lkml.org 
[lkml]   [2023]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Date
    Subject[PATCH v4 08/42] power: reset: Add a driver for the ep93xx reset
    From: Nikita Shubin <nikita.shubin@maquefel.me>

    Implement the reset behaviour of the various EP93xx SoCS in drivers/power/reset.

    It used to be located in arch/arm/mach-ep93xx.

    Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
    Acked-by: Sebastian Reichel <sre@kernel.org>
    ---
    drivers/power/reset/Kconfig | 10 +++++
    drivers/power/reset/Makefile | 1 +
    drivers/power/reset/ep93xx-restart.c | 85 ++++++++++++++++++++++++++++++++++++
    3 files changed, 96 insertions(+)

    diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
    index fff07b2bd77b..9c2aa9218841 100644
    --- a/drivers/power/reset/Kconfig
    +++ b/drivers/power/reset/Kconfig
    @@ -75,6 +75,16 @@ config POWER_RESET_BRCMSTB
    Say Y here if you have a Broadcom STB board and you wish
    to have restart support.

    +config POWER_RESET_EP93XX
    + bool "Cirrus EP93XX reset driver" if COMPILE_TEST
    + depends on MFD_SYSCON
    + default ARCH_EP93XX
    + help
    + This driver provides restart support for Cirrus EP93XX SoC.
    +
    + Say Y here if you have a Cirrus EP93XX SoC and you wish
    + to have restart support.
    +
    config POWER_RESET_GEMINI_POWEROFF
    bool "Cortina Gemini power-off driver"
    depends on ARCH_GEMINI || COMPILE_TEST
    diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
    index d763e6735ee3..61f4e11619b2 100644
    --- a/drivers/power/reset/Makefile
    +++ b/drivers/power/reset/Makefile
    @@ -7,6 +7,7 @@ obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o
    obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
    obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o
    obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
    +obj-$(CONFIG_POWER_RESET_EP93XX) += ep93xx-restart.o
    obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o
    obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
    obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
    diff --git a/drivers/power/reset/ep93xx-restart.c b/drivers/power/reset/ep93xx-restart.c
    new file mode 100644
    index 000000000000..4da456d45d29
    --- /dev/null
    +++ b/drivers/power/reset/ep93xx-restart.c
    @@ -0,0 +1,85 @@
    +// SPDX-License-Identifier: GPL-2.0+
    +/*
    + * Cirrus EP93xx SoC reset driver
    + *
    + * Copyright (C) 2021 Nikita Shubin <nikita.shubin@maquefel.me>
    + */
    +
    +#include <linux/bits.h>
    +#include <linux/delay.h>
    +#include <linux/mfd/syscon.h>
    +#include <linux/notifier.h>
    +#include <linux/of.h>
    +#include <linux/platform_device.h>
    +#include <linux/reboot.h>
    +
    +#include <linux/soc/cirrus/ep93xx.h>
    +
    +#define EP93XX_SYSCON_DEVCFG 0x80
    +#define EP93XX_SYSCON_DEVCFG_SWRST BIT(31)
    +
    +struct ep93xx_restart {
    + struct regmap *map;
    + struct notifier_block restart_handler;
    +};
    +
    +static int ep93xx_restart_handle(struct notifier_block *this,
    + unsigned long mode, void *cmd)
    +{
    + struct ep93xx_restart *priv =
    + container_of(this, struct ep93xx_restart, restart_handler);
    +
    + /* Issue the reboot */
    + ep93xx_regmap_update_bits(priv->map, EP93XX_SYSCON_DEVCFG,
    + EP93XX_SYSCON_DEVCFG_SWRST, EP93XX_SYSCON_DEVCFG_SWRST);
    + ep93xx_regmap_update_bits(priv->map, EP93XX_SYSCON_DEVCFG,
    + EP93XX_SYSCON_DEVCFG_SWRST, 0);
    +
    + return NOTIFY_DONE;
    +}
    +
    +static int ep93xx_reboot_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct ep93xx_restart *priv;
    + struct device_node *parent;
    + int err;
    +
    + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
    + if (!priv)
    + return -ENOMEM;
    +
    + parent = of_get_parent(dev->of_node);
    + if (!parent)
    + return dev_err_probe(dev, -EINVAL, "no syscon parent for reboot node\n");
    +
    + priv->map = syscon_node_to_regmap(parent);
    + of_node_put(parent);
    + if (IS_ERR(priv->map))
    + return dev_err_probe(dev, -EINVAL, "no syscon regmap\n");
    +
    + priv->restart_handler.notifier_call = ep93xx_restart_handle;
    + priv->restart_handler.priority = 128;
    +
    + err = register_restart_handler(&priv->restart_handler);
    + if (err)
    + return dev_err_probe(dev, err, "can't register restart notifier\n");
    +
    + return 0;
    +}
    +
    +static const struct of_device_id ep93xx_reboot_of_match[] = {
    + {
    + .compatible = "cirrus,ep9301-reboot",
    + },
    + { /* sentinel */ }
    +};
    +
    +static struct platform_driver ep93xx_reboot_driver = {
    + .probe = ep93xx_reboot_probe,
    + .driver = {
    + .name = "ep9301-reboot",
    + .of_match_table = ep93xx_reboot_of_match,
    + },
    +};
    +builtin_platform_driver(ep93xx_reboot_driver);
    --
    2.39.2

    \
     
     \ /
      Last update: 2023-09-15 10:13    [W:3.234 / U:0.040 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site