From patchwork Wed Nov 22 08:59:43 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: 13464272 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 F0CE838F97 for ; Wed, 22 Nov 2023 09:01:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="e0tHitLS" Received: by smtp.kernel.org (Postfix) with ESMTPS id 959CCC433CD; Wed, 22 Nov 2023 09:01:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700643674; bh=kROALI7H7XlG/WWOBl5FDyzSKHXAe+i+E4cXdab3Czk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=e0tHitLS4h5IHETWAfwspRr3KI7FOmv+dwAwdB0BrSmcVoYGYJYCo97kutZngwXJp 59CHz83ILVC85uwgxaDiBmkCsiElCv6lXpM+RG9JoplJ7Y/DxMvyMa98exXkMMn7LJ Sf1fWCPAYQzj7nlK2QzEQznotJ5rf6rl58gs/0pSzgiT3o/+LS+j4DUvMpSEiy6IJG JgrkEC7obCLgv8kykRXWrjxEjWN8eyz0CtrnGtWvggwpqLCwXKlXntokFvdB5H9Trw 0KtYET0EPJrnMikS+lmmEiAFGZaU8wTZo8vi/DIh1zT130y516cPTaakSMUTX+TKx7 OFDMUONQBo+lA== 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 82F40C072A2; Wed, 22 Nov 2023 09:01:14 +0000 (UTC) From: Nikita Shubin via B4 Relay Date: Wed, 22 Nov 2023 11:59:43 +0300 Subject: [PATCH v5 05/39] power: reset: Add a driver for the ep93xx reset Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231122-ep93xx-v5-5-d59a76d5df29@maquefel.me> References: <20231122-ep93xx-v5-0-d59a76d5df29@maquefel.me> In-Reply-To: <20231122-ep93xx-v5-0-d59a76d5df29@maquefel.me> To: Sebastian Reichel Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Alexander Sverdlin X-Mailer: b4 0.13-dev-e3e53 X-Developer-Signature: v=1; a=ed25519-sha256; t=1700643671; l=4341; i=nikita.shubin@maquefel.me; s=20230718; h=from:subject:message-id; bh=2dRIKOLWszPxi+9b0FTS7OAA+oaoyJlFBwr1qUznIKk=; =?utf-8?q?b=3D9RJkRy13Dv8E?= =?utf-8?q?S+jAii5tOGyQheT+HkcqYmmkQB8FrdGlAmN94PD1tifflc69nnoevJImZ+Pbp3Ev?= Ubzf72orAeEIpbg6sptDITMSI1Z1XeMrQuGpZndlqZe3fjJjG/dJ 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 | 81 ++++++++++++++++++++++++++++++++++++ 3 files changed, 92 insertions(+) diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index fece990af4a7..389d5a193e5d 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 a95d1bd275d1..10782d32e1da 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..838dbedc1dc4 --- /dev/null +++ b/drivers/power/reset/ep93xx-restart.c @@ -0,0 +1,81 @@ +// 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 0x80 +#define EP93XX_SYSCON_DEVCFG_SWRST BIT(31) + +struct ep93xx_restart { + struct ep93xx_regmap_adev *aux_dev; + 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); + struct ep93xx_regmap_adev *aux = priv->aux_dev; + + /* Issue the reboot */ + aux->update_bits(aux->map, aux->lock, EP93XX_SYSCON_DEVCFG, + EP93XX_SYSCON_DEVCFG_SWRST, EP93XX_SYSCON_DEVCFG_SWRST); + aux->update_bits(aux->map, aux->lock, EP93XX_SYSCON_DEVCFG, + EP93XX_SYSCON_DEVCFG_SWRST, 0); + + return NOTIFY_DONE; +} + +static int ep93xx_reboot_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct ep93xx_regmap_adev *rdev = to_ep93xx_regmap_adev(adev); + struct device *dev = &adev->dev; + struct ep93xx_restart *priv; + int err; + + if (!rdev->update_bits) + return -ENODEV; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->aux_dev = rdev; + + 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 auxiliary_device_id ep93xx_reboot_ids[] = { + { + .name = "soc_ep93xx.reset-ep93xx", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(auxiliary, ep93xx_reboot_ids); + +static struct auxiliary_driver ep93xx_reboot_driver = { + .probe = ep93xx_reboot_probe, + .id_table = ep93xx_reboot_ids, +}; +module_auxiliary_driver(ep93xx_reboot_driver);