summaryrefslogtreecommitdiff
path: root/arch/mips/wrppmc/time.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2010-08-12 21:38:56 +0200
committerIngo Molnar <mingo@elte.hu>2010-08-12 21:39:04 +0200
commitf46a6804135795f77d096ab0128f27531c7d051c (patch)
tree7cd33f69e3661327739ae4c96e5a8389e7fc912e /arch/mips/wrppmc/time.c
parentb3e84ffa21f916e3354a12a7f19169c9febe96d0 (diff)
parentad41a1e0cab07c5125456e8d38e5b1ab148d04aa (diff)
Merge branch 'linus' into perf/urgent
Merge reason: Fix upstream breakage introduced by: de5d9bf: Move list types from <linux/list.h> to <linux/types.h>. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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 000000000000..668dbd5f12c5
--- /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;
+}