diff options
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/kernel/csrc-ioasic.c | 65 |
2 files changed, 66 insertions, 0 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 87067e8fee9..00ac35e501b 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_CEVT_GT641XX) += cevt-gt641xx.o obj-$(CONFIG_CEVT_SB1250) += cevt-sb1250.o obj-$(CONFIG_CEVT_TXX9) += cevt-txx9.o obj-$(CONFIG_CSRC_BCM1480) += csrc-bcm1480.o +obj-$(CONFIG_CSRC_IOASIC) += csrc-ioasic.o obj-$(CONFIG_CSRC_R4K) += csrc-r4k.o obj-$(CONFIG_CSRC_SB1250) += csrc-sb1250.o obj-$(CONFIG_SYNC_R4K) += sync-r4k.o diff --git a/arch/mips/kernel/csrc-ioasic.c b/arch/mips/kernel/csrc-ioasic.c new file mode 100644 index 00000000000..1d5f63cf899 --- /dev/null +++ b/arch/mips/kernel/csrc-ioasic.c @@ -0,0 +1,65 @@ +/* + * DEC I/O ASIC's counter clocksource + * + * Copyright (C) 2008 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <linux/clocksource.h> +#include <linux/init.h> + +#include <asm/ds1287.h> +#include <asm/time.h> +#include <asm/dec/ioasic.h> +#include <asm/dec/ioasic_addrs.h> + +static cycle_t dec_ioasic_hpt_read(void) +{ + return ioasic_read(IO_REG_FCTR); +} + +static struct clocksource clocksource_dec = { + .name = "dec-ioasic", + .read = dec_ioasic_hpt_read, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +void __init dec_ioasic_clocksource_init(void) +{ + unsigned int freq; + u32 start, end; + int i = HZ / 10; + + + while (!ds1287_timer_state()) + ; + + start = dec_ioasic_hpt_read(); + + while (i--) + while (!ds1287_timer_state()) + ; + + end = dec_ioasic_hpt_read(); + + freq = (end - start) * 10; + printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq); + + clocksource_dec.rating = 200 + freq / 10000000; + clocksource_set_clock(&clocksource_dec, freq); + + clocksource_register(&clocksource_dec); +} |