Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/mips/kernel/csrc-bcm1480.c b/arch/mips/kernel/csrc-bcm1480.c
new file mode 100644
index 000000000..6c18a138f
--- /dev/null
+++ b/arch/mips/kernel/csrc-bcm1480.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2000,2001,2004 Broadcom Corporation
+ */
+#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/time.h>
+
+#include <asm/sibyte/bcm1480_regs.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/bcm1480_int.h>
+#include <asm/sibyte/bcm1480_scd.h>
+
+#include <asm/sibyte/sb1250.h>
+
+static u64 bcm1480_hpt_read(struct clocksource *cs)
+{
+        return (u64) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
+}
+
+struct clocksource bcm1480_clocksource = {
+        .name   = "zbbus-cycles",
+        .rating = 200,
+        .read   = bcm1480_hpt_read,
+        .mask   = CLOCKSOURCE_MASK(64),
+        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u64 notrace sb1480_read_sched_clock(void)
+{
+        return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
+}
+
+void __init sb1480_clocksource_init(void)
+{
+        struct clocksource *cs = &bcm1480_clocksource;
+        unsigned int plldiv;
+        unsigned long zbbus;
+
+        plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
+        zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
+        clocksource_register_hz(cs, zbbus);
+
+        sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
+}