Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2015 Numascale AS. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/clockchips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/numachip/numachip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/numachip/numachip_csr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static DEFINE_PER_CPU(struct clock_event_device, numachip2_ced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static cycles_t numachip2_timer_read(struct clocksource *cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	return numachip2_read64_lcsr(NUMACHIP2_TIMER_NOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct clocksource numachip2_clocksource = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	.name            = "numachip2",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	.rating          = 295,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	.read            = numachip2_timer_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	.mask            = CLOCKSOURCE_MASK(64),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	.flags           = CLOCK_SOURCE_IS_CONTINUOUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	.mult            = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	.shift           = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int numachip2_set_next_event(unsigned long delta, struct clock_event_device *ced)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	numachip2_write64_lcsr(NUMACHIP2_TIMER_DEADLINE + numachip2_timer(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static const struct clock_event_device numachip2_clockevent __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	.name            = "numachip2",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	.rating          = 400,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	.set_next_event  = numachip2_set_next_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	.features        = CLOCK_EVT_FEAT_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	.mult            = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	.shift           = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	.min_delta_ns    = 1250,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	.min_delta_ticks = 1250,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	.max_delta_ns    = LONG_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	.max_delta_ticks = LONG_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static void numachip_timer_interrupt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	ced->event_handler(ced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static __init void numachip_timer_each(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	unsigned local_apicid = __this_cpu_read(x86_cpu_to_apicid) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	/* Setup IPI vector to local core and relative timing mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	numachip2_write64_lcsr(NUMACHIP2_TIMER_INT + numachip2_timer(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		(3 << 22) | (X86_PLATFORM_IPI_VECTOR << 14) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		(local_apicid << 6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	*ced = numachip2_clockevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	ced->cpumask = cpumask_of(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	clockevents_register_device(ced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int __init numachip_timer_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	if (numachip_system != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	/* Reset timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	numachip2_write64_lcsr(NUMACHIP2_TIMER_RESET, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	clocksource_register_hz(&numachip2_clocksource, NSEC_PER_SEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	/* Setup per-cpu clockevents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	x86_platform_ipi_callback = numachip_timer_interrupt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	schedule_on_each_cpu(&numachip_timer_each);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) arch_initcall(numachip_timer_init);