/* * Copyright (C) 2017 Synopsys. * * Synopsys AXS10x reset driver. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/io.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/reset-controller.h> #define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev) #define AXS10X_MAX_RESETS 32 struct axs10x_rst { void __iomem *regs_rst; spinlock_t lock; struct reset_controller_dev rcdev; }; static int axs10x_reset_reset(struct reset_controller_dev *rcdev, unsigned long id) { struct axs10x_rst *rst = to_axs10x_rst(rcdev); unsigned long flags; spin_lock_irqsave(&rst->lock, flags); writel(BIT(id), rst->regs_rst); spin_unlock_irqrestore(&rst->lock, flags); return 0; } static const struct reset_control_ops axs10x_reset_ops = { .reset = axs10x_reset_reset, }; static int axs10x_reset_probe(struct platform_device *pdev) { struct axs10x_rst *rst; rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL); if (!rst) return -ENOMEM; rst->regs_rst = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(rst->regs_rst)) return PTR_ERR(rst->regs_rst); spin_lock_init(&rst->lock); rst->rcdev.owner = THIS_MODULE; rst->rcdev.ops = &axs10x_reset_ops; rst->rcdev.of_node = pdev->dev.of_node; rst->rcdev.nr_resets = AXS10X_MAX_RESETS; return devm_reset_controller_register(&pdev->dev, &rst->rcdev); } static const struct of_device_id axs10x_reset_dt_match[] = { { .compatible = "snps,axs10x-reset" }, { }, }; static struct platform_driver axs10x_reset_driver = { .probe = axs10x_reset_probe, .driver = { .name = "axs10x-reset", .of_match_table = axs10x_reset_dt_match, }, }; builtin_platform_driver(axs10x_reset_driver); MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>"); MODULE_DESCRIPTION("Synopsys AXS10x reset driver"); MODULE_LICENSE("GPL v2");