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 	free_irq(of_irq->irq, clkevt);  in timer_of_irq_exit()
32  * timer_of_irq_init - Request the interrupt
36  * Get the interrupt number from the DT from its definition and
37  * request it. The interrupt is gotten by falling back the following way:
39  * - Get interrupt number by name
40  * - Get interrupt number by index
49 	struct clock_event_device *clkevt = &to->clkevt;  in timer_of_irq_init()
51 	if (of_irq->name) {  in timer_of_irq_init()
52 		of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);  in timer_of_irq_init()
54 			pr_err("Failed to get interrupt %s for %pOF\n",  in timer_of_irq_init()
55 			       of_irq->name, np);  in timer_of_irq_init()
59 		of_irq->irq = irq_of_parse_and_map(np, of_irq->index);  in timer_of_irq_init()
61 	if (!of_irq->irq) {  in timer_of_irq_init()
62 		pr_err("Failed to map interrupt for %pOF\n", np);  in timer_of_irq_init()
63 		return -EINVAL;  in timer_of_irq_init()
66 	ret = request_irq(of_irq->irq, of_irq->handler,  in timer_of_irq_init()
67 			  of_irq->flags ? of_irq->flags : IRQF_TIMER,  in timer_of_irq_init()
68 			  np->full_name, clkevt);  in timer_of_irq_init()
70 		pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);  in timer_of_irq_init()
74 	clkevt->irq = of_irq->irq;  in timer_of_irq_init()
80  * timer_of_clk_exit - Release the clock resources
83  * Disables and releases the refcount on the clk
87 	of_clk->rate = 0;  in timer_of_clk_exit()
88 	clk_disable_unprepare(of_clk->clk);  in timer_of_clk_exit()
89 	clk_put(of_clk->clk);  in timer_of_clk_exit()
93  * timer_of_clk_init - Initialize the clock resources
106 	of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :  in timer_of_clk_init()
107 		of_clk_get(np, of_clk->index);  in timer_of_clk_init()
108 	if (IS_ERR(of_clk->clk)) {  in timer_of_clk_init()
109 		ret = PTR_ERR(of_clk->clk);  in timer_of_clk_init()
110 		if (ret != -EPROBE_DEFER)  in timer_of_clk_init()
115 	ret = clk_prepare_enable(of_clk->clk);  in timer_of_clk_init()
121 	of_clk->rate = clk_get_rate(of_clk->clk);  in timer_of_clk_init()
122 	if (!of_clk->rate) {  in timer_of_clk_init()
123 		ret = -EINVAL;  in timer_of_clk_init()
128 	of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);  in timer_of_clk_init()
133 	clk_disable_unprepare(of_clk->clk);  in timer_of_clk_init()
135 	clk_put(of_clk->clk);  in timer_of_clk_init()
142 	iounmap(of_base->base);  in timer_of_base_exit()
148 	of_base->base = of_base->name ?  in timer_of_base_init()
149 		of_io_request_and_map(np, of_base->index, of_base->name) :  in timer_of_base_init()
150 		of_iomap(np, of_base->index);  in timer_of_base_init()
151 	if (IS_ERR_OR_NULL(of_base->base)) {  in timer_of_base_init()
152 		pr_err("Failed to iomap (%s:%s)\n", np->name, of_base->name);  in timer_of_base_init()
153 		return of_base->base ? PTR_ERR(of_base->base) : -ENOMEM;  in timer_of_base_init()
161 	int ret = -EINVAL;  in timer_of_init()
164 	if (to->flags & TIMER_OF_BASE) {  in timer_of_init()
165 		ret = timer_of_base_init(np, &to->of_base);  in timer_of_init()
171 	if (to->flags & TIMER_OF_CLOCK) {  in timer_of_init()
172 		ret = timer_of_clk_init(np, &to->of_clk);  in timer_of_init()
178 	if (to->flags & TIMER_OF_IRQ) {  in timer_of_init()
179 		ret = timer_of_irq_init(np, &to->of_irq);  in timer_of_init()
185 	if (!to->clkevt.name)  in timer_of_init()
186 		to->clkevt.name = np->full_name;  in timer_of_init()
188 	to->np = np;  in timer_of_init()
194 		timer_of_irq_exit(&to->of_irq);  in timer_of_init()
197 		timer_of_clk_exit(&to->of_clk);  in timer_of_init()
200 		timer_of_base_exit(&to->of_base);  in timer_of_init()
205  * timer_of_cleanup - release timer_of resources
213 	if (to->flags & TIMER_OF_IRQ)  in timer_of_cleanup()
214 		timer_of_irq_exit(&to->of_irq);  in timer_of_cleanup()
216 	if (to->flags & TIMER_OF_CLOCK)  in timer_of_cleanup()
217 		timer_of_clk_exit(&to->of_clk);  in timer_of_cleanup()
219 	if (to->flags & TIMER_OF_BASE)  in timer_of_cleanup()
220 		timer_of_base_exit(&to->of_base);  in timer_of_cleanup()