[PATCH 5/9] ARM: dts: provide DMA config to pxamci

Sergei Ianovich
2013-12-08T22:53:45Z

Non-dts implementation supply required DMA channel numbers as
IORESOURCE_DMA. However, there is was no way to get them from
device tree.

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
CC: Daniel Mack <zonque@gmail.com>
CC: Arnd Bergmann <arnd@arndb.de>
---
Documentation/devicetree/bindings/mmc/pxa-mmc.txt | 2 +
arch/arm/boot/dts/pxa27x.dtsi | 4 ++
drivers/mmc/host/pxamci.c | 50 ++++++++++++++++++-----
3 files changed, 45 insertions(+), 11 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/pxa-mmc.txt b/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
index b7025de..27447ec 100644
--- a/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
@@ -5,6 +5,7 @@ Driver bindings for the PXA MCI (MMC/SDIO) interfaces
Required properties:
- compatible: Should be "marvell,pxa-mmc".
- vmmc-supply: A regulator for VMMC
+- marvell,dma-channels: 2 PXA DMA channels [0] for RX, [1] for TX

Optional properties:
- marvell,detect-delay-ms: sets the detection delay timeout in ms.
@@ -19,6 +20,7 @@ mmc0: mmc at 41100000 {
compatible = "marvell,pxa-mmc";
reg = <0x41100000 0x1000>;
interrupts = <23>;
+ marvell,dma-channels = <21 22>;
cd-gpios = <&gpio 23 0>;
wp-gpios = <&gpio 24 0>;
};
diff --git a/arch/arm/boot/dts/pxa27x.dtsi b/arch/arm/boot/dts/pxa27x.dtsi
index 44df554..3f97520 100644
--- a/arch/arm/boot/dts/pxa27x.dtsi
+++ b/arch/arm/boot/dts/pxa27x.dtsi
@@ -16,5 +16,9 @@
interrupts = <8>, <9>, <10>;
interrupt-names = "gpio0", "gpio1", "gpio_mux";
};
+
+ mmc at 41100000 {
+ marvell,dma-channels = <21 22>;
+ };
};
};
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 32fe113..8c7a110 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -613,11 +613,37 @@ 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 ret;
+
+ ret = of_property_read_u32_index(np, "marvell,dma-channels", 0, &tmp);
+ if (ret < 0)
+ return ret;
+ host->dma_drcmrrx = tmp;
+
+ ret = of_property_read_u32_index(np, "marvell,dma-channels", 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 +767,21 @@ 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;
--
1.8.4.3