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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-cris/arch-v10/timex.h
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-cris/arch-v10/timex.h')
-rw-r--r--include/asm-cris/arch-v10/timex.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v10/timex.h b/include/asm-cris/arch-v10/timex.h
new file mode 100644
index 00000000000..ecfc553c06a
--- /dev/null
+++ b/include/asm-cris/arch-v10/timex.h
@@ -0,0 +1,30 @@
+/*
+ * Use prescale timer at 25000 Hz instead of the baudrate timer at
+ * 19200 to get rid of the 64ppm to fast timer (and we get better
+ * resolution within a jiffie as well.
+ */
+#ifndef _ASM_CRIS_ARCH_TIMEX_H
+#define _ASM_CRIS_ARCH_TIMEX_H
+
+/* The prescaler clock runs at 25MHz, we divide it by 1000 in the prescaler */
+/* If you change anything here you must check time.c as well... */
+#define PRESCALE_FREQ 25000000
+#define PRESCALE_VALUE 1000
+#define CLOCK_TICK_RATE 25000 /* Underlying frequency of the HZ timer */
+/* The timer0 values gives 40us resolution (1/25000) but interrupts at HZ*/
+#define TIMER0_FREQ (CLOCK_TICK_RATE)
+#define TIMER0_CLKSEL flexible
+#define TIMER0_DIV (TIMER0_FREQ/(HZ))
+
+
+#define GET_JIFFIES_USEC() \
+ ( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV )
+
+unsigned long get_ns_in_jiffie(void);
+
+extern inline unsigned long get_us_in_jiffie_highres(void)
+{
+ return get_ns_in_jiffie()/1000;
+}
+
+#endif