1 files changed, 124 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..9f50766c4
--- /dev/null
+++ b/arch/powerpc/include/asm/time.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * 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.
+ */
+
+#ifndef __POWERPC_TIME_H
+#define __POWERPC_TIME_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/percpu.h>
+
+#include <asm/processor.h>
+#include <asm/cpu_has_feature.h>
+#include <asm/vdso/timebase.h>
+
+/* time.c */
+extern u64 decrementer_max;
+
+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;
+extern u64 decrementer_max;
+
+
+extern void generic_calibrate_decr(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
+
+extern bool tb_invalid;
+
+struct div_result {
+	u64 result_high;
+	u64 result_low;
+};
+
+static inline u64 get_vtb(void)
+{
+	if (cpu_has_feature(CPU_FTR_ARCH_207S))
+		return mfspr(SPRN_VTB);
+
+	return 0;
+}
+
+/* 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 u64 get_dec(void)
+{
+	if (IS_ENABLED(CONFIG_40x))
+		return mfspr(SPRN_PIT);
+
+	return mfspr(SPRN_DEC);
+}
+
+/*
+ * 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(u64 val)
+{
+	if (IS_ENABLED(CONFIG_40x))
+		mtspr(SPRN_PIT, (u32)val);
+	else if (IS_ENABLED(CONFIG_BOOKE))
+		mtspr(SPRN_DEC, val);
+	else
+		mtspr(SPRN_DEC, val - 1);
+}
+
+static inline unsigned long tb_ticks_since(unsigned long tstamp)
+{
+	return mftb() - 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);
+
+extern void secondary_cpu_time_init(void);
+extern void __init time_init(void);
+
+DECLARE_PER_CPU(u64, decrementers_next_tb);
+
+static inline u64 timer_get_next_tb(void)
+{
+	return __this_cpu_read(decrementers_next_tb);
+}
+
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+void timer_rearm_host_dec(u64 now);
+#endif
+
+/* Convert timebase ticks to nanoseconds */
+unsigned long long tb_to_ns(unsigned long long tb_ticks);
+
+void timer_broadcast_interrupt(void);
+
+/* SPLPAR and VIRT_CPU_ACCOUNTING_NATIVE */
+void pseries_accumulate_stolen_time(void);
+u64 pseries_calculate_stolen_time(u64 stop_tb);
+
+#endif /* __KERNEL__ */
+#endif /* __POWERPC_TIME_H */