Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a63b3bc7 D |
2 | /* |
3 | * MPIC timer wakeup driver | |
4 | * | |
5 | * Copyright 2013 Freescale Semiconductor, Inc. | |
a63b3bc7 D |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/device.h> | |
14 | ||
15 | #include <asm/mpic_timer.h> | |
16 | #include <asm/mpic.h> | |
17 | ||
18 | struct fsl_mpic_timer_wakeup { | |
19 | struct mpic_timer *timer; | |
20 | struct work_struct free_work; | |
21 | }; | |
22 | ||
23 | static struct fsl_mpic_timer_wakeup *fsl_wakeup; | |
24 | static DEFINE_MUTEX(sysfs_lock); | |
25 | ||
26 | static void fsl_free_resource(struct work_struct *ws) | |
27 | { | |
28 | struct fsl_mpic_timer_wakeup *wakeup = | |
29 | container_of(ws, struct fsl_mpic_timer_wakeup, free_work); | |
30 | ||
31 | mutex_lock(&sysfs_lock); | |
32 | ||
33 | if (wakeup->timer) { | |
34 | disable_irq_wake(wakeup->timer->irq); | |
35 | mpic_free_timer(wakeup->timer); | |
36 | } | |
37 | ||
38 | wakeup->timer = NULL; | |
39 | mutex_unlock(&sysfs_lock); | |
40 | } | |
41 | ||
42 | static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id) | |
43 | { | |
44 | struct fsl_mpic_timer_wakeup *wakeup = dev_id; | |
45 | ||
46 | schedule_work(&wakeup->free_work); | |
47 | ||
48 | return wakeup->timer ? IRQ_HANDLED : IRQ_NONE; | |
49 | } | |
50 | ||
51 | static ssize_t fsl_timer_wakeup_show(struct device *dev, | |
52 | struct device_attribute *attr, | |
53 | char *buf) | |
54 | { | |
11ed8c55 | 55 | time64_t interval = 0; |
a63b3bc7 D |
56 | |
57 | mutex_lock(&sysfs_lock); | |
58 | if (fsl_wakeup->timer) { | |
59 | mpic_get_remain_time(fsl_wakeup->timer, &interval); | |
11ed8c55 | 60 | interval++; |
a63b3bc7 D |
61 | } |
62 | mutex_unlock(&sysfs_lock); | |
63 | ||
11ed8c55 | 64 | return sprintf(buf, "%lld\n", interval); |
a63b3bc7 D |
65 | } |
66 | ||
67 | static ssize_t fsl_timer_wakeup_store(struct device *dev, | |
68 | struct device_attribute *attr, | |
69 | const char *buf, | |
70 | size_t count) | |
71 | { | |
11ed8c55 | 72 | time64_t interval; |
a63b3bc7 D |
73 | int ret; |
74 | ||
11ed8c55 | 75 | if (kstrtoll(buf, 0, &interval)) |
a63b3bc7 D |
76 | return -EINVAL; |
77 | ||
78 | mutex_lock(&sysfs_lock); | |
79 | ||
80 | if (fsl_wakeup->timer) { | |
81 | disable_irq_wake(fsl_wakeup->timer->irq); | |
82 | mpic_free_timer(fsl_wakeup->timer); | |
83 | fsl_wakeup->timer = NULL; | |
84 | } | |
85 | ||
11ed8c55 | 86 | if (!interval) { |
a63b3bc7 D |
87 | mutex_unlock(&sysfs_lock); |
88 | return count; | |
89 | } | |
90 | ||
91 | fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq, | |
11ed8c55 | 92 | fsl_wakeup, interval); |
a63b3bc7 D |
93 | if (!fsl_wakeup->timer) { |
94 | mutex_unlock(&sysfs_lock); | |
95 | return -EINVAL; | |
96 | } | |
97 | ||
98 | ret = enable_irq_wake(fsl_wakeup->timer->irq); | |
99 | if (ret) { | |
100 | mpic_free_timer(fsl_wakeup->timer); | |
101 | fsl_wakeup->timer = NULL; | |
102 | mutex_unlock(&sysfs_lock); | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
107 | mpic_start_timer(fsl_wakeup->timer); | |
108 | ||
109 | mutex_unlock(&sysfs_lock); | |
110 | ||
111 | return count; | |
112 | } | |
113 | ||
114 | static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644, | |
115 | fsl_timer_wakeup_show, fsl_timer_wakeup_store); | |
116 | ||
117 | static int __init fsl_wakeup_sys_init(void) | |
118 | { | |
c93bd175 | 119 | struct device *dev_root; |
cf34b880 | 120 | int ret = -EINVAL; |
a63b3bc7 D |
121 | |
122 | fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL); | |
123 | if (!fsl_wakeup) | |
124 | return -ENOMEM; | |
125 | ||
126 | INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource); | |
127 | ||
c93bd175 GKH |
128 | dev_root = bus_get_dev_root(&mpic_subsys); |
129 | if (dev_root) { | |
130 | ret = device_create_file(dev_root, &mpic_attributes); | |
131 | put_device(dev_root); | |
132 | if (ret) | |
133 | kfree(fsl_wakeup); | |
134 | } | |
a63b3bc7 D |
135 | |
136 | return ret; | |
137 | } | |
138 | ||
139 | static void __exit fsl_wakeup_sys_exit(void) | |
140 | { | |
c93bd175 GKH |
141 | struct device *dev_root; |
142 | ||
143 | dev_root = bus_get_dev_root(&mpic_subsys); | |
144 | if (dev_root) { | |
145 | device_remove_file(dev_root, &mpic_attributes); | |
146 | put_device(dev_root); | |
147 | } | |
a63b3bc7 D |
148 | |
149 | mutex_lock(&sysfs_lock); | |
150 | ||
151 | if (fsl_wakeup->timer) { | |
152 | disable_irq_wake(fsl_wakeup->timer->irq); | |
153 | mpic_free_timer(fsl_wakeup->timer); | |
154 | } | |
155 | ||
156 | kfree(fsl_wakeup); | |
157 | ||
158 | mutex_unlock(&sysfs_lock); | |
159 | } | |
160 | ||
161 | module_init(fsl_wakeup_sys_init); | |
162 | module_exit(fsl_wakeup_sys_exit); | |
163 | ||
164 | MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver"); | |
165 | MODULE_LICENSE("GPL v2"); | |
166 | MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>"); |