linux-kernel - [PATCH V02 4/5] dmaengine: edma: Add support for DMA filter mapping to slave devices

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Message-ID: <1450092140-31602-5-git-send-email-peter.ujfalusi@ti.com>
Date:	Mon, 14 Dec 2015 13:22:19 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <arnd@...db.de>,
	<andy.shevchenko@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>,
	<tony@...mide.com>
Subject: [PATCH V02 4/5] dmaengine: edma: Add support for DMA filter mapping to slave devices

Add support for providing device to filter_fn mapping so client drivers
can switch to use the dma_request_chan() API.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c                 | 4 ++++
 include/linux/platform_data/edma.h | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 16fe773fb846..2e8acde6b134 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -2314,6 +2314,10 @@ static int edma_probe(struct platform_device *pdev)
 		edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
 	}
 
+	ecc->dma_slave.filter.map = info->slave_map;
+	ecc->dma_slave.filter.mapcnt = info->slavecnt;
+	ecc->dma_slave.filter.fn = edma_filter_fn;
+
 	ret = dma_async_device_register(&ecc->dma_slave);
 	if (ret) {
 		dev_err(dev, "slave ddev registration failed (%d)\n", ret);
diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index 4299f4ba03bd..0a533f94438f 100644
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h
@@ -53,12 +53,16 @@ enum dma_event_q {
 #define EDMA_CTLR(i)			((i) >> 16)
 #define EDMA_CHAN_SLOT(i)		((i) & 0xffff)
 
+#define EDMA_FILTER_PARAM(ctlr, chan)	((int[]) { EDMA_CTLR_CHAN(ctlr, chan) })
+
 struct edma_rsv_info {
 
 	const s16	(*rsv_chans)[2];
 	const s16	(*rsv_slots)[2];
 };
 
+struct dma_slave_map;
+
 /* platform_data for EDMA driver */
 struct edma_soc_info {
 	/*
@@ -76,6 +80,9 @@ struct edma_soc_info {
 
 	s8	(*queue_priority_mapping)[2];
 	const s16	(*xbar_chans)[2];
+
+	const struct dma_slave_map *slave_map;
+	int slavecnt;
 };
 
 #endif
-- 
2.6.4

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