Add reset driver for Sunplus SP7021 SoC. Signed-off-by: Qin Jian <qinjian@xxxxxxxxxxx> --- MAINTAINERS | 1 + drivers/reset/Kconfig | 8 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-sunplus.c | 159 ++++++++++++++++++++++++++++++++++ 4 files changed, 169 insertions(+) create mode 100644 drivers/reset/reset-sunplus.c diff --git a/MAINTAINERS b/MAINTAINERS index 652f42cab..6caffd6d0 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2662,6 +2662,7 @@ S: Maintained W: https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview F: Documentation/devicetree/bindings/arm/sunplus,sp7021.yaml F: Documentation/devicetree/bindings/reset/sunplus,reset.yaml +F: drivers/reset/reset-sunplus.c F: include/dt-bindings/reset/sp-sp7021.h ARM/Synaptics SoC support diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index be799a5ab..50695ab47 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -249,6 +249,14 @@ config RESET_TI_SYSCON you wish to use the reset framework for such memory-mapped devices, say Y here. Otherwise, say N. +config RESET_SUNPLUS + bool "Sunplus SoCs Reset Driver" + help + This enables the reset driver support for Sunplus SP7021 SoC family. + Say Y if you want to control reset signals by the reset controller. + Otherwise, say N. + This driver is selected automatically by platform config. + config RESET_UNIPHIER tristate "Reset controller driver for UniPhier SoCs" depends on ARCH_UNIPHIER || COMPILE_TEST diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 21d46d886..f03403e97 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_RESET_RZG2L_USBPHY_CTRL) += reset-rzg2l-usbphy-ctrl.o obj-$(CONFIG_RESET_SCMI) += reset-scmi.o obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o +obj-$(CONFIG_RESET_SUNPLUS) += reset-sunplus.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o diff --git a/drivers/reset/reset-sunplus.c b/drivers/reset/reset-sunplus.c new file mode 100644 index 000000000..696efd75e --- /dev/null +++ b/drivers/reset/reset-sunplus.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +/* + * SP7021 reset driver + * + * Copyright (C) Sunplus Technology Co., Ltd. + * All rights reserved. + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/reboot.h> + +#if defined(CONFIG_SOC_SP7021) +#include <dt-bindings/reset/sp-sp7021.h> +#elif defined(CONFIG_SOC_Q645) +#include <dt-bindings/reset/sp-q645.h> +#endif + +#define BITASSERT(id, val) ((1 << (16 + id)) | (val << id)) + + +struct sp_reset_data { + struct reset_controller_dev rcdev; + void __iomem *membase; +} sp_reset; + + +static inline struct sp_reset_data * +to_sp_reset_data(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct sp_reset_data, rcdev); +} + +static int sp_reset_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct sp_reset_data *data = to_sp_reset_data(rcdev); + int reg_width = sizeof(u32)/2; + int bank = id / (reg_width * BITS_PER_BYTE); + int offset = id % (reg_width * BITS_PER_BYTE); + void __iomem *addr; + + addr = data->membase + (bank * 4); + + if (assert) + writel(BITASSERT(offset, 1), addr); + else + writel(BITASSERT(offset, 0), addr); + + return 0; +} + +static int sp_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return sp_reset_update(rcdev, id, true); +} + + +static int sp_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return sp_reset_update(rcdev, id, false); +} + +static int sp_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct sp_reset_data *data = to_sp_reset_data(rcdev); + int reg_width = sizeof(u32)/2; + int bank = id / (reg_width * BITS_PER_BYTE); + int offset = id % (reg_width * BITS_PER_BYTE); + u32 reg; + + reg = readl(data->membase + (bank * 4)); + + return !!(reg & BIT(offset)); +} + +static int sp_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + sp_reset_assert(&sp_reset.rcdev, RST_SYSTEM); + sp_reset_deassert(&sp_reset.rcdev, RST_SYSTEM); + + return NOTIFY_DONE; +} + +static struct notifier_block sp_restart_nb = { + .notifier_call = sp_restart, + .priority = 192, +}; + +static const struct reset_control_ops sp_reset_ops = { + .assert = sp_reset_assert, + .deassert = sp_reset_deassert, + .status = sp_reset_status, +}; + +static const struct of_device_id sp_reset_dt_ids[] = { + { .compatible = "sunplus,sp7021-reset", }, + { .compatible = "sunplus,q645-reset", }, + { /* sentinel */ }, +}; + +static int sp_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sp_reset_data *data = &sp_reset; + void __iomem *membase; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + membase = devm_ioremap(dev, res->start, resource_size(res)); + if (IS_ERR(membase)) + return PTR_ERR(membase); + + data->membase = membase; + data->rcdev.owner = THIS_MODULE; + data->rcdev.nr_resets = RST_MAX; + data->rcdev.ops = &sp_reset_ops; + data->rcdev.of_node = dev->of_node; + register_restart_handler(&sp_restart_nb); + + return devm_reset_controller_register(dev, &data->rcdev); +} + +static struct platform_driver sp_reset_driver = { + .probe = sp_reset_probe, + .driver = { + .name = "sunplus-reset", + .of_match_table = sp_reset_dt_ids, + }, +}; + +static int __init sp_reset_init(void) +{ + return platform_driver_register(&sp_reset_driver); +} +arch_initcall(sp_reset_init); + +MODULE_AUTHOR("Edwin Chiu <edwin.chiu@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Sunplus Reset Driver"); +MODULE_LICENSE("GPL"); -- 2.33.1
