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>

2 files changed, 15 insertions, 1 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 6b85145f8488..0e746449c29b 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 a006353a4310..14cb8d35924e 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);