Function designware_eth_send

bsp/cvitek/drivers/libraries/eth/dw_eth_mac.c:339–414

}

static int32_t designware_eth_send(eth_mac_handle_t handle, const uint8_t *frame, uint32_t length)
{
    gmac_dev_t *mac_dev = (gmac_dev_t *)handle;
    struct dw_gmac_priv *priv = mac_dev->priv;
    struct dw_gmac_dma_regs *dma_reg = mac_dev->priv->dma_regs_p;
    uint32_t desc_num = priv->tx_currdescnum;
    struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];
    uint64_t desc_start = (uint64_t)desc_p;
    uint64_t desc_end = desc_start + roundup(sizeof(*desc_p), DW_GMAC_DMA_ALIGN);
    uint64_t data_start = (uint64_t)DRV_IOREMAP((void *)desc_p->dmamac_addr, 0x1000);
    uint64_t data_end = data_start + roundup(length, DW_GMAC_DMA_ALIGN);
    uint32_t count = 0;

    /*
     * Strictly we only need to invalidate the "txrx_status" field
     * for the following check, but on some platforms we cannot
     * invalidate only 4 bytes, so we flush the entire descriptor,
     * which is 16 bytes in total. This is safe because the
     * individual descriptors in the array are each aligned to
     * DW_GMAC_DMA_ALIGN and padded appropriately.
     */

    /* Check if the descriptor is owned by CPU */
    while (1)
    {
        rt_hw_cpu_dcache_invalidate((void *)desc_start, desc_end - desc_start);
        if (!(desc_p->txrx_status & CVI_DESC_TXSTS_OWNBYDMA))
        {
            break;
        }

        if (count > 1000)
        {
            rt_kprintf("desc onwer is DMA\n");
            return -1;
        }
        count ++;
        rt_thread_mdelay(1);
    }

    memcpy((void *)data_start, frame, length);

    /* Flush data to be sent */
    rt_hw_cpu_dcache_clean((void *)data_start, data_end - data_start);

#if defined(CONFIG_DW_ALTDESCRIPTOR)
    desc_p->txrx_status |= CVI_DESC_TXSTS_TXFIRST | CVI_DESC_TXSTS_TXLAST;
    desc_p->dmamac_cntl &= ~CVI_DESC_TXCTRL_SIZE1MASK;
    desc_p->dmamac_cntl |= (length << CVI_DESC_TXCTRL_SIZE1SHFT) &
                   CVI_DESC_TXCTRL_SIZE1MASK;

    desc_p->txrx_status &= ~(CVI_DESC_TXSTS_MSK);
    desc_p->txrx_status |= CVI_DESC_TXSTS_OWNBYDMA;
#else
    desc_p->dmamac_cntl &= ~CVI_DESC_TXCTRL_SIZE1MASK;
    desc_p->dmamac_cntl |= ((length << CVI_DESC_TXCTRL_SIZE1SHFT) &
                   CVI_DESC_TXCTRL_SIZE1MASK) | CVI_DESC_TXCTRL_TXLAST |
                   CVI_DESC_TXCTRL_TXFIRST;