diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers/char/watchdog')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c b/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c new file mode 100644 index 000000000..be2b33938 --- /dev/null +++ b/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c @@ -0,0 +1,287 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) 2006 infineon + * Copyright (C) 2007 John Crispin <blogic@openwrt.org> + * + */ + +#include <asm/uaccess.h> +#include <linux/errno.h> +#include <linux/proc_fs.h> +#include <linux/ioctl.h> +#include <linux/module.h> +#include <asm-mips/danube/danube_wdt.h> +#include <asm-mips/danube/danube.h> + + +// TODO remove magic numbers and weirdo macros + +extern unsigned int danube_get_fpi_hz (void); + +static int danube_wdt_inuse = 0; +static int danube_wdt_major = 0; + +int +danube_wdt_enable (unsigned int timeout) +{ + unsigned int wdt_cr = 0; + unsigned int wdt_reload = 0; + unsigned int wdt_clkdiv, wdt_pwl, ffpi; + int retval = 0; + + /* clock divider & prewarning limit */ + wdt_clkdiv = 1 << (7 * DANUBE_BIU_WDT_CR_CLKDIV_GET(readl(DANUBE_BIU_WDT_CR))); + wdt_pwl = 0x8000 >> DANUBE_BIU_WDT_CR_PWL_GET(readl(DANUBE_BIU_WDT_CR)); + + //TODO + printk("WARNING FUNCTION CALL MISSING!!!"); + //ffpi = cgu_get_io_region_clock(); + printk("cpu clock = %d\n", ffpi); + + /* caculate reload value */ + wdt_reload = (timeout * (ffpi / wdt_clkdiv)) + wdt_pwl; + + printk("wdt_pwl=0x%x, wdt_clkdiv=%d, ffpi=%d, wdt_reload = 0x%x\n", + wdt_pwl, wdt_clkdiv, ffpi, wdt_reload); + + if (wdt_reload > 0xFFFF) + { + printk ("timeout too large %d\n", timeout); + retval = -EINVAL; + goto out; + } + + /* Write first part of password access */ + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR); + + wdt_cr = readl(DANUBE_BIU_WDT_CR); + wdt_cr &= (!DANUBE_BIU_WDT_CR_PW_SET(0xff) & + !DANUBE_BIU_WDT_CR_PWL_SET(0x3) & + !DANUBE_BIU_WDT_CR_CLKDIV_SET(0x3) & + !DANUBE_BIU_WDT_CR_RELOAD_SET(0xffff)); + + wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | + DANUBE_BIU_WDT_CR_PWL_SET(DANUBE_BIU_WDT_CR_PWL_GET(readl(DANUBE_BIU_WDT_CR))) | + DANUBE_BIU_WDT_CR_CLKDIV_SET(DANUBE_BIU_WDT_CR_CLKDIV_GET(readl(DANUBE_BIU_WDT_CR))) | + DANUBE_BIU_WDT_CR_RELOAD_SET(wdt_reload) | + DANUBE_BIU_WDT_CR_GEN); + + writel(wdt_cr, DANUBE_BIU_WDT_CR); + + printk("watchdog enabled\n"); + +out: + return retval; +} + +void +danube_wdt_disable (void) +{ + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR); + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2), DANUBE_BIU_WDT_CR); + + printk("watchdog disabled\n"); +} + +/* passed LPEN or DSEN */ +void +danube_wdt_enable_feature (int en, int type) +{ + unsigned int wdt_cr = 0; + + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR); + + wdt_cr = readl(DANUBE_BIU_WDT_CR); + + if (en) + { + wdt_cr &= (~DANUBE_BIU_WDT_CR_PW_SET(0xff)); + wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | type); + } else { + wdt_cr &= (~DANUBE_BIU_WDT_CR_PW_SET(0xff) & ~type); + wdt_cr |= DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2); + } + + writel(wdt_cr, DANUBE_BIU_WDT_CR); +} + +void +danube_wdt_prewarning_limit (int pwl) +{ + unsigned int wdt_cr = 0; + + wdt_cr = readl(DANUBE_BIU_WDT_CR); + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR); + + wdt_cr &= 0xf300ffff; + wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | DANUBE_BIU_WDT_CR_PWL_SET(pwl)); + + /* Set reload value in second password access */ + writel(wdt_cr, DANUBE_BIU_WDT_CR); +} + +void +danube_wdt_set_clkdiv (int clkdiv) +{ + unsigned int wdt_cr = 0; + + wdt_cr = readl(DANUBE_BIU_WDT_CR); + writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR); + + wdt_cr &= 0xfc00ffff; + wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | DANUBE_BIU_WDT_CR_CLKDIV_SET(clkdiv)); + + /* Set reload value in second password access */ + writel(wdt_cr, DANUBE_BIU_WDT_CR); +} + +static int +danube_wdt_ioctl (struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg) +{ + int result = 0; + static int timeout = -1; + unsigned int user_arg; + + if ((cmd != DANUBE_WDT_IOC_STOP) && (cmd != DANUBE_WDT_IOC_PING) && (cmd != DANUBE_WDT_IOC_GET_STATUS)) + { + if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){ + result = -EINVAL; + goto out; + } + } + + switch (cmd) + { + case DANUBE_WDT_IOC_START: + if ((result = danube_wdt_enable(user_arg)) < 0) + timeout = -1; + else + timeout = user_arg; + break; + + case DANUBE_WDT_IOC_STOP: + printk("disable watch dog timer\n"); + danube_wdt_disable(); + break; + + case DANUBE_WDT_IOC_PING: + if (timeout < 0) + result = -EIO; + else + result = danube_wdt_enable(timeout); + break; + + case DANUBE_WDT_IOC_GET_STATUS: + user_arg = readl(DANUBE_BIU_WDT_SR); + copy_to_user((int*)arg, (int*)&user_arg, sizeof(int)); + break; + + case DANUBE_WDT_IOC_SET_PWL: + danube_wdt_prewarning_limit(user_arg); + break; + + case DANUBE_WDT_IOC_SET_DSEN: + danube_wdt_enable_feature(user_arg, DANUBE_BIU_WDT_CR_DSEN); + break; + + case DANUBE_WDT_IOC_SET_LPEN: + danube_wdt_enable_feature(user_arg, DANUBE_BIU_WDT_CR_LPEN); + break; + + case DANUBE_WDT_IOC_SET_CLKDIV: + danube_wdt_set_clkdiv(user_arg); + break; + + default: + printk("unknown watchdog iotcl\n"); + } + +out: + return result; +} + +static int +danube_wdt_open (struct inode *inode, struct file *file) +{ + if (danube_wdt_inuse) + return -EBUSY; + + danube_wdt_inuse = 1; + + return 0; +} + +static int +danube_wdt_release (struct inode *inode, struct file *file) +{ + danube_wdt_inuse = 0; + + return 0; +} + +int +danube_wdt_register_proc_read (char *buf, char **start, off_t offset, int count, + int *eof, void *data) +{ + int len = 0; + + len += sprintf (buf + len, "DANUBE_BIU_WDT_PROC_READ\n"); + len += sprintf (buf + len, "DANUBE_BIU_WDT_CR(0x%08x) : 0x%08x\n", + (unsigned int)DANUBE_BIU_WDT_CR, readl(DANUBE_BIU_WDT_CR)); + len += sprintf (buf + len, "DANUBE_BIU_WDT_SR(0x%08x) : 0x%08x\n", + (unsigned int)DANUBE_BIU_WDT_SR, readl(DANUBE_BIU_WDT_SR)); + + *eof = 1; + + return len; +} + +static struct file_operations wdt_fops = { + .owner = THIS_MODULE, + .ioctl = danube_wdt_ioctl, + .open = danube_wdt_open, + .release = danube_wdt_release, +}; + +int __init +danube_wdt_init_module (void) +{ + danube_wdt_major = register_chrdev(0, "wdt", &wdt_fops); + + if (danube_wdt_major < 0) + { + printk("cannot register watchdog device\n"); + + return -EINVAL; + } + + create_proc_read_entry("danube_wdt", 0, NULL, danube_wdt_register_proc_read, NULL); + + printk("danube watchdog loaded\n"); + + return 0; +} + +void +danube_wdt_cleanup_module (void) +{ + unregister_chrdev(danube_wdt_major, "wdt"); + remove_proc_entry("danube_wdt", NULL); +} + +module_init(danube_wdt_init_module); +module_exit(danube_wdt_cleanup_module); |