[PATCH 1/2] watchdog: implement bcm2835 watchdog
Sascha Hauer
s.hauer at pengutronix.de
Fri Feb 9 00:30:38 PST 2018
On Tue, Feb 06, 2018 at 10:11:14PM +0100, Lucas Stach wrote:
> Move out of architecture code and add some real watchdog functionality.
>
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
> arch/arm/mach-bcm283x/Makefile | 2 +-
> arch/arm/mach-bcm283x/include/mach/wd.h | 47 -----------
> arch/arm/mach-bcm283x/wd.c | 75 -----------------
> drivers/watchdog/Kconfig | 6 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/bcm2835_wdt.c | 141 ++++++++++++++++++++++++++++++++
> 6 files changed, 149 insertions(+), 123 deletions(-)
> delete mode 100644 arch/arm/mach-bcm283x/include/mach/wd.h
> delete mode 100644 arch/arm/mach-bcm283x/wd.c
> create mode 100644 drivers/watchdog/bcm2835_wdt.c
>
Applied, thanks
Sascha
> diff --git a/arch/arm/mach-bcm283x/Makefile b/arch/arm/mach-bcm283x/Makefile
> index 96ea69365..940f98cbc 100644
> --- a/arch/arm/mach-bcm283x/Makefile
> +++ b/arch/arm/mach-bcm283x/Makefile
> @@ -1 +1 @@
> -obj-y += core.o mbox.o wd.o
> +obj-y += core.o mbox.o
> diff --git a/arch/arm/mach-bcm283x/include/mach/wd.h b/arch/arm/mach-bcm283x/include/mach/wd.h
> deleted file mode 100644
> index cdd22d48c..000000000
> --- a/arch/arm/mach-bcm283x/include/mach/wd.h
> +++ /dev/null
> @@ -1,47 +0,0 @@
> -/*
> - * Extract from arch/arm/mach-bcm2708/include/mach/platform.h
> - *
> - * Copyright (C) 2010 Broadcom
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - *
> - */
> -
> -#ifndef _WD_H
> -#define _WD_H
> -
> -/*
> - * Watchdog
> - */
> -#define PM_RSTC 0x1c
> -#define PM_RSTS 0x20
> -#define PM_WDOG 0x24
> -
> -#define PM_WDOG_RESET 0000000000
> -#define PM_PASSWORD 0x5a000000
> -#define PM_WDOG_TIME_SET 0x000fffff
> -#define PM_RSTC_WRCFG_CLR 0xffffffcf
> -#define PM_RSTC_WRCFG_SET 0x00000030
> -#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
> -#define PM_RSTC_RESET 0x00000102
> -
> -#define PM_RSTS_HADPOR_SET 0x00001000
> -#define PM_RSTS_HADSRH_SET 0x00000400
> -#define PM_RSTS_HADSRF_SET 0x00000200
> -#define PM_RSTS_HADSRQ_SET 0x00000100
> -#define PM_RSTS_HADWRH_SET 0x00000040
> -#define PM_RSTS_HADWRF_SET 0x00000020
> -#define PM_RSTS_HADWRQ_SET 0x00000010
> -#define PM_RSTS_HADDRH_SET 0x00000004
> -#define PM_RSTS_HADDRF_SET 0x00000002
> -#define PM_RSTS_HADDRQ_SET 0x00000001
> -
> -#endif
> diff --git a/arch/arm/mach-bcm283x/wd.c b/arch/arm/mach-bcm283x/wd.c
> deleted file mode 100644
> index 5a5188fd2..000000000
> --- a/arch/arm/mach-bcm283x/wd.c
> +++ /dev/null
> @@ -1,75 +0,0 @@
> -/*
> - * Copyright (C) 2017 Pengutronix, Lucas Stach <l.stach at pengutronix.de>
> - *
> - * Based on code from Carlo Caione <carlo at carlocaione.org>
> - *
> - * This program is free software; you can redistribute it and/or
> - * modify it under the terms of the GNU General Public License as
> - * published by the Free Software Foundation; either version 2 of
> - * the License, or (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - *
> - */
> -#include <common.h>
> -#include <init.h>
> -#include <io.h>
> -#include <restart.h>
> -
> -#include <mach/wd.h>
> -
> -static void __iomem *wd_base;
> -
> -#define RESET_TIMEOUT 10
> -
> -static void __noreturn bcm2835_restart_soc(struct restart_handler *rst)
> -{
> - uint32_t rstc;
> -
> - rstc = readl(wd_base + PM_RSTC);
> - rstc &= ~PM_RSTC_WRCFG_SET;
> - rstc |= PM_RSTC_WRCFG_FULL_RESET;
> - writel(PM_PASSWORD | RESET_TIMEOUT, wd_base + PM_WDOG);
> - writel(PM_PASSWORD | rstc, wd_base + PM_RSTC);
> -
> - hang();
> -}
> -
> -static int bcm2835_wd_probe(struct device_d *dev)
> -{
> - struct resource *iores;
> -
> - iores = dev_request_mem_resource(dev, 0);
> - if (IS_ERR(iores)) {
> - dev_err(dev, "could not get memory region\n");
> - return PTR_ERR(iores);
> - }
> - wd_base = IOMEM(iores->start);
> -
> - restart_handler_register_fn(bcm2835_restart_soc);
> -
> - return 0;
> -}
> -
> -static __maybe_unused struct of_device_id bcm2835_wd_dt_ids[] = {
> - {
> - .compatible = "brcm,bcm2835-pm-wdt",
> - }, {
> - /* sentinel */
> - },
> -};
> -
> -static struct driver_d bcm2835_wd_driver = {
> - .name = "bcm2835_wd",
> - .of_compatible = DRV_OF_COMPAT(bcm2835_wd_dt_ids),
> - .probe = bcm2835_wd_probe,
> -};
> -
> -static int __init bcm2835_wd_init(void)
> -{
> - return platform_driver_register(&bcm2835_wd_driver);
> -}
> -device_initcall(bcm2835_wd_init);
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index a8f9492ac..3defb9da6 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -58,4 +58,10 @@ config WATCHDOG_ORION
> help
> Add support for watchdog on the Marvall Armada XP
>
> +config WATCHDOG_BCM2835
> + bool "Watchdog for BCM283x SoCs"
> + depends on ARCH_BCM283X
> + help
> + Add support for watchdog on the Broadcom BCM283X SoCs.
> +
> endif
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index c607f7509..237640121 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_WATCHDOG_DW) += dw_wdt.o
> obj-$(CONFIG_WATCHDOG_JZ4740) += jz4740.o
> obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o
> obj-$(CONFIG_WATCHDOG_ORION) += orion_wdt.o
> +obj-$(CONFIG_ARCH_BCM283X) += bcm2835_wdt.o
> diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c
> new file mode 100644
> index 000000000..457d86fc0
> --- /dev/null
> +++ b/drivers/watchdog/bcm2835_wdt.c
> @@ -0,0 +1,141 @@
> +/*
> + * Copyright (C) 2017 Pengutronix, Lucas Stach <l.stach at pengutronix.de>
> + *
> + * Based on code from Carlo Caione <carlo at carlocaione.org>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <common.h>
> +#include <init.h>
> +#include <io.h>
> +#include <restart.h>
> +#include <watchdog.h>
> +
> +#define PM_RSTC 0x1c
> +#define PM_RSTS 0x20
> +#define PM_WDOG 0x24
> +
> +#define PM_WDOG_RESET 0000000000
> +#define PM_PASSWORD 0x5a000000
> +#define PM_WDOG_TIME_SET 0x000fffff
> +#define PM_RSTC_WRCFG_CLR 0xffffffcf
> +#define PM_RSTC_WRCFG_SET 0x00000030
> +#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
> +#define PM_RSTC_RESET 0x00000102
> +
> +#define PM_RSTS_HADPOR_SET 0x00001000
> +#define PM_RSTS_HADSRH_SET 0x00000400
> +#define PM_RSTS_HADSRF_SET 0x00000200
> +#define PM_RSTS_HADSRQ_SET 0x00000100
> +#define PM_RSTS_HADWRH_SET 0x00000040
> +#define PM_RSTS_HADWRF_SET 0x00000020
> +#define PM_RSTS_HADWRQ_SET 0x00000010
> +#define PM_RSTS_HADDRH_SET 0x00000004
> +#define PM_RSTS_HADDRF_SET 0x00000002
> +#define PM_RSTS_HADDRQ_SET 0x00000001
> +
> +#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
> +
> +struct bcm2835_wd {
> + struct watchdog wd;
> + void __iomem *base;
> + struct device_d *dev;
> + struct restart_handler restart;
> +};
> +
> +#define RESET_TIMEOUT 10
> +
> +static void __noreturn bcm2835_restart_soc(struct restart_handler *rst)
> +{
> + struct bcm2835_wd *priv = container_of(rst, struct bcm2835_wd, restart);
> + uint32_t rstc;
> +
> + rstc = readl(priv->base + PM_RSTC);
> + rstc &= ~PM_RSTC_WRCFG_SET;
> + rstc |= PM_RSTC_WRCFG_FULL_RESET;
> + writel(PM_PASSWORD | RESET_TIMEOUT, priv->base + PM_WDOG);
> + writel(PM_PASSWORD | rstc, priv->base + PM_RSTC);
> +
> + hang();
> +}
> +
> +static int bcm2835_wd_set_timeout(struct watchdog *wd, unsigned timeout)
> +{
> + struct bcm2835_wd *priv = container_of(wd, struct bcm2835_wd, wd);
> + u32 val;
> +
> + if (!timeout) {
> + writel(PM_PASSWORD | PM_RSTC_RESET, priv->base + PM_RSTC);
> + return 0;
> + }
> +
> + writel(PM_PASSWORD | (SECS_TO_WDOG_TICKS(timeout) & PM_WDOG_TIME_SET),
> + priv->base + PM_WDOG);
> + val = readl(priv->base + PM_RSTC);
> + writel(PM_PASSWORD | (val & PM_RSTC_WRCFG_CLR) |
> + PM_RSTC_WRCFG_FULL_RESET, priv->base + PM_RSTC);
> +
> + return 0;
> +}
> +
> +static int bcm2835_wd_probe(struct device_d *dev)
> +{
> + struct resource *iores;
> + struct bcm2835_wd *priv;
> + int ret;
> +
> + priv = xzalloc(sizeof(*priv));
> + iores = dev_request_mem_resource(dev, 0);
> + if (IS_ERR(iores)) {
> + dev_err(dev, "could not get memory region\n");
> + return PTR_ERR(iores);
> + }
> + priv->base = IOMEM(iores->start);
> + priv->wd.set_timeout = bcm2835_wd_set_timeout;
> + priv->wd.dev = dev;
> + priv->dev = dev;
> +
> + if (IS_ENABLED(CONFIG_WATCHDOG_BCM2835)) {
> + ret = watchdog_register(&priv->wd);
> + if (ret) {
> + free(priv);
> + return ret;
> + }
> + }
> +
> + priv->restart.name = "bcm2835_wd";
> + priv->restart.restart = bcm2835_restart_soc;
> +
> + restart_handler_register(&priv->restart);
> +
> + return 0;
> +}
> +
> +static __maybe_unused struct of_device_id bcm2835_wd_dt_ids[] = {
> + {
> + .compatible = "brcm,bcm2835-pm-wdt",
> + }, {
> + /* sentinel */
> + },
> +};
> +
> +static struct driver_d bcm2835_wd_driver = {
> + .name = "bcm2835_wd",
> + .of_compatible = DRV_OF_COMPAT(bcm2835_wd_dt_ids),
> + .probe = bcm2835_wd_probe,
> +};
> +
> +static int __init bcm2835_wd_init(void)
> +{
> + return platform_driver_register(&bcm2835_wd_driver);
> +}
> +device_initcall(bcm2835_wd_init);
> --
> 2.14.3
>
>
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