diff options
-rw-r--r-- | drivers/watchdog/Kconfig | 9 | ||||
-rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
-rw-r--r-- | drivers/watchdog/stmp3xxx_wdt.c | 296 |
3 files changed, 306 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index c4c2206d6f3e..70d7f8cc06b7 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig | |||
@@ -257,6 +257,15 @@ config TWL4030_WATCHDOG | |||
257 | Support for TI TWL4030 watchdog. Say 'Y' here to enable the | 257 | Support for TI TWL4030 watchdog. Say 'Y' here to enable the |
258 | watchdog timer support for TWL4030 chips. | 258 | watchdog timer support for TWL4030 chips. |
259 | 259 | ||
260 | config STMP3XXX_WATCHDOG | ||
261 | tristate "Freescale STMP3XXX watchdog" | ||
262 | depends on ARCH_STMP3XXX | ||
263 | help | ||
264 | Say Y here if to include support for the watchdog timer | ||
265 | for the Sigmatel STMP37XX/378X SoC. | ||
266 | To compile this driver as a module, choose M here: the | ||
267 | module will be called stmp3xxx_wdt. | ||
268 | |||
260 | # AVR32 Architecture | 269 | # AVR32 Architecture |
261 | 270 | ||
262 | config AT32AP700X_WDT | 271 | config AT32AP700X_WDT |
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 2c54c04858b2..d437d5c2d22e 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile | |||
@@ -43,6 +43,7 @@ obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o | |||
43 | obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o | 43 | obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o |
44 | obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o | 44 | obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o |
45 | obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o | 45 | obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o |
46 | obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o | ||
46 | 47 | ||
47 | # AVR32 Architecture | 48 | # AVR32 Architecture |
48 | obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o | 49 | obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o |
diff --git a/drivers/watchdog/stmp3xxx_wdt.c b/drivers/watchdog/stmp3xxx_wdt.c new file mode 100644 index 000000000000..5dd952681f32 --- /dev/null +++ b/drivers/watchdog/stmp3xxx_wdt.c | |||
@@ -0,0 +1,296 @@ | |||
1 | /* | ||
2 | * Watchdog driver for Freescale STMP37XX/STMP378X | ||
3 | * | ||
4 | * Author: Vitaly Wool <vital@embeddedalley.com> | ||
5 | * | ||
6 | * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. | ||
7 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. | ||
8 | */ | ||
9 | #include <linux/init.h> | ||
10 | #include <linux/kernel.h> | ||
11 | #include <linux/fs.h> | ||
12 | #include <linux/miscdevice.h> | ||
13 | #include <linux/watchdog.h> | ||
14 | #include <linux/platform_device.h> | ||
15 | #include <linux/spinlock.h> | ||
16 | #include <linux/uaccess.h> | ||
17 | |||
18 | #include <mach/platform.h> | ||
19 | #include <mach/regs-rtc.h> | ||
20 | |||
21 | #define DEFAULT_HEARTBEAT 19 | ||
22 | #define MAX_HEARTBEAT (0x10000000 >> 6) | ||
23 | |||
24 | /* missing bitmask in headers */ | ||
25 | #define BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER 0x80000000 | ||
26 | |||
27 | #define WDT_IN_USE 0 | ||
28 | #define WDT_OK_TO_CLOSE 1 | ||
29 | |||
30 | #define WDOG_COUNTER_RATE 1000 /* 1 kHz clock */ | ||
31 | |||
32 | static DEFINE_SPINLOCK(stmp3xxx_wdt_io_lock); | ||
33 | static unsigned long wdt_status; | ||
34 | static const int nowayout = WATCHDOG_NOWAYOUT; | ||
35 | static int heartbeat = DEFAULT_HEARTBEAT; | ||
36 | static unsigned long boot_status; | ||
37 | |||
38 | static void wdt_enable(u32 value) | ||
39 | { | ||
40 | spin_lock(&stmp3xxx_wdt_io_lock); | ||
41 | __raw_writel(value, REGS_RTC_BASE + HW_RTC_WATCHDOG); | ||
42 | stmp3xxx_setl(BM_RTC_CTRL_WATCHDOGEN, REGS_RTC_BASE + HW_RTC_CTRL); | ||
43 | stmp3xxx_setl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER, | ||
44 | REGS_RTC_BASE + HW_RTC_PERSISTENT1); | ||
45 | spin_unlock(&stmp3xxx_wdt_io_lock); | ||
46 | } | ||
47 | |||
48 | static void wdt_disable(void) | ||
49 | { | ||
50 | spin_lock(&stmp3xxx_wdt_io_lock); | ||
51 | stmp3xxx_clearl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER, | ||
52 | REGS_RTC_BASE + HW_RTC_PERSISTENT1); | ||
53 | stmp3xxx_clearl(BM_RTC_CTRL_WATCHDOGEN, REGS_RTC_BASE + HW_RTC_CTRL); | ||
54 | spin_unlock(&stmp3xxx_wdt_io_lock); | ||
55 | } | ||
56 | |||
57 | static void wdt_ping(void) | ||
58 | { | ||
59 | wdt_enable(heartbeat * WDOG_COUNTER_RATE); | ||
60 | } | ||
61 | |||
62 | static int stmp3xxx_wdt_open(struct inode *inode, struct file *file) | ||
63 | { | ||
64 | if (test_and_set_bit(WDT_IN_USE, &wdt_status)) | ||
65 | return -EBUSY; | ||
66 | |||
67 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); | ||
68 | wdt_ping(); | ||
69 | |||
70 | return nonseekable_open(inode, file); | ||
71 | } | ||
72 | |||
73 | static ssize_t stmp3xxx_wdt_write(struct file *file, const char __user *data, | ||
74 | size_t len, loff_t *ppos) | ||
75 | { | ||
76 | if (len) { | ||
77 | if (!nowayout) { | ||
78 | size_t i; | ||
79 | |||
80 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); | ||
81 | |||
82 | for (i = 0; i != len; i++) { | ||
83 | char c; | ||
84 | |||
85 | if (get_user(c, data + i)) | ||
86 | return -EFAULT; | ||
87 | if (c == 'V') | ||
88 | set_bit(WDT_OK_TO_CLOSE, &wdt_status); | ||
89 | } | ||
90 | } | ||
91 | wdt_ping(); | ||
92 | } | ||
93 | |||
94 | return len; | ||
95 | } | ||
96 | |||
97 | static struct watchdog_info ident = { | ||
98 | .options = WDIOF_CARDRESET | | ||
99 | WDIOF_MAGICCLOSE | | ||
100 | WDIOF_SETTIMEOUT | | ||
101 | WDIOF_KEEPALIVEPING, | ||
102 | .identity = "STMP3XXX Watchdog", | ||
103 | }; | ||
104 | |||
105 | static long stmp3xxx_wdt_ioctl(struct file *file, unsigned int cmd, | ||
106 | unsigned long arg) | ||
107 | { | ||
108 | void __user *argp = (void __user *)arg; | ||
109 | int __user *p = argp; | ||
110 | int new_heartbeat, opts; | ||
111 | int ret = -ENOTTY; | ||
112 | |||
113 | switch (cmd) { | ||
114 | case WDIOC_GETSUPPORT: | ||
115 | ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; | ||
116 | break; | ||
117 | |||
118 | case WDIOC_GETSTATUS: | ||
119 | ret = put_user(0, p); | ||
120 | break; | ||
121 | |||
122 | case WDIOC_GETBOOTSTATUS: | ||
123 | ret = put_user(boot_status, p); | ||
124 | break; | ||
125 | |||
126 | case WDIOC_SETOPTIONS: | ||
127 | if (get_user(opts, p)) { | ||
128 | ret = -EFAULT; | ||
129 | break; | ||
130 | } | ||
131 | if (opts & WDIOS_DISABLECARD) | ||
132 | wdt_disable(); | ||
133 | else if (opts & WDIOS_ENABLECARD) | ||
134 | wdt_ping(); | ||
135 | else { | ||
136 | pr_debug("%s: unknown option 0x%x\n", __func__, opts); | ||
137 | ret = -EINVAL; | ||
138 | break; | ||
139 | } | ||
140 | ret = 0; | ||
141 | break; | ||
142 | |||
143 | case WDIOC_KEEPALIVE: | ||
144 | wdt_ping(); | ||
145 | ret = 0; | ||
146 | break; | ||
147 | |||
148 | case WDIOC_SETTIMEOUT: | ||
149 | if (get_user(new_heartbeat, p)) { | ||
150 | ret = -EFAULT; | ||
151 | break; | ||
152 | } | ||
153 | if (new_heartbeat <= 0 || new_heartbeat > MAX_HEARTBEAT) { | ||
154 | ret = -EINVAL; | ||
155 | break; | ||
156 | } | ||
157 | |||
158 | heartbeat = new_heartbeat; | ||
159 | wdt_ping(); | ||
160 | /* Fall through */ | ||
161 | |||
162 | case WDIOC_GETTIMEOUT: | ||
163 | ret = put_user(heartbeat, p); | ||
164 | break; | ||
165 | } | ||
166 | return ret; | ||
167 | } | ||
168 | |||
169 | static int stmp3xxx_wdt_release(struct inode *inode, struct file *file) | ||
170 | { | ||
171 | int ret = 0; | ||
172 | |||
173 | if (!nowayout) { | ||
174 | if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status)) { | ||
175 | wdt_ping(); | ||
176 | pr_debug("%s: Device closed unexpectdly\n", __func__); | ||
177 | ret = -EINVAL; | ||
178 | } else { | ||
179 | wdt_disable(); | ||
180 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); | ||
181 | } | ||
182 | } | ||
183 | clear_bit(WDT_IN_USE, &wdt_status); | ||
184 | |||
185 | return ret; | ||
186 | } | ||
187 | |||
188 | static const struct file_operations stmp3xxx_wdt_fops = { | ||
189 | .owner = THIS_MODULE, | ||
190 | .llseek = no_llseek, | ||
191 | .write = stmp3xxx_wdt_write, | ||
192 | .unlocked_ioctl = stmp3xxx_wdt_ioctl, | ||
193 | .open = stmp3xxx_wdt_open, | ||
194 | .release = stmp3xxx_wdt_release, | ||
195 | }; | ||
196 | |||
197 | static struct miscdevice stmp3xxx_wdt_miscdev = { | ||
198 | .minor = WATCHDOG_MINOR, | ||
199 | .name = "watchdog", | ||
200 | .fops = &stmp3xxx_wdt_fops, | ||
201 | }; | ||
202 | |||
203 | static int __devinit stmp3xxx_wdt_probe(struct platform_device *pdev) | ||
204 | { | ||
205 | int ret = 0; | ||
206 | |||
207 | if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT) | ||
208 | heartbeat = DEFAULT_HEARTBEAT; | ||
209 | |||
210 | boot_status = __raw_readl(REGS_RTC_BASE + HW_RTC_PERSISTENT1) & | ||
211 | BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER; | ||
212 | boot_status = !!boot_status; | ||
213 | stmp3xxx_clearl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER, | ||
214 | REGS_RTC_BASE + HW_RTC_PERSISTENT1); | ||
215 | wdt_disable(); /* disable for now */ | ||
216 | |||
217 | ret = misc_register(&stmp3xxx_wdt_miscdev); | ||
218 | if (ret < 0) { | ||
219 | dev_err(&pdev->dev, "cannot register misc device\n"); | ||
220 | return ret; | ||
221 | } | ||
222 | |||
223 | printk(KERN_INFO "stmp3xxx watchdog: initialized, heartbeat %d sec\n", | ||
224 | heartbeat); | ||
225 | |||
226 | return ret; | ||
227 | } | ||
228 | |||
229 | static int __devexit stmp3xxx_wdt_remove(struct platform_device *pdev) | ||
230 | { | ||
231 | misc_deregister(&stmp3xxx_wdt_miscdev); | ||
232 | return 0; | ||
233 | } | ||
234 | |||
235 | #ifdef CONFIG_PM | ||
236 | static int wdt_suspended; | ||
237 | static u32 wdt_saved_time; | ||
238 | |||
239 | static int stmp3xxx_wdt_suspend(struct platform_device *pdev, | ||
240 | pm_message_t state) | ||
241 | { | ||
242 | if (__raw_readl(REGS_RTC_BASE + HW_RTC_CTRL) & | ||
243 | BM_RTC_CTRL_WATCHDOGEN) { | ||
244 | wdt_suspended = 1; | ||
245 | wdt_saved_time = __raw_readl(REGS_RTC_BASE + HW_RTC_WATCHDOG); | ||
246 | wdt_disable(); | ||
247 | } | ||
248 | return 0; | ||
249 | } | ||
250 | |||
251 | static int stmp3xxx_wdt_resume(struct platform_device *pdev) | ||
252 | { | ||
253 | if (wdt_suspended) { | ||
254 | wdt_enable(wdt_saved_time); | ||
255 | wdt_suspended = 0; | ||
256 | } | ||
257 | return 0; | ||
258 | } | ||
259 | #else | ||
260 | #define stmp3xxx_wdt_suspend NULL | ||
261 | #define stmp3xxx_wdt_resume NULL | ||
262 | #endif | ||
263 | |||
264 | static struct platform_driver platform_wdt_driver = { | ||
265 | .driver = { | ||
266 | .name = "stmp3xxx_wdt", | ||
267 | }, | ||
268 | .probe = stmp3xxx_wdt_probe, | ||
269 | .remove = __devexit_p(stmp3xxx_wdt_remove), | ||
270 | .suspend = stmp3xxx_wdt_suspend, | ||
271 | .resume = stmp3xxx_wdt_resume, | ||
272 | }; | ||
273 | |||
274 | static int __init stmp3xxx_wdt_init(void) | ||
275 | { | ||
276 | return platform_driver_register(&platform_wdt_driver); | ||
277 | } | ||
278 | |||
279 | static void __exit stmp3xxx_wdt_exit(void) | ||
280 | { | ||
281 | return platform_driver_unregister(&platform_wdt_driver); | ||
282 | } | ||
283 | |||
284 | module_init(stmp3xxx_wdt_init); | ||
285 | module_exit(stmp3xxx_wdt_exit); | ||
286 | |||
287 | MODULE_DESCRIPTION("STMP3XXX Watchdog Driver"); | ||
288 | MODULE_LICENSE("GPL"); | ||
289 | |||
290 | module_param(heartbeat, int, 0); | ||
291 | MODULE_PARM_DESC(heartbeat, | ||
292 | "Watchdog heartbeat period in seconds from 1 to " | ||
293 | __MODULE_STRING(MAX_HEARTBEAT) ", default " | ||
294 | __MODULE_STRING(DEFAULT_HEARTBEAT)); | ||
295 | |||
296 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | ||