1 /* 2 * Copyright (c) 2022 Trackunit Corporation 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #include <zephyr/kernel.h> 8 #include <zephyr/types.h> 9 #include <zephyr/device.h> 10 #include <zephyr/drivers/uart.h> 11 #include <zephyr/sys/ring_buffer.h> 12 #include <zephyr/sys/atomic.h> 13 14 #include <zephyr/modem/pipe.h> 15 #include <zephyr/modem/stats.h> 16 17 #ifndef ZEPHYR_MODEM_BACKEND_UART_ 18 #define ZEPHYR_MODEM_BACKEND_UART_ 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 struct modem_backend_uart_isr { 25 struct ring_buf receive_rdb[2]; 26 struct ring_buf transmit_rb; 27 atomic_t transmit_buf_len; 28 atomic_t receive_buf_len; 29 uint8_t receive_rdb_used; 30 uint32_t transmit_buf_put_limit; 31 }; 32 33 struct modem_backend_uart_async_common { 34 uint8_t *transmit_buf; 35 uint32_t transmit_buf_size; 36 struct k_work rx_disabled_work; 37 atomic_t state; 38 }; 39 40 #ifdef CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC 41 42 struct rx_queue_event { 43 uint8_t *buf; 44 size_t len; 45 }; 46 47 struct modem_backend_uart_async { 48 struct modem_backend_uart_async_common common; 49 struct k_mem_slab rx_slab; 50 struct k_msgq rx_queue; 51 struct rx_queue_event rx_event; 52 struct rx_queue_event rx_queue_buf[CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC_BUFFER_COUNT]; 53 uint32_t rx_buf_size; 54 uint8_t rx_buf_count; 55 }; 56 57 #else 58 59 struct modem_backend_uart_async { 60 struct modem_backend_uart_async_common common; 61 uint8_t *receive_bufs[2]; 62 uint32_t receive_buf_size; 63 struct ring_buf receive_rb; 64 struct k_spinlock receive_rb_lock; 65 }; 66 67 #endif /* CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC */ 68 69 struct modem_backend_uart { 70 const struct device *uart; 71 const struct gpio_dt_spec *dtr_gpio; 72 struct modem_pipe pipe; 73 struct k_work_delayable receive_ready_work; 74 struct k_work transmit_idle_work; 75 76 #if CONFIG_MODEM_STATS 77 struct modem_stats_buffer receive_buf_stats; 78 struct modem_stats_buffer transmit_buf_stats; 79 #endif 80 81 union { 82 struct modem_backend_uart_isr isr; 83 struct modem_backend_uart_async async; 84 }; 85 }; 86 87 struct modem_backend_uart_config { 88 const struct device *uart; 89 const struct gpio_dt_spec *dtr_gpio; 90 /* Address must be word-aligned when CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC is enabled. */ 91 uint8_t *receive_buf; 92 uint32_t receive_buf_size; 93 uint8_t *transmit_buf; 94 uint32_t transmit_buf_size; 95 }; 96 97 struct modem_pipe *modem_backend_uart_init(struct modem_backend_uart *backend, 98 const struct modem_backend_uart_config *config); 99 100 #ifdef __cplusplus 101 } 102 #endif 103 104 #endif /* ZEPHYR_MODEM_BACKEND_UART_ */ 105
