258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
/*
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* Copyright (c) 2016 Freescale Semiconductor, Inc.
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* Copyright (c) 2019, NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nxp_imx_lpi2c
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#include <errno.h>
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#include <drivers/i2c.h>
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#include <drivers/clock_control.h>
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#include <fsl_lpi2c.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(mcux_lpi2c);
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#include "i2c-priv.h"
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struct mcux_lpi2c_config {
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LPI2C_Type *base;
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char *clock_name;
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clock_control_subsys_t clock_subsys;
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void (*irq_config_func)(struct device *dev);
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uint32_t bitrate;
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uint32_t bus_idle_timeout_ns;
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};
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struct mcux_lpi2c_data {
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lpi2c_master_handle_t handle;
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struct k_sem device_sync_sem;
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status_t callback_status;
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};
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static int mcux_lpi2c_configure(struct device *dev, uint32_t dev_config_raw)
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{
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const struct mcux_lpi2c_config *config = dev->config_info;
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LPI2C_Type *base = config->base;
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struct device *clock_dev;
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uint32_t clock_freq;
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uint32_t baudrate;
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if (!(I2C_MODE_MASTER & dev_config_raw)) {
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return -EINVAL;
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}
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if (I2C_ADDR_10_BITS & dev_config_raw) {
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return -EINVAL;
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}
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switch (I2C_SPEED_GET(dev_config_raw)) {
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case I2C_SPEED_STANDARD:
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baudrate = KHZ(100);
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break;
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case I2C_SPEED_FAST:
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baudrate = KHZ(400);
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break;
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case I2C_SPEED_FAST_PLUS:
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baudrate = MHZ(1);
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break;
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default:
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return -EINVAL;
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}
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clock_dev = device_get_binding(config->clock_name);
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if (clock_dev == NULL) {
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return -EINVAL;
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}
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if (clock_control_get_rate(clock_dev, config->clock_subsys,
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&clock_freq)) {
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return -EINVAL;
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}
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LPI2C_MasterSetBaudRate(base, clock_freq, baudrate);
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return 0;
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}
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static void mcux_lpi2c_master_transfer_callback(LPI2C_Type *base,
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lpi2c_master_handle_t *handle, status_t status, void *userData)
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{
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struct device *dev = userData;
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struct mcux_lpi2c_data *data = dev->driver_data;
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ARG_UNUSED(handle);
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ARG_UNUSED(base);
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data->callback_status = status;
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k_sem_give(&data->device_sync_sem);
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}
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static uint32_t mcux_lpi2c_convert_flags(int msg_flags)
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{
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uint32_t flags = 0U;
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if (!(msg_flags & I2C_MSG_STOP)) {
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flags |= kLPI2C_TransferNoStopFlag;
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}
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if (msg_flags & I2C_MSG_RESTART) {
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flags |= kLPI2C_TransferRepeatedStartFlag;
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}
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return flags;
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}
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static int mcux_lpi2c_transfer(struct device *dev, struct i2c_msg *msgs,
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uint8_t num_msgs, uint16_t addr)
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{
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const struct mcux_lpi2c_config *config = dev->config_info;
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struct mcux_lpi2c_data *data = dev->driver_data;
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LPI2C_Type *base = config->base;
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lpi2c_master_transfer_t transfer;
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status_t status;
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/* Iterate over all the messages */
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for (int i = 0; i < num_msgs; i++) {
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if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
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return -ENOTSUP;
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}
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/* Initialize the transfer descriptor */
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transfer.flags = mcux_lpi2c_convert_flags(msgs->flags);
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/* Prevent the controller to send a start condition between
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* messages, except if explicitly requested.
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*/
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if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
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transfer.flags |= kLPI2C_TransferNoStartFlag;
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}
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transfer.slaveAddress = addr;
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transfer.direction = (msgs->flags & I2C_MSG_READ)
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? kLPI2C_Read : kLPI2C_Write;
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transfer.subaddress = 0;
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transfer.subaddressSize = 0;
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transfer.data = msgs->buf;
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transfer.dataSize = msgs->len;
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/* Start the transfer */
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status = LPI2C_MasterTransferNonBlocking(base,
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&data->handle, &transfer);
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/* Return an error if the transfer didn't start successfully
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* e.g., if the bus was busy
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*/
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if (status != kStatus_Success) {
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return -EIO;
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}
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/* Wait for the transfer to complete */
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k_sem_take(&data->device_sync_sem, K_FOREVER);
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/* Return an error if the transfer didn't complete
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* successfully. e.g., nak, timeout, lost arbitration
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*/
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if (data->callback_status != kStatus_Success) {
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return -EIO;
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}
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/* Move to the next message */
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msgs++;
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}
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return 0;
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}
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static void mcux_lpi2c_isr(void *arg)
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{
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struct device *dev = (struct device *)arg;
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const struct mcux_lpi2c_config *config = dev->config_info;
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struct mcux_lpi2c_data *data = dev->driver_data;
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LPI2C_Type *base = config->base;
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LPI2C_MasterTransferHandleIRQ(base, &data->handle);
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}
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static int mcux_lpi2c_init(struct device *dev)
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{
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const struct mcux_lpi2c_config *config = dev->config_info;
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struct mcux_lpi2c_data *data = dev->driver_data;
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LPI2C_Type *base = config->base;
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struct device *clock_dev;
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uint32_t clock_freq, bitrate_cfg;
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lpi2c_master_config_t master_config;
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int error;
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k_sem_init(&data->device_sync_sem, 0, UINT_MAX);
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clock_dev = device_get_binding(config->clock_name);
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if (clock_dev == NULL) {
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return -EINVAL;
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}
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if (clock_control_get_rate(clock_dev, config->clock_subsys,
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&clock_freq)) {
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return -EINVAL;
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}
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LPI2C_MasterGetDefaultConfig(&master_config);
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master_config.busIdleTimeout_ns = config->bus_idle_timeout_ns;
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LPI2C_MasterInit(base, &master_config, clock_freq);
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LPI2C_MasterTransferCreateHandle(base, &data->handle,
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mcux_lpi2c_master_transfer_callback, dev);
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bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
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error = mcux_lpi2c_configure(dev, I2C_MODE_MASTER | bitrate_cfg);
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if (error) {
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return error;
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}
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config->irq_config_func(dev);
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return 0;
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}
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static const struct i2c_driver_api mcux_lpi2c_driver_api = {
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.configure = mcux_lpi2c_configure,
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.transfer = mcux_lpi2c_transfer,
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};
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#define I2C_MCUX_LPI2C_INIT(n) \
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static void mcux_lpi2c_config_func_##n(struct device *dev); \
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\
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static const struct mcux_lpi2c_config mcux_lpi2c_config_##n = { \
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.base = (LPI2C_Type *)DT_INST_REG_ADDR(n), \
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.clock_name = DT_INST_CLOCKS_LABEL(n), \
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.clock_subsys = \
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(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
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.irq_config_func = mcux_lpi2c_config_func_##n, \
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.bitrate = DT_INST_PROP(n, clock_frequency), \
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.bus_idle_timeout_ns = \
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UTIL_AND(DT_INST_NODE_HAS_PROP(n, bus_idle_timeout),\
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DT_INST_PROP(n, bus_idle_timeout)), \
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}; \
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\
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static struct mcux_lpi2c_data mcux_lpi2c_data_##n; \
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\
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DEVICE_AND_API_INIT(mcux_lpi2c_##n, DT_INST_LABEL(n), \
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&mcux_lpi2c_init, &mcux_lpi2c_data_##n, \
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&mcux_lpi2c_config_##n, POST_KERNEL, \
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
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&mcux_lpi2c_driver_api); \
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\
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static void mcux_lpi2c_config_func_##n(struct device *dev) \
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{ \
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IRQ_CONNECT(DT_INST_IRQN(n), \
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DT_INST_IRQ(n, priority), \
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mcux_lpi2c_isr, \
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DEVICE_GET(mcux_lpi2c_##n), 0); \
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\
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irq_enable(DT_INST_IRQN(n)); \
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}
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DT_INST_FOREACH_STATUS_OKAY(I2C_MCUX_LPI2C_INIT)
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