From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/mips/kernel/csrc-ioasic.c | 65 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 arch/mips/kernel/csrc-ioasic.c (limited to 'arch/mips/kernel/csrc-ioasic.c') diff --git a/arch/mips/kernel/csrc-ioasic.c b/arch/mips/kernel/csrc-ioasic.c new file mode 100644 index 0000000000..bad740ad32 --- /dev/null +++ b/arch/mips/kernel/csrc-ioasic.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * DEC I/O ASIC's counter clocksource + * + * Copyright (C) 2008 Yoichi Yuasa + */ +#include +#include +#include + +#include +#include +#include +#include + +static u64 dec_ioasic_hpt_read(struct clocksource *cs) +{ + 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, +}; + +static u64 notrace dec_ioasic_read_sched_clock(void) +{ + return ioasic_read(IO_REG_FCTR); +} + +int __init dec_ioasic_clocksource_init(void) +{ + unsigned int freq; + u32 start, end; + int i = HZ / 8; + + ds1287_timer_state(); + while (!ds1287_timer_state()) + ; + + start = dec_ioasic_hpt_read(&clocksource_dec); + + while (i--) + while (!ds1287_timer_state()) + ; + + end = dec_ioasic_hpt_read(&clocksource_dec); + + freq = (end - start) * 8; + + /* An early revision of the I/O ASIC didn't have the counter. */ + if (!freq) + return -ENXIO; + + printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq); + + clocksource_dec.rating = 200 + freq / 10000000; + clocksource_register_hz(&clocksource_dec, freq); + + sched_clock_register(dec_ioasic_read_sched_clock, 32, freq); + + return 0; +} -- cgit v1.2.3