Messages in this thread | | | Subject | Re: [PATCH v10 8/9] watchdog: bd70528: Initial support for ROHM BD70528 watchdog block | From | Guenter Roeck <> | Date | Thu, 14 Feb 2019 06:16:18 -0800 |
| |
On 2/14/19 5:12 AM, Matti Vaittinen wrote: > Initial support for watchdog block included in ROHM BD70528 > power management IC. > > Configurations for low power states are still to be checked. > > Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
> --- > > I dropped the Ack from Guenter as removal of struct bd70528 > somewhat changed the code > > drivers/watchdog/Kconfig | 12 +++ > drivers/watchdog/Makefile | 1 + > drivers/watchdog/bd70528_wdt.c | 187 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 200 insertions(+) > create mode 100644 drivers/watchdog/bd70528_wdt.c > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 57f017d74a97..f30e3a3e886e 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -90,6 +90,18 @@ config SOFT_WATCHDOG_PRETIMEOUT > watchdog. Be aware that governors might affect the watchdog because it > is purely software, e.g. the panic governor will stall it! > > +config BD70528_WATCHDOG > + tristate "ROHM BD70528 PMIC Watchdog" > + depends on MFD_ROHM_BD70528 > + select WATCHDOG_CORE > + help > + Support for the watchdog in the ROHM BD70528 PMIC. Watchdog trigger > + cause system reset. > + > + Say Y here to include support for the ROHM BD70528 watchdog. > + Alternatively say M to compile the driver as a module, > + which will be called bd70528_wdt. > + > config DA9052_WATCHDOG > tristate "Dialog DA9052 Watchdog" > depends on PMIC_DA9052 || COMPILE_TEST > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index a0917ef28e07..1ce87a3b1172 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -204,6 +204,7 @@ obj-$(CONFIG_WATCHDOG_SUN4V) += sun4v_wdt.o > obj-$(CONFIG_XEN_WDT) += xen_wdt.o > > # Architecture Independent > +obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o > obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o > obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o > obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o > diff --git a/drivers/watchdog/bd70528_wdt.c b/drivers/watchdog/bd70528_wdt.c > new file mode 100644 > index 000000000000..c014c915932a > --- /dev/null > +++ b/drivers/watchdog/bd70528_wdt.c > @@ -0,0 +1,187 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 ROHM Semiconductors > +// ROHM BD70528MWV watchdog driver > + > +#include <linux/bcd.h> > +#include <linux/kernel.h> > +#include <linux/mfd/rohm-bd70528.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/watchdog.h> > + > +/* > + * Max time we can set is 1 hour, 59 minutes and 59 seconds > + * and Minimum time is 1 second > + */ > +#define WDT_MAX_MS ((2 * 60 * 60 - 1) * 1000) > +#define WDT_MIN_MS 1000 > +#define DEFAULT_TIMEOUT 60 > + > +struct wdtbd70528 { > + struct device *dev; > + struct regmap *regmap; > + struct rohm_regmap_dev *mfd; > + struct watchdog_device wdt; > +}; > + > +static int bd70528_wdt_set_locked(struct wdtbd70528 *w, int enable) > +{ > + return bd70528_wdt_set(w->mfd, enable, NULL); > +} > + > +static int bd70528_wdt_change(struct wdtbd70528 *w, int enable) > +{ > + int ret; > + > + bd70528_wdt_lock(w->mfd); > + ret = bd70528_wdt_set_locked(w, enable); > + bd70528_wdt_unlock(w->mfd); > + > + return ret; > +} > + > +static int bd70528_wdt_start(struct watchdog_device *wdt) > +{ > + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); > + > + dev_dbg(w->dev, "WDT ping...\n"); > + return bd70528_wdt_change(w, 1); > +} > + > +static int bd70528_wdt_stop(struct watchdog_device *wdt) > +{ > + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); > + > + dev_dbg(w->dev, "WDT stopping...\n"); > + return bd70528_wdt_change(w, 0); > +} > + > +static int bd70528_wdt_set_timeout(struct watchdog_device *wdt, > + unsigned int timeout) > +{ > + unsigned int hours; > + unsigned int minutes; > + unsigned int seconds; > + int ret; > + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); > + > + seconds = timeout; > + hours = timeout / (60 * 60); > + /* Maximum timeout is 1h 59m 59s => hours is 1 or 0 */ > + if (hours) > + seconds -= (60 * 60); > + minutes = seconds / 60; > + seconds = seconds % 60; > + > + bd70528_wdt_lock(w->mfd); > + > + ret = bd70528_wdt_set_locked(w, 0); > + if (ret) > + goto out_unlock; > + > + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_HOUR, > + BD70528_MASK_WDT_HOUR, hours); > + if (ret) { > + dev_err(w->dev, "Failed to set WDT hours\n"); > + goto out_en_unlock; > + } > + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_MINUTE, > + BD70528_MASK_WDT_MINUTE, bin2bcd(minutes)); > + if (ret) { > + dev_err(w->dev, "Failed to set WDT minutes\n"); > + goto out_en_unlock; > + } > + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_SEC, > + BD70528_MASK_WDT_SEC, bin2bcd(seconds)); > + if (ret) > + dev_err(w->dev, "Failed to set WDT seconds\n"); > + else > + dev_dbg(w->dev, "WDT tmo set to %u\n", timeout); > + > +out_en_unlock: > + ret = bd70528_wdt_set_locked(w, 1); > +out_unlock: > + bd70528_wdt_unlock(w->mfd); > + > + return ret; > +} > + > +static const struct watchdog_info bd70528_wdt_info = { > + .identity = "bd70528-wdt", > + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, > +}; > + > +static const struct watchdog_ops bd70528_wdt_ops = { > + .start = bd70528_wdt_start, > + .stop = bd70528_wdt_stop, > + .set_timeout = bd70528_wdt_set_timeout, > +}; > + > +static int bd70528_wdt_probe(struct platform_device *pdev) > +{ > + struct rohm_regmap_dev *bd70528; > + struct wdtbd70528 *w; > + int ret; > + unsigned int reg; > + > + bd70528 = dev_get_drvdata(pdev->dev.parent); > + if (!bd70528) { > + dev_err(&pdev->dev, "No MFD driver data\n"); > + return -EINVAL; > + } > + w = devm_kzalloc(&pdev->dev, sizeof(*w), GFP_KERNEL); > + if (!w) > + return -ENOMEM; > + > + w->regmap = bd70528->regmap; > + w->mfd = bd70528; > + w->dev = &pdev->dev; > + > + w->wdt.info = &bd70528_wdt_info; > + w->wdt.ops = &bd70528_wdt_ops; > + w->wdt.min_hw_heartbeat_ms = WDT_MIN_MS; > + w->wdt.max_hw_heartbeat_ms = WDT_MAX_MS; > + w->wdt.parent = pdev->dev.parent; > + w->wdt.timeout = DEFAULT_TIMEOUT; > + watchdog_set_drvdata(&w->wdt, w); > + watchdog_init_timeout(&w->wdt, 0, pdev->dev.parent); > + > + ret = bd70528_wdt_set_timeout(&w->wdt, w->wdt.timeout); > + if (ret) { > + dev_err(&pdev->dev, "Failed to set the watchdog timeout\n"); > + return ret; > + } > + > + bd70528_wdt_lock(w->mfd); > + ret = regmap_read(w->regmap, BD70528_REG_WDT_CTRL, ®); > + bd70528_wdt_unlock(w->mfd); > + > + if (ret) { > + dev_err(&pdev->dev, "Failed to get the watchdog state\n"); > + return ret; > + } > + if (reg & BD70528_MASK_WDT_EN) { > + dev_dbg(&pdev->dev, "watchdog was running during probe\n"); > + set_bit(WDOG_HW_RUNNING, &w->wdt.status); > + } > + > + ret = devm_watchdog_register_device(&pdev->dev, &w->wdt); > + if (ret < 0) > + dev_err(&pdev->dev, "watchdog registration failed: %d\n", ret); > + > + return ret; > +} > +static struct platform_driver bd70528_wdt = { > + .driver = { > + .name = "bd70528-wdt" > + }, > + .probe = bd70528_wdt_probe, > +}; > + > +module_platform_driver(bd70528_wdt); > + > +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); > +MODULE_DESCRIPTION("BD70528 watchdog driver"); > +MODULE_LICENSE("GPL"); >
| |