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drivers: serial: Added support for raspberry pi

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Added a serial driver for the RP2040. Only polling
API is supported.

Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>
This commit is contained in:
Yonatan Schachter 2021-11-30 00:40:43 +02:00 • committed by Carles Cufí
commit cd7bd5f450
7 changed files with 122 additions and 0 deletions
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75
drivers/serial/uart_rpi_pico.c Normal file
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/*
* Copyright (c) 2021, Yonatan Schachter
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <drivers/uart.h>
#include <drivers/pinctrl.h>
/* pico-sdk includes */
#include <hardware/uart.h>
#define DT_DRV_COMPAT raspberrypi_pico_uart
struct uart_rpi_config {
uart_inst_t *const uart_dev;
uint32_t baudrate;
const struct pinctrl_dev_config *pcfg;
};
static int uart_rpi_poll_in(const struct device *dev, unsigned char *c)
{
const struct uart_rpi_config *config = dev->config;
if (!uart_is_readable(config->uart_dev)) {
return -1;
}
*c = (unsigned char)uart_get_hw(config->uart_dev)->dr;
return 0;
}
static void uart_rpi_poll_out(const struct device *dev, unsigned char c)
{
const struct uart_rpi_config *config = dev->config;
uart_putc_raw(config->uart_dev, c);
}
static int uart_rpi_init(const struct device *dev)
{
const struct uart_rpi_config *config = dev->config;
int ret;
ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
if (ret < 0) {
return ret;
}
uart_init(config->uart_dev, config->baudrate);
return 0;
}
static const struct uart_driver_api uart_rpi_driver_api = {
.poll_in = uart_rpi_poll_in,
.poll_out = uart_rpi_poll_out,
};
#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);
DT_INST_FOREACH_STATUS_OKAY(RPI_UART_INIT)