int tsi721_register_dma()

in devices/tsi721_dma.c [962:1016]

• 43 lines of code
• 5 McCabe index (conditional complexity)

int tsi721_register_dma(struct tsi721_device *priv)
{
	int i;
	int nr_channels = 0;
	int err;
	struct rio_mport *mport = &priv->mport;

	INIT_LIST_HEAD(&mport->dma.channels);

	for (i = 0; i < TSI721_DMA_MAXCH; i++) {
		struct tsi721_bdma_chan *bdma_chan = &priv->bdma[i];

		if ((i == TSI721_DMACH_MAINT) || (dma_sel & (1 << i)) == 0)
			continue;

		bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);

		bdma_chan->dchan.device = &mport->dma;
		bdma_chan->dchan.cookie = 1;
		bdma_chan->dchan.chan_id = i;
		bdma_chan->id = i;
		bdma_chan->active = false;

		spin_lock_init(&bdma_chan->lock);

		bdma_chan->active_tx = NULL;
		INIT_LIST_HEAD(&bdma_chan->queue);
		INIT_LIST_HEAD(&bdma_chan->free_list);

		tasklet_init(&bdma_chan->tasklet, tsi721_dma_tasklet,
			     (unsigned long)bdma_chan);
		list_add_tail(&bdma_chan->dchan.device_node,
			      &mport->dma.channels);
		nr_channels++;
	}

	mport->dma.chancnt = nr_channels;
	dma_cap_zero(mport->dma.cap_mask);
	dma_cap_set(DMA_PRIVATE, mport->dma.cap_mask);
	dma_cap_set(DMA_SLAVE, mport->dma.cap_mask);

	mport->dma.dev = &priv->pdev->dev;
	mport->dma.device_alloc_chan_resources = tsi721_alloc_chan_resources;
	mport->dma.device_free_chan_resources = tsi721_free_chan_resources;
	mport->dma.device_tx_status = tsi721_tx_status;
	mport->dma.device_issue_pending = tsi721_issue_pending;
	mport->dma.device_prep_slave_sg = tsi721_prep_rio_sg;
	mport->dma.device_terminate_all = tsi721_terminate_all;

	err = dma_async_device_register(&mport->dma);
	if (err)
		tsi_err(&priv->pdev->dev, "Failed to register DMA device");

	return err;
}