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1da177e4 LT |
1 | /* |
2 | * mpc8xx_wdt.c - MPC8xx watchdog userspace interface | |
3 | * | |
4 | * Author: Florian Schirmer <jolt@tuxbox.org> | |
5 | * | |
6 | * 2002 (c) Florian Schirmer <jolt@tuxbox.org> This file is licensed under | |
7 | * the terms of the GNU General Public License version 2. This program | |
8 | * is licensed "as is" without any warranty of any kind, whether express | |
9 | * or implied. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/fs.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/miscdevice.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/watchdog.h> | |
18 | #include <asm/8xx_immap.h> | |
19 | #include <asm/uaccess.h> | |
398f6858 | 20 | #include <asm/io.h> |
1da177e4 LT |
21 | #include <syslib/m8xx_wdt.h> |
22 | ||
23 | static unsigned long wdt_opened; | |
24 | static int wdt_status; | |
25 | ||
26 | static void mpc8xx_wdt_handler_disable(void) | |
27 | { | |
398f6858 MT |
28 | volatile uint __iomem *piscr; |
29 | piscr = (uint *)&((immap_t*)IMAP_ADDR)->im_sit.sit_piscr; | |
1da177e4 | 30 | |
fb64c244 MT |
31 | if (!m8xx_has_internal_rtc) |
32 | m8xx_wdt_stop_timer(); | |
33 | else | |
398f6858 | 34 | out_be32(piscr, in_be32(piscr) & ~(PISCR_PIE | PISCR_PTE)); |
1da177e4 LT |
35 | |
36 | printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler deactivated\n"); | |
37 | } | |
38 | ||
39 | static void mpc8xx_wdt_handler_enable(void) | |
40 | { | |
398f6858 MT |
41 | volatile uint __iomem *piscr; |
42 | piscr = (uint *)&((immap_t*)IMAP_ADDR)->im_sit.sit_piscr; | |
1da177e4 | 43 | |
fb64c244 MT |
44 | if (!m8xx_has_internal_rtc) |
45 | m8xx_wdt_install_timer(); | |
46 | else | |
398f6858 | 47 | out_be32(piscr, in_be32(piscr) | PISCR_PIE | PISCR_PTE); |
1da177e4 LT |
48 | |
49 | printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler activated\n"); | |
50 | } | |
51 | ||
52 | static int mpc8xx_wdt_open(struct inode *inode, struct file *file) | |
53 | { | |
54 | if (test_and_set_bit(0, &wdt_opened)) | |
55 | return -EBUSY; | |
56 | ||
57 | m8xx_wdt_reset(); | |
58 | mpc8xx_wdt_handler_disable(); | |
59 | ||
ec9505a7 | 60 | return nonseekable_open(inode, file); |
1da177e4 LT |
61 | } |
62 | ||
63 | static int mpc8xx_wdt_release(struct inode *inode, struct file *file) | |
64 | { | |
65 | m8xx_wdt_reset(); | |
66 | ||
67 | #if !defined(CONFIG_WATCHDOG_NOWAYOUT) | |
68 | mpc8xx_wdt_handler_enable(); | |
69 | #endif | |
70 | ||
71 | clear_bit(0, &wdt_opened); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static ssize_t mpc8xx_wdt_write(struct file *file, const char *data, size_t len, | |
77 | loff_t * ppos) | |
78 | { | |
1da177e4 LT |
79 | if (len) |
80 | m8xx_wdt_reset(); | |
81 | ||
82 | return len; | |
83 | } | |
84 | ||
85 | static int mpc8xx_wdt_ioctl(struct inode *inode, struct file *file, | |
86 | unsigned int cmd, unsigned long arg) | |
87 | { | |
88 | int timeout; | |
89 | static struct watchdog_info info = { | |
90 | .options = WDIOF_KEEPALIVEPING, | |
91 | .firmware_version = 0, | |
92 | .identity = "MPC8xx watchdog", | |
93 | }; | |
94 | ||
95 | switch (cmd) { | |
96 | case WDIOC_GETSUPPORT: | |
97 | if (copy_to_user((void *)arg, &info, sizeof(info))) | |
98 | return -EFAULT; | |
99 | break; | |
100 | ||
101 | case WDIOC_GETSTATUS: | |
102 | case WDIOC_GETBOOTSTATUS: | |
103 | if (put_user(wdt_status, (int *)arg)) | |
104 | return -EFAULT; | |
105 | wdt_status &= ~WDIOF_KEEPALIVEPING; | |
106 | break; | |
107 | ||
108 | case WDIOC_GETTEMP: | |
109 | return -EOPNOTSUPP; | |
110 | ||
111 | case WDIOC_SETOPTIONS: | |
112 | return -EOPNOTSUPP; | |
113 | ||
114 | case WDIOC_KEEPALIVE: | |
115 | m8xx_wdt_reset(); | |
116 | wdt_status |= WDIOF_KEEPALIVEPING; | |
117 | break; | |
118 | ||
119 | case WDIOC_SETTIMEOUT: | |
120 | return -EOPNOTSUPP; | |
121 | ||
122 | case WDIOC_GETTIMEOUT: | |
123 | timeout = m8xx_wdt_get_timeout(); | |
124 | if (put_user(timeout, (int *)arg)) | |
125 | return -EFAULT; | |
126 | break; | |
127 | ||
128 | default: | |
795b89d2 | 129 | return -ENOTTY; |
1da177e4 LT |
130 | } |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
62322d25 | 135 | static const struct file_operations mpc8xx_wdt_fops = { |
1da177e4 LT |
136 | .owner = THIS_MODULE, |
137 | .llseek = no_llseek, | |
138 | .write = mpc8xx_wdt_write, | |
139 | .ioctl = mpc8xx_wdt_ioctl, | |
140 | .open = mpc8xx_wdt_open, | |
141 | .release = mpc8xx_wdt_release, | |
142 | }; | |
143 | ||
144 | static struct miscdevice mpc8xx_wdt_miscdev = { | |
145 | .minor = WATCHDOG_MINOR, | |
146 | .name = "watchdog", | |
147 | .fops = &mpc8xx_wdt_fops, | |
148 | }; | |
149 | ||
150 | static int __init mpc8xx_wdt_init(void) | |
151 | { | |
152 | return misc_register(&mpc8xx_wdt_miscdev); | |
153 | } | |
154 | ||
155 | static void __exit mpc8xx_wdt_exit(void) | |
156 | { | |
157 | misc_deregister(&mpc8xx_wdt_miscdev); | |
158 | ||
159 | m8xx_wdt_reset(); | |
160 | mpc8xx_wdt_handler_enable(); | |
161 | } | |
162 | ||
163 | module_init(mpc8xx_wdt_init); | |
164 | module_exit(mpc8xx_wdt_exit); | |
165 | ||
166 | MODULE_AUTHOR("Florian Schirmer <jolt@tuxbox.org>"); | |
167 | MODULE_DESCRIPTION("MPC8xx watchdog driver"); | |
168 | MODULE_LICENSE("GPL"); | |
169 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |