280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 2016 Freescale Semiconductor, Inc.
|
|
* Copyright (c) 2019, NXP
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT nxp_imx_lpi2c
|
|
|
|
#include <errno.h>
|
|
#include <drivers/i2c.h>
|
|
#include <drivers/clock_control.h>
|
|
#include <fsl_lpi2c.h>
|
|
|
|
#include <logging/log.h>
|
|
LOG_MODULE_REGISTER(mcux_lpi2c);
|
|
|
|
#include "i2c-priv.h"
|
|
/* Wait for the duration of 12 bits to detect a NAK after a bus
|
|
* address scan. (10 appears sufficient, 20% safety factor.)
|
|
*/
|
|
#define SCAN_DELAY_US(baudrate) (12 * USEC_PER_SEC / baudrate)
|
|
|
|
struct mcux_lpi2c_config {
|
|
LPI2C_Type *base;
|
|
const struct device *clock_dev;
|
|
clock_control_subsys_t clock_subsys;
|
|
void (*irq_config_func)(const struct device *dev);
|
|
uint32_t bitrate;
|
|
uint32_t bus_idle_timeout_ns;
|
|
};
|
|
|
|
struct mcux_lpi2c_data {
|
|
lpi2c_master_handle_t handle;
|
|
struct k_sem lock;
|
|
struct k_sem device_sync_sem;
|
|
status_t callback_status;
|
|
};
|
|
|
|
static int mcux_lpi2c_configure(const struct device *dev,
|
|
uint32_t dev_config_raw)
|
|
{
|
|
const struct mcux_lpi2c_config *config = dev->config;
|
|
struct mcux_lpi2c_data *data = dev->data;
|
|
LPI2C_Type *base = config->base;
|
|
uint32_t clock_freq;
|
|
uint32_t baudrate;
|
|
int ret;
|
|
|
|
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 = KHZ(400);
|
|
break;
|
|
case I2C_SPEED_FAST_PLUS:
|
|
baudrate = MHZ(1);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
|
|
&clock_freq)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = k_sem_take(&data->lock, K_FOREVER);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
LPI2C_MasterSetBaudRate(base, clock_freq, baudrate);
|
|
k_sem_give(&data->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mcux_lpi2c_master_transfer_callback(LPI2C_Type *base,
|
|
lpi2c_master_handle_t *handle,
|
|
status_t status, void *userData)
|
|
{
|
|
struct mcux_lpi2c_data *data = userData;
|
|
|
|
ARG_UNUSED(handle);
|
|
ARG_UNUSED(base);
|
|
|
|
data->callback_status = status;
|
|
k_sem_give(&data->device_sync_sem);
|
|
}
|
|
|
|
static uint32_t mcux_lpi2c_convert_flags(int msg_flags)
|
|
{
|
|
uint32_t flags = 0U;
|
|
|
|
if (!(msg_flags & I2C_MSG_STOP)) {
|
|
flags |= kLPI2C_TransferNoStopFlag;
|
|
}
|
|
|
|
if (msg_flags & I2C_MSG_RESTART) {
|
|
flags |= kLPI2C_TransferRepeatedStartFlag;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
static int mcux_lpi2c_transfer(const struct device *dev, struct i2c_msg *msgs,
|
|
uint8_t num_msgs, uint16_t addr)
|
|
{
|
|
const struct mcux_lpi2c_config *config = dev->config;
|
|
struct mcux_lpi2c_data *data = dev->data;
|
|
LPI2C_Type *base = config->base;
|
|
lpi2c_master_transfer_t transfer;
|
|
status_t status;
|
|
int ret = 0;
|
|
|
|
ret = k_sem_take(&data->lock, K_FOREVER);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/* Iterate over all the messages */
|
|
for (int i = 0; i < num_msgs; i++) {
|
|
if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
|
|
ret = -ENOTSUP;
|
|
break;
|
|
}
|
|
|
|
/* Initialize the transfer descriptor */
|
|
transfer.flags = mcux_lpi2c_convert_flags(msgs->flags);
|
|
|
|
/* Prevent the controller to send a start condition between
|
|
* messages, except if explicitly requested.
|
|
*/
|
|
if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
|
|
transfer.flags |= kLPI2C_TransferNoStartFlag;
|
|
}
|
|
|
|
transfer.slaveAddress = addr;
|
|
transfer.direction = (msgs->flags & I2C_MSG_READ)
|
|
? kLPI2C_Read : kLPI2C_Write;
|
|
transfer.subaddress = 0;
|
|
transfer.subaddressSize = 0;
|
|
transfer.data = msgs->buf;
|
|
transfer.dataSize = msgs->len;
|
|
|
|
/* Start the transfer */
|
|
status = LPI2C_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) {
|
|
LPI2C_MasterTransferAbort(base, &data->handle);
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* 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) {
|
|
LPI2C_MasterTransferAbort(base, &data->handle);
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
if (msgs->len == 0) {
|
|
k_busy_wait(SCAN_DELAY_US(config->bitrate));
|
|
if (0 != (base->MSR & LPI2C_MSR_NDF_MASK)) {
|
|
LPI2C_MasterTransferAbort(base, &data->handle);
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
}
|
|
/* Move to the next message */
|
|
msgs++;
|
|
}
|
|
|
|
k_sem_give(&data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void mcux_lpi2c_isr(const struct device *dev)
|
|
{
|
|
const struct mcux_lpi2c_config *config = dev->config;
|
|
struct mcux_lpi2c_data *data = dev->data;
|
|
LPI2C_Type *base = config->base;
|
|
|
|
LPI2C_MasterTransferHandleIRQ(base, &data->handle);
|
|
}
|
|
|
|
static int mcux_lpi2c_init(const struct device *dev)
|
|
{
|
|
const struct mcux_lpi2c_config *config = dev->config;
|
|
struct mcux_lpi2c_data *data = dev->data;
|
|
LPI2C_Type *base = config->base;
|
|
uint32_t clock_freq, bitrate_cfg;
|
|
lpi2c_master_config_t master_config;
|
|
int error;
|
|
|
|
k_sem_init(&data->lock, 1, 1);
|
|
k_sem_init(&data->device_sync_sem, 0, K_SEM_MAX_LIMIT);
|
|
if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
|
|
&clock_freq)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
LPI2C_MasterGetDefaultConfig(&master_config);
|
|
master_config.busIdleTimeout_ns = config->bus_idle_timeout_ns;
|
|
LPI2C_MasterInit(base, &master_config, clock_freq);
|
|
LPI2C_MasterTransferCreateHandle(base, &data->handle,
|
|
mcux_lpi2c_master_transfer_callback,
|
|
data);
|
|
|
|
bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
|
|
|
|
error = mcux_lpi2c_configure(dev, I2C_MODE_MASTER | bitrate_cfg);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
|
|
config->irq_config_func(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_driver_api mcux_lpi2c_driver_api = {
|
|
.configure = mcux_lpi2c_configure,
|
|
.transfer = mcux_lpi2c_transfer,
|
|
};
|
|
|
|
#define I2C_MCUX_LPI2C_INIT(n) \
|
|
static void mcux_lpi2c_config_func_##n(const struct device *dev); \
|
|
\
|
|
static const struct mcux_lpi2c_config mcux_lpi2c_config_##n = { \
|
|
.base = (LPI2C_Type *)DT_INST_REG_ADDR(n), \
|
|
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
|
|
.clock_subsys = \
|
|
(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
|
|
.irq_config_func = mcux_lpi2c_config_func_##n, \
|
|
.bitrate = DT_INST_PROP(n, clock_frequency), \
|
|
.bus_idle_timeout_ns = \
|
|
UTIL_AND(DT_INST_NODE_HAS_PROP(n, bus_idle_timeout),\
|
|
DT_INST_PROP(n, bus_idle_timeout)), \
|
|
}; \
|
|
\
|
|
static struct mcux_lpi2c_data mcux_lpi2c_data_##n; \
|
|
\
|
|
DEVICE_DT_INST_DEFINE(n, &mcux_lpi2c_init, device_pm_control_nop,\
|
|
&mcux_lpi2c_data_##n, \
|
|
&mcux_lpi2c_config_##n, POST_KERNEL, \
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
|
|
&mcux_lpi2c_driver_api); \
|
|
\
|
|
static void mcux_lpi2c_config_func_##n(const struct device *dev) \
|
|
{ \
|
|
IRQ_CONNECT(DT_INST_IRQN(n), \
|
|
DT_INST_IRQ(n, priority), \
|
|
mcux_lpi2c_isr, \
|
|
DEVICE_DT_INST_GET(n), 0); \
|
|
\
|
|
irq_enable(DT_INST_IRQN(n)); \
|
|
}
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(I2C_MCUX_LPI2C_INIT)
|