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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
dc11bae7 DL |
2 | /* |
3 | * Copyright (c) 2017, Linaro Ltd. All rights reserved. | |
4 | * | |
5 | * Author: Daniel Lezcano <daniel.lezcano@linaro.org> | |
dc11bae7 DL |
6 | */ |
7 | #include <linux/clk.h> | |
8 | #include <linux/interrupt.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/of_address.h> | |
11 | #include <linux/of_irq.h> | |
12 | #include <linux/slab.h> | |
13 | ||
14 | #include "timer-of.h" | |
15 | ||
cf7f46b9 DL |
16 | /** |
17 | * timer_of_irq_exit - Release the interrupt | |
18 | * @of_irq: an of_timer_irq structure pointer | |
19 | * | |
20 | * Free the irq resource | |
21 | */ | |
5bbf4ad9 | 22 | static __init void timer_of_irq_exit(struct of_timer_irq *of_irq) |
dc11bae7 DL |
23 | { |
24 | struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); | |
25 | ||
26 | struct clock_event_device *clkevt = &to->clkevt; | |
27 | ||
0f1a7b3f LT |
28 | if (of_irq->percpu) |
29 | free_percpu_irq(of_irq->irq, clkevt); | |
30 | else | |
dc11bae7 DL |
31 | free_irq(of_irq->irq, clkevt); |
32 | } | |
33 | ||
cf7f46b9 DL |
34 | /** |
35 | * timer_of_irq_init - Request the interrupt | |
36 | * @np: a device tree node pointer | |
37 | * @of_irq: an of_timer_irq structure pointer | |
38 | * | |
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: | |
41 | * | |
42 | * - Get interrupt number by name | |
43 | * - Get interrupt number by index | |
44 | * | |
45 | * When the interrupt is per CPU, 'request_percpu_irq()' is called, | |
46 | * otherwise 'request_irq()' is used. | |
47 | * | |
48 | * Returns 0 on success, < 0 otherwise | |
49 | */ | |
5bbf4ad9 DL |
50 | static __init int timer_of_irq_init(struct device_node *np, |
51 | struct of_timer_irq *of_irq) | |
dc11bae7 DL |
52 | { |
53 | int ret; | |
54 | struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); | |
55 | struct clock_event_device *clkevt = &to->clkevt; | |
56 | ||
32f2fea6 SS |
57 | if (of_irq->name) { |
58 | of_irq->irq = ret = of_irq_get_byname(np, of_irq->name); | |
59 | if (ret < 0) { | |
ccb80012 GU |
60 | pr_err("Failed to get interrupt %s for %pOF\n", |
61 | of_irq->name, np); | |
32f2fea6 SS |
62 | return ret; |
63 | } | |
64 | } else { | |
65 | of_irq->irq = irq_of_parse_and_map(np, of_irq->index); | |
66 | } | |
dc11bae7 | 67 | if (!of_irq->irq) { |
469869d1 | 68 | pr_err("Failed to map interrupt for %pOF\n", np); |
dc11bae7 DL |
69 | return -EINVAL; |
70 | } | |
71 | ||
72 | ret = of_irq->percpu ? | |
73 | request_percpu_irq(of_irq->irq, of_irq->handler, | |
74 | np->full_name, clkevt) : | |
75 | request_irq(of_irq->irq, of_irq->handler, | |
76 | of_irq->flags ? of_irq->flags : IRQF_TIMER, | |
77 | np->full_name, clkevt); | |
78 | if (ret) { | |
469869d1 | 79 | pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np); |
dc11bae7 DL |
80 | return ret; |
81 | } | |
82 | ||
83 | clkevt->irq = of_irq->irq; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
cf7f46b9 DL |
88 | /** |
89 | * timer_of_clk_exit - Release the clock resources | |
90 | * @of_clk: a of_timer_clk structure pointer | |
91 | * | |
92 | * Disables and releases the refcount on the clk | |
93 | */ | |
5bbf4ad9 | 94 | static __init void timer_of_clk_exit(struct of_timer_clk *of_clk) |
dc11bae7 DL |
95 | { |
96 | of_clk->rate = 0; | |
97 | clk_disable_unprepare(of_clk->clk); | |
98 | clk_put(of_clk->clk); | |
99 | } | |
100 | ||
cf7f46b9 DL |
101 | /** |
102 | * timer_of_clk_init - Initialize the clock resources | |
103 | * @np: a device tree node pointer | |
104 | * @of_clk: a of_timer_clk structure pointer | |
105 | * | |
106 | * Get the clock by name or by index, enable it and get the rate | |
107 | * | |
108 | * Returns 0 on success, < 0 otherwise | |
109 | */ | |
5bbf4ad9 DL |
110 | static __init int timer_of_clk_init(struct device_node *np, |
111 | struct of_timer_clk *of_clk) | |
dc11bae7 DL |
112 | { |
113 | int ret; | |
114 | ||
115 | of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) : | |
116 | of_clk_get(np, of_clk->index); | |
117 | if (IS_ERR(of_clk->clk)) { | |
76371977 JH |
118 | ret = PTR_ERR(of_clk->clk); |
119 | if (ret != -EPROBE_DEFER) | |
120 | pr_err("Failed to get clock for %pOF\n", np); | |
121 | goto out; | |
dc11bae7 DL |
122 | } |
123 | ||
124 | ret = clk_prepare_enable(of_clk->clk); | |
125 | if (ret) { | |
469869d1 | 126 | pr_err("Failed for enable clock for %pOF\n", np); |
dc11bae7 DL |
127 | goto out_clk_put; |
128 | } | |
129 | ||
130 | of_clk->rate = clk_get_rate(of_clk->clk); | |
131 | if (!of_clk->rate) { | |
132 | ret = -EINVAL; | |
469869d1 | 133 | pr_err("Failed to get clock rate for %pOF\n", np); |
dc11bae7 DL |
134 | goto out_clk_disable; |
135 | } | |
136 | ||
137 | of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ); | |
138 | out: | |
139 | return ret; | |
140 | ||
141 | out_clk_disable: | |
142 | clk_disable_unprepare(of_clk->clk); | |
143 | out_clk_put: | |
144 | clk_put(of_clk->clk); | |
145 | ||
146 | goto out; | |
147 | } | |
148 | ||
5bbf4ad9 | 149 | static __init void timer_of_base_exit(struct of_timer_base *of_base) |
dc11bae7 DL |
150 | { |
151 | iounmap(of_base->base); | |
152 | } | |
153 | ||
5bbf4ad9 DL |
154 | static __init int timer_of_base_init(struct device_node *np, |
155 | struct of_timer_base *of_base) | |
dc11bae7 | 156 | { |
9aea417a DL |
157 | of_base->base = of_base->name ? |
158 | of_io_request_and_map(np, of_base->index, of_base->name) : | |
159 | of_iomap(np, of_base->index); | |
4467b8ba GR |
160 | if (IS_ERR_OR_NULL(of_base->base)) { |
161 | pr_err("Failed to iomap (%s:%s)\n", np->name, of_base->name); | |
162 | return of_base->base ? PTR_ERR(of_base->base) : -ENOMEM; | |
dc11bae7 DL |
163 | } |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | int __init timer_of_init(struct device_node *np, struct timer_of *to) | |
169 | { | |
b7dcc4ea | 170 | int ret = -EINVAL; |
dc11bae7 DL |
171 | int flags = 0; |
172 | ||
173 | if (to->flags & TIMER_OF_BASE) { | |
5bbf4ad9 | 174 | ret = timer_of_base_init(np, &to->of_base); |
dc11bae7 DL |
175 | if (ret) |
176 | goto out_fail; | |
177 | flags |= TIMER_OF_BASE; | |
178 | } | |
179 | ||
180 | if (to->flags & TIMER_OF_CLOCK) { | |
5bbf4ad9 | 181 | ret = timer_of_clk_init(np, &to->of_clk); |
dc11bae7 DL |
182 | if (ret) |
183 | goto out_fail; | |
184 | flags |= TIMER_OF_CLOCK; | |
185 | } | |
186 | ||
187 | if (to->flags & TIMER_OF_IRQ) { | |
5bbf4ad9 | 188 | ret = timer_of_irq_init(np, &to->of_irq); |
dc11bae7 DL |
189 | if (ret) |
190 | goto out_fail; | |
191 | flags |= TIMER_OF_IRQ; | |
192 | } | |
193 | ||
194 | if (!to->clkevt.name) | |
4411464d | 195 | to->clkevt.name = np->full_name; |
1c63c1c0 DL |
196 | |
197 | to->np = np; | |
198 | ||
dc11bae7 DL |
199 | return ret; |
200 | ||
201 | out_fail: | |
202 | if (flags & TIMER_OF_IRQ) | |
5bbf4ad9 | 203 | timer_of_irq_exit(&to->of_irq); |
dc11bae7 DL |
204 | |
205 | if (flags & TIMER_OF_CLOCK) | |
5bbf4ad9 | 206 | timer_of_clk_exit(&to->of_clk); |
dc11bae7 DL |
207 | |
208 | if (flags & TIMER_OF_BASE) | |
5bbf4ad9 | 209 | timer_of_base_exit(&to->of_base); |
b7dcc4ea | 210 | return ret; |
dc11bae7 | 211 | } |
f48729a9 | 212 | |
558de282 | 213 | /** |
4bf07f65 | 214 | * timer_of_cleanup - release timer_of resources |
558de282 BG |
215 | * @to: timer_of structure |
216 | * | |
4bf07f65 | 217 | * Release the resources that has been used in timer_of_init(). |
558de282 BG |
218 | * This function should be called in init error cases |
219 | */ | |
220 | void __init timer_of_cleanup(struct timer_of *to) | |
f48729a9 BG |
221 | { |
222 | if (to->flags & TIMER_OF_IRQ) | |
5bbf4ad9 | 223 | timer_of_irq_exit(&to->of_irq); |
f48729a9 BG |
224 | |
225 | if (to->flags & TIMER_OF_CLOCK) | |
5bbf4ad9 | 226 | timer_of_clk_exit(&to->of_clk); |
f48729a9 BG |
227 | |
228 | if (to->flags & TIMER_OF_BASE) | |
5bbf4ad9 | 229 | timer_of_base_exit(&to->of_base); |
f48729a9 | 230 | } |