linux-kernel - [PATCH 06/13] dmaengine: edma: Get qDMA channel information from HW also

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Message-ID: <1444828344-21378-7-git-send-email-peter.ujfalusi@ti.com>
Date:	Wed, 14 Oct 2015 16:12:17 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <nsekhar@...com>, <linux@....linux.org.uk>
CC:	<olof@...om.net>, <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<tony@...mide.com>, <r.schwebel@...gutronix.de>
Subject: [PATCH 06/13] dmaengine: edma: Get qDMA channel information from HW also

Query the number of qDMA channels from CCCFG register.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index a02f84c7c3d7..d064fbc47351 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -107,6 +107,7 @@
 
 /* CCCFG register */
 #define GET_NUM_DMACH(x)	(x & 0x7) /* bits 0-2 */
+#define GET_NUM_QDMACH(x)	(x & 0x70 >> 4) /* bits 4-6 */
 #define GET_NUM_PAENTRY(x)	((x & 0x7000) >> 12) /* bits 12-14 */
 #define GET_NUM_EVQUE(x)	((x & 0x70000) >> 16) /* bits 16-18 */
 #define GET_NUM_REGN(x)		((x & 0x300000) >> 20) /* bits 20-21 */
@@ -220,6 +221,7 @@ struct edma_cc {
 
 	/* eDMA3 resource information */
 	unsigned			num_channels;
+	unsigned			num_qchannels;
 	unsigned			num_region;
 	unsigned			num_slots;
 	unsigned			num_tc;
@@ -1813,6 +1815,9 @@ static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
 	value = GET_NUM_DMACH(cccfg);
 	ecc->num_channels = BIT(value + 1);
 
+	value = GET_NUM_QDMACH(cccfg);
+	ecc->num_qchannels = value * 2;
+
 	value = GET_NUM_PAENTRY(cccfg);
 	ecc->num_slots = BIT(value + 4);
 
@@ -1824,6 +1829,7 @@ static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
 	dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
 	dev_dbg(dev, "num_region: %u\n", ecc->num_region);
 	dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
+	dev_dbg(dev, "num_qchannels: %u\n", ecc->num_qchannels);
 	dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
 	dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
 	dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
-- 
2.6.1

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