powerpc: Merge time.c and asm/time.h.

We now use the merged time.c for both 32-bit and 64-bit compilation
with ARCH=powerpc, and for ARCH=ppc64, but not for ARCH=ppc32.
This removes setup_default_decr (folds its function into time_init)
and moves wakeup_decrementer into time.c.  This also makes an
asm-powerpc/rtc.h.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 212 insertions, 0 deletions

diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
new file mode 100644
index 0000000..4eecc38
--- /dev/null
+++ b/include/asm-powerpc/time.h
@@ -0,0 +1,212 @@
+/*
+ * 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/config.h>
+#include <linux/types.h>
+#include <linux/percpu.h>
+
+#include <asm/processor.h>
+#ifdef CONFIG_PPC64
+#include <asm/paca.h>
+#include <asm/iSeries/HvCall.h>
+#endif
+
+/* time.c */
+extern unsigned long tb_ticks_per_jiffy;
+extern unsigned long tb_ticks_per_usec;
+extern unsigned long tb_ticks_per_sec;
+extern u64 tb_to_xs;
+extern unsigned      tb_to_us;
+extern u64 tb_last_stamp;
+
+DECLARE_PER_CPU(unsigned long, last_jiffy);
+
+struct rtc_time;
+extern void to_tm(int tim, struct rtc_time * tm);
+extern time_t last_rtc_update;
+
+extern void generic_calibrate_decr(void);
+extern void wakeup_decrementer(void);
+
+/* 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
+
+/*
+ * By putting all of this stuff into a single struct we 
+ * reduce the number of cache lines touched by do_gettimeofday.
+ * Both by collecting all of the data in one cache line and
+ * by touching only one TOC entry on ppc64.
+ */
+struct gettimeofday_vars {
+	u64 tb_to_xs;
+	u64 stamp_xsec;
+	u64 tb_orig_stamp;
+};
+
+struct gettimeofday_struct {
+	unsigned long tb_ticks_per_sec;
+	struct gettimeofday_vars vars[2];
+	struct gettimeofday_vars * volatile varp;
+	unsigned      var_idx;
+	unsigned      tb_to_us;
+};
+
+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
+
+/* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */
+static 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;
+}
+
+static inline unsigned int get_tbu(void)
+{
+	unsigned int tbu;
+
+#if defined(CONFIG_403GCX)
+	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
+#else
+	asm volatile("mftbu %0" : "=r" (tbu));
+#endif
+	return tbu;
+}
+
+static inline unsigned int get_rtcl(void)
+{
+	unsigned int rtcl;
+
+	asm volatile("mfrtcl %0" : "=r" (rtcl));
+	return rtcl;
+}
+
+#ifdef CONFIG_PPC64
+static inline u64 get_tb(void)
+{
+	return mftb();
+}
+#else
+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
+
+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
+}
+
+static inline void set_dec(int val)
+{
+#if defined(CONFIG_40x)
+	return;		/* Have to let it auto-reload */
+#elif defined(CONFIG_8xx_CPU6)
+	set_dec_cpu6(val);
+#else
+#ifdef CONFIG_PPC_ISERIES
+	struct paca_struct *lpaca = get_paca();
+	int cur_dec;
+
+	if (lpaca->lppaca.shared_proc) {
+		lpaca->lppaca.virtual_decr = val;
+		cur_dec = get_dec();
+		if (cur_dec > val)
+			HvCall_setVirtualDecr();
+	} else
+#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
+
+unsigned mulhwu_scale_factor(unsigned, unsigned);
+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);
+
+#endif /* __KERNEL__ */
+#endif /* __PPC64_TIME_H */