drivers: serial: added UART interrupts for Raspberry Pi Pico board

added UART interrupts driver for Raspberry Pi Pico board
moved baudrate from config to data structure

Signed-off-by: Andrei-Edward Popa <andrei_edward.popa@upb.ro>
This commit is contained in:
Andrei-Edward Popa 2022-02-03 14:46:52 +02:00 committed by Anas Nashif
commit 5e8b0723e2
2 changed files with 242 additions and 15 deletions

View file

@ -9,3 +9,4 @@ config UART_RPI_PICO
default $(dt_compat_enabled,$(DT_COMPAT_RPI_PICO_UART))
select SERIAL_HAS_DRIVER
select PICOSDK_USE_UART
select SERIAL_SUPPORT_INTERRUPT

View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Yonatan Schachter
* Copyright (c) 2022, Andrei-Edward Popa
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -14,8 +15,19 @@
struct uart_rpi_config {
uart_inst_t *const uart_dev;
uint32_t baudrate;
uart_hw_t *const uart_regs;
const struct pinctrl_dev_config *pcfg;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_config_func_t irq_config_func;
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
struct uart_rpi_data {
uint32_t baudrate;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_user_data_t irq_cb;
void *irq_cb_data;
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
static int uart_rpi_poll_in(const struct device *dev, unsigned char *c)
@ -56,27 +68,241 @@ static int uart_rpi_init(const struct device *dev)
return -EINVAL;
}
hw_clear_bits(&uart_hw->lcr_h, UART_UARTLCR_H_FEN_BITS);
uart_hw->dr = 0U;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
config->irq_config_func(dev);
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
return 0;
}
static int uart_rpi_err_check(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uint32_t data_reg = uart_hw->dr;
int errors = 0;
if (data_reg & UART_UARTDR_OE_BITS) {
errors |= UART_ERROR_OVERRUN;
}
if (data_reg & UART_UARTDR_BE_BITS) {
errors |= UART_BREAK;
}
if (data_reg & UART_UARTDR_PE_BITS) {
errors |= UART_ERROR_PARITY;
}
if (data_reg & UART_UARTDR_FE_BITS) {
errors |= UART_ERROR_FRAMING;
}
return errors;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int uart_rpi_fifo_fill(const struct device *dev,
const uint8_t *tx_data, int len)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
int tx_len = 0;
while (!(uart_hw->fr & UART_UARTFR_TXFF_BITS) && (len - tx_len) > 0) {
uart_hw->dr = tx_data[tx_len++];
}
return tx_len;
}
static int uart_rpi_fifo_read(const struct device *dev,
uint8_t *rx_data, const int len)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
int rx_len = 0;
while (!(uart_hw->fr & UART_UARTFR_RXFE_BITS) && (len - rx_len) > 0) {
rx_data[rx_len++] = (uint8_t)uart_hw->dr;
}
return rx_len;
}
static void uart_rpi_irq_tx_enable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc |= UART_UARTIMSC_TXIM_BITS;
uart_hw->ifls &= ~UART_UARTIFLS_TXIFLSEL_BITS;
}
static void uart_rpi_irq_tx_disable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc &= ~UART_UARTIMSC_TXIM_BITS;
}
static int uart_rpi_irq_tx_ready(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
return (uart_hw->mis & UART_UARTMIS_TXMIS_BITS) == UART_UARTMIS_TXMIS_BITS;
}
static void uart_rpi_irq_rx_enable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc |= UART_UARTIMSC_RXIM_BITS;
uart_hw->ifls &= ~UART_UARTIFLS_RXIFLSEL_BITS;
}
static void uart_rpi_irq_rx_disable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc &= ~UART_UARTIMSC_RXIM_BITS;
}
static int uart_rpi_irq_tx_complete(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
return !!(uart_hw->fr & UART_UARTFR_TXFE_BITS);
}
static int uart_rpi_irq_rx_ready(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
return (uart_hw->mis & UART_UARTMIS_RXMIS_BITS) == UART_UARTMIS_RXMIS_BITS;
}
static void uart_rpi_irq_err_enable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc |= (UART_UARTIMSC_OEIM_BITS |
UART_UARTIMSC_BEIM_BITS |
UART_UARTIMSC_PEIM_BITS |
UART_UARTIMSC_FEIM_BITS |
UART_UARTIMSC_RTIM_BITS);
}
static void uart_rpi_irq_err_disable(const struct device *dev)
{
const struct uart_rpi_config * const config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_hw->imsc &= ~(UART_UARTIMSC_OEIM_BITS |
UART_UARTIMSC_BEIM_BITS |
UART_UARTIMSC_PEIM_BITS |
UART_UARTIMSC_FEIM_BITS |
UART_UARTIMSC_RTIM_BITS);
}
static int uart_rpi_irq_is_pending(const struct device *dev)
{
return !!(uart_rpi_irq_rx_ready(dev) || uart_rpi_irq_tx_ready(dev));
}
static int uart_rpi_irq_update(const struct device *dev)
{
return 1;
}
static void uart_rpi_irq_callback_set(const struct device *dev,
uart_irq_callback_user_data_t cb,
void *cb_data)
{
struct uart_rpi_data * const data = dev->data;
data->irq_cb = cb;
data->irq_cb_data = cb_data;
}
static void uart_rpi_isr(const struct device *dev)
{
struct uart_rpi_data * const data = dev->data;
if (data->irq_cb) {
data->irq_cb(dev, data->irq_cb_data);
}
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static const struct uart_driver_api uart_rpi_driver_api = {
.poll_in = uart_rpi_poll_in,
.poll_out = uart_rpi_poll_out,
.err_check = uart_rpi_err_check,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = uart_rpi_fifo_fill,
.fifo_read = uart_rpi_fifo_read,
.irq_tx_enable = uart_rpi_irq_tx_enable,
.irq_tx_disable = uart_rpi_irq_tx_disable,
.irq_tx_ready = uart_rpi_irq_tx_ready,
.irq_rx_enable = uart_rpi_irq_rx_enable,
.irq_rx_disable = uart_rpi_irq_rx_disable,
.irq_tx_complete = uart_rpi_irq_tx_complete,
.irq_rx_ready = uart_rpi_irq_rx_ready,
.irq_err_enable = uart_rpi_irq_err_enable,
.irq_err_disable = uart_rpi_irq_err_disable,
.irq_is_pending = uart_rpi_irq_is_pending,
.irq_update = uart_rpi_irq_update,
.irq_callback_set = uart_rpi_irq_callback_set,
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
#define RPI_UART_INIT(idx) \
PINCTRL_DT_INST_DEFINE(idx); \
static const struct uart_rpi_config uart_rpi_cfg_##idx = { \
.uart_dev = (uart_inst_t *)DT_INST_REG_ADDR(idx), \
.baudrate = DT_INST_PROP(idx, current_speed), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
}; \
\
DEVICE_DT_INST_DEFINE(idx, &uart_rpi_init, \
NULL, \
NULL, \
&uart_rpi_cfg_##idx, PRE_KERNEL_1, \
CONFIG_SERIAL_INIT_PRIORITY, \
&uart_rpi_driver_api);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
#define RPI_UART_IRQ_CONFIG_INIT(idx) \
.irq_config_func = uart##idx##_rpi_irq_config_func
#else
#define RPI_UART_IRQ_CONFIG_INIT(idx)
#endif /* CONFIG_UART_INTERRUPT_DRIVEN*/
#define RPI_UART_INIT(idx) \
PINCTRL_DT_INST_DEFINE(idx); \
\
static void uart##idx##_rpi_irq_config_func(const struct device *port) \
{ \
IRQ_CONNECT(DT_INST_IRQN(idx), \
DT_INST_IRQ(idx, priority), \
uart_rpi_isr, \
DEVICE_DT_INST_GET(idx), 0); \
irq_enable(DT_INST_IRQN(idx)); \
} \
\
static const struct uart_rpi_config uart##idx##_rpi_config = { \
.uart_dev = uart##idx, \
.uart_regs = (uart_hw_t *)uart##idx, \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
RPI_UART_IRQ_CONFIG_INIT(idx), \
}; \
\
static struct uart_rpi_data uart##idx##_rpi_data = { \
.baudrate = DT_INST_PROP(idx, current_speed), \
}; \
\
DEVICE_DT_INST_DEFINE(idx, &uart_rpi_init, \
NULL, &uart##idx##_rpi_data, \
&uart##idx##_rpi_config, PRE_KERNEL_1, \
CONFIG_SERIAL_INIT_PRIORITY, \
&uart_rpi_driver_api); \
DT_INST_FOREACH_STATUS_OKAY(RPI_UART_INIT)