From: Mark Brown <broonie@kernel.org>
Date: Tue, 3 May 2022 17:02:22 +0000 (+0100)
Subject: arm64/sysreg: Introduce helpers for access to sysreg fields
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e6a6b34f97efe3ded077b31f4370b4c1206c9e56;p=linux.git

arm64/sysreg: Introduce helpers for access to sysreg fields

The macros we define for the bitfields within sysregs have very regular
names, especially once we switch to automatic generation of those macros.
Take advantage of this to define wrappers around FIELD_PREP() allowing
us to simplify setting values in fields either numerically

   SYS_FIELD_PREP(SCTLR_EL1, TCF0, 0x0)

or using the values of enumerations within the fields

   SYS_FIELD_PREP_ENUM(SCTLR_EL1, TCF0, ASYMM)

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220503170233.507788-2-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index fbf5f8bb90555..8543a315c5caa 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -1345,4 +1345,10 @@
 
 #endif
 
+#define SYS_FIELD_PREP(reg, field, val)		\
+		 FIELD_PREP(reg##_##field##_MASK, val)
+
+#define SYS_FIELD_PREP_ENUM(reg, field, val)		\
+		 FIELD_PREP(reg##_##field##_MASK, reg##_##field##_##val)
+
 #endif	/* __ASM_SYSREG_H */