1 // SPDX-License-Identifier: GPL-2.0-only
7 #include <linux/clk.h>
8 #include <linux/interrupt.h>
14 #include "timer-of.h"
17  * timer_of_irq_exit - Release the interrupt
26 	struct clock_event_device *clkevt = &to->clkevt;  in timer_of_irq_exit()
28 	if (of_irq->percpu)  in timer_of_irq_exit()
29 		free_percpu_irq(of_irq->irq, clkevt);  in timer_of_irq_exit()
31 		free_irq(of_irq->irq, clkevt);  in timer_of_irq_exit()
35  * timer_of_irq_init - Request the interrupt
39  * Get the interrupt number from the DT from its definition and
40  * request it. The interrupt is gotten by falling back the following way:
42  * - Get interrupt number by name
43  * - Get interrupt number by index
45  * When the interrupt is per CPU, 'request_percpu_irq()' is called,
55 	struct clock_event_device *clkevt = &to->clkevt;  in timer_of_irq_init()
57 	if (of_irq->name) {  in timer_of_irq_init()
58 		of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);  in timer_of_irq_init()
60 			pr_err("Failed to get interrupt %s for %pOF\n",  in timer_of_irq_init()
61 			       of_irq->name, np);  in timer_of_irq_init()
65 		of_irq->irq = irq_of_parse_and_map(np, of_irq->index);  in timer_of_irq_init()
67 	if (!of_irq->irq) {  in timer_of_irq_init()
68 		pr_err("Failed to map interrupt for %pOF\n", np);  in timer_of_irq_init()
69 		return -EINVAL;  in timer_of_irq_init()
72 	ret = of_irq->percpu ?  in timer_of_irq_init()
73 		request_percpu_irq(of_irq->irq, of_irq->handler,  in timer_of_irq_init()
74 				   np->full_name, clkevt) :  in timer_of_irq_init()
75 		request_irq(of_irq->irq, of_irq->handler,  in timer_of_irq_init()
76 			    of_irq->flags ? of_irq->flags : IRQF_TIMER,  in timer_of_irq_init()
77 			    np->full_name, clkevt);  in timer_of_irq_init()
79 		pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);  in timer_of_irq_init()
83 	clkevt->irq = of_irq->irq;  in timer_of_irq_init()
89  * timer_of_clk_exit - Release the clock resources
92  * Disables and releases the refcount on the clk
96 	of_clk->rate = 0;  in timer_of_clk_exit()
97 	clk_disable_unprepare(of_clk->clk);  in timer_of_clk_exit()
98 	clk_put(of_clk->clk);  in timer_of_clk_exit()
102  * timer_of_clk_init - Initialize the clock resources
115 	of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :  in timer_of_clk_init()
116 		of_clk_get(np, of_clk->index);  in timer_of_clk_init()
117 	if (IS_ERR(of_clk->clk)) {  in timer_of_clk_init()
118 		ret = PTR_ERR(of_clk->clk);  in timer_of_clk_init()
119 		if (ret != -EPROBE_DEFER)  in timer_of_clk_init()
124 	ret = clk_prepare_enable(of_clk->clk);  in timer_of_clk_init()
130 	of_clk->rate = clk_get_rate(of_clk->clk);  in timer_of_clk_init()
131 	if (!of_clk->rate) {  in timer_of_clk_init()
132 		ret = -EINVAL;  in timer_of_clk_init()
137 	of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);  in timer_of_clk_init()
142 	clk_disable_unprepare(of_clk->clk);  in timer_of_clk_init()
144 	clk_put(of_clk->clk);  in timer_of_clk_init()
151 	iounmap(of_base->base);  in timer_of_base_exit()
157 	of_base->base = of_base->name ?  in timer_of_base_init()
158 		of_io_request_and_map(np, of_base->index, of_base->name) :  in timer_of_base_init()
159 		of_iomap(np, of_base->index);  in timer_of_base_init()
160 	if (IS_ERR_OR_NULL(of_base->base)) {  in timer_of_base_init()
161 		pr_err("Failed to iomap (%s:%s)\n", np->name, of_base->name);  in timer_of_base_init()
162 		return of_base->base ? PTR_ERR(of_base->base) : -ENOMEM;  in timer_of_base_init()
170 	int ret = -EINVAL;  in timer_of_init()
173 	if (to->flags & TIMER_OF_BASE) {  in timer_of_init()
174 		ret = timer_of_base_init(np, &to->of_base);  in timer_of_init()
180 	if (to->flags & TIMER_OF_CLOCK) {  in timer_of_init()
181 		ret = timer_of_clk_init(np, &to->of_clk);  in timer_of_init()
187 	if (to->flags & TIMER_OF_IRQ) {  in timer_of_init()
188 		ret = timer_of_irq_init(np, &to->of_irq);  in timer_of_init()
194 	if (!to->clkevt.name)  in timer_of_init()
195 		to->clkevt.name = np->full_name;  in timer_of_init()
197 	to->np = np;  in timer_of_init()
203 		timer_of_irq_exit(&to->of_irq);  in timer_of_init()
206 		timer_of_clk_exit(&to->of_clk);  in timer_of_init()
209 		timer_of_base_exit(&to->of_base);  in timer_of_init()
214  * timer_of_cleanup - release timer_of resources
222 	if (to->flags & TIMER_OF_IRQ)  in timer_of_cleanup()
223 		timer_of_irq_exit(&to->of_irq);  in timer_of_cleanup()
225 	if (to->flags & TIMER_OF_CLOCK)  in timer_of_cleanup()
226 		timer_of_clk_exit(&to->of_clk);  in timer_of_cleanup()
228 	if (to->flags & TIMER_OF_BASE)  in timer_of_cleanup()
229 		timer_of_base_exit(&to->of_base);  in timer_of_cleanup()