1 // SPDX-License-Identifier: GPL-2.0-only
29 #include <linux/arm-smccc.h>
47 	[ARCH_TIMER_PHYS_SECURE_PPI]	= "sec-phys",
50 	[ARCH_TIMER_HYP_PPI]		= "hyp-phys",
51 	[ARCH_TIMER_HYP_VIRT_PPI]	= "hyp-virt",
78  *   2) a roll-over time of not less than 40 years
87 	return clamp_val(ilog2(min_cycles - 1) + 1, 56, 64);  in arch_counter_get_width()
180 		_retries--;				\
216 		_retries--;					\
217 	} while (unlikely((_new - _old) >> 5) && _retries);	\
250 		.oem_table_id	= "HIP07   ",
281  * (7ff -> 000 -> 800) and forward (7ff -> fff -> 800), ignore register values
291 		_retries--;						\
359 		.id = "fsl,erratum-a008585",
370 		.id = "hisilicon,erratum-161010101",
401 		.id = "allwinner,erratum-unknown1",
428 	return of_property_read_bool(np, wa->id);  in arch_timer_check_dt_erratum()
435 	return this_cpu_has_cap((uintptr_t)wa->id);  in arch_timer_check_local_cap_erratum()
444 	const struct ate_acpi_oem_info *info = wa->id;  in arch_timer_check_acpi_oem_erratum()
449 		if (!memcmp(info->oem_id, table->oem_id, ACPI_OEM_ID_SIZE) &&  in arch_timer_check_acpi_oem_erratum()
450 		    !memcmp(info->oem_table_id, table->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&  in arch_timer_check_acpi_oem_erratum()
451 		    info->oem_revision == table->oem_revision)  in arch_timer_check_acpi_oem_erratum()
491 	if (wa->read_cntvct_el0 || wa->read_cntpct_el0)  in arch_timer_enable_workaround()
496 	 * out-of-line counter accessor. We may change our mind pretty  in arch_timer_enable_workaround()
497 	 * late in the game (with a per-CPU erratum, for example), so  in arch_timer_enable_workaround()
500 	if (wa->read_cntvct_el0) {  in arch_timer_enable_workaround()
503 	} else if (wa->disable_compat_vdso && vdso_default != VDSO_CLOCKMODE_NONE) {  in arch_timer_enable_workaround()
539 			wa->desc, __wa->desc);  in arch_timer_check_ool_workaround()
546 		local ? "local" : "global", wa->desc);  in arch_timer_check_ool_workaround()
573 		evt->event_handler(evt);  in timer_handler()
654 		 * XGene-1 implements CVAL in terms of TVAL, meaning  in __arch_timer_check_delta()
676 	typeof(clk->set_next_event) sne;  in __arch_timer_setup()
679 	clk->features = CLOCK_EVT_FEAT_ONESHOT;  in __arch_timer_setup()
684 		clk->features |= CLOCK_EVT_FEAT_C3STOP;  in __arch_timer_setup()
685 	clk->name = "arch_sys_timer";  in __arch_timer_setup()
686 	clk->rating = 450;  in __arch_timer_setup()
687 	clk->cpumask = cpumask_of(smp_processor_id());  in __arch_timer_setup()
688 	clk->irq = arch_timer_ppi[arch_timer_uses_ppi];  in __arch_timer_setup()
691 		clk->set_state_shutdown = arch_timer_shutdown_virt;  in __arch_timer_setup()
692 		clk->set_state_oneshot_stopped = arch_timer_shutdown_virt;  in __arch_timer_setup()
698 		clk->set_state_shutdown = arch_timer_shutdown_phys;  in __arch_timer_setup()
699 		clk->set_state_oneshot_stopped = arch_timer_shutdown_phys;  in __arch_timer_setup()
706 	clk->set_next_event = sne;  in __arch_timer_setup()
709 	clk->set_state_shutdown(clk);  in __arch_timer_setup()
722 		divider -= 8;  in arch_timer_evtstrm_enable()
750 	lsb = fls(evt_stream_div) - 1;  in arch_timer_configure_evtstream()
751 	if (lsb > 0 && (evt_stream_div & BIT(lsb - 1)))  in arch_timer_configure_evtstream()
850 		return -EINVAL;  in validate_timer_rate()
859  * For historical reasons, when probing with DT we use whichever (non-zero)
861  * probed has a clock-frequency property, this overrides the HW register.
869 	if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate))  in arch_timer_of_configure_rate()
954 	pr_debug("disable IRQ%d cpu #%d\n", clk->irq, smp_processor_id());  in arch_timer_stop()
1019 		err = -ENOMEM;  in arch_timer_register()
1091  * arch_timer_select_ppi() - Select suitable PPI for the current system.
1140 	has_names = of_property_present(np, "interrupt-names");  in arch_timer_of_init()
1156 	arch_timer_c3stop = !of_property_read_bool(np, "always-on");  in arch_timer_of_init()
1166 	    of_property_read_bool(np, "arm,cpu-registers-not-fw-configured"))  in arch_timer_of_init()
1173 		return -EINVAL;  in arch_timer_of_init()
1178 							 "arm,no-tick-in-suspend");  in arch_timer_of_init()
1186 TIMER_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init);
1187 TIMER_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init);
1196 		return -EINVAL;  in arch_timer_acpi_init()
1228 		return -EINVAL;  in arch_timer_acpi_init()
1231 	/* Always-on capability */  in arch_timer_acpi_init()
1254 		return -EOPNOTSUPP;  in kvm_arch_ptp_get_crosststamp()
1265 		return -EOPNOTSUPP;  in kvm_arch_ptp_get_crosststamp()