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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id f17-20020a17090ac29100b00232cc61e16bsm5029301pjt.35.2023.03.27.19.19.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Mar 2023 19:19:48 -0700 (PDT) From: Jacky Huang To: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, lee@kernel.org, mturquette@baylibre.com, sboyd@kernel.org, p.zabel@pengutronix.de, gregkh@linuxfoundation.org, jirislaby@kernel.org Cc: devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, arnd@arndb.de, schung@nuvoton.com, mjchen@nuvoton.com, Jacky Huang Subject: [PATCH v6 10/12] reset: Add Nuvoton ma35d1 reset driver support Date: Tue, 28 Mar 2023 02:19:10 +0000 Message-Id: <20230328021912.177301-11-ychuang570808@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230328021912.177301-1-ychuang570808@gmail.com> References: <20230328021912.177301-1-ychuang570808@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Jacky Huang This driver supports individual IP reset for ma35d1. The reset control registers is a subset of system control registers. Signed-off-by: Jacky Huang --- drivers/reset/Kconfig | 6 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-ma35d1.c | 152 +++++++++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+) create mode 100644 drivers/reset/reset-ma35d1.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 2a52c990d4fe..58477c6ca9b8 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -143,6 +143,12 @@ config RESET_NPCM This enables the reset controller driver for Nuvoton NPCM BMC SoCs. +config RESET_NUVOTON_MA35D1 + bool "Nuvton MA35D1 Reset Driver" + default ARCH_NUVOTON || COMPILE_TEST + help + This enables the reset controller driver for Nuvoton MA35D1 SoC. + config RESET_OXNAS bool diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 3e7e5fd633a8..fd52dcf66a99 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_RESET_MCHP_SPARX5) += reset-microchip-sparx5.o obj-$(CONFIG_RESET_MESON) += reset-meson.o obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o obj-$(CONFIG_RESET_NPCM) += reset-npcm.o +obj-$(CONFIG_RESET_NUVOTON_MA35D1) += reset-ma35d1.o obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o obj-$(CONFIG_RESET_POLARFIRE_SOC) += reset-mpfs.o diff --git a/drivers/reset/reset-ma35d1.c b/drivers/reset/reset-ma35d1.c new file mode 100644 index 000000000000..221299e7b873 --- /dev/null +++ b/drivers/reset/reset-ma35d1.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 Nuvoton Technology Corp. + * Author: Chi-Fang Li + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define REG_SYS_IPRST0 0x020 +#define REG_SYS_IPRST1 0x024 +#define REG_SYS_IPRST2 0x028 +#define REG_SYS_IPRST3 0x02C + +#define RST_PRE_REG 32 + +struct ma35d1_reset_data { + struct reset_controller_dev rcdev; + struct regmap *regmap; +}; + +struct ma35d1_reboot_data { + struct notifier_block restart_handler; + struct regmap *regmap; +}; + +static int ma35d1_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct ma35d1_reboot_data *data = + container_of(this, struct ma35d1_reboot_data, + restart_handler); + return regmap_write(data->regmap, REG_SYS_IPRST0, 1 << MA35D1_RESET_CHIP); +} + +static int ma35d1_reset_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + unsigned int reg; + int ret; + int offset = (id / RST_PRE_REG) * 4; + struct ma35d1_reset_data *data = + container_of(rcdev, struct ma35d1_reset_data, rcdev); + + ret = regmap_read(data->regmap, REG_SYS_IPRST0 + offset, ®); + if (ret < 0) + return ret; + if (assert) + reg |= 1 << (id % RST_PRE_REG); + else + reg &= ~(1 << (id % RST_PRE_REG)); + + return regmap_write(data->regmap, REG_SYS_IPRST0 + offset, reg); +} + +static int ma35d1_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return ma35d1_reset_update(rcdev, id, true); +} + +static int ma35d1_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return ma35d1_reset_update(rcdev, id, false); +} + +static int ma35d1_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int reg, ret; + int offset = id / RST_PRE_REG; + struct ma35d1_reset_data *data = + container_of(rcdev, struct ma35d1_reset_data, rcdev); + + ret = regmap_read(data->regmap, REG_SYS_IPRST0 + offset, ®); + if (ret < 0) + return ret; + return !!(reg & BIT(id % RST_PRE_REG)); +} + +static const struct reset_control_ops ma35d1_reset_ops = { + .assert = ma35d1_reset_assert, + .deassert = ma35d1_reset_deassert, + .status = ma35d1_reset_status, +}; + +static const struct of_device_id ma35d1_reset_dt_ids[] = { + { .compatible = "nuvoton,ma35d1-reset" }, + { }, +}; + +static int ma35d1_reset_probe(struct platform_device *pdev) +{ + int err; + struct device *dev = &pdev->dev; + struct device_node *parent; + struct ma35d1_reset_data *reset_data; + struct ma35d1_reboot_data *reboot_data; + + if (!pdev->dev.of_node) { + dev_err(&pdev->dev, "Device tree node not found\n"); + return -EINVAL; + } + + reset_data = devm_kzalloc(dev, sizeof(*reset_data), GFP_KERNEL); + if (!reset_data) + return -ENOMEM; + + reboot_data = devm_kzalloc(dev, sizeof(*reboot_data), GFP_KERNEL); + if (!reboot_data) + return -ENOMEM; + + parent = of_get_parent(dev->of_node); /* parent should be syscon node */ + reset_data->regmap = syscon_node_to_regmap(parent); + of_node_put(parent); + if (IS_ERR(reset_data->regmap)) { + dev_err(&pdev->dev, "Failed to get SYS register base\n"); + return PTR_ERR(reset_data->regmap); + } + + reset_data->rcdev.owner = THIS_MODULE; + reset_data->rcdev.nr_resets = MA35D1_RESET_COUNT; + reset_data->rcdev.ops = &ma35d1_reset_ops; + reset_data->rcdev.of_node = dev->of_node; + + reboot_data->regmap = reset_data->regmap; + reboot_data->restart_handler.notifier_call = ma35d1_restart_handler; + reboot_data->restart_handler.priority = 192; + + err = register_restart_handler(&reboot_data->restart_handler); + if (err) + dev_warn(&pdev->dev, "failed to register restart handler\n"); + + return devm_reset_controller_register(dev, &reset_data->rcdev); +} + +static struct platform_driver ma35d1_reset_driver = { + .probe = ma35d1_reset_probe, + .driver = { + .name = "ma35d1-reset", + .of_match_table = ma35d1_reset_dt_ids, + }, +}; + +builtin_platform_driver(ma35d1_reset_driver);