OVMS3-idf/components/ethernet/emac_main.c

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <stdio.h>
#include <string.h>

#include "rom/ets_sys.h"
#include "rom/gpio.h"
#include "soc/dport_reg.h"
#include "soc/io_mux_reg.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/gpio_reg.h"
#include "soc/dport_reg.h"
#include "soc/emac_ex_reg.h"
#include "soc/emac_reg_v2.h"
#include "soc/soc.h"

#include "tcpip_adapter.h"
#include "sdkconfig.h"

#include "esp_task_wdt.h"
#include "esp_event.h"
#include "esp_system.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_eth.h"

#include "emac_common.h"
#include "emac_desc.h"

#include "freertos/xtensa_api.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"

#define EMAC_EVT_QNUM 200
#define EMAC_SIG_MAX 50

static struct emac_config_data emac_config;

static uint8_t emac_dma_rx_chain_buf[32 * DMA_RX_BUF_NUM];
static uint8_t emac_dma_tx_chain_buf[32 * DMA_TX_BUF_NUM];
static uint8_t emac_dma_rx_buf[DMA_RX_BUF_SIZE * DMA_RX_BUF_NUM];
static uint8_t emac_dma_tx_buf[DMA_TX_BUF_SIZE * DMA_TX_BUF_NUM];

static SemaphoreHandle_t emac_g_sem;
static portMUX_TYPE g_emac_mux = portMUX_INITIALIZER_UNLOCKED;
static xTaskHandle emac_task_hdl;
static xQueueHandle emac_xqueue;
static uint8_t emac_sig_cnt[EMAC_SIG_MAX] = {0};
static TimerHandle_t emac_timer = NULL;

static const char *TAG = "emac";

static esp_err_t emac_ioctl(emac_sig_t sig, emac_par_t par);
esp_err_t emac_post(emac_sig_t sig, emac_par_t par);

static void emac_macaddr_init(void)
{
    esp_efuse_read_mac(&(emac_config.macaddr[0]));
    emac_config.macaddr[5] = emac_config.macaddr[5] + 3;
}

void esp_eth_get_mac(uint8_t mac[6])
{
    memcpy(mac, &(emac_config.macaddr[0]), 6);
}

static void emac_setup_tx_desc(struct dma_extended_desc *tx_desc , uint32_t size)
{
    tx_desc->basic.desc0 = EMAC_DESC_TX_OWN | EMAC_DESC_INT_COMPL | EMAC_DESC_LAST_SEGMENT | EMAC_DESC_FIRST_SEGMENT | EMAC_DESC_SECOND_ADDR_CHAIN;
    tx_desc->basic.desc1 = size & 0xfff;
}

static void emac_clean_tx_desc(struct dma_extended_desc *tx_desc)
{
    tx_desc->basic.desc0 = 0;
    tx_desc->basic.desc1 = 0;
}

static void emac_clean_rx_desc(struct dma_extended_desc *rx_desc)
{
    rx_desc->basic.desc0 = EMAC_DESC_RX_OWN;
    rx_desc->basic.desc1 = EMAC_DESC_RX_SECOND_ADDR_CHAIN | DMA_RX_BUF_SIZE;
}

static void emac_set_tx_base_reg(void)
{
    REG_WRITE(EMAC_DMATXBASEADDR_REG, (uint32_t)(emac_config.dma_etx));
}

static void emac_set_rx_base_reg(void)
{
    REG_WRITE(EMAC_DMARXBASEADDR_REG, (uint32_t)(emac_config.dma_erx));
}

static void emac_reset_dma_chain(void)
{
    emac_config.cnt_tx = 0;
    emac_config.cur_tx = 0;
    emac_config.dirty_tx = 0;

    emac_config.cnt_rx = 0;
    emac_config.cur_rx = 0;
    emac_config.dirty_rx = 0;
}

static void emac_init_dma_chain(void)
{
    int i;
    uint32_t dma_phy;
    struct dma_extended_desc *p = NULL;

    //init tx chain
    emac_config.dma_etx = (struct dma_extended_desc *)(&emac_dma_tx_chain_buf[0]);
    emac_config.cnt_tx = 0;
    emac_config.cur_tx = 0;
    emac_config.dirty_tx = 0;

    dma_phy = (uint32_t)(emac_config.dma_etx);
    p = emac_config.dma_etx;

    for (i = 0; i < (DMA_TX_BUF_NUM - 1); i++ ) {
        dma_phy += sizeof(struct dma_extended_desc);
        emac_clean_tx_desc(p);
        p->basic.desc3 = dma_phy;
        p->basic.desc2 = (uint32_t)(&emac_dma_tx_buf[0]) + (i * DMA_TX_BUF_SIZE);
        p++;
    }
    p->basic.desc3 = (uint32_t)(emac_config.dma_etx);
    p->basic.desc2 = (uint32_t)(&emac_dma_tx_buf[0]) + (i * DMA_TX_BUF_SIZE);

    //init desc0 desc1
    emac_clean_tx_desc(p);

    //init rx chain
    emac_config.dma_erx = (struct dma_extended_desc *)(&emac_dma_rx_chain_buf[0]);
    emac_config.cnt_rx = 0;
    emac_config.cur_rx = 0;
    emac_config.dirty_rx = 0;

    dma_phy = (uint32_t)(emac_config.dma_erx);
    p = emac_config.dma_erx;

    for (i = 0; i < (DMA_TX_BUF_NUM - 1); i++ ) {
        dma_phy += sizeof(struct dma_extended_desc);
        emac_clean_rx_desc(p);
        p->basic.desc3 = dma_phy;
        p->basic.desc2 = (uint32_t)(&emac_dma_rx_buf[0]) + (i * DMA_RX_BUF_SIZE);
        p++;
    }
    p->basic.desc3 = (uint32_t)(emac_config.dma_erx);
    p->basic.desc2 = (uint32_t)(&emac_dma_rx_buf[0]) + (i * DMA_RX_BUF_SIZE);

    //init desc0 desc1
    emac_clean_rx_desc(p);
}

void esp_eth_smi_write(uint32_t reg_num, uint16_t value)
{
    uint32_t phy_num = emac_config.phy_addr;

    while (REG_GET_BIT(EMAC_GMACGMIIADDR_REG, EMAC_GMIIBUSY) == 1 ) {
    }

    REG_WRITE(EMAC_GMACGMIIDATA_REG, value);
    REG_WRITE(EMAC_GMACGMIIADDR_REG, 0x3 | ((reg_num & 0x1f) << 6) | ((phy_num & 0x1f) << 11) | ((0x3) << 2));

    while (REG_GET_BIT(EMAC_GMACGMIIADDR_REG, EMAC_GMIIBUSY) == 1 ) {
    }
}

uint16_t esp_eth_smi_read(uint32_t reg_num)
{
    uint32_t phy_num = emac_config.phy_addr;
    uint16_t value = 0;

    while (REG_GET_BIT(EMAC_GMACGMIIADDR_REG, EMAC_GMIIBUSY) == 1 ) {
    }

    REG_WRITE(EMAC_GMACGMIIADDR_REG, 0x1 | ((reg_num & 0x1f) << 6) | ((phy_num & 0x1f) << 11) | (0x3 << 2));
    while (REG_GET_BIT(EMAC_GMACGMIIADDR_REG, EMAC_GMIIBUSY) == 1 ) {
    }
    value = (REG_READ(EMAC_GMACGMIIDATA_REG) & 0xffff);

    return value;
}

static void emac_set_user_config_data(eth_config_t *config )
{
    emac_config.phy_addr = config->phy_addr;
    emac_config.mac_mode = config->mac_mode;
    emac_config.phy_init = config->phy_init;
    emac_config.emac_tcpip_input = config->tcpip_input;
    emac_config.emac_gpio_config = config->gpio_config;
}

static esp_err_t emac_verify_args(void)
{
    esp_err_t ret = ESP_OK;

    if (emac_config.phy_addr > 31) {
        ESP_LOGE(TAG, "phy addr err");
        ret = ESP_FAIL;
    }

    if (emac_config.mac_mode != EMAC_MODE_RMII) {
        ESP_LOGE(TAG, "mac mode err,now only support RMII");
        ret = ESP_FAIL;
    }

    if (emac_config.phy_init == NULL) {
        ESP_LOGE(TAG, "phy_init func is null");
        ret = ESP_FAIL;
    }

    if (emac_config.emac_tcpip_input == NULL) {
        ESP_LOGE(TAG, "tcpip_input func is null");
        ret = ESP_FAIL;
    }

    if (emac_config.emac_gpio_config == NULL) {
        ESP_LOGE(TAG, "gpio config func is null");
        ret = ESP_FAIL;
    }

    return ret;
}

//TODO for mac filter
void emac_set_mac_addr(void)
{
}

//TODO
void emac_check_mac_addr(void)
{
}

static void emac_process_tx(void)
{
    uint32_t cur_tx_desc = emac_read_tx_cur_reg();

    while (((uint32_t) & (emac_config.dma_etx[emac_config.dirty_tx].basic.desc0) != cur_tx_desc)) {
        emac_clean_tx_desc(&(emac_config.dma_etx[emac_config.dirty_tx]));
        emac_config.dirty_tx = (emac_config.dirty_tx + 1) % DMA_TX_BUF_NUM;
        emac_config.cnt_tx --;

        if (emac_config.cnt_tx < 0) {
            ESP_LOGE(TAG, "emac tx chain err");
        }
    }
}

static void emac_process_rx(void)
{
    uint32_t cur_rx_desc = emac_read_rx_cur_reg();

    while (((uint32_t) & (emac_config.dma_erx[emac_config.dirty_rx].basic.desc0) != cur_rx_desc)) {
        //copy data to lwip
        emac_config.emac_tcpip_input((void *)(emac_config.dma_erx[emac_config.dirty_rx].basic.desc2),
                                     (((emac_config.dma_erx[emac_config.dirty_rx].basic.desc0) >> EMAC_DESC_FRAME_LENGTH_S) & EMAC_DESC_FRAME_LENGTH) , NULL);

        emac_clean_rx_desc(&(emac_config.dma_erx[emac_config.dirty_rx]));
        emac_config.dirty_rx = (emac_config.dirty_rx + 1) % DMA_RX_BUF_NUM;
        if (emac_config.rx_need_poll != 0) {
            emac_poll_rx_cmd();
            emac_config.rx_need_poll = 0;
        }
        //if open this ,one intr can do many intrs ?
        //cur_rx_desc = emac_read_rx_cur_reg();
    }
}

//TODO other events need to do something
static void IRAM_ATTR emac_process_intr(void *arg)
{
    uint32_t event;
    event = REG_READ(EMAC_DMASTATUS_REG);

    //clr intrs
    REG_WRITE(EMAC_DMASTATUS_REG, event);

    if (event & EMAC_RECV_BUF_UNAVAIL) {
        emac_config.rx_need_poll = 1;
    } else if (event & EMAC_TRANS_INT) {
        emac_post(SIG_EMAC_TX_DONE, 0);
    } else if (event & EMAC_RECV_INT) {
        emac_post(SIG_EMAC_RX_DONE, 0);
    } else {
        //other events
    }
}

static void emac_enable_intr()
{
    //init emac intr
    REG_SET_FIELD(DPORT_PRO_EMAC_INT_MAP_REG, DPORT_PRO_EMAC_INT_MAP, ETS_EMAC_INUM);
    xt_set_interrupt_handler(ETS_EMAC_INUM, emac_process_intr, NULL);
    xt_ints_on(1 << ETS_EMAC_INUM);

    REG_WRITE(EMAC_DMAINTERRUPT_EN_REG, EMAC_INTR_ENABLE_BIT);
}

static void emac_disable_intr()
{
    xt_ints_off(1 << ETS_EMAC_INUM);
    REG_WRITE(EMAC_DMAINTERRUPT_EN_REG, 0);
}

static bool emac_check_phy_link_status(void)
{
    return ((esp_eth_smi_read(1) & 0x4) == 0x4 );
}

static void emac_process_link_updown(bool link_status)
{
    system_event_t evt;

    emac_config.phy_link_up = link_status;

    if (link_status == true) {
        ESP_LOGI(TAG, "eth link_up!!!");
        emac_enable_dma_tx();
        emac_enable_dma_rx();
        ets_delay_us(200000);
        evt.event_id = SYSTEM_EVENT_ETH_CONNECTED;
    } else {
        ESP_LOGI(TAG, "eth link_down!!!");
        emac_disable_dma_tx();
        emac_disable_dma_rx();
        evt.event_id = SYSTEM_EVENT_ETH_DISCONNECTED;
    }

    esp_event_send(&evt);
}

static void emac_hw_init(void)
{
    //init chain
    emac_init_dma_chain();

    //get hw features TODO

    //ipc TODO
}

static esp_err_t emac_xmit(void *param)
{
    struct emac_post_cmd  *post_cmd = (struct emac_post_cmd *)param;
    struct emac_tx_cmd *cmd = (struct emac_tx_cmd *)(post_cmd->cmd);
    esp_err_t ret = ESP_OK;

    void *buf = cmd->buf;
    uint16_t size = cmd->size;

    if (emac_config.emac_status != EMAC_RUNTIME_START || emac_config.emac_status == EMAC_RUNTIME_NOT_INIT) {
        ESP_LOGI(TAG, "tx netif close");
        cmd->err = ERR_IF;
        ret = ESP_FAIL;
        goto _exit;
    }

    if (emac_config.cnt_tx == DMA_TX_BUF_NUM) {
        ESP_LOGI(TAG, "tx buf full");
        cmd->err = ERR_MEM;
        ret = ESP_FAIL;
        goto _exit;
    }

    memcpy((uint8_t *)(emac_config.dma_etx[emac_config.cur_tx].basic.desc2), (uint8_t *)buf, size);

    emac_setup_tx_desc(&(emac_config.dma_etx[emac_config.cur_tx]), size);

    emac_config.cnt_tx ++;
    emac_config.cur_tx = (emac_config.cur_tx + 1) % DMA_TX_BUF_NUM ;

    emac_poll_tx_cmd();

_exit:

    if (post_cmd->post_type == EMAC_POST_SYNC) {
        xSemaphoreGive(emac_g_sem);
    }

    return ret;
}

static void emac_init_default_data(void)
{
    emac_config.rx_need_poll = 0;
}

void emac_link_check_func(void *pv_parameters)
{
    if (emac_config.emac_status != EMAC_RUNTIME_START ||
        emac_config.emac_status == EMAC_RUNTIME_NOT_INIT) {
        return;
    }

    if (emac_check_phy_link_status() == true ) {
        if (emac_config.phy_link_up == false) {
            emac_process_link_updown(true);
        }
    } else {
        if (emac_config.phy_link_up == true) {
            emac_process_link_updown(false);
        }
    }
}

static bool emac_link_check_timer_init(void)
{
    emac_timer = xTimerCreate("emac_timer", (1000 / portTICK_RATE_MS),
                              pdTRUE, (void *)rand(), emac_link_check_func);
    if (emac_timer == NULL) {
        return false;
    } else {
        return true;
    }
}

static bool emac_link_check_timer_start(void)
{
    if (xTimerStart(emac_timer, portMAX_DELAY) != pdPASS) {
        return false;
    } else {
        return true;
    }
}

static bool emac_link_check_timer_stop(void)
{
    if (xTimerStop(emac_timer, portMAX_DELAY) != pdPASS) {
        return false;
    } else {
        return true;
    }
}

static bool emac_link_check_timer_delete(void)
{
    xTimerDelete(emac_timer, portMAX_DELAY);
    emac_timer = NULL;
    return true;
}

static void emac_start(void *param)
{
    struct emac_post_cmd  *post_cmd = (struct emac_post_cmd *)param;
    struct emac_open_cmd *cmd = (struct emac_open_cmd *)(post_cmd->cmd);

    ESP_LOGI(TAG , "emac start !!!\n");
    cmd->err = EMAC_CMD_OK;
    emac_enable_clk(true);

    emac_macaddr_init();

    emac_check_mac_addr();

    emac_set_mac_addr();

    emac_set_tx_base_reg();
    emac_set_rx_base_reg();
    emac_mac_init();

    emac_config.phy_init();

    //for test
    //emac_wait_linkup();

    //mmc  not support

    //ptp TODO

    //enable emac intr
    emac_enable_intr();

    emac_config.emac_status = EMAC_RUNTIME_START;

    system_event_t evt;
    evt.event_id = SYSTEM_EVENT_ETH_START;
    esp_event_send(&evt);

    //set a timer to check link up status
    if (emac_link_check_timer_init() == true) {
        if (emac_link_check_timer_start() != true) {
            cmd->err = EMAC_CMD_FAIL;
            emac_link_check_timer_delete();
        }
    } else {
        cmd->err = EMAC_CMD_FAIL;
    }

    if (post_cmd->post_type == EMAC_POST_SYNC) {
        xSemaphoreGive(emac_g_sem);
    }

    ESP_LOGI(TAG, "emac start success !!!");
}

esp_err_t esp_eth_enable(void)
{
    struct emac_post_cmd post_cmd;
    struct emac_open_cmd open_cmd;

    post_cmd.cmd = (void *)(&open_cmd);
    open_cmd.err = EMAC_CMD_OK;

    if (emac_config.emac_status == EMAC_RUNTIME_START) {
        open_cmd.err = EMAC_CMD_OK;
        return open_cmd.err;
    }

    if (emac_config.emac_status != EMAC_RUNTIME_NOT_INIT) {
        if (emac_ioctl(SIG_EMAC_START, (emac_par_t)(&post_cmd)) != 0) {
            open_cmd.err = EMAC_CMD_FAIL;
        }
    } else {
        open_cmd.err = EMAC_CMD_FAIL;
    }
    return open_cmd.err;
}

static void emac_stop(void *param)
{
    struct emac_post_cmd  *post_cmd = (struct emac_post_cmd *)param;
    ESP_LOGI(TAG, "emac stop");

    emac_link_check_timer_stop();
    emac_link_check_timer_delete();

    emac_process_link_updown(false);

    emac_disable_intr();
    emac_reset_dma_chain();
    emac_reset();
    emac_enable_clk(false);

    emac_config.emac_status = EMAC_RUNTIME_STOP;
    system_event_t evt;
    evt.event_id = SYSTEM_EVENT_ETH_STOP;
    esp_event_send(&evt);

    if (post_cmd->post_type == EMAC_POST_SYNC) {
        xSemaphoreGive(emac_g_sem);
    }

    ESP_LOGI(TAG, "emac stop success !!!");
}

esp_err_t esp_eth_disable(void)
{
    struct emac_post_cmd post_cmd;
    struct emac_close_cmd close_cmd;

    post_cmd.cmd = (void *)(&close_cmd);
    close_cmd.err = EMAC_CMD_OK;

    if (emac_config.emac_status == EMAC_RUNTIME_STOP) {
        close_cmd.err = EMAC_CMD_OK;
        return close_cmd.err;
    }

    if (emac_config.emac_status != EMAC_RUNTIME_NOT_INIT) {
        if (emac_ioctl(SIG_EMAC_STOP, (emac_par_t)(&post_cmd)) != 0) {
            close_cmd.err = EMAC_CMD_FAIL;
        }
    } else {
        close_cmd.err = EMAC_CMD_FAIL;
    }
    return close_cmd.err;
}

static esp_err_t emac_ioctl(emac_sig_t sig, emac_par_t par)
{
    esp_err_t ret = ESP_OK;
    struct emac_post_cmd  *post_cmd = (struct emac_post_cmd *)par;
    xTaskHandle task_hdl = xTaskGetCurrentTaskHandle();

    if (emac_task_hdl != task_hdl) {
        post_cmd->post_type = EMAC_POST_SYNC;
        if (emac_post(sig, par) != ESP_OK) {
            ret = ESP_FAIL;
            return ret;
        };

        if (xSemaphoreTake(emac_g_sem, portMAX_DELAY) == pdTRUE) {
            return ret;
        }
    } else {
        post_cmd->post_type = EMAC_POST_ASYNC;
        switch (sig) {
        case SIG_EMAC_RX_DONE:
            emac_process_rx();
            break;
        case SIG_EMAC_TX_DONE:
            emac_process_tx();
            break;
        case SIG_EMAC_TX:
            emac_xmit((void *)par);
            break;
        case SIG_EMAC_START:
            emac_start((void *)par);
            break;
        case SIG_EMAC_STOP:
            emac_stop((void *)par);
            break;
        default:
            ESP_LOGE(TAG, "unexpect sig %d", sig);
            break;
        }
    }

    return ret;
}

esp_err_t esp_eth_tx(uint8_t *buf, uint16_t size)
{
    struct emac_post_cmd post_cmd;
    struct emac_tx_cmd tx_cmd;

    post_cmd.cmd = (void *)(&tx_cmd);

    if (emac_check_phy_link_status() == false) {
        emac_process_link_updown(false);
        tx_cmd.err = ERR_IF;
    } else {
        tx_cmd.buf = buf;
        tx_cmd.size = size;
        tx_cmd.err = ERR_OK;

        if (emac_ioctl(SIG_EMAC_TX, (emac_par_t)(&post_cmd)) != 0) {
            tx_cmd.err = ERR_MEM;
        }
    }

    return tx_cmd.err;
}

void emac_task(void *pv)
{
    emac_event_t e;

    for (;;) {
        if (xQueueReceive(emac_xqueue, &e, (portTickType)portMAX_DELAY) == pdTRUE) {
            portENTER_CRITICAL(&g_emac_mux);
            emac_sig_cnt[e.sig]--;
            portEXIT_CRITICAL(&g_emac_mux);
            switch (e.sig) {
            case SIG_EMAC_RX_DONE:
                emac_process_rx();
                break;
            case SIG_EMAC_TX_DONE:
                emac_process_tx();
                break;
            case SIG_EMAC_TX:
                emac_xmit((void *)e.par);
                break;
            case SIG_EMAC_START:
                emac_start((void *)e.par);
                break;
            case SIG_EMAC_STOP:
                emac_stop((void *)e.par);
                break;
            default:
                ESP_LOGE(TAG, "unexpect sig %d", e.sig);
                break;
            }
        }
    }
}

esp_err_t IRAM_ATTR emac_post(emac_sig_t sig, emac_par_t par)
{
    portENTER_CRITICAL(&g_emac_mux);

    if (emac_sig_cnt[sig] && sig != SIG_EMAC_TX) {
        portEXIT_CRITICAL(&g_emac_mux);
        return ESP_OK;
    } else {
        emac_sig_cnt[sig]++;
        portEXIT_CRITICAL(&g_emac_mux);
        emac_event_t evt;
        evt.sig = sig;
        evt.par = par;
        if (sig <= SIG_EMAC_RX_DONE) {
            portBASE_TYPE tmp;

            if (xQueueSendFromISR(emac_xqueue, &evt, &tmp) != pdPASS) {
                return ESP_FAIL;
            }
        } else {
            if (xQueueSend(emac_xqueue, &evt, 10 / portTICK_RATE_MS) != pdTRUE) {
                return ESP_FAIL;
            }
        }
    }

    return ESP_OK;
}

esp_err_t esp_eth_init(eth_config_t *config)
{
    esp_err_t ret = ESP_OK;
#if !CONFIG_ETHERNET
    ESP_LOGI(TAG, "eth driver init fail,please make menuconfig and enable ethernet .");
    ret = ESP_FAIL;
    goto _exit;
#endif

    emac_init_default_data();

    if (config != NULL ) {
        emac_set_user_config_data(config);
    }

    ret = emac_verify_args();

    if (ret != ESP_OK) {
        goto _exit;
    }

    //before set emac reg must enable clk
    emac_enable_clk(true);
    REG_SET_FIELD(EMAC_EX_PHYINF_CONF_REG, EMAC_EX_PHY_INTF_SEL, EMAC_EX_PHY_INTF_RMII);

    emac_dma_init();
    if (emac_config.mac_mode == EMAC_MODE_RMII) {
        emac_set_clk_rmii();
    } else {
        emac_set_clk_mii();
    }

    emac_config.emac_gpio_config();

    ESP_LOGI(TAG, "mac version %04xa", emac_read_mac_version());
    emac_hw_init();

    //watchdog  TODO

    //init task for emac
    emac_g_sem = xSemaphoreCreateBinary();
    emac_xqueue = xQueueCreate(EMAC_EVT_QNUM, sizeof(emac_event_t));
    xTaskCreate(emac_task, "emacT", 2048 * 4, NULL, (19), &emac_task_hdl);

    emac_reset();
    emac_enable_clk(false);

    emac_config.emac_status = EMAC_RUNTIME_INIT;

_exit:
    return ret;
}