| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20230605-ep93xx-v3-14-3d63a5f1103e@maquefel.me>
Date: Thu, 20 Jul 2023 14:29:14 +0300
From:
Nikita Shubin via B4 Relay <devnull+nikita.shubin.maquefel.me@...nel.org>
To: Hartley Sweeten <hsweeten@...ionengravers.com>,
Lennert Buytenhek <kernel@...tstofly.org>,
Alexander Sverdlin <alexander.sverdlin@...il.com>,
Russell King <linux@...linux.org.uk>, Lukasz Majewski <lukma@...x.de>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>, Nikita Shubin <nikita.shubin@...uefel.me>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>, Sebastian Reichel <sre@...nel.org>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Mark Brown <broonie@...nel.org>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Vinod Koul <vkoul@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
Damien Le Moal <dlemoal@...nel.org>, Sergey Shtylyov <s.shtylyov@....ru>,
Dmitry Torokhov <dmitry.torokhov@...il.com>, Arnd Bergmann <arnd@...db.de>,
Olof Johansson <olof@...om.net>, soc@...nel.org,
Liam Girdwood <lgirdwood@...il.com>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, Andy Shevchenko <andy@...nel.org>,
Michael Peters <mpeters@...eddedTS.com>, Kris Bahnsen <kris@...eddedTS.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
linux-clk@...r.kernel.org, linux-rtc@...r.kernel.org,
linux-watchdog@...r.kernel.org, linux-pm@...r.kernel.org,
linux-pwm@...r.kernel.org, linux-spi@...r.kernel.org,
netdev@...r.kernel.org, dmaengine@...r.kernel.org,
linux-mtd@...ts.infradead.org, linux-ide@...r.kernel.org,
linux-input@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH v3 14/42] power: reset: Add a driver for the ep93xx reset
From: Nikita Shubin <nikita.shubin@...uefel.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@...uefel.me>
Acked-by: Sebastian Reichel <sre@...nel.org>
---
drivers/power/reset/Kconfig | 10 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/ep93xx-restart.c | 86 ++++++++++++++++++++++++++++++++++++
3 files changed, 97 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..1f5be7de8719
--- /dev/null
+++ b/drivers/power/reset/ep93xx-restart.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: (GPL-2.0)
+/*
+ * Cirrus EP93xx SoC reset driver
+ *
+ * Copyright (C) 2021 Nikita Shubin <nikita.shubin@...uefel.me>
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.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)
+
+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_devcfg_set_clear(priv->map, EP93XX_SYSCON_DEVCFG_SWRST, 0x00);
+ ep93xx_devcfg_set_clear(priv->map, 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 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 err;
+}
+
+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);
+MODULE_IMPORT_NS(EP93XX_SOC);
--
2.39.2
Powered by blists - more mailing lists