drivers/clocksource/timer-riscv.c

1 // SPDX-License-Identifier: GPL-2.0
6  * All RISC-V systems have a timer attached to every hart.  These timers can
11 #define pr_fmt(fmt) "riscv-timer: " fmt
16 #include <linux/cpu.h>
22 #include <linux/io-64-nonatomic-lo-hi.h>
26 #include <clocksource/timer-riscv.h>
107 static int riscv_timer_starting_cpu(unsigned int cpu)  in riscv_timer_starting_cpu()  argument
109 	struct clock_event_device *ce = per_cpu_ptr(&riscv_clock_event, cpu);  in riscv_timer_starting_cpu()
111 	/* Clear timer interrupt */  in riscv_timer_starting_cpu()
114 	ce->cpumask = cpumask_of(cpu);  in riscv_timer_starting_cpu()
115 	ce->irq = riscv_clock_event_irq;  in riscv_timer_starting_cpu()
117 		ce->features |= CLOCK_EVT_FEAT_C3STOP;  in riscv_timer_starting_cpu()
119 		ce->rating = 450;  in riscv_timer_starting_cpu()
127 static int riscv_timer_dying_cpu(unsigned int cpu)  in riscv_timer_dying_cpu()  argument
140 /* called directly from the low-level interrupt handler */
146 	evdev->event_handler(evdev);  in riscv_timer_interrupt()
161 		return -ENODEV;  in riscv_timer_init_common()
166 		pr_err("Failed to map timer interrupt for node [%pfwP]\n", intc_fwnode);  in riscv_timer_init_common()
167 		return -ENODEV;  in riscv_timer_init_common()
172 		pr_err("RISCV timer registration failed [%d]\n", error);  in riscv_timer_init_common()
180 				    "riscv-timer", &riscv_clock_event);  in riscv_timer_init_common()
187 		pr_info("Timer interrupt in S-mode is available via sstc extension\n");  in riscv_timer_init_common()
192 			 "clockevents/riscv/timer:starting",  in riscv_timer_init_common()
195 		pr_err("cpu hp setup state failed for RISCV timer [%d]\n",  in riscv_timer_init_common()
223 	child = of_find_compatible_node(NULL, NULL, "riscv,timer");  in riscv_timer_init_dt()
226 					"riscv,timer-cannot-wake-cpu");  in riscv_timer_init_dt()
240 	riscv_timer_cannot_wake_cpu = rhct->flags & ACPI_RHCT_TIMER_CANNOT_WAKEUP_CPU;  in riscv_timer_acpi_init()