Line data    Source code

       1            0 : /*
       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            0 : #define ZEPHYR_MODEM_BACKEND_UART_
      19              : 
      20              : #ifdef __cplusplus
      21              : extern "C" {
      22              : #endif
      23              : 
      24            0 : struct modem_backend_uart_isr {
      25            0 :         struct ring_buf receive_rdb[2];
      26            0 :         struct ring_buf transmit_rb;
      27            0 :         atomic_t transmit_buf_len;
      28            0 :         atomic_t receive_buf_len;
      29            0 :         uint8_t receive_rdb_used;
      30            0 :         uint32_t transmit_buf_put_limit;
      31              : };
      32              : 
      33            0 : struct modem_backend_uart_async_common {
      34            0 :         uint8_t *transmit_buf;
      35            0 :         uint32_t transmit_buf_size;
      36            0 :         struct k_work rx_disabled_work;
      37            0 :         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            0 : struct modem_backend_uart_async {
      60            0 :         struct modem_backend_uart_async_common common;
      61            0 :         uint8_t *receive_bufs[2];
      62            0 :         uint32_t receive_buf_size;
      63            0 :         struct ring_buf receive_rb;
      64            0 :         struct k_spinlock receive_rb_lock;
      65              : };
      66              : 
      67              : #endif /* CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC */
      68              : 
      69            0 : struct modem_backend_uart {
      70            0 :         const struct device *uart;
      71            0 :         struct modem_pipe pipe;
      72            0 :         struct k_work_delayable receive_ready_work;
      73            0 :         struct k_work transmit_idle_work;
      74              : 
      75              : #if CONFIG_MODEM_STATS
      76              :         struct modem_stats_buffer receive_buf_stats;
      77              :         struct modem_stats_buffer transmit_buf_stats;
      78              : #endif
      79              : 
      80              :         union {
      81            0 :                 struct modem_backend_uart_isr isr;
      82            0 :                 struct modem_backend_uart_async async;
      83            0 :         };
      84              : };
      85              : 
      86            0 : struct modem_backend_uart_config {
      87            0 :         const struct device *uart;
      88              :         /* Address must be word-aligned when CONFIG_MODEM_BACKEND_UART_ASYNC_HWFC is enabled. */
      89            0 :         uint8_t *receive_buf;
      90            0 :         uint32_t receive_buf_size;
      91            0 :         uint8_t *transmit_buf;
      92            0 :         uint32_t transmit_buf_size;
      93              : };
      94              : 
      95            0 : struct modem_pipe *modem_backend_uart_init(struct modem_backend_uart *backend,
      96              :                                            const struct modem_backend_uart_config *config);
      97              : 
      98              : #ifdef __cplusplus
      99              : }
     100              : #endif
     101              : 
     102              : #endif /* ZEPHYR_MODEM_BACKEND_UART_ */