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| author |   Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
|---|---|---|
| committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
| commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
| tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/unicore32/lib/delay.S | |
| parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) | |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/unicore32/lib/delay.S')
| -rw-r--r-- | kernel/arch/unicore32/lib/delay.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/arch/unicore32/lib/delay.S b/kernel/arch/unicore32/lib/delay.S new file mode 100644 index 000000000..24664c009 --- /dev/null +++ b/kernel/arch/unicore32/lib/delay.S @@ -0,0 +1,51 @@ +/* + * linux/arch/unicore32/lib/delay.S + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * 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. + */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/param.h> + .text + +.LC0: .word loops_per_jiffy +.LC1: .word (2199023*HZ)>>11 + +/* + * r0 <= 2000 + * lpj <= 0x01ffffff (max. 3355 bogomips) + * HZ <= 1000 + */ + +ENTRY(__udelay) + ldw r2, .LC1 + mul r0, r2, r0 +ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06 + ldw r2, .LC0 + ldw r2, [r2] @ max = 0x01ffffff + mov r0, r0 >> #14 @ max = 0x0001ffff + mov r2, r2 >> #10 @ max = 0x00007fff + mul r0, r2, r0 @ max = 2^32-1 + mov.a r0, r0 >> #6 + cmoveq pc, lr + +/* + * loops = r0 * HZ * loops_per_jiffy / 1000000 + * + * Oh, if only we had a cycle counter... + */ + +@ Delay routine +ENTRY(__delay) + sub.a r0, r0, #2 + bua __delay + mov pc, lr +ENDPROC(__udelay) +ENDPROC(__const_udelay) +ENDPROC(__delay) |