at91sam9_wdt.c (6ad390a25a9d1d8606b9b826878f0a30639dc2b3) at91sam9_wdt.c (c1c30a29df7e47310caa979dc48f715ae478de5f)
1/*
2 * Watchdog driver for Atmel AT91SAM9x processors.
3 *
4 * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version

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30#include <linux/timer.h>
31#include <linux/bitops.h>
32#include <linux/uaccess.h>
33
34#include "at91sam9_wdt.h"
35
36#define DRV_NAME "AT91SAM9 Watchdog"
37
1/*
2 * Watchdog driver for Atmel AT91SAM9x processors.
3 *
4 * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version

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30#include <linux/timer.h>
31#include <linux/bitops.h>
32#include <linux/uaccess.h>
33
34#include "at91sam9_wdt.h"
35
36#define DRV_NAME "AT91SAM9 Watchdog"
37
38#define wdt_read(field) \
39 __raw_readl(at91wdt_private.base + field)
40#define wdt_write(field, val) \
41 __raw_writel((val), at91wdt_private.base + field)
42
38/* AT91SAM9 watchdog runs a 12bit counter @ 256Hz,
39 * use this to convert a watchdog
40 * value from/to milliseconds.
41 */
42#define ms_to_ticks(t) (((t << 8) / 1000) - 1)
43#define ticks_to_ms(t) (((t + 1) * 1000) >> 8)
44
45/* Hardware timeout in seconds */

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58static int nowayout = WATCHDOG_NOWAYOUT;
59module_param(nowayout, int, 0);
60MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
61 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
62
63static void at91_ping(unsigned long data);
64
65static struct {
43/* AT91SAM9 watchdog runs a 12bit counter @ 256Hz,
44 * use this to convert a watchdog
45 * value from/to milliseconds.
46 */
47#define ms_to_ticks(t) (((t << 8) / 1000) - 1)
48#define ticks_to_ms(t) (((t + 1) * 1000) >> 8)
49
50/* Hardware timeout in seconds */

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63static int nowayout = WATCHDOG_NOWAYOUT;
64module_param(nowayout, int, 0);
65MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
66 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
67
68static void at91_ping(unsigned long data);
69
70static struct {
71 void __iomem *base;
66 unsigned long next_heartbeat; /* the next_heartbeat for the timer */
67 unsigned long open;
68 char expect_close;
69 struct timer_list timer; /* The timer that pings the watchdog */
70} at91wdt_private;
71
72/* ......................................................................... */
73
74
75/*
76 * Reload the watchdog timer. (ie, pat the watchdog)
77 */
78static inline void at91_wdt_reset(void)
79{
72 unsigned long next_heartbeat; /* the next_heartbeat for the timer */
73 unsigned long open;
74 char expect_close;
75 struct timer_list timer; /* The timer that pings the watchdog */
76} at91wdt_private;
77
78/* ......................................................................... */
79
80
81/*
82 * Reload the watchdog timer. (ie, pat the watchdog)
83 */
84static inline void at91_wdt_reset(void)
85{
80 at91_sys_write(AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
86 wdt_write(AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
81}
82
83/*
84 * Timer tick
85 */
86static void at91_ping(unsigned long data)
87{
88 if (time_before(jiffies, at91wdt_private.next_heartbeat) ||

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127 * Counter is 12 bit.
128 */
129static int at91_wdt_settimeout(unsigned int timeout)
130{
131 unsigned int reg;
132 unsigned int mr;
133
134 /* Check if disabled */
87}
88
89/*
90 * Timer tick
91 */
92static void at91_ping(unsigned long data)
93{
94 if (time_before(jiffies, at91wdt_private.next_heartbeat) ||

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133 * Counter is 12 bit.
134 */
135static int at91_wdt_settimeout(unsigned int timeout)
136{
137 unsigned int reg;
138 unsigned int mr;
139
140 /* Check if disabled */
135 mr = at91_sys_read(AT91_WDT_MR);
141 mr = wdt_read(AT91_WDT_MR);
136 if (mr & AT91_WDT_WDDIS) {
137 printk(KERN_ERR DRV_NAME": sorry, watchdog is disabled\n");
138 return -EIO;
139 }
140
141 /*
142 * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
143 *
144 * Since WDV is a 12-bit counter, the maximum period is
145 * 4096 / 256 = 16 seconds.
146 */
147 reg = AT91_WDT_WDRSTEN /* causes watchdog reset */
148 /* | AT91_WDT_WDRPROC causes processor reset only */
149 | AT91_WDT_WDDBGHLT /* disabled in debug mode */
150 | AT91_WDT_WDD /* restart at any time */
151 | (timeout & AT91_WDT_WDV); /* timer value */
142 if (mr & AT91_WDT_WDDIS) {
143 printk(KERN_ERR DRV_NAME": sorry, watchdog is disabled\n");
144 return -EIO;
145 }
146
147 /*
148 * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
149 *
150 * Since WDV is a 12-bit counter, the maximum period is
151 * 4096 / 256 = 16 seconds.
152 */
153 reg = AT91_WDT_WDRSTEN /* causes watchdog reset */
154 /* | AT91_WDT_WDRPROC causes processor reset only */
155 | AT91_WDT_WDDBGHLT /* disabled in debug mode */
156 | AT91_WDT_WDD /* restart at any time */
157 | (timeout & AT91_WDT_WDV); /* timer value */
152 at91_sys_write(AT91_WDT_MR, reg);
158 wdt_write(AT91_WDT_MR, reg);
153
154 return 0;
155}
156
157static const struct watchdog_info at91_wdt_info = {
158 .identity = DRV_NAME,
159 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
160 WDIOF_MAGICCLOSE,

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243static struct miscdevice at91wdt_miscdev = {
244 .minor = WATCHDOG_MINOR,
245 .name = "watchdog",
246 .fops = &at91wdt_fops,
247};
248
249static int __init at91wdt_probe(struct platform_device *pdev)
250{
159
160 return 0;
161}
162
163static const struct watchdog_info at91_wdt_info = {
164 .identity = DRV_NAME,
165 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
166 WDIOF_MAGICCLOSE,

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249static struct miscdevice at91wdt_miscdev = {
250 .minor = WATCHDOG_MINOR,
251 .name = "watchdog",
252 .fops = &at91wdt_fops,
253};
254
255static int __init at91wdt_probe(struct platform_device *pdev)
256{
257 struct resource *r;
251 int res;
252
253 if (at91wdt_miscdev.parent)
254 return -EBUSY;
255 at91wdt_miscdev.parent = &pdev->dev;
256
258 int res;
259
260 if (at91wdt_miscdev.parent)
261 return -EBUSY;
262 at91wdt_miscdev.parent = &pdev->dev;
263
264 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
265 if (!r)
266 return -ENODEV;
267 at91wdt_private.base = ioremap(r->start, resource_size(r));
268 if (!at91wdt_private.base) {
269 dev_err(&pdev->dev, "failed to map registers, aborting.\n");
270 return -ENOMEM;
271 }
272
257 /* Set watchdog */
258 res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
259 if (res)
260 return res;
261
262 res = misc_register(&at91wdt_miscdev);
263 if (res)
264 return res;

--- 47 unchanged lines hidden --- 		273 /* Set watchdog */
274 res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
275 if (res)
276 return res;
277
278 res = misc_register(&at91wdt_miscdev);
279 if (res)
280 return res;

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