diff options
| author | Yuval Adam <_@yuv.al> | 2017-08-30 08:25:59 +0000 |
|---|---|---|
| committer | Yuval Adam <_@yuv.al> | 2017-08-30 08:25:59 +0000 |
| commit | 8e4bff4cab0ddac6060645b0715210484d02ff40 (patch) | |
| tree | 3a5c3024371a04692a3a6d9974d001cdff8ebf84 /arch/mips/kernel/csrc-gic.c | |
Diffstat (limited to 'arch/mips/kernel/csrc-gic.c')
| -rw-r--r-- | arch/mips/kernel/csrc-gic.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/mips/kernel/csrc-gic.c b/arch/mips/kernel/csrc-gic.c new file mode 100644 index 00000000..e0262090 --- /dev/null +++ b/arch/mips/kernel/csrc-gic.c @@ -0,0 +1,40 @@ +/* + * 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/time.h> + +#include <asm/gic.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) +{ + unsigned int config, bits; + + /* Calculate the clocksource mask. */ + GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), config); + bits = 32 + ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >> + (GIC_SH_CONFIG_COUNTBITS_SHF - 2)); + + /* Set clocksource mask. */ + gic_clocksource.mask = CLOCKSOURCE_MASK(bits); + + /* Calculate a somewhat reasonable rating value. */ + gic_clocksource.rating = 200 + frequency / 10000000; + + clocksource_register_hz(&gic_clocksource, frequency); +} |