531915deda
Add Bouffalo Lab serial driver. The driver uses pinctrl to configure pins and have power management capabilities. Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* Copyright (c) 2021-2025 ATL Electronics
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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 bflb_uart
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/**
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* @brief UART driver for Bouffalo Lab MCU family.
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*/
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#include <zephyr/drivers/uart.h>
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#include <zephyr/drivers/pinctrl.h>
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#include <zephyr/pm/device.h>
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#include <soc.h>
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#include <bflb_pinctrl.h>
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#include <bflb_uart.h>
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#include <bflb_glb.h>
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#define UART_CTS_FLOWCONTROL_ENABLE (0)
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#define UART_RTS_FLOWCONTROL_ENABLE (0)
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#define UART_MSB_FIRST_ENABLE (0)
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#define UART_DEFAULT_RTO_TIMEOUT (255)
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#define UART_CLOCK_DIV (0)
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struct blfb_config {
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const struct pinctrl_dev_config *pinctrl_cfg;
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uint32_t periph_id;
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UART_CFG_Type uart_cfg;
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UART_FifoCfg_Type fifo_cfg;
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};
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static int uart_blfb_init(const struct device *dev)
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{
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const struct blfb_config *cfg = dev->config;
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pinctrl_apply_state(cfg->pinctrl_cfg, PINCTRL_STATE_DEFAULT);
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GLB_Set_UART_CLK(1, HBN_UART_CLK_160M, UART_CLOCK_DIV);
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UART_IntMask(cfg->periph_id, UART_INT_ALL, 1);
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UART_Disable(cfg->periph_id, UART_TXRX);
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UART_Init(cfg->periph_id, (UART_CFG_Type *)&cfg->uart_cfg);
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UART_TxFreeRun(cfg->periph_id, 1);
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UART_SetRxTimeoutValue(cfg->periph_id, UART_DEFAULT_RTO_TIMEOUT);
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UART_FifoConfig(cfg->periph_id, (UART_FifoCfg_Type *)&cfg->fifo_cfg);
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UART_Enable(cfg->periph_id, UART_TXRX);
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return 0;
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}
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static int uart_blfb_poll_in(const struct device *dev, unsigned char *c)
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{
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const struct blfb_config *cfg = dev->config;
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return UART_ReceiveData(cfg->periph_id, (uint8_t *)c, 1) ? 0 : -1;
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}
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static void uart_blfb_poll_out(const struct device *dev, unsigned char c)
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{
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const struct blfb_config *cfg = dev->config;
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while (UART_GetTxFifoCount(cfg->periph_id) == 0) {
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;
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}
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(void)UART_SendData(cfg->periph_id, (uint8_t *)&c, 1);
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}
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#ifdef CONFIG_PM_DEVICE
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static int uart_blfb_pm_control(const struct device *dev,
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enum pm_device_action action)
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{
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const struct blfb_config *cfg = dev->config;
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switch (action) {
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case PM_DEVICE_ACTION_RESUME:
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(void)pinctrl_apply_state(cfg->pinctrl_cfg, PINCTRL_STATE_DEFAULT);
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UART_Enable(cfg->periph_id, UART_TXRX);
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break;
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case PM_DEVICE_ACTION_SUSPEND:
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if (pinctrl_apply_state(cfg->pinctrl_cfg, PINCTRL_STATE_SLEEP)) {
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return -ENOTSUP;
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}
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UART_Disable(cfg->periph_id, UART_TXRX);
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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#endif /* CONFIG_PM_DEVICE */
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static DEVICE_API(uart, uart_blfb_driver_api) = {
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.poll_in = uart_blfb_poll_in,
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.poll_out = uart_blfb_poll_out,
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};
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#define BLFB_UART_INIT(n) \
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PINCTRL_DT_INST_DEFINE(n); \
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PM_DEVICE_DT_INST_DEFINE(n, uart_blfb_pm_control); \
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static const struct blfb_config blfb_uart##n##_config = { \
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.pinctrl_cfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
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.periph_id = DT_INST_PROP(n, peripheral_id), \
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\
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.uart_cfg.baudRate = DT_INST_PROP(n, current_speed), \
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.uart_cfg.dataBits = UART_DATABITS_8, \
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.uart_cfg.stopBits = UART_STOPBITS_1, \
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.uart_cfg.parity = UART_PARITY_NONE, \
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.uart_cfg.uartClk = SOC_BOUFFALOLAB_BL_PLL160_FREQ_HZ, \
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.uart_cfg.ctsFlowControl = UART_CTS_FLOWCONTROL_ENABLE, \
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.uart_cfg.rtsSoftwareControl = UART_RTS_FLOWCONTROL_ENABLE, \
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.uart_cfg.byteBitInverse = UART_MSB_FIRST_ENABLE, \
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\
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.fifo_cfg.txFifoDmaThreshold = 1, \
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.fifo_cfg.rxFifoDmaThreshold = 1, \
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.fifo_cfg.txFifoDmaEnable = 0, \
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.fifo_cfg.rxFifoDmaEnable = 0, \
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}; \
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DEVICE_DT_INST_DEFINE(n, &uart_blfb_init, \
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PM_DEVICE_DT_INST_GET(n), \
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NULL, \
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&blfb_uart##n##_config, PRE_KERNEL_1, \
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
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&uart_blfb_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(BLFB_UART_INIT)
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