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authorChris Zankel <chris@zankel.net>2016-08-10 18:36:44 +0300
committerTom Rini <trini@konsulko.com>2016-08-15 18:46:38 -0400
commitc978b52410016b0ab5a213f235596340af8d45f7 (patch)
treeb01e9a8ea9a92fe962a545974339677b87dcc1ba /arch/xtensa/include/asm/atomic.h
parentde5e5cea022ab44006ff1edf45a39f0943fb9dff (diff)
xtensa: add support for the xtensa processor architecture [2/2]
The Xtensa processor architecture is a configurable, extensible, and synthesizable 32-bit RISC processor core provided by Tensilica, inc. This is the second part of the basic architecture port, adding the 'arch/xtensa' directory and a readme file. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/xtensa/include/asm/atomic.h')
-rw-r--r--arch/xtensa/include/asm/atomic.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/atomic.h b/arch/xtensa/include/asm/atomic.h
new file mode 100644
index 0000000000..a75baa09e0
--- /dev/null
+++ b/arch/xtensa/include/asm/atomic.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Cadence Design Systems Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _XTENSA_ATOMIC_H
+#define _XTENSA_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