1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2022 - 2023 Rafał Miłecki <rafal@milecki.pl>
10 #include <linux/nvmem-consumer.h>
11 #include <linux/nvmem-provider.h>
15 #include "u-boot-env.h"
40 	if (bytes != 3 * ETH_ALEN - 1)  in u_boot_env_read_post_process_ethaddr()
41 		return -EINVAL;  in u_boot_env_read_post_process_ethaddr()
44 		return -EINVAL;  in u_boot_env_read_post_process_ethaddr()
54 static int u_boot_env_parse_cells(struct device *dev, struct nvmem_device *nvmem, uint8_t *buf,  in u_boot_env_parse_cells()  argument
73 			return -ENOMEM;  in u_boot_env_parse_cells()
74 		info.offset = data_offset + value - data;  in u_boot_env_parse_cells()
76 		info.np = of_get_child_by_name(dev->of_node, info.name);  in u_boot_env_parse_cells()
83 		nvmem_add_one_cell(nvmem, &info);  in u_boot_env_parse_cells()
89 int u_boot_env_parse(struct device *dev, struct nvmem_device *nvmem,  in u_boot_env_parse()  argument
105 	dev_size = nvmem_dev_size(nvmem);  in u_boot_env_parse()
109 		err = -ENOMEM;  in u_boot_env_parse()
113 	bytes = nvmem_device_read(nvmem, 0, dev_size, buf);  in u_boot_env_parse()
118 		err = -EIO;  in u_boot_env_parse()
141 		dev_err(dev, "Device too small for u-boot-env\n");  in u_boot_env_parse()
142 		err = -EIO;  in u_boot_env_parse()
148 	crc32_data_len = dev_size - crc32_data_offset;  in u_boot_env_parse()
149 	data_len = dev_size - data_offset;  in u_boot_env_parse()
154 		err = -EINVAL;  in u_boot_env_parse()
158 	buf[dev_size - 1] = '\0';  in u_boot_env_parse()
159 	err = u_boot_env_parse_cells(dev, nvmem, buf, data_offset, data_len);  in u_boot_env_parse()
168 static int u_boot_env_add_cells(struct nvmem_layout *layout)  in u_boot_env_add_cells()  argument
170 	struct device *dev = &layout->dev;  in u_boot_env_add_cells()
175 	return u_boot_env_parse(dev, layout->nvmem, format);  in u_boot_env_add_cells()
178 static int u_boot_env_probe(struct nvmem_layout *layout)  in u_boot_env_probe()  argument
180 	layout->add_cells = u_boot_env_add_cells;  in u_boot_env_probe()
182 	return nvmem_layout_register(layout);  in u_boot_env_probe()
185 static void u_boot_env_remove(struct nvmem_layout *layout)  in u_boot_env_remove()  argument
187 	nvmem_layout_unregister(layout);  in u_boot_env_remove()
191 	{ .compatible = "u-boot,env", .data = (void *)U_BOOT_FORMAT_SINGLE, },
192 	{ .compatible = "u-boot,env-redundant-bool", .data = (void *)U_BOOT_FORMAT_REDUNDANT, },
193 	{ .compatible = "u-boot,env-redundant-count", .data = (void *)U_BOOT_FORMAT_REDUNDANT, },
200 		.name = "u-boot-env-layout",
211 MODULE_DESCRIPTION("NVMEM layout driver for U-Boot environment variables");