1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
8  * Baikal-T1 CM2 L2-cache Control Block driver.
38  * struct l2_ctl - Baikal-T1 L2 Control block private data.
40  * @sys_regs: Baikal-T1 System Controller registers map.
49  * enum l2_ctl_stall - Baikal-T1 L2-cache-RAM stall identifier.
50  * @L2_WSSTALL: Way-select latency.
61  * struct l2_ctl_device_attribute - Baikal-T1 L2-cache device attribute.
63  * @id: L2-cache stall field identifier.
82 	ret = regmap_read(l2->sys_regs, L2_CTL_REG, &data);  in l2_ctl_get_latency()
97 		return -EINVAL;  in l2_ctl_get_latency()
124 		return -EINVAL;  in l2_ctl_set_latency()
130 	ret = regmap_update_bits(l2->sys_regs, L2_CTL_REG, mask, data);  in l2_ctl_set_latency()
134 	return regmap_read_poll_timeout(l2->sys_regs, L2_CTL_REG, data,  in l2_ctl_set_latency()
143 	struct platform_device *pdev = to_platform_device(l2->dev);  in l2_ctl_clear_data()
150 	struct device *dev = &pdev->dev;  in l2_ctl_create_data()
156 		return ERR_PTR(-ENOMEM);  in l2_ctl_create_data()
164 	l2->dev = dev;  in l2_ctl_create_data()
172 	l2->sys_regs = syscon_node_to_regmap(l2->dev->of_node->parent);  in l2_ctl_find_sys_regs()
173 	if (IS_ERR(l2->sys_regs)) {  in l2_ctl_find_sys_regs()
174 		dev_err(l2->dev, "Couldn't get L2 CTL register map\n");  in l2_ctl_find_sys_regs()
175 		return PTR_ERR(l2->sys_regs);  in l2_ctl_find_sys_regs()
187 	if (!of_property_read_u32(l2->dev->of_node, propname, &data)) {  in l2_ctl_of_parse_property()
190 			dev_err(l2->dev, "Invalid value of '%s'\n", propname);  in l2_ctl_of_parse_property()
200 	ret = l2_ctl_of_parse_property(l2, L2_WS_STALL, "baikal,l2-ws-latency");  in l2_ctl_of_parse()
204 	ret = l2_ctl_of_parse_property(l2, L2_TAG_STALL, "baikal,l2-tag-latency");  in l2_ctl_of_parse()
209 					"baikal,l2-data-latency");  in l2_ctl_of_parse()
221 	ret = l2_ctl_get_latency(l2, devattr->id, &data);  in l2_ctl_latency_show()
238 		return -EINVAL;  in l2_ctl_latency_store()
240 	ret = l2_ctl_set_latency(l2, devattr->id, data);  in l2_ctl_latency_store()
263 	device_remove_groups(l2->dev, l2_ctl_sysfs_groups);  in l2_ctl_remove_sysfs()
270 	ret = device_add_groups(l2->dev, l2_ctl_sysfs_groups);  in l2_ctl_init_sysfs()
272 		dev_err(l2->dev, "Failed to create L2 CTL sysfs nodes\n");  in l2_ctl_init_sysfs()
276 	ret = devm_add_action_or_reset(l2->dev, l2_ctl_remove_sysfs, l2);  in l2_ctl_init_sysfs()
278 		dev_err(l2->dev, "Can't add L2 CTL sysfs remove action\n");  in l2_ctl_init_sysfs()
308 	{ .compatible = "baikal,bt1-l2-ctl" },
316 		.name = "bt1-l2-ctl",
323 MODULE_DESCRIPTION("Baikal-T1 L2-cache driver");