Function sdio_host_create

bsp/at32/libraries/rt_drivers/drv_sdio.c:616–679

* @brief this function create mmcsd host. * @param sdio_des at32_sdio_des * @retval rt_mmcsd_host */

  * @retval rt_mmcsd_host
  */
struct rt_mmcsd_host *sdio_host_create(struct at32_sdio_des *sdio_des)
{
    struct rt_mmcsd_host *host;
    struct rt_hw_sdio *sdio = RT_NULL;

    if ((sdio_des == RT_NULL) || (sdio_des->txconfig == RT_NULL) || (sdio_des->rxconfig == RT_NULL))
    {
        LOG_E("L:%d F:%s %s %s %s",
              (sdio_des == RT_NULL ? "sdio_des is NULL" : ""),
              (sdio_des ? (sdio_des->txconfig ? "txconfig is NULL" : "") : ""),
              (sdio_des ? (sdio_des->rxconfig ? "rxconfig is NULL" : "") : "")
             );
        return RT_NULL;
    }

    sdio = rt_malloc(sizeof(struct rt_hw_sdio));
    if (sdio == RT_NULL)
    {
        LOG_E("L:%d F:%s malloc rt_hw_sdio fail");
        return RT_NULL;
    }
    rt_memset(sdio, 0, sizeof(struct rt_hw_sdio));

    host = mmcsd_alloc_host();
    if (host == RT_NULL)
    {
        LOG_E("L:%d F:%s mmcsd alloc host fail");
        rt_free(sdio);
        return RT_NULL;
    }

    rt_memcpy(&sdio->sdio_des, sdio_des, sizeof(struct at32_sdio_des));
    sdio->sdio_des.hw_sdio = (sdio_des->hw_sdio == RT_NULL ? (struct at32_sdio *)SDIO_BASE_ADDRESS : sdio_des->hw_sdio);
    sdio->sdio_des.clk_get = (sdio_des->clk_get == RT_NULL ? at32_sdio_clk_get : sdio_des->clk_get);

    rt_event_init(&sdio->event, "sdio", RT_IPC_FLAG_FIFO);
    rt_mutex_init(&sdio->mutex, "sdio", RT_IPC_FLAG_PRIO);

    /* set host defautl attributes */
    host->ops = &ops;
    host->freq_min = 400 * 1000;
    host->freq_max = SDIO_MAX_FREQ;
    host->valid_ocr = 0X00FFFF80;/* the voltage range supported is 1.65v-3.6v */
#ifndef SDIO_USING_1_BIT
    host->flags = MMCSD_BUSWIDTH_4 | MMCSD_MUTBLKWRITE | MMCSD_SUP_SDIO_IRQ;
#else
    host->flags = MMCSD_MUTBLKWRITE | MMCSD_SUP_SDIO_IRQ;
#endif
    host->max_seg_size = SDIO_BUFF_SIZE;
    host->max_dma_segs = 1;
    host->max_blk_size = 512;
    host->max_blk_count = 512;

    /* link up host and sdio */
    sdio->host = host;
    host->private_data = sdio;

    rt_hw_sdio_irq_update(host, 1);