diff options
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/clocksource/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clocksource/mips-gic-timer.c | 32 |
3 files changed, 37 insertions, 0 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 90420600e1eb..cb7e7f417a60 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -223,4 +223,8 @@ config CLKSRC_VERSATILE ARM Versatile, RealView and Versatile Express reference platforms. +config CLKSRC_MIPS_GIC + bool + depends on MIPS_GIC + endmenu diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 756f6f10efa0..e23fc2d5fc27 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -46,3 +46,4 @@ obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o obj-$(CONFIG_ARCH_HAS_TICK_BROADCAST) += dummy_timer.o obj-$(CONFIG_ARCH_KEYSTONE) += timer-keystone.o obj-$(CONFIG_CLKSRC_VERSATILE) += versatile.o +obj-$(CONFIG_CLKSRC_MIPS_GIC) += mips-gic-timer.o diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c new file mode 100644 index 000000000000..0bf28e6aca7a --- /dev/null +++ b/drivers/clocksource/mips-gic-timer.c @@ -0,0 +1,32 @@ +/* + * 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) 2012 MIPS Technologies, Inc. All rights reserved. + */ +#include <linux/init.h> +#include <linux/irqchip/mips-gic.h> +#include <linux/time.h> + +static cycle_t gic_hpt_read(struct clocksource *cs) +{ + return gic_read_count(); +} + +static struct clocksource gic_clocksource = { + .name = "GIC", + .read = gic_hpt_read, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +void __init gic_clocksource_init(unsigned int frequency) +{ + /* Set clocksource mask. */ + gic_clocksource.mask = CLOCKSOURCE_MASK(gic_get_count_width()); + + /* Calculate a somewhat reasonable rating value. */ + gic_clocksource.rating = 200 + frequency / 10000000; + + clocksource_register_hz(&gic_clocksource, frequency); +} |