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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
bacfe09d DW |
2 | /* |
3 | * Compact binary representation of ihex records. Some devices need their | |
4 | * firmware loaded in strange orders rather than a single big blob, but | |
5 | * actually parsing ihex-as-text within the kernel seems silly. Thus,... | |
6 | */ | |
7 | ||
8 | #ifndef __LINUX_IHEX_H__ | |
9 | #define __LINUX_IHEX_H__ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/firmware.h> | |
f1485f3d | 13 | #include <linux/device.h> |
bacfe09d DW |
14 | |
15 | /* Intel HEX files actually limit the length to 256 bytes, but we have | |
16 | drivers which would benefit from using separate records which are | |
17 | longer than that, so we extend to 16 bits of length */ | |
18 | struct ihex_binrec { | |
19 | __be32 addr; | |
20 | __be16 len; | |
21 | uint8_t data[0]; | |
85ebd003 | 22 | } __attribute__((packed)); |
bacfe09d | 23 | |
9fb4ab4d AS |
24 | static inline uint16_t ihex_binrec_size(const struct ihex_binrec *p) |
25 | { | |
26 | return be16_to_cpu(p->len) + sizeof(*p); | |
27 | } | |
28 | ||
bacfe09d DW |
29 | /* Find the next record, taking into account the 4-byte alignment */ |
30 | static inline const struct ihex_binrec * | |
8092e792 | 31 | __ihex_next_binrec(const struct ihex_binrec *rec) |
bacfe09d | 32 | { |
9fb4ab4d | 33 | const void *p = rec; |
bacfe09d | 34 | |
9fb4ab4d | 35 | return p + ALIGN(ihex_binrec_size(rec), 4); |
8092e792 AS |
36 | } |
37 | ||
38 | static inline const struct ihex_binrec * | |
39 | ihex_next_binrec(const struct ihex_binrec *rec) | |
40 | { | |
41 | rec = __ihex_next_binrec(rec); | |
42 | ||
bacfe09d DW |
43 | return be16_to_cpu(rec->len) ? rec : NULL; |
44 | } | |
45 | ||
46 | /* Check that ihex_next_binrec() won't take us off the end of the image... */ | |
47 | static inline int ihex_validate_fw(const struct firmware *fw) | |
48 | { | |
8092e792 | 49 | const struct ihex_binrec *end, *rec; |
bacfe09d | 50 | |
8092e792 AS |
51 | rec = (const void *)fw->data; |
52 | end = (const void *)&fw->data[fw->size - sizeof(*end)]; | |
bacfe09d | 53 | |
8092e792 | 54 | for (; rec <= end; rec = __ihex_next_binrec(rec)) { |
bacfe09d | 55 | /* Zero length marks end of records */ |
5158c36e | 56 | if (rec == end && !be16_to_cpu(rec->len)) |
bacfe09d | 57 | return 0; |
bacfe09d DW |
58 | } |
59 | return -EINVAL; | |
60 | } | |
f1485f3d DW |
61 | |
62 | /* Request firmware and validate it so that we can trust we won't | |
63 | * run off the end while reading records... */ | |
64 | static inline int request_ihex_firmware(const struct firmware **fw, | |
65 | const char *fw_name, | |
66 | struct device *dev) | |
67 | { | |
68 | const struct firmware *lfw; | |
69 | int ret; | |
70 | ||
71 | ret = request_firmware(&lfw, fw_name, dev); | |
72 | if (ret) | |
73 | return ret; | |
74 | ret = ihex_validate_fw(lfw); | |
75 | if (ret) { | |
76 | dev_err(dev, "Firmware \"%s\" not valid IHEX records\n", | |
77 | fw_name); | |
78 | release_firmware(lfw); | |
79 | return ret; | |
80 | } | |
81 | *fw = lfw; | |
82 | return 0; | |
83 | } | |
bacfe09d | 84 | #endif /* __LINUX_IHEX_H__ */ |