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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/mips/kernel/i8253.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/mips/kernel/i8253.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c new file mode 100644 index 000000000..ca21210e0 --- /dev/null +++ b/arch/mips/kernel/i8253.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * i8253.c 8253/PIT functions + * + */ +#include <linux/clockchips.h> +#include <linux/i8253.h> +#include <linux/export.h> +#include <linux/smp.h> +#include <linux/irq.h> + +#include <asm/time.h> + +static irqreturn_t timer_interrupt(int irq, void *dev_id) +{ + i8253_clockevent.event_handler(&i8253_clockevent); + + return IRQ_HANDLED; +} + +void __init setup_pit_timer(void) +{ + unsigned long flags = IRQF_NOBALANCING | IRQF_TIMER; + + clockevent_i8253_init(true); + if (request_irq(0, timer_interrupt, flags, "timer", NULL)) + pr_err("Failed to request irq 0 (timer)\n"); +} + +static int __init init_pit_clocksource(void) +{ + if (num_possible_cpus() > 1 || /* PIT does not scale! */ + !clockevent_state_periodic(&i8253_clockevent)) + return 0; + + return clocksource_i8253_init(); +} +arch_initcall(init_pit_clocksource); |