bitbang_transceive()
138 	if (spi_cfg->operation & SPI_TRANSFER_LSB) {  in spi_bitbang_transceive()
143 	gpio_pin_set_dt(&info->clk_gpio, clock_state);  in spi_bitbang_transceive()
147 	const uint32_t wait_us = data->wait_us;  in spi_bitbang_transceive()
152 		if (ctx->tx_len) {  in spi_bitbang_transceive()
153 			switch (data->dfs) {  in spi_bitbang_transceive()
155 				w = *(uint16_t *)(ctx->tx_buf);  in spi_bitbang_transceive()
158 				w = *(uint8_t *)(ctx->tx_buf);  in spi_bitbang_transceive()
172 		while (i < data->bits) {  in spi_bitbang_transceive()
173 			const int shift = lsb ? i : (data->bits - 1 - i);  in spi_bitbang_transceive()
190 			gpio_pin_set_dt(&info->clk_gpio, !clock_state);  in spi_bitbang_transceive()
199 			gpio_pin_set_dt(&info->clk_gpio, clock_state);  in spi_bitbang_transceive()
211 			switch (data->dfs) {  in spi_bitbang_transceive()
213 				*(uint16_t *)(ctx->rx_buf) = r;  in spi_bitbang_transceive()
216 				*(uint8_t *)(ctx->rx_buf) = r;  in spi_bitbang_transceive()
223 		spi_context_update_tx(ctx, data->dfs, 1);  in spi_bitbang_transceive()
224 		spi_context_update_rx(ctx, data->dfs, 1);  in spi_bitbang_transceive()
242 	return -ENOTSUP;  in spi_bitbang_transceive_async()
249 	struct spi_bitbang_data *data = dev->data;  in spi_bitbang_release()
250 	struct spi_context *ctx = &data->ctx;  in spi_bitbang_release()
269 	const struct spi_bitbang_config *config = dev->config;  in spi_bitbang_init()
270 	struct spi_bitbang_data *data = dev->data;  in spi_bitbang_init()
273 	if (!gpio_is_ready_dt(&config->clk_gpio)) {  in spi_bitbang_init()
275 		return -ENODEV;  in spi_bitbang_init()
277 	rc = gpio_pin_configure_dt(&config->clk_gpio, GPIO_OUTPUT_INACTIVE);  in spi_bitbang_init()
283 	if (config->mosi_gpio.port != NULL) {  in spi_bitbang_init()
284 		if (!gpio_is_ready_dt(&config->mosi_gpio)) {  in spi_bitbang_init()
286 			return -ENODEV;  in spi_bitbang_init()
288 		rc = gpio_pin_configure_dt(&config->mosi_gpio,  in spi_bitbang_init()
296 	if (config->miso_gpio.port != NULL) {  in spi_bitbang_init()
297 		if (!gpio_is_ready_dt(&config->miso_gpio)) {  in spi_bitbang_init()
299 			return -ENODEV;  in spi_bitbang_init()
303 		rc = gpio_pin_configure_dt(&config->miso_gpio, GPIO_INPUT);  in spi_bitbang_init()
310 	rc = spi_context_cs_configure_all(&data->ctx);  in spi_bitbang_init()
319 #define SPI_BITBANG_INIT(inst)						\  argument
320 	static struct spi_bitbang_config spi_bitbang_config_##inst = {	\
321 		.clk_gpio = GPIO_DT_SPEC_INST_GET(inst, clk_gpios),	\
322 		.mosi_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, mosi_gpios, {0}),	\
323 		.miso_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, miso_gpios, {0}),	\
326 	static struct spi_bitbang_data spi_bitbang_data_##inst = {	\
327 		SPI_CONTEXT_INIT_LOCK(spi_bitbang_data_##inst, ctx),	\
328 		SPI_CONTEXT_INIT_SYNC(spi_bitbang_data_##inst, ctx),	\
329 		SPI_CONTEXT_CS_GPIOS_INITIALIZE(DT_DRV_INST(inst), ctx)	\
332 	SPI_DEVICE_DT_INST_DEFINE(inst,					\
335 			    &spi_bitbang_data_##inst,			\
336 			    &spi_bitbang_config_##inst,			\