1 files changed, 157 insertions, 0 deletions

diff --git a/include/asm-ppc/time.h b/include/asm-ppc/time.h
new file mode 100644
index 000000000000..ce09b47fa819
--- /dev/null
+++ b/include/asm-ppc/time.h
@@ -0,0 +1,157 @@
+/*
+ * Common time prototypes and such for all ppc machines.
+ *
+ * Written by Cort Dougan (cort@fsmlabs.com) to merge
+ * Paul Mackerras' version and mine for PReP and Pmac.
+ */
+
+#ifdef __KERNEL__
+#ifndef __ASM_TIME_H__
+#define __ASM_TIME_H__
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/rtc.h>
+#include <linux/threads.h>
+
+#include <asm/reg.h>
+
+/* time.c */
+extern unsigned tb_ticks_per_jiffy;
+extern unsigned tb_to_us;
+extern unsigned tb_last_stamp;
+extern unsigned long disarm_decr[NR_CPUS];
+
+extern void to_tm(int tim, struct rtc_time * tm);
+extern time_t last_rtc_update;
+
+extern void set_dec_cpu6(unsigned int val);
+
+int via_calibrate_decr(void);
+
+/* Accessor functions for the decrementer register.
+ * The 4xx doesn't even have a decrementer.  I tried to use the
+ * generic timer interrupt code, which seems OK, with the 4xx PIT
+ * in auto-reload mode.  The problem is PIT stops counting when it
+ * hits zero.  If it would wrap, we could use it just like a decrementer.
+ */
+static __inline__ unsigned int get_dec(void)
+{
+#if defined(CONFIG_40x)
+        return (mfspr(SPRN_PIT));
+#else
+        return (mfspr(SPRN_DEC));
+#endif
+}
+
+static __inline__ void set_dec(unsigned int val)
+{
+#if defined(CONFIG_40x)
+        return;         /* Have to let it auto-reload */
+#elif defined(CONFIG_8xx_CPU6)
+        set_dec_cpu6(val);
+#else
+        mtspr(SPRN_DEC, val);
+#endif
+}
+
+/* Accessor functions for the timebase (RTC on 601) registers. */
+/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
+#ifdef CONFIG_6xx
+extern __inline__ int const __USE_RTC(void) {
+        return (mfspr(SPRN_PVR)>>16) == 1;
+}
+#else
+#define __USE_RTC() 0
+#endif
+
+extern __inline__ unsigned long get_tbl(void) {
+        unsigned long tbl;
+#if defined(CONFIG_403GCX)
+        asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
+#else
+        asm volatile("mftb %0" : "=r" (tbl));
+#endif
+        return tbl;
+}
+
+extern __inline__ unsigned long get_tbu(void) {
+        unsigned long tbl;
+#if defined(CONFIG_403GCX)
+        asm volatile("mfspr %0, 0x3dc" : "=r" (tbl));
+#else
+        asm volatile("mftbu %0" : "=r" (tbl));
+#endif
+        return tbl;
+}
+
+extern __inline__ void set_tb(unsigned int upper, unsigned int lower)
+{
+        mtspr(SPRN_TBWL, 0);
+        mtspr(SPRN_TBWU, upper);
+        mtspr(SPRN_TBWL, lower);
+}
+
+extern __inline__ unsigned long get_rtcl(void) {
+        unsigned long rtcl;
+        asm volatile("mfrtcl %0" : "=r" (rtcl));
+        return rtcl;
+}
+
+extern __inline__ unsigned long get_rtcu(void)
+{
+        unsigned long rtcu;
+        asm volatile("mfrtcu %0" : "=r" (rtcu));
+        return rtcu;
+}
+
+extern __inline__ unsigned get_native_tbl(void) {
+        if (__USE_RTC())
+                return get_rtcl();
+        else
+                return get_tbl();
+}
+
+/* On machines with RTC, this function can only be used safely
+ * after the timestamp and for 1 second. It is only used by gettimeofday
+ * however so it should not matter.
+ */
+extern __inline__ unsigned tb_ticks_since(unsigned tstamp) {
+        if (__USE_RTC()) {
+                int delta = get_rtcl() - tstamp;
+                return delta<0 ? delta + 1000000000 : delta;
+        } else {
+                return get_tbl() - tstamp;
+        }
+}
+
+#if 0
+extern __inline__ unsigned long get_bin_rtcl(void) {
+      unsigned long rtcl, rtcu1, rtcu2;
+      asm volatile("\
+1:    mfrtcu  %0\n\
+      mfrtcl  %1\n\
+      mfrtcu  %2\n\
+      cmpw    %0,%2\n\
+      bne-    1b\n"
+      : "=r" (rtcu1), "=r" (rtcl), "=r" (rtcu2)
+      : : "cr0");
+      return rtcu2*1000000000+rtcl;
+}
+
+extern __inline__ unsigned binary_tbl(void) {
+      if (__USE_RTC())
+              return get_bin_rtcl();
+      else
+              return get_tbl();
+}
+#endif
+
+/* Use mulhwu to scale processor timebase to timeval */
+/* Specifically, this computes (x * y) / 2^32.  -- paulus */
+#define mulhwu(x,y) \
+({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
+
+unsigned mulhwu_scale_factor(unsigned, unsigned);
+#endif /* __ASM_TIME_H__ */
+#endif /* __KERNEL__ */