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>
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 6b85145..0e74644 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -459,7 +459,7 @@
return vco;
}
-/*Get the Core clock*/
+/* Get the Core clock */
u_long get_cclk(void)
{
u_long csel, ssel;
@@ -493,6 +493,18 @@
}
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 a006353..14cb8d3 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);