1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
4 */
5
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/of.h>
9 #include <linux/mtd/mtd.h>
10 #include <linux/slab.h>
11 #include <linux/mtd/partitions.h>
12
13 #include "ofpart_bcm4908.h"
14
15 #define BLPARAMS_FW_OFFSET "NAND_RFS_OFS"
16
bcm4908_partitions_fw_offset(void)17 static long long bcm4908_partitions_fw_offset(void)
18 {
19 struct device_node *root;
20 struct property *prop;
21 const char *s;
22
23 root = of_find_node_by_path("/");
24 if (!root)
25 return -ENOENT;
26
27 of_property_for_each_string(root, "brcm_blparms", prop, s) {
28 size_t len = strlen(BLPARAMS_FW_OFFSET);
29 unsigned long offset;
30 int err;
31
32 if (strncmp(s, BLPARAMS_FW_OFFSET, len) || s[len] != '=')
33 continue;
34
35 err = kstrtoul(s + len + 1, 0, &offset);
36 if (err) {
37 pr_err("failed to parse %s\n", s + len + 1);
38 return err;
39 }
40
41 return offset << 10;
42 }
43
44 return -ENOENT;
45 }
46
bcm4908_partitions_post_parse(struct mtd_info * mtd,struct mtd_partition * parts,int nr_parts)47 int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts)
48 {
49 long long fw_offset;
50 int i;
51
52 fw_offset = bcm4908_partitions_fw_offset();
53
54 for (i = 0; i < nr_parts; i++) {
55 if (of_device_is_compatible(parts[i].of_node, "brcm,bcm4908-firmware")) {
56 if (fw_offset < 0 || parts[i].offset == fw_offset)
57 parts[i].name = "firmware";
58 else
59 parts[i].name = "backup";
60 }
61 }
62
63 return 0;
64 }
65