1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
11  * Maxime Ripard <maxime.ripard@free-electrons.com>
21 #include <linux/reset-controller.h>
22 #include <linux/reset/reset-simple.h>
41 	spin_lock_irqsave(&data->lock, flags);  in reset_simple_update()
43 	reg = readl(data->membase + (bank * reg_width));  in reset_simple_update()
44 	if (assert ^ data->active_low)  in reset_simple_update()
48 	writel(reg, data->membase + (bank * reg_width));  in reset_simple_update()
50 	spin_unlock_irqrestore(&data->lock, flags);  in reset_simple_update()
73 	if (!data->reset_us)  in reset_simple_reset()
74 		return -ENOTSUPP;  in reset_simple_reset()
80 	usleep_range(data->reset_us, data->reset_us * 2);  in reset_simple_reset()
94 	reg = readl(data->membase + (bank * reg_width));  in reset_simple_status()
96 	return !(reg & BIT(offset)) ^ !data->status_active_low;  in reset_simple_status()
108  * struct reset_simple_devdata - simple reset controller properties
114  *                     asserted. Otherwise, bits read back as set while the
115  *                     reset is asserted.
138 	{ .compatible = "altr,stratix10-rst-mgr",
140 	{ .compatible = "st,stm32-rcc", },
141 	{ .compatible = "allwinner,sun6i-a31-clock-reset",
143 	{ .compatible = "zte,zx296718-reset",
145 	{ .compatible = "aspeed,ast2400-lpc-reset" },
146 	{ .compatible = "aspeed,ast2500-lpc-reset" },
147 	{ .compatible = "bitmain,bm1880-reset",
149 	{ .compatible = "snps,dw-high-reset" },
150 	{ .compatible = "snps,dw-low-reset",
157 	struct device *dev = &pdev->dev;  in reset_simple_probe()
168 		return -ENOMEM;  in reset_simple_probe()
175 	spin_lock_init(&data->lock);  in reset_simple_probe()
176 	data->membase = membase;  in reset_simple_probe()
177 	data->rcdev.owner = THIS_MODULE;  in reset_simple_probe()
178 	data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;  in reset_simple_probe()
179 	data->rcdev.ops = &reset_simple_ops;  in reset_simple_probe()
180 	data->rcdev.of_node = dev->of_node;  in reset_simple_probe()
183 		reg_offset = devdata->reg_offset;  in reset_simple_probe()
184 		if (devdata->nr_resets)  in reset_simple_probe()
185 			data->rcdev.nr_resets = devdata->nr_resets;  in reset_simple_probe()
186 		data->active_low = devdata->active_low;  in reset_simple_probe()
187 		data->status_active_low = devdata->status_active_low;  in reset_simple_probe()
190 	data->membase += reg_offset;  in reset_simple_probe()
192 	return devm_reset_controller_register(dev, &data->rcdev);  in reset_simple_probe()
198 		.name		= "simple-reset",