Initial import

1 files changed, 218 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
new file mode 100644
index 000000000..10fc784a2
--- /dev/null
+++ b/arch/powerpc/include/asm/time.h
@@ -0,0 +1,218 @@
+/*
+ * Common time prototypes and such for all ppc machines.
+ *
+ * Written by Cort Dougan (cort@cs.nmt.edu) to merge
+ * Paul Mackerras' version and mine for PReP and Pmac.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __POWERPC_TIME_H
+#define __POWERPC_TIME_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/percpu.h>
+
+#include <asm/processor.h>
+
+/* time.c */
+extern unsigned long tb_ticks_per_jiffy;
+extern unsigned long tb_ticks_per_usec;
+extern unsigned long tb_ticks_per_sec;
+extern struct clock_event_device decrementer_clockevent;
+
+struct rtc_time;
+extern void to_tm(int tim, struct rtc_time * tm);
+extern void GregorianDay(struct rtc_time *tm);
+extern void tick_broadcast_ipi_handler(void);
+
+extern void generic_calibrate_decr(void);
+
+extern void set_dec_cpu6(unsigned int val);
+
+/* Some sane defaults: 125 MHz timebase, 1GHz processor */
+extern unsigned long ppc_proc_freq;
+#define DEFAULT_PROC_FREQ	(DEFAULT_TB_FREQ * 8)
+extern unsigned long ppc_tb_freq;
+#define DEFAULT_TB_FREQ		125000000UL
+
+struct div_result {
+	u64 result_high;
+	u64 result_low;
+};
+
+/* 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
+#define __USE_RTC()	(!cpu_has_feature(CPU_FTR_USE_TB))
+#else
+#define __USE_RTC()	0
+#endif
+
+#ifdef CONFIG_PPC64
+
+/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
+#define get_tbl		get_tb
+
+#else
+
+static inline unsigned long get_tbl(void)
+{
+#if defined(CONFIG_403GCX)
+	unsigned long tbl;
+	asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
+	return tbl;
+#else
+	return mftbl();
+#endif
+}
+
+static inline unsigned int get_tbu(void)
+{
+#ifdef CONFIG_403GCX
+	unsigned int tbu;
+	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
+	return tbu;
+#else
+	return mftbu();
+#endif
+}
+#endif /* !CONFIG_PPC64 */
+
+static inline unsigned int get_rtcl(void)
+{
+	unsigned int rtcl;
+
+	asm volatile("mfrtcl %0" : "=r" (rtcl));
+	return rtcl;
+}
+
+static inline u64 get_rtc(void)
+{
+	unsigned int hi, lo, hi2;
+
+	do {
+		asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
+			     : "=r" (hi), "=r" (lo), "=r" (hi2));
+	} while (hi2 != hi);
+	return (u64)hi * 1000000000 + lo;
+}
+
+static inline u64 get_vtb(void)
+{
+#ifdef CONFIG_PPC_BOOK3S_64
+	if (cpu_has_feature(CPU_FTR_ARCH_207S))
+		return mfvtb();
+#endif
+	return 0;
+}
+
+#ifdef CONFIG_PPC64
+static inline u64 get_tb(void)
+{
+	return mftb();
+}
+#else /* CONFIG_PPC64 */
+static inline u64 get_tb(void)
+{
+	unsigned int tbhi, tblo, tbhi2;
+
+	do {
+		tbhi = get_tbu();
+		tblo = get_tbl();
+		tbhi2 = get_tbu();
+	} while (tbhi != tbhi2);
+
+	return ((u64)tbhi << 32) | tblo;
+}
+#endif /* !CONFIG_PPC64 */
+
+static inline u64 get_tb_or_rtc(void)
+{
+	return __USE_RTC() ? get_rtc() : get_tb();
+}
+
+static inline void set_tb(unsigned int upper, unsigned int lower)
+{
+	mtspr(SPRN_TBWL, 0);
+	mtspr(SPRN_TBWU, upper);
+	mtspr(SPRN_TBWL, lower);
+}
+
+/* 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
+}
+
+/*
+ * Note: Book E and 4xx processors differ from other PowerPC processors
+ * in when the decrementer generates its interrupt: on the 1 to 0
+ * transition for Book E/4xx, but on the 0 to -1 transition for others.
+ */
+static inline void set_dec(int val)
+{
+#if defined(CONFIG_40x)
+	mtspr(SPRN_PIT, val);
+#elif defined(CONFIG_8xx_CPU6)
+	set_dec_cpu6(val - 1);
+#else
+#ifndef CONFIG_BOOKE
+	--val;
+#endif
+	mtspr(SPRN_DEC, val);
+#endif /* not 40x or 8xx_CPU6 */
+}
+
+static inline unsigned long tb_ticks_since(unsigned long tstamp)
+{
+	if (__USE_RTC()) {
+		int delta = get_rtcl() - (unsigned int) tstamp;
+		return delta < 0 ? delta + 1000000000 : delta;
+	}
+	return get_tbl() - tstamp;
+}
+
+#define mulhwu(x,y) \
+({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
+
+#ifdef CONFIG_PPC64
+#define mulhdu(x,y) \
+({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
+#else
+extern u64 mulhdu(u64, u64);
+#endif
+
+extern void div128_by_32(u64 dividend_high, u64 dividend_low,
+			 unsigned divisor, struct div_result *dr);
+
+/* Used to store Processor Utilization register (purr) values */
+
+struct cpu_usage {
+        u64 current_tb;  /* Holds the current purr register values */
+};
+
+DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
+
+extern void secondary_cpu_time_init(void);
+
+DECLARE_PER_CPU(u64, decrementers_next_tb);
+
+/* Convert timebase ticks to nanoseconds */
+unsigned long long tb_to_ns(unsigned long long tb_ticks);
+
+#endif /* __KERNEL__ */
+#endif /* __POWERPC_TIME_H */