[PATCH v2] watchdog: ftwdt010: return a previously deleted driver now ported to DM
Stefan Roese
sr at denx.de
Thu Apr 20 12:01:03 CEST 2023
On 4/12/23 13:01, Sergei Antonov wrote:
> The ftwdt010 watchdog driver was deleted by
> commit 11232139e399 ("nds32: Remove the architecture")
>
> Return it to the codebase in a DM compatible form. Enable it in
> sandbox_defconfig to test compilability.
> Another platform using ftwdt010 will be submitted later.
>
> Signed-off-by: Sergei Antonov <saproj at gmail.com>
> Reviewed-by: Stefan Roese <sr at denx.de>
Applied to u-boot-watchdog/master
Thanks,
Stefan
> ---
>
> v2:
> * "imply WATCHDOG" in Kconfig like other watchdog drivers do
> * (by Stefan Roese) make .compatible string the same as in Linux driver
>
> configs/sandbox_defconfig | 1 +
> drivers/watchdog/Kconfig | 7 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/ftwdt010_wdt.c | 132 ++++++++++++++++++++++++++++++++
> include/faraday/ftwdt010_wdt.h | 3 -
> 5 files changed, 141 insertions(+), 3 deletions(-)
> create mode 100644 drivers/watchdog/ftwdt010_wdt.c
>
> diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
> index cbace259f8..1025aa9fe9 100644
> --- a/configs/sandbox_defconfig
> +++ b/configs/sandbox_defconfig
> @@ -322,6 +322,7 @@ CONFIG_WDT=y
> CONFIG_WDT_GPIO=y
> CONFIG_WDT_SANDBOX=y
> CONFIG_WDT_ALARM_SANDBOX=y
> +CONFIG_WDT_FTWDT010=y
> CONFIG_FS_CBFS=y
> CONFIG_FS_CRAMFS=y
> CONFIG_ADDR_MAP=y
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index b5ac8f7f50..8f78df509a 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -359,4 +359,11 @@ config SPL_WDT
> Enable driver model for watchdog timer in SPL.
> This is similar to CONFIG_WDT in U-Boot.
>
> +config WDT_FTWDT010
> + bool "Faraday Technology ftwdt010 watchdog timer support"
> + depends on WDT
> + imply WATCHDOG
> + help
> + Faraday Technology ftwdt010 watchdog is an architecture independent
> + watchdog. It is usually used in SoC chip design.
> endmenu
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 446d961d7d..fffa338bef 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -26,6 +26,7 @@ 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-$(CONFIG_WDT_FTWDT010) += ftwdt010_wdt.o
> obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o
> obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o
> obj-$(CONFIG_WDT_MESON_GXBB) += meson_gxbb_wdt.o
> diff --git a/drivers/watchdog/ftwdt010_wdt.c b/drivers/watchdog/ftwdt010_wdt.c
> new file mode 100644
> index 0000000000..a6b33b1720
> --- /dev/null
> +++ b/drivers/watchdog/ftwdt010_wdt.c
> @@ -0,0 +1,132 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Watchdog driver for the FTWDT010 Watch Dog Driver
> + *
> + * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
> + * Based on sa1100_wdt.c by Oleg Drokin <green at crimea.edu>
> + * Based on SoftDog driver by Alan Cox <alan at redhat.com>
> + *
> + * Copyright (C) 2011 Andes Technology Corporation
> + * Macpaul Lin, Andes Technology Corporation <macpaul at andestech.com>
> + *
> + * 27/11/2004 Initial release, Faraday.
> + * 12/01/2011 Port to u-boot, Macpaul Lin.
> + * 22/08/2022 Port to DM
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <wdt.h>
> +#include <log.h>
> +#include <asm/io.h>
> +#include <faraday/ftwdt010_wdt.h>
> +
> +struct ftwdt010_wdt_priv {
> + struct ftwdt010_wdt __iomem *regs;
> +};
> +
> +/*
> + * Set the watchdog time interval.
> + * Counter is 32 bit.
> + */
> +static int ftwdt010_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
> +{
> + struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
> + struct ftwdt010_wdt *wd = priv->regs;
> + unsigned int reg;
> +
> + debug("Activating WDT %llu ms\n", timeout_ms);
> +
> + /* Check if disabled */
> + if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
> + printf("sorry, watchdog is disabled\n");
> + return -1;
> + }
> +
> + /*
> + * In a 66MHz system,
> + * if you set WDLOAD as 0x03EF1480 (66000000)
> + * the reset timer is 1 second.
> + */
> + reg = FTWDT010_WDLOAD(timeout_ms * FTWDT010_TIMEOUT_FACTOR);
> +
> + writel(reg, &wd->wdload);
> +
> + return 0;
> +}
> +
> +static int ftwdt010_wdt_reset(struct udevice *dev)
> +{
> + struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
> + struct ftwdt010_wdt *wd = priv->regs;
> +
> + /* clear control register */
> + writel(0, &wd->wdcr);
> +
> + /* Write Magic number */
> + writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
> +
> + /* Enable WDT */
> + writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
> +
> + return 0;
> +}
> +
> +static int ftwdt010_wdt_stop(struct udevice *dev)
> +{
> + struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
> + struct ftwdt010_wdt *wd = priv->regs;
> +
> + debug("Deactivating WDT..\n");
> +
> + /*
> + * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
> + *
> + * Shut off the timer.
> + * Lock it in if it's a module and we defined ...NOWAYOUT
> + */
> + writel(0, &wd->wdcr);
> + return 0;
> +}
> +
> +static int ftwdt010_wdt_expire_now(struct udevice *dev, ulong flags)
> +{
> + struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
> + struct ftwdt010_wdt *wd = priv->regs;
> +
> + debug("Expiring WDT..\n");
> + writel(FTWDT010_WDLOAD(0), &wd->wdload);
> + return ftwdt010_wdt_reset(dev);
> +}
> +
> +static int ftwdt010_wdt_probe(struct udevice *dev)
> +{
> + struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
> +
> + priv->regs = dev_read_addr_ptr(dev);
> + if (!priv->regs)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static const struct wdt_ops ftwdt010_wdt_ops = {
> + .start = ftwdt010_wdt_start,
> + .reset = ftwdt010_wdt_reset,
> + .stop = ftwdt010_wdt_stop,
> + .expire_now = ftwdt010_wdt_expire_now,
> +};
> +
> +static const struct udevice_id ftwdt010_wdt_ids[] = {
> + { .compatible = "faraday,ftwdt010" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(ftwdt010_wdt) = {
> + .name = "ftwdt010_wdt",
> + .id = UCLASS_WDT,
> + .of_match = ftwdt010_wdt_ids,
> + .ops = &ftwdt010_wdt_ops,
> + .probe = ftwdt010_wdt_probe,
> + .priv_auto = sizeof(struct ftwdt010_wdt_priv),
> +};
> diff --git a/include/faraday/ftwdt010_wdt.h b/include/faraday/ftwdt010_wdt.h
> index 804907d645..d4c11e39a0 100644
> --- a/include/faraday/ftwdt010_wdt.h
> +++ b/include/faraday/ftwdt010_wdt.h
> @@ -89,7 +89,4 @@ struct ftwdt010_wdt {
> */
> #define FTWDT010_TIMEOUT_FACTOR (get_board_sys_clk() / 1000) /* 1 ms */
>
> -void ftwdt010_wdt_reset(void);
> -void ftwdt010_wdt_disable(void);
> -
> #endif /* __FTWDT010_H */
Viele Grüße,
Stefan Roese
--
DENX Software Engineering GmbH, Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de
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