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/*
* Copyright (c) 2017, NXP
* Copyright (c) 2020 PHYTEC Messtechnik GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_kinetis_uart
#include <errno.h>
#include <device.h>
#include <drivers/uart.h>
#include <drivers/clock_control.h>
#include <fsl_uart.h>
#include <soc.h>
struct uart_mcux_config {
UART_Type *base;
const struct device *clock_dev;
clock_control_subsys_t clock_subsys;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
void (*irq_config_func)(const struct device *dev);
#endif
};
struct uart_mcux_data {
struct uart_config uart_cfg;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_user_data_t callback;
void *cb_data;
#endif
};
static int uart_mcux_configure(const struct device *dev,
const struct uart_config *cfg)
{
const struct uart_mcux_config *config = dev->config;
struct uart_mcux_data *data = dev->data;
uart_config_t uart_config;
uint32_t clock_freq;
status_t retval;
if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
&clock_freq)) {
return -EINVAL;
}
UART_GetDefaultConfig(&uart_config);
uart_config.enableTx = true;
uart_config.enableRx = true;
uart_config.baudRate_Bps = cfg->baudrate;
switch (cfg->stop_bits) {
case UART_CFG_STOP_BITS_1:
#if defined(FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT) && \
FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT
uart_config.stopBitCount = kUART_OneStopBit;
break;
case UART_CFG_STOP_BITS_2:
uart_config.stopBitCount = kUART_TwoStopBit;
#endif
break;
default:
return -ENOTSUP;
}
switch (cfg->flow_ctrl) {
case UART_CFG_FLOW_CTRL_NONE:
uart_config.enableRxRTS = false;
uart_config.enableTxCTS = false;
break;
case UART_CFG_FLOW_CTRL_RTS_CTS:
uart_config.enableRxRTS = true;
uart_config.enableTxCTS = true;
break;
default:
return -ENOTSUP;
}
switch (cfg->parity) {
case UART_CFG_PARITY_NONE:
uart_config.parityMode = kUART_ParityDisabled;
break;
case UART_CFG_PARITY_EVEN:
uart_config.parityMode = kUART_ParityEven;
break;
case UART_CFG_PARITY_ODD:
uart_config.parityMode = kUART_ParityOdd;
break;
default:
return -ENOTSUP;
}
retval = UART_Init(config->base, &uart_config, clock_freq);
if (retval != kStatus_Success) {
return -EINVAL;
}
data->uart_cfg = *cfg;
return 0;
}
#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
static int uart_mcux_config_get(const struct device *dev,
struct uart_config *cfg)
{
struct uart_mcux_data *data = dev->data;
*cfg = data->uart_cfg;
return 0;
}
#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */
static int uart_mcux_poll_in(const struct device *dev, unsigned char *c)
{
const struct uart_mcux_config *config = dev->config;
uint32_t flags = UART_GetStatusFlags(config->base);
int ret = -1;
if (flags & kUART_RxDataRegFullFlag) {
*c = UART_ReadByte(config->base);
ret = 0;
}
return ret;
}
static void uart_mcux_poll_out(const struct device *dev, unsigned char c)
{
const struct uart_mcux_config *config = dev->config;
while (!(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
}
UART_WriteByte(config->base, c);
}
static int uart_mcux_err_check(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t flags = UART_GetStatusFlags(config->base);
int err = 0;
if (flags & kUART_RxOverrunFlag) {
err |= UART_ERROR_OVERRUN;
}
if (flags & kUART_ParityErrorFlag) {
err |= UART_ERROR_PARITY;
}
if (flags & kUART_FramingErrorFlag) {
err |= UART_ERROR_FRAMING;
}
UART_ClearStatusFlags(config->base, kUART_RxOverrunFlag |
kUART_ParityErrorFlag |
kUART_FramingErrorFlag);
return err;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int uart_mcux_fifo_fill(const struct device *dev,
const uint8_t *tx_data,
int len)
{
const struct uart_mcux_config *config = dev->config;
uint8_t num_tx = 0U;
while ((len - num_tx > 0) &&
(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
UART_WriteByte(config->base, tx_data[num_tx++]);
}
return num_tx;
}
static int uart_mcux_fifo_read(const struct device *dev, uint8_t *rx_data,
const int len)
{
const struct uart_mcux_config *config = dev->config;
uint8_t num_rx = 0U;
while ((len - num_rx > 0) &&
(UART_GetStatusFlags(config->base) & kUART_RxDataRegFullFlag)) {
rx_data[num_rx++] = UART_ReadByte(config->base);
}
return num_rx;
}
static void uart_mcux_irq_tx_enable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
UART_EnableInterrupts(config->base, mask);
}
static void uart_mcux_irq_tx_disable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
UART_DisableInterrupts(config->base, mask);
}
static int uart_mcux_irq_tx_complete(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t flags = UART_GetStatusFlags(config->base);
return (flags & kUART_TransmissionCompleteFlag) != 0U;
}
static int uart_mcux_irq_tx_ready(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
uint32_t flags = UART_GetStatusFlags(config->base);
return (UART_GetEnabledInterrupts(config->base) & mask)
&& (flags & kUART_TxDataRegEmptyFlag);
}
static void uart_mcux_irq_rx_enable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_RxDataRegFullInterruptEnable;
UART_EnableInterrupts(config->base, mask);
}
static void uart_mcux_irq_rx_disable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_RxDataRegFullInterruptEnable;
UART_DisableInterrupts(config->base, mask);
}
static int uart_mcux_irq_rx_full(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t flags = UART_GetStatusFlags(config->base);
return (flags & kUART_RxDataRegFullFlag) != 0U;
}
static int uart_mcux_irq_rx_pending(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_RxDataRegFullInterruptEnable;
return (UART_GetEnabledInterrupts(config->base) & mask)
&& uart_mcux_irq_rx_full(dev);
}
static void uart_mcux_irq_err_enable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_NoiseErrorInterruptEnable |
kUART_FramingErrorInterruptEnable |
kUART_ParityErrorInterruptEnable;
UART_EnableInterrupts(config->base, mask);
}
static void uart_mcux_irq_err_disable(const struct device *dev)
{
const struct uart_mcux_config *config = dev->config;
uint32_t mask = kUART_NoiseErrorInterruptEnable |
kUART_FramingErrorInterruptEnable |
kUART_ParityErrorInterruptEnable;
UART_DisableInterrupts(config->base, mask);
}
static int uart_mcux_irq_is_pending(const struct device *dev)
{
return uart_mcux_irq_tx_ready(dev) || uart_mcux_irq_rx_pending(dev);
}
static int uart_mcux_irq_update(const struct device *dev)
{
return 1;
}
static void uart_mcux_irq_callback_set(const struct device *dev,
uart_irq_callback_user_data_t cb,
void *cb_data)
{
struct uart_mcux_data *data = dev->data;
data->callback = cb;
data->cb_data = cb_data;
}
static void uart_mcux_isr(const struct device *dev)
{
struct uart_mcux_data *data = dev->data;
if (data->callback) {
data->callback(dev, data->cb_data);
}
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static int uart_mcux_init(const struct device *dev)
{
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
const struct uart_mcux_config *config = dev->config;
#endif
struct uart_mcux_data *data = dev->data;
int err;
err = uart_mcux_configure(dev, &data->uart_cfg);
if (err != 0) {
return err;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
config->irq_config_func(dev);
#endif
return 0;
}
static const struct uart_driver_api uart_mcux_driver_api = {
.poll_in = uart_mcux_poll_in,
.poll_out = uart_mcux_poll_out,
.err_check = uart_mcux_err_check,
#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
.configure = uart_mcux_configure,
.config_get = uart_mcux_config_get,
#endif
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = uart_mcux_fifo_fill,
.fifo_read = uart_mcux_fifo_read,
.irq_tx_enable = uart_mcux_irq_tx_enable,
.irq_tx_disable = uart_mcux_irq_tx_disable,
.irq_tx_complete = uart_mcux_irq_tx_complete,
.irq_tx_ready = uart_mcux_irq_tx_ready,
.irq_rx_enable = uart_mcux_irq_rx_enable,
.irq_rx_disable = uart_mcux_irq_rx_disable,
.irq_rx_ready = uart_mcux_irq_rx_full,
.irq_err_enable = uart_mcux_irq_err_enable,
.irq_err_disable = uart_mcux_irq_err_disable,
.irq_is_pending = uart_mcux_irq_is_pending,
.irq_update = uart_mcux_irq_update,
.irq_callback_set = uart_mcux_irq_callback_set,
#endif
};
#define UART_MCUX_DECLARE_CFG(n, IRQ_FUNC_INIT) \
static const struct uart_mcux_config uart_mcux_##n##_config = { \
.base = (UART_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_FUNC_INIT \
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
#define UART_MCUX_CONFIG_FUNC(n) \
static void uart_mcux_config_func_##n(const struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, status, irq), \
DT_INST_IRQ_BY_NAME(n, status, priority), \
uart_mcux_isr, DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQ_BY_NAME(n, status, irq)); \
\
IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, error, irq), \
DT_INST_IRQ_BY_NAME(n, error, priority), \
uart_mcux_isr, DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQ_BY_NAME(n, error, irq)); \
}
#define UART_MCUX_IRQ_CFG_FUNC_INIT(n) \
.irq_config_func = uart_mcux_config_func_##n
#define UART_MCUX_INIT_CFG(n) \
UART_MCUX_DECLARE_CFG(n, UART_MCUX_IRQ_CFG_FUNC_INIT(n))
#else
#define UART_MCUX_CONFIG_FUNC(n)
#define UART_MCUX_IRQ_CFG_FUNC_INIT
#define UART_MCUX_INIT_CFG(n) \
UART_MCUX_DECLARE_CFG(n, UART_MCUX_IRQ_CFG_FUNC_INIT)
#endif
#define UART_MCUX_INIT(n) \
\
static struct uart_mcux_data uart_mcux_##n##_data = { \
.uart_cfg = { \
.stop_bits = UART_CFG_STOP_BITS_1, \
.data_bits = UART_CFG_DATA_BITS_8, \
.baudrate = DT_INST_PROP(n, current_speed), \
.parity = UART_CFG_PARITY_NONE, \
.flow_ctrl = DT_INST_PROP(n, hw_flow_control) ? \
UART_CFG_FLOW_CTRL_RTS_CTS : UART_CFG_FLOW_CTRL_NONE,\
}, \
}; \
\
static const struct uart_mcux_config uart_mcux_##n##_config; \
\
DEVICE_DT_INST_DEFINE(n, \
&uart_mcux_init, \
NULL, \
&uart_mcux_##n##_data, \
&uart_mcux_##n##_config, \
PRE_KERNEL_1, \
CONFIG_SERIAL_INIT_PRIORITY, \
&uart_mcux_driver_api); \
\
UART_MCUX_CONFIG_FUNC(n) \
\
UART_MCUX_INIT_CFG(n);
DT_INST_FOREACH_STATUS_OKAY(UART_MCUX_INIT)