From patchwork Sun Dec 13 08:10:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 343732 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-21.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D8B8C4361B for ; Sun, 13 Dec 2020 08:13:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24B2D22D74 for ; Sun, 13 Dec 2020 08:13:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404167AbgLMINd (ORCPT ); Sun, 13 Dec 2020 03:13:33 -0500 Received: from esa1.hgst.iphmx.com ([68.232.141.245]:32155 "EHLO esa1.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404130AbgLMINd (ORCPT ); Sun, 13 Dec 2020 03:13:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1607847211; x=1639383211; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fIaxjbAWWNgcvXbbu108kFj+8gDfBhmvtKF+sYbgjzk=; b=cypToVlrX8xkpbgoIF/z2DVY4wsXtUABbWNnTJKz4fL9iD5bgXccUY/l TAce9FaB+MNxKUQrAhww0HwqSj+1K1ZtCgZ76vqNK/LI0AdjudOQpPlDX CLCKrgCpmnw7ig3cN6kUR50po1THHL0Nxe0+LNDSK3VzPbaPoZk8ddkWs OuTKdoFEO9KDQQIC2XG0yEEmiLSyEDSMh5xl5iX29+fBxQ2j6WTjjXN2H lP2oPubop/4Vbg8K/yoF1wJqKV+yo+0t8MgkF4JjaVbKffs8ZWUDa2NC9 9E5Z4TpHawpZLJv1+fxcX5r+CbvrrGpXu4n6sM/PW8HSTeAnNMOl6nmm2 Q==; IronPort-SDR: h/HYHiknUUD4eORwm/2bnAjKlWbCxFnmzIHq8zmLOm+m/BABd3lgqAWlJezGJouzah//nU5NaZ UiGLTZuaAWkznFBBXok7ayn7Y6FvXZA3fLhwXa56JRuAIqkpK9uPgj8VEOkfp/Edin/DmJbGJd E46CPmzb0jyIbPqauttI3Jukb0W+m4fsXOo+C3KEqoq3AwxstnIHQ0JgWhV++M07jBBcf/P4yS aWzMyclSqTauHJAJg3J8Vfmvqj8ZonRgqbWAe0xCiMp6hzTheKBY1MCEtn8Pdka0qMfmX6NCo1 YJs= X-IronPort-AV: E=Sophos;i="5.78,415,1599494400"; d="scan'208";a="265208201" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 13 Dec 2020 16:10:47 +0800 IronPort-SDR: Zq+jr3qf+kEIhuOUwRMhUtGwGdLy+7CfL7gNzy+dbaKbWlkeWBH2mRHiYsAT0Fpg1IeG99RB8G 2ai7qxbh+QA45Wa8ZHB7RYoww3rcGjhRptTTrM6NiKK1VWtCMSIXqsi8bMOzzamERCjFZA1ZQH /hz9OgMEX69eclHomdb+2i1SQMeoEBOPBg876/xFCrHA6e+Y5LxRELesPpY20h5hNsqH+C2TAn VqWpr4kR75ywKV4WBaBeKEfqM8t5LWGewE8bekZ0NXbb0tUF9TQ82P6SKaHoIm1PSZ4uU0z75v tvuZcn4oQDj4+JkiqnZxPVZO Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Dec 2020 23:56:08 -0800 IronPort-SDR: e3e9QkyjnZJbviseQu/QNipAw15wWTxRLrXTnZL6iCuph6jt9GCSJzddm1NMnnlKlD2A6yJ0kf G6oN4q3i3JAFo0Y1zJdtoOARCsGuIBVuz8ZAM7+H3nMhR69DPGLqqS0CEg0falwyHhY0tGxxJG jvm1Fz+czdVWUV3y2CSC+zLrRm1sXCSNi1jJ9Js8Brq2R4Yd2SV4rToUuFqOUXCVxioY+UUe/c jgRF+k4b2md8IYu1KYcDwUZxx5wGsPm9jxyU5p9/yLknSvADfiXVIf2ZcRU/9+onOVFJPGKglb NMg= WDCIronportException: Internal Received: from phd004806.ad.shared (HELO twashi.fujisawa.hgst.com) ([10.84.71.197]) by uls-op-cesaip02.wdc.com with ESMTP; 13 Dec 2020 00:10:46 -0800 From: Damien Le Moal To: Palmer Dabbelt , linux-riscv@lists.infradead.org, Rob Herring , devicetree@vger.kernel.org, Stephen Boyd , linux-clk@vger.kernel.org, Linus Walleij , linux-gpio@vger.kernel.org, Philipp Zabel Cc: Sean Anderson Subject: [PATCH v9 13/22] riscv: Add Canaan Kendryte K210 reset controller Date: Sun, 13 Dec 2020 17:10:07 +0900 Message-Id: <20201213081016.179192-14-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201213081016.179192-1-damien.lemoal@wdc.com> References: <20201213081016.179192-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add a reset controller driver for the Canaan Kendryte K210 SoC. This driver relies on its syscon compatible parent node (sysctl) for its register mapping. Default this driver compilation to y when the SOC_CANAAN option is selected. The MAINTAINERS file is updated, adding the entry "CANAAN/KENDRYTE K210 SOC RESET CONTROLLER DRIVER" with myself listed as maintainer for this driver. Signed-off-by: Damien Le Moal Reviewed-by: Philipp Zabel --- MAINTAINERS | 8 +++ arch/riscv/Kconfig.socs | 1 + drivers/reset/Kconfig | 10 +++ drivers/reset/Makefile | 1 + drivers/reset/reset-k210.c | 131 +++++++++++++++++++++++++++++++++++++ 5 files changed, 151 insertions(+) create mode 100644 drivers/reset/reset-k210.c diff --git a/MAINTAINERS b/MAINTAINERS index 85a6a0beebd1..6059a1e4caa6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3831,6 +3831,14 @@ W: https://github.com/Cascoda/ca8210-linux.git F: Documentation/devicetree/bindings/net/ieee802154/ca8210.txt F: drivers/net/ieee802154/ca8210.c +CANAAN/KENDRYTE K210 SOC RESET CONTROLLER DRIVER +M: Damien Le Moal +L: linux-kernel@vger.kernel.org +L: linux-riscv@lists.infradead.org +S: Maintained +F: Documentation/devicetree/bindings/reset/canaan,k210-rst.yaml +F: drivers/reset/reset-k210.c + CANAAN/KENDRYTE K210 SOC SYSTEM CONTROLLER DRIVER M: Damien Le Moal L: linux-riscv@lists.infradead.org diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs index 88ac0d1a5da4..fdefd7eff1ae 100644 --- a/arch/riscv/Kconfig.socs +++ b/arch/riscv/Kconfig.socs @@ -29,6 +29,7 @@ config SOC_CANAAN select SERIAL_SIFIVE if TTY select SERIAL_SIFIVE_CONSOLE if TTY select SIFIVE_PLIC + select ARCH_HAS_RESET_CONTROLLER help This enables support for Canaan Kendryte K210 SoC platform hardware. diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 07d162b179fc..8bd4f1c34631 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -82,6 +82,16 @@ config RESET_INTEL_GW Say Y to control the reset signals provided by reset controller. Otherwise, say N. +config RESET_K210 + bool "Reset controller driver for Canaan Kendryte K210 SoC" + depends on (SOC_CANAAN || COMPILE_TEST) && OF + select MFD_SYSCON + default SOC_CANAAN + help + Support for the Canaan Kendryte K210 RISC-V SoC reset controller. + Say Y if you want to control reset signals provided by this + controller. + config RESET_LANTIQ bool "Lantiq XWAY Reset Driver" if COMPILE_TEST default SOC_TYPE_XWAY diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 16947610cc3b..ef2e807721fa 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o +obj-$(CONFIG_RESET_K210) += reset-k210.o obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o obj-$(CONFIG_RESET_MESON) += reset-meson.o diff --git a/drivers/reset/reset-k210.c b/drivers/reset/reset-k210.c new file mode 100644 index 000000000000..1b6e03522b40 --- /dev/null +++ b/drivers/reset/reset-k210.c @@ -0,0 +1,131 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2020 Western Digital Corporation or its affiliates. + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define K210_RST_MASK 0x27FFFFFF + +struct k210_rst { + struct regmap *map; + struct reset_controller_dev rcdev; +}; + +static inline struct k210_rst * +to_k210_rst(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct k210_rst, rcdev); +} + +static inline int k210_rst_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct k210_rst *ksr = to_k210_rst(rcdev); + + return regmap_update_bits(ksr->map, K210_SYSCTL_PERI_RESET, BIT(id), 1); +} + +static inline int k210_rst_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct k210_rst *ksr = to_k210_rst(rcdev); + + return regmap_update_bits(ksr->map, K210_SYSCTL_PERI_RESET, BIT(id), 0); +} + +static int k210_rst_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = k210_rst_assert(rcdev, id); + if (ret == 0) { + udelay(10); + ret = k210_rst_deassert(rcdev, id); + } + + return ret; +} + +static int k210_rst_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct k210_rst *ksr = to_k210_rst(rcdev); + u32 reg, bit = BIT(id); + int ret; + + ret = regmap_read(ksr->map, K210_SYSCTL_PERI_RESET, ®); + if (ret) + return ret; + + return reg & bit; +} + +static int k210_rst_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + unsigned long id = reset_spec->args[0]; + + if (!(BIT(id) & K210_RST_MASK)) + return -EINVAL; + + return id; +} + +static const struct reset_control_ops k210_rst_ops = { + .assert = k210_rst_assert, + .deassert = k210_rst_deassert, + .reset = k210_rst_reset, + .status = k210_rst_status, +}; + +static int k210_rst_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *parent_np = of_get_parent(dev->of_node); + struct k210_rst *ksr; + + dev_info(dev, "K210 reset controller\n"); + + ksr = devm_kzalloc(dev, sizeof(*ksr), GFP_KERNEL); + if (!ksr) + return -ENOMEM; + + ksr->map = syscon_node_to_regmap(parent_np); + of_node_put(parent_np); + if (IS_ERR(ksr->map)) + return PTR_ERR(ksr->map); + + ksr->rcdev.owner = THIS_MODULE; + ksr->rcdev.dev = dev; + ksr->rcdev.of_node = dev->of_node; + ksr->rcdev.ops = &k210_rst_ops; + ksr->rcdev.nr_resets = fls(K210_RST_MASK); + ksr->rcdev.of_reset_n_cells = 1; + ksr->rcdev.of_xlate = k210_rst_xlate; + + return devm_reset_controller_register(dev, &ksr->rcdev); +} + +static const struct of_device_id k210_rst_dt_ids[] = { + { .compatible = "canaan,k210-rst" }, + { /* sentinel */ }, +}; + +static struct platform_driver k210_rst_driver = { + .probe = k210_rst_probe, + .driver = { + .name = "k210-rst", + .of_match_table = k210_rst_dt_ids, + }, +}; +builtin_platform_driver(k210_rst_driver);