1 // SPDX-License-Identifier: GPL-2.0+
9 #include <linux/nvmem-provider.h>
14 struct rmem {  struct
16 	struct nvmem_device *nvmem;  member
21 	int (*checksum)(struct rmem *priv);  argument
35 	struct rmem *priv = context;  in rmem_read()
38 	if ((phys_addr_t)offset + bytes > priv->mem->size)  in rmem_read()
39 		return -EIO;  in rmem_read()
44 	 * uses-cases for this driver, the performance hit isn't a concern.  in rmem_read()
45 	 * Nor is likely to be, given the nature of the subsystem. Most nvmem  in rmem_read()
51 	addr = memremap(priv->mem->base, priv->mem->size, MEMREMAP_WB);  in rmem_read()
53 		dev_err(priv->dev, "Failed to remap memory region\n");  in rmem_read()
54 		return -ENOMEM;  in rmem_read()
64 static int rmem_eyeq5_checksum(struct rmem *priv)  in rmem_eyeq5_checksum()
77 		return -EINVAL;  in rmem_eyeq5_checksum()
83 	if (header.size > priv->mem->size)  in rmem_eyeq5_checksum()
84 		return -EINVAL;  in rmem_eyeq5_checksum()
87 	 *           0 +-------------------+  in rmem_eyeq5_checksum()
89 	 *             +-------------------+ |  in rmem_eyeq5_checksum()
93 	 *   data_size +-------------------+  in rmem_eyeq5_checksum()
95 	 * header.size +-------------------+  in rmem_eyeq5_checksum()
100 		return -ENOMEM;  in rmem_eyeq5_checksum()
106 	data_size = header.size - sizeof(*target_crc);  in rmem_eyeq5_checksum()
113 	dev_err(priv->dev,  in rmem_eyeq5_checksum()
116 	return -EINVAL;  in rmem_eyeq5_checksum()
122 	struct device *dev = &pdev->dev;  in rmem_probe()
125 	struct rmem *priv;  in rmem_probe()
129 		return -ENOMEM;  in rmem_probe()
130 	priv->dev = dev;  in rmem_probe()
132 	mem = of_reserved_mem_lookup(dev->of_node);  in rmem_probe()
135 		return -EINVAL;  in rmem_probe()
137 	priv->mem = mem;  in rmem_probe()
141 	config.name = "rmem";  in rmem_probe()
143 	config.size = mem->size;  in rmem_probe()
146 	if (match_data && match_data->checksum) {  in rmem_probe()
147 		int ret = match_data->checksum(priv);  in rmem_probe()
161 	{ .compatible = "mobileye,eyeq5-bootloader-config", .data = &rmem_eyeq5_match_data },
162 	{ .compatible = "nvmem-rmem", },
170 		.name = "rmem",
177 MODULE_DESCRIPTION("Reserved Memory Based nvmem Driver");