1 // SPDX-License-Identifier: GPL-2.0-only
8  * Baikal-T1 CCU Resets interface driver
11 #define pr_fmt(fmt) "bt1-ccu-rst: " fmt
19 #include <linux/reset-controller.h>
22 #include <dt-bindings/reset/bt1-ccu.h>
24 #include "ccu-rst.h"
66  * Each AXI-bus clock divider is equipped with the corresponding clock-consumer
67  * domain reset (it's self-deasserted reset control).
84  * SATA reference clock domain and APB-bus domain are connected with the
85  * sefl-deasserted reset control, which can be activated via the corresponding
86  * clock divider register. DDR and PCIe sub-domains can be reset with directly
107 	const struct ccu_rst_info *info = &rst->rsts_info[idx];  in ccu_rst_reset()
109 	if (info->type != CCU_RST_TRIG)  in ccu_rst_reset()
110 		return -EOPNOTSUPP;  in ccu_rst_reset()
112 	regmap_update_bits(rst->sys_regs, info->base, info->mask, info->mask);  in ccu_rst_reset()
124 	const struct ccu_rst_info *info = &rst->rsts_info[idx];  in ccu_rst_set()
126 	if (info->type != CCU_RST_DIR)  in ccu_rst_set()
127 		return high ? -EOPNOTSUPP : 0;  in ccu_rst_set()
129 	return regmap_update_bits(rst->sys_regs, info->base,  in ccu_rst_set()
130 				  info->mask, high ? info->mask : 0);  in ccu_rst_set()
149 	const struct ccu_rst_info *info = &rst->rsts_info[idx];  in ccu_rst_status()
152 	if (info->type != CCU_RST_DIR)  in ccu_rst_status()
153 		return -EOPNOTSUPP;  in ccu_rst_status()
155 	regmap_read(rst->sys_regs, info->base, &val);  in ccu_rst_status()
157 	return !!(val & info->mask);  in ccu_rst_status()
173 		return ERR_PTR(-EINVAL);  in ccu_rst_hw_register()
177 		return ERR_PTR(-ENOMEM);  in ccu_rst_hw_register()
179 	rst->sys_regs = rst_init->sys_regs;  in ccu_rst_hw_register()
180 	if (of_device_is_compatible(rst_init->np, "baikal,bt1-ccu-axi")) {  in ccu_rst_hw_register()
181 		rst->rcdev.nr_resets = ARRAY_SIZE(axi_rst_info);  in ccu_rst_hw_register()
182 		rst->rsts_info = axi_rst_info;  in ccu_rst_hw_register()
183 	} else if (of_device_is_compatible(rst_init->np, "baikal,bt1-ccu-sys")) {  in ccu_rst_hw_register()
184 		rst->rcdev.nr_resets = ARRAY_SIZE(sys_rst_info);  in ccu_rst_hw_register()
185 		rst->rsts_info = sys_rst_info;  in ccu_rst_hw_register()
188 		       of_node_full_name(rst_init->np));  in ccu_rst_hw_register()
189 		ret = -EINVAL;  in ccu_rst_hw_register()
193 	rst->rcdev.owner = THIS_MODULE;  in ccu_rst_hw_register()
194 	rst->rcdev.ops = &ccu_rst_ops;  in ccu_rst_hw_register()
195 	rst->rcdev.of_node = rst_init->np;  in ccu_rst_hw_register()
197 	ret = reset_controller_register(&rst->rcdev);  in ccu_rst_hw_register()
200 		       of_node_full_name(rst_init->np));  in ccu_rst_hw_register()
214 	reset_controller_unregister(&rst->rcdev);  in ccu_rst_hw_unregister()