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]> --- 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-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/
