1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 2013-2015 Lantiq Beteiligungs-GmbH & Co.KG
7  *  Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de>
13 #include <linux/reset-controller.h>
43 	ret = regmap_read(priv->regmap, priv->status_offset, &val);  in lantiq_rcu_reset_status()
63 	} while (--retry);  in lantiq_rcu_reset_status_timeout()
65 	return -ETIMEDOUT;  in lantiq_rcu_reset_status_timeout()
76 	ret = regmap_update_bits(priv->regmap, priv->reset_offset, BIT(set),  in lantiq_rcu_reset_update()
79 		dev_err(priv->dev, "Failed to set reset bit %u\n", set);  in lantiq_rcu_reset_update()
86 		dev_err(priv->dev, "Failed to %s bit %u\n",  in lantiq_rcu_reset_update()
120 	.reset	= lantiq_rcu_reset_reset,
126 	struct device *dev = &pdev->dev;  in lantiq_rcu_reset_of_parse()
129 	priv->regmap = syscon_node_to_regmap(dev->of_node->parent);  in lantiq_rcu_reset_of_parse()
130 	if (IS_ERR(priv->regmap)) {  in lantiq_rcu_reset_of_parse()
131 		dev_err(&pdev->dev, "Failed to lookup RCU regmap\n");  in lantiq_rcu_reset_of_parse()
132 		return PTR_ERR(priv->regmap);  in lantiq_rcu_reset_of_parse()
135 	offset = of_get_address(dev->of_node, 0, NULL, NULL);  in lantiq_rcu_reset_of_parse()
137 		dev_err(&pdev->dev, "Failed to get RCU reset offset\n");  in lantiq_rcu_reset_of_parse()
138 		return -ENOENT;  in lantiq_rcu_reset_of_parse()
140 	priv->reset_offset = __be32_to_cpu(*offset);  in lantiq_rcu_reset_of_parse()
142 	offset = of_get_address(dev->of_node, 1, NULL, NULL);  in lantiq_rcu_reset_of_parse()
144 		dev_err(&pdev->dev, "Failed to get RCU status offset\n");  in lantiq_rcu_reset_of_parse()
145 		return -ENOENT;  in lantiq_rcu_reset_of_parse()
147 	priv->status_offset = __be32_to_cpu(*offset);  in lantiq_rcu_reset_of_parse()
157 	set = reset_spec->args[0];  in lantiq_rcu_reset_xlate()
158 	status = reset_spec->args[1];  in lantiq_rcu_reset_xlate()
160 	if (set >= rcdev->nr_resets || status >= rcdev->nr_resets)  in lantiq_rcu_reset_xlate()
161 		return -EINVAL;  in lantiq_rcu_reset_xlate()
171 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in lantiq_rcu_reset_probe()
173 		return -ENOMEM;  in lantiq_rcu_reset_probe()
175 	priv->dev = &pdev->dev;  in lantiq_rcu_reset_probe()
181 	priv->rcdev.ops = &lantiq_rcu_reset_ops;  in lantiq_rcu_reset_probe()
182 	priv->rcdev.owner = THIS_MODULE;  in lantiq_rcu_reset_probe()
183 	priv->rcdev.of_node = pdev->dev.of_node;  in lantiq_rcu_reset_probe()
184 	priv->rcdev.nr_resets = 32;  in lantiq_rcu_reset_probe()
185 	priv->rcdev.of_xlate = lantiq_rcu_reset_xlate;  in lantiq_rcu_reset_probe()
186 	priv->rcdev.of_reset_n_cells = 2;  in lantiq_rcu_reset_probe()
188 	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);  in lantiq_rcu_reset_probe()
192 	{ .compatible = "lantiq,danube-reset", },
193 	{ .compatible = "lantiq,xrx200-reset", },
201 		.name		= "lantiq-reset",
208 MODULE_DESCRIPTION("Lantiq XWAY RCU Reset Controller Driver");