diff options
Diffstat (limited to 'target/linux/danube/files/drivers/char/watchdog/danube_wdt.c')
| -rw-r--r-- | target/linux/danube/files/drivers/char/watchdog/danube_wdt.c | 287 |
1 files changed, 0 insertions, 287 deletions
diff --git a/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c b/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c deleted file mode 100644 index be2b33938..000000000 --- a/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c +++ /dev/null @@ -1,287 +0,0 @@ -/* - * 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); |