static uint32_t sdhci_read_dataport(SDHCIState *s, unsigned size)
{
    uint32_t value = 0;
    int i;

    /* first check that a valid data exists in host controller input buffer */
    if ((s->prnsts & SDHC_DATA_AVAILABLE) == 0) {
        trace_sdhci_error("read from empty buffer");
        return 0;
    }

    for (i = 0; i < size; i++) {
        value |= s->fifo_buffer[s->data_count] << i * 8;
        s->data_count++;
        /* check if we've read all valid data (blksize bytes) from buffer */
        if ((s->data_count) >= (s->blksize & BLOCK_SIZE_MASK)) {
            trace_sdhci_read_dataport(s->data_count);
            s->prnsts &= ~SDHC_DATA_AVAILABLE; /* no more data in a buffer */
            s->data_count = 0;  /* next buff read must start at position [0] */

            if (s->trnmod & SDHC_TRNS_BLK_CNT_EN) {
                s->blkcnt--;
            }

            /* if that was the last block of data */
            if ((s->trnmod & SDHC_TRNS_MULTI) == 0 ||
                ((s->trnmod & SDHC_TRNS_BLK_CNT_EN) && (s->blkcnt == 0)) ||
                 /* stop at gap request */
                (s->stopped_state == sdhc_gap_read &&
                 !(s->prnsts & SDHC_DAT_LINE_ACTIVE))) {
                sdhci_end_transfer(s);
            } else { /* if there are more data, read next block from card */
                sdhci_read_block_from_card(s);
            }
            break;
        }
    }

    return value;
}
Unknown