1 // SPDX-License-Identifier: GPL-2.0
13 #include <linux/reset-controller.h>
39 	.name =		"intel-reset",
47  * Reset status register offset relative to
48  * the reset control register(X) is X + 4
57 	if (data->soc_data->legacy)  in id_to_reg_and_bit_offsets()
62 	if (data->soc_data->legacy && *rst_req == RCU_RST_REQ)  in id_to_reg_and_bit_offsets()
78 	ret = regmap_update_bits(data->regmap, rst_req,  BIT(req_bit), val);  in intel_set_clr_bits()
82 	return regmap_read_poll_timeout(data->regmap, rst_stat, val,  in intel_set_clr_bits()
95 		dev_err(data->dev, "Reset assert failed %d\n", ret);  in intel_assert_device()
108 		dev_err(data->dev, "Reset deassert failed %d\n", ret);  in intel_deassert_device()
122 	ret = regmap_read(data->regmap, rst_stat, &val);  in intel_reset_status()
141 	if (spec->args[1] > 31)  in intel_reset_xlate()
142 		return -EINVAL;  in intel_reset_xlate()
144 	id = FIELD_PREP(REG_OFFSET_MASK, spec->args[0]);  in intel_reset_xlate()
145 	id |= FIELD_PREP(BIT_OFFSET_MASK, spec->args[1]);  in intel_reset_xlate()
147 	if (data->soc_data->legacy) {  in intel_reset_xlate()
148 		if (spec->args[2] > 31)  in intel_reset_xlate()
149 			return -EINVAL;  in intel_reset_xlate()
151 		id |= FIELD_PREP(STAT_BIT_OFFSET_MASK, spec->args[2]);  in intel_reset_xlate()
163 	intel_assert_device(&reset_data->rcdev, reset_data->reboot_id);  in intel_reset_restart_handler()
170 	struct device_node *np = pdev->dev.of_node;  in intel_reset_probe()
171 	struct device *dev = &pdev->dev;  in intel_reset_probe()
179 		return -ENOMEM;  in intel_reset_probe()
181 	data->soc_data = of_device_get_match_data(dev);  in intel_reset_probe()
182 	if (!data->soc_data)  in intel_reset_probe()
183 		return -ENODEV;  in intel_reset_probe()
189 	data->regmap = devm_regmap_init_mmio(dev, base,  in intel_reset_probe()
191 	if (IS_ERR(data->regmap)) {  in intel_reset_probe()
193 		return PTR_ERR(data->regmap);  in intel_reset_probe()
196 	ret = device_property_read_u32_array(dev, "intel,global-reset", rb_id,  in intel_reset_probe()
197 					     data->soc_data->reset_cell_count);  in intel_reset_probe()
199 		dev_err(dev, "Failed to get global reset offset!\n");  in intel_reset_probe()
203 	data->dev =			dev;  in intel_reset_probe()
204 	data->rcdev.of_node =		np;  in intel_reset_probe()
205 	data->rcdev.owner =		dev->driver->owner;  in intel_reset_probe()
206 	data->rcdev.ops	=		&intel_reset_ops;  in intel_reset_probe()
207 	data->rcdev.of_xlate =		intel_reset_xlate;  in intel_reset_probe()
208 	data->rcdev.of_reset_n_cells =	data->soc_data->reset_cell_count;  in intel_reset_probe()
209 	ret = devm_reset_controller_register(&pdev->dev, &data->rcdev);  in intel_reset_probe()
213 	data->reboot_id = FIELD_PREP(REG_OFFSET_MASK, rb_id[0]);  in intel_reset_probe()
214 	data->reboot_id |= FIELD_PREP(BIT_OFFSET_MASK, rb_id[1]);  in intel_reset_probe()
216 	if (data->soc_data->legacy)  in intel_reset_probe()
217 		data->reboot_id |= FIELD_PREP(STAT_BIT_OFFSET_MASK, rb_id[2]);  in intel_reset_probe()
219 	data->restart_nb.notifier_call =	intel_reset_restart_handler;  in intel_reset_probe()
220 	data->restart_nb.priority =		128;  in intel_reset_probe()
221 	register_restart_handler(&data->restart_nb);  in intel_reset_probe()
237 	{ .compatible = "intel,rcu-lgm", .data = &lgm_data },
238 	{ .compatible = "intel,rcu-xrx200", .data = &xrx200_data },
245 		.name = "intel-reset",
259  * specific devices to perform reset operation as part of initialization.