On Wed, Apr 10, 2013 at 09:47:17AM -0700, Guenter Roeck wrote: > On Mon, Apr 08, 2013 at 10:15:21AM -0700, Kevin Strasser wrote: > > From: Michael Brunner <[email protected]> > > > > Add watchdog timer support for the on-board PLD found on some Kontron > > embedded modules. > > > > Signed-off-by: Michael Brunner <[email protected]> > > Signed-off-by: Kevin Strasser <[email protected]> > > Personally I would prefer two separate patches for the two drivers, > and to have the drivers converted to the watchdog infrastructure. > Wim's call, of course. > Thanks for the feedback. I'm happy to do both if Wim thinks it's necessary.
-Kevin > Thanks, > Guenter > > > --- > > drivers/watchdog/Kconfig | 20 + > > drivers/watchdog/Makefile | 2 + > > drivers/watchdog/kempld_now1_wdt.c | 602 +++++++++++++++++++++++++++ > > drivers/watchdog/kempld_wdt.c | 796 > > ++++++++++++++++++++++++++++++++++++ > > drivers/watchdog/kempld_wdt.h | 75 ++++ > > 5 files changed, 1495 insertions(+) > > create mode 100644 drivers/watchdog/kempld_now1_wdt.c > > create mode 100644 drivers/watchdog/kempld_wdt.c > > create mode 100644 drivers/watchdog/kempld_wdt.h > > > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > > index 9fcc70c..9ac71ca 100644 > > --- a/drivers/watchdog/Kconfig > > +++ b/drivers/watchdog/Kconfig > > @@ -687,6 +687,26 @@ config HP_WATCHDOG > > To compile this driver as a module, choose M here: the module will be > > called hpwdt. > > > > +config KEMPLD_WDT > > + tristate "Kontron COM watchdog" > > + depends on MFD_KEMPLD > > + help > > + Support for the PLD watchdog on some Kontron ETX and COMexpress > > + (ETXexpress) modules > > + > > + This driver can also be built as a module. If so, the module will be > > + called kempld_wdt. > > + > > +config KEMPLD_NOW1_WDT > > + tristate "Kontron COMe-mSP1 (nanoETXexpress-SP) watchdog" > > + depends on MFD_KEMPLD > > + help > > + Support for the PLD watchdog on the Kontron COMe-mSP1 > > + (nanoETXexpress-SP) module. > > + > > + This driver can also be built as a module. If so, the module will > > + be called kempld_now1_wdt. > > + > > config HPWDT_NMI_DECODING > > bool "NMI decoding support for the HP ProLiant iLO2+ Hardware Watchdog > > Timer" > > depends on HP_WATCHDOG > > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > > index a300b94..a029930 100644 > > --- a/drivers/watchdog/Makefile > > +++ b/drivers/watchdog/Makefile > > @@ -90,6 +90,8 @@ endif > > obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o > > obj-$(CONFIG_IT87_WDT) += it87_wdt.o > > obj-$(CONFIG_HP_WATCHDOG) += hpwdt.o > > +obj-$(CONFIG_KEMPLD_WDT) += kempld_wdt.o > > +obj-$(COnFIG_KEMPLD_NOW1_WDT) += kempld_now1_wdt.o > > obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o > > obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o > > obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o > > diff --git a/drivers/watchdog/kempld_now1_wdt.c > > b/drivers/watchdog/kempld_now1_wdt.c > > new file mode 100644 > > index 0000000..19b7272 > > --- /dev/null > > +++ b/drivers/watchdog/kempld_now1_wdt.c > > @@ -0,0 +1,602 @@ > > +/* > > + * kempld_now1_wdt.c - Kontron PLD watchdog driver for COMe-mSP1 > > + * > > + * Copyright (c) 2011-2012 Kontron Europe GmbH > > + * Author: Michael Brunner <[email protected]> > > + * > > + * Note: The watchdog of the COMe-mSP1 (nanoETXexpress-SP) has one stage > > and > > + * only supports predefined watchdog timeout values. > > + * > > + * The supported timeouts are: > > + * 1 s, 5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License 2 as published > > + * by the Free Software Foundation. > > + * > > + * 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; see the file COPYING. If not, write to > > + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. > > + */ > > + > > +#include <linux/module.h> > > +#include <linux/moduleparam.h> > > +#include <linux/types.h> > > +#include <linux/miscdevice.h> > > +#include <linux/watchdog.h> > > +#include <linux/fs.h> > > +#include <linux/ioport.h> > > +#include <linux/init.h> > > +#include <linux/uaccess.h> > > +#include <linux/slab.h> > > +#include <linux/delay.h> > > +#include <linux/platform_device.h> > > +#include <linux/mfd/kempld.h> > > + > > +#include "kempld_wdt.h" > > + > > +#define WATCHDOG_TIMEOUT 30 > > +static int timeout = WATCHDOG_TIMEOUT; > > +module_param(timeout, int, 0); > > +MODULE_PARM_DESC(timeout, > > + "Watchdog timeout in seconds. (1, 5, 10, 30, 60, 300, 600, " > > + "900, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); > > + > > +static bool nowayout = WATCHDOG_NOWAYOUT; > > +module_param(nowayout, bool, 0); > > +MODULE_PARM_DESC(nowayout, > > + "Watchdog cannot be stopped once started (default=" > > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > > + > > +/* nanoETXexpress-SP watchdog register definitions */ > > +#define KEMPLD_WDT_NOW1 0xA2 > > +#define KEMPLD_WDT_NOW1_KICK_MASK 0x80 > > +#define KEMPLD_WDT_NOW1_ENABLE_MASK 0x40 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_MASK 0x1f > > +#define KEMPLD_WDT_NOW1_TIMEOUT_1SEC 0x00 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_5SEC 0x01 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_10SEC 0x02 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_30SEC 0x03 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_1MIN 0x10 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_5MIN 0x11 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_10MIN 0x12 > > +#define KEMPLD_WDT_NOW1_TIMEOUT_15MIN 0x13 > > + > > +/* delay in us necessary due to clock domain sync */ > > +#define KEMPLD_WDT_NOW1_SYNC_DELAY 31 > > + > > +static struct kempld_watchdog_data *kempld_now1_wdt; > > + > > +static int kempld_now1_wdt_read_supported; > > +static int kempld_now1_wdt_reg_cache; > > + > > +static int kempld_now1_wdt_start(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int wdt_reg; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + if (kempld_now1_wdt_read_supported) > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + else > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + wdt_reg |= KEMPLD_WDT_NOW1_ENABLE_MASK; > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + kempld_write8(pld, KEMPLD_WDT_NOW1, wdt_reg); > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + kempld_release_mutex(pld); > > + > > + if (kempld_now1_wdt_read_supported) { > > + /* read out the register again to check if everything worked */ > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + kempld_release_mutex(pld); > > + > > + /* check if the watchdog was disabled */ > > + if (!(wdt_reg & KEMPLD_WDT_NOW1_ENABLE_MASK)) > > + return -EACCES; > > + } > > + > > + return 0; > > +} > > + > > +static int kempld_now1_wdt_stop(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int wdt_reg; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + if (kempld_now1_wdt_read_supported) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + } else > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + wdt_reg &= ~KEMPLD_WDT_NOW1_ENABLE_MASK; > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + kempld_write8(pld, KEMPLD_WDT_NOW1, wdt_reg); > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + kempld_release_mutex(pld); > > + > > + if (kempld_now1_wdt_read_supported) { > > + /* read out the register again to check if everything worked */ > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + kempld_release_mutex(pld); > > + > > + /* check if the watchdog was disabled */ > > + if (wdt_reg & KEMPLD_WDT_NOW1_ENABLE_MASK) > > + return -EACCES; > > + } > > + > > + return 0; > > +} > > + > > +static int kempld_now1_wdt_keepalive(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int wdt_reg; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + > > + if (kempld_now1_wdt_read_supported) { > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + } else { > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + /* write the state again to be sure the trigger register has > > + * the right level */ > > + kempld_write8(pld, KEMPLD_WDT_NOW1, wdt_reg); > > + } > > + > > + if (wdt_reg & KEMPLD_WDT_NOW1_KICK_MASK) > > + wdt_reg &= ~KEMPLD_WDT_NOW1_KICK_MASK; > > + else > > + wdt_reg |= KEMPLD_WDT_NOW1_KICK_MASK; > > + > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + > > + kempld_write8(pld, KEMPLD_WDT_NOW1, wdt_reg); > > + > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + > > + kempld_release_mutex(pld); > > + > > + return 0; > > +} > > + > > + > > +static int kempld_now1_wdt_settimeout(struct kempld_watchdog_data *wdt, > > + int check_only) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int wdt_reg; > > + int ret = 0; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + > > + if (kempld_now1_wdt_read_supported) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + } else > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + > > + wdt_reg &= ~KEMPLD_WDT_NOW1_TIMEOUT_MASK; > > + > > + switch (wdt->timeout) { > > + case 1: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_1SEC; > > + break; > > + case 5: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_5SEC; > > + break; > > + case 10: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_10SEC; > > + break; > > + case 30: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_30SEC; > > + break; > > + case 60: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_1MIN; > > + break; > > + case 300: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_5MIN; > > + break; > > + case 600: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_10MIN; > > + break; > > + case 900: > > + wdt_reg |= KEMPLD_WDT_NOW1_TIMEOUT_15MIN; > > + break; > > + default: > > + ret = -EINVAL; > > + dev_err(wdt->pld->dev, > > + "Invalid timeout value given!\n"); > > + } > > + > > + if (!check_only) { > > + if (ret == 0) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + > > + kempld_write8(pld, KEMPLD_WDT_NOW1, wdt_reg); > > + } > > + } > > + > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + > > + kempld_release_mutex(pld); > > + > > + return ret; > > +} > > + > > +static int kempld_now1_wdt_gettimeout(struct kempld_watchdog_data *wdt, > > + struct kempld_watchdog_stage *stage) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int wdt_reg; > > + int timeout; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + > > + if (kempld_now1_wdt_read_supported) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + } else > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + > > + kempld_release_mutex(pld); > > + > > + switch (wdt_reg&KEMPLD_WDT_NOW1_TIMEOUT_MASK) { > > + case KEMPLD_WDT_NOW1_TIMEOUT_1SEC: > > + timeout = 1; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_5SEC: > > + timeout = 5; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_10SEC: > > + timeout = 10; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_30SEC: > > + timeout = 30; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_1MIN: > > + timeout = 60; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_5MIN: > > + timeout = 300; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_10MIN: > > + timeout = 600; > > + break; > > + case KEMPLD_WDT_NOW1_TIMEOUT_15MIN: > > + timeout = 900; > > + break; > > + default: > > + timeout = -ERANGE; > > + } > > + > > + return timeout; > > +} > > + > > +static ssize_t kempld_now1_wdt_write(struct file *file, const char __user > > + *data, size_t count, loff_t *ppos) > > +{ > > + struct kempld_watchdog_data *wdt = kempld_now1_wdt; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (count) { > > + kempld_now1_wdt_keepalive(wdt); > > + > > + if (!nowayout) { > > + size_t i; > > + > > + wdt->expect_close = 0; > > + > > + for (i = 0; i < count; i++) { > > + char c; > > + if (get_user(c, data+i)) > > + return -EFAULT; > > + if (c == 'V') > > + wdt->expect_close = 42; > > + } > > + } > > + } > > + > > + return count; > > +} > > + > > +static long kempld_now1_wdt_ioctl(struct file *file, unsigned int cmd, > > + unsigned long arg) > > +{ > > + void __user *argp = (void __user *)arg; > > + int __user *p = argp; > > + struct kempld_watchdog_data *wdt = kempld_now1_wdt; > > + int options; > > + int value; > > + int ret = 0; > > + > > + BUG_ON(wdt == NULL); > > + > > + switch (cmd) { > > + case WDIOC_GETSUPPORT: > > + if (copy_to_user(argp, &wdt->ident, sizeof(wdt->ident))) > > + ret = -EFAULT; > > + break; > > + case WDIOC_GETSTATUS: > > + case WDIOC_GETBOOTSTATUS: > > + ret = put_user(0, p); > > + break; > > + case WDIOC_SETOPTIONS: > > + if (get_user(options, p)) { > > + ret = -EFAULT; > > + break; > > + } > > + if (options & WDIOS_DISABLECARD) > > + ret = kempld_now1_wdt_stop(wdt); > > + if (options & WDIOS_ENABLECARD) { > > + ret = kempld_now1_wdt_start(wdt); > > + kempld_now1_wdt_keepalive(wdt); > > + } > > + break; > > + case WDIOC_KEEPALIVE: > > + kempld_now1_wdt_keepalive(wdt); > > + break; > > + case WDIOC_SETTIMEOUT: > > + if (get_user(value, p)) { > > + ret = -EFAULT; > > + break; > > + } > > + wdt->timeout = value; > > + ret = kempld_now1_wdt_settimeout(wdt, 0); > > + kempld_now1_wdt_keepalive(wdt); > > + break; > > + case WDIOC_GETTIMEOUT: > > + value = kempld_now1_wdt_gettimeout(wdt, wdt->timeout_stage); > > + if (timeout < 0) > > + ret = ERANGE; > > + else > > + ret = put_user(timeout, p); > > + break; > > + default: > > + ret = -ENOTTY; > > + } > > + > > + return ret; > > +} > > + > > +static int kempld_now1_wdt_release(struct inode *inode, struct file *file) > > +{ > > + struct kempld_watchdog_data *wdt = kempld_now1_wdt; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (wdt->expect_close) > > + kempld_now1_wdt_stop(wdt); > > + else { > > + dev_warn(wdt->pld->dev, > > + "Unexpected close, not stopping watchdog!\n"); > > + kempld_now1_wdt_keepalive(wdt); > > + } > > + > > + kempld_now1_wdt->expect_close = 0; > > + > > + clear_bit(0, &wdt->is_open); > > + > > + return 0; > > +} > > + > > +static int kempld_now1_wdt_open(struct inode *inode, struct file *file) > > +{ > > + int ret; > > + struct kempld_watchdog_data *wdt = kempld_now1_wdt; > > + struct kempld_device_data *pld = wdt->pld; > > + u8 wdt_reg; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (test_and_set_bit(0, &wdt->is_open)) > > + return -EBUSY; > > + > > + if (nowayout) > > + __module_get(THIS_MODULE); > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + if (kempld_now1_wdt_read_supported) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + } else { > > + wdt_reg = kempld_now1_wdt_reg_cache; > > + } > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + kempld_release_mutex(pld); > > + > > + /* kick the watchdog if it is already enabled, otherwise start it */ > > + if (wdt_reg & KEMPLD_WDT_NOW1_ENABLE_MASK) { > > + kempld_now1_wdt_keepalive(wdt); > > + } else { > > + ret = kempld_now1_wdt_settimeout(wdt, 0); > > + if (ret) > > + goto err_enable_wdt; > > + ret = kempld_now1_wdt_start(wdt); > > + if (ret) > > + goto err_enable_wdt; > > + } > > + > > + return nonseekable_open(inode, file); > > + > > +err_enable_wdt: > > + dev_err(wdt->pld->dev, "Failed to enable the watchdog timer!\n"); > > + wdt->expect_close = 1; > > + kempld_now1_wdt_release(inode, file); > > + > > + return ret; > > +} > > + > > +static const struct file_operations kempld_now1_wdt_fops = { > > + .owner = THIS_MODULE, > > + .llseek = no_llseek, > > + .write = kempld_now1_wdt_write, > > + .unlocked_ioctl = kempld_now1_wdt_ioctl, > > + .open = kempld_now1_wdt_open, > > + .release = kempld_now1_wdt_release, > > +}; > > + > > +static struct miscdevice kempld_now1_wdt_miscdev = { > > + .minor = WATCHDOG_MINOR, > > + .name = "watchdog", > > + .fops = &kempld_now1_wdt_fops, > > +}; > > + > > +static int kempld_now1_wdt_probe(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt; > > + struct kempld_device_data *pld; > > + u8 wdt_reg; > > + int ret; > > + > > + if (kempld_now1_wdt != NULL) { > > + dev_err(&pdev->dev, > > + "unable to support more than one watchdog devices\n"); > > + return -EMFILE; > > + } > > + > > + wdt = kzalloc(sizeof(struct kempld_watchdog_data), GFP_KERNEL); > > + if (wdt == NULL) { > > + dev_err(&pdev->dev, "unable to get memory for device data\n"); > > + ret = -ENOMEM; > > + goto err_alloc_dev_data; > > + } > > + > > + wdt->timeout_stage = kzalloc(sizeof(struct kempld_watchdog_stage), > > + GFP_KERNEL); > > + if (wdt->timeout_stage == NULL) { > > + dev_err(&pdev->dev, > > + "unable to get memory for watchdog stage\n"); > > + ret = -ENOMEM; > > + goto err_alloc_dev_data; > > + } > > + > > + wdt->stages = 1; > > + wdt->stage[0] = wdt->timeout_stage; > > + > > + pld = dev_get_drvdata(pdev->dev.parent); > > + wdt->pld = pld; > > + > > + platform_set_drvdata(pdev, wdt); > > + > > + strncpy(wdt->ident.identity, "nanoETXexpress-SP Watchdog", > > + sizeof(wdt->ident.identity)); > > + > > + /* set default values for the case we start the watchdog or change > > + * the configuration */ > > + wdt->timeout = timeout; > > + > > + /* use settimeout to check if the timeout parameter is valid */ > > + ret = kempld_now1_wdt_settimeout(wdt, 1); > > + if (ret) > > + goto err_check_timeout; > > + wdt->ident.firmware_version = (pld->info.major<<8) + pld->info.minor; > > + if (pld->info.major > 67) > > + kempld_now1_wdt_read_supported = 1; > > + else > > + dev_info(wdt->pld->dev, > > + "Watchdog revision does not support read - " > > + "unable to get watchdog state!\n"); > > + > > + /* get initial watchdog status */ > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_NOW1); > > + if (kempld_now1_wdt_read_supported) { > > + udelay(KEMPLD_WDT_NOW1_SYNC_DELAY); > > + wdt_reg = kempld_read8(pld, KEMPLD_WDT_NOW1); > > + } else { > > + wdt_reg = 0x0; > > + } > > + kempld_now1_wdt_reg_cache = wdt_reg; > > + kempld_release_mutex(wdt->pld); > > + > > + /* check if watchdog is enabled */ > > + if (wdt_reg & KEMPLD_WDT_NOW1_ENABLE_MASK) > > + dev_info(wdt->pld->dev, "Watchdog is already enabled!\n"); > > + > > + wdt->ident.options = WDIOF_KEEPALIVEPING; > > + wdt->ident.options |= WDIOF_SETTIMEOUT; > > + if (!nowayout) > > + wdt->ident.options |= WDIOF_MAGICCLOSE; > > + > > + kempld_now1_wdt = wdt; > > + > > + ret = misc_register(&kempld_now1_wdt_miscdev); > > + if (ret) > > + goto err_misc_register; > > + > > + dev_info(wdt->pld->dev, "watchdog initialized\n"); > > + > > + return 0; > > + > > +err_misc_register: > > + kfree(kempld_now1_wdt); > > + kempld_now1_wdt = NULL; > > +err_check_timeout: > > +err_alloc_dev_data: > > + return ret; > > +} > > + > > +static int kempld_now1_wdt_remove(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt = platform_get_drvdata(pdev); > > + > > + BUG_ON(wdt != kempld_now1_wdt); > > + > > + /* stop or at least keepalive the watchdog before we leave */ > > + if (wdt != NULL) { > > + if (!nowayout) > > + kempld_now1_wdt_stop(wdt); > > + else > > + kempld_now1_wdt_keepalive(wdt); > > + } > > + > > + misc_deregister(&kempld_now1_wdt_miscdev); > > + > > + kfree(wdt); > > + kempld_now1_wdt = NULL; > > + platform_set_drvdata(pdev, NULL); > > + > > + return 0; > > +} > > + > > +static struct platform_driver kempld_now1_wdt_driver = { > > + .driver = { > > + .name = "kempld_now1-wdt", > > + .owner = THIS_MODULE, > > + }, > > + .probe = kempld_now1_wdt_probe, > > + .remove = kempld_now1_wdt_remove, > > +}; > > + > > +static int __init kempld_now1_wdt_init(void) > > +{ > > + return platform_driver_register(&kempld_now1_wdt_driver); > > +} > > + > > +static void __exit kempld_now1_wdt_exit(void) > > +{ > > + platform_driver_unregister(&kempld_now1_wdt_driver); > > +} > > + > > +module_init(kempld_now1_wdt_init); > > +module_exit(kempld_now1_wdt_exit); > > + > > +MODULE_DESCRIPTION("KEM PLD nanoETXexpress-SP Watchdog Driver"); > > +MODULE_AUTHOR("Michael Brunner <[email protected]>"); > > +MODULE_LICENSE("GPL"); > > +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); > > diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c > > new file mode 100644 > > index 0000000..bc150e5 > > --- /dev/null > > +++ b/drivers/watchdog/kempld_wdt.c > > @@ -0,0 +1,796 @@ > > +/* > > + * kempld_wdt.c - Kontron PLD watchdog driver > > + * > > + * Copyright (c) 2010-2012 Kontron Europe GmbH > > + * Author: Michael Brunner <[email protected]> > > + * > > + * Note: From the PLD watchdog point of view timeout and pretimeout are > > + * defined differently than in the kernel. > > + * First the pretimeout stage runs out before the timeout stage gets > > + * active. This has to be kept in mind. > > + * > > + * Kernel/API: P-----| pretimeout > > + * |-----------------------T timeout > > + * Watchdog: |-----------------P pretimeout_stage > > + * |-----T timeout_stage > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License 2 as published > > + * by the Free Software Foundation. > > + * > > + * 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; see the file COPYING. If not, write to > > + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. > > + */ > > + > > +#include <linux/module.h> > > +#include <linux/moduleparam.h> > > +#include <linux/types.h> > > +#include <linux/miscdevice.h> > > +#include <linux/watchdog.h> > > +#include <linux/fs.h> > > +#include <linux/ioport.h> > > +#include <linux/init.h> > > +#include <linux/uaccess.h> > > +#include <linux/slab.h> > > +#include <linux/platform_device.h> > > +#include <linux/mfd/kempld.h> > > + > > +#include "kempld_wdt.h" > > + > > +#define WATCHDOG_DEFAULT_TIMEOUT 20 > > +#define WATCHDOG_DEFAULT_PRETIMEOUT 0 > > +static int timeout = -1; > > +static int pretimeout = -1; > > +/* The maximum timeout values have to be probed */ > > +module_param(timeout, int, 0); > > +MODULE_PARM_DESC(timeout, > > + "Watchdog timeout in seconds. (>0, default=" > > + __MODULE_STRING(WATCHDOG_DEFAULT_TIMEOUT) ")"); > > +module_param(pretimeout, int, 0); > > +MODULE_PARM_DESC(pretimeout, > > + "Watchdog pretimeout in seconds. (>=0, default=" > > + __MODULE_STRING(WATCHDOG_DEFAULT_PRETIMEOUT) ")"); > > + > > +static bool nowayout = WATCHDOG_NOWAYOUT; > > +module_param(nowayout, bool, 0); > > +MODULE_PARM_DESC(nowayout, > > + "Watchdog cannot be stopped once started (default=" > > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > > + > > +static struct kempld_watchdog_data *kempld_wdt; > > + > > +static int kempld_wdt_start(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + u8 status; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + status |= KEMPLD_WDT_CFG_ENABLE; > > + kempld_write8(pld, KEMPLD_WDT_CFG, status); > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + > > + kempld_release_mutex(pld); > > + > > + /* check if the watchdog was enabled */ > > + if (!(status & KEMPLD_WDT_CFG_ENABLE)) > > + return -EACCES; > > + > > + return 0; > > +} > > + > > +static int kempld_wdt_stop(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + u8 status; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + status &= ~KEMPLD_WDT_CFG_ENABLE; > > + kempld_write8(pld, KEMPLD_WDT_CFG, status); > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + > > + kempld_release_mutex(pld); > > + > > + /* check if the watchdog was disabled */ > > + if (status & KEMPLD_WDT_CFG_ENABLE) > > + return -EACCES; > > + > > + return 0; > > +} > > + > > +static int kempld_wdt_keepalive(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + > > + kempld_write8(pld, KEMPLD_WDT_KICK, 'K'); > > + > > + kempld_release_mutex(pld); > > + > > + return 0; > > +} > > + > > +static int kempld_wdt_gettimeout(struct kempld_watchdog_data *wdt, > > + struct kempld_watchdog_stage *stage) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + u8 stage_cfg; > > + int bits; > > + u64 timeout; > > + u32 remainder; > > + > > + if (stage == NULL) > > + return 0; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + > > + stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + timeout = kempld_read32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->num)); > > + > > + kempld_release_mutex(pld); > > + > > + bits = KEMPLD_WDT_STAGE_CFG_GET_PRESCALER(stage_cfg); > > + timeout = (timeout & stage->timeout_mask) * KEMPLD_PRESCALER(bits); > > + remainder = do_div(timeout, pld->pld_clock); > > + > > + /* Round up the return value if necessary */ > > + if ((timeout > 0) && (remainder >= (pld->pld_clock/2))) > > + timeout++; > > + > > + return timeout; > > +} > > + > > +static int kempld_wdt_setstageaction(struct kempld_watchdog_data *wdt, > > + struct kempld_watchdog_stage *stage, > > + int action) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + u8 stage_cfg; > > + > > + if (stage == NULL) > > + return -EINVAL; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + > > + stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_ACTION_MASK; > > + stage_cfg |= (action & KEMPLD_WDT_STAGE_CFG_ACTION_MASK); > > + if (action == KEMPLD_WDT_ACTION_RESET) > > + stage_cfg |= KEMPLD_WDT_STAGE_CFG_ASSERT; > > + else > > + stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_ASSERT; > > + > > + kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->num), stage_cfg); > > + > > + kempld_release_mutex(pld); > > + > > + return 0; > > +} > > + > > +static int kempld_wdt_setstagetimeout(struct kempld_watchdog_data *wdt, > > + struct kempld_watchdog_stage *stage, > > + int timeout) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + u8 stage_cfg; > > + u8 prescaler; > > + u64 stage_timeout64; > > + u32 stage_timeout; > > + u32 remainder; > > + > > + if (stage == NULL) > > + return -EINVAL; > > + > > + prescaler = KEMPLD_WDT_PRESCALER_21BIT; > > + > > + stage_timeout64 = ((u64)timeout*pld->pld_clock); > > + remainder = do_div(stage_timeout64, KEMPLD_PRESCALER(prescaler)); > > + if (remainder) > > + stage_timeout64++; > > + stage_timeout = stage_timeout64 & stage->timeout_mask; > > + > > + if (stage_timeout64 != (u64)stage_timeout) > > + return -EINVAL; > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + > > + stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num)); > > + stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_PRESCALER_MASK; > > + stage_cfg |= KEMPLD_WDT_STAGE_CFG_SET_PRESCALER(prescaler); > > + kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->num), stage_cfg); > > + kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->num), > > + stage_timeout); > > + > > + kempld_release_mutex(pld); > > + > > + return 0; > > +} > > + > > +static void kempld_wdt_update_timeouts(struct kempld_watchdog_data *wdt) > > +{ > > + int pretimeout_stage; > > + int timeout_stage; > > + > > + pretimeout_stage = kempld_wdt_gettimeout(wdt, wdt->pretimeout_stage); > > + timeout_stage = kempld_wdt_gettimeout(wdt, wdt->timeout_stage); > > + > > + if (pretimeout_stage) > > + wdt->pretimeout = timeout_stage; > > + else > > + wdt->pretimeout = 0; > > + > > + wdt->timeout = pretimeout_stage + timeout_stage; > > + > > + if (wdt->pretimeout < 0) { > > + wdt->pretimeout = WATCHDOG_DEFAULT_PRETIMEOUT; > > + dev_err(wdt->pld->dev, "failed to get valid pretimeout value\n" > > + " -> using driver default\n"); > > + } > > + if (wdt->timeout < 0) { > > + wdt->timeout = WATCHDOG_DEFAULT_TIMEOUT; > > + dev_err(wdt->pld->dev, "failed to get valid timeout value\n" > > + " -> using driver default\n"); > > + } > > +} > > + > > +static int kempld_wdt_settimeout(struct kempld_watchdog_data *wdt) > > +{ > > + int stage_timeout; > > + int stage_pretimeout; > > + int ret; > > + > > + if ((wdt->timeout <= 0) || > > + (wdt->pretimeout < 0) || > > + (wdt->pretimeout > wdt->timeout)) { > > + ret = -EINVAL; > > + goto err_check_values; > > + } > > + > > + if ((wdt->pretimeout == 0) || (wdt->pretimeout_stage == NULL)) { > > + if (wdt->pretimeout != 0) > > + dev_warn(wdt->pld->dev, > > + "no pretimeout stage available\n" > > + " -> only enabling reset\n"); > > + stage_pretimeout = 0; > > + stage_timeout = wdt->timeout; > > + } else { > > + stage_pretimeout = wdt->timeout - wdt->pretimeout; > > + stage_timeout = wdt->pretimeout; > > + } > > + > > + if (stage_pretimeout != 0) { > > + ret = kempld_wdt_setstageaction(wdt, wdt->pretimeout_stage, > > + KEMPLD_WDT_ACTION_NMI); > > + } else if ((stage_pretimeout == 0) > > + && (wdt->pretimeout_stage != NULL)) { > > + ret = kempld_wdt_setstageaction(wdt, wdt->pretimeout_stage, > > + KEMPLD_WDT_ACTION_NONE); > > + } else > > + ret = 0; > > + if (ret) > > + goto err_setstage; > > + > > + if (stage_pretimeout != 0) { > > + ret = kempld_wdt_setstagetimeout(wdt, wdt->pretimeout_stage, > > + stage_pretimeout); > > + if (ret) > > + goto err_setstage; > > + } > > + > > + ret = kempld_wdt_setstageaction(wdt, wdt->timeout_stage, > > + KEMPLD_WDT_ACTION_RESET); > > + if (ret) > > + goto err_setstage; > > + > > + ret = kempld_wdt_setstagetimeout(wdt, wdt->timeout_stage, > > + stage_timeout); > > + if (ret) > > + goto err_setstage; > > + > > + return 0; > > +err_setstage: > > +err_check_values: > > + return ret; > > +} > > + > > +static ssize_t kempld_wdt_write(struct file *file, const char __user *data, > > + size_t count, loff_t *ppos) > > +{ > > + struct kempld_watchdog_data *wdt = kempld_wdt; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (count) { > > + kempld_wdt_keepalive(wdt); > > + > > + if (!nowayout) { > > + size_t i; > > + > > + wdt->expect_close = 0; > > + > > + for (i = 0; i < count; i++) { > > + char c; > > + if (get_user(c, data+i)) > > + return -EFAULT; > > + if (c == 'V') > > + wdt->expect_close = 42; > > + } > > + } > > + } > > + > > + return count; > > +} > > + > > +static long kempld_wdt_ioctl(struct file *file, unsigned int cmd, > > + unsigned long arg) > > +{ > > + void __user *argp = (void __user *)arg; > > + int __user *p = argp; > > + struct kempld_watchdog_data *wdt = kempld_wdt; > > + int options; > > + int value; > > + int ret = 0; > > + > > + BUG_ON(wdt == NULL); > > + > > + switch (cmd) { > > + case WDIOC_GETSUPPORT: > > + if (copy_to_user(argp, &wdt->ident, sizeof(wdt->ident))) > > + ret = -EFAULT; > > + break; > > + case WDIOC_GETSTATUS: > > + case WDIOC_GETBOOTSTATUS: > > + ret = put_user(0, p); > > + break; > > + case WDIOC_SETOPTIONS: > > + if (get_user(options, p)) { > > + ret = -EFAULT; > > + break; > > + } > > + if (options & WDIOS_DISABLECARD) > > + ret = kempld_wdt_stop(wdt); > > + if (options & WDIOS_ENABLECARD) { > > + ret = kempld_wdt_start(wdt); > > + kempld_wdt_keepalive(wdt); > > + } > > + break; > > + case WDIOC_KEEPALIVE: > > + kempld_wdt_keepalive(wdt); > > + break; > > + case WDIOC_SETTIMEOUT: > > + if (get_user(value, p)) { > > + ret = -EFAULT; > > + break; > > + } > > + kempld_wdt_update_timeouts(wdt); > > + wdt->timeout = value; > > + ret = kempld_wdt_settimeout(wdt); > > + kempld_wdt_keepalive(wdt); > > + break; > > + case WDIOC_GETTIMEOUT: > > + value = kempld_wdt_gettimeout(wdt, wdt->timeout_stage); > > + value += kempld_wdt_gettimeout(wdt, wdt->pretimeout_stage); > > + if (value < 0) > > + ret = ERANGE; > > + else > > + ret = put_user(value, p); > > + break; > > + case WDIOC_SETPRETIMEOUT: > > + if (get_user(value, p)) { > > + ret = -EFAULT; > > + break; > > + } > > + kempld_wdt_update_timeouts(wdt); > > + wdt->pretimeout = value; > > + ret = kempld_wdt_settimeout(wdt); > > + kempld_wdt_keepalive(wdt); > > + break; > > + case WDIOC_GETPRETIMEOUT: > > + value = kempld_wdt_gettimeout(wdt, wdt->pretimeout_stage); > > + if (value) > > + value = kempld_wdt_gettimeout(wdt, wdt->timeout_stage); > > + if (value < 0) > > + ret = ERANGE; > > + else > > + ret = put_user(value, p); > > + break; > > + default: > > + ret = -ENOTTY; > > + } > > + > > + return ret; > > +} > > + > > +static int kempld_wdt_release(struct inode *inode, struct file *file) > > +{ > > + struct kempld_watchdog_data *wdt = kempld_wdt; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (wdt->expect_close) > > + kempld_wdt_stop(wdt); > > + else { > > + dev_warn(wdt->pld->dev, > > + "Unexpected close, not stopping watchdog!\n"); > > + kempld_wdt_keepalive(wdt); > > + } > > + > > + kempld_wdt->expect_close = 0; > > + > > + clear_bit(0, &wdt->is_open); > > + > > + return 0; > > +} > > + > > +static int kempld_wdt_open(struct inode *inode, struct file *file) > > +{ > > + int ret; > > + struct kempld_watchdog_data *wdt = kempld_wdt; > > + struct kempld_device_data *pld = wdt->pld; > > + u8 status; > > + > > + BUG_ON(wdt == NULL); > > + > > + if (test_and_set_bit(0, &wdt->is_open)) > > + return -EBUSY; > > + > > + if (nowayout) > > + __module_get(THIS_MODULE); > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + kempld_release_mutex(pld); > > + > > + /* kick the watchdog if it is already enabled, otherwise start it */ > > + if (status & KEMPLD_WDT_CFG_ENABLE) { > > + kempld_wdt_keepalive(wdt); > > + } else { > > + ret = kempld_wdt_settimeout(wdt); > > + if (ret) > > + goto err_enable_wdt; > > + ret = kempld_wdt_start(wdt); > > + if (ret) > > + goto err_enable_wdt; > > + } > > + > > + return nonseekable_open(inode, file); > > + > > +err_enable_wdt: > > + dev_err(wdt->pld->dev, "Failed to enable the watchdog timer!\n"); > > + wdt->expect_close = 1; > > + kempld_wdt_release(inode, file); > > + > > + return ret; > > +} > > + > > +static void kempld_wdt_release_stages(struct kempld_watchdog_data *wdt) > > +{ > > + int stage; > > + > > + wdt->timeout_stage = NULL; > > + wdt->pretimeout_stage = NULL; > > + > > + for (stage = 0; stage < KEMPLD_WDT_MAX_STAGES; stage++) { > > + kfree(wdt->stage[stage]); > > + wdt->stage[stage] = NULL; > > + } > > +} > > + > > +static int kempld_wdt_probe_stages(struct kempld_watchdog_data *wdt) > > +{ > > + struct kempld_device_data *pld = wdt->pld; > > + int i, ret; > > + u32 timeout_mask; > > + struct kempld_watchdog_stage *stage; > > + > > + wdt->stages = 0; > > + wdt->timeout_stage = NULL; > > + wdt->pretimeout_stage = NULL; > > + > > + for (i = 0; i < KEMPLD_WDT_MAX_STAGES; i++) { > > + int j; > > + u8 index, data, data_orig; > > + > > + index = KEMPLD_WDT_STAGE_TIMEOUT(i); > > + timeout_mask = ~0; > > + > > + kempld_get_mutex_set_index(pld, index); > > + > > + /* Probe each byte individually according to new spec revision. > > + * Register content is restored afterwards. */ > > + for (j = 0; j < 4; j++) { > > + data_orig = kempld_read8(pld, index); > > + kempld_write8(pld, index, 0x00); > > + data = kempld_read8(pld, index); > > + kempld_write8(pld, index, data_orig); > > + *(((u8 *)&timeout_mask)+j) &= data; > > + if (data != 0x0) > > + break; > > + index++; > > + } > > + > > + kempld_release_mutex(pld); > > + > > + if ((timeout_mask & 0xff) != 0xff) { > > + stage = kzalloc(sizeof(struct kempld_watchdog_stage), > > + GFP_KERNEL); > > + if (stage == NULL) { > > + ret = -ENOMEM; > > + goto err_alloc_stages; > > + } > > + stage->num = i; > > + stage->timeout_mask = ~timeout_mask; > > + wdt->stage[i] = stage; > > + wdt->stages++; > > + > > + /* assign available stages to timeout and pretimeout */ > > + if (wdt->timeout_stage == NULL) { > > + wdt->timeout_stage = stage; > > + } else if ((wdt->pretimeout_stage == NULL) && > > + (pld->feature_mask & KEMPLD_FEATURE_BIT_NMI)) { > > + wdt->pretimeout_stage = wdt->timeout_stage; > > + wdt->timeout_stage = stage; > > + } > > + } else > > + wdt->stage[i] = NULL; > > + } > > + > > + return 0; > > + > > +err_alloc_stages: > > + kempld_wdt_release_stages(wdt); > > + > > + return ret; > > +} > > + > > +static const struct file_operations kempld_wdt_fops = { > > + .owner = THIS_MODULE, > > + .llseek = no_llseek, > > + .write = kempld_wdt_write, > > + .unlocked_ioctl = kempld_wdt_ioctl, > > + .open = kempld_wdt_open, > > + .release = kempld_wdt_release, > > +}; > > + > > +static struct miscdevice kempld_wdt_miscdev = { > > + .minor = WATCHDOG_MINOR, > > + .name = "watchdog", > > + .fops = &kempld_wdt_fops, > > +}; > > + > > +static int kempld_wdt_probe(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt; > > + struct kempld_device_data *pld; > > + u8 status; > > + int ret; > > + > > + if (kempld_wdt != NULL) { > > + dev_err(&pdev->dev, > > + "unable to support more than one watchdog devices\n"); > > + return -EMFILE; > > + } > > + > > + wdt = kzalloc(sizeof(struct kempld_watchdog_data), GFP_KERNEL); > > + if (wdt == NULL) { > > + dev_err(&pdev->dev, "unable to get memory for device data\n"); > > + ret = -ENOMEM; > > + goto err_alloc_dev_data; > > + } > > + > > + pld = dev_get_drvdata(pdev->dev.parent); > > + wdt->pld = pld; > > + > > + platform_set_drvdata(pdev, wdt); > > + > > + strncpy(wdt->ident.identity, "KEMPLD Watchdog", > > + sizeof(wdt->ident.identity)); > > + > > + /* watchdog firmware version is identical to the CPLD version */ > > + wdt->ident.firmware_version = (pld->info.major<<24) > > + | (pld->info.minor<<16) | pld->info.buildnr; > > + > > + /* probe how many usable stages we have */ > > + ret = kempld_wdt_probe_stages(wdt); > > + if (ret) > > + goto err_probe_stages; > > + > > + /* get initial watchdog status */ > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + status = kempld_read8(pld, KEMPLD_WDT_CFG); > > + kempld_release_mutex(wdt->pld); > > + > > + /* check if the watchdog is already locked and enable the nowayout > > + * option in that case */ > > + if (status & (KEMPLD_WDT_CFG_ENABLE_LOCK | > > + KEMPLD_WDT_CFG_GLOBAL_LOCK)) { > > + if (!nowayout) > > + dev_warn(wdt->pld->dev, > > + "Forcing nowayout - watchdog lock enabled!\n"); > > + nowayout = 1; > > + } > > + > > + /* set default values for the case we start the watchdog or change > > + * the configuration */ > > + wdt->timeout = WATCHDOG_DEFAULT_TIMEOUT; > > + wdt->pretimeout = WATCHDOG_DEFAULT_PRETIMEOUT; > > + > > + /* check if watchdog is enabled */ > > + if (status & KEMPLD_WDT_CFG_ENABLE) { > > + /* Get current watchdog settings */ > > + kempld_wdt_update_timeouts(wdt); > > + > > + dev_info(wdt->pld->dev, "Watchdog is already enabled:\n" > > + "%d s timeout and %d s pretimeout!\n", > > + wdt->timeout, wdt->pretimeout); > > + } > > + > > + /* update the timeout settings if requested by module parameters */ > > + if (timeout > 0) > > + wdt->timeout = timeout; > > + if (pretimeout >= 0) > > + wdt->pretimeout = pretimeout; > > + > > + dev_info(wdt->pld->dev, "watchdog will be set on (re)start\n" > > + "new settings: %d s timeout and %d s pretimeout\n", > > + wdt->timeout, wdt->pretimeout); > > + > > + wdt->ident.options = WDIOF_KEEPALIVEPING; > > + if ((wdt->timeout_stage) && !(status & KEMPLD_WDT_CFG_GLOBAL_LOCK)) > > + wdt->ident.options |= WDIOF_SETTIMEOUT; > > + if (wdt->pretimeout_stage) > > + wdt->ident.options |= WDIOF_PRETIMEOUT; > > + if (!nowayout) > > + wdt->ident.options |= WDIOF_MAGICCLOSE; > > + > > + kempld_wdt = wdt; > > + > > + ret = misc_register(&kempld_wdt_miscdev); > > + if (ret) > > + goto err_misc_register; > > + > > + dev_info(wdt->pld->dev, > > + "%d stage watchdog initialized, pretimeout %ssupported\n", > > + wdt->stages, wdt->pretimeout_stage ? "" : "not "); > > + > > + return 0; > > + > > +err_probe_stages: > > +err_misc_register: > > + kfree(kempld_wdt); > > + kempld_wdt = NULL; > > +err_alloc_dev_data: > > + return ret; > > +} > > + > > +static void kempld_wdt_shutdown(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt = platform_get_drvdata(pdev); > > + > > + BUG_ON(wdt != kempld_wdt); > > + > > + /* stop or at least keepalive the watchdog before we leave */ > > + if (wdt != NULL) { > > + if (!nowayout) > > + kempld_wdt_stop(wdt); > > + else > > + kempld_wdt_keepalive(wdt); > > + } > > +} > > + > > +static int kempld_wdt_remove(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt = platform_get_drvdata(pdev); > > + > > + BUG_ON(wdt != kempld_wdt); > > + > > + /* stop or at least keepalive the watchdog before we leave */ > > + kempld_wdt_shutdown(pdev); > > + > > + misc_deregister(&kempld_wdt_miscdev); > > + > > + kempld_wdt_release_stages(wdt); > > + > > + kfree(wdt); > > + kempld_wdt = NULL; > > + platform_set_drvdata(pdev, NULL); > > + > > + return 0; > > +} > > + > > +#ifdef CONFIG_PM > > +static int wdt_pm_status_store; > > + > > +/* Disable watchdog if it is active during suspend */ > > +static int kempld_wdt_suspend(struct platform_device *pdev, > > + pm_message_t message) > > +{ > > + struct kempld_watchdog_data *wdt = platform_get_drvdata(pdev); > > + struct kempld_device_data *pld = dev_get_drvdata(pdev->dev.parent); > > + > > + kempld_get_mutex_set_index(pld, KEMPLD_WDT_CFG); > > + wdt_pm_status_store = kempld_read8(pld, KEMPLD_WDT_CFG); > > + kempld_release_mutex(pld); > > + > > + kempld_wdt_update_timeouts(wdt); > > + > > + if (wdt_pm_status_store & KEMPLD_WDT_CFG_ENABLE) > > + kempld_wdt_shutdown(pdev); > > + > > + return 0; > > +} > > + > > +/* Enable watchdog and configure it if necessary */ > > +static int kempld_wdt_resume(struct platform_device *pdev) > > +{ > > + struct kempld_watchdog_data *wdt = platform_get_drvdata(pdev); > > + int ret; > > + > > + /* if watchdog was stopped before suspend be sure it gets disabled > > + * again, for the case BIOS has enabled it during resume */ > > + if (wdt_pm_status_store & KEMPLD_WDT_CFG_ENABLE) { > > + ret = kempld_wdt_settimeout(wdt); > > + if (ret) > > + goto err_enable_wdt; > > + ret = kempld_wdt_start(wdt); > > + if (ret) > > + goto err_enable_wdt; > > + > > + dev_info(wdt->pld->dev, "Resuming watchdog operation:\n" > > + "%d s timeout and %d s pretimeout\n", wdt->timeout, > > + wdt->pretimeout); > > + } else > > + kempld_wdt_shutdown(pdev); > > + > > + return 0; > > + > > +err_enable_wdt: > > + dev_err(wdt->pld->dev, > > + "Failed to reenable the watchdog timer after resume!\n"); > > + > > + return ret; > > +} > > +#else > > +#define kempld_wdt_suspend NULL > > +#define kempld_wdt_resume NULL > > +#endif > > + > > +static struct platform_driver kempld_wdt_driver = { > > + .driver = { > > + .name = "kempld-wdt", > > + .owner = THIS_MODULE, > > + }, > > + .probe = kempld_wdt_probe, > > + .remove = kempld_wdt_remove, > > + .shutdown = kempld_wdt_shutdown, > > + .suspend = kempld_wdt_suspend, > > + .resume = kempld_wdt_resume, > > +}; > > + > > +static int __init kempld_wdt_init(void) > > +{ > > + return platform_driver_register(&kempld_wdt_driver); > > +} > > + > > +static void __exit kempld_wdt_exit(void) > > +{ > > + platform_driver_unregister(&kempld_wdt_driver); > > +} > > + > > +module_init(kempld_wdt_init); > > +module_exit(kempld_wdt_exit); > > + > > +MODULE_DESCRIPTION("KEM PLD Watchdog Driver"); > > +MODULE_AUTHOR("Michael Brunner <[email protected]>"); > > +MODULE_LICENSE("GPL"); > > +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); > > diff --git a/drivers/watchdog/kempld_wdt.h b/drivers/watchdog/kempld_wdt.h > > new file mode 100644 > > index 0000000..80f68f6 > > --- /dev/null > > +++ b/drivers/watchdog/kempld_wdt.h > > @@ -0,0 +1,75 @@ > > +/* > > + * kempld_wdt.h - Kontron PLD watchdog driver definitions > > + * > > + * Copyright (c) 2010-2012 Kontron Europe GmbH > > + * Author: Michael Brunner <[email protected]> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License 2 as published > > + * by the Free Software Foundation. > > + * > > + * 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; see the file COPYING. If not, write to > > + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. > > + */ > > + > > +#ifndef _KEMPLD_WDT_H_ > > +#define _KEMPLD_WDT_H_ > > + > > +/* watchdog register definitions */ > > +#define KEMPLD_WDT_KICK 0x16 > > +#define KEMPLD_WDT_CFG 0x17 > > +#define KEMPLD_WDT_CFG_STAGE_TIMEOUT_OCCURED(x) (1<<x) > > +#define KEMPLD_WDT_CFG_ENABLE_LOCK 0x8 > > +#define KEMPLD_WDT_CFG_ENABLE 0x10 > > +#define KEMPLD_WDT_CFG_AUTO_RELOAD 0x40 > > +#define KEMPLD_WDT_CFG_GLOBAL_LOCK 0x80 > > +#define KEMPLD_WDT_STAGE_CFG(x) (0x18+x) > > +#define KEMPLD_WDT_STAGE_CFG_ACTION_MASK 0x7 > > +#define KEMPLD_WDT_STAGE_CFG_GET_ACTION(x) (x & 0x7) > > +#define KEMPLD_WDT_STAGE_CFG_ASSERT (1<<3) > > +#define KEMPLD_WDT_STAGE_CFG_PRESCALER_MASK 0x30 > > +#define KEMPLD_WDT_STAGE_CFG_GET_PRESCALER(x) ((x & 0x30)>>4) > > +#define KEMPLD_WDT_STAGE_CFG_SET_PRESCALER(x) ((x & 0x30)<<4) > > +#define KEMPLD_WDT_STAGE_TIMEOUT(x) (0x1b+x*4) > > +#define KEMPLD_WDT_MAX_STAGES 3 > > + > > +#define KEMPLD_WDT_ACTION_NONE 0x0 > > +#define KEMPLD_WDT_ACTION_RESET 0x1 > > +#define KEMPLD_WDT_ACTION_NMI 0x2 > > +#define KEMPLD_WDT_ACTION_SMI 0x3 > > +#define KEMPLD_WDT_ACTION_SCI 0x4 > > +#define KEMPLD_WDT_ACTION_DELAY 0x5 > > + > > +#define KEMPLD_WDT_PRESCALER_21BIT 0x0 > > +#define KEMPLD_WDT_PRESCALER_17BIT 0x1 > > +#define KEMPLD_WDT_PRESCALER_12BIT 0x2 > > + > > +const int kempld_prescaler_bits[] = { 21, 17, 12 }; > > +#define KEMPLD_PRESCALER(x) > > (0xffffffff>>(32-kempld_prescaler_bits[x])) > > + > > + > > +struct kempld_watchdog_stage { > > + int num; > > + u32 timeout_mask; > > +}; > > + > > +struct kempld_watchdog_data { > > + int timeout; > > + int pretimeout; > > + unsigned long is_open; > > + unsigned long expect_close; > > + int stages; > > + struct kempld_watchdog_stage *timeout_stage; > > + struct kempld_watchdog_stage *pretimeout_stage; > > + struct kempld_device_data *pld; > > + struct watchdog_info ident; > > + struct kempld_watchdog_stage *stage[KEMPLD_WDT_MAX_STAGES]; > > +}; > > + > > +#endif /* _KEMPLD_WDT_H_ */ > > -- > > 1.7.9.5 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in > > the body of a message to [email protected] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
