mctp_uart.h

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/*
 * Copyright (c) 2024 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 */
 
#ifndef ZEPHYR_MCTP_UART_H_
#define ZEPHYR_MCTP_UART_H_
 
#include <stdint.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <libmctp.h>

struct mctp_binding_uart {
        struct mctp_binding binding;
        const struct device *dev;
 
        /* receive buffers and state */
        struct k_sem rx_disabled;
        uint8_t rx_buf[2][256];
        bool rx_buf_used[2];
        struct mctp_pktbuf *rx_pkt;
        uint8_t rx_exp_len;
        uint16_t rx_fcs;
        uint16_t rx_fcs_calc;
        enum {
                STATE_WAIT_SYNC_START,
                STATE_WAIT_REVISION,
                STATE_WAIT_LEN,
                STATE_DATA,
                STATE_DATA_ESCAPED,
                STATE_WAIT_FCS1,
                STATE_WAIT_FCS2,
                STATE_WAIT_SYNC_END,
        } rx_state;
        int rx_res;
 
        /* staging buffer for tx */
        uint8_t tx_buf[256];
        int tx_res;

};

void mctp_uart_start_rx(struct mctp_binding_uart *uart);

int mctp_uart_stop_rx(struct mctp_binding_uart *uart);

int mctp_uart_start(struct mctp_binding *binding);
int mctp_uart_tx(struct mctp_binding *binding, struct mctp_pktbuf *pkt);

#define MCTP_UART_DT_DEFINE(_name, _dev)                                                           \
        struct mctp_binding_uart _name = {                                                         \
                .binding =                                                                         \
                        {                                                                          \
                                .name = STRINGIFY(_name), .version = 1,                            \
                                                  .pkt_size = MCTP_PACKET_SIZE(MCTP_BTU),          \
                                                  .pkt_header = 0, .pkt_trailer = 0,               \
                                                  .start = mctp_uart_start, .tx = mctp_uart_tx,    \
                                },                                                                 \
                                .dev = _dev,                                                       \
                                .rx_state = STATE_WAIT_SYNC_START,                                 \
                                .rx_pkt = NULL,                                                    \
                                .rx_res = 0,                                                       \
                                .tx_res = 0,                                                       \
        };
 
#endif /* ZEPHYR_MCTP_UART_H_ */