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authorRalf Baechle <ralf@linux-mips.org>2010-08-05 13:25:50 +0100
committerRalf Baechle <ralf@linux-mips.org>2010-08-05 13:25:50 +0100
commit9ebc2935f346964c34e5f376263c4071f66edcd9 (patch)
treeaf2be831c66a5b23f5d184a87e9687f0bcafa9c0 /arch/mips/wrppmc/time.c
parent91598965ecb508dc7bc154ec9d3e35dcadb3fa5f (diff)
MIPS: WRPPMC: Move code one directory level up.
It was the last platform under gt64120 and will fit better into the new platform makefile scheme, if moved. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/wrppmc/time.c')
-rw-r--r--arch/mips/wrppmc/time.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/mips/wrppmc/time.c b/arch/mips/wrppmc/time.c
new file mode 100644
index 00000000000..668dbd5f12c
--- /dev/null
+++ b/arch/mips/wrppmc/time.c
@@ -0,0 +1,39 @@
+/*
+ * time.c: MIPS CPU Count/Compare timer hookup
+ *
+ * Author: Mark.Zhan, <rongkai.zhan@windriver.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 1997, 2004 by Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2006, Wind River System Inc.
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/gt64120.h>
+#include <asm/time.h>
+
+#define WRPPMC_CPU_CLK_FREQ 40000000 /* 40MHZ */
+
+/*
+ * Estimate CPU frequency. Sets mips_hpt_frequency as a side-effect
+ *
+ * NOTE: We disable all GT64120 timers, and use MIPS processor internal
+ * timer as the source of kernel clock tick.
+ */
+void __init plat_time_init(void)
+{
+ /* Disable GT64120 timers */
+ GT_WRITE(GT_TC_CONTROL_OFS, 0x00);
+ GT_WRITE(GT_TC0_OFS, 0x00);
+ GT_WRITE(GT_TC1_OFS, 0x00);
+ GT_WRITE(GT_TC2_OFS, 0x00);
+ GT_WRITE(GT_TC3_OFS, 0x00);
+
+ /* Use MIPS compare/count internal timer */
+ mips_hpt_frequency = WRPPMC_CPU_CLK_FREQ;
+}