linux-kernel - [PATCH 7/9] arm64: dts: apple: t8011: Add cpufreq nodes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241222175314.151437-8-towinchenmi@gmail.com>
Date: Mon, 23 Dec 2024 01:52:07 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Nick Chan <towinchenmi@...il.com>
Subject: [PATCH 7/9] arm64: dts: apple: t8011: Add cpufreq nodes

Add cpufreq nodes for Apple A10 SoC. There is a transparent hardware
big.LITTLE switcher in this SoC. Spoof E-core p-state frequencies such
that CPU capacity does not appear to change when switching between core
types.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 arch/arm64/boot/dts/apple/t8011.dtsi | 79 ++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8011.dtsi b/arch/arm64/boot/dts/apple/t8011.dtsi
index 6c4ed9dc4a50..3a3d5b615a6a 100644
--- a/arch/arm64/boot/dts/apple/t8011.dtsi
+++ b/arch/arm64/boot/dts/apple/t8011.dtsi
@@ -32,6 +32,8 @@ cpu0: cpu@0 {
 			compatible = "apple,hurricane-zephyr";
 			reg = <0x0 0x0>;
 			cpu-release-addr = <0 0>; /* To be filled by loader */
+			operating-points-v2 = <&fusion_opp>;
+			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
 		};
@@ -40,6 +42,8 @@ cpu1: cpu@1 {
 			compatible = "apple,hurricane-zephyr";
 			reg = <0x0 0x1>;
 			cpu-release-addr = <0 0>; /* To be filled by loader */
+			operating-points-v2 = <&fusion_opp>;
+			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
 		};
@@ -48,11 +52,80 @@ cpu2: cpu@2 {
 			compatible = "apple,hurricane-zephyr";
 			reg = <0x0 0x2>;
 			cpu-release-addr = <0 0>; /* To be filled by loader */
+			operating-points-v2 = <&fusion_opp>;
+			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
 		};
 	};
 
+	fusion_opp: opp-table {
+		compatible = "operating-points-v2";
+
+		/*
+		 * Apple Fusion Architecture: Hardwired big.LITTLE switcher
+		 * that use p-state transitions to switch between cores.
+		 *
+		 * The E-core frequencies are adjusted so performance scales
+		 * linearly with reported clock speed.
+		 */
+
+		opp01 {
+			opp-hz = /bits/ 64 <172000000>; /* 300 MHz, E-core */
+			opp-level = <1>;
+			clock-latency-ns = <12000>;
+		};
+		opp02 {
+			opp-hz = /bits/ 64 <230000000>; /* 396 MHz, E-core */
+			opp-level = <2>;
+			clock-latency-ns = <135000>;
+		};
+		opp03 {
+			opp-hz = /bits/ 64 <448000000>; /* 768 MHz, E-core */
+			opp-level = <3>;
+			clock-latency-ns = <105000>;
+		};
+		opp04 {
+			opp-hz = /bits/ 64 <662000000>; /* 1152 MHz, E-core */
+			opp-level = <4>;
+			clock-latency-ns = <115000>;
+		};
+		opp05 {
+			opp-hz = /bits/ 64 <804000000>;
+			opp-level = <5>;
+			clock-latency-ns = <122000>;
+		};
+		opp06 {
+			opp-hz = /bits/ 64 <1140000000>;
+			opp-level = <6>;
+			clock-latency-ns = <120000>;
+		};
+		opp07 {
+			opp-hz = /bits/ 64 <1548000000>;
+			opp-level = <7>;
+			clock-latency-ns = <125000>;
+		};
+		opp08 {
+			opp-hz = /bits/ 64 <1956000000>;
+			opp-level = <8>;
+			clock-latency-ns = <135000>;
+		};
+		opp09 {
+			opp-hz = /bits/ 64 <2316000000>;
+			opp-level = <9>;
+			clock-latency-ns = <140000>;
+		};
+#if 0
+		/* Not available until CPU deep sleep is implemented */
+		opp10 {
+			opp-hz = /bits/ 64 <2400000000>;
+			opp-level = <10>;
+			clock-latency-ns = <140000>;
+			turbo-mode;
+		};
+#endif
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;
@@ -60,6 +133,12 @@ soc {
 		nonposted-mmio;
 		ranges;
 
+		cpufreq: performance-controller@...f20000 {
+			compatible = "apple,t8010-cluster-cpufreq", "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
+			reg = <0x2 0x02f20000 0 0x1000>;
+			#performance-domain-cells = <0>;
+		};
+
 		serial0: serial@...0c0000 {
 			compatible = "apple,s5l-uart";
 			reg = <0x2 0x0a0c0000 0x0 0x4000>;
-- 
2.47.1