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Date: Mon, 8 Apr 2013 10:15:21 -0700
From: Kevin Strasser <kevin.strasser@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: Michael Brunner <michael.brunner@...tron.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Wolfram Sang <wsa@...-dreams.de>,
Ben Dooks <ben-linux@...ff.org>, linux-i2c@...r.kernel.org,
Grant Likely <grant.likely@...retlab.ca>,
Linus Walleij <linus.walleij@...aro.org>,
Wim Van Sebroeck <wim@...ana.be>,
linux-watchdog@...r.kernel.org,
Darren Hart <dvhart@...ux.intel.com>,
Michael Brunner <mibru@....de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kevin Strasser <kevin.strasser@...ux.intel.com>
Subject: [PATCH 4/4] watchdog: Kontron PLD watchdog timer
From: Michael Brunner <michael.brunner@...tron.com>
Add watchdog timer support for the on-board PLD found on some Kontron
embedded modules.
Signed-off-by: Michael Brunner <michael.brunner@...tron.com>
Signed-off-by: Kevin Strasser <kevin.strasser@...ux.intel.com>
---
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 <michael.brunner@...tron.com>
+ *
+ * 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 <michael.brunner@...tron.com>");
+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 <michael.brunner@...tron.com>
+ *
+ * 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 <michael.brunner@...tron.com>");
+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 <michael.brunner@...tron.com>
+ *
+ * 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
--
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