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 <[email protected]>
---
drivers/power/reset/Kconfig | 10 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/ep93xx-restart.c | 65 ++++++++++++++++++++++++++++
3 files changed, 76 insertions(+)
create mode 100644 drivers/power/reset/ep93xx-restart.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 8c87eeda0fec..2a61afbb047b 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..0dab09d4fd3c
--- /dev/null
+++ b/drivers/power/reset/ep93xx-restart.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: (GPL-2.0)
+/*
+ * Cirrus EP93xx SoC reset driver
+ *
+ * Copyright (C) 2021 Nikita Shubin <[email protected]>
+ */
+
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+
+#include <linux/soc/cirrus/ep93xx.h>
+
+#define EP93XX_SYSCON_DEVCFG_SWRST BIT(31)
+
+static int ep93xx_restart_handle(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ /* Issue the reboot */
+ ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_SWRST, 0x00);
+ ep93xx_devcfg_set_clear(0x00, EP93XX_SYSCON_DEVCFG_SWRST);
+
+ mdelay(1000);
+
+ pr_emerg("Unable to restart system\n");
+ return NOTIFY_DONE;
+}
+
+static int ep93xx_reboot_probe(struct platform_device *pdev)
+{
+ struct notifier_block *res_han;
+ struct device *dev = &pdev->dev;
+ int err;
+
+ res_han = devm_kzalloc(&pdev->dev, sizeof(*res_han), GFP_KERNEL);
+ if (!res_han)
+ return -ENOMEM;
+
+ res_han->notifier_call = ep93xx_restart_handle;
+ res_han->priority = 128;
+
+ err = register_restart_handler(res_han);
+ if (err)
+ dev_err(dev, "can't register restart notifier (err=%d)\n", err);
+
+ return err;
+}
+
+static const struct of_device_id ep93xx_reboot_of_match[] = {
+ {
+ .compatible = "cirrus,ep9301-reboot",
+ },
+ {}
+};
+
+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
Hi,
On Mon, Apr 24, 2023 at 03:34:29PM +0300, Nikita Shubin wrote:
> 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 <[email protected]>
> ---
Acked-by: Sebastian Reichel <[email protected]>
-- Sebastian
> drivers/power/reset/Kconfig | 10 +++++
> drivers/power/reset/Makefile | 1 +
> drivers/power/reset/ep93xx-restart.c | 65 ++++++++++++++++++++++++++++
> 3 files changed, 76 insertions(+)
> create mode 100644 drivers/power/reset/ep93xx-restart.c
>
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index 8c87eeda0fec..2a61afbb047b 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..0dab09d4fd3c
> --- /dev/null
> +++ b/drivers/power/reset/ep93xx-restart.c
> @@ -0,0 +1,65 @@
> +// SPDX-License-Identifier: (GPL-2.0)
> +/*
> + * Cirrus EP93xx SoC reset driver
> + *
> + * Copyright (C) 2021 Nikita Shubin <[email protected]>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/notifier.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +
> +#include <linux/soc/cirrus/ep93xx.h>
> +
> +#define EP93XX_SYSCON_DEVCFG_SWRST BIT(31)
> +
> +static int ep93xx_restart_handle(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + /* Issue the reboot */
> + ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_SWRST, 0x00);
> + ep93xx_devcfg_set_clear(0x00, EP93XX_SYSCON_DEVCFG_SWRST);
> +
> + mdelay(1000);
> +
> + pr_emerg("Unable to restart system\n");
> + return NOTIFY_DONE;
> +}
> +
> +static int ep93xx_reboot_probe(struct platform_device *pdev)
> +{
> + struct notifier_block *res_han;
> + struct device *dev = &pdev->dev;
> + int err;
> +
> + res_han = devm_kzalloc(&pdev->dev, sizeof(*res_han), GFP_KERNEL);
> + if (!res_han)
> + return -ENOMEM;
> +
> + res_han->notifier_call = ep93xx_restart_handle;
> + res_han->priority = 128;
> +
> + err = register_restart_handler(res_han);
> + if (err)
> + dev_err(dev, "can't register restart notifier (err=%d)\n", err);
> +
> + return err;
> +}
> +
> +static const struct of_device_id ep93xx_reboot_of_match[] = {
> + {
> + .compatible = "cirrus,ep9301-reboot",
> + },
> + {}
> +};
> +
> +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
>