From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from azure-sdnproxy.icoremail.net (l-sdnproxy.icoremail.net [20.188.111.126]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 1177479F2; Wed, 4 Jun 2025 08:53:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=20.188.111.126 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749027209; cv=none; b=E9RDz+TnVn0ExOZvFrkG5ECRNg3VxkaDV4i59XMveoVyTDSbchIIbQJ8VH3hiEiEQBEM6HiYxd/EUU9bqBBkdADLkt/S7omzjbnQ8/KHZ4QgCLjInCx5G+lSXFenDo4JMI0RVzygfBhFnWbLi/Mztbh+3BUcHSmt/ufQOB845Hc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749027209; c=relaxed/simple; bh=0raP6kQ+xdKD/BKhewzzU6dHTKE5TG1RBJh6rBA9LCw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QZ79XT9D7od1ZORL96NuQaFn1KkAumw93WVcrgYFx4uk1/IuNZXzxNHy2UtbofphZMh+/YpXdPPl3Ca0kJ1RQpAz251Th24r65KAjfUiv3FJ7TtRXtanA903TpBBMD0DF+XQpsAkNRUaUWw5n02m3JrSYQgF2nIAf+/KfudeQ4c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=eswincomputing.com; spf=pass smtp.mailfrom=eswincomputing.com; arc=none smtp.client-ip=20.188.111.126 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=eswincomputing.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=eswincomputing.com Received: from E0005152DT.eswin.cn (unknown [10.12.96.41]) by app2 (Coremail) with SMTP id TQJkCgAnuZJ+CUBo7WKaAA--.10072S2; Wed, 04 Jun 2025 16:53:20 +0800 (CST) From: dongxuyang@eswincomputing.com To: p.zabel@pengutronix.de, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ningyu@eswincomputing.com, linmin@eswincomputing.com, huangyifeng@eswincomputing.com, Xuyang Dong Subject: [PATCH v2 2/2] reset: eswin: Add eic7700 reset driver Date: Wed, 4 Jun 2025 16:53:16 +0800 Message-Id: <20250604085316.2211-1-dongxuyang@eswincomputing.com> X-Mailer: git-send-email 2.31.1.windows.1 In-Reply-To: <20250604085124.2098-1-dongxuyang@eswincomputing.com> References: <20250604085124.2098-1-dongxuyang@eswincomputing.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:TQJkCgAnuZJ+CUBo7WKaAA--.10072S2 X-Coremail-Antispam: 1UD129KBjvJXoW3XFW7Kry5GrW7Gry3CFy8Xwb_yoWfArW5pF WrGFW3Jr4UJr4fWw4xJryv9F4ag3Z3KFyUGrZrKw4Iyw13ta4UJF48tFyrtFyDCryDXFy5 KF12gayruFnxtF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBv14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jrv_JF1lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lw4CEc2x0rVAKj4xxMxkF7I0En4kS14v26r1q6r43MxkIecxEwVCm-wCF04 k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18 MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr4 1lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1l IxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4 A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUHCJQUUUUU= X-CM-SenderInfo: pgrqw5xx1d0w46hv4xpqfrz1xxwl0woofrz/ From: Xuyang Dong Add support for reset controller in eic7700 series chips. Provide functionality for asserting and deasserting resets on the chip. Signed-off-by: Yifeng Huang Signed-off-by: Xuyang Dong --- drivers/reset/Kconfig | 10 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-eic7700.c | 234 ++++++++++++++++++++++++++++++++++ 3 files changed, 245 insertions(+) create mode 100644 drivers/reset/reset-eic7700.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index d85be5899da6..82f829f4c9f0 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -66,6 +66,16 @@ config RESET_BRCMSTB_RESCAL This enables the RESCAL reset controller for SATA, PCIe0, or PCIe1 on BCM7216. +config RESET_EIC7700 + bool "Reset controller driver for ESWIN SoCs" + depends on ARCH_ESWIN || COMPILE_TEST + default ARCH_ESWIN + help + This enables the reset controller driver for ESWIN SoCs. This driver is + specific to ESWIN SoCs and should only be enabled if using such hardware. + The driver supports eic7700 series chips and provides functionality for + asserting and deasserting resets on the chip. + config RESET_EYEQ bool "Mobileye EyeQ reset controller" depends on MACH_EYEQ5 || MACH_EYEQ6H || COMPILE_TEST diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 91e6348e3351..ceafbad0555c 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o +obj-$(CONFIG_RESET_EIC7700) += reset-eic7700.o obj-$(CONFIG_RESET_EYEQ) += reset-eyeq.o obj-$(CONFIG_RESET_GPIO) += reset-gpio.o obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o diff --git a/drivers/reset/reset-eic7700.c b/drivers/reset/reset-eic7700.c new file mode 100644 index 000000000000..e651016ea042 --- /dev/null +++ b/drivers/reset/reset-eic7700.c @@ -0,0 +1,234 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2024, Beijing ESWIN Computing Technology Co., Ltd.. All rights reserved. + * + * ESWIN Reset Driver + * + * Authors: + * Yifeng Huang + * Xuyang Dong + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SYSCRG_CLEAR_BOOT_INFO_OFFSET 0x30C +#define CLEAR_BOOT_FLAG_BIT BIT(0) +#define SYSCRG_RESET_OFFSET 0x400 + +/** + * struct eswin_reset_data - reset controller information structure + * @rcdev: reset controller entity + * @dev: reset controller device pointer + * @idr: idr structure for mapping ids to reset control structures + * @regmap: reset controller device register map + */ +struct eswin_reset_data { + struct reset_controller_dev rcdev; + struct device *dev; + struct idr idr; + struct regmap *regmap; +}; + +/** + * struct eswin_reset_control - reset control structure + * @dev_id: SoC-specific device identifier + * @reset_bit: reset mask to use for toggling reset + */ +struct eswin_reset_control { + u32 dev_id; + u32 reset_bit; +}; + +#define to_eswin_reset_data(p) container_of((p), struct eswin_reset_data, rcdev) + +/** + * eswin_reset_set() - program a device's reset + * @rcdev: reset controller entity + * @id: ID of the reset to toggle + * @assert: boolean flag to indicate assert or deassert + * + * This is a common internal function used to assert or deassert a device's + * reset by clear and set the reset bit. The device's reset is asserted if the + * @assert argument is true, or deasserted if @assert argument is false. + * + * Return: 0 for successful request, else a corresponding error value + */ +static int eswin_reset_set(struct reset_controller_dev *rcdev, unsigned long id, + bool assert) +{ + struct eswin_reset_data *data = to_eswin_reset_data(rcdev); + struct eswin_reset_control *control; + int ret; + + control = idr_find(&data->idr, id); + + if (!control) + return -EINVAL; + + if (assert) + ret = regmap_clear_bits(data->regmap, SYSCRG_RESET_OFFSET + + control->dev_id * sizeof(u32), + control->reset_bit); + else + ret = regmap_set_bits(data->regmap, SYSCRG_RESET_OFFSET + + control->dev_id * sizeof(u32), + control->reset_bit); + + return ret; +} + +static int eswin_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return eswin_reset_set(rcdev, id, true); +} + +static int eswin_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return eswin_reset_set(rcdev, id, false); +} + +static int eswin_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = eswin_reset_assert(rcdev, id); + if (ret != 0) + return ret; + + usleep_range(10, 15); + ret = eswin_reset_deassert(rcdev, id); + if (ret != 0) + return ret; + + return 0; +} + +static const struct reset_control_ops eswin_reset_ops = { + .reset = eswin_reset_reset, + .assert = eswin_reset_assert, + .deassert = eswin_reset_deassert, +}; + +static int eswin_reset_of_xlate_lookup_id(int id, void *p, void *data) +{ + struct of_phandle_args *reset_spec = (struct of_phandle_args *)data; + struct eswin_reset_control *slot_control = + (struct eswin_reset_control *)p; + + if (reset_spec->args[0] == slot_control->dev_id && + reset_spec->args[1] == slot_control->reset_bit) + return id; + + return 0; +} + +/** + * eswin_reset_of_xlate() - translate a set of OF arguments to a reset ID + * @rcdev: reset controller entity + * @reset_spec: OF reset argument specifier + * + * This function performs the translation of the reset argument specifier + * values defined in a reset consumer device node. The function allocates a + * reset control structure for that device reset, and will be used by the + * driver for performing any reset functions on that reset. An idr structure + * is allocated and used to map to the reset control structure. This idr + * is used by the driver to do reset lookups. + * + * Return: 0 for successful request, else a corresponding error value + */ +static int eswin_reset_of_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + struct eswin_reset_data *data = to_eswin_reset_data(rcdev); + struct eswin_reset_control *control; + int ret; + + if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells)) + return -EINVAL; + + ret = idr_for_each(&data->idr, eswin_reset_of_xlate_lookup_id, + (void *)reset_spec); + if (ret) + return ret; + + control = devm_kzalloc(data->dev, sizeof(*control), GFP_KERNEL); + if (!control) + return -ENOMEM; + + control->dev_id = reset_spec->args[0]; + control->reset_bit = reset_spec->args[1]; + + return idr_alloc(&data->idr, control, 0, 0, GFP_KERNEL); +} + +static const struct of_device_id eswin_reset_dt_ids[] = { + { + .compatible = "eswin,eic7700-reset", + }, + { /* sentinel */ } +}; + +static int eswin_reset_probe(struct platform_device *pdev) +{ + struct eswin_reset_data *data; + struct device *dev = &pdev->dev; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), "failed to get regmap!\n"); + + platform_set_drvdata(pdev, data); + + data->rcdev.owner = THIS_MODULE; + data->rcdev.ops = &eswin_reset_ops; + data->rcdev.of_node = pdev->dev.of_node; + data->rcdev.of_reset_n_cells = 2; + data->rcdev.of_xlate = eswin_reset_of_xlate; + data->rcdev.dev = &pdev->dev; + data->dev = &pdev->dev; + idr_init(&data->idr); + + /* clear boot flag so u84 and scpu could be reseted by software */ + regmap_set_bits(data->regmap, SYSCRG_CLEAR_BOOT_INFO_OFFSET, + CLEAR_BOOT_FLAG_BIT); + msleep(50); + + return devm_reset_controller_register(&pdev->dev, &data->rcdev); +} + +static void eswin_reset_remove(struct platform_device *pdev) +{ + struct eswin_reset_data *data = platform_get_drvdata(pdev); + + idr_destroy(&data->idr); +} + +static struct platform_driver eswin_reset_driver = { + .probe = eswin_reset_probe, + .remove = eswin_reset_remove, + .driver = { + .name = "eswin-reset", + .of_match_table = eswin_reset_dt_ids, + }, +}; + +static int __init eswin_reset_init(void) +{ + return platform_driver_register(&eswin_reset_driver); +} +arch_initcall(eswin_reset_init); -- 2.17.1