Move all of include/asm-m68knommu to arch/m68knommu/include/asm.

[linux-2.6-omap-h63xx.git] / arch / m68knommu / include / asm / delay.h

diff --git a/arch/m68knommu/include/asm/delay.h b/arch/m68knommu/include/asm/delay.h
new file mode 100644 (file)
index 0000000..55cbd62
--- /dev/null
+++ b/arch/m68knommu/include/asm/delay.h
@@ -0,0 +1,76 @@
+#ifndef _M68KNOMMU_DELAY_H
+#define _M68KNOMMU_DELAY_H
+
+/*
+ * Copyright (C) 1994 Hamish Macdonald
+ * Copyright (C) 2004 Greg Ungerer <gerg@snapgear.com>
+ */
+
+#include <asm/param.h>
+
+static inline void __delay(unsigned long loops)
+{
+#if defined(CONFIG_COLDFIRE)
+       /* The coldfire runs this loop at significantly different speeds
+        * depending upon long word alignment or not.  We'll pad it to
+        * long word alignment which is the faster version.
+        * The 0x4a8e is of course a 'tstl %fp' instruction.  This is better
+        * than using a NOP (0x4e71) instruction because it executes in one
+        * cycle not three and doesn't allow for an arbitary delay waiting
+        * for bus cycles to finish.  Also fp/a6 isn't likely to cause a
+        * stall waiting for the register to become valid if such is added
+        * to the coldfire at some stage.
+        */
+       __asm__ __volatile__ (  ".balignw 4, 0x4a8e\n\t"
+                               "1: subql #1, %0\n\t"
+                               "jcc 1b"
+               : "=d" (loops) : "0" (loops));
+#else
+       __asm__ __volatile__ (  "1: subql #1, %0\n\t"
+                               "jcc 1b"
+               : "=d" (loops) : "0" (loops));
+#endif
+}
+
+/*
+ *     Ideally we use a 32*32->64 multiply to calculate the number of
+ *     loop iterations, but the older standard 68k and ColdFire do not
+ *     have this instruction. So for them we have a clsoe approximation
+ *     loop using 32*32->32 multiplies only. This calculation based on
+ *     the ARM version of delay.
+ *
+ *     We want to implement:
+ *
+ *     loops = (usecs * 0x10c6 * HZ * loops_per_jiffy) / 2^32
+ */
+
+#define        HZSCALE         (268435456 / (1000000/HZ))
+
+extern unsigned long loops_per_jiffy;
+
+static inline void _udelay(unsigned long usecs)
+{
+#if defined(CONFIG_M68328) || defined(CONFIG_M68EZ328) || \
+    defined(CONFIG_M68VZ328) || defined(CONFIG_M68360) || \
+    defined(CONFIG_COLDFIRE)
+       __delay((((usecs * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6);
+#else
+       unsigned long tmp;
+
+       usecs *= 4295;          /* 2**32 / 1000000 */
+       __asm__ ("mulul %2,%0:%1"
+               : "=d" (usecs), "=d" (tmp)
+               : "d" (usecs), "1" (loops_per_jiffy*HZ));
+       __delay(usecs);
+#endif
+}
+
+/*
+ *     Moved the udelay() function into library code, no longer inlined.
+ *     I had to change the algorithm because we are overflowing now on
+ *     the faster ColdFire parts. The code is a little bigger, so it makes
+ *     sense to library it.
+ */
+extern void udelay(unsigned long usecs);
+
+#endif /* defined(_M68KNOMMU_DELAY_H) */