4  * SPDX-License-Identifier: Apache-2.0
18 #include "i2c-priv.h"
22 #define I2C_REG(config, reg)	((mem_addr_t) ((config)->base + reg))
32 /* Transmit on write, receive on read */
36 /* Command on write, status on read */
73 	const struct i2c_sifive_cfg *config = dev->config;  in i2c_sifive_busy()
82 	const struct i2c_sifive_cfg *config = dev->config;  in i2c_sifive_send_addr()
83 	uint8_t command = 0U;  in i2c_sifive_send_addr()  local
89 	/* Set transmit register to address with read/write flag */  in i2c_sifive_send_addr()
93 	command = SF_CMD_WRITE | SF_CMD_START;  in i2c_sifive_send_addr()
95 	/* Write the command register to start the transfer */  in i2c_sifive_send_addr()
96 	sys_write8(command, I2C_REG(config, REG_COMMAND));  in i2c_sifive_send_addr()
103 		return -EIO;  in i2c_sifive_send_addr()
113 	const struct i2c_sifive_cfg *config = dev->config;  in i2c_sifive_write_msg()
115 	uint8_t command = 0U;  in i2c_sifive_write_msg()  local
119 		LOG_ERR("I2C failed to write message\n");  in i2c_sifive_write_msg()
123 	for (uint32_t i = 0; i < msg->len; i++) {  in i2c_sifive_write_msg()
129 		sys_write8((msg->buf)[i], I2C_REG(config, REG_TRANSMIT));  in i2c_sifive_write_msg()
131 		/* Generate command byte */  in i2c_sifive_write_msg()
132 		command = SF_CMD_WRITE;  in i2c_sifive_write_msg()
135 		if (i == (msg->len - 1)) {  in i2c_sifive_write_msg()
137 			if (msg->flags & I2C_MSG_STOP) {  in i2c_sifive_write_msg()
138 				command |= SF_CMD_STOP;  in i2c_sifive_write_msg()
142 		/* Write command reg */  in i2c_sifive_write_msg()
143 		sys_write8(command, I2C_REG(config, REG_COMMAND));  in i2c_sifive_write_msg()
151 			return -EIO;  in i2c_sifive_write_msg()
162 	const struct i2c_sifive_cfg *config = dev->config;  in i2c_sifive_read_msg()
163 	uint8_t command = 0U;  in i2c_sifive_read_msg()  local
170 	for (int i = 0; i < msg->len; i++) {  in i2c_sifive_read_msg()
171 		/* Generate command byte */  in i2c_sifive_read_msg()
172 		command = SF_CMD_READ;  in i2c_sifive_read_msg()
175 		if (i == (msg->len - 1)) {  in i2c_sifive_read_msg()
177 			command |= SF_CMD_ACK;  in i2c_sifive_read_msg()
180 			if (msg->flags & I2C_MSG_STOP) {  in i2c_sifive_read_msg()
181 				command |= SF_CMD_STOP;  in i2c_sifive_read_msg()
185 		/* Write command reg */  in i2c_sifive_read_msg()
186 		sys_write8(command, I2C_REG(config, REG_COMMAND));  in i2c_sifive_read_msg()
193 		(msg->buf)[i] = sys_read8(I2C_REG(config, REG_RECEIVE));  in i2c_sifive_read_msg()
210 		return -EINVAL;  in i2c_sifive_configure()
212 	config = dev->config;  in i2c_sifive_configure()
215 		return -EINVAL;  in i2c_sifive_configure()
234 		return -ENOTSUP;  in i2c_sifive_configure()
238 	prescale = (config->f_sys / (i2c_speed * 5U)) - 1;  in i2c_sifive_configure()
248 		return -ENOTSUP;  in i2c_sifive_configure()
252 	 * Driver does not support 10-bit addressing. This can be added  in i2c_sifive_configure()
256 		LOG_ERR("I2C driver does not support 10-bit addresses");  in i2c_sifive_configure()
257 		return -ENOTSUP;  in i2c_sifive_configure()
276 		return -EINVAL;  in i2c_sifive_transfer()
278 	if (dev->config == NULL) {  in i2c_sifive_transfer()
280 		return -EINVAL;  in i2c_sifive_transfer()
283 		return -EINVAL;  in i2c_sifive_transfer()
304 	const struct i2c_sifive_cfg *config = dev->config;  in i2c_sifive_init()
308 	dev_config = (I2C_MODE_CONTROLLER | i2c_map_dt_bitrate(config->f_bus));  in i2c_sifive_init()