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Commit acd6d772 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Chris Ball
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mmc: sh_mmcif: add support for Device Tree DMA bindings 



To use DMA in the Device Tree case the driver has to be modified
to use suitable API to obtain DMA channels.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent d00cadac

drivers/mmc/host/sh_mmcif.c

+16 −10
Original line number Diff line number Diff line
@@ -387,24 +387,28 @@ static void sh_mmcif_request_dma(struct sh_mmcif_host *host, 


	host->dma_active = false;



	if (!pdata)

		return;



	if (pdata) {

		if (pdata->slave_id_tx <= 0 || pdata->slave_id_rx <= 0)

			return;

	} else if (!host->pd->dev.of_node) {

		return;

	}



	/* We can only either use DMA for both Tx and Rx or not use it at all */

	dma_cap_zero(mask);

	dma_cap_set(DMA_SLAVE, mask);



	host->chan_tx = dma_request_channel(mask, shdma_chan_filter,

					    (void *)pdata->slave_id_tx);

	host->chan_tx = dma_request_slave_channel_compat(mask, shdma_chan_filter,

				pdata ? (void *)pdata->slave_id_tx : NULL,

				&host->pd->dev, "tx");

	dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,

		host->chan_tx);



	if (!host->chan_tx)

		return;



	/* In the OF case the driver will get the slave ID from the DT */

	if (pdata)

		cfg.slave_id = pdata->slave_id_tx;

	cfg.direction = DMA_MEM_TO_DEV;

	cfg.dst_addr = res->start + MMCIF_CE_DATA;
@@ -413,14 +417,16 @@ static void sh_mmcif_request_dma(struct sh_mmcif_host *host, 
	if (ret < 0)

		goto ecfgtx;



	host->chan_rx = dma_request_channel(mask, shdma_chan_filter,

					    (void *)pdata->slave_id_rx);

	host->chan_rx = dma_request_slave_channel_compat(mask, shdma_chan_filter,

				pdata ? (void *)pdata->slave_id_rx : NULL,

				&host->pd->dev, "rx");

	dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,

		host->chan_rx);



	if (!host->chan_rx)

		goto erqrx;



	if (pdata)

		cfg.slave_id = pdata->slave_id_rx;

	cfg.direction = DMA_DEV_TO_MEM;

	cfg.dst_addr = 0;