linux-kernel - [PATCH/RFC 4/6] ARM: shmobile: sh73a0: add support for the DMA0 controller in DT

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Date:	Thu, 11 Apr 2013 00:19:47 +0200
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	linux-sh@...r.kernel.org
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Subject: [PATCH/RFC 4/6] ARM: shmobile: sh73a0: add support for the DMA0 controller in DT

Add a Device Tree node for the DMA0 controller on sh73a0 and
auxdata to supply platform data to the driver. To enable the
DMA0 controller it also has to be taken out of reset.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
---
 arch/arm/boot/dts/sh73a0.dtsi         |   36 +++++++++++++++++++++++++++++++++
 arch/arm/mach-shmobile/setup-sh73a0.c |    4 +++
 2 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/sh73a0.dtsi b/arch/arm/boot/dts/sh73a0.dtsi
index ec40bf7..edcf4f7 100644
--- a/arch/arm/boot/dts/sh73a0.dtsi
+++ b/arch/arm/boot/dts/sh73a0.dtsi
@@ -119,6 +119,42 @@
 			      0 32 0x4>;
 	};
 
+	dma0: shdma@...00020 {
+		compatible = "renesas,shdma";
+		reg = <0xfe000020 0x89e0>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 129 4
+				0 109 4
+				0 110 4
+				0 111 4
+				0 112 4
+				0 113 4
+				0 114 4
+				0 115 4
+				0 116 4
+				0 117 4
+				0 118 4
+				0 119 4
+				0 120 4
+				0 121 4
+				0 122 4
+				0 123 4
+				0 124 4
+				0 125 4
+				0 126 4
+				0 127 4
+				0 128 4>;
+		interrupt-names = "error",
+				"ch0", "ch1", "ch2", "ch3",
+				"ch4", "ch5", "ch6", "ch7",
+				"ch8", "ch9", "ch10", "ch11",
+				"ch12", "ch13", "ch14", "ch15",
+				"ch16", "ch17", "ch18", "ch19";
+		#dma-cells = <1>;
+		dma-channels = <20>;
+		dma-requests = <256>;
+	};
+
 	i2c0: i2c@...6820000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
index b8aa795..980dcf3 100644
--- a/arch/arm/mach-shmobile/setup-sh73a0.c
+++ b/arch/arm/mach-shmobile/setup-sh73a0.c
@@ -998,6 +998,7 @@ void __init sh73a0_init_delay(void)
 }
 
 static const struct of_dev_auxdata sh73a0_auxdata_lookup[] __initconst = {
+	OF_DEV_AUXDATA("renesas,shdma", 0xfe000020, "sh-dma-engine.0", &sh73a0_dmae_platform_data),
 	{},
 };
 
@@ -1005,6 +1006,9 @@ void __init sh73a0_add_standard_devices_dt(void)
 {
 	struct platform_device_info devinfo = { .name = "cpufreq-cpu0", .id = -1, };
 
+	/* Clear software reset bit on SY-DMAC module */
+	__raw_writel(__raw_readl(SRCR2) & ~(1 << 18), SRCR2);
+
 	platform_add_devices(sh73a0_devices_dt,
 			     ARRAY_SIZE(sh73a0_devices_dt));
 	of_platform_populate(NULL, of_default_bus_match_table,
-- 
1.7.2.5

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