[PATCH v6 25/25] ARM: dts: exynos: add iommu reserved regions for bootloader's splash screen

From: Marek Szyprowski <m.szyprowski@samsung.com>
To: iommu@lists.linux-foundation.org,
	linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	linaro-mm-sig@lists.linaro.org, Arnd Bergmann <arnd@arndb.de>,
	Shaik Ameer Basha <shaik.ameer@samsung.com>,
	Cho KyongHo <pullip.cho@samsung.com>,
	Joerg Roedel <joro@8bytes.org>,
	Thierry Reding <treding@nvidia.com>,
	Olof Johansson <olof@lixom.net>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh@kernel.org>, Will Deacon <will.deacon@arm.com>,
	David Wodhouse <dwmw2@infradead.org>,
	Inki Dae <inki.dae@samsung.com>, Kukjin Kim <kgene@kernel.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Joonyoung Shim <jy0922.shim@samsung.com>,
	Seung-Woo Kim <sw0312.kim@samsung.com>,
	Javier Martinez Canillas <javier@dowhile0.org>
Subject: [PATCH v6 25/25] ARM: dts: exynos: add iommu reserved regions for bootloader's splash screen
Date: Mon, 04 May 2015 10:16:20 +0200	[thread overview]
Message-ID: <1430727380-10912-26-git-send-email-m.szyprowski@samsung.com> (raw)
In-Reply-To: <1430727380-10912-1-git-send-email-m.szyprowski@samsung.com>

Some bootloaders enable FIMD module and configure it as a simple
framebuffer to display boot logo or splash screen before booting the
kernel. Such framebuffer stays enabled until proper kernel driver gets
probbed. Usually it is configured in such a way, that it performs DMA
from the buffer located in system memory. To avoid IOMMU access fault
during system boot, additional identity mapping between system memory
and IO virtual address space must be created when IOMMU driver gets
enabled.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 arch/arm/boot/dts/exynos3250-rinato.dts         | 1 +
 arch/arm/boot/dts/exynos4210-trats.dts          | 1 +
 arch/arm/boot/dts/exynos4210-universal_c210.dts | 1 +
 arch/arm/boot/dts/exynos4412-trats2.dts         | 1 +
 arch/arm/boot/dts/exynos5250-snow.dts           | 1 +
 arch/arm/boot/dts/exynos5250-spring.dts         | 1 +
 arch/arm/boot/dts/exynos5420-peach-pit.dts      | 1 +
 arch/arm/boot/dts/exynos5800-peach-pi.dts       | 1 +
 8 files changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/exynos3250-rinato.dts b/arch/arm/boot/dts/exynos3250-rinato.dts
index 0b9906880c0c..71641f47f6bb 100644
--- a/arch/arm/boot/dts/exynos3250-rinato.dts
+++ b/arch/arm/boot/dts/exynos3250-rinato.dts
@@ -203,6 +203,7 @@
 
 &fimd {
 	status = "okay";
+	iommu-reserved-mapping = <0x40000000 0x40000000 0x1ff00000>;
 
 	i80-if-timings {
 		cs-setup = <0>;
diff --git a/arch/arm/boot/dts/exynos4210-trats.dts b/arch/arm/boot/dts/exynos4210-trats.dts
index 32c5fd8f6269..becc84b881a6 100644
--- a/arch/arm/boot/dts/exynos4210-trats.dts
+++ b/arch/arm/boot/dts/exynos4210-trats.dts
@@ -424,6 +424,7 @@
 
 	fimd@11c00000 {
 		status = "okay";
+		iommu-reserved-mapping = <0x40000000 0x40000000 0x40000000>;
 	};
 
 	tmu@100C0000 {
diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
index d4f2b11319dd..ecc95263ff4c 100644
--- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
@@ -450,6 +450,7 @@
 		pinctrl-0 = <&lcd_clk>, <&lcd_data24>;
 		pinctrl-names = "default";
 		status = "okay";
+		iommu-reserved-mapping = <0x40000000 0x40000000 0x20000000>;
 		samsung,invert-vden;
 		samsung,invert-vclk;
 		#address-cells = <1>;
diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts
index 173ffa479ad3..78532629f396 100644
--- a/arch/arm/boot/dts/exynos4412-trats2.dts
+++ b/arch/arm/boot/dts/exynos4412-trats2.dts
@@ -758,6 +758,7 @@
 
 	fimd@11c00000 {
 		status = "okay";
+		iommu-reserved-mapping = <0x40000000 0x40000000 0x40000000>;
 	};
 
 	camera: camera {
diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts
index 2657e842e5a5..9f2e992cb396 100644
--- a/arch/arm/boot/dts/exynos5250-snow.dts
+++ b/arch/arm/boot/dts/exynos5250-snow.dts
@@ -286,6 +286,7 @@
 
 &fimd {
 	status = "okay";
+	iommu-reserved-mapping = <0x40000000 0x40000000 0x80000000>;
 	samsung,invert-vclk;
 };
 
diff --git a/arch/arm/boot/dts/exynos5250-spring.dts b/arch/arm/boot/dts/exynos5250-spring.dts
index d03f9b8d376d..334d98925d4b 100644
--- a/arch/arm/boot/dts/exynos5250-spring.dts
+++ b/arch/arm/boot/dts/exynos5250-spring.dts
@@ -84,6 +84,7 @@
 
 &fimd {
 	status = "okay";
+	iommu-reserved-mapping = <0x40000000 0x40000000 0x80000000>;
 	samsung,invert-vclk;
 };
 
diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index 0788d08fb43e..edc3976665d0 100644
--- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
+++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
@@ -166,6 +166,7 @@
 
 &fimd {
 	status = "okay";
+	iommu-reserved-mapping = <0x20000000 0x20000000 0x80000000>;
 	samsung,invert-vclk;
 };
 
diff --git a/arch/arm/boot/dts/exynos5800-peach-pi.dts b/arch/arm/boot/dts/exynos5800-peach-pi.dts
index 412f41d62686..ac5a67a3ce48 100644
--- a/arch/arm/boot/dts/exynos5800-peach-pi.dts
+++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts
@@ -153,6 +153,7 @@
 
 &fimd {
 	status = "okay";
+	iommu-reserved-mapping = <0x20000000 0x20000000 0x80000000>;
 	samsung,invert-vclk;
 };
 
-- 
1.9.2
