280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
/*
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* Copyright (c) 2022 Libre Solar Technologies GmbH
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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 espressif_esp32_usb_serial
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#include <hal/usb_serial_jtag_ll.h>
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <errno.h>
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#include <soc.h>
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#include <zephyr/drivers/uart.h>
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#if defined(CONFIG_SOC_SERIES_ESP32C3) || defined(CONFIG_SOC_SERIES_ESP32C6)
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#include <zephyr/drivers/interrupt_controller/intc_esp32c3.h>
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#else
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#include <zephyr/drivers/interrupt_controller/intc_esp32.h>
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#endif
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#include <zephyr/drivers/clock_control.h>
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#include <zephyr/sys/util.h>
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#include <esp_attr.h>
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#if defined(CONFIG_SOC_SERIES_ESP32C3) || defined(CONFIG_SOC_SERIES_ESP32C6)
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#define ISR_HANDLER isr_handler_t
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#else
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#define ISR_HANDLER intr_handler_t
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#endif
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/*
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* Timeout after which the poll_out function stops waiting for space in the tx fifo.
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*
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* Without this timeout, the function would get stuck forever and block the processor if no host is
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* connected to the USB port.
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*
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* USB full-speed uses a frame rate of 1 ms. Thus, a timeout of 50 ms provides plenty of safety
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* margin even for a loaded bus. This is the same value as used in the ESP-IDF.
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*/
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#define USBSERIAL_POLL_OUT_TIMEOUT_MS (50U)
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struct serial_esp32_usb_config {
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const struct device *clock_dev;
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const clock_control_subsys_t clock_subsys;
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int irq_source;
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};
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struct serial_esp32_usb_data {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t irq_cb;
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void *irq_cb_data;
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#endif
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int irq_line;
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int64_t last_tx_time;
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};
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void serial_esp32_usb_isr(void *arg);
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#endif
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static int serial_esp32_usb_poll_in(const struct device *dev, unsigned char *p_char)
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{
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struct serial_esp32_usb_data *data = dev->data;
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if (!usb_serial_jtag_ll_rxfifo_data_available()) {
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return -1;
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}
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usb_serial_jtag_ll_read_rxfifo(p_char, 1);
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return 0;
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}
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static void serial_esp32_usb_poll_out(const struct device *dev, unsigned char c)
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{
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struct serial_esp32_usb_data *data = dev->data;
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/*
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* If there is no USB host connected, this function will busy-wait once for the timeout
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* period, but return immediately for subsequent calls.
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*/
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do {
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if (usb_serial_jtag_ll_txfifo_writable()) {
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usb_serial_jtag_ll_write_txfifo(&c, 1);
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usb_serial_jtag_ll_txfifo_flush();
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data->last_tx_time = k_uptime_get();
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return;
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}
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} while ((k_uptime_get() - data->last_tx_time) < USBSERIAL_POLL_OUT_TIMEOUT_MS);
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}
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static int serial_esp32_usb_err_check(const struct device *dev)
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{
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ARG_UNUSED(dev);
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return 0;
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}
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static int serial_esp32_usb_init(const struct device *dev)
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{
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const struct serial_esp32_usb_config *config = dev->config;
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struct serial_esp32_usb_data *data = dev->data;
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if (!device_is_ready(config->clock_dev)) {
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return -ENODEV;
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}
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int ret = clock_control_on(config->clock_dev, config->clock_subsys);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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data->irq_line = esp_intr_alloc(config->irq_source, 0, (ISR_HANDLER)serial_esp32_usb_isr,
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(void *)dev, NULL);
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#endif
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return ret;
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int serial_esp32_usb_fifo_fill(const struct device *dev, const uint8_t *tx_data, int len)
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{
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ARG_UNUSED(dev);
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int ret = usb_serial_jtag_ll_write_txfifo(tx_data, len);
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usb_serial_jtag_ll_txfifo_flush();
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return ret;
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}
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static int serial_esp32_usb_fifo_read(const struct device *dev, uint8_t *rx_data, const int len)
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{
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ARG_UNUSED(dev);
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return usb_serial_jtag_ll_read_rxfifo(rx_data, len);
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}
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static void serial_esp32_usb_irq_tx_enable(const struct device *dev)
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{
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struct serial_esp32_usb_data *data = dev->data;
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY);
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usb_serial_jtag_ll_ena_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY);
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if (data->irq_cb != NULL) {
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unsigned int key = irq_lock();
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data->irq_cb(dev, data->irq_cb_data);
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arch_irq_unlock(key);
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}
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}
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static void serial_esp32_usb_irq_tx_disable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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usb_serial_jtag_ll_disable_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY);
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}
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static int serial_esp32_usb_irq_tx_ready(const struct device *dev)
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{
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ARG_UNUSED(dev);
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return (usb_serial_jtag_ll_txfifo_writable() &&
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usb_serial_jtag_ll_get_intr_ena_status() & USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY);
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}
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static void serial_esp32_usb_irq_rx_enable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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usb_serial_jtag_ll_ena_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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}
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static void serial_esp32_usb_irq_rx_disable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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usb_serial_jtag_ll_disable_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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}
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static int serial_esp32_usb_irq_tx_complete(const struct device *dev)
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{
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ARG_UNUSED(dev);
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return usb_serial_jtag_ll_txfifo_writable();
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}
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static int serial_esp32_usb_irq_rx_ready(const struct device *dev)
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{
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ARG_UNUSED(dev);
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return usb_serial_jtag_ll_rxfifo_data_available();
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}
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static void serial_esp32_usb_irq_err_enable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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}
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static void serial_esp32_usb_irq_err_disable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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}
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static int serial_esp32_usb_irq_is_pending(const struct device *dev)
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{
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return serial_esp32_usb_irq_rx_ready(dev) || serial_esp32_usb_irq_tx_ready(dev);
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}
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static int serial_esp32_usb_irq_update(const struct device *dev)
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{
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ARG_UNUSED(dev);
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY);
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return 1;
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}
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static void serial_esp32_usb_irq_callback_set(const struct device *dev,
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uart_irq_callback_user_data_t cb, void *cb_data)
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{
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struct serial_esp32_usb_data *data = dev->data;
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data->irq_cb_data = cb_data;
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data->irq_cb = cb;
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}
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static void serial_esp32_usb_isr(void *arg)
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{
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const struct device *dev = (const struct device *)arg;
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struct serial_esp32_usb_data *data = dev->data;
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uint32_t uart_intr_status = usb_serial_jtag_ll_get_intsts_mask();
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if (uart_intr_status == 0) {
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return;
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}
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usb_serial_jtag_ll_clr_intsts_mask(uart_intr_status);
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if (data->irq_cb != NULL) {
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data->irq_cb(dev, data->irq_cb_data);
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}
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const DRAM_ATTR struct uart_driver_api serial_esp32_usb_api = {
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.poll_in = serial_esp32_usb_poll_in,
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.poll_out = serial_esp32_usb_poll_out,
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.err_check = serial_esp32_usb_err_check,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = serial_esp32_usb_fifo_fill,
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.fifo_read = serial_esp32_usb_fifo_read,
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.irq_tx_enable = serial_esp32_usb_irq_tx_enable,
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.irq_tx_disable = serial_esp32_usb_irq_tx_disable,
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.irq_tx_ready = serial_esp32_usb_irq_tx_ready,
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.irq_rx_enable = serial_esp32_usb_irq_rx_enable,
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.irq_rx_disable = serial_esp32_usb_irq_rx_disable,
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.irq_tx_complete = serial_esp32_usb_irq_tx_complete,
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.irq_rx_ready = serial_esp32_usb_irq_rx_ready,
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.irq_err_enable = serial_esp32_usb_irq_err_enable,
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.irq_err_disable = serial_esp32_usb_irq_err_disable,
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.irq_is_pending = serial_esp32_usb_irq_is_pending,
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.irq_update = serial_esp32_usb_irq_update,
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.irq_callback_set = serial_esp32_usb_irq_callback_set,
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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};
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static const DRAM_ATTR struct serial_esp32_usb_config serial_esp32_usb_cfg = {
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.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(0)),
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.clock_subsys = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(0, offset),
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.irq_source = DT_INST_IRQN(0)
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};
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static struct serial_esp32_usb_data serial_esp32_usb_data_0;
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DEVICE_DT_INST_DEFINE(0, serial_esp32_usb_init, NULL, &serial_esp32_usb_data_0,
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&serial_esp32_usb_cfg, PRE_KERNEL_1,
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CONFIG_SERIAL_INIT_PRIORITY, &serial_esp32_usb_api);
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