linux-kernel - [PATCH v2 1/2] ARM: add CLIDR accessor functions

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Message-Id: <20241014-armv7-cacheinfo-v2-1-38ab76d2b7fa@linaro.org>
Date: Mon, 14 Oct 2024 16:55:20 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sudeep Holla <sudeep.holla@....com>, Ard Biesheuvel <ardb@...nel.org>, 
 Russell King <linux@...linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2 1/2] ARM: add CLIDR accessor functions

Add functions to read the CLIDR, Cache Level ID Register.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 arch/arm/include/asm/cachetype.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/include/asm/cachetype.h b/arch/arm/include/asm/cachetype.h
index b9dbe1d4c8fe..b01c59076b84 100644
--- a/arch/arm/include/asm/cachetype.h
+++ b/arch/arm/include/asm/cachetype.h
@@ -83,6 +83,14 @@ static inline unsigned int read_ccsidr(void)
 	asm volatile("mrc p15, 1, %0, c0, c0, 0" : "=r" (val));
 	return val;
 }
+
+static inline unsigned int read_clidr(void)
+{
+	unsigned int val;
+
+	asm volatile("mrc p15, 1, %0, c0, c0, 1" : "=r" (val));
+	return val;
+}
 #else /* CONFIG_CPU_V7M */
 #include <linux/io.h>
 #include "asm/v7m.h"
@@ -96,6 +104,11 @@ static inline unsigned int read_ccsidr(void)
 {
 	return readl(BASEADDR_V7M_SCB + V7M_SCB_CCSIDR);
 }
+
+static inline unsigned int read_clidr(void)
+{
+	return readl(BASEADDR_V7M_SCB + V7M_SCB_CLIDR);
+}
 #endif
 
 #endif

-- 
2.39.5