1 files changed, 93 insertions, 0 deletions
diff --git a/include/asm-arm26/atomic.h b/include/asm-arm26/atomic.h
new file mode 100644
index 00000000000..4a88235c0e7
--- /dev/null
+++ b/include/asm-arm26/atomic.h
@@ -0,0 +1,93 @@
+/*
+ *  linux/include/asm-arm26/atomic.h
+ *
+ *  Copyright (c) 1996 Russell King.
+ *  Modified for arm26 by Ian Molton
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Changelog:
+ *   25-11-2004 IM	Updated for 2.6.9
+ *   27-06-1996	RMK	Created
+ *   13-04-1997	RMK	Made functions atomic!
+ *   07-12-1997	RMK	Upgraded for v2.1.
+ *   26-08-1998	PJB	Added #ifdef __KERNEL__
+ *
+ *  FIXME - its probably worth seeing what these compile into...
+ */
+#ifndef __ASM_ARM_ATOMIC_H
+#define __ASM_ARM_ATOMIC_H
+
+#include <linux/config.h>
+
+#ifdef CONFIG_SMP
+#error SMP is NOT supported
+#endif
+
+typedef struct { volatile int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#ifdef __KERNEL__
+#include <asm/system.h>
+
+#define atomic_read(v) ((v)->counter)
+#define atomic_set(v,i)	(((v)->counter) = (i))
+
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+        unsigned long flags;
+        int val;
+
+        local_irq_save(flags);
+        val = v->counter;
+        v->counter = val += i;
+        local_irq_restore(flags);
+
+        return val;
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+        unsigned long flags;
+        int val;
+
+        local_irq_save(flags);
+        val = v->counter;
+        v->counter = val -= i;
+        local_irq_restore(flags);
+
+        return val;
+}
+
+static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        *addr &= ~mask;
+        local_irq_restore(flags);
+}
+
+#define atomic_add(i, v)        (void) atomic_add_return(i, v)
+#define atomic_inc(v)           (void) atomic_add_return(1, v)
+#define atomic_sub(i, v)        (void) atomic_sub_return(i, v)
+#define atomic_dec(v)           (void) atomic_sub_return(1, v)
+
+#define atomic_inc_and_test(v)  (atomic_add_return(1, v) == 0)
+#define atomic_dec_and_test(v)  (atomic_sub_return(1, v) == 0)
+#define atomic_inc_return(v)    (atomic_add_return(1, v))
+#define atomic_dec_return(v)    (atomic_sub_return(1, v))
+
+#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
+
+/* Atomic operations are already serializing on ARM26 */
+#define smp_mb__before_atomic_dec()	barrier()
+#define smp_mb__after_atomic_dec()	barrier()
+#define smp_mb__before_atomic_inc()	barrier()
+#define smp_mb__after_atomic_inc()	barrier()
+
+#endif
+#endif