drivers/clocksource/timer-clint.c

1 // SPDX-License-Identifier: GPL-2.0
5  * Most of the M-mode (i.e. NoMMU) RISC-V systems usually have a
18 #include <linux/io-64-nonatomic-lo-hi.h>
35 /* CLINT manages IPI and Timer for RISC-V M-mode  */
104 	.name		= "clint_clocksource",
123 	.name		= "clint_clockevent",
133 	ce->cpumask = cpumask_of(cpu);  in clint_timer_starting_cpu()
149 	 * via generic IPI-Mux  in clint_timer_dying_cpu()
159 	evdev->event_handler(evdev);  in clint_timer_interrupt()
166 	int rc;  in clint_timer_init_dt()  local
187 			return -ENODEV;  in clint_timer_init_dt()
190 		/* Find parent irq domain and map ipi irq */  in clint_timer_init_dt()
196 		/* Find parent irq domain and map timer irq */  in clint_timer_init_dt()
206 		return -ENODEV;  in clint_timer_init_dt()
211 		pr_err("%pOFP: could not map registers\n", np);  in clint_timer_init_dt()
212 		return -ENODEV;  in clint_timer_init_dt()
230 	rc = clocksource_register_hz(&clint_clocksource, clint_timer_freq);  in clint_timer_init_dt()
231 	if (rc) {  in clint_timer_init_dt()
232 		pr_err("%pOFP: clocksource register failed [%d]\n", np, rc);  in clint_timer_init_dt()
238 	rc = request_percpu_irq(clint_timer_irq, clint_timer_interrupt,  in clint_timer_init_dt()
239 				 "clint-timer", &clint_clock_event);  in clint_timer_init_dt()
240 	if (rc) {  in clint_timer_init_dt()
241 		pr_err("registering percpu irq failed [%d]\n", rc);  in clint_timer_init_dt()
246 	rc = ipi_mux_create(BITS_PER_BYTE, clint_send_ipi);  in clint_timer_init_dt()
247 	if (rc <= 0) {  in clint_timer_init_dt()
249 		rc = (rc < 0) ? rc : -ENODEV;  in clint_timer_init_dt()
254 	riscv_ipi_set_virq_range(rc, BITS_PER_BYTE);  in clint_timer_init_dt()
258 	rc = cpuhp_setup_state(CPUHP_AP_CLINT_TIMER_STARTING,  in clint_timer_init_dt()
262 	if (rc) {  in clint_timer_init_dt()
263 		pr_err("%pOFP: cpuhp setup state failed [%d]\n", np, rc);  in clint_timer_init_dt()
273 	return rc;  in clint_timer_init_dt()