From patchwork Thu Jul 20 11:29:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Shubin via B4 Relay X-Patchwork-Id: 13320036 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 77D361774A for ; Thu, 20 Jul 2023 08:30:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 68AA2C611BB; Thu, 20 Jul 2023 08:29:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689841797; bh=ct/EpuMvdUCuMjjViIZ5tkc4m9rWwQV30W6wJGWQmXQ=; h=From:Date:Subject:References:In-Reply-To:List-Id:To:Cc:Reply-To: From; b=f7VetNXkHGEwNxsJGXYEsLDGzhyKv0QX6gOJXr+7h/Yqy7G7z87TpnlfcArekXxHL 3a9rGKxCB5FLOtbN6/oOgs116+rebxMeLRMvMU0leLI8gseRJ5tjxDonh4owOR3aI9 KEOG78YjnY0n/yKXVuWbivQ9Ihi2+T/fBaKJ/GMePD9QHza8pFOuGfaLQSQP+95Q1H Ji6G3rvf84lvtaTTGNlPSe5xFz8VqBxQ8LyMveMTf5q134+AIDKqzGFKUh02spxKJz TwXRTrPzXdufRD8iHjZdk5RZ90vhr5EjrZ6LwqyoYgcp2NUJamRXE2kFIS9y8r9MK/ RZmUtCXEJDZ8g== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 547D9C05051; Thu, 20 Jul 2023 08:29:57 +0000 (UTC) From: Nikita Shubin via B4 Relay Date: Thu, 20 Jul 2023 14:29:14 +0300 Subject: [PATCH v3 14/42] power: reset: Add a driver for the ep93xx reset Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20230605-ep93xx-v3-14-3d63a5f1103e@maquefel.me> References: <20230605-ep93xx-v3-0-3d63a5f1103e@maquefel.me> In-Reply-To: <20230605-ep93xx-v3-0-3d63a5f1103e@maquefel.me> List-Id: To: Hartley Sweeten , Lennert Buytenhek , Alexander Sverdlin , Russell King , Lukasz Majewski , Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Turquette , Stephen Boyd , Nikita Shubin , Daniel Lezcano , Thomas Gleixner , Alessandro Zummo , Alexandre Belloni , Wim Van Sebroeck , Guenter Roeck , Sebastian Reichel , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Mark Brown , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vinod Koul , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Damien Le Moal , Sergey Shtylyov , Dmitry Torokhov , Arnd Bergmann , Olof Johansson , soc@kernel.org, Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Andy Shevchenko , Michael Peters , Kris Bahnsen Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-pm@vger.kernel.org, linux-pwm@vger.kernel.org, linux-spi@vger.kernel.org, netdev@vger.kernel.org, dmaengine@vger.kernel.org, linux-mtd@lists.infradead.org, linux-ide@vger.kernel.org, linux-input@vger.kernel.org, alsa-devel@alsa-project.org X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1689852590; l=4404; i=nikita.shubin@maquefel.me; s=20230718; h=from:subject:message-id; bh=jarF+KELK7mZorvLAgBXky3sB5pXOZlhQ5qnPmmBEEc=; =?utf-8?q?b=3DsU2/xrwREaEF?= =?utf-8?q?hfdVfzNIHKHyeuUxFdGxGcpzUMuQQY86vWK69t09xviiikO7SiDRkSFcdJG9PuZV?= hHMf4YqYDw3cUCWElglNk3PsyWdNstIDwmSDzYvqa1AWe2iFMrtc X-Developer-Key: i=nikita.shubin@maquefel.me; a=ed25519; pk=vqf5YIUJ7BJv3EJFaNNxWZgGuMgDH6rwufTLflwU9ac= X-Endpoint-Received: by B4 Relay for nikita.shubin@maquefel.me/20230718 with auth_id=65 X-Original-From: Nikita Shubin Reply-To: From: Nikita Shubin 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 Acked-by: Sebastian Reichel --- 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 + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +#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);