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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 10:50:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 10:50:22 -0700
commit0486a39a6d6c8db78bde4d7b9c44e32dcc6050d4 (patch)
treec05562d55a5563caffbbc8f950585a3ea597435b /drivers/watchdog
parent302d5b3321aa61ff4ab15f0abc737d923355d33d (diff)
parent072cb8b628d312f5785ffdf324286a0519aed910 (diff)
Merge tag 'linux-watchdog-5.8-rc1' of git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck: - add new arm_smc_wdt watchdog driver - da9062 and da9063 improvements - clarify documentation about stop() that became optional - document r8a7742 support - some overall fixes and improvements * tag 'linux-watchdog-5.8-rc1' of git://www.linux-watchdog.org/linux-watchdog: watchdog: m54xx: Add missing include dt-bindings: watchdog: renesas,wdt: Document r8a7742 support watchdog: Fix runtime PM imbalance on error watchdog: riowd: remove unneeded semicolon watchdog: Add new arm_smc_wdt watchdog driver dt-bindings: watchdog: Add ARM smc wdt for mt8173 watchdog watchdog: imx2_wdt: update contact email watchdog: iTCO: fix link error watchdog: da9062: No need to ping manually before setting timeout watchdog: da9063: Make use of pre-configured timeout during probe watchdog: da9062: Initialize timeout during probe watchdog: clarify that stop() is optional watchdog: imx_sc_wdt: Fix reboot on crash watchdog: ts72xx_wdt: fix build error
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig14
-rw-r--r--drivers/watchdog/Makefile1
-rw-r--r--drivers/watchdog/arm_smc_wdt.c188
-rw-r--r--drivers/watchdog/da9062_wdt.c32
-rw-r--r--drivers/watchdog/da9063_wdt.c20
-rw-r--r--drivers/watchdog/imx2_wdt.c2
-rw-r--r--drivers/watchdog/imx_sc_wdt.c5
-rw-r--r--drivers/watchdog/m54xx_wdt.c1
-rw-r--r--drivers/watchdog/omap_wdt.c1
-rw-r--r--drivers/watchdog/riowd.c2
10 files changed, 248 insertions, 18 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b739c476955b..55b910c453da 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -678,6 +678,7 @@ config TS4800_WATCHDOG
config TS72XX_WATCHDOG
tristate "TS-72XX SBC Watchdog"
depends on MACH_TS72XX || COMPILE_TEST
+ select WATCHDOG_CORE
help
Technologic Systems TS-7200, TS-7250 and TS-7260 boards have
watchdog timer implemented in a external CPLD chip. Say Y here
@@ -867,6 +868,19 @@ config DIGICOLOR_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called digicolor_wdt.
+config ARM_SMC_WATCHDOG
+ tristate "ARM Secure Monitor Call based watchdog support"
+ depends on ARM || ARM64
+ depends on OF
+ depends on HAVE_ARM_SMCCC
+ select WATCHDOG_CORE
+ help
+ Say Y here to include support for a watchdog timer
+ implemented by the EL3 Secure Monitor on ARM platforms.
+ Requires firmware support.
+ To compile this driver as a module, choose M here: the
+ module will be called arm_smc_wdt.
+
config LPC18XX_WATCHDOG
tristate "LPC18xx/43xx Watchdog"
depends on ARCH_LPC18XX || COMPILE_TEST
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 6de2e4ceef19..97bed1d3d97c 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o
obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o
+obj-$(CONFIG_ARM_SMC_WATCHDOG) += arm_smc_wdt.o
# X86 (i386 + ia64 + x86_64) Architecture
obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
diff --git a/drivers/watchdog/arm_smc_wdt.c b/drivers/watchdog/arm_smc_wdt.c
new file mode 100644
index 000000000000..8f3d0c3a005f
--- /dev/null
+++ b/drivers/watchdog/arm_smc_wdt.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ARM Secure Monitor Call watchdog driver
+ *
+ * Copyright 2020 Google LLC.
+ * Julius Werner <jwerner@chromium.org>
+ * Based on mtk_wdt.c
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <uapi/linux/psci.h>
+
+#define DRV_NAME "arm_smc_wdt"
+#define DRV_VERSION "1.0"
+
+enum smcwd_call {
+ SMCWD_INIT = 0,
+ SMCWD_SET_TIMEOUT = 1,
+ SMCWD_ENABLE = 2,
+ SMCWD_PET = 3,
+ SMCWD_GET_TIMELEFT = 4,
+};
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int timeout;
+
+static int smcwd_call(struct watchdog_device *wdd, enum smcwd_call call,
+ unsigned long arg, struct arm_smccc_res *res)
+{
+ struct arm_smccc_res local_res;
+
+ if (!res)
+ res = &local_res;
+
+ arm_smccc_smc((u32)(uintptr_t)watchdog_get_drvdata(wdd), call, arg, 0,
+ 0, 0, 0, 0, res);
+
+ if (res->a0 == PSCI_RET_NOT_SUPPORTED)
+ return -ENODEV;
+ if (res->a0 == PSCI_RET_INVALID_PARAMS)
+ return -EINVAL;
+ if (res->a0 != PSCI_RET_SUCCESS)
+ return -EIO;
+ return 0;
+}
+
+static int smcwd_ping(struct watchdog_device *wdd)
+{
+ return smcwd_call(wdd, SMCWD_PET, 0, NULL);
+}
+
+static unsigned int smcwd_get_timeleft(struct watchdog_device *wdd)
+{
+ struct arm_smccc_res res;
+
+ smcwd_call(wdd, SMCWD_GET_TIMELEFT, 0, &res);
+ if (res.a0)
+ return 0;
+ return res.a1;
+}
+
+static int smcwd_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
+{
+ int res;
+
+ res = smcwd_call(wdd, SMCWD_SET_TIMEOUT, timeout, NULL);
+ if (!res)
+ wdd->timeout = timeout;
+ return res;
+}
+
+static int smcwd_stop(struct watchdog_device *wdd)
+{
+ return smcwd_call(wdd, SMCWD_ENABLE, 0, NULL);
+}
+
+static int smcwd_start(struct watchdog_device *wdd)
+{
+ return smcwd_call(wdd, SMCWD_ENABLE, 1, NULL);
+}
+
+static const struct watchdog_info smcwd_info = {
+ .identity = DRV_NAME,
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops smcwd_ops = {
+ .start = smcwd_start,
+ .stop = smcwd_stop,
+ .ping = smcwd_ping,
+ .set_timeout = smcwd_set_timeout,
+};
+
+static const struct watchdog_ops smcwd_timeleft_ops = {
+ .start = smcwd_start,
+ .stop = smcwd_stop,
+ .ping = smcwd_ping,
+ .set_timeout = smcwd_set_timeout,
+ .get_timeleft = smcwd_get_timeleft,
+};
+
+static int smcwd_probe(struct platform_device *pdev)
+{
+ struct watchdog_device *wdd;
+ int err;
+ struct arm_smccc_res res;
+ u32 smc_func_id;
+
+ wdd = devm_kzalloc(&pdev->dev, sizeof(*wdd), GFP_KERNEL);
+ if (!wdd)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, wdd);
+
+ if (of_property_read_u32(pdev->dev.of_node, "arm,smc-id",
+ &smc_func_id))
+ smc_func_id = 0x82003D06;
+ watchdog_set_drvdata(wdd, (void *)(uintptr_t)smc_func_id);
+
+ err = smcwd_call(wdd, SMCWD_INIT, 0, &res);
+ if (err < 0)
+ return err;
+
+ wdd->info = &smcwd_info;
+ /* get_timeleft is optional */
+ if (smcwd_call(wdd, SMCWD_GET_TIMELEFT, 0, NULL))
+ wdd->ops = &smcwd_ops;
+ else
+ wdd->ops = &smcwd_timeleft_ops;
+ wdd->timeout = res.a2;
+ wdd->max_timeout = res.a2;
+ wdd->min_timeout = res.a1;
+ wdd->parent = &pdev->dev;
+
+ watchdog_stop_on_reboot(wdd);
+ watchdog_stop_on_unregister(wdd);
+ watchdog_set_nowayout(wdd, nowayout);
+ watchdog_init_timeout(wdd, timeout, &pdev->dev);
+ err = smcwd_set_timeout(wdd, wdd->timeout);
+ if (err)
+ return err;
+
+ err = devm_watchdog_register_device(&pdev->dev, wdd);
+ if (err)
+ return err;
+
+ dev_info(&pdev->dev,
+ "Watchdog registered (timeout=%d sec, nowayout=%d)\n",
+ wdd->timeout, nowayout);
+
+ return 0;
+}
+
+static const struct of_device_id smcwd_dt_ids[] = {
+ { .compatible = "arm,smc-wdt" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, smcwd_dt_ids);
+
+static struct platform_driver smcwd_driver = {
+ .probe = smcwd_probe,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = smcwd_dt_ids,
+ },
+};
+
+module_platform_driver(smcwd_driver);
+
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Julius Werner <jwerner@chromium.org>");
+MODULE_DESCRIPTION("ARM Secure Monitor Call Watchdog Driver");
+MODULE_VERSION(DRV_VERSION);
diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
index 0ad15d55071c..706fb09c2f24 100644
--- a/drivers/watchdog/da9062_wdt.c
+++ b/drivers/watchdog/da9062_wdt.c
@@ -35,6 +35,15 @@ struct da9062_watchdog {
bool use_sw_pm;
};
+static unsigned int da9062_wdt_read_timeout(struct da9062_watchdog *wdt)
+{
+ unsigned int val;
+
+ regmap_read(wdt->hw->regmap, DA9062AA_CONTROL_D, &val);
+
+ return wdt_timeout[val & DA9062AA_TWDSCALE_MASK];
+}
+
static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs)
{
unsigned int i;
@@ -58,11 +67,6 @@ static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt,
unsigned int regval)
{
struct da9062 *chip = wdt->hw;
- int ret;
-
- ret = da9062_reset_watchdog_timer(wdt);
- if (ret)
- return ret;
regmap_update_bits(chip->regmap,
DA9062AA_CONTROL_D,
@@ -183,7 +187,7 @@ MODULE_DEVICE_TABLE(of, da9062_compatible_id_table);
static int da9062_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- int ret;
+ unsigned int timeout;
struct da9062 *chip;
struct da9062_watchdog *wdt;
@@ -213,11 +217,19 @@ static int da9062_wdt_probe(struct platform_device *pdev)
watchdog_set_drvdata(&wdt->wdtdev, wdt);
dev_set_drvdata(dev, &wdt->wdtdev);
- ret = devm_watchdog_register_device(dev, &wdt->wdtdev);
- if (ret < 0)
- return ret;
+ timeout = da9062_wdt_read_timeout(wdt);
+ if (timeout)
+ wdt->wdtdev.timeout = timeout;
+
+ /* Set timeout from DT value if available */
+ watchdog_init_timeout(&wdt->wdtdev, 0, dev);
+
+ if (timeout) {
+ da9062_wdt_set_timeout(&wdt->wdtdev, wdt->wdtdev.timeout);
+ set_bit(WDOG_HW_RUNNING, &wdt->wdtdev.status);
+ }
- return da9062_wdt_ping(&wdt->wdtdev);
+ return devm_watchdog_register_device(dev, &wdt->wdtdev);
}
static int __maybe_unused da9062_wdt_suspend(struct device *dev)
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 3d65e92a4e3f..423584252606 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -46,15 +46,16 @@ static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
}
/*
- * Return 0 if watchdog is disabled, else non zero.
+ * Read the currently active timeout.
+ * Zero means the watchdog is disabled.
*/
-static unsigned int da9063_wdt_is_running(struct da9063 *da9063)
+static unsigned int da9063_wdt_read_timeout(struct da9063 *da9063)
{
unsigned int val;
regmap_read(da9063->regmap, DA9063_REG_CONTROL_D, &val);
- return val & DA9063_TWDSCALE_MASK;
+ return wdt_timeout[val & DA9063_TWDSCALE_MASK];
}
static int da9063_wdt_disable_timer(struct da9063 *da9063)
@@ -191,6 +192,7 @@ static int da9063_wdt_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct da9063 *da9063;
struct watchdog_device *wdd;
+ unsigned int timeout;
if (!dev->parent)
return -EINVAL;
@@ -214,13 +216,19 @@ static int da9063_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(wdd, 128);
watchdog_set_drvdata(wdd, da9063);
- /* Set default timeout, maybe override it with DT value, scale it */
wdd->timeout = DA9063_WDG_TIMEOUT;
+
+ /* Use pre-configured timeout if watchdog is already running. */
+ timeout = da9063_wdt_read_timeout(da9063);
+ if (timeout)
+ wdd->timeout = timeout;
+
+ /* Set timeout, maybe override it with DT value, scale it */
watchdog_init_timeout(wdd, 0, dev);
da9063_wdt_set_timeout(wdd, wdd->timeout);
- /* Change the timeout to the default value if the watchdog is running */
- if (da9063_wdt_is_running(da9063)) {
+ /* Update timeout if the watchdog is already running. */
+ if (timeout) {
da9063_wdt_update_timeout(da9063, wdd->timeout);
set_bit(WDOG_HW_RUNNING, &wdd->status);
}
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 1fe472f56cb3..b84f80f7d342 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -2,7 +2,7 @@
/*
* Watchdog driver for IMX2 and later processors
*
- * Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
+ * Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <kernel@pengutronix.de>
* Copyright (C) 2014 Freescale Semiconductor, Inc.
*
* some parts adapted by similar drivers from Darius Augulis and Vladimir
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
index 60a32469f7de..e9ee22a7cb45 100644
--- a/drivers/watchdog/imx_sc_wdt.c
+++ b/drivers/watchdog/imx_sc_wdt.c
@@ -175,6 +175,11 @@ static int imx_sc_wdt_probe(struct platform_device *pdev)
wdog->timeout = DEFAULT_TIMEOUT;
watchdog_init_timeout(wdog, 0, dev);
+
+ ret = imx_sc_wdt_set_timeout(wdog, wdog->timeout);
+ if (ret)
+ return ret;
+
watchdog_stop_on_reboot(wdog);
watchdog_stop_on_unregister(wdog);
diff --git a/drivers/watchdog/m54xx_wdt.c b/drivers/watchdog/m54xx_wdt.c
index 22f335e1e164..60ed6252e5f4 100644
--- a/drivers/watchdog/m54xx_wdt.c
+++ b/drivers/watchdog/m54xx_wdt.c
@@ -29,6 +29,7 @@
#include <linux/bitops.h>
#include <linux/ioport.h>
#include <linux/uaccess.h>
+#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/m54xxsim.h>
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 9b91882fe3c4..1616f93dfad7 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -273,6 +273,7 @@ static int omap_wdt_probe(struct platform_device *pdev)
ret = watchdog_register_device(&wdev->wdog);
if (ret) {
+ pm_runtime_put(wdev->dev);
pm_runtime_disable(wdev->dev);
return ret;
}
diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
index dc3c06a92f93..1b9a6dc8f982 100644
--- a/drivers/watchdog/riowd.c
+++ b/drivers/watchdog/riowd.c
@@ -141,7 +141,7 @@ static long riowd_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
default:
return -EINVAL;
- };
+ }
return 0;
}