1 // SPDX-License-Identifier: GPL-2.0-only
3  * apb_timer.c: Driver for Langwell APB timers
17  *  - timer 0 - NR_CPUs for per cpu timer
18  *  - one timer for clocksource
19  *  - one timer for watchdog driver.
20  * It is also worth notice that APB timer does not support true one-shot mode,
21  * free-running mode will be used here to emulate one-shot mode.
22  * APB timer can also be used as broadcast timer along with per cpu local APIC
23  * timer, but by default APB timer has higher rating than local APIC timers.
39 #include <asm/intel-mid.h>
53  * Common DW APB timer info
69 	return apbt_virt_address + adev->num * APBTMRS_REG_SIZE;  in adev_virt_addr()
84 		pr_debug("APBT base already mapped\n");  in apbt_set_mapping()
93 	apbt_address = (phys_addr_t)mtmr->phys_addr;  in apbt_set_mapping()
95 		printk(KERN_WARNING "No timer base from SFI, use default\n");  in apbt_set_mapping()
104 	apbt_freq = mtmr->freq_hz;  in apbt_set_mapping()
114 		 (int)(mtmr->phys_addr & 0xff) / APBTMRS_REG_SIZE);  in apbt_set_mapping()
115 	phy_cs_timer_id = (unsigned int)(mtmr->phys_addr & 0xff) /  in apbt_set_mapping()
124 	panic("Failed to setup APB system timer\n");  in apbt_set_mapping()
143 		return -ENODEV;  in apbt_clockevent_register()
146 	adev->num = smp_processor_id();  in apbt_clockevent_register()
147 	adev->timer = dw_apb_clockevent_init(smp_processor_id(), "apbt0",  in apbt_clockevent_register()
149 		APBT_CLOCKEVENT_RATING - 100 : APBT_CLOCKEVENT_RATING,  in apbt_clockevent_register()
152 	adev->timer->eoi = NULL;  in apbt_clockevent_register()
155 		global_clock_event = &adev->timer->ced;  in apbt_clockevent_register()
157 		       global_clock_event->name);  in apbt_clockevent_register()
160 	dw_apb_clockevent_register(adev->timer);  in apbt_clockevent_register()
170 	irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);  in apbt_setup_irq()
171 	irq_set_affinity(adev->irq, cpumask_of(adev->cpu));  in apbt_setup_irq()
186 	if (!adev->timer) {  in apbt_setup_secondary_clock()
187 		adev->timer = dw_apb_clockevent_init(cpu, adev->name,  in apbt_setup_secondary_clock()
189 			adev->irq, apbt_freq);  in apbt_setup_secondary_clock()
190 		adev->timer->eoi = NULL;  in apbt_setup_secondary_clock()
192 		dw_apb_clockevent_resume(adev->timer);  in apbt_setup_secondary_clock()
196 	       cpu, adev->name, adev->cpu);  in apbt_setup_secondary_clock()
199 	dw_apb_clockevent_register(adev->timer);  in apbt_setup_secondary_clock()
218 	dw_apb_clockevent_pause(adev->timer);  in apbt_cpu_dead()
223 		dw_apb_clockevent_stop(adev->timer);  in apbt_cpu_dead()
233 	return cpuhp_setup_state(CPUHP_X86_APB_DEAD, "x86/apb:dead", NULL,  in apbt_late_init()
264 	} while ((now - start) < 200000UL);  in apbt_clocksource_register()
315 	/* kernel cmdline disable apb timer, so we will use lapic timers */  in apbt_time_init()
325 	pr_debug("%s: %d APB timers used\n", __func__, apbt_num_timers_used);  in apbt_time_init()
330 		adev->num = i;  in apbt_time_init()
331 		adev->cpu = i;  in apbt_time_init()
334 			adev->irq = p_mtmr->irq;  in apbt_time_init()
337 		snprintf(adev->name, sizeof(adev->name) - 1, "apbt%d", i);  in apbt_time_init()
346 	panic("failed to enable APB timer\n");  in apbt_time_init()