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

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c
new file mode 100644
index 000000000..1b6fa6649
--- /dev/null
+++ b/arch/mips/cobalt/time.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Cobalt time initialization.
+ *
+ *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+#include <linux/i8253.h>
+#include <linux/init.h>
+
+#include <asm/gt64120.h>
+#include <asm/time.h>
+
+#define GT641XX_BASE_CLOCK      50000000        /* 50MHz */
+
+void __init plat_time_init(void)
+{
+        u32 start, end;
+        int i = HZ / 10;
+
+        setup_pit_timer();
+
+        gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
+
+        /*
+         * MIPS counter frequency is measured during a 100msec interval
+         * using GT64111 timer0.
+         */
+        while (!gt641xx_timer0_state())
+                ;
+
+        start = read_c0_count();
+
+        while (i--)
+                while (!gt641xx_timer0_state())
+                        ;
+
+        end = read_c0_count();
+
+        mips_hpt_frequency = (end - start) * 10;
+        printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency);
+}