-DaVinci Watchdog Timer (WDT) Controller
+Texas Instruments DaVinci/Keystone Watchdog Timer (WDT) Controller
Required properties:
-- compatible : Should be "ti,davinci-wdt"
+- compatible : Should be "ti,davinci-wdt", "ti,keystone-wdt"
- reg : Should contain WDT registers location and length
+Optional properties:
+- timeout-sec : Contains the watchdog timeout in seconds
+- clocks : the clock feeding the watchdog timer.
+ Needed if platform uses clocks.
+ See clock-bindings.txt
+
+Documentation:
+Davinci DM646x - http://www.ti.com/lit/ug/spruer5b/spruer5b.pdf
+Keystone - http://www.ti.com/lit/ug/sprugv5a/sprugv5a.pdf
+
Examples:
wdt: wdt@2320000 {
compatible = "ti,davinci-wdt";
reg = <0x02320000 0x80>;
+ timeout-sec = <30>;
+ clocks = <&clkwdtimer0>;
};
--- /dev/null
+* GPIO-controlled Watchdog
+
+Required Properties:
+- compatible: Should contain "linux,wdt-gpio".
+- gpios: From common gpio binding; gpio connection to WDT reset pin.
+- hw_algo: The algorithm used by the driver. Should be one of the
+ following values:
+ - toggle: Either a high-to-low or a low-to-high transition clears
+ the WDT counter. The watchdog timer is disabled when GPIO is
+ left floating or connected to a three-state buffer.
+ - level: Low or high level starts counting WDT timeout,
+ the opposite level disables the WDT. Active level is determined
+ by the GPIO flags.
+- hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
+
+Example:
+ watchdog: watchdog {
+ /* ADM706 */
+ compatible = "linux,wdt-gpio";
+ gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
+ hw_algo = "toggle";
+ hw_margin_ms = <1600>;
+ };
occurred.
Required properties:
-- compatible : should be "samsung,s3c2410-wdt"
+- compatible : should be one among the following
+ (a) "samsung,s3c2410-wdt" for Exynos4 and previous SoCs
+ (b) "samsung,exynos5250-wdt" for Exynos5250
+ (c) "samsung,exynos5420-wdt" for Exynos5420
+
- reg : base physical address of the controller and length of memory mapped
region.
- interrupts : interrupt number to the cpu.
+- samsung,syscon-phandle : reference to syscon node (This property required only
+ in case of compatible being "samsung,exynos5250-wdt" or "samsung,exynos5420-wdt".
+ In case of Exynos5250 and 5420 this property points to syscon node holding the PMU
+ base address)
Optional properties:
- timeout-sec : contains the watchdog timeout in seconds.
+
+Example:
+
+watchdog@101D0000 {
+ compatible = "samsung,exynos5250-wdt";
+ reg = <0x101D0000 0x100>;
+ interrupts = <0 42 0>;
+ clocks = <&clock 336>;
+ clock-names = "watchdog";
+ samsung,syscon-phandle = <&pmu_syscon>;
+};
CONFIG_CRC7=y
CONFIG_XZ_DEC=y
CONFIG_AVERAGE=y
+CONFIG_WATCHDOG=y
+CONFIG_BCM_KONA_WDT=y
+CONFIG_BCM_KONA_WDT_DEBUG=y
This driver can also be built as a module. If so, the module
will be called da9055_wdt.
+config GPIO_WATCHDOG
+ tristate "Watchdog device controlled through GPIO-line"
+ depends on OF_GPIO
+ select WATCHDOG_CORE
+ help
+ If you say yes here you get support for watchdog device
+ controlled through GPIO-line.
+
config WM831X_WATCHDOG
tristate "WM831x watchdog"
depends on MFD_WM831X
tristate "S3C2410 Watchdog"
depends on HAVE_S3C2410_WATCHDOG
select WATCHDOG_CORE
+ select MFD_SYSCON if ARCH_EXYNOS5
help
Watchdog timer block in the Samsung SoCs. This will reboot
the system when the timer expires with the watchdog enabled.
config DW_WATCHDOG
tristate "Synopsys DesignWare watchdog"
- depends on ARM && HAVE_CLK
help
Say Y here if to include support for the Synopsys DesignWare
- watchdog timer found in many ARM chips.
+ watchdog timer found in many chips.
To compile this driver as a module, choose M here: the
module will be called dw_wdt.
config DAVINCI_WATCHDOG
tristate "DaVinci watchdog"
- depends on ARCH_DAVINCI
+ depends on ARCH_DAVINCI || ARCH_KEYSTONE
+ select WATCHDOG_CORE
help
Say Y here if to include support for the watchdog timer
- in the DaVinci DM644x/DM646x processors.
+ in the DaVinci DM644x/DM646x or Keystone processors.
To compile this driver as a module, choose M here: the
module will be called davinci_wdt.
To compile this driver as a loadable module, choose M here.
The module will be called bcm2835_wdt.
+config BCM_KONA_WDT
+ tristate "BCM Kona Watchdog"
+ depends on ARCH_BCM
+ select WATCHDOG_CORE
+ help
+ Support for the watchdog timer on the following Broadcom BCM281xx
+ family, which includes BCM11130, BCM11140, BCM11351, BCM28145 and
+ BCM28155 variants.
+
+ Say 'Y' or 'M' here to enable the driver. The module will be called
+ bcm_kona_wdt.
+
+config BCM_KONA_WDT_DEBUG
+ bool "DEBUGFS support for BCM Kona Watchdog"
+ depends on BCM_KONA_WDT
+ help
+ If enabled, adds /sys/kernel/debug/bcm_kona_wdt/info which provides
+ access to the driver's internal data structures as well as watchdog
+ timer hardware registres.
+
+ If in doubt, say 'N'.
+
config LANTIQ_WDT
tristate "Lantiq SoC watchdog"
depends on LANTIQ
config 8xxx_WDT
tristate "MPC8xxx Platform Watchdog Timer"
depends on PPC_8xx || PPC_83xx || PPC_86xx
+ select WATCHDOG_CORE
help
This driver is for a SoC level watchdog that exists on some
Freescale PowerPC processors. So far this driver supports:
obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
obj-$(CONFIG_MOXART_WDT) += moxart_wdt.o
obj-$(CONFIG_SIRFSOC_WATCHDOG) += sirfsoc_wdt.o
+obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
# Architecture Independent
obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
+obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
* want to register another driver on the same PCI id.
*/
-static DEFINE_PCI_DEVICE_TABLE(ali_pci_tbl) __used = {
+static const struct pci_device_id ali_pci_tbl[] __used = {
{ PCI_VENDOR_ID_AL, 0x1533, PCI_ANY_ID, PCI_ANY_ID,},
{ PCI_VENDOR_ID_AL, 0x1535, PCI_ANY_ID, PCI_ANY_ID,},
{ 0, },
module_init(alim7101_wdt_init);
module_exit(alim7101_wdt_unload);
-static DEFINE_PCI_DEVICE_TABLE(alim7101_pci_tbl) __used = {
+static const struct pci_device_id alim7101_pci_tbl[] __used = {
{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533) },
{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
{ }
--- /dev/null
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#define SECWDOG_CTRL_REG 0x00000000
+#define SECWDOG_COUNT_REG 0x00000004
+
+#define SECWDOG_RESERVED_MASK 0x1dffffff
+#define SECWDOG_WD_LOAD_FLAG 0x10000000
+#define SECWDOG_EN_MASK 0x08000000
+#define SECWDOG_SRSTEN_MASK 0x04000000
+#define SECWDOG_RES_MASK 0x00f00000
+#define SECWDOG_COUNT_MASK 0x000fffff
+
+#define SECWDOG_MAX_COUNT SECWDOG_COUNT_MASK
+#define SECWDOG_CLKS_SHIFT 20
+#define SECWDOG_MAX_RES 15
+#define SECWDOG_DEFAULT_RESOLUTION 4
+#define SECWDOG_MAX_TRY 1000
+
+#define SECS_TO_TICKS(x, w) ((x) << (w)->resolution)
+#define TICKS_TO_SECS(x, w) ((x) >> (w)->resolution)
+
+#define BCM_KONA_WDT_NAME "bcm_kona_wdt"
+
+struct bcm_kona_wdt {
+ void __iomem *base;
+ /*
+ * One watchdog tick is 1/(2^resolution) seconds. Resolution can take
+ * the values 0-15, meaning one tick can be 1s to 30.52us. Our default
+ * resolution of 4 means one tick is 62.5ms.
+ *
+ * The watchdog counter is 20 bits. Depending on resolution, the maximum
+ * counter value of 0xfffff expires after about 12 days (resolution 0)
+ * down to only 32s (resolution 15). The default resolution of 4 gives
+ * us a maximum of about 18 hours and 12 minutes before the watchdog
+ * times out.
+ */
+ int resolution;
+ spinlock_t lock;
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+ unsigned long busy_count;
+ struct dentry *debugfs;
+#endif
+};
+
+static int secure_register_read(struct bcm_kona_wdt *wdt, uint32_t offset)
+{
+ uint32_t val;
+ unsigned count = 0;
+
+ /*
+ * If the WD_LOAD_FLAG is set, the watchdog counter field is being
+ * updated in hardware. Once the WD timer is updated in hardware, it
+ * gets cleared.
+ */
+ do {
+ if (unlikely(count > 1))
+ udelay(5);
+ val = readl_relaxed(wdt->base + offset);
+ count++;
+ } while ((val & SECWDOG_WD_LOAD_FLAG) && count < SECWDOG_MAX_TRY);
+
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+ /* Remember the maximum number iterations due to WD_LOAD_FLAG */
+ if (count > wdt->busy_count)
+ wdt->busy_count = count;
+#endif
+
+ /* This is the only place we return a negative value. */
+ if (val & SECWDOG_WD_LOAD_FLAG)
+ return -ETIMEDOUT;
+
+ /* We always mask out reserved bits. */
+ val &= SECWDOG_RESERVED_MASK;
+
+ return val;
+}
+
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+
+static int bcm_kona_wdt_dbg_show(struct seq_file *s, void *data)
+{
+ int ctl_val, cur_val, ret;
+ unsigned long flags;
+ struct bcm_kona_wdt *wdt = s->private;
+
+ if (!wdt)
+ return seq_puts(s, "No device pointer\n");
+
+ spin_lock_irqsave(&wdt->lock, flags);
+ ctl_val = secure_register_read(wdt, SECWDOG_CTRL_REG);
+ cur_val = secure_register_read(wdt, SECWDOG_COUNT_REG);
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (ctl_val < 0 || cur_val < 0) {
+ ret = seq_puts(s, "Error accessing hardware\n");
+ } else {
+ int ctl, cur, ctl_sec, cur_sec, res;
+
+ ctl = ctl_val & SECWDOG_COUNT_MASK;
+ res = (ctl_val & SECWDOG_RES_MASK) >> SECWDOG_CLKS_SHIFT;
+ cur = cur_val & SECWDOG_COUNT_MASK;
+ ctl_sec = TICKS_TO_SECS(ctl, wdt);
+ cur_sec = TICKS_TO_SECS(cur, wdt);
+ ret = seq_printf(s, "Resolution: %d / %d\n"
+ "Control: %d s / %d (%#x) ticks\n"
+ "Current: %d s / %d (%#x) ticks\n"
+ "Busy count: %lu\n", res,
+ wdt->resolution, ctl_sec, ctl, ctl, cur_sec,
+ cur, cur, wdt->busy_count);
+ }
+
+ return ret;
+}
+
+static int bcm_kona_dbg_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, bcm_kona_wdt_dbg_show, inode->i_private);
+}
+
+static const struct file_operations bcm_kona_dbg_operations = {
+ .open = bcm_kona_dbg_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void bcm_kona_wdt_debug_init(struct platform_device *pdev)
+{
+ struct dentry *dir;
+ struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
+
+ if (!wdt)
+ return;
+
+ wdt->debugfs = NULL;
+
+ dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
+ if (IS_ERR_OR_NULL(dir))
+ return;
+
+ if (debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
+ &bcm_kona_dbg_operations))
+ wdt->debugfs = dir;
+ else
+ debugfs_remove_recursive(dir);
+}
+
+static void bcm_kona_wdt_debug_exit(struct platform_device *pdev)
+{
+ struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
+
+ if (wdt && wdt->debugfs) {
+ debugfs_remove_recursive(wdt->debugfs);
+ wdt->debugfs = NULL;
+ }
+}
+
+#else
+
+static void bcm_kona_wdt_debug_init(struct platform_device *pdev) {}
+static void bcm_kona_wdt_debug_exit(struct platform_device *pdev) {}
+
+#endif /* CONFIG_BCM_KONA_WDT_DEBUG */
+
+static int bcm_kona_wdt_ctrl_reg_modify(struct bcm_kona_wdt *wdt,
+ unsigned mask, unsigned newval)
+{
+ int val;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+
+ val = secure_register_read(wdt, SECWDOG_CTRL_REG);
+ if (val < 0) {
+ ret = val;
+ } else {
+ val &= ~mask;
+ val |= newval;
+ writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
+ }
+
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ return ret;
+}
+
+static int bcm_kona_wdt_set_resolution_reg(struct bcm_kona_wdt *wdt)
+{
+ if (wdt->resolution > SECWDOG_MAX_RES)
+ return -EINVAL;
+
+ return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_RES_MASK,
+ wdt->resolution << SECWDOG_CLKS_SHIFT);
+}
+
+static int bcm_kona_wdt_set_timeout_reg(struct watchdog_device *wdog,
+ unsigned watchdog_flags)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+
+ return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_COUNT_MASK,
+ SECS_TO_TICKS(wdog->timeout, wdt) |
+ watchdog_flags);
+}
+
+static int bcm_kona_wdt_set_timeout(struct watchdog_device *wdog,
+ unsigned int t)
+{
+ wdog->timeout = t;
+ return 0;
+}
+
+static unsigned int bcm_kona_wdt_get_timeleft(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+ int val;
+ unsigned long flags;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+ val = secure_register_read(wdt, SECWDOG_COUNT_REG);
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (val < 0)
+ return val;
+
+ return TICKS_TO_SECS(val & SECWDOG_COUNT_MASK, wdt);
+}
+
+static int bcm_kona_wdt_start(struct watchdog_device *wdog)
+{
+ return bcm_kona_wdt_set_timeout_reg(wdog,
+ SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK);
+}
+
+static int bcm_kona_wdt_stop(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+
+ return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_EN_MASK |
+ SECWDOG_SRSTEN_MASK, 0);
+}
+
+static struct watchdog_ops bcm_kona_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = bcm_kona_wdt_start,
+ .stop = bcm_kona_wdt_stop,
+ .set_timeout = bcm_kona_wdt_set_timeout,
+ .get_timeleft = bcm_kona_wdt_get_timeleft,
+};
+
+static struct watchdog_info bcm_kona_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
+ WDIOF_KEEPALIVEPING,
+ .identity = "Broadcom Kona Watchdog Timer",
+};
+
+static struct watchdog_device bcm_kona_wdt_wdd = {
+ .info = &bcm_kona_wdt_info,
+ .ops = &bcm_kona_wdt_ops,
+ .min_timeout = 1,
+ .max_timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
+ .timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
+};
+
+static void bcm_kona_wdt_shutdown(struct platform_device *pdev)
+{
+ bcm_kona_wdt_stop(&bcm_kona_wdt_wdd);
+}
+
+static int bcm_kona_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm_kona_wdt *wdt;
+ struct resource *res;
+ int ret;
+
+ wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(wdt->base))
+ return -ENODEV;
+
+ wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;
+ ret = bcm_kona_wdt_set_resolution_reg(wdt);
+ if (ret) {
+ dev_err(dev, "Failed to set resolution (error: %d)", ret);
+ return ret;
+ }
+
+ spin_lock_init(&wdt->lock);
+ platform_set_drvdata(pdev, wdt);
+ watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);
+
+ ret = bcm_kona_wdt_set_timeout_reg(&bcm_kona_wdt_wdd, 0);
+ if (ret) {
+ dev_err(dev, "Failed set watchdog timeout");
+ return ret;
+ }
+
+ ret = watchdog_register_device(&bcm_kona_wdt_wdd);
+ if (ret) {
+ dev_err(dev, "Failed to register watchdog device");
+ return ret;
+ }
+
+ bcm_kona_wdt_debug_init(pdev);
+ dev_dbg(dev, "Broadcom Kona Watchdog Timer");
+
+ return 0;
+}
+
+static int bcm_kona_wdt_remove(struct platform_device *pdev)
+{
+ bcm_kona_wdt_debug_exit(pdev);
+ bcm_kona_wdt_shutdown(pdev);
+ watchdog_unregister_device(&bcm_kona_wdt_wdd);
+ dev_dbg(&pdev->dev, "Watchdog driver disabled");
+
+ return 0;
+}
+
+static const struct of_device_id bcm_kona_wdt_of_match[] = {
+ { .compatible = "brcm,kona-wdt", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm_kona_wdt_of_match);
+
+static struct platform_driver bcm_kona_wdt_driver = {
+ .driver = {
+ .name = BCM_KONA_WDT_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = bcm_kona_wdt_of_match,
+ },
+ .probe = bcm_kona_wdt_probe,
+ .remove = bcm_kona_wdt_remove,
+ .shutdown = bcm_kona_wdt_shutdown,
+};
+
+module_platform_driver(bcm_kona_wdt_driver);
+
+MODULE_ALIAS("platform:" BCM_KONA_WDT_NAME);
+MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Kona Watchdog Driver");
+MODULE_LICENSE("GPL v2");
*
* Watchdog driver for DaVinci DM644x/DM646x processors
*
- * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2006-2013 Texas Instruments.
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
-#include <linux/bitops.h>
#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/clk.h>
-#include <linux/slab.h>
#include <linux/err.h>
#define MODULE_NAME "DAVINCI-WDT: "
#define WDKEY_SEQ0 (0xa5c6 << 16)
#define WDKEY_SEQ1 (0xda7e << 16)
-static int heartbeat = DEFAULT_HEARTBEAT;
+static int heartbeat;
-static DEFINE_SPINLOCK(io_lock);
-static unsigned long wdt_status;
-#define WDT_IN_USE 0
-#define WDT_OK_TO_CLOSE 1
-#define WDT_REGION_INITED 2
-#define WDT_DEVICE_INITED 3
-
-static void __iomem *wdt_base;
-struct clk *wdt_clk;
-
-static void wdt_service(void)
-{
- spin_lock(&io_lock);
-
- /* put watchdog in service state */
- iowrite32(WDKEY_SEQ0, wdt_base + WDTCR);
- /* put watchdog in active state */
- iowrite32(WDKEY_SEQ1, wdt_base + WDTCR);
-
- spin_unlock(&io_lock);
-}
+/*
+ * struct to hold data for each WDT device
+ * @base - base io address of WD device
+ * @clk - source clock of WDT
+ * @wdd - hold watchdog device as is in WDT core
+ */
+struct davinci_wdt_device {
+ void __iomem *base;
+ struct clk *clk;
+ struct watchdog_device wdd;
+};
-static void wdt_enable(void)
+static int davinci_wdt_start(struct watchdog_device *wdd)
{
u32 tgcr;
u32 timer_margin;
unsigned long wdt_freq;
+ struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
- wdt_freq = clk_get_rate(wdt_clk);
-
- spin_lock(&io_lock);
+ wdt_freq = clk_get_rate(davinci_wdt->clk);
/* disable, internal clock source */
- iowrite32(0, wdt_base + TCR);
+ iowrite32(0, davinci_wdt->base + TCR);
/* reset timer, set mode to 64-bit watchdog, and unreset */
- iowrite32(0, wdt_base + TGCR);
+ iowrite32(0, davinci_wdt->base + TGCR);
tgcr = TIMMODE_64BIT_WDOG | TIM12RS_UNRESET | TIM34RS_UNRESET;
- iowrite32(tgcr, wdt_base + TGCR);
+ iowrite32(tgcr, davinci_wdt->base + TGCR);
/* clear counter regs */
- iowrite32(0, wdt_base + TIM12);
- iowrite32(0, wdt_base + TIM34);
+ iowrite32(0, davinci_wdt->base + TIM12);
+ iowrite32(0, davinci_wdt->base + TIM34);
/* set timeout period */
- timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
- iowrite32(timer_margin, wdt_base + PRD12);
- timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
- iowrite32(timer_margin, wdt_base + PRD34);
+ timer_margin = (((u64)wdd->timeout * wdt_freq) & 0xffffffff);
+ iowrite32(timer_margin, davinci_wdt->base + PRD12);
+ timer_margin = (((u64)wdd->timeout * wdt_freq) >> 32);
+ iowrite32(timer_margin, davinci_wdt->base + PRD34);
/* enable run continuously */
- iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
+ iowrite32(ENAMODE12_PERIODIC, davinci_wdt->base + TCR);
/* Once the WDT is in pre-active state write to
* TIM12, TIM34, PRD12, PRD34, TCR, TGCR, WDTCR are
* write protected (except for the WDKEY field)
*/
/* put watchdog in pre-active state */
- iowrite32(WDKEY_SEQ0 | WDEN, wdt_base + WDTCR);
+ iowrite32(WDKEY_SEQ0 | WDEN, davinci_wdt->base + WDTCR);
/* put watchdog in active state */
- iowrite32(WDKEY_SEQ1 | WDEN, wdt_base + WDTCR);
-
- spin_unlock(&io_lock);
+ iowrite32(WDKEY_SEQ1 | WDEN, davinci_wdt->base + WDTCR);
+ return 0;
}
-static int davinci_wdt_open(struct inode *inode, struct file *file)
+static int davinci_wdt_ping(struct watchdog_device *wdd)
{
- if (test_and_set_bit(WDT_IN_USE, &wdt_status))
- return -EBUSY;
-
- wdt_enable();
+ struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
- return nonseekable_open(inode, file);
+ /* put watchdog in service state */
+ iowrite32(WDKEY_SEQ0, davinci_wdt->base + WDTCR);
+ /* put watchdog in active state */
+ iowrite32(WDKEY_SEQ1, davinci_wdt->base + WDTCR);
+ return 0;
}
-static ssize_t
-davinci_wdt_write(struct file *file, const char *data, size_t len,
- loff_t *ppos)
+static unsigned int davinci_wdt_get_timeleft(struct watchdog_device *wdd)
{
- if (len)
- wdt_service();
+ u64 timer_counter;
+ unsigned long freq;
+ u32 val;
+ struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
- return len;
-}
+ /* if timeout has occured then return 0 */
+ val = ioread32(davinci_wdt->base + WDTCR);
+ if (val & WDFLAG)
+ return 0;
-static const struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING,
- .identity = "DaVinci Watchdog",
-};
+ freq = clk_get_rate(davinci_wdt->clk);
-static long davinci_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int ret = -ENOTTY;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- ret = copy_to_user((struct watchdog_info *)arg, &ident,
- sizeof(ident)) ? -EFAULT : 0;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- ret = put_user(0, (int *)arg);
- break;
-
- case WDIOC_KEEPALIVE:
- wdt_service();
- ret = 0;
- break;
-
- case WDIOC_GETTIMEOUT:
- ret = put_user(heartbeat, (int *)arg);
- break;
- }
- return ret;
-}
+ if (!freq)
+ return 0;
-static int davinci_wdt_release(struct inode *inode, struct file *file)
-{
- wdt_service();
- clear_bit(WDT_IN_USE, &wdt_status);
+ timer_counter = ioread32(davinci_wdt->base + TIM12);
+ timer_counter |= ((u64)ioread32(davinci_wdt->base + TIM34) << 32);
- return 0;
+ do_div(timer_counter, freq);
+
+ return wdd->timeout - timer_counter;
}
-static const struct file_operations davinci_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = davinci_wdt_write,
- .unlocked_ioctl = davinci_wdt_ioctl,
- .open = davinci_wdt_open,
- .release = davinci_wdt_release,
+static const struct watchdog_info davinci_wdt_info = {
+ .options = WDIOF_KEEPALIVEPING,
+ .identity = "DaVinci/Keystone Watchdog",
};
-static struct miscdevice davinci_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &davinci_wdt_fops,
+static const struct watchdog_ops davinci_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = davinci_wdt_start,
+ .stop = davinci_wdt_ping,
+ .ping = davinci_wdt_ping,
+ .get_timeleft = davinci_wdt_get_timeleft,
};
static int davinci_wdt_probe(struct platform_device *pdev)
int ret = 0;
struct device *dev = &pdev->dev;
struct resource *wdt_mem;
+ struct watchdog_device *wdd;
+ struct davinci_wdt_device *davinci_wdt;
+
+ davinci_wdt = devm_kzalloc(dev, sizeof(*davinci_wdt), GFP_KERNEL);
+ if (!davinci_wdt)
+ return -ENOMEM;
- wdt_clk = devm_clk_get(dev, NULL);
- if (WARN_ON(IS_ERR(wdt_clk)))
- return PTR_ERR(wdt_clk);
+ davinci_wdt->clk = devm_clk_get(dev, NULL);
+ if (WARN_ON(IS_ERR(davinci_wdt->clk)))
+ return PTR_ERR(davinci_wdt->clk);
- clk_prepare_enable(wdt_clk);
+ clk_prepare_enable(davinci_wdt->clk);
- if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
- heartbeat = DEFAULT_HEARTBEAT;
+ platform_set_drvdata(pdev, davinci_wdt);
- dev_info(dev, "heartbeat %d sec\n", heartbeat);
+ wdd = &davinci_wdt->wdd;
+ wdd->info = &davinci_wdt_info;
+ wdd->ops = &davinci_wdt_ops;
+ wdd->min_timeout = 1;
+ wdd->max_timeout = MAX_HEARTBEAT;
+ wdd->timeout = DEFAULT_HEARTBEAT;
+
+ watchdog_init_timeout(wdd, heartbeat, dev);
+
+ dev_info(dev, "heartbeat %d sec\n", wdd->timeout);
+
+ watchdog_set_drvdata(wdd, davinci_wdt);
+ watchdog_set_nowayout(wdd, 1);
wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- wdt_base = devm_ioremap_resource(dev, wdt_mem);
- if (IS_ERR(wdt_base))
- return PTR_ERR(wdt_base);
+ davinci_wdt->base = devm_ioremap_resource(dev, wdt_mem);
+ if (IS_ERR(davinci_wdt->base))
+ return PTR_ERR(davinci_wdt->base);
- ret = misc_register(&davinci_wdt_miscdev);
- if (ret < 0) {
- dev_err(dev, "cannot register misc device\n");
- } else {
- set_bit(WDT_DEVICE_INITED, &wdt_status);
- }
+ ret = watchdog_register_device(wdd);
+ if (ret < 0)
+ dev_err(dev, "cannot register watchdog device\n");
return ret;
}
static int davinci_wdt_remove(struct platform_device *pdev)
{
- misc_deregister(&davinci_wdt_miscdev);
- clk_disable_unprepare(wdt_clk);
+ struct davinci_wdt_device *davinci_wdt = platform_get_drvdata(pdev);
+
+ watchdog_unregister_device(&davinci_wdt->wdd);
+ clk_disable_unprepare(davinci_wdt->clk);
return 0;
}
* 2 of the License, or (at your option) any later version.
*
* This file implements a driver for the Synopsys DesignWare watchdog device
- * in the many ARM subsystems. The watchdog has 16 different timeout periods
+ * in the many subsystems. The watchdog has 16 different timeout periods
* and these are a function of the input clock frequency.
*
* The DesignWare watchdog cannot be stopped once it has been started so we
--- /dev/null
+/*
+ * Driver for watchdog device controlled through GPIO-line
+ *
+ * Author: 2013, Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/watchdog.h>
+
+#define SOFT_TIMEOUT_MIN 1
+#define SOFT_TIMEOUT_DEF 60
+#define SOFT_TIMEOUT_MAX 0xffff
+
+enum {
+ HW_ALGO_TOGGLE,
+ HW_ALGO_LEVEL,
+};
+
+struct gpio_wdt_priv {
+ int gpio;
+ bool active_low;
+ bool state;
+ unsigned int hw_algo;
+ unsigned int hw_margin;
+ unsigned long last_jiffies;
+ struct notifier_block notifier;
+ struct timer_list timer;
+ struct watchdog_device wdd;
+};
+
+static void gpio_wdt_disable(struct gpio_wdt_priv *priv)
+{
+ gpio_set_value_cansleep(priv->gpio, !priv->active_low);
+
+ /* Put GPIO back to tristate */
+ if (priv->hw_algo == HW_ALGO_TOGGLE)
+ gpio_direction_input(priv->gpio);
+}
+
+static int gpio_wdt_start(struct watchdog_device *wdd)
+{
+ struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+ priv->state = priv->active_low;
+ gpio_direction_output(priv->gpio, priv->state);
+ priv->last_jiffies = jiffies;
+ mod_timer(&priv->timer, priv->last_jiffies + priv->hw_margin);
+
+ return 0;
+}
+
+static int gpio_wdt_stop(struct watchdog_device *wdd)
+{
+ struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+ mod_timer(&priv->timer, 0);
+ gpio_wdt_disable(priv);
+
+ return 0;
+}
+
+static int gpio_wdt_ping(struct watchdog_device *wdd)
+{
+ struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+ priv->last_jiffies = jiffies;
+
+ return 0;
+}
+
+static int gpio_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
+{
+ wdd->timeout = t;
+
+ return gpio_wdt_ping(wdd);
+}
+
+static void gpio_wdt_hwping(unsigned long data)
+{
+ struct watchdog_device *wdd = (struct watchdog_device *)data;
+ struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+ if (time_after(jiffies, priv->last_jiffies +
+ msecs_to_jiffies(wdd->timeout * 1000))) {
+ dev_crit(wdd->dev, "Timer expired. System will reboot soon!\n");
+ return;
+ }
+
+ /* Restart timer */
+ mod_timer(&priv->timer, jiffies + priv->hw_margin);
+
+ switch (priv->hw_algo) {
+ case HW_ALGO_TOGGLE:
+ /* Toggle output pin */
+ priv->state = !priv->state;
+ gpio_set_value_cansleep(priv->gpio, priv->state);
+ break;
+ case HW_ALGO_LEVEL:
+ /* Pulse */
+ gpio_set_value_cansleep(priv->gpio, !priv->active_low);
+ udelay(1);
+ gpio_set_value_cansleep(priv->gpio, priv->active_low);
+ break;
+ }
+}
+
+static int gpio_wdt_notify_sys(struct notifier_block *nb, unsigned long code,
+ void *unused)
+{
+ struct gpio_wdt_priv *priv = container_of(nb, struct gpio_wdt_priv,
+ notifier);
+
+ mod_timer(&priv->timer, 0);
+
+ switch (code) {
+ case SYS_HALT:
+ case SYS_POWER_OFF:
+ gpio_wdt_disable(priv);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static const struct watchdog_info gpio_wdt_ident = {
+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT,
+ .identity = "GPIO Watchdog",
+};
+
+static const struct watchdog_ops gpio_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = gpio_wdt_start,
+ .stop = gpio_wdt_stop,
+ .ping = gpio_wdt_ping,
+ .set_timeout = gpio_wdt_set_timeout,
+};
+
+static int gpio_wdt_probe(struct platform_device *pdev)
+{
+ struct gpio_wdt_priv *priv;
+ enum of_gpio_flags flags;
+ unsigned int hw_margin;
+ unsigned long f = 0;
+ const char *algo;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->gpio = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
+ if (!gpio_is_valid(priv->gpio))
+ return priv->gpio;
+
+ priv->active_low = flags & OF_GPIO_ACTIVE_LOW;
+
+ ret = of_property_read_string(pdev->dev.of_node, "hw_algo", &algo);
+ if (ret)
+ return ret;
+ if (!strncmp(algo, "toggle", 6)) {
+ priv->hw_algo = HW_ALGO_TOGGLE;
+ f = GPIOF_IN;
+ } else if (!strncmp(algo, "level", 5)) {
+ priv->hw_algo = HW_ALGO_LEVEL;
+ f = priv->active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ } else {
+ return -EINVAL;
+ }
+
+ ret = devm_gpio_request_one(&pdev->dev, priv->gpio, f,
+ dev_name(&pdev->dev));
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(pdev->dev.of_node,
+ "hw_margin_ms", &hw_margin);
+ if (ret)
+ return ret;
+ /* Disallow values lower than 2 and higher than 65535 ms */
+ if (hw_margin < 2 || hw_margin > 65535)
+ return -EINVAL;
+
+ /* Use safe value (1/2 of real timeout) */
+ priv->hw_margin = msecs_to_jiffies(hw_margin / 2);
+
+ watchdog_set_drvdata(&priv->wdd, priv);
+
+ priv->wdd.info = &gpio_wdt_ident;
+ priv->wdd.ops = &gpio_wdt_ops;
+ priv->wdd.min_timeout = SOFT_TIMEOUT_MIN;
+ priv->wdd.max_timeout = SOFT_TIMEOUT_MAX;
+
+ if (watchdog_init_timeout(&priv->wdd, 0, &pdev->dev) < 0)
+ priv->wdd.timeout = SOFT_TIMEOUT_DEF;
+
+ setup_timer(&priv->timer, gpio_wdt_hwping, (unsigned long)&priv->wdd);
+
+ ret = watchdog_register_device(&priv->wdd);
+ if (ret)
+ return ret;
+
+ priv->notifier.notifier_call = gpio_wdt_notify_sys;
+ ret = register_reboot_notifier(&priv->notifier);
+ if (ret)
+ watchdog_unregister_device(&priv->wdd);
+
+ return ret;
+}
+
+static int gpio_wdt_remove(struct platform_device *pdev)
+{
+ struct gpio_wdt_priv *priv = platform_get_drvdata(pdev);
+
+ del_timer_sync(&priv->timer);
+ unregister_reboot_notifier(&priv->notifier);
+ watchdog_unregister_device(&priv->wdd);
+
+ return 0;
+}
+
+static const struct of_device_id gpio_wdt_dt_ids[] = {
+ { .compatible = "linux,wdt-gpio", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, gpio_wdt_dt_ids);
+
+static struct platform_driver gpio_wdt_driver = {
+ .driver = {
+ .name = "gpio-wdt",
+ .owner = THIS_MODULE,
+ .of_match_table = gpio_wdt_dt_ids,
+ },
+ .probe = gpio_wdt_probe,
+ .remove = gpio_wdt_remove,
+};
+module_platform_driver(gpio_wdt_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("GPIO Watchdog");
+MODULE_LICENSE("GPL");
#endif /* CONFIG_HPWDT_NMI_DECODING */
#include <asm/nmi.h>
-#define HPWDT_VERSION "1.3.2"
+#define HPWDT_VERSION "1.3.3"
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
static unsigned long __iomem *hpwdt_timer_reg;
static unsigned long __iomem *hpwdt_timer_con;
-static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
+static const struct pci_device_id hpwdt_devices[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
{0}, /* terminate list */
"but unable to determine source.\n");
}
}
- panic("An NMI occurred, please see the Integrated "
- "Management Log for details.\n");
+ panic("An NMI occurred. Depending on your system the reason "
+ "for the NMI is logged in any one of the following "
+ "resources:\n"
+ "1. Integrated Management Log (IML)\n"
+ "2. OA Syslog\n"
+ "3. OA Forward Progress Log\n"
+ "4. iLO Event Log");
out:
return NMI_DONE;
/*
* Data for PCI driver interface
*/
-static DEFINE_PCI_DEVICE_TABLE(esb_pci_tbl) = {
+static const struct pci_device_id esb_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
{ 0, }, /* End of list */
};
* Watchdog driver for IMX2 and later processors
*
* Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
*
* some parts adapted by similar drivers from Darius Augulis and Vladimir
* Zapolskiy, additional improvements by Wim Van Sebroeck.
#define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */
#define IMX2_WDT_WCR_WRE (1 << 3) /* -> WDOG Reset Enable */
#define IMX2_WDT_WCR_WDE (1 << 2) /* -> Watchdog Enable */
+#define IMX2_WDT_WCR_WDZST (1 << 0) /* -> Watchdog timer Suspend */
#define IMX2_WDT_WSR 0x02 /* Service Register */
#define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */
{
u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR);
+ /* Suspend timer in low power mode, write once-only */
+ val |= IMX2_WDT_WCR_WDZST;
/* Strip the old watchdog Time-Out value */
val &= ~IMX2_WDT_WCR_WT;
/* Generate reset if WDOG times out */
* to 0
*/
static int prescale = 1;
-static unsigned int timeout_sec;
-static unsigned long wdt_is_open;
static DEFINE_SPINLOCK(wdt_spinlock);
static void mpc8xxx_wdt_keepalive(void)
spin_unlock(&wdt_spinlock);
}
+static struct watchdog_device mpc8xxx_wdt_dev;
static void mpc8xxx_wdt_timer_ping(unsigned long arg);
-static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, 0);
+static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0,
+ (unsigned long)&mpc8xxx_wdt_dev);
static void mpc8xxx_wdt_timer_ping(unsigned long arg)
{
+ struct watchdog_device *w = (struct watchdog_device *)arg;
+
mpc8xxx_wdt_keepalive();
/* We're pinging it twice faster than needed, just to be sure. */
- mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
-}
-
-static void mpc8xxx_wdt_pr_warn(const char *msg)
-{
- pr_crit("%s, expect the %s soon!\n", msg,
- reset ? "reset" : "machine check exception");
+ mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
}
-static ssize_t mpc8xxx_wdt_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count)
- mpc8xxx_wdt_keepalive();
- return count;
-}
-
-static int mpc8xxx_wdt_open(struct inode *inode, struct file *file)
+static int mpc8xxx_wdt_start(struct watchdog_device *w)
{
u32 tmp = SWCRR_SWEN;
- if (test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
-
- /* Once we start the watchdog we can't stop it */
- if (nowayout)
- __module_get(THIS_MODULE);
/* Good, fire up the show */
if (prescale)
del_timer_sync(&wdt_timer);
- return nonseekable_open(inode, file);
+ return 0;
}
-static int mpc8xxx_wdt_release(struct inode *inode, struct file *file)
+static int mpc8xxx_wdt_ping(struct watchdog_device *w)
{
- if (!nowayout)
- mpc8xxx_wdt_timer_ping(0);
- else
- mpc8xxx_wdt_pr_warn("watchdog closed");
- clear_bit(0, &wdt_is_open);
+ mpc8xxx_wdt_keepalive();
return 0;
}
-static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
+static int mpc8xxx_wdt_stop(struct watchdog_device *w)
{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static const struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING,
- .firmware_version = 1,
- .identity = "MPC8xxx",
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- mpc8xxx_wdt_keepalive();
- return 0;
- case WDIOC_GETTIMEOUT:
- return put_user(timeout_sec, p);
- default:
- return -ENOTTY;
- }
+ mod_timer(&wdt_timer, jiffies);
+ return 0;
}
-static const struct file_operations mpc8xxx_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = mpc8xxx_wdt_write,
- .unlocked_ioctl = mpc8xxx_wdt_ioctl,
- .open = mpc8xxx_wdt_open,
- .release = mpc8xxx_wdt_release,
+static struct watchdog_info mpc8xxx_wdt_info = {
+ .options = WDIOF_KEEPALIVEPING,
+ .firmware_version = 1,
+ .identity = "MPC8xxx",
};
-static struct miscdevice mpc8xxx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &mpc8xxx_wdt_fops,
+static struct watchdog_ops mpc8xxx_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = mpc8xxx_wdt_start,
+ .ping = mpc8xxx_wdt_ping,
+ .stop = mpc8xxx_wdt_stop,
+};
+
+static struct watchdog_device mpc8xxx_wdt_dev = {
+ .info = &mpc8xxx_wdt_info,
+ .ops = &mpc8xxx_wdt_ops,
};
static const struct of_device_id mpc8xxx_wdt_match[];
const struct mpc8xxx_wdt_type *wdt_type;
u32 freq = fsl_get_sys_freq();
bool enabled;
+ unsigned int timeout_sec;
match = of_match_device(mpc8xxx_wdt_match, &ofdev->dev);
if (!match)
else
timeout_sec = timeout / freq;
+ mpc8xxx_wdt_dev.timeout = timeout_sec;
#ifdef MODULE
ret = mpc8xxx_wdt_init_late();
if (ret)
* userspace handles it.
*/
if (enabled)
- mpc8xxx_wdt_timer_ping(0);
+ mod_timer(&wdt_timer, jiffies);
return 0;
err_unmap:
iounmap(wd_base);
static int mpc8xxx_wdt_remove(struct platform_device *ofdev)
{
- mpc8xxx_wdt_pr_warn("watchdog removed");
+ pr_crit("Watchdog removed, expect the %s soon!\n",
+ reset ? "reset" : "machine check exception");
del_timer_sync(&wdt_timer);
- misc_deregister(&mpc8xxx_wdt_miscdev);
+ watchdog_unregister_device(&mpc8xxx_wdt_dev);
iounmap(wd_base);
return 0;
if (!wd_base)
return -ENODEV;
- ret = misc_register(&mpc8xxx_wdt_miscdev);
+ watchdog_set_nowayout(&mpc8xxx_wdt_dev, nowayout);
+
+ ret = watchdog_register_device(&mpc8xxx_wdt_dev);
if (ret) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ pr_err("cannot register watchdog device (err=%d)\n", ret);
return ret;
}
return 0;
* register a pci_driver, because someone else might one day
* want to register another driver on the same PCI id.
*/
-static DEFINE_PCI_DEVICE_TABLE(tco_pci_tbl) = {
+static const struct pci_device_id tco_pci_tbl[] = {
{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS,
PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS,
cards_found--;
}
-static DEFINE_PCI_DEVICE_TABLE(pcipcwd_pci_tbl) = {
+static const struct pci_device_id pcipcwd_pci_tbl[] = {
{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
PCI_ANY_ID, PCI_ANY_ID, },
{ 0 }, /* End of list */
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#define S3C2410_WTCON 0x00
#define S3C2410_WTDAT 0x04
#define CONFIG_S3C2410_WATCHDOG_ATBOOT (0)
#define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
+#define EXYNOS5_RST_STAT_REG_OFFSET 0x0404
+#define EXYNOS5_WDT_DISABLE_REG_OFFSET 0x0408
+#define EXYNOS5_WDT_MASK_RESET_REG_OFFSET 0x040c
+#define QUIRK_HAS_PMU_CONFIG (1 << 0)
+#define QUIRK_HAS_RST_STAT (1 << 1)
+
+/* These quirks require that we have a PMU register map */
+#define QUIRKS_HAVE_PMUREG (QUIRK_HAS_PMU_CONFIG | \
+ QUIRK_HAS_RST_STAT)
+
static bool nowayout = WATCHDOG_NOWAYOUT;
static int tmr_margin;
static int tmr_atboot = CONFIG_S3C2410_WATCHDOG_ATBOOT;
"0 to reboot (default 0)");
MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
+/**
+ * struct s3c2410_wdt_variant - Per-variant config data
+ *
+ * @disable_reg: Offset in pmureg for the register that disables the watchdog
+ * timer reset functionality.
+ * @mask_reset_reg: Offset in pmureg for the register that masks the watchdog
+ * timer reset functionality.
+ * @mask_bit: Bit number for the watchdog timer in the disable register and the
+ * mask reset register.
+ * @rst_stat_reg: Offset in pmureg for the register that has the reset status.
+ * @rst_stat_bit: Bit number in the rst_stat register indicating a watchdog
+ * reset.
+ * @quirks: A bitfield of quirks.
+ */
+
+struct s3c2410_wdt_variant {
+ int disable_reg;
+ int mask_reset_reg;
+ int mask_bit;
+ int rst_stat_reg;
+ int rst_stat_bit;
+ u32 quirks;
+};
+
struct s3c2410_wdt {
struct device *dev;
struct clk *clock;
unsigned long wtdat_save;
struct watchdog_device wdt_device;
struct notifier_block freq_transition;
+ struct s3c2410_wdt_variant *drv_data;
+ struct regmap *pmureg;
};
+static const struct s3c2410_wdt_variant drv_data_s3c2410 = {
+ .quirks = 0
+};
+
+#ifdef CONFIG_OF
+static const struct s3c2410_wdt_variant drv_data_exynos5250 = {
+ .disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
+ .mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
+ .mask_bit = 20,
+ .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+ .rst_stat_bit = 20,
+ .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT,
+};
+
+static const struct s3c2410_wdt_variant drv_data_exynos5420 = {
+ .disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
+ .mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
+ .mask_bit = 0,
+ .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+ .rst_stat_bit = 9,
+ .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT,
+};
+
+static const struct of_device_id s3c2410_wdt_match[] = {
+ { .compatible = "samsung,s3c2410-wdt",
+ .data = &drv_data_s3c2410 },
+ { .compatible = "samsung,exynos5250-wdt",
+ .data = &drv_data_exynos5250 },
+ { .compatible = "samsung,exynos5420-wdt",
+ .data = &drv_data_exynos5420 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
+#endif
+
+static const struct platform_device_id s3c2410_wdt_ids[] = {
+ {
+ .name = "s3c2410-wdt",
+ .driver_data = (unsigned long)&drv_data_s3c2410,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(platform, s3c2410_wdt_ids);
+
/* watchdog control routines */
#define DBG(fmt, ...) \
return container_of(nb, struct s3c2410_wdt, freq_transition);
}
+static int s3c2410wdt_mask_and_disable_reset(struct s3c2410_wdt *wdt, bool mask)
+{
+ int ret;
+ u32 mask_val = 1 << wdt->drv_data->mask_bit;
+ u32 val = 0;
+
+ /* No need to do anything if no PMU CONFIG needed */
+ if (!(wdt->drv_data->quirks & QUIRK_HAS_PMU_CONFIG))
+ return 0;
+
+ if (mask)
+ val = mask_val;
+
+ ret = regmap_update_bits(wdt->pmureg,
+ wdt->drv_data->disable_reg,
+ mask_val, val);
+ if (ret < 0)
+ goto error;
+
+ ret = regmap_update_bits(wdt->pmureg,
+ wdt->drv_data->mask_reset_reg,
+ mask_val, val);
+ error:
+ if (ret < 0)
+ dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
+
+ return ret;
+}
+
static int s3c2410wdt_keepalive(struct watchdog_device *wdd)
{
struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
if (timeout < 1)
return -EINVAL;
- freq /= 128;
+ freq = DIV_ROUND_UP(freq, 128);
count = timeout * freq;
DBG("%s: count=%d, timeout=%d, freq=%lu\n",
*/
if (count >= 0x10000) {
- for (divisor = 1; divisor <= 0x100; divisor++) {
- if ((count / divisor) < 0x10000)
- break;
- }
+ divisor = DIV_ROUND_UP(count, 0xffff);
- if ((count / divisor) >= 0x10000) {
+ if (divisor > 0x100) {
dev_err(wdt->dev, "timeout %d too big\n", timeout);
return -EINVAL;
}
}
DBG("%s: timeout=%d, divisor=%d, count=%d (%08x)\n",
- __func__, timeout, divisor, count, count/divisor);
+ __func__, timeout, divisor, count, DIV_ROUND_UP(count, divisor));
- count /= divisor;
+ count = DIV_ROUND_UP(count, divisor);
wdt->count = count;
/* update the pre-scaler */
return IRQ_HANDLED;
}
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
}
#endif
+static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt)
+{
+ unsigned int rst_stat;
+ int ret;
+
+ if (!(wdt->drv_data->quirks & QUIRK_HAS_RST_STAT))
+ return 0;
+
+ ret = regmap_read(wdt->pmureg, wdt->drv_data->rst_stat_reg, &rst_stat);
+ if (ret)
+ dev_warn(wdt->dev, "Couldn't get RST_STAT register\n");
+ else if (rst_stat & BIT(wdt->drv_data->rst_stat_bit))
+ return WDIOF_CARDRESET;
+
+ return 0;
+}
+
+/* s3c2410_get_wdt_driver_data */
+static inline struct s3c2410_wdt_variant *
+get_wdt_drv_data(struct platform_device *pdev)
+{
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(s3c2410_wdt_match, pdev->dev.of_node);
+ return (struct s3c2410_wdt_variant *)match->data;
+ } else {
+ return (struct s3c2410_wdt_variant *)
+ platform_get_device_id(pdev)->driver_data;
+ }
+}
+
static int s3c2410wdt_probe(struct platform_device *pdev)
{
struct device *dev;
spin_lock_init(&wdt->lock);
wdt->wdt_device = s3c2410_wdd;
+ wdt->drv_data = get_wdt_drv_data(pdev);
+ if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) {
+ wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,syscon-phandle");
+ if (IS_ERR(wdt->pmureg)) {
+ dev_err(dev, "syscon regmap lookup failed.\n");
+ return PTR_ERR(wdt->pmureg);
+ }
+ }
+
wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (wdt_irq == NULL) {
dev_err(dev, "no irq resource specified\n");
watchdog_set_nowayout(&wdt->wdt_device, nowayout);
+ wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt);
+
ret = watchdog_register_device(&wdt->wdt_device);
if (ret) {
dev_err(dev, "cannot register watchdog (%d)\n", ret);
goto err_cpufreq;
}
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, false);
+ if (ret < 0)
+ goto err_unregister;
+
if (tmr_atboot && started == 0) {
dev_info(dev, "starting watchdog timer\n");
s3c2410wdt_start(&wdt->wdt_device);
return 0;
+ err_unregister:
+ watchdog_unregister_device(&wdt->wdt_device);
+
err_cpufreq:
s3c2410wdt_cpufreq_deregister(wdt);
static int s3c2410wdt_remove(struct platform_device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
+ if (ret < 0)
+ return ret;
+
watchdog_unregister_device(&wdt->wdt_device);
s3c2410wdt_cpufreq_deregister(wdt);
{
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+ s3c2410wdt_mask_and_disable_reset(wdt, true);
+
s3c2410wdt_stop(&wdt->wdt_device);
}
static int s3c2410wdt_suspend(struct device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
/* Save watchdog state, and turn it off. */
wdt->wtcon_save = readl(wdt->reg_base + S3C2410_WTCON);
wdt->wtdat_save = readl(wdt->reg_base + S3C2410_WTDAT);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
+ if (ret < 0)
+ return ret;
+
/* Note that WTCNT doesn't need to be saved. */
s3c2410wdt_stop(&wdt->wdt_device);
static int s3c2410wdt_resume(struct device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
/* Restore watchdog state. */
writel(wdt->wtdat_save, wdt->reg_base + S3C2410_WTCNT);/* Reset count */
writel(wdt->wtcon_save, wdt->reg_base + S3C2410_WTCON);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, false);
+ if (ret < 0)
+ return ret;
+
dev_info(dev, "watchdog %sabled\n",
(wdt->wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
static SIMPLE_DEV_PM_OPS(s3c2410wdt_pm_ops, s3c2410wdt_suspend,
s3c2410wdt_resume);
-#ifdef CONFIG_OF
-static const struct of_device_id s3c2410_wdt_match[] = {
- { .compatible = "samsung,s3c2410-wdt" },
- {},
-};
-MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
-#endif
-
static struct platform_driver s3c2410wdt_driver = {
.probe = s3c2410wdt_probe,
.remove = s3c2410wdt_remove,
.shutdown = s3c2410wdt_shutdown,
+ .id_table = s3c2410_wdt_ids,
.driver = {
.owner = THIS_MODULE,
.name = "s3c2410-wdt",
"Dimitry Andric <dimitry.andric@tomtom.com>");
MODULE_DESCRIPTION("S3C2410 Watchdog Device Driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:s3c2410-wdt");
.name = "sirfsoc-wdt",
.owner = THIS_MODULE,
.pm = &sirfsoc_wdt_pm_ops,
- .of_match_table = of_match_ptr(sirfsoc_wdt_of_match),
+ .of_match_table = sirfsoc_wdt_of_match,
},
.probe = sirfsoc_wdt_probe,
.remove = sirfsoc_wdt_remove,
* register a pci_driver, because someone else might
* want to register another driver on the same PCI id.
*/
-static DEFINE_PCI_DEVICE_TABLE(sp5100_tco_pci_tbl) = {
+static const struct pci_device_id sp5100_tco_pci_tbl[] = {
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
PCI_ANY_ID, },
{ 0, }, /* End of list */
pci_disable_device(pdev);
}
-static DEFINE_PCI_DEVICE_TABLE(wdt_pci_table) = {
+static const struct pci_device_id wdt_pci_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700) },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800) },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
watchdog_check_min_max_timeout(wdd);
/* try to get the timeout module parameter first */
- if (!watchdog_timeout_invalid(wdd, timeout_parm)) {
+ if (!watchdog_timeout_invalid(wdd, timeout_parm) && timeout_parm) {
wdd->timeout = timeout_parm;
return ret;
}
if (dev == NULL || dev->of_node == NULL)
return ret;
of_property_read_u32(dev->of_node, "timeout-sec", &t);
- if (!watchdog_timeout_invalid(wdd, t))
+ if (!watchdog_timeout_invalid(wdd, t) && t)
wdd->timeout = t;
else
ret = -EINVAL;
}
-static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = {
+static const struct pci_device_id wdtpci_pci_tbl[] = {
{
.vendor = PCI_VENDOR_ID_ACCESSIO,
.device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
projects / karo-tx-linux.git / commitdiff