diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers/watchdog')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c new file mode 100644 index 000000000..d631f4aac --- /dev/null +++ b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c @@ -0,0 +1,325 @@ +/* + * 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 <linux/platform_device.h> +#include <linux/watchdog.h> +#include <linux/miscdevice.h> +#include <asm-mips/ifxmips/ifxmips_wdt.h> +#include <asm-mips/ifxmips/ifxmips.h> + +#define DRVNAME "ifxmips_wdt" + +// TODO remove magic numbers and weirdo macros +extern unsigned int ifxmips_get_fpi_hz (void); + +static int ifxmips_wdt_inuse = 0; +static int ifxmips_wdt_major = 0; + +int +ifxmips_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 * IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR))); + wdt_pwl = 0x8000 >> IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_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(KERN_WARNING DRVNAME ": 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(KERN_WARNING DRVNAME ": timeout too large %d\n", timeout); + retval = -EINVAL; + goto out; + } + + /* Write first part of password access */ + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + + wdt_cr = readl(IFXMIPS_BIU_WDT_CR); + wdt_cr &= (!IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & + !IFXMIPS_BIU_WDT_CR_PWL_SET(0x3) & + !IFXMIPS_BIU_WDT_CR_CLKDIV_SET(0x3) & + !IFXMIPS_BIU_WDT_CR_RELOAD_SET(0xffff)); + + wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | + IFXMIPS_BIU_WDT_CR_PWL_SET(IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_BIU_WDT_CR))) | + IFXMIPS_BIU_WDT_CR_CLKDIV_SET(IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR))) | + IFXMIPS_BIU_WDT_CR_RELOAD_SET(wdt_reload) | + IFXMIPS_BIU_WDT_CR_GEN); + + writel(wdt_cr, IFXMIPS_BIU_WDT_CR); + + printk("watchdog enabled\n"); + +out: + return retval; +} + +void +ifxmips_wdt_disable (void) +{ + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2), IFXMIPS_BIU_WDT_CR); + + printk("watchdog disabled\n"); +} + +/* passed LPEN or DSEN */ +void +ifxmips_wdt_enable_feature (int en, int type) +{ + unsigned int wdt_cr = 0; + + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + + wdt_cr = readl(IFXMIPS_BIU_WDT_CR); + + if (en) + { + wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff)); + wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | type); + } else { + wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & ~type); + wdt_cr |= IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2); + } + + writel(wdt_cr, IFXMIPS_BIU_WDT_CR); +} + +void +ifxmips_wdt_prewarning_limit (int pwl) +{ + unsigned int wdt_cr = 0; + + wdt_cr = readl(IFXMIPS_BIU_WDT_CR); + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + + wdt_cr &= 0xf300ffff; + wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_PWL_SET(pwl)); + + /* Set reload value in second password access */ + writel(wdt_cr, IFXMIPS_BIU_WDT_CR); +} + +void +ifxmips_wdt_set_clkdiv (int clkdiv) +{ + unsigned int wdt_cr = 0; + + wdt_cr = readl(IFXMIPS_BIU_WDT_CR); + writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + + wdt_cr &= 0xfc00ffff; + wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_CLKDIV_SET(clkdiv)); + + /* Set reload value in second password access */ + writel(wdt_cr, IFXMIPS_BIU_WDT_CR); +} + +static int +ifxmips_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 != IFXMIPS_WDT_IOC_STOP) && (cmd != IFXMIPS_WDT_IOC_PING) && (cmd != IFXMIPS_WDT_IOC_GET_STATUS)) + { + if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){ + result = -EINVAL; + goto out; + } + } + + switch (cmd) + { + case IFXMIPS_WDT_IOC_START: + if ((result = ifxmips_wdt_enable(user_arg)) < 0) + timeout = -1; + else + timeout = user_arg; + break; + + case IFXMIPS_WDT_IOC_STOP: + printk(KERN_INFO DRVNAME ": disable watch dog timer\n"); + ifxmips_wdt_disable(); + break; + + case IFXMIPS_WDT_IOC_PING: + if (timeout < 0) + result = -EIO; + else + result = ifxmips_wdt_enable(timeout); + break; + + case IFXMIPS_WDT_IOC_GET_STATUS: + user_arg = readl(IFXMIPS_BIU_WDT_SR); + copy_to_user((int*)arg, (int*)&user_arg, sizeof(int)); + break; + + case IFXMIPS_WDT_IOC_SET_PWL: + ifxmips_wdt_prewarning_limit(user_arg); + break; + + case IFXMIPS_WDT_IOC_SET_DSEN: + ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN); + break; + + case IFXMIPS_WDT_IOC_SET_LPEN: + ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN); + break; + + case IFXMIPS_WDT_IOC_SET_CLKDIV: + ifxmips_wdt_set_clkdiv(user_arg); + break; + + default: + printk(KERN_WARNING DRVNAME ": unknown watchdog iotcl\n"); + } + +out: + return result; +} + +static int +ifxmips_wdt_open (struct inode *inode, struct file *file) +{ + if (ifxmips_wdt_inuse) + return -EBUSY; + + ifxmips_wdt_inuse = 1; + + return 0; +} + +static int +ifxmips_wdt_release (struct inode *inode, struct file *file) +{ + ifxmips_wdt_inuse = 0; + + return 0; +} + +int +ifxmips_wdt_register_proc_read (char *buf, char **start, off_t offset, int count, + int *eof, void *data) +{ + int len = 0; + + len += sprintf (buf + len, "IFXMIPS_BIU_WDT_PROC_READ\n"); + len += sprintf (buf + len, "IFXMIPS_BIU_WDT_CR(0x%08x) : 0x%08x\n", + (unsigned int)IFXMIPS_BIU_WDT_CR, readl(IFXMIPS_BIU_WDT_CR)); + len += sprintf (buf + len, "IFXMIPS_BIU_WDT_SR(0x%08x) : 0x%08x\n", + (unsigned int)IFXMIPS_BIU_WDT_SR, readl(IFXMIPS_BIU_WDT_SR)); + + *eof = 1; + + return len; +} + +static const struct file_operations ifxmips_wdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .ioctl = ifxmips_wdt_ioctl, + .open = ifxmips_wdt_open, + .release = ifxmips_wdt_release, +// .write = at91_wdt_write, +}; + +static struct miscdevice ifxmips_wdt_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "ifxmips_wdt", + .fops = &ifxmips_wdt_fops, +}; + + +static int +ifxmips_wdt_probe (struct platform_device *pdev) +{ + int ret = misc_register(&ifxmips_wdt_miscdev); + if (ret) + return ret; + + create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_wdt_register_proc_read, NULL); + + printk(KERN_INFO DRVNAME ": ifxmips watchdog loaded\n"); + + return 0; +} + +static int +ifxmips_wdt_remove (struct platform_device *pdev) +{ + misc_deregister(&ifxmips_wdt_miscdev); + remove_proc_entry(DRVNAME, NULL); + return 0; +} + +static struct +platform_driver ifxmips_wdt_driver = { + .probe = ifxmips_wdt_probe, + .remove = ifxmips_wdt_remove, + .driver = { + .name = DRVNAME, + .owner = THIS_MODULE, + }, +}; + +int __init +ifxmips_wdt_init_module (void) +{ + int ret = platform_driver_register(&ifxmips_wdt_driver); + if (ret) + printk(KERN_INFO DRVNAME ": Error registering platfom driver!"); + return ret; +} + +void +ifxmips_wdt_cleanup_module (void) +{ + platform_driver_unregister(&ifxmips_wdt_driver); +} + +module_init(ifxmips_wdt_init_module); +module_exit(ifxmips_wdt_cleanup_module); + +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); +MODULE_DESCRIPTION("Watchdog driver for infineon ifxmips family"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |