Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / jz4740 / timer.c

diff --git a/kernel/arch/mips/jz4740/timer.c b/kernel/arch/mips/jz4740/timer.c
new file mode 100644 (file)
index 0000000..4992461
--- /dev/null
+++ b/kernel/arch/mips/jz4740/timer.c
@@ -0,0 +1,50 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *  JZ4740 platform timer support
+ *
+ *  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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/mach-jz4740/base.h>
+#include <asm/mach-jz4740/timer.h>
+
+void __iomem *jz4740_timer_base;
+EXPORT_SYMBOL_GPL(jz4740_timer_base);
+
+void jz4740_timer_enable_watchdog(void)
+{
+       writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
+}
+EXPORT_SYMBOL_GPL(jz4740_timer_enable_watchdog);
+
+void jz4740_timer_disable_watchdog(void)
+{
+       writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
+}
+EXPORT_SYMBOL_GPL(jz4740_timer_disable_watchdog);
+
+void __init jz4740_timer_init(void)
+{
+       jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100);
+
+       if (!jz4740_timer_base)
+               panic("Failed to ioremap timer registers");
+
+       /* Disable all timer clocks except for those used as system timers */
+       writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
+
+       /* Timer irqs are unmasked by default, mask them */
+       writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
+}