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-rw-r--r--arch/loongarch/include/asm/time.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/time.h b/arch/loongarch/include/asm/time.h
new file mode 100644
index 000000000..2eae21930
--- /dev/null
+++ b/arch/loongarch/include/asm/time.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_TIME_H
+#define _ASM_TIME_H
+
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <asm/loongarch.h>
+
+extern u64 cpu_clock_freq;
+extern u64 const_clock_freq;
+
+extern void sync_counter(void);
+
+static inline unsigned int calc_const_freq(void)
+{
+ unsigned int res;
+ unsigned int base_freq;
+ unsigned int cfm, cfd;
+
+ res = read_cpucfg(LOONGARCH_CPUCFG2);
+ if (!(res & CPUCFG2_LLFTP))
+ return 0;
+
+ base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
+ res = read_cpucfg(LOONGARCH_CPUCFG5);
+ cfm = res & 0xffff;
+ cfd = (res >> 16) & 0xffff;
+
+ if (!base_freq || !cfm || !cfd)
+ return 0;
+
+ return (base_freq * cfm / cfd);
+}
+
+/*
+ * Initialize the calling CPU's timer interrupt as clockevent device
+ */
+extern int constant_clockevent_init(void);
+extern int constant_clocksource_init(void);
+
+static inline void clockevent_set_clock(struct clock_event_device *cd,
+ unsigned int clock)
+{
+ clockevents_calc_mult_shift(cd, clock, 4);
+}
+
+#endif /* _ASM_TIME_H */