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dc11bae7 DL |
1 | /* |
2 | * Copyright (c) 2017, Linaro Ltd. All rights reserved. | |
3 | * | |
4 | * Author: Daniel Lezcano <daniel.lezcano@linaro.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | #include <linux/clk.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/of_irq.h> | |
23 | #include <linux/slab.h> | |
24 | ||
25 | #include "timer-of.h" | |
26 | ||
27 | static __init void timer_irq_exit(struct of_timer_irq *of_irq) | |
28 | { | |
29 | struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); | |
30 | ||
31 | struct clock_event_device *clkevt = &to->clkevt; | |
32 | ||
33 | of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) : | |
34 | free_irq(of_irq->irq, clkevt); | |
35 | } | |
36 | ||
37 | static __init int timer_irq_init(struct device_node *np, | |
38 | struct of_timer_irq *of_irq) | |
39 | { | |
40 | int ret; | |
41 | struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); | |
42 | struct clock_event_device *clkevt = &to->clkevt; | |
43 | ||
44 | of_irq->irq = of_irq->name ? of_irq_get_byname(np, of_irq->name): | |
45 | irq_of_parse_and_map(np, of_irq->index); | |
46 | if (!of_irq->irq) { | |
47 | pr_err("Failed to map interrupt for %s\n", np->full_name); | |
48 | return -EINVAL; | |
49 | } | |
50 | ||
51 | ret = of_irq->percpu ? | |
52 | request_percpu_irq(of_irq->irq, of_irq->handler, | |
53 | np->full_name, clkevt) : | |
54 | request_irq(of_irq->irq, of_irq->handler, | |
55 | of_irq->flags ? of_irq->flags : IRQF_TIMER, | |
56 | np->full_name, clkevt); | |
57 | if (ret) { | |
58 | pr_err("Failed to request irq %d for %s\n", of_irq->irq, | |
59 | np->full_name); | |
60 | return ret; | |
61 | } | |
62 | ||
63 | clkevt->irq = of_irq->irq; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static __init void timer_clk_exit(struct of_timer_clk *of_clk) | |
69 | { | |
70 | of_clk->rate = 0; | |
71 | clk_disable_unprepare(of_clk->clk); | |
72 | clk_put(of_clk->clk); | |
73 | } | |
74 | ||
75 | static __init int timer_clk_init(struct device_node *np, | |
76 | struct of_timer_clk *of_clk) | |
77 | { | |
78 | int ret; | |
79 | ||
80 | of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) : | |
81 | of_clk_get(np, of_clk->index); | |
82 | if (IS_ERR(of_clk->clk)) { | |
83 | pr_err("Failed to get clock for %s\n", np->full_name); | |
84 | return PTR_ERR(of_clk->clk); | |
85 | } | |
86 | ||
87 | ret = clk_prepare_enable(of_clk->clk); | |
88 | if (ret) { | |
89 | pr_err("Failed for enable clock for %s\n", np->full_name); | |
90 | goto out_clk_put; | |
91 | } | |
92 | ||
93 | of_clk->rate = clk_get_rate(of_clk->clk); | |
94 | if (!of_clk->rate) { | |
95 | ret = -EINVAL; | |
96 | pr_err("Failed to get clock rate for %s\n", np->full_name); | |
97 | goto out_clk_disable; | |
98 | } | |
99 | ||
100 | of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ); | |
101 | out: | |
102 | return ret; | |
103 | ||
104 | out_clk_disable: | |
105 | clk_disable_unprepare(of_clk->clk); | |
106 | out_clk_put: | |
107 | clk_put(of_clk->clk); | |
108 | ||
109 | goto out; | |
110 | } | |
111 | ||
112 | static __init void timer_base_exit(struct of_timer_base *of_base) | |
113 | { | |
114 | iounmap(of_base->base); | |
115 | } | |
116 | ||
117 | static __init int timer_base_init(struct device_node *np, | |
118 | struct of_timer_base *of_base) | |
119 | { | |
120 | const char *name = of_base->name ? of_base->name : np->full_name; | |
121 | ||
122 | of_base->base = of_io_request_and_map(np, of_base->index, name); | |
22ece4e3 | 123 | if (!of_base->base) { |
dc11bae7 DL |
124 | pr_err("Failed to iomap (%s)\n", name); |
125 | return -ENXIO; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | int __init timer_of_init(struct device_node *np, struct timer_of *to) | |
132 | { | |
b7dcc4ea | 133 | int ret = -EINVAL; |
dc11bae7 DL |
134 | int flags = 0; |
135 | ||
136 | if (to->flags & TIMER_OF_BASE) { | |
137 | ret = timer_base_init(np, &to->of_base); | |
138 | if (ret) | |
139 | goto out_fail; | |
140 | flags |= TIMER_OF_BASE; | |
141 | } | |
142 | ||
143 | if (to->flags & TIMER_OF_CLOCK) { | |
144 | ret = timer_clk_init(np, &to->of_clk); | |
145 | if (ret) | |
146 | goto out_fail; | |
147 | flags |= TIMER_OF_CLOCK; | |
148 | } | |
149 | ||
150 | if (to->flags & TIMER_OF_IRQ) { | |
151 | ret = timer_irq_init(np, &to->of_irq); | |
152 | if (ret) | |
153 | goto out_fail; | |
154 | flags |= TIMER_OF_IRQ; | |
155 | } | |
156 | ||
157 | if (!to->clkevt.name) | |
158 | to->clkevt.name = np->name; | |
dc11bae7 DL |
159 | return ret; |
160 | ||
161 | out_fail: | |
162 | if (flags & TIMER_OF_IRQ) | |
163 | timer_irq_exit(&to->of_irq); | |
164 | ||
165 | if (flags & TIMER_OF_CLOCK) | |
166 | timer_clk_exit(&to->of_clk); | |
167 | ||
168 | if (flags & TIMER_OF_BASE) | |
169 | timer_base_exit(&to->of_base); | |
b7dcc4ea | 170 | return ret; |
dc11bae7 | 171 | } |