1 // SPDX-License-Identifier: GPL-2.0-only
43  * We are expecting to be clocked by the ARM peripheral clock.
55  * 1. Read the upper 32-bit timer counter register
56  * 2. Read the lower 32-bit timer counter register
57  * 3. Read the upper 32-bit timer counter register again. If the value is
58  *  different to the 32-bit upper value read previously, go back to step 2.
59  *  Otherwise the 64-bit timer counter value is correct.
89  * 2. Write the lower 32-bit Comparator Value Register.
90  * 3. Write the upper 32-bit Comparator Value Register.
147 	 * the same event in single-shot mode)  in gt_clockevent_interrupt()
149 	 *	Either disable single-shot mode.  in gt_clockevent_interrupt()
160 	evt->event_handler(evt);  in gt_clockevent_interrupt()
169 	clk->name = "arm_global_timer";  in gt_starting_cpu()
170 	clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |  in gt_starting_cpu()
172 	clk->set_state_shutdown = gt_clockevent_shutdown;  in gt_starting_cpu()
173 	clk->set_state_periodic = gt_clockevent_set_periodic;  in gt_starting_cpu()
174 	clk->set_state_oneshot = gt_clockevent_shutdown;  in gt_starting_cpu()
175 	clk->set_state_oneshot_stopped = gt_clockevent_shutdown;  in gt_starting_cpu()
176 	clk->set_next_event = gt_clockevent_set_next_event;  in gt_starting_cpu()
177 	clk->cpumask = cpumask_of(cpu);  in gt_starting_cpu()
178 	clk->rating = 300;  in gt_starting_cpu()
179 	clk->irq = gt_ppi;  in gt_starting_cpu()
182 	enable_percpu_irq(clk->irq, IRQ_TYPE_NONE);  in gt_starting_cpu()
191 	disable_percpu_irq(clk->irq);  in gt_dying_cpu()
206 		/* re-enable timer on resume */  in gt_resume()
267 		pr_warn("global-timer: non support for this cpu version.\n");  in global_timer_of_register()
268 		return -ENOSYS;  in global_timer_of_register()
273 		pr_warn("global-timer: unable to parse irq\n");  in global_timer_of_register()
274 		return -EINVAL;  in global_timer_of_register()
279 		pr_warn("global-timer: invalid base address\n");  in global_timer_of_register()
280 		return -ENXIO;  in global_timer_of_register()
289 		pr_warn("global-timer: clk not found\n");  in global_timer_of_register()
290 		err = -EINVAL;  in global_timer_of_register()
297 		pr_warn("global-timer: can't allocate memory\n");  in global_timer_of_register()
298 		err = -ENOMEM;  in global_timer_of_register()
305 		pr_warn("global-timer: can't register interrupt %d (%d)\n",  in global_timer_of_register()
339 TIMER_OF_DECLARE(arm_gt, "arm,cortex-a9-global-timer",