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authorMark Rutland <mark.rutland@arm.com>2012-11-12 14:33:44 +0000
committerMark Rutland <mark.rutland@arm.com>2013-01-31 15:51:49 +0000
commit8a4da6e36c582ff746191eca85b6c1c068dbfbd6 (patch)
tree9c4be7e6853d33f35580e6f7c64c3d410dfe4aaf /include/clocksource
parentb2deabe3ba664a1ec47400c0ca285e951874e0cc (diff)
arm: arch_timer: move core to drivers/clocksource
The core functionality of the arch_timer driver is not directly tied to anything under arch/arm, and can be split out. This patch factors out the core of the arch_timer driver, so it can be shared with other architectures. A couple of functions are added so that architecture-specific code can interact with the driver without needing to touch its internals. The ARM_ARCH_TIMER config variable is moved out to drivers/clocksource/Kconfig, existing uses in arch/arm are replaced with HAVE_ARM_ARCH_TIMER, which selects it. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include/clocksource')
-rw-r--r--include/clocksource/arm_arch_timer.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
new file mode 100644
index 000000000000..b61f9961b0cc
--- /dev/null
+++ b/include/clocksource/arm_arch_timer.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
+#define __CLKSOURCE_ARM_ARCH_TIMER_H
+
+#include <linux/clocksource.h>
+#include <linux/types.h>
+
+#define ARCH_TIMER_CTRL_ENABLE (1 << 0)
+#define ARCH_TIMER_CTRL_IT_MASK (1 << 1)
+#define ARCH_TIMER_CTRL_IT_STAT (1 << 2)
+
+#define ARCH_TIMER_REG_CTRL 0
+#define ARCH_TIMER_REG_TVAL 1
+
+#define ARCH_TIMER_PHYS_ACCESS 0
+#define ARCH_TIMER_VIRT_ACCESS 1
+
+#ifdef CONFIG_ARM_ARCH_TIMER
+
+extern int arch_timer_init(void);
+extern u32 arch_timer_get_rate(void);
+extern u64 (*arch_timer_read_counter)(void);
+extern struct timecounter *arch_timer_get_timecounter(void);
+
+#else
+
+static inline int arch_timer_init(void)
+{
+ return -ENXIO;
+}
+
+static inline u32 arch_timer_get_rate(void)
+{
+ return 0;
+}
+
+static inline u64 arch_timer_read_counter(void)
+{
+ return 0;
+}
+
+static struct timecounter *arch_timer_get_timecounter(void)
+{
+ return NULL;
+}
+
+#endif
+
+#endif

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