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authorPaul Mundt <lethal@linux-sh.org>2011-01-13 15:06:28 +0900
committerPaul Mundt <lethal@linux-sh.org>2011-01-13 15:06:28 +0900
commitf43dc23d5ea91fca257be02138a255f02d98e806 (patch)
treeb29722f6e965316e90ac97abf79923ced250dc21 /arch/arm/plat-versatile/sched-clock.c
parentf8e53553f452dcbf67cb89c8cba63a1cd6eb4cc0 (diff)
parent4162cf64973df51fc885825bc9ca4d055891c49f (diff)
downloadop-kernel-dev-f43dc23d5ea91fca257be02138a255f02d98e806.zip
op-kernel-dev-f43dc23d5ea91fca257be02138a255f02d98e806.tar.gz
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into common/serial-rework
Conflicts: arch/sh/kernel/cpu/sh2/setup-sh7619.c arch/sh/kernel/cpu/sh2a/setup-mxg.c arch/sh/kernel/cpu/sh2a/setup-sh7201.c arch/sh/kernel/cpu/sh2a/setup-sh7203.c arch/sh/kernel/cpu/sh2a/setup-sh7206.c arch/sh/kernel/cpu/sh3/setup-sh7705.c arch/sh/kernel/cpu/sh3/setup-sh770x.c arch/sh/kernel/cpu/sh3/setup-sh7710.c arch/sh/kernel/cpu/sh3/setup-sh7720.c arch/sh/kernel/cpu/sh4/setup-sh4-202.c arch/sh/kernel/cpu/sh4/setup-sh7750.c arch/sh/kernel/cpu/sh4/setup-sh7760.c arch/sh/kernel/cpu/sh4a/setup-sh7343.c arch/sh/kernel/cpu/sh4a/setup-sh7366.c arch/sh/kernel/cpu/sh4a/setup-sh7722.c arch/sh/kernel/cpu/sh4a/setup-sh7723.c arch/sh/kernel/cpu/sh4a/setup-sh7724.c arch/sh/kernel/cpu/sh4a/setup-sh7763.c arch/sh/kernel/cpu/sh4a/setup-sh7770.c arch/sh/kernel/cpu/sh4a/setup-sh7780.c arch/sh/kernel/cpu/sh4a/setup-sh7785.c arch/sh/kernel/cpu/sh4a/setup-sh7786.c arch/sh/kernel/cpu/sh4a/setup-shx3.c arch/sh/kernel/cpu/sh5/setup-sh5.c drivers/serial/sh-sci.c drivers/serial/sh-sci.h include/linux/serial_sci.h
Diffstat (limited to 'arch/arm/plat-versatile/sched-clock.c')
-rw-r--r--arch/arm/plat-versatile/sched-clock.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/arm/plat-versatile/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c
new file mode 100644
index 0000000..3d6a4c2
--- /dev/null
+++ b/arch/arm/plat-versatile/sched-clock.c
@@ -0,0 +1,58 @@
+/*
+ * linux/arch/arm/plat-versatile/sched-clock.c
+ *
+ * Copyright (C) 1999 - 2003 ARM Limited
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/io.h>
+#include <linux/sched.h>
+
+#include <asm/sched_clock.h>
+#include <plat/sched_clock.h>
+
+static DEFINE_CLOCK_DATA(cd);
+static void __iomem *ctr;
+
+/*
+ * Constants generated by clocks_calc_mult_shift(m, s, 24MHz, NSEC_PER_SEC, 60).
+ * This gives a resolution of about 41ns and a wrap period of about 178s.
+ */
+#define SC_MULT 2796202667u
+#define SC_SHIFT 26
+
+unsigned long long notrace sched_clock(void)
+{
+ if (ctr) {
+ u32 cyc = readl(ctr);
+ return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0,
+ SC_MULT, SC_SHIFT);
+ } else
+ return 0;
+}
+
+static void notrace versatile_update_sched_clock(void)
+{
+ u32 cyc = readl(ctr);
+ update_sched_clock(&cd, cyc, (u32)~0);
+}
+
+void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate)
+{
+ ctr = reg;
+ init_fixed_sched_clock(&cd, versatile_update_sched_clock,
+ 32, rate, SC_MULT, SC_SHIFT);
+}
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