linux-kernel - [PATCH v3 07/21] ARM: dts: parse DMA config in pxamci

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Message-Id: <1387309071-22382-8-git-send-email-ynvich@gmail.com>
Date:	Tue, 17 Dec 2013 23:37:37 +0400
From:	Sergei Ianovich <ynvich@...il.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Sergei Ianovich <ynvich@...il.com>, Daniel Mack <zonque@...il.com>,
	Arnd Bergmann <arnd@...db.de>, Chris Ball <cjb@...top.org>,
	Mark Brown <broonie@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-mmc@...r.kernel.org
Subject: [PATCH v3 07/21] ARM: dts: parse DMA config in pxamci

The existing PXA MMC driver cannot get DMA channels in a proper
way from the respective device tree binding.

This patch provides temporary workaround which allows using the
existing driver in DT machines by pointing to the proper
dmaengine-based "marvell,pdma-1.0" DMA.

Even though the new DMA provider is not present we can parse device node
attributes manually and use channel numbers to acquire DMA channel
from the existing non-dmaengine provider.

When Daniel's DMA series is merged there will be no need to manually
parse for "dmas" and this patch can be safely reverted.

Signed-off-by: Sergei Ianovich <ynvich@...il.com>
CC: Daniel Mack <zonque@...il.com>
CC: Arnd Bergmann <arnd@...db.de>
---
   v2..v3
   * split into good (PATCH 07/21) and temporary (this one) parts

   v1..v2
   * add binding for next-gen dma controller
   * use correct dma declararion
   * number changed from 5 to 3

 drivers/mmc/host/pxamci.c | 59 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 32fe113..6b67764 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -613,11 +613,46 @@ static int pxamci_of_init(struct platform_device *pdev)
 
         return 0;
 }
+
+static int pxamci_of_init_dma(struct platform_device *pdev,
+		struct pxamci_host *host)
+{
+	struct device_node *np = pdev->dev.of_node;
+	u32 tmp;
+	int i;
+	int ret;
+
+	i = of_property_match_string(np, "dma-names", "rx");
+	if (i < 0)
+		return i;
+
+	ret = of_property_read_u32_index(np, "dmas", 2 * i + 1, &tmp);
+	if (ret < 0)
+		return ret;
+	host->dma_drcmrrx = tmp;
+
+	i = of_property_match_string(np, "dma-names", "tx");
+	if (i < 0)
+		return i;
+
+	ret = of_property_read_u32_index(np, "dmas", 2 * i + 1, &tmp);
+	if (ret < 0)
+		return ret;
+	host->dma_drcmrtx = tmp;
+
+	return 0;
+}
 #else
 static int pxamci_of_init(struct platform_device *pdev)
 {
         return 0;
 }
+
+static int pxamci_of_init_dma(struct platform_device *pdev,
+		struct pxamci_host *host)
+{
+	return -ENODATA;
+}
 #endif
 
 static int pxamci_probe(struct platform_device *pdev)
@@ -741,19 +776,21 @@ static int pxamci_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mmc);
 
-	dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!dmarx) {
-		ret = -ENXIO;
-		goto out;
-	}
-	host->dma_drcmrrx = dmarx->start;
+	if (pxamci_of_init_dma(pdev, host) < 0) {
+		dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+		if (!dmarx) {
+			ret = -ENXIO;
+			goto out;
+		}
+		host->dma_drcmrrx = dmarx->start;
 
-	dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!dmatx) {
-		ret = -ENXIO;
-		goto out;
+		dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+		if (!dmatx) {
+			ret = -ENXIO;
+			goto out;
+		}
+		host->dma_drcmrtx = dmatx->start;
 	}
-	host->dma_drcmrtx = dmatx->start;
 
 	if (host->pdata) {
 		gpio_cd = host->pdata->gpio_card_detect;
-- 
1.8.4.2

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