1 files changed, 68 insertions, 0 deletions

diff --git a/arch/c6x/include/asm/cmpxchg.h b/arch/c6x/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..b27c8cefb8c3
--- /dev/null
+++ b/arch/c6x/include/asm/cmpxchg.h
@@ -0,0 +1,68 @@
+/*
+ *  Port on Texas Instruments TMS320C6x architecture
+ *
+ *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
+ *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ *  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.
+ */
+#ifndef _ASM_C6X_CMPXCHG_H
+#define _ASM_C6X_CMPXCHG_H
+
+#include <linux/irqflags.h>
+
+/*
+ * Misc. functions
+ */
+static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
+{
+        unsigned int tmp;
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        switch (size) {
+        case 1:
+                tmp = 0;
+                tmp = *((unsigned char *) ptr);
+                *((unsigned char *) ptr) = (unsigned char) x;
+                break;
+        case 2:
+                tmp = 0;
+                tmp = *((unsigned short *) ptr);
+                *((unsigned short *) ptr) = x;
+                break;
+        case 4:
+                tmp = 0;
+                tmp = *((unsigned int *) ptr);
+                *((unsigned int *) ptr) = x;
+                break;
+        }
+        local_irq_restore(flags);
+        return tmp;
+}
+
+#define xchg(ptr, x) \
+        ((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
+                                    sizeof(*(ptr))))
+#define tas(ptr)    xchg((ptr), 1)
+
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)                                        \
+        ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),             \
+                                                     (unsigned long)(o), \
+                                                     (unsigned long)(n), \
+                                                     sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#include <asm-generic/cmpxchg.h>
+
+#endif /* _ASM_C6X_CMPXCHG_H */