From 2f6cf7bfc64c44d760d53caf4b547e7729392e78 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <michael.frysinger@analog.com>
Date: Sun, 21 Oct 2007 22:59:49 +0800
Subject: [PATCH] Blackfin arch: add functions for converting between sclks and
usecs
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
arch/blackfin/kernel/setup.c | 14 +++++++++++++-
include/asm-blackfin/bfin-global.h | 2 ++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 6b85145f84888..0e746449c29b1 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -459,7 +459,7 @@ static u_long get_vco(void)
return vco;
}
-/*Get the Core clock*/
+/* Get the Core clock */
u_long get_cclk(void)
{
u_long csel, ssel;
@@ -493,6 +493,18 @@ u_long get_sclk(void)
}
EXPORT_SYMBOL(get_sclk);
+unsigned long sclk_to_usecs(unsigned long sclk)
+{
+ return (USEC_PER_SEC * (u64)sclk) / get_sclk();
+}
+EXPORT_SYMBOL(sclk_to_usecs);
+
+unsigned long usecs_to_sclk(unsigned long usecs)
+{
+ return get_sclk() / (USEC_PER_SEC * (u64)usecs);
+}
+EXPORT_SYMBOL(usecs_to_sclk);
+
/*
* Get CPU information for use by the procfs.
*/
diff --git a/include/asm-blackfin/bfin-global.h b/include/asm-blackfin/bfin-global.h
index a006353a43105..14cb8d35924e7 100644
--- a/include/asm-blackfin/bfin-global.h
+++ b/include/asm-blackfin/bfin-global.h
@@ -47,6 +47,8 @@
extern unsigned long get_cclk(void);
extern unsigned long get_sclk(void);
+extern unsigned long sclk_to_usecs(unsigned long sclk);
+extern unsigned long usecs_to_sclk(unsigned long usecs);
extern void dump_thread(struct pt_regs *regs, struct user *dump);
extern void dump_bfin_regs(struct pt_regs *fp, void *retaddr);
--
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