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-rw-r--r--arch/m32r/include/asm/atomic.h318
1 files changed, 318 insertions, 0 deletions
diff --git a/arch/m32r/include/asm/atomic.h b/arch/m32r/include/asm/atomic.h
new file mode 100644
index 00000000000..2eed30f8408
--- /dev/null
+++ b/arch/m32r/include/asm/atomic.h
@@ -0,0 +1,318 @@
+#ifndef _ASM_M32R_ATOMIC_H
+#define _ASM_M32R_ATOMIC_H
+
+/*
+ * linux/include/asm-m32r/atomic.h
+ *
+ * M32R version:
+ * Copyright (C) 2001, 2002 Hitoshi Yamamoto
+ * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
+ */
+
+#include <linux/types.h>
+#include <asm/assembler.h>
+#include <asm/system.h>
+
+/*
+ * Atomic operations that C can't guarantee us. Useful for
+ * resource counting etc..
+ */
+
+#define ATOMIC_INIT(i) { (i) }
+
+/**
+ * atomic_read - read atomic variable
+ * @v: pointer of type atomic_t
+ *
+ * Atomically reads the value of @v.
+ */
+#define atomic_read(v) ((v)->counter)
+
+/**
+ * atomic_set - set atomic variable
+ * @v: pointer of type atomic_t
+ * @i: required value
+ *
+ * Atomically sets the value of @v to @i.
+ */
+#define atomic_set(v,i) (((v)->counter) = (i))
+
+/**
+ * atomic_add_return - add integer to atomic variable and return it
+ * @i: integer value to add
+ * @v: pointer of type atomic_t
+ *
+ * Atomically adds @i to @v and return (@i + @v).
+ */
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_add_return \n\t"
+ DCACHE_CLEAR("%0", "r4", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "add %0, %2; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (result)
+ : "r" (&v->counter), "r" (i)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+
+ return result;
+}
+
+/**
+ * atomic_sub_return - subtract integer from atomic variable and return it
+ * @i: integer value to subtract
+ * @v: pointer of type atomic_t
+ *
+ * Atomically subtracts @i from @v and return (@v - @i).
+ */
+static __inline__ int atomic_sub_return(int i, atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_sub_return \n\t"
+ DCACHE_CLEAR("%0", "r4", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "sub %0, %2; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (result)
+ : "r" (&v->counter), "r" (i)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+
+ return result;
+}
+
+/**
+ * atomic_add - add integer to atomic variable
+ * @i: integer value to add
+ * @v: pointer of type atomic_t
+ *
+ * Atomically adds @i to @v.
+ */
+#define atomic_add(i,v) ((void) atomic_add_return((i), (v)))
+
+/**
+ * atomic_sub - subtract the atomic variable
+ * @i: integer value to subtract
+ * @v: pointer of type atomic_t
+ *
+ * Atomically subtracts @i from @v.
+ */
+#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v)))
+
+/**
+ * atomic_sub_and_test - subtract value from variable and test result
+ * @i: integer value to subtract
+ * @v: pointer of type atomic_t
+ *
+ * Atomically subtracts @i from @v and returns
+ * true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
+
+/**
+ * atomic_inc_return - increment atomic variable and return it
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1 and returns the result.
+ */
+static __inline__ int atomic_inc_return(atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_inc_return \n\t"
+ DCACHE_CLEAR("%0", "r4", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "addi %0, #1; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (result)
+ : "r" (&v->counter)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+
+ return result;
+}
+
+/**
+ * atomic_dec_return - decrement atomic variable and return it
+ * @v: pointer of type atomic_t
+ *
+ * Atomically decrements @v by 1 and returns the result.
+ */
+static __inline__ int atomic_dec_return(atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_dec_return \n\t"
+ DCACHE_CLEAR("%0", "r4", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "addi %0, #-1; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (result)
+ : "r" (&v->counter)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+
+ return result;
+}
+
+/**
+ * atomic_inc - increment atomic variable
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1.
+ */
+#define atomic_inc(v) ((void)atomic_inc_return(v))
+
+/**
+ * atomic_dec - decrement atomic variable
+ * @v: pointer of type atomic_t
+ *
+ * Atomically decrements @v by 1.
+ */
+#define atomic_dec(v) ((void)atomic_dec_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)
+
+/**
+ * atomic_dec_and_test - decrement and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically decrements @v by 1 and
+ * returns true if the result is 0, or false for all
+ * other cases.
+ */
+#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
+
+/**
+ * atomic_add_negative - add and test if negative
+ * @v: pointer of type atomic_t
+ * @i: integer value to add
+ *
+ * Atomically adds @i to @v and returns true
+ * if the result is negative, or false when
+ * result is greater than or equal to zero.
+ */
+#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
+
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * atomic_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int c, old;
+ c = atomic_read(v);
+ for (;;) {
+ if (unlikely(c == (u)))
+ break;
+ old = atomic_cmpxchg((v), c, c + (a));
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return c != (u);
+}
+
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
+static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr)
+{
+ unsigned long flags;
+ unsigned long tmp;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_clear_mask \n\t"
+ DCACHE_CLEAR("%0", "r5", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "and %0, %2; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (tmp)
+ : "r" (addr), "r" (~mask)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r5"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+}
+
+static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr)
+{
+ unsigned long flags;
+ unsigned long tmp;
+
+ local_irq_save(flags);
+ __asm__ __volatile__ (
+ "# atomic_set_mask \n\t"
+ DCACHE_CLEAR("%0", "r5", "%1")
+ M32R_LOCK" %0, @%1; \n\t"
+ "or %0, %2; \n\t"
+ M32R_UNLOCK" %0, @%1; \n\t"
+ : "=&r" (tmp)
+ : "r" (addr), "r" (mask)
+ : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+ , "r5"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+ );
+ local_irq_restore(flags);
+}
+
+/* Atomic operations are already serializing on m32r */
+#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()
+
+#include <asm-generic/atomic.h>
+#endif /* _ASM_M32R_ATOMIC_H */
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