linux-kernel - [PATCH v2 13/25] arm64: Add Apple vendor-specific system registers

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Message-Id: <20210215121713.57687-14-marcan@marcan.st>
Date:   Mon, 15 Feb 2021 21:17:01 +0900
From:   Hector Martin <marcan@...can.st>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Hector Martin <marcan@...can.st>, Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 13/25] arm64: Add Apple vendor-specific system registers

Apple ARM64 SoCs have a ton of vendor-specific registers we're going to
have to deal with, and those don't really belong in sysreg.h with all
the architectural registers. Make a new home for them, and add some
registers which are useful for early bring-up.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 MAINTAINERS                           |  1 +
 arch/arm64/include/asm/sysreg_apple.h | 69 +++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 arch/arm64/include/asm/sysreg_apple.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 4eba6ab16bd9..1431fd59025f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1634,6 +1634,7 @@ B:	https://github.com/AsahiLinux/linux/issues
 C:	irc://chat.freenode.net/asahi-dev
 T:	git https://github.com/AsahiLinux/linux.git
 F:	Documentation/devicetree/bindings/arm/apple.yaml
+F:	arch/arm64/include/asm/sysreg_apple.h
 
 ARM/ARTPEC MACHINE SUPPORT
 M:	Jesper Nilsson <jesper.nilsson@...s.com>
diff --git a/arch/arm64/include/asm/sysreg_apple.h b/arch/arm64/include/asm/sysreg_apple.h
new file mode 100644
index 000000000000..2068a3436a70
--- /dev/null
+++ b/arch/arm64/include/asm/sysreg_apple.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple SoC vendor-defined system register definitions
+ *
+ * Copyright The Asahi Linux Contributors
+
+ * This file contains only well-understood registers that are useful to
+ * Linux. If you are looking for things to add here, you should visit:
+ *
+ * https://github.com/AsahiLinux/docs/wiki/HW:ARM-System-Registers
+ */
+
+#ifndef __ASM_SYSREG_APPLE_H
+#define __ASM_SYSREG_APPLE_H
+
+#include <asm/sysreg.h>
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+
+/*
+ * Keep these registers in encoding order, except for register arrays;
+ * those should be listed in array order starting from the position of
+ * the encoding of the first register.
+ */
+
+#define SYS_APL_PMCR0			sys_reg(3, 1, 15, 0, 0)
+#define PMCR0_IMODE			GENMASK(10, 8)
+#define PMCR0_IMODE_OFF			0
+#define PMCR0_IMODE_PMI			1
+#define PMCR0_IMODE_AIC			2
+#define PMCR0_IMODE_HALT		3
+#define PMCR0_IMODE_FIQ			4
+#define PMCR0_IACT			BIT(11)
+
+/* IPI request registers */
+#define SYS_APL_IPI_RR_LOCAL		sys_reg(3, 5, 15, 0, 0)
+#define SYS_APL_IPI_RR_GLOBAL		sys_reg(3, 5, 15, 0, 1)
+#define IPI_RR_CPU			GENMASK(7, 0)
+/* Cluster only used for the GLOBAL register */
+#define IPI_RR_CLUSTER			GENMASK(23, 16)
+#define IPI_RR_TYPE			GENMASK(29, 28)
+#define IPI_RR_IMMEDIATE		0
+#define IPI_RR_RETRACT			1
+#define IPI_RR_DEFERRED			2
+#define IPI_RR_NOWAKE			3
+
+/* IPI status register */
+#define SYS_APL_IPI_SR			sys_reg(3, 5, 15, 1, 1)
+#define IPI_SR_PENDING			BIT(0)
+
+/* Guest timer FIQ mask register */
+#define SYS_APL_VM_TMR_MASK		sys_reg(3, 5, 15, 1, 3)
+#define VM_TMR_MASK_V			BIT(0)
+#define VM_TMR_MASK_P			BIT(1)
+
+/* Deferred IPI countdown register */
+#define SYS_APL_IPI_CR			sys_reg(3, 5, 15, 3, 1)
+
+#define SYS_APL_UPMCR0			sys_reg(3, 7, 15, 0, 4)
+#define UPMCR0_IMODE			GENMASK(18, 16)
+#define UPMCR0_IMODE_OFF		0
+#define UPMCR0_IMODE_AIC		2
+#define UPMCR0_IMODE_HALT		3
+#define UPMCR0_IMODE_FIQ		4
+
+#define SYS_APL_UPMSR			sys_reg(3, 7, 15, 6, 4)
+#define UPMSR_IACT			BIT(0)
+
+#endif	/* __ASM_SYSREG_APPLE_H */
-- 
2.30.0