blob: d140c534cedbc0a143f28fb8f052350e91d37e30 [file] [log] [blame] [edit]
/*
* Copyright (c) 2021 Telink Semiconductor
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT telink_b91_i2c
#include "i2c.h"
#include "clock.h"
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(i2c_telink);
#include <zephyr/drivers/i2c.h>
#include "i2c-priv.h"
#include <zephyr/drivers/pinctrl.h>
/* I2C configuration structure */
struct i2c_b91_cfg {
uint32_t bitrate;
const struct pinctrl_dev_config *pcfg;
};
/* I2C data structure */
struct i2c_b91_data {
struct k_sem mutex;
};
/* API implementation: configure */
static int i2c_b91_configure(const struct device *dev, uint32_t dev_config)
{
ARG_UNUSED(dev);
uint32_t i2c_speed = 0u;
/* check address size */
if (dev_config & I2C_ADDR_10_BITS) {
LOG_ERR("10-bits address is not supported");
return -ENOTSUP;
}
/* check I2C Master/Slave configuration */
if (!(dev_config & I2C_MODE_CONTROLLER)) {
LOG_ERR("I2C slave is not implemented");
return -ENOTSUP;
}
/* check i2c speed */
switch (I2C_SPEED_GET(dev_config)) {
case I2C_SPEED_STANDARD:
i2c_speed = 100000u;
break;
case I2C_SPEED_FAST:
i2c_speed = 400000U;
break;
case I2C_SPEED_FAST_PLUS:
case I2C_SPEED_HIGH:
case I2C_SPEED_ULTRA:
default:
LOG_ERR("Unsupported I2C speed requested");
return -ENOTSUP;
}
/* init i2c */
i2c_master_init();
i2c_set_master_clk((unsigned char)(sys_clk.pclk * 1000 * 1000 / (4 * i2c_speed)));
return 0;
}
/* API implementation: transfer */
static int i2c_b91_transfer(const struct device *dev,
struct i2c_msg *msgs,
uint8_t num_msgs,
uint16_t addr)
{
int status = 0;
uint8_t send_stop = 0;
struct i2c_b91_data *data = dev->data;
/* get the mutex */
k_sem_take(&data->mutex, K_FOREVER);
/* loop through all messages */
for (int i = 0; i < num_msgs; i++) {
/* check addr size */
if (msgs[i].flags & I2C_MSG_ADDR_10_BITS) {
LOG_ERR("10-bits address is not supported");
k_sem_give(&data->mutex);
return -ENOTSUP;
}
/* config stop bit */
send_stop = msgs[i].flags & I2C_MSG_STOP ? 1 : 0;
i2c_master_send_stop(send_stop);
/* transfer data */
if (msgs[i].flags & I2C_MSG_READ) {
status = i2c_master_read(addr, msgs[i].buf, msgs[i].len);
} else {
status = i2c_master_write(addr, msgs[i].buf, msgs[i].len);
}
/* check status */
if (!status) {
LOG_ERR("Failed to transfer I2C messages\n");
k_sem_give(&data->mutex);
return -EIO;
}
}
/* release the mutex */
k_sem_give(&data->mutex);
return 0;
};
/* API implementation: init */
static int i2c_b91_init(const struct device *dev)
{
int status = 0;
const struct i2c_b91_cfg *cfg = dev->config;
struct i2c_b91_data *data = dev->data;
uint32_t dev_config = (I2C_MODE_CONTROLLER | i2c_map_dt_bitrate(cfg->bitrate));
/* init mutex */
k_sem_init(&data->mutex, 1, 1);
/* config i2c on startup */
status = i2c_b91_configure(dev, dev_config);
if (status != 0) {
LOG_ERR("Failed to configure I2C on init");
return status;
}
/* configure pins */
status = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (status < 0) {
LOG_ERR("Failed to configure I2C pins");
return status;
}
return 0;
}
/* I2C driver APIs structure */
static const struct i2c_driver_api i2c_b91_api = {
.configure = i2c_b91_configure,
.transfer = i2c_b91_transfer,
};
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) <= 1,
"unsupported I2C instance");
/* I2C driver registration */
#define I2C_B91_INIT(inst) \
\
PINCTRL_DT_INST_DEFINE(inst); \
\
static struct i2c_b91_data i2c_b91_data_##inst; \
\
static struct i2c_b91_cfg i2c_b91_cfg_##inst = { \
.bitrate = DT_INST_PROP(inst, clock_frequency), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(inst), \
}; \
\
I2C_DEVICE_DT_INST_DEFINE(inst, i2c_b91_init, \
NULL, \
&i2c_b91_data_##inst, \
&i2c_b91_cfg_##inst, \
POST_KERNEL, \
CONFIG_I2C_INIT_PRIORITY, \
&i2c_b91_api);
DT_INST_FOREACH_STATUS_OKAY(I2C_B91_INIT)