From: Fabio Estevam <feste...@denx.de> The DA9063 PMIC is a multi-function device that provides regulator, watchdog, RTC, and ON key functionalities.
Add support for the DA9063 PMIC watchdog functionality. Based on the 6.11 kernel drivers/watchdog/da9063_wdt.c driver. Signed-off-by: Fabio Estevam <feste...@denx.de> --- Changes since v2: - Use u8 instead of char. (Stefan) - Keep the Copyright header from Linux. (Stfan) drivers/power/pmic/da9063.c | 12 ++- drivers/watchdog/Kconfig | 6 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/da9063-wdt.c | 149 ++++++++++++++++++++++++++++++++++ 4 files changed, 166 insertions(+), 2 deletions(-) create mode 100644 drivers/watchdog/da9063-wdt.c diff --git a/drivers/power/pmic/da9063.c b/drivers/power/pmic/da9063.c index 7bd3df391421..59c65702863c 100644 --- a/drivers/power/pmic/da9063.c +++ b/drivers/power/pmic/da9063.c @@ -7,6 +7,9 @@ #include <fdtdec.h> #include <errno.h> #include <dm.h> +#include <dm/device-internal.h> +#include <dm/device_compat.h> +#include <dm/lists.h> #include <i2c.h> #include <log.h> #include <linux/printk.h> @@ -86,6 +89,7 @@ static int da9063_read(struct udevice *dev, uint reg, uint8_t *buff, int len) static int da9063_bind(struct udevice *dev) { ofnode regulators_node; + struct driver *drv; int children; regulators_node = dev_read_subnode(dev, "regulators"); @@ -101,8 +105,12 @@ static int da9063_bind(struct udevice *dev) if (!children) debug("%s: %s - no child found\n", __func__, dev->name); - /* Always return success for this device */ - return 0; + drv = lists_driver_lookup_name("da9063-wdt"); + if (!drv) + return 0; + + return device_bind_with_driver_data(dev, drv, "da9063-wdt", dev->driver_data, + dev_ofnode(dev), &dev); } static int da9063_probe(struct udevice *dev) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0c3e99133186..90bc5653ee33 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -169,6 +169,12 @@ config WDT_CORTINA This driver support all CPU ISAs supported by Cortina Access CAxxxx SoCs. +config WDT_DA9063 + bool "DA9063 watchdog timer support" + depends on WDT && DM_PMIC_DA9063 + help + Enable support for the watchdog timer in Dialog DA9063. + config WDT_GPIO bool "External gpio watchdog support" depends on WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 7b39adcf0ff4..6b564b7f96d2 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_WDT_BOOKE) += booke_wdt.o obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o obj-$(CONFIG_WDT_ORION) += orion_wdt.o obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o +obj-$(CONFIG_WDT_DA9063) += da9063-wdt.o obj-$(CONFIG_WDT_FTWDT010) += ftwdt010_wdt.o obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o diff --git a/drivers/watchdog/da9063-wdt.c b/drivers/watchdog/da9063-wdt.c new file mode 100644 index 000000000000..b7216b578630 --- /dev/null +++ b/drivers/watchdog/da9063-wdt.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Based on the Linux drivers/watchdog/da9063_wdt.c file. + * + * Watchdog driver for DA9063 PMICs. + * + * Copyright(c) 2012 Dialog Semiconductor Ltd. + * + * Author: Mariusz Wojtasik <mariusz.wojta...@diasemi.com> + * + * Ported to U-Boot by Fabio Estevam <feste...@denx.de> + * + */ + +#include <dm.h> +#include <dm/device-internal.h> +#include <dm/device_compat.h> +#include <dm/lists.h> +#include <i2c.h> +#include <linux/delay.h> +#include <wdt.h> + +#define DA9063_REG_CONTROL_D 0x11 +/* DA9063_REG_CONTROL_D (addr=0x11) */ +#define DA9063_TWDSCALE_MASK 0x0 +#define DA9063_TWDSCALE_DISABLE 0 +#define DA9063_REG_CONTROL_F 0x13 +/* DA9063_REG_CONTROL_F (addr=0x13) */ +#define DA9063_WATCHDOG 0x01 +#define DA9063_SHUTDOWN 0x02 + +/* + * Watchdog selector to timeout in seconds. + * 0: WDT disabled; + * others: timeout = 2048 ms * 2^(TWDSCALE-1). + */ +static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; + +#define DA9063_TWDSCALE_DISABLE 0 +#define DA9063_TWDSCALE_MIN 1 +#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1) + +static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) +{ + unsigned int i; + + for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) { + if (wdt_timeout[i] >= secs) + return i; + } + + return DA9063_TWDSCALE_MAX; +} + +static int da9063_read(struct udevice *dev, uint reg, uint8_t *buff, int len) +{ + return dm_i2c_read(dev->parent, reg, buff, len); +} + +static int da9063_write(struct udevice *dev, uint reg, const u8 *buff, int len) +{ + return dm_i2c_write(dev->parent, reg, buff, len); +} + +static int da9063_wdt_disable_timer(struct udevice *dev) +{ + u8 val; + + da9063_read(dev, DA9063_REG_CONTROL_D, &val, 1); + val &= ~DA9063_TWDSCALE_MASK; + val |= DA9063_TWDSCALE_DISABLE; + da9063_write(dev, DA9063_REG_CONTROL_D, &val, 1); + + return 0; +} + +static int da9063_wdt_update_timeout(struct udevice *dev, unsigned int timeout) +{ + unsigned int regval; + int ret; + u8 val; + + /* + * The watchdog triggers a reboot if a timeout value is already + * programmed because the timeout value combines two functions + * in one: indicating the counter limit and starting the watchdog. + * The watchdog must be disabled to be able to change the timeout + * value if the watchdog is already running. Then we can set the + * new timeout value which enables the watchdog again. + */ + ret = da9063_wdt_disable_timer(dev); + if (ret) + return ret; + + udelay(300); + + regval = da9063_wdt_timeout_to_sel(timeout); + + da9063_read(dev, DA9063_REG_CONTROL_D, &val, 1); + val &= ~DA9063_TWDSCALE_MASK; + val |= regval; + da9063_write(dev, DA9063_REG_CONTROL_D, &val, 1); + + return 0; +} + +static int da9063_wdt_start(struct udevice *dev, u64 timeout, ulong flags) +{ + return da9063_wdt_update_timeout(dev, timeout); +} + +static int da9063_wdt_stop(struct udevice *dev) +{ + return da9063_wdt_disable_timer(dev); +} + +static int da9063_wdt_reset(struct udevice *dev) +{ + u8 val = DA9063_WATCHDOG; + + return da9063_write(dev, DA9063_REG_CONTROL_F, &val, 1); +} + +static int da9063_wdt_expire_now(struct udevice *dev, ulong flags) +{ + u8 val = DA9063_SHUTDOWN; + + return da9063_write(dev, DA9063_REG_CONTROL_F, &val, 1); +} + +static const struct wdt_ops da9063_wdt_ops = { + .start = da9063_wdt_start, + .stop = da9063_wdt_stop, + .reset = da9063_wdt_reset, + .expire_now = da9063_wdt_expire_now, +}; + +static const struct udevice_id da9063_wdt_ids[] = { + { .compatible = "dlg,da9063-watchdog", }, + {} +}; + +U_BOOT_DRIVER(da9063_wdt) = { + .name = "da9063-wdt", + .id = UCLASS_WDT, + .of_match = da9063_wdt_ids, + .ops = &da9063_wdt_ops, + .flags = DM_FLAG_PROBE_AFTER_BIND, +}; -- 2.34.1