1 files changed, 113 insertions, 0 deletions
diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h
new file mode 100644
index 0000000..7230f65
--- /dev/null
+++ b/include/asm-h8300/atomic.h
@@ -0,0 +1,113 @@
+#ifndef __ARCH_H8300_ATOMIC__
+#define __ARCH_H8300_ATOMIC__
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+typedef struct { int counter; } atomic_t;
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v, i)	(((v)->counter) = i)
+
+#include <asm/system.h>
+#include <linux/kernel.h>
+
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+	int ret,flags;
+	local_irq_save(flags);
+	ret = v->counter += i;
+	local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_add(i, v) atomic_add_return(i, v)
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+static __inline__ int atomic_sub_return(int i, atomic_t *v)
+{
+	int ret,flags;
+	local_irq_save(flags);
+	ret = v->counter -= i;
+	local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_sub(i, v) atomic_sub_return(i, v)
+
+static __inline__ int atomic_inc_return(atomic_t *v)
+{
+	int ret,flags;
+	local_irq_save(flags);
+	v->counter++;
+	ret = v->counter;
+	local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_inc(v) atomic_inc_return(v)
+
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+
+static __inline__ int atomic_dec_return(atomic_t *v)
+{
+	int ret,flags;
+	local_irq_save(flags);
+	--v->counter;
+	ret = v->counter;
+	local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_dec(v) atomic_dec_return(v)
+
+static __inline__ int atomic_dec_and_test(atomic_t *v)
+{
+	int ret,flags;
+	local_irq_save(flags);
+	--v->counter;
+	ret = v->counter;
+	local_irq_restore(flags);
+	return ret == 0;
+}
+
+static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
+{
+	__asm__ __volatile__("stc ccr,r1l\n\t"
+	                     "orc #0x80,ccr\n\t"
+	                     "mov.l %0,er0\n\t"
+	                     "and.l %1,er0\n\t"
+	                     "mov.l er0,%0\n\t"
+	                     "ldc r1l,ccr" 
+                             : "=m" (*v) : "g" (~(mask)) :"er0","er1");
+}
+
+static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
+{
+	__asm__ __volatile__("stc ccr,r1l\n\t"
+	                     "orc #0x80,ccr\n\t"
+	                     "mov.l %0,er0\n\t"
+	                     "or.l %1,er0\n\t"
+	                     "mov.l er0,%0\n\t"
+	                     "ldc r1l,ccr" 
+                             : "=m" (*v) : "g" (mask) :"er0","er1");
+}
+
+/* Atomic operations are already serializing */
+#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 /* __ARCH_H8300_ATOMIC __ */