armv7/exynos5250: Deprecate sdelay in favor of udelay

This gets rid of the clock-tick based sdelay in favor of udelay().
udelay() is more consistent and easier to work with, and this allows
us to carry one less variation of timers (and headers and sources...).

Every 1 unit in the sdelay() argument was assumed to cause a delay of
2 clock ticks (@1.7GHz). So the conversion factor is roughly:
sdelay(N) = udelay(((N * 2) / 1.7 * 10^9) * 10^6)
          = udelay((N * 2) / (1.7 * 10^3))

The sdelay() periods used were:
sdelay(100) --> udelay(1)
sdelay(0x10000) --> udelay(78) (rounded up to udelay(100))

There was one instance of sdelay(10000), which looked like sort of a
typo since sdelay(0x10000) was used elsewhere. sdelay(10000) should
approximate to about 12us, so we'll stick with that for now and leave
a note.

Change-Id: I5e7407865ceafa701eea1d613bbe50cf4734f33e
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/3079
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 0 insertions, 26 deletions

diff --git a/src/arch/armv7/include/system.h b/src/arch/armv7/include/system.h
deleted file mode 100644
index 0643852f76..0000000000
--- a/src/arch/armv7/include/system.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* FIXME(dhendrix): This is split out from asm/system.h. */
-#ifndef SYSTEM_H_
-#define SYSTEM_H_
-
-/*
- * This is used to ensure the compiler did actually allocate the register we
- * asked it for some inline assembly sequences.  Apparently we can't trust
- * the compiler from one version to another so a bit of paranoia won't hurt.
- * This string is meant to be concatenated with the inline asm string and
- * will cause compilation to stop on mismatch.
- * (for details, see gcc PR 15089)
- */
-#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
-
-#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
-
-#define arch_align_stack(x) (x)
-
-#ifndef __ASSEMBLER__
- /*
-  * FIXME: sdelay originally came from arch/arm/cpu/armv7/exynos5/setup.h in
-  * u-boot but does not seem specific to exynos5...
-  */
-void sdelay(unsigned long loops);
-#endif // __ASSEMBLY__
-#endif	/* SYSTEM_H_ */