5  * SPDX-License-Identifier: Apache-2.0
13  * Only I2C Master Mode with 7 bit addressing is currently supported.
32 #include "i2c-priv.h"
34 /** I2C bus speed [Hz] in Standard Mode */
36 /** I2C bus speed [Hz] in Fast Mode */
38 /** I2C bus speed [Hz] in High Speed Mode */
72 static int i2c_clk_set(Twihs *const twihs, uint32_t speed)  in i2c_clk_set()  argument
82 		cl_div =   ((SOC_ATMEL_SAM_MCK_FREQ_HZ / (speed * 2U)) - 3)  in i2c_clk_set()
94 		return -EIO;  in i2c_clk_set()
98 	twihs->TWIHS_CWGR = TWIHS_CWGR_CLDIV(cl_div) | TWIHS_CWGR_CHDIV(cl_div)  in i2c_clk_set()
106 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;  in i2c_sam_twihs_configure()
107 	Twihs *const twihs = dev_cfg->regs;  in i2c_sam_twihs_configure()
112 		LOG_ERR("Master Mode is not enabled");  in i2c_sam_twihs_configure()
113 		return -EIO;  in i2c_sam_twihs_configure()
117 		LOG_ERR("I2C 10-bit addressing is currently not supported");  in i2c_sam_twihs_configure()
119 		return -EIO;  in i2c_sam_twihs_configure()
131 		LOG_ERR("Unsupported I2C speed value");  in i2c_sam_twihs_configure()
132 		return -EIO;  in i2c_sam_twihs_configure()
141 	/* Disable Slave Mode */  in i2c_sam_twihs_configure()
142 	twihs->TWIHS_CR = TWIHS_CR_SVDIS;  in i2c_sam_twihs_configure()
144 	/* Enable Master Mode */  in i2c_sam_twihs_configure()
145 	twihs->TWIHS_CR = TWIHS_CR_MSEN;  in i2c_sam_twihs_configure()
154 	twihs->TWIHS_MMR = TWIHS_MMR_DADR(daddr);  in write_msg_start()
157 	twihs->TWIHS_THR = msg->buf[msg->idx++];  in write_msg_start()
159 	/* Enable Transmit Ready and Transmission Completed interrupts */  in write_msg_start()
160 	twihs->TWIHS_IER = TWIHS_IER_TXRDY | TWIHS_IER_TXCOMP | TWIHS_IER_NACK;  in write_msg_start()
169 	twihs->TWIHS_MMR = TWIHS_MMR_MREAD | TWIHS_MMR_DADR(daddr);  in read_msg_start()
171 	/* Enable Receive Ready and Transmission Completed interrupts */  in read_msg_start()
172 	twihs->TWIHS_IER = TWIHS_IER_RXRDY | TWIHS_IER_TXCOMP | TWIHS_IER_NACK;  in read_msg_start()
175 	twihs_cr_stop = (msg->len == 1U) ? TWIHS_CR_STOP : 0;  in read_msg_start()
177 	twihs->TWIHS_CR = TWIHS_CR_START | twihs_cr_stop;  in read_msg_start()
184 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;  in i2c_sam_twihs_transfer()
185 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;  in i2c_sam_twihs_transfer()
186 	Twihs *const twihs = dev_cfg->regs;  in i2c_sam_twihs_transfer()
194 	(void)twihs->TWIHS_SR;  in i2c_sam_twihs_transfer()
197 	twihs->TWIHS_IADR = 0;  in i2c_sam_twihs_transfer()
200 		dev_data->msg.buf = msgs[i].buf;  in i2c_sam_twihs_transfer()
201 		dev_data->msg.len = msgs[i].len;  in i2c_sam_twihs_transfer()
202 		dev_data->msg.idx = 0U;  in i2c_sam_twihs_transfer()
203 		dev_data->msg.twihs_sr = 0U;  in i2c_sam_twihs_transfer()
204 		dev_data->msg.flags = msgs[i].flags;  in i2c_sam_twihs_transfer()
206 			read_msg_start(twihs, &dev_data->msg, addr);  in i2c_sam_twihs_transfer()
208 			write_msg_start(twihs, &dev_data->msg, addr);  in i2c_sam_twihs_transfer()
211 		k_sem_take(&dev_data->sem, K_FOREVER);  in i2c_sam_twihs_transfer()
213 		if (dev_data->msg.twihs_sr > 0) {  in i2c_sam_twihs_transfer()
215 			return -EIO;  in i2c_sam_twihs_transfer()
224 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;  in i2c_sam_twihs_isr()
225 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;  in i2c_sam_twihs_isr()
226 	Twihs *const twihs = dev_cfg->regs;  in i2c_sam_twihs_isr()
227 	struct twihs_msg *msg = &dev_data->msg;  in i2c_sam_twihs_isr()
231 	isr_status = twihs->TWIHS_SR & twihs->TWIHS_IMR;  in i2c_sam_twihs_isr()
235 		msg->twihs_sr = isr_status;  in i2c_sam_twihs_isr()
242 		msg->buf[msg->idx++] = twihs->TWIHS_RHR;  in i2c_sam_twihs_isr()
244 		if (msg->idx == msg->len - 1U) {  in i2c_sam_twihs_isr()
246 			twihs->TWIHS_CR = TWIHS_CR_STOP;  in i2c_sam_twihs_isr()
252 		if (msg->idx == msg->len) {  in i2c_sam_twihs_isr()
253 			if (msg->flags & I2C_MSG_STOP) {  in i2c_sam_twihs_isr()
255 				twihs->TWIHS_CR = TWIHS_CR_STOP;  in i2c_sam_twihs_isr()
257 				twihs->TWIHS_IDR = TWIHS_IDR_TXRDY;  in i2c_sam_twihs_isr()
263 			twihs->TWIHS_THR = msg->buf[msg->idx++];  in i2c_sam_twihs_isr()
276 	twihs->TWIHS_IDR = twihs->TWIHS_IMR;  in i2c_sam_twihs_isr()
278 	k_sem_give(&dev_data->sem);  in i2c_sam_twihs_isr()
283 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;  in i2c_sam_twihs_initialize()
284 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;  in i2c_sam_twihs_initialize()
285 	Twihs *const twihs = dev_cfg->regs;  in i2c_sam_twihs_initialize()
290 	dev_cfg->irq_config();  in i2c_sam_twihs_initialize()
293 	k_sem_init(&dev_data->sem, 0, 1);  in i2c_sam_twihs_initialize()
296 	ret = pinctrl_apply_state(dev_cfg->pcfg, PINCTRL_STATE_DEFAULT);  in i2c_sam_twihs_initialize()
301 	/* Enable TWIHS clock in PMC */  in i2c_sam_twihs_initialize()
303 			       (clock_control_subsys_t)&dev_cfg->clock_cfg);  in i2c_sam_twihs_initialize()
306 	twihs->TWIHS_CR = TWIHS_CR_SWRST;  in i2c_sam_twihs_initialize()
308 	bitrate_cfg = i2c_map_dt_bitrate(dev_cfg->bitrate);  in i2c_sam_twihs_initialize()
312 		LOG_ERR("Failed to initialize %s device", dev->name);  in i2c_sam_twihs_initialize()
316 	/* Enable module's IRQ */  in i2c_sam_twihs_initialize()
317 	irq_enable(dev_cfg->irq_id);  in i2c_sam_twihs_initialize()
319 	LOG_INF("Device %s initialized", dev->name);  in i2c_sam_twihs_initialize()