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zephyr/drivers/serial/uart_si32_usart.c

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/*
* Copyright (c) 2024 GARDENA GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT silabs_si32_usart
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/sys_clock.h>
#include <SI32_CLKCTRL_A_Type.h>
#include <SI32_USART_A_Type.h>
#include <si32_device.h>
struct usart_si32_config {
SI32_USART_A_Type *usart;
bool hw_flow_control;
uint8_t parity;
#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
uart_irq_config_func_t irq_config_func;
#endif
const struct device *clock_dev;
};
struct usart_si32_data {
uint32_t baud_rate;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_user_data_t callback;
void *cb_data;
#endif
};
static int usart_si32_poll_in(const struct device *dev, unsigned char *c)
{
const struct usart_si32_config *config = dev->config;
int ret = -1;
if (SI32_USART_A_read_rx_fifo_count(config->usart) != 0) {
*c = SI32_USART_A_read_data_u8(config->usart);
ret = 0;
}
return ret;
}
static void usart_si32_poll_out(const struct device *dev, unsigned char c)
{
const struct usart_si32_config *config = dev->config;
while (SI32_USART_A_read_tx_fifo_count(config->usart) ||
SI32_USART_A_is_tx_busy(config->usart)) {
/* busy wait */
}
SI32_USART_A_write_data_u8(config->usart, c);
}
static int usart_si32_err_check(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
int ret = 0;
if (SI32_USART_A_is_tx_fifo_error_interrupt_pending(config->usart)) {
SI32_USART_A_clear_tx_fifo_error_interrupt(config->usart);
}
if (SI32_USART_A_is_rx_overrun_interrupt_pending(config->usart)) {
SI32_USART_A_clear_rx_overrun_error_interrupt(config->usart);
ret |= UART_ERROR_OVERRUN;
}
if (SI32_USART_A_is_rx_parity_error_interrupt_pending(config->usart)) {
SI32_USART_A_clear_rx_parity_error_interrupt(config->usart);
ret |= UART_ERROR_PARITY;
}
if (SI32_USART_A_is_rx_frame_error_interrupt_pending(config->usart)) {
SI32_USART_A_clear_rx_frame_error_interrupt(config->usart);
ret |= UART_ERROR_FRAMING;
}
return ret;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int usart_si32_fifo_fill(const struct device *dev, const uint8_t *tx_data, int size)
{
const struct usart_si32_config *config = dev->config;
int i;
/* NOTE: Checking `SI32_USART_A_is_tx_busy` is a workaround.
* For some reason data gets corrupted when writing to the FIFO
* while a write is happening.
*/
for (i = 0; i < size && SI32_USART_A_read_tx_fifo_count(config->usart) == 0 &&
!SI32_USART_A_is_tx_busy(config->usart);
i++) {
SI32_USART_A_write_data_u8(config->usart, tx_data[i]);
}
return i;
}
static int usart_si32_fifo_read(const struct device *dev, uint8_t *rx_data, const int size)
{
const struct usart_si32_config *config = dev->config;
int i;
for (i = 0; i < size; i++) {
if (!SI32_USART_A_read_rx_fifo_count(config->usart)) {
break;
}
rx_data[i] = SI32_USART_A_read_data_u8(config->usart);
}
return i;
}
static void usart_si32_irq_tx_enable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_enable_tx_data_request_interrupt(config->usart);
}
static void usart_si32_irq_tx_disable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_disable_tx_data_request_interrupt(config->usart);
}
static int usart_si32_irq_tx_ready(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
return SI32_USART_A_is_tx_data_request_interrupt_pending(config->usart);
}
static int usart_si32_irq_tx_complete(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
return SI32_USART_A_is_tx_complete(config->usart);
}
static void usart_si32_irq_rx_enable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_enable_rx_data_request_interrupt(config->usart);
}
static void usart_si32_irq_rx_disable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_disable_rx_data_request_interrupt(config->usart);
}
static int usart_si32_irq_rx_ready(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
return SI32_USART_A_is_rx_data_request_interrupt_pending(config->usart);
}
static void usart_si32_irq_err_enable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_enable_rx_error_interrupts(config->usart);
SI32_USART_A_enable_tx_error_interrupts(config->usart);
}
static void usart_si32_irq_err_disable(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
SI32_USART_A_disable_rx_error_interrupts(config->usart);
SI32_USART_A_disable_tx_error_interrupts(config->usart);
}
static int usart_si32_irq_is_pending(const struct device *dev)
{
return usart_si32_irq_rx_ready(dev) || usart_si32_irq_tx_ready(dev);
}
static int usart_si32_irq_update(const struct device *dev)
{
ARG_UNUSED(dev);
return 1;
}
static void usart_si32_irq_callback_set(const struct device *dev, uart_irq_callback_user_data_t cb,
void *cb_data)
{
struct usart_si32_data *data = dev->data;
data->callback = cb;
data->cb_data = cb_data;
}
static void usart_si32_irq_handler(const struct device *dev)
{
struct usart_si32_data *data = dev->data;
if (data->callback) {
data->callback(dev, data->cb_data);
}
usart_si32_err_check(dev);
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static const struct uart_driver_api usart_si32_driver_api = {
.poll_in = usart_si32_poll_in,
.poll_out = usart_si32_poll_out,
.err_check = usart_si32_err_check,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = usart_si32_fifo_fill,
.fifo_read = usart_si32_fifo_read,
.irq_tx_enable = usart_si32_irq_tx_enable,
.irq_tx_disable = usart_si32_irq_tx_disable,
.irq_tx_ready = usart_si32_irq_tx_ready,
.irq_tx_complete = usart_si32_irq_tx_complete,
.irq_rx_enable = usart_si32_irq_rx_enable,
.irq_rx_disable = usart_si32_irq_rx_disable,
.irq_rx_ready = usart_si32_irq_rx_ready,
.irq_err_enable = usart_si32_irq_err_enable,
.irq_err_disable = usart_si32_irq_err_disable,
.irq_is_pending = usart_si32_irq_is_pending,
.irq_update = usart_si32_irq_update,
.irq_callback_set = usart_si32_irq_callback_set,
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
static int usart_si32_init(const struct device *dev)
{
const struct usart_si32_config *config = dev->config;
struct usart_si32_data *data = dev->data;
uint32_t apb_freq;
uint32_t baud_register_value;
int ret;
enum SI32_USART_A_PARITY_Enum parity = SI32_USART_A_PARITY_ODD;
bool parity_enabled;
if (!device_is_ready(config->clock_dev)) {
return -ENODEV;
}
ret = clock_control_get_rate(config->clock_dev, NULL, &apb_freq);
if (ret) {
return ret;
}
switch (config->parity) {
case UART_CFG_PARITY_NONE:
parity_enabled = false;
break;
case UART_CFG_PARITY_ODD:
parity = SI32_USART_A_PARITY_ODD;
parity_enabled = true;
break;
case UART_CFG_PARITY_EVEN:
parity = SI32_USART_A_PARITY_EVEN;
parity_enabled = true;
break;
case UART_CFG_PARITY_MARK:
parity = SI32_USART_A_PARITY_SET;
parity_enabled = true;
break;
case UART_CFG_PARITY_SPACE:
parity = SI32_USART_A_PARITY_CLEAR;
parity_enabled = true;
break;
default:
return -ENOTSUP;
}
if (config->usart == SI32_USART_0) {
SI32_CLKCTRL_A_enable_apb_to_modules_0(SI32_CLKCTRL_0,
SI32_CLKCTRL_A_APBCLKG0_USART0);
} else if (config->usart == SI32_USART_1) {
SI32_CLKCTRL_A_enable_apb_to_modules_0(SI32_CLKCTRL_0,
SI32_CLKCTRL_A_APBCLKG0_USART1);
} else {
return -ENOTSUP;
}
baud_register_value = (apb_freq / (2 * data->baud_rate)) - 1;
SI32_USART_A_exit_loopback_mode(config->usart);
if (config->hw_flow_control) {
SI32_USART_A_enable_rts(config->usart);
SI32_USART_A_select_rts_deassert_on_byte_free(config->usart);
SI32_USART_A_disable_rts_inversion(config->usart);
SI32_USART_A_enable_cts(config->usart);
SI32_USART_A_disable_cts_inversion(config->usart);
}
/* Transmitter */
if (parity_enabled) {
SI32_USART_A_select_tx_parity(config->usart, parity);
SI32_USART_A_enable_tx_parity_bit(config->usart);
} else {
SI32_USART_A_disable_tx_parity_bit(config->usart);
}
SI32_USART_A_select_tx_data_length(config->usart, SI32_USART_A_DATA_LENGTH_8_BITS);
SI32_USART_A_enable_tx_start_bit(config->usart);
SI32_USART_A_enable_tx_stop_bit(config->usart);
SI32_USART_A_select_tx_stop_bits(config->usart, SI32_USART_A_STOP_BITS_1_BIT);
SI32_USART_A_set_tx_baudrate(config->usart, (uint16_t)baud_register_value);
SI32_USART_A_select_tx_asynchronous_mode(config->usart);
SI32_USART_A_disable_tx_signal_inversion(config->usart);
SI32_USART_A_select_tx_fifo_threshold_for_request_to_1(config->usart);
SI32_USART_A_enable_tx(config->usart);
/* Receiver */
if (parity_enabled) {
SI32_USART_A_select_rx_parity(config->usart, parity);
SI32_USART_A_enable_rx_parity_bit(config->usart);
} else {
SI32_USART_A_disable_rx_parity_bit(config->usart);
}
SI32_USART_A_select_rx_data_length(config->usart, SI32_USART_A_DATA_LENGTH_8_BITS);
SI32_USART_A_enable_rx_start_bit(config->usart);
SI32_USART_A_enable_rx_stop_bit(config->usart);
SI32_USART_A_select_rx_stop_bits(config->usart, SI32_USART_A_STOP_BITS_1_BIT);
SI32_USART_A_set_rx_baudrate(config->usart, (uint16_t)baud_register_value);
SI32_USART_A_select_rx_asynchronous_mode(config->usart);
SI32_USART_A_disable_rx_signal_inversion(config->usart);
SI32_USART_A_select_rx_fifo_threshold_1(config->usart);
SI32_USART_A_enable_rx(config->usart);
SI32_USART_A_flush_tx_fifo(config->usart);
SI32_USART_A_flush_rx_fifo(config->usart);
#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
config->irq_config_func(dev);
#endif
return 0;
}
#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
#define SI32_USART_IRQ_HANDLER_DECL(index) \
static void usart_si32_irq_config_func_##index(const struct device *dev);
#define SI32_USART_IRQ_HANDLER(index) \
static void usart_si32_irq_config_func_##index(const struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQN(index), DT_INST_IRQ(index, priority), \
usart_si32_irq_handler, DEVICE_DT_INST_GET(index), 0); \
irq_enable(DT_INST_IRQN(index)); \
}
#else
#define SI32_USART_IRQ_HANDLER_DECL(index) /* Not used */
#define SI32_USART_IRQ_HANDLER(index) /* Not used */
#endif
#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
#define SI32_USART_IRQ_HANDLER_FUNC(index) .irq_config_func = usart_si32_irq_config_func_##index,
#else
#define SI32_USART_IRQ_HANDLER_FUNC(index) /* Not used */
#endif
#define SI32_USART_INIT(index) \
SI32_USART_IRQ_HANDLER_DECL(index) \
\
static const struct usart_si32_config usart_si32_cfg_##index = { \
.usart = (SI32_USART_A_Type *)DT_INST_REG_ADDR(index), \
.hw_flow_control = DT_INST_PROP(index, hw_flow_control), \
.parity = DT_INST_ENUM_IDX_OR(index, parity, UART_CFG_PARITY_NONE), \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(index)), \
SI32_USART_IRQ_HANDLER_FUNC(index)}; \
\
static struct usart_si32_data usart_si32_data_##index = { \
.baud_rate = DT_INST_PROP(index, current_speed), \
}; \
\
DEVICE_DT_INST_DEFINE(index, &usart_si32_init, NULL, &usart_si32_data_##index, \
&usart_si32_cfg_##index, PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, \
&usart_si32_driver_api); \
\
SI32_USART_IRQ_HANDLER(index)
DT_INST_FOREACH_STATUS_OKAY(SI32_USART_INIT)
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