2  * Copyright (c) 2021 Marc Reilly - Creative Product Design
4  * SPDX-License-Identifier: Apache-2.0
34 	if (config->operation & SPI_OP_MODE_SLAVE) {  in spi_bitbang_configure()
36 		return -ENOTSUP;  in spi_bitbang_configure()
39 	if (config->operation & (SPI_TRANSFER_LSB | SPI_LINES_DUAL  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()
98 			mosi = &info->mosi_gpio;  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()
128 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL) {  in spi_bitbang_transceive()
131 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA) {  in spi_bitbang_transceive()
134 	if (SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_LOOP) {  in spi_bitbang_transceive()
139 	gpio_pin_set_dt(&info->clk_gpio, clock_state);  in spi_bitbang_transceive()
143 	const uint32_t wait_us = data->wait_us;  in spi_bitbang_transceive()
148 		if (ctx->tx_len) {  in spi_bitbang_transceive()
149 			switch (data->dfs) {  in spi_bitbang_transceive()
151 				w = *(uint16_t *)(ctx->tx_buf);  in spi_bitbang_transceive()
154 				w = *(uint8_t *)(ctx->tx_buf);  in spi_bitbang_transceive()
159 		int shift = data->bits - 1;  in spi_bitbang_transceive()
181 			gpio_pin_set_dt(&info->clk_gpio, !clock_state);  in spi_bitbang_transceive()
190 			gpio_pin_set_dt(&info->clk_gpio, clock_state);  in spi_bitbang_transceive()
202 			--shift;  in spi_bitbang_transceive()
206 			switch (data->dfs) {  in spi_bitbang_transceive()
208 				*(uint16_t *)(ctx->rx_buf) = r;  in spi_bitbang_transceive()
211 				*(uint8_t *)(ctx->rx_buf) = r;  in spi_bitbang_transceive()
218 		spi_context_update_tx(ctx, data->dfs, 1);  in spi_bitbang_transceive()
219 		spi_context_update_rx(ctx, data->dfs, 1);  in spi_bitbang_transceive()
236 	return -ENOTSUP;  in spi_bitbang_transceive_async()
243 	struct spi_bitbang_data *data = dev->data;  in spi_bitbang_release()
244 	struct spi_context *ctx = &data->ctx;  in spi_bitbang_release()
260 	const struct spi_bitbang_config *config = dev->config;  in spi_bitbang_init()
261 	struct spi_bitbang_data *data = dev->data;  in spi_bitbang_init()
264 	if (!gpio_is_ready_dt(&config->clk_gpio)) {  in spi_bitbang_init()
266 		return -ENODEV;  in spi_bitbang_init()
268 	rc = gpio_pin_configure_dt(&config->clk_gpio, GPIO_OUTPUT_INACTIVE);  in spi_bitbang_init()
274 	if (config->mosi_gpio.port != NULL) {  in spi_bitbang_init()
275 		if (!gpio_is_ready_dt(&config->mosi_gpio)) {  in spi_bitbang_init()
277 			return -ENODEV;  in spi_bitbang_init()
279 		rc = gpio_pin_configure_dt(&config->mosi_gpio,  in spi_bitbang_init()
287 	if (config->miso_gpio.port != NULL) {  in spi_bitbang_init()
288 		if (!gpio_is_ready_dt(&config->miso_gpio)) {  in spi_bitbang_init()
290 			return -ENODEV;  in spi_bitbang_init()
294 		rc = gpio_pin_configure_dt(&config->miso_gpio, GPIO_INPUT);  in spi_bitbang_init()
301 	rc = spi_context_cs_configure_all(&data->ctx);  in spi_bitbang_init()