powerpc/85xx: describe the PAMU topology in the device tree

The PAMU caches use the LIODNs to determine which cache lines hold the
entries for the corresponding LIODs.  The LIODNs must therefore be
carefully assigned to avoid cache thrashing -- two active LIODs with
LIODNs that put them in the same cache line.

Currently, LIODNs are statically assigned by U-Boot, but this has
limitations.  LIODNs are assigned even for devices that may be disabled
or unused by the kernel.  Static assignments also do not allow for device
drivers which may know which LIODs can be used simultaneously.  In
other words, we really should assign LIODNs dynamically in Linux.

To do that, we need to describe the PAMU device and cache topologies in
the device trees.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Stuart Yoder <stuart.yoder@freescale.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 67 insertions, 1 deletions

diff --git a/arch/powerpc/boot/dts/fsl/p4080si-post.dtsi b/arch/powerpc/boot/dts/fsl/p4080si-post.dtsi
index 4f9c9f682ec..dc82bcfa2f6 100644
--- a/arch/powerpc/boot/dts/fsl/p4080si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p4080si-post.dtsi
@@ -48,6 +48,8 @@
 	bus-range = <0x0 0xff>;
 	clock-frequency = <33333333>;
 	interrupts = <16 2 1 15>;
+	fsl,iommu-parent = <&pamu0>;
+	fsl,liodn-reg = <&guts 0x500>; /* PEX1LIODNR */
 	pcie@0 {
 		reg = <0 0 0 0 0>;
 		#interrupt-cells = <1>;
@@ -75,6 +77,8 @@
 	bus-range = <0 0xff>;
 	clock-frequency = <33333333>;
 	interrupts = <16 2 1 14>;
+	fsl,iommu-parent = <&pamu0>;
+	fsl,liodn-reg = <&guts 0x504>; /* PEX2LIODNR */
 	pcie@0 {
 		reg = <0 0 0 0 0>;
 		#interrupt-cells = <1>;
@@ -102,6 +106,8 @@
 	bus-range = <0x0 0xff>;
 	clock-frequency = <33333333>;
 	interrupts = <16 2 1 13>;
+	fsl,iommu-parent = <&pamu0>;
+	fsl,liodn-reg = <&guts 0x508>; /* PEX3LIODNR */
 	pcie@0 {
 		reg = <0 0 0 0 0>;
 		#interrupt-cells = <1>;
@@ -126,18 +132,21 @@
 	#address-cells = <2>;
 	#size-cells = <2>;
 	fsl,srio-rmu-handle = <&rmu>;
+	fsl,iommu-parent = <&pamu0>;
 	ranges;
 
 	port1 {
 		#address-cells = <2>;
 		#size-cells = <2>;
 		cell-index = <1>;
+		fsl,liodn-reg = <&guts 0x510>; /* RIO1LIODNR */
 	};
 
 	port2 {
 		#address-cells = <2>;
 		#size-cells = <2>;
 		cell-index = <2>;
+		fsl,liodn-reg = <&guts 0x514>; /* RIO2LIODNR */
 	};
 };
 
@@ -281,13 +290,51 @@
 
 	iommu@20000 {
 		compatible = "fsl,pamu-v1.0", "fsl,pamu";
-		reg = <0x20000 0x5000>;
+		reg = <0x20000 0x5000>; /* for compatibility with older PAMU drivers */
+		ranges = <0 0x20000 0x5000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 		interrupts = <
 			24 2 0 0
 			16 2 1 30>;
+
+		pamu0: pamu@0 {
+			reg = <0 0x1000>;
+			fsl,primary-cache-geometry = <32 1>;
+			fsl,secondary-cache-geometry = <128 2>;
+		};
+
+		pamu1: pamu@1000 {
+			reg = <0x1000 0x1000>;
+			fsl,primary-cache-geometry = <32 1>;
+			fsl,secondary-cache-geometry = <128 2>;
+		};
+
+		pamu2: pamu@2000 {
+			reg = <0x2000 0x1000>;
+			fsl,primary-cache-geometry = <32 1>;
+			fsl,secondary-cache-geometry = <128 2>;
+		};
+
+		pamu3: pamu@3000 {
+			reg = <0x3000 0x1000>;
+			fsl,primary-cache-geometry = <32 1>;
+			fsl,secondary-cache-geometry = <128 2>;
+		};
+
+		pamu4: pamu@4000 {
+			reg = <0x4000 0x1000>;
+			fsl,primary-cache-geometry = <32 1>;
+			fsl,secondary-cache-geometry = <128 2>;
+		};
 	};
 
 /include/ "qoriq-rmu-0.dtsi"
+	rmu@d3000 {
+		fsl,iommu-parent = <&pamu0>;
+		fsl,liodn-reg = <&guts 0x540>; /* RMULIODNR */
+	};
+
 /include/ "qoriq-mpic.dtsi"
 
 	guts: global-utilities@e0000 {
@@ -327,7 +374,17 @@
 	};
 
 /include/ "qoriq-dma-0.dtsi"
+	dma@100300 {
+		fsl,iommu-parent = <&pamu0>;
+		fsl,liodn-reg = <&guts 0x580>; /* DMA1LIODNR */
+	};
+
 /include/ "qoriq-dma-1.dtsi"
+	dma@101300 {
+		fsl,iommu-parent = <&pamu0>;
+		fsl,liodn-reg = <&guts 0x584>; /* DMA2LIODNR */
+	};
+
 /include/ "qoriq-espi-0.dtsi"
 	spi@110000 {
 		fsl,espi-num-chipselects = <4>;
@@ -335,6 +392,8 @@
 
 /include/ "qoriq-esdhc-0.dtsi"
 	sdhc@114000 {
+		fsl,iommu-parent = <&pamu1>;
+		fsl,liodn-reg = <&guts 0x530>; /* eSDHCLIODNR */
 		voltage-ranges = <3300 3300>;
 		sdhci,auto-cmd12;
 	};
@@ -347,11 +406,18 @@
 /include/ "qoriq-usb2-mph-0.dtsi"
 	usb@210000 {
 		compatible = "fsl-usb2-mph-v1.6", "fsl,mpc85xx-usb2-mph", "fsl-usb2-mph";
+		fsl,iommu-parent = <&pamu1>;
+		fsl,liodn-reg = <&guts 0x520>; /* USB1LIODNR */
 		port0;
 	};
 /include/ "qoriq-usb2-dr-0.dtsi"
 	usb@211000 {
 		compatible = "fsl-usb2-dr-v1.6", "fsl,mpc85xx-usb2-dr", "fsl-usb2-dr";
+		fsl,iommu-parent = <&pamu1>;
+		fsl,liodn-reg = <&guts 0x524>; /* USB2LIODNR */
 	};
 /include/ "qoriq-sec4.0-0.dtsi"
+crypto: crypto@300000 {
+		fsl,iommu-parent = <&pamu1>;
+	};
 };