linux-kernel - [PATCH] MIPS: CPS: Use bitfield helpers

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Date:   Mon, 22 Nov 2021 16:53:58 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] MIPS: CPS: Use bitfield helpers

Use the FIELD_GET() helper, instead of open-coding the same operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only.

See "[PATCH 00/17] Non-const bitfield helper conversions"
(https://lore.kernel.org/r/cover.1637592133.git.geert+renesas@glider.be)
for background and more conversions.
---
 arch/mips/include/asm/mips-cps.h | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/arch/mips/include/asm/mips-cps.h b/arch/mips/include/asm/mips-cps.h
index fd43d876892ec4c6..c077e8d100f584f9 100644
--- a/arch/mips/include/asm/mips-cps.h
+++ b/arch/mips/include/asm/mips-cps.h
@@ -7,6 +7,7 @@
 #ifndef __MIPS_ASM_MIPS_CPS_H__
 #define __MIPS_ASM_MIPS_CPS_H__
 
+#include <linux/bitfield.h>
 #include <linux/io.h>
 #include <linux/types.h>
 
@@ -112,14 +113,10 @@ static inline void clear_##unit##_##name(uint##sz##_t val)		\
  */
 static inline unsigned int mips_cps_numclusters(void)
 {
-	unsigned int num_clusters;
-
 	if (mips_cm_revision() < CM_REV_CM3_5)
 		return 1;
 
-	num_clusters = read_gcr_config() & CM_GCR_CONFIG_NUM_CLUSTERS;
-	num_clusters >>= __ffs(CM_GCR_CONFIG_NUM_CLUSTERS);
-	return num_clusters;
+	return FIELD_GET(CM_GCR_CONFIG_NUM_CLUSTERS, read_gcr_config());
 }
 
 /**
@@ -169,7 +166,8 @@ static inline unsigned int mips_cps_numcores(unsigned int cluster)
 		return 0;
 
 	/* Add one before masking to handle 0xff indicating no cores */
-	return (mips_cps_cluster_config(cluster) + 1) & CM_GCR_CONFIG_PCORES;
+	return FIELD_GET(CM_GCR_CONFIG_PCORES,
+			 mips_cps_cluster_config(cluster) + 1);
 }
 
 /**
@@ -181,14 +179,11 @@ static inline unsigned int mips_cps_numcores(unsigned int cluster)
  */
 static inline unsigned int mips_cps_numiocu(unsigned int cluster)
 {
-	unsigned int num_iocu;
-
 	if (!mips_cm_present())
 		return 0;
 
-	num_iocu = mips_cps_cluster_config(cluster) & CM_GCR_CONFIG_NUMIOCU;
-	num_iocu >>= __ffs(CM_GCR_CONFIG_NUMIOCU);
-	return num_iocu;
+	return FIELD_GET(CM_GCR_CONFIG_NUMIOCU,
+			 mips_cps_cluster_config(cluster));
 }
 
 /**
@@ -230,7 +225,7 @@ static inline unsigned int mips_cps_numvps(unsigned int cluster, unsigned int co
 
 	mips_cm_unlock_other();
 
-	return (cfg + 1) & CM_GCR_Cx_CONFIG_PVPE;
+	return FIELD_GET(CM_GCR_Cx_CONFIG_PVPE, cfg + 1);
 }
 
 #endif /* __MIPS_ASM_MIPS_CPS_H__ */
-- 
2.25.1