2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2006 infineon
17 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
21 #include <asm/uaccess.h>
22 #include <linux/errno.h>
23 #include <linux/proc_fs.h>
24 #include <linux/ioctl.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/watchdog.h>
28 #include <linux/miscdevice.h>
29 #include <asm-mips/ifxmips/ifxmips_wdt.h>
30 #include <asm-mips/ifxmips/ifxmips.h>
32 #define DRVNAME "ifxmips_wdt"
34 // TODO remove magic numbers and weirdo macros
35 extern unsigned int ifxmips_get_fpi_hz (void);
37 static int ifxmips_wdt_inuse = 0;
38 static int ifxmips_wdt_major = 0;
41 ifxmips_wdt_enable (unsigned int timeout)
43 unsigned int wdt_cr = 0;
44 unsigned int wdt_reload = 0;
45 unsigned int wdt_clkdiv, wdt_pwl, ffpi;
48 /* clock divider & prewarning limit */
49 wdt_clkdiv = 1 << (7 * IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR)));
50 wdt_pwl = 0x8000 >> IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_BIU_WDT_CR));
53 printk("WARNING FUNCTION CALL MISSING!!!");
54 //ffpi = cgu_get_io_region_clock();
55 printk("cpu clock = %d\n", ffpi);
57 /* caculate reload value */
58 wdt_reload = (timeout * (ffpi / wdt_clkdiv)) + wdt_pwl;
60 printk(KERN_WARNING DRVNAME ": wdt_pwl=0x%x, wdt_clkdiv=%d, ffpi=%d, wdt_reload = 0x%x\n",
61 wdt_pwl, wdt_clkdiv, ffpi, wdt_reload);
63 if (wdt_reload > 0xFFFF)
65 printk(KERN_WARNING DRVNAME ": timeout too large %d\n", timeout);
70 /* Write first part of password access */
71 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
73 wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
74 wdt_cr &= (!IFXMIPS_BIU_WDT_CR_PW_SET(0xff) &
75 !IFXMIPS_BIU_WDT_CR_PWL_SET(0x3) &
76 !IFXMIPS_BIU_WDT_CR_CLKDIV_SET(0x3) &
77 !IFXMIPS_BIU_WDT_CR_RELOAD_SET(0xffff));
79 wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) |
80 IFXMIPS_BIU_WDT_CR_PWL_SET(IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_BIU_WDT_CR))) |
81 IFXMIPS_BIU_WDT_CR_CLKDIV_SET(IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR))) |
82 IFXMIPS_BIU_WDT_CR_RELOAD_SET(wdt_reload) |
83 IFXMIPS_BIU_WDT_CR_GEN);
85 writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
87 printk("watchdog enabled\n");
94 ifxmips_wdt_disable (void)
96 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
97 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2), IFXMIPS_BIU_WDT_CR);
99 printk("watchdog disabled\n");
102 /* passed LPEN or DSEN */
104 ifxmips_wdt_enable_feature (int en, int type)
106 unsigned int wdt_cr = 0;
108 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
110 wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
114 wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff));
115 wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | type);
117 wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & ~type);
118 wdt_cr |= IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2);
121 writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
125 ifxmips_wdt_prewarning_limit (int pwl)
127 unsigned int wdt_cr = 0;
129 wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
130 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
132 wdt_cr &= 0xf300ffff;
133 wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_PWL_SET(pwl));
135 /* Set reload value in second password access */
136 writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
140 ifxmips_wdt_set_clkdiv (int clkdiv)
142 unsigned int wdt_cr = 0;
144 wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
145 writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
147 wdt_cr &= 0xfc00ffff;
148 wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_CLKDIV_SET(clkdiv));
150 /* Set reload value in second password access */
151 writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
155 ifxmips_wdt_ioctl (struct inode *inode, struct file *file, unsigned int cmd,
159 static int timeout = -1;
160 unsigned int user_arg;
162 if ((cmd != IFXMIPS_WDT_IOC_STOP) && (cmd != IFXMIPS_WDT_IOC_PING) && (cmd != IFXMIPS_WDT_IOC_GET_STATUS))
164 if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){
172 case IFXMIPS_WDT_IOC_START:
173 if ((result = ifxmips_wdt_enable(user_arg)) < 0)
179 case IFXMIPS_WDT_IOC_STOP:
180 printk(KERN_INFO DRVNAME ": disable watch dog timer\n");
181 ifxmips_wdt_disable();
184 case IFXMIPS_WDT_IOC_PING:
188 result = ifxmips_wdt_enable(timeout);
191 case IFXMIPS_WDT_IOC_GET_STATUS:
192 user_arg = readl(IFXMIPS_BIU_WDT_SR);
193 copy_to_user((int*)arg, (int*)&user_arg, sizeof(int));
196 case IFXMIPS_WDT_IOC_SET_PWL:
197 ifxmips_wdt_prewarning_limit(user_arg);
200 case IFXMIPS_WDT_IOC_SET_DSEN:
201 ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN);
204 case IFXMIPS_WDT_IOC_SET_LPEN:
205 ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN);
208 case IFXMIPS_WDT_IOC_SET_CLKDIV:
209 ifxmips_wdt_set_clkdiv(user_arg);
213 printk(KERN_WARNING DRVNAME ": unknown watchdog iotcl\n");
221 ifxmips_wdt_open (struct inode *inode, struct file *file)
223 if (ifxmips_wdt_inuse)
226 ifxmips_wdt_inuse = 1;
232 ifxmips_wdt_release (struct inode *inode, struct file *file)
234 ifxmips_wdt_inuse = 0;
240 ifxmips_wdt_register_proc_read (char *buf, char **start, off_t offset, int count,
241 int *eof, void *data)
245 len += sprintf (buf + len, "IFXMIPS_BIU_WDT_PROC_READ\n");
246 len += sprintf (buf + len, "IFXMIPS_BIU_WDT_CR(0x%08x) : 0x%08x\n",
247 (unsigned int)IFXMIPS_BIU_WDT_CR, readl(IFXMIPS_BIU_WDT_CR));
248 len += sprintf (buf + len, "IFXMIPS_BIU_WDT_SR(0x%08x) : 0x%08x\n",
249 (unsigned int)IFXMIPS_BIU_WDT_SR, readl(IFXMIPS_BIU_WDT_SR));
256 static const struct file_operations ifxmips_wdt_fops = {
257 .owner = THIS_MODULE,
259 .ioctl = ifxmips_wdt_ioctl,
260 .open = ifxmips_wdt_open,
261 .release = ifxmips_wdt_release,
262 // .write = at91_wdt_write,
265 static struct miscdevice ifxmips_wdt_miscdev = {
266 .minor = WATCHDOG_MINOR,
267 .name = "ifxmips_wdt",
268 .fops = &ifxmips_wdt_fops,
273 ifxmips_wdt_probe (struct platform_device *pdev)
275 int ret = misc_register(&ifxmips_wdt_miscdev);
279 create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_wdt_register_proc_read, NULL);
281 printk(KERN_INFO DRVNAME ": ifxmips watchdog loaded\n");
287 ifxmips_wdt_remove (struct platform_device *pdev)
289 misc_deregister(&ifxmips_wdt_miscdev);
290 remove_proc_entry(DRVNAME, NULL);
295 platform_driver ifxmips_wdt_driver = {
296 .probe = ifxmips_wdt_probe,
297 .remove = ifxmips_wdt_remove,
300 .owner = THIS_MODULE,
305 ifxmips_wdt_init_module (void)
307 int ret = platform_driver_register(&ifxmips_wdt_driver);
309 printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
314 ifxmips_wdt_cleanup_module (void)
316 platform_driver_unregister(&ifxmips_wdt_driver);
319 module_init(ifxmips_wdt_init_module);
320 module_exit(ifxmips_wdt_cleanup_module);
322 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
323 MODULE_DESCRIPTION("Watchdog driver for infineon ifxmips family");
324 MODULE_LICENSE("GPL");
325 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);