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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.7 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 2/2] Add Ricoh RN5T568 PMIC based watchdog X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) --- drivers/watchdog/Kconfig | 6 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/rn5t568_wdt.c | 146 +++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 drivers/watchdog/rn5t568_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index d605e62..61a096b 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -109,6 +109,12 @@ config STPMIC1_WATCHDOG help Enable to support configuration of the stpmic1's built-in watchdog. +config RN568_WATCHDOG + bool "Ricoh RN5t568 PMIC based Watchdog" + depends on MFD_RN568PMIC + help + Enable to support system control via the PMIC based watchdog. + config F71808E_WDT bool "Fintek F718xx, F818xx Super I/O Watchdog" depends on X86 diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index dbb76a5..84fd2bf 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_ARCH_BCM283X) += bcm2835_wdt.o obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o obj-$(CONFIG_STM32_IWDG_WATCHDOG) += stm32_iwdg.o obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o +obj-$(CONFIG_RN568_WATCHDOG) += rn5t568_wdt.o obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o obj-$(CONFIG_ITCO_WDT) += itco_wdt.o diff --git a/drivers/watchdog/rn5t568_wdt.c b/drivers/watchdog/rn5t568_wdt.c new file mode 100644 index 0000000..6308e1e --- /dev/null +++ b/drivers/watchdog/rn5t568_wdt.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Watchdog driver for Ricoh RN5T618 PMIC + * + * Copyright (C) 2014 Beniamino Galvani + */ + +#include +#include +#include +#include +#include + +#define RN5T568_WATCHDOG 0x0b +# define RN5T568_WATCHDOG_WDPWROFFEN BIT(2) +# define RN5T568_WATCHDOG_WDOGTIM_M (BIT(0) | BIT(1)) +#define RN5T568_PWRIREN 0x12 +# define RN5T568_PWRIREN_EN_WDOG BIT(6) +#define RN5T568_PWRIRQ 0x13 +# define RN5T568_PWRIRQ_IR_WDOG BIT(6) + +struct rn5t568_wdt { + struct watchdog wdd; + struct regmap *regmap; + unsigned int timeout; +}; + +struct rn5t568_wdt_tim { + u8 reg_val; + u8 time; +}; + +static const struct rn5t568_wdt_tim rn5t568_wdt_timeout[] = { + { .reg_val = 0, .time = 1, }, + { .reg_val = 1, .time = 8, }, + { .reg_val = 2, .time = 32, }, + { .reg_val = 3, .time = 128, }, +}; + +#define PMIC_WDT_MAX_TIMEOUT 128 + +static int rn5t568_wdt_start(struct regmap *regmap, int idx) +{ + int ret; + + ret = regmap_update_bits(regmap, RN5T568_WATCHDOG, RN5T568_WATCHDOG_WDOGTIM_M, + rn5t568_wdt_timeout[idx].reg_val); + if (ret) + return ret; + + regmap_update_bits(regmap, RN5T568_PWRIRQ, RN5T568_PWRIRQ_IR_WDOG, 0x00); + regmap_update_bits(regmap, RN5T568_PWRIREN, RN5T568_PWRIREN_EN_WDOG, RN5T568_PWRIREN_EN_WDOG); + + pr_debug("RN5t: Starting the watchdog with %u seconds\n", rn5t568_wdt_timeout[idx].time); + + return regmap_update_bits(regmap, RN5T568_WATCHDOG, RN5T568_WATCHDOG_WDPWROFFEN, + RN5T568_WATCHDOG_WDPWROFFEN); +} + +static int rn5t568_wdt_stop(struct regmap *regmap) +{ + int ret; + + ret = regmap_update_bits(regmap, RN5T568_PWRIREN, RN5T568_PWRIREN_EN_WDOG, 0); + if (ret) + return ret; + return regmap_update_bits(regmap, RN5T568_WATCHDOG, RN5T568_WATCHDOG_WDPWROFFEN, 0); +} + +static int rn5t568_wdt_ping(struct regmap *regmap) +{ + unsigned int val; + int ret; + + ret = regmap_read(regmap, RN5T568_WATCHDOG, &val); + if (ret) + return ret; + + return regmap_write(regmap, RN5T568_WATCHDOG, val); +} + +static int rn5t568_wdt_set_timeout(struct watchdog *wdd, unsigned int timeout) +{ + struct rn5t568_wdt *wdt = container_of(wdd, struct rn5t568_wdt, wdd); + int ret, i; + + if (!timeout) + return rn5t568_wdt_stop(wdt->regmap); + + for (i = 0; i < ARRAY_SIZE(rn5t568_wdt_timeout); i++) { + if (timeout < rn5t568_wdt_timeout[i].time) + break; + } + + if (i == ARRAY_SIZE(rn5t568_wdt_timeout)) + return -EINVAL; + + if (wdt->timeout == timeout) + return rn5t568_wdt_ping(wdt->regmap); + + ret = rn5t568_wdt_start(wdt->regmap, i); + if (ret) + return ret; + + wdt->timeout = rn5t568_wdt_timeout[i].time; + + return ret; +} + +static int rn5t568_wdt_probe(struct device_d *dev) +{ + struct rn5t568_wdt *wdt; + struct watchdog *wdd; + unsigned int val; + int ret; + + wdt = xzalloc(sizeof(*wdt)); + + wdt->regmap = dev_get_regmap(dev->parent, NULL); + if (IS_ERR(wdt->regmap)) + return PTR_ERR(wdt->regmap); + + wdd = &wdt->wdd; + wdd->hwdev = dev; + wdd->set_timeout = rn5t568_wdt_set_timeout; + wdd->timeout_max = PMIC_WDT_MAX_TIMEOUT; + + ret = regmap_read(wdt->regmap, RN5T568_WATCHDOG, &val); + if (ret == 0) + wdd->running = val & RN5T568_WATCHDOG_WDPWROFFEN ? + WDOG_HW_RUNNING : WDOG_HW_NOT_RUNNING; + + return watchdog_register(wdd); +} + +static __maybe_unused const struct of_device_id rn5t568_wdt_of_match[] = { + { .compatible = "ricoh,rn5t568-wdt" }, + { /* sentinel */ } +}; + +static struct driver_d rn5t568_wdt_driver = { + .name = "rn5t568-wdt", + .probe = rn5t568_wdt_probe, + .of_compatible = DRV_OF_COMPAT(rn5t568_wdt_of_match), +}; +device_platform_driver(rn5t568_wdt_driver); -- 2.30.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox