linux-kernel - [PATCH] dw_dmac: utilize slave

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Date:	Mon,  3 Sep 2012 13:46:19 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Viresh Kumar <viresh.linux@...il.com>,
	linux-kernel@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH] dw_dmac: utilize slave_id to pass request line

There is slave_id field in the generic slave config structure that is dedicated
for the uniq slave number. In our case we have the request lines wired to the
certain hardware. Therefore the number of the request line is uniq and could be
used as slave_id. It allows us in some cases to drop out the usage of the
custom slave config structure.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/dw_dmac.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index f0c9403..7a67673 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -187,6 +187,11 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
 
 		cfghi = dws->cfg_hi;
 		cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
+	} else {
+		if (dwc->dma_sconfig.direction == DMA_MEM_TO_DEV)
+			cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id);
+		else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM)
+			cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id);
 	}
 
 	channel_writel(dwc, CFG_LO, cfglo);
-- 
1.7.10.4

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