From: Thierry Reding <treding@nvidia.com>
Date: Mon, 13 Dec 2021 16:21:50 +0000 (+0100)
Subject: arm64: tegra: Add memory controller on Tegra234
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eed280dfe91d84d6b9ad62e47d1b69aa8d9b4db2;p=linux.git

arm64: tegra: Add memory controller on Tegra234

This adds the memory controller and the embedded external memory
controller found on the Tegra234 SoC.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
index b60e4f6f06580..59ad115369bda 100644
--- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
@@ -3,6 +3,7 @@
 #include <dt-bindings/clock/tegra234-clock.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/mailbox/tegra186-hsp.h>
+#include <dt-bindings/memory/tegra234-mc.h>
 #include <dt-bindings/reset/tegra234-reset.h>
 
 / {
@@ -84,6 +85,54 @@
 			gpio-controller;
 		};
 
+		mc: memory-controller@2c00000 {
+			compatible = "nvidia,tegra234-mc";
+			reg = <0x02c00000 0x100000>,
+			      <0x02b80000 0x040000>,
+			      <0x01700000 0x100000>;
+			interrupts = <GIC_SPI 223 IRQ_TYPE_LEVEL_HIGH>;
+			#interconnect-cells = <1>;
+			status = "okay";
+
+			#address-cells = <2>;
+			#size-cells = <2>;
+
+			ranges = <0x01700000 0x0 0x01700000 0x0 0x100000>,
+				 <0x02b80000 0x0 0x02b80000 0x0 0x040000>,
+				 <0x02c00000 0x0 0x02c00000 0x0 0x100000>;
+
+			/*
+			 * Bit 39 of addresses passing through the memory
+			 * controller selects the XBAR format used when memory
+			 * is accessed. This is used to transparently access
+			 * memory in the XBAR format used by the discrete GPU
+			 * (bit 39 set) or Tegra (bit 39 clear).
+			 *
+			 * As a consequence, the operating system must ensure
+			 * that bit 39 is never used implicitly, for example
+			 * via an I/O virtual address mapping of an IOMMU. If
+			 * devices require access to the XBAR switch, their
+			 * drivers must set this bit explicitly.
+			 *
+			 * Limit the DMA range for memory clients to [38:0].
+			 */
+			dma-ranges = <0x0 0x0 0x0 0x80 0x0>;
+
+			emc: external-memory-controller@2c60000 {
+				compatible = "nvidia,tegra234-emc";
+				reg = <0x0 0x02c60000 0x0 0x90000>,
+				      <0x0 0x01780000 0x0 0x80000>;
+				interrupts = <GIC_SPI 224 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&bpmp TEGRA234_CLK_EMC>;
+				clock-names = "emc";
+				status = "okay";
+
+				#interconnect-cells = <0>;
+
+				nvidia,bpmp = <&bpmp>;
+			};
+		};
+
 		uarta: serial@3100000 {
 			compatible = "nvidia,tegra234-uart", "nvidia,tegra20-uart";
 			reg = <0x03100000 0x10000>;