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https://github.com/zephyrproject-rtos/zephyr
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1a7eb61f02
Use DEVICE_API macro to place driver API instances into a linker section. Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>
140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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* Copyright (c) 2025 Texas Instruments
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* Copyright (c) 2025 Linumiz
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ti_mspm0_uart
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/* Zephyr includes */
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/clock_control.h>
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#include <zephyr/drivers/clock_control/mspm0_clock_control.h>
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#include <zephyr/drivers/pinctrl.h>
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#include <zephyr/drivers/uart.h>
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#include <zephyr/irq.h>
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/* Driverlib includes */
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#include <ti/driverlib/dl_uart_main.h>
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struct uart_mspm0_config {
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UART_Regs *regs;
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uint32_t current_speed;
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const struct mspm0_sys_clock *clock_subsys;
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const struct pinctrl_dev_config *pinctrl;
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};
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struct uart_mspm0_data {
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/* UART clock structure */
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DL_UART_Main_ClockConfig uart_clockconfig;
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/* UART config structure */
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DL_UART_Main_Config uart_config;
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};
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static int uart_mspm0_init(const struct device *dev)
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{
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const struct uart_mspm0_config *config = dev->config;
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struct uart_mspm0_data *data = dev->data;
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const struct device *clk_dev = DEVICE_DT_GET(DT_NODELABEL(ckm));
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uint32_t clock_rate;
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int ret;
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/* Reset power */
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DL_UART_Main_reset(config->regs);
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DL_UART_Main_enablePower(config->regs);
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delay_cycles(CONFIG_MSPM0_PERIPH_STARTUP_DELAY);
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/* Init UART pins */
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ret = pinctrl_apply_state(config->pinctrl, PINCTRL_STATE_DEFAULT);
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if (ret < 0) {
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return ret;
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}
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/* Set UART configs */
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DL_UART_Main_setClockConfig(config->regs,
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&data->uart_clockconfig);
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DL_UART_Main_init(config->regs, &data->uart_config);
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/*
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* Configure baud rate by setting oversampling and baud rate divisor
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* from the device tree data current-speed
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*/
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ret = clock_control_get_rate(clk_dev,
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(struct mspm0_sys_clock *)config->clock_subsys,
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&clock_rate);
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if (ret < 0) {
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return ret;
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}
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DL_UART_Main_configBaudRate(config->regs,
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clock_rate,
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config->current_speed);
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/* Enable UART */
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DL_UART_Main_enable(config->regs);
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return 0;
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}
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static int uart_mspm0_poll_in(const struct device *dev, unsigned char *c)
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{
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const struct uart_mspm0_config *config = dev->config;
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if (DL_UART_Main_receiveDataCheck(config->regs, c) == false) {
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return -1;
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}
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return 0;
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}
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static void uart_mspm0_poll_out(const struct device *dev, unsigned char c)
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{
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const struct uart_mspm0_config *config = dev->config;
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DL_UART_Main_transmitDataBlocking(config->regs, c);
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}
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static DEVICE_API(uart, uart_mspm0_driver_api) = {
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.poll_in = uart_mspm0_poll_in,
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.poll_out = uart_mspm0_poll_out,
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};
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#define MSPM0_MAIN_CLK_DIV(n) CONCAT(DL_UART_MAIN_CLOCK_DIVIDE_RATIO_, DT_INST_PROP(n, clk_div))
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#define MSPM0_UART_INIT_FN(index) \
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\
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PINCTRL_DT_INST_DEFINE(index); \
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\
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static const struct mspm0_sys_clock mspm0_uart_sys_clock##index = \
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MSPM0_CLOCK_SUBSYS_FN(index); \
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\
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static const struct uart_mspm0_config uart_mspm0_cfg_##index = { \
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.regs = (UART_Regs *)DT_INST_REG_ADDR(index), \
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.current_speed = DT_INST_PROP(index, current_speed), \
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.pinctrl = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \
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.clock_subsys = &mspm0_uart_sys_clock##index, \
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}; \
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\
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static struct uart_mspm0_data uart_mspm0_data_##index = { \
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.uart_clockconfig = { \
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.clockSel = MSPM0_CLOCK_PERIPH_REG_MASK(DT_INST_CLOCKS_CELL(index, clk)), \
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.divideRatio = MSPM0_MAIN_CLK_DIV(index), \
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}, \
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.uart_config = {.mode = DL_UART_MAIN_MODE_NORMAL, \
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.direction = DL_UART_MAIN_DIRECTION_TX_RX, \
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.flowControl = (DT_INST_PROP(index, hw_flow_control) \
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? DL_UART_MAIN_FLOW_CONTROL_RTS_CTS \
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: DL_UART_MAIN_FLOW_CONTROL_NONE), \
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.parity = DL_UART_MAIN_PARITY_NONE, \
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.wordLength = DL_UART_MAIN_WORD_LENGTH_8_BITS, \
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.stopBits = DL_UART_MAIN_STOP_BITS_ONE, \
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}, \
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}; \
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\
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DEVICE_DT_INST_DEFINE(index, &uart_mspm0_init, NULL, &uart_mspm0_data_##index, \
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&uart_mspm0_cfg_##index, PRE_KERNEL_1, \
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CONFIG_SERIAL_INIT_PRIORITY, &uart_mspm0_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(MSPM0_UART_INIT_FN)
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