diff mbox series

[U-Boot,2/5,v2] mips: Add arch/mips/include/asm/atomic.h

Message ID 20180810074819.24962-2-sr@denx.de
State Superseded
Delegated to: Daniel Schwierzeck
Headers show
Series [U-Boot,1/5,v2] mips: Add basic MediaTek MT7620/88 support | expand

Commit Message

Stefan Roese Aug. 10, 2018, 7:48 a.m. UTC 
This is needed for the UBIFS support. The file is a copy of
arch/xtensa/include/asm/atomic.h

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
---
v2:
- No change

 arch/mips/include/asm/atomic.h | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 arch/mips/include/asm/atomic.h
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Patch

diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
new file mode 100644
index 0000000000..7551bf6e6c
--- /dev/null
+++ b/arch/mips/include/asm/atomic.h
@@ -0,0 +1,54 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Cadence Design Systems Inc.
+ */
+
+#ifndef _MIPS_ATOMIC_H
+#define _MIPS_ATOMIC_H
+
+#include <asm/system.h>
+
+typedef struct { volatile int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v, i)	((v)->counter = (i))
+
+static inline void atomic_add(int i, atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	v->counter += i;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_sub(int i, atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	v->counter -= i;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_inc(atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	++v->counter;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_dec(atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	--v->counter;
+	local_irq_restore(flags);
+}
+
+#endif