[MIPS] add DECstation I/O ASIC clocksource
Add DECstation I/O ASIC clocksource Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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05a96fae43
Коммит
4247417d84
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@ -82,6 +82,7 @@ config MACH_DECSTATION
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bool "DECstations"
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select BOOT_ELF32
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select CEVT_R4K
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select CSRC_IOASIC
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select CSRC_R4K
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select CPU_DADDI_WORKAROUNDS if 64BIT
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select CPU_R4000_WORKAROUNDS if 64BIT
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@ -784,6 +785,9 @@ config CEVT_TXX9
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config CSRC_BCM1480
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bool
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config CSRC_IOASIC
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bool
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config CSRC_R4K
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bool
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@ -165,7 +165,7 @@ void __init plat_time_init(void)
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if (!cpu_has_counter && IOASIC)
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/* For pre-R4k systems we use the I/O ASIC's counter. */
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clocksource_mips.read = dec_ioasic_hpt_read;
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dec_ioasic_clocksource_init();
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/* Set up the rate of periodic DS1287 interrupts. */
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CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - __ffs(HZ)), RTC_REG_A);
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@ -14,6 +14,7 @@ obj-$(CONFIG_CEVT_GT641XX) += cevt-gt641xx.o
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obj-$(CONFIG_CEVT_SB1250) += cevt-sb1250.o
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obj-$(CONFIG_CEVT_TXX9) += cevt-txx9.o
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obj-$(CONFIG_CSRC_BCM1480) += csrc-bcm1480.o
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obj-$(CONFIG_CSRC_IOASIC) += csrc-ioasic.o
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obj-$(CONFIG_CSRC_R4K) += csrc-r4k.o
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obj-$(CONFIG_CSRC_SB1250) += csrc-sb1250.o
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obj-$(CONFIG_SYNC_R4K) += sync-r4k.o
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@ -0,0 +1,65 @@
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/*
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* DEC I/O ASIC's counter clocksource
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*
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* Copyright (C) 2008 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/clocksource.h>
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#include <linux/init.h>
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#include <asm/ds1287.h>
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#include <asm/time.h>
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#include <asm/dec/ioasic.h>
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#include <asm/dec/ioasic_addrs.h>
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static cycle_t dec_ioasic_hpt_read(void)
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{
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return ioasic_read(IO_REG_FCTR);
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}
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static struct clocksource clocksource_dec = {
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.name = "dec-ioasic",
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.read = dec_ioasic_hpt_read,
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.mask = CLOCKSOURCE_MASK(32),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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void __init dec_ioasic_clocksource_init(void)
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{
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unsigned int freq;
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u32 start, end;
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int i = HZ / 10;
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while (!ds1287_timer_state())
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;
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start = dec_ioasic_hpt_read();
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while (i--)
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while (!ds1287_timer_state())
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;
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end = dec_ioasic_hpt_read();
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freq = (end - start) * 10;
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printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
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clocksource_dec.rating = 200 + freq / 10000000;
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clocksource_set_clock(&clocksource_dec, freq);
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clocksource_register(&clocksource_dec);
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}
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@ -33,4 +33,6 @@ static inline u32 ioasic_read(unsigned int reg)
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extern void init_ioasic_irqs(int base);
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extern void dec_ioasic_clocksource_init(void);
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#endif /* __ASM_DEC_IOASIC_H */
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