/*
* Copyright (c) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <i2c.h>
#include <soc.h>
#include <fsl_i2c.h>
#include <fsl_clock.h>
#include <misc/util.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(i2c_mcux);
#include "i2c-priv.h"
#define DEV_CFG(dev) \
((const struct i2c_mcux_config * const)(dev)->config->config_info)
#define DEV_DATA(dev) \
((struct i2c_mcux_data * const)(dev)->driver_data)
#define DEV_BASE(dev) \
((I2C_Type *)(DEV_CFG(dev))->base)
struct i2c_mcux_config {
I2C_Type *base;
clock_name_t clock_source;
void (*irq_config_func)(struct device *dev);
u32_t bitrate;
};
struct i2c_mcux_data {
i2c_master_handle_t handle;
struct k_sem device_sync_sem;
status_t callback_status;
};
static int i2c_mcux_configure(struct device *dev, u32_t dev_config_raw)
{
I2C_Type *base = DEV_BASE(dev);
const struct i2c_mcux_config *config = DEV_CFG(dev);
u32_t clock_freq;
u32_t baudrate;
if (!(I2C_MODE_MASTER & dev_config_raw)) {
return -EINVAL;
}
if (I2C_ADDR_10_BITS & dev_config_raw) {
return -EINVAL;
}
switch (I2C_SPEED_GET(dev_config_raw)) {
case I2C_SPEED_STANDARD:
baudrate = KHZ(100);
break;
case I2C_SPEED_FAST:
baudrate = MHZ(1);
break;
default:
return -EINVAL;
}
clock_freq = CLOCK_GetFreq(config->clock_source);
I2C_MasterSetBaudRate(base, baudrate, clock_freq);
return 0;
}
static void i2c_mcux_master_transfer_callback(I2C_Type *base,
i2c_master_handle_t *handle, status_t status, void *userData)
{
struct device *dev = userData;
struct i2c_mcux_data *data = DEV_DATA(dev);
ARG_UNUSED(handle);
ARG_UNUSED(base);
data->callback_status = status;
k_sem_give(&data->device_sync_sem);
}
static u32_t i2c_mcux_convert_flags(int msg_flags)
{
u32_t flags = 0U;
if (!(msg_flags & I2C_MSG_STOP)) {
flags |= kI2C_TransferNoStopFlag;
}
if (msg_flags & I2C_MSG_RESTART) {
flags |= kI2C_TransferRepeatedStartFlag;
}
return flags;
}
static int i2c_mcux_transfer(struct device *dev, struct i2c_msg *msgs,
u8_t num_msgs, u16_t addr)
{
I2C_Type *base = DEV_BASE(dev);
struct i2c_mcux_data *data = DEV_DATA(dev);
i2c_master_transfer_t transfer;
status_t status;
/* Iterate over all the messages */
for (int i = 0; i < num_msgs; i++) {
if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
return -ENOTSUP;
}
/* Initialize the transfer descriptor */
transfer.flags = i2c_mcux_convert_flags(msgs->flags);
transfer.slaveAddress = addr;
transfer.direction = (msgs->flags & I2C_MSG_READ)
? kI2C_Read : kI2C_Write;
transfer.subaddress = 0;
transfer.subaddressSize = 0;
transfer.data = msgs->buf;
transfer.dataSize = msgs->len;
/* Prevent the controller to send a start condition between
* messages, except if explicitely requested.
*/
if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
transfer.flags |= kI2C_TransferNoStartFlag;
}
/* Start the transfer */
status = I2C_MasterTransferNonBlocking(base,
&data->handle, &transfer);
/* Return an error if the transfer didn't start successfully
* e.g., if the bus was busy
*/
if (status != kStatus_Success) {
return -EIO;
}
/* Wait for the transfer to complete */
k_sem_take(&data->device_sync_sem, K_FOREVER);
/* Return an error if the transfer didn't complete
* successfully. e.g., nak, timeout, lost arbitration
*/
if (data->callback_status != kStatus_Success) {
return -EIO;
}
/* Move to the next message */
msgs++;
}
return 0;
}
static void i2c_mcux_isr(void *arg)
{
struct device *dev = (struct device *)arg;
I2C_Type *base = DEV_BASE(dev);
struct i2c_mcux_data *data = DEV_DATA(dev);
I2C_MasterTransferHandleIRQ(base, &data->handle);
}
static int i2c_mcux_init(struct device *dev)
{
I2C_Type *base = DEV_BASE(dev);
const struct i2c_mcux_config *config = DEV_CFG(dev);
struct i2c_mcux_data *data = DEV_DATA(dev);
u32_t clock_freq, bitrate_cfg;
i2c_master_config_t master_config;
int error;
k_sem_init(&data->device_sync_sem, 0, UINT_MAX);
clock_freq = CLOCK_GetFreq(config->clock_source);
I2C_MasterGetDefaultConfig(&master_config);
I2C_MasterInit(base, &master_config, clock_freq);
I2C_MasterTransferCreateHandle(base, &data->handle,
i2c_mcux_master_transfer_callback, dev);
bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
error = i2c_mcux_configure(dev, I2C_MODE_MASTER | bitrate_cfg);
if (error) {
return error;
}
config->irq_config_func(dev);
return 0;
}
static const struct i2c_driver_api i2c_mcux_driver_api = {
.configure = i2c_mcux_configure,
.transfer = i2c_mcux_transfer,
};
#ifdef CONFIG_I2C_0
static void i2c_mcux_config_func_0(struct device *dev);
static const struct i2c_mcux_config i2c_mcux_config_0 = {
.base = (I2C_Type *)DT_I2C_MCUX_0_BASE_ADDRESS,
.clock_source = I2C0_CLK_SRC,
.irq_config_func = i2c_mcux_config_func_0,
.bitrate = DT_I2C_MCUX_0_BITRATE,
};
static struct i2c_mcux_data i2c_mcux_data_0;
DEVICE_AND_API_INIT(i2c_mcux_0, CONFIG_I2C_0_NAME, &i2c_mcux_init,
&i2c_mcux_data_0, &i2c_mcux_config_0,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&i2c_mcux_driver_api);
static void i2c_mcux_config_func_0(struct device *dev)
{
ARG_UNUSED(dev);
IRQ_CONNECT(DT_I2C_MCUX_0_IRQ, DT_I2C_MCUX_0_IRQ_PRI,
i2c_mcux_isr, DEVICE_GET(i2c_mcux_0), 0);
irq_enable(DT_I2C_MCUX_0_IRQ);
}
#endif /* CONFIG_I2C_0 */
#ifdef CONFIG_I2C_1
static void i2c_mcux_config_func_1(struct device *dev);
static const struct i2c_mcux_config i2c_mcux_config_1 = {
.base = (I2C_Type *)DT_I2C_MCUX_1_BASE_ADDRESS,
.clock_source = I2C1_CLK_SRC,
.irq_config_func = i2c_mcux_config_func_1,
.bitrate = DT_I2C_MCUX_1_BITRATE,
};
static struct i2c_mcux_data i2c_mcux_data_1;
DEVICE_AND_API_INIT(i2c_mcux_1, CONFIG_I2C_1_NAME, &i2c_mcux_init,
&i2c_mcux_data_1, &i2c_mcux_config_1,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&i2c_mcux_driver_api);
static void i2c_mcux_config_func_1(struct device *dev)
{
IRQ_CONNECT(DT_I2C_MCUX_1_IRQ, DT_I2C_MCUX_1_IRQ_PRI,
i2c_mcux_isr, DEVICE_GET(i2c_mcux_1), 0);
irq_enable(DT_I2C_MCUX_1_IRQ);
}
#endif /* CONFIG_I2C_1 */