1 // SPDX-License-Identifier: GPL-2.0-only
10 #include <linux/clk.h>
18 #include <linux/interrupt.h>
28 static struct clk *twd_clk;
37 static int twd_shutdown(struct clock_event_device *clk)  in twd_shutdown()  argument
43 static int twd_set_oneshot(struct clock_event_device *clk)  in twd_set_oneshot()  argument
51 static int twd_set_periodic(struct clock_event_device *clk)  in twd_set_periodic()  argument
77  * local_timer_ack: checks for a local timer interrupt.
79  * If a local timer interrupt has occurred, acknowledge and return 1.
94 	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);  in twd_timer_stop()  local
96 	twd_shutdown(clk);  in twd_timer_stop()
97 	disable_percpu_irq(clk->irq);  in twd_timer_stop()
118 	 * frequency.  The timer is local to a cpu, so cross-call to the  in twd_rate_change()
123 				  (void *)&cnd->new_rate, 1);  in twd_rate_change()
162 				 /* enable, no interrupt or reload */  in twd_calibrate_rate()
173 		twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);  in twd_calibrate_rate()
185 		evt->event_handler(evt);  in twd_handler()
221 	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);  in twd_timer_setup()  local
230 		clockevents_register_device(clk);  in twd_timer_setup()
231 		enable_percpu_irq(clk->irq, 0);  in twd_timer_setup()
244 	clk->name = "local_timer";  in twd_timer_setup()
245 	clk->features = twd_features;  in twd_timer_setup()
246 	clk->rating = 350;  in twd_timer_setup()
247 	clk->set_state_shutdown = twd_shutdown;  in twd_timer_setup()
248 	clk->set_state_periodic = twd_set_periodic;  in twd_timer_setup()
249 	clk->set_state_oneshot = twd_set_oneshot;  in twd_timer_setup()
250 	clk->tick_resume = twd_shutdown;  in twd_timer_setup()
251 	clk->set_next_event = twd_set_next_event;  in twd_timer_setup()
252 	clk->irq = twd_ppi;  in twd_timer_setup()
253 	clk->cpumask = cpumask_of(cpu);  in twd_timer_setup()
255 	clockevents_config_and_register(clk, twd_timer_rate,  in twd_timer_setup()
257 	enable_percpu_irq(clk->irq, 0);  in twd_timer_setup()
278 		err = -ENOMEM;  in twd_local_timer_common_register()
284 		pr_err("twd: can't register interrupt %d (%d)\n", twd_ppi, err);  in twd_local_timer_common_register()
293 	if (!of_property_read_bool(np, "always-on"))  in twd_local_timer_common_register()
322 		err = -EINVAL;  in twd_local_timer_of_register()
328 		err = -ENOMEM;  in twd_local_timer_of_register()
338 TIMER_OF_DECLARE(arm_twd_a9, "arm,cortex-a9-twd-timer", twd_local_timer_of_register);
339 TIMER_OF_DECLARE(arm_twd_a5, "arm,cortex-a5-twd-timer", twd_local_timer_of_register);
340 TIMER_OF_DECLARE(arm_twd_11mp, "arm,arm11mp-twd-timer", twd_local_timer_of_register);