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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/mips/sgi-ip30/ip30-timer.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/sgi-ip30/ip30-timer.c')
-rw-r--r-- | arch/mips/sgi-ip30/ip30-timer.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip30/ip30-timer.c b/arch/mips/sgi-ip30/ip30-timer.c new file mode 100644 index 0000000000..d13e105478 --- /dev/null +++ b/arch/mips/sgi-ip30/ip30-timer.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ip30-timer.c: Clocksource/clockevent support for the + * HEART chip in SGI Octane (IP30) systems. + * + * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org> + * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de> + * Copyright (C) 2011 Joshua Kinard <kumba@gentoo.org> + */ + +#include <linux/clocksource.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/percpu.h> +#include <linux/sched_clock.h> + +#include <asm/time.h> +#include <asm/cevt-r4k.h> +#include <asm/sgi/heart.h> + +static u64 ip30_heart_counter_read(struct clocksource *cs) +{ + return heart_read(&heart_regs->count); +} + +struct clocksource ip30_heart_clocksource = { + .name = "HEART", + .rating = 400, + .read = ip30_heart_counter_read, + .mask = CLOCKSOURCE_MASK(52), + .flags = (CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_VALID_FOR_HRES), +}; + +static u64 notrace ip30_heart_read_sched_clock(void) +{ + return heart_read(&heart_regs->count); +} + +static void __init ip30_heart_clocksource_init(void) +{ + struct clocksource *cs = &ip30_heart_clocksource; + + clocksource_register_hz(cs, HEART_CYCLES_PER_SEC); + + sched_clock_register(ip30_heart_read_sched_clock, 52, + HEART_CYCLES_PER_SEC); +} + +void __init plat_time_init(void) +{ + int irq = get_c0_compare_int(); + + cp0_timer_irq_installed = 1; + c0_compare_irqaction.percpu_dev_id = &mips_clockevent_device; + c0_compare_irqaction.flags &= ~IRQF_SHARED; + irq_set_handler(irq, handle_percpu_devid_irq); + irq_set_percpu_devid(irq); + setup_percpu_irq(irq, &c0_compare_irqaction); + enable_percpu_irq(irq, IRQ_TYPE_NONE); + + ip30_heart_clocksource_init(); +} |