diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 15 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/arm_smc_wdt.c | 188 | ||||
| -rw-r--r-- | drivers/watchdog/da9062_wdt.c | 32 | ||||
| -rw-r--r-- | drivers/watchdog/da9063_wdt.c | 20 | ||||
| -rw-r--r-- | drivers/watchdog/iTCO_wdt.c | 25 | ||||
| -rw-r--r-- | drivers/watchdog/imx2_wdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/imx_sc_wdt.c | 5 | ||||
| -rw-r--r-- | drivers/watchdog/intel-mid_wdt.c | 53 | ||||
| -rw-r--r-- | drivers/watchdog/m54xx_wdt.c | 1 | ||||
| -rw-r--r-- | drivers/watchdog/omap_wdt.c | 1 | ||||
| -rw-r--r-- | drivers/watchdog/riowd.c | 2 |
12 files changed, 305 insertions, 40 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0663c604bd64..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 @@ -1217,6 +1231,7 @@ config ITCO_WDT depends on (X86 || IA64) && PCI select WATCHDOG_CORE depends on I2C || I2C=n + depends on MFD_INTEL_PMC_BXT || !MFD_INTEL_PMC_BXT select LPC_ICH if !EXPERT select I2C_I801 if !EXPERT && I2C ---help--- 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/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index e707c4797f76..a370a185a41c 100644 --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -64,6 +64,7 @@ #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <linux/io.h> /* For inb/outb/... */ #include <linux/platform_data/itco_wdt.h> +#include <linux/mfd/intel_pmc_bxt.h> #include "iTCO_vendor.h" @@ -233,12 +234,24 @@ static int update_no_reboot_bit_cnt(void *priv, bool set) return val != newval ? -EIO : 0; } +static int update_no_reboot_bit_pmc(void *priv, bool set) +{ + struct intel_pmc_dev *pmc = priv; + u32 bits = PMC_CFG_NO_REBOOT_EN; + u32 value = set ? bits : 0; + + return intel_pmc_gcr_update(pmc, PMC_GCR_PMC_CFG_REG, bits, value); +} + static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p, - struct itco_wdt_platform_data *pdata) + struct platform_device *pdev, + struct itco_wdt_platform_data *pdata) { - if (pdata->update_no_reboot_bit) { - p->update_no_reboot_bit = pdata->update_no_reboot_bit; - p->no_reboot_priv = pdata->no_reboot_priv; + if (pdata->no_reboot_use_pmc) { + struct intel_pmc_dev *pmc = dev_get_drvdata(pdev->dev.parent); + + p->update_no_reboot_bit = update_no_reboot_bit_pmc; + p->no_reboot_priv = pmc; return; } @@ -478,14 +491,14 @@ static int iTCO_wdt_probe(struct platform_device *pdev) return -ENODEV; } - iTCO_wdt_no_reboot_bit_setup(p, pdata); + iTCO_wdt_no_reboot_bit_setup(p, pdev, pdata); /* * Get the Memory-Mapped GCS or PMC register, we need it for the * NO_REBOOT flag (TCO v2 and v3). */ if (p->iTCO_version >= 2 && p->iTCO_version < 6 && - !pdata->update_no_reboot_bit) { + !pdata->no_reboot_use_pmc) { p->gcs_pmc_res = platform_get_resource(pdev, IORESOURCE_MEM, ICH_RES_MEM_GCS_PMC); 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/intel-mid_wdt.c b/drivers/watchdog/intel-mid_wdt.c index 470213abfd3d..1ae03b64ef8b 100644 --- a/drivers/watchdog/intel-mid_wdt.c +++ b/drivers/watchdog/intel-mid_wdt.c @@ -33,14 +33,24 @@ enum { SCU_WATCHDOG_KEEPALIVE, }; -static inline int wdt_command(int sub, u32 *in, int inlen) +struct mid_wdt { + struct watchdog_device wd; + struct device *dev; + struct intel_scu_ipc_dev *scu; +}; + +static inline int +wdt_command(struct mid_wdt *mid, int sub, const void *in, size_t inlen, size_t size) { - return intel_scu_ipc_command(IPC_WATCHDOG, sub, in, inlen, NULL, 0); + struct intel_scu_ipc_dev *scu = mid->scu; + + return intel_scu_ipc_dev_command_with_size(scu, IPC_WATCHDOG, sub, in, + inlen, size, NULL, 0); } static int wdt_start(struct watchdog_device *wd) { - struct device *dev = watchdog_get_drvdata(wd); + struct mid_wdt *mid = watchdog_get_drvdata(wd); int ret, in_size; int timeout = wd->timeout; struct ipc_wd_start { @@ -49,38 +59,41 @@ static int wdt_start(struct watchdog_device *wd) } ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout }; /* - * SCU expects the input size for watchdog IPC to - * be based on 4 bytes + * SCU expects the input size for watchdog IPC to be 2 which is the + * size of the structure in dwords. SCU IPC normally takes bytes + * but this is a special case where we specify size to be different + * than inlen. */ in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4); - ret = wdt_command(SCU_WATCHDOG_START, (u32 *)&ipc_wd_start, in_size); + ret = wdt_command(mid, SCU_WATCHDOG_START, &ipc_wd_start, + sizeof(ipc_wd_start), in_size); if (ret) - dev_crit(dev, "error starting watchdog: %d\n", ret); + dev_crit(mid->dev, "error starting watchdog: %d\n", ret); return ret; } static int wdt_ping(struct watchdog_device *wd) { - struct device *dev = watchdog_get_drvdata(wd); + struct mid_wdt *mid = watchdog_get_drvdata(wd); int ret; - ret = wdt_command(SCU_WATCHDOG_KEEPALIVE, NULL, 0); + ret = wdt_command(mid, SCU_WATCHDOG_KEEPALIVE, NULL, 0, 0); if (ret) - dev_crit(dev, "Error executing keepalive: %d\n", ret); + dev_crit(mid->dev, "Error executing keepalive: %d\n", ret); return ret; } static int wdt_stop(struct watchdog_device *wd) { - struct device *dev = watchdog_get_drvdata(wd); + struct mid_wdt *mid = watchdog_get_drvdata(wd); int ret; - ret = wdt_command(SCU_WATCHDOG_STOP, NULL, 0); + ret = wdt_command(mid, SCU_WATCHDOG_STOP, NULL, 0, 0); if (ret) - dev_crit(dev, "Error stopping watchdog: %d\n", ret); + dev_crit(mid->dev, "Error stopping watchdog: %d\n", ret); return ret; } @@ -110,6 +123,7 @@ static int mid_wdt_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct watchdog_device *wdt_dev; struct intel_mid_wdt_pdata *pdata = dev->platform_data; + struct mid_wdt *mid; int ret; if (!pdata) { @@ -123,10 +137,13 @@ static int mid_wdt_probe(struct platform_device *pdev) return ret; } - wdt_dev = devm_kzalloc(dev, sizeof(*wdt_dev), GFP_KERNEL); - if (!wdt_dev) + mid = devm_kzalloc(dev, sizeof(*mid), GFP_KERNEL); + if (!mid) return -ENOMEM; + mid->dev = dev; + wdt_dev = &mid->wd; + wdt_dev->info = &mid_wdt_info; wdt_dev->ops = &mid_wdt_ops; wdt_dev->min_timeout = MID_WDT_TIMEOUT_MIN; @@ -135,7 +152,7 @@ static int mid_wdt_probe(struct platform_device *pdev) wdt_dev->parent = dev; watchdog_set_nowayout(wdt_dev, WATCHDOG_NOWAYOUT); - watchdog_set_drvdata(wdt_dev, dev); + watchdog_set_drvdata(wdt_dev, mid); ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog", @@ -145,6 +162,10 @@ static int mid_wdt_probe(struct platform_device *pdev) return ret; } + mid->scu = devm_intel_scu_ipc_dev_get(dev); + if (!mid->scu) + return -EPROBE_DEFER; + /* * The firmware followed by U-Boot leaves the watchdog running * with the default threshold which may vary. When we get here 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; } |