mirror of
https://github.com/zephyrproject-rtos/zephyr
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914daf4ec7
TWI and TWIM used single static variable for multiple instances. It would cause problems in case of multiple instances of peripheral. Signed-off-by: Mieszko Mierunski <mieszko.mierunski@nordicsemi.no>
271 lines
6.9 KiB
C
271 lines
6.9 KiB
C
/*
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* Copyright (c) 2018, Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/i2c.h>
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#include <dt-bindings/i2c/i2c.h>
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#include <nrfx_twim.h>
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#define LOG_DOMAIN "i2c_nrfx_twim"
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#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(i2c_nrfx_twim);
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struct i2c_nrfx_twim_data {
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struct k_sem transfer_sync;
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struct k_sem completion_sync;
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volatile nrfx_err_t res;
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uint32_t dev_config;
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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u32_t pm_state;
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#endif
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};
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struct i2c_nrfx_twim_config {
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nrfx_twim_t twim;
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nrfx_twim_config_t config;
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};
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static inline struct i2c_nrfx_twim_data *get_dev_data(struct device *dev)
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{
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return dev->driver_data;
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}
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static inline
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const struct i2c_nrfx_twim_config *get_dev_config(struct device *dev)
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{
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return dev->config->config_info;
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}
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static int i2c_nrfx_twim_transfer(struct device *dev, struct i2c_msg *msgs,
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u8_t num_msgs, u16_t addr)
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{
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int ret = 0;
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k_sem_take(&(get_dev_data(dev)->transfer_sync), K_FOREVER);
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nrfx_twim_enable(&get_dev_config(dev)->twim);
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for (size_t i = 0; i < num_msgs; i++) {
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if (I2C_MSG_ADDR_10_BITS & msgs[i].flags) {
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ret = -ENOTSUP;
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break;
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}
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nrfx_twim_xfer_desc_t cur_xfer = {
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.p_primary_buf = msgs[i].buf,
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.primary_length = msgs[i].len,
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.address = addr,
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.type = (msgs[i].flags & I2C_MSG_READ) ?
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NRFX_TWIM_XFER_RX : NRFX_TWIM_XFER_TX
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};
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nrfx_err_t res = nrfx_twim_xfer(&get_dev_config(dev)->twim,
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&cur_xfer,
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(msgs[i].flags & I2C_MSG_STOP) ?
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0 : NRFX_TWIM_FLAG_TX_NO_STOP);
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if (res != NRFX_SUCCESS) {
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if (res == NRFX_ERROR_BUSY) {
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ret = -EBUSY;
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break;
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} else {
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ret = -EIO;
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break;
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}
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}
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k_sem_take(&(get_dev_data(dev)->completion_sync), K_FOREVER);
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res = get_dev_data(dev)->res;
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if (res != NRFX_SUCCESS) {
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LOG_ERR("Error %d occurred for message %d", res, i);
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ret = -EIO;
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break;
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}
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}
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nrfx_twim_disable(&get_dev_config(dev)->twim);
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k_sem_give(&(get_dev_data(dev)->transfer_sync));
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return ret;
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}
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static void event_handler(nrfx_twim_evt_t const *p_event, void *p_context)
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{
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struct device *dev = p_context;
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struct i2c_nrfx_twim_data *dev_data = get_dev_data(dev);
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switch (p_event->type) {
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case NRFX_TWIM_EVT_DONE:
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dev_data->res = NRFX_SUCCESS;
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break;
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case NRFX_TWIM_EVT_ADDRESS_NACK:
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dev_data->res = NRFX_ERROR_DRV_TWI_ERR_ANACK;
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break;
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case NRFX_TWIM_EVT_DATA_NACK:
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dev_data->res = NRFX_ERROR_DRV_TWI_ERR_DNACK;
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break;
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default:
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dev_data->res = NRFX_ERROR_INTERNAL;
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break;
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}
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k_sem_give(&dev_data->completion_sync);
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}
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static int i2c_nrfx_twim_configure(struct device *dev, u32_t dev_config)
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{
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nrfx_twim_t const *inst = &(get_dev_config(dev)->twim);
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if (I2C_ADDR_10_BITS & dev_config) {
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return -EINVAL;
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}
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switch (I2C_SPEED_GET(dev_config)) {
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case I2C_SPEED_STANDARD:
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nrf_twim_frequency_set(inst->p_twim, NRF_TWIM_FREQ_100K);
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break;
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case I2C_SPEED_FAST:
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nrf_twim_frequency_set(inst->p_twim, NRF_TWIM_FREQ_400K);
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break;
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default:
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LOG_ERR("unsupported speed");
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return -EINVAL;
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}
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get_dev_data(dev)->dev_config = dev_config;
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return 0;
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}
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static const struct i2c_driver_api i2c_nrfx_twim_driver_api = {
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.configure = i2c_nrfx_twim_configure,
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.transfer = i2c_nrfx_twim_transfer,
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};
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static int init_twim(struct device *dev)
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{
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nrfx_err_t result = nrfx_twim_init(&get_dev_config(dev)->twim,
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&get_dev_config(dev)->config,
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event_handler,
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dev);
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if (result != NRFX_SUCCESS) {
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LOG_ERR("Failed to initialize device: %s",
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dev->config->name);
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return -EBUSY;
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}
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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get_dev_data(dev)->pm_state = DEVICE_PM_ACTIVE_STATE;
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#endif
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return 0;
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}
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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static int twim_nrfx_pm_control(struct device *dev, u32_t ctrl_command,
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void *context, device_pm_cb cb, void *arg)
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{
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int ret = 0;
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if (ctrl_command == DEVICE_PM_SET_POWER_STATE) {
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u32_t new_state = *((const u32_t *)context);
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if (new_state != get_dev_data(dev)->pm_state) {
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switch (new_state) {
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case DEVICE_PM_ACTIVE_STATE:
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init_twim(dev);
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if (get_dev_data(dev)->dev_config) {
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i2c_nrfx_twim_configure(
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dev,
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get_dev_data(dev)->dev_config);
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}
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break;
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case DEVICE_PM_LOW_POWER_STATE:
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case DEVICE_PM_SUSPEND_STATE:
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case DEVICE_PM_OFF_STATE:
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nrfx_twim_uninit(&get_dev_config(dev)->twim);
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break;
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default:
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ret = -ENOTSUP;
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}
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if (!ret) {
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get_dev_data(dev)->pm_state = new_state;
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}
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}
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} else {
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assert(ctrl_command == DEVICE_PM_GET_POWER_STATE);
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*((u32_t *)context) = get_dev_data(dev)->pm_state;
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}
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if (cb) {
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cb(dev, ret, context, arg);
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}
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return ret;
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}
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#endif /* CONFIG_DEVICE_POWER_MANAGEMENT */
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#define I2C_NRFX_TWIM_INVALID_FREQUENCY ((nrf_twim_frequency_t)-1)
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#define I2C_NRFX_TWIM_FREQUENCY(bitrate) \
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(bitrate == I2C_BITRATE_STANDARD ? NRF_TWIM_FREQ_100K \
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: bitrate == 250000 ? NRF_TWIM_FREQ_250K \
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: bitrate == I2C_BITRATE_FAST ? NRF_TWIM_FREQ_400K \
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: I2C_NRFX_TWIM_INVALID_FREQUENCY)
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#define I2C_NRFX_TWIM_DEVICE(idx) \
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BUILD_ASSERT_MSG( \
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I2C_NRFX_TWIM_FREQUENCY( \
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DT_NORDIC_NRF_I2C_I2C_##idx##_CLOCK_FREQUENCY) \
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!= I2C_NRFX_TWIM_INVALID_FREQUENCY, \
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"Wrong I2C " #idx " frequency setting in dts"); \
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static int twim_##idx##_init(struct device *dev) \
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{ \
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IRQ_CONNECT(DT_NORDIC_NRF_I2C_I2C_##idx##_IRQ_0, \
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DT_NORDIC_NRF_I2C_I2C_##idx##_IRQ_0_PRIORITY, \
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nrfx_isr, nrfx_twim_##idx##_irq_handler, 0); \
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return init_twim(dev); \
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} \
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static struct i2c_nrfx_twim_data twim_##idx##_data = { \
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.transfer_sync = Z_SEM_INITIALIZER( \
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twim_##idx##_data.transfer_sync, 1, 1), \
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.completion_sync = Z_SEM_INITIALIZER( \
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twim_##idx##_data.completion_sync, 0, 1) \
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}; \
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static const struct i2c_nrfx_twim_config twim_##idx##z_config = { \
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.twim = NRFX_TWIM_INSTANCE(idx), \
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.config = { \
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.scl = DT_NORDIC_NRF_I2C_I2C_##idx##_SCL_PIN, \
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.sda = DT_NORDIC_NRF_I2C_I2C_##idx##_SDA_PIN, \
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.frequency = I2C_NRFX_TWIM_FREQUENCY( \
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DT_NORDIC_NRF_I2C_I2C_##idx##_CLOCK_FREQUENCY) \
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} \
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}; \
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DEVICE_DEFINE(twim_##idx, \
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DT_NORDIC_NRF_I2C_I2C_##idx##_LABEL, \
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twim_##idx##_init, \
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twim_nrfx_pm_control, \
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&twim_##idx##_data, \
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&twim_##idx##z_config, \
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POST_KERNEL, \
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CONFIG_I2C_INIT_PRIORITY, \
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&i2c_nrfx_twim_driver_api)
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#ifdef CONFIG_I2C_0_NRF_TWIM
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I2C_NRFX_TWIM_DEVICE(0);
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#endif
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#ifdef CONFIG_I2C_1_NRF_TWIM
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I2C_NRFX_TWIM_DEVICE(1);
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#endif
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#ifdef CONFIG_I2C_2_NRF_TWIM
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I2C_NRFX_TWIM_DEVICE(2);
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#endif
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#ifdef CONFIG_I2C_3_NRF_TWIM
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I2C_NRFX_TWIM_DEVICE(3);
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#endif
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