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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
3271e610 SA |
2 | #ifndef __LINUX_BCM963XX_NVRAM_H__ |
3 | #define __LINUX_BCM963XX_NVRAM_H__ | |
4 | ||
5 | #include <linux/crc32.h> | |
6 | #include <linux/if_ether.h> | |
7 | #include <linux/sizes.h> | |
8 | #include <linux/types.h> | |
9 | ||
10 | /* | |
11 | * Broadcom BCM963xx SoC board nvram data structure. | |
12 | * | |
13 | * The nvram structure varies in size depending on the SoC board version. Use | |
14 | * the appropriate minimum BCM963XX_NVRAM_*_SIZE define for the information | |
15 | * you need instead of sizeof(struct bcm963xx_nvram) as this may change. | |
16 | */ | |
17 | ||
18 | #define BCM963XX_NVRAM_V4_SIZE 300 | |
19 | #define BCM963XX_NVRAM_V5_SIZE (1 * SZ_1K) | |
20 | ||
21 | #define BCM963XX_DEFAULT_PSI_SIZE 64 | |
22 | ||
23 | enum bcm963xx_nvram_nand_part { | |
24 | BCM963XX_NVRAM_NAND_PART_BOOT = 0, | |
25 | BCM963XX_NVRAM_NAND_PART_ROOTFS_1, | |
26 | BCM963XX_NVRAM_NAND_PART_ROOTFS_2, | |
27 | BCM963XX_NVRAM_NAND_PART_DATA, | |
28 | BCM963XX_NVRAM_NAND_PART_BBT, | |
29 | ||
30 | __BCM963XX_NVRAM_NAND_NR_PARTS | |
31 | }; | |
32 | ||
33 | struct bcm963xx_nvram { | |
34 | u32 version; | |
35 | char bootline[256]; | |
36 | char name[16]; | |
37 | u32 main_tp_number; | |
38 | u32 psi_size; | |
39 | u32 mac_addr_count; | |
40 | u8 mac_addr_base[ETH_ALEN]; | |
41 | u8 __reserved1[2]; | |
42 | u32 checksum_v4; | |
43 | ||
44 | u8 __reserved2[292]; | |
45 | u32 nand_part_offset[__BCM963XX_NVRAM_NAND_NR_PARTS]; | |
46 | u32 nand_part_size[__BCM963XX_NVRAM_NAND_NR_PARTS]; | |
47 | u8 __reserved3[388]; | |
48 | u32 checksum_v5; | |
49 | }; | |
50 | ||
51 | #define BCM963XX_NVRAM_NAND_PART_OFFSET(nvram, part) \ | |
52 | bcm963xx_nvram_nand_part_offset(nvram, BCM963XX_NVRAM_NAND_PART_ ##part) | |
53 | ||
54 | static inline u64 __pure bcm963xx_nvram_nand_part_offset( | |
55 | const struct bcm963xx_nvram *nvram, | |
56 | enum bcm963xx_nvram_nand_part part) | |
57 | { | |
58 | return nvram->nand_part_offset[part] * SZ_1K; | |
59 | } | |
60 | ||
61 | #define BCM963XX_NVRAM_NAND_PART_SIZE(nvram, part) \ | |
62 | bcm963xx_nvram_nand_part_size(nvram, BCM963XX_NVRAM_NAND_PART_ ##part) | |
63 | ||
64 | static inline u64 __pure bcm963xx_nvram_nand_part_size( | |
65 | const struct bcm963xx_nvram *nvram, | |
66 | enum bcm963xx_nvram_nand_part part) | |
67 | { | |
68 | return nvram->nand_part_size[part] * SZ_1K; | |
69 | } | |
70 | ||
71 | /* | |
72 | * bcm963xx_nvram_checksum - Verify nvram checksum | |
73 | * | |
74 | * @nvram: pointer to full size nvram data structure | |
75 | * @expected_out: optional pointer to store expected checksum value | |
76 | * @actual_out: optional pointer to store actual checksum value | |
77 | * | |
78 | * Return: 0 if the checksum is valid, otherwise -EINVAL | |
79 | */ | |
80 | static int __maybe_unused bcm963xx_nvram_checksum( | |
81 | const struct bcm963xx_nvram *nvram, | |
82 | u32 *expected_out, u32 *actual_out) | |
83 | { | |
84 | u32 expected, actual; | |
85 | size_t len; | |
86 | ||
87 | if (nvram->version <= 4) { | |
88 | expected = nvram->checksum_v4; | |
89 | len = BCM963XX_NVRAM_V4_SIZE - sizeof(u32); | |
90 | } else { | |
91 | expected = nvram->checksum_v5; | |
92 | len = BCM963XX_NVRAM_V5_SIZE - sizeof(u32); | |
93 | } | |
94 | ||
95 | /* | |
96 | * Calculate the CRC32 value for the nvram with a checksum value | |
97 | * of 0 without modifying or copying the nvram by combining: | |
98 | * - The CRC32 of the nvram without the checksum value | |
99 | * - The CRC32 of a zero checksum value (which is also 0) | |
100 | */ | |
101 | actual = crc32_le_combine( | |
102 | crc32_le(~0, (u8 *)nvram, len), 0, sizeof(u32)); | |
103 | ||
104 | if (expected_out) | |
105 | *expected_out = expected; | |
106 | ||
107 | if (actual_out) | |
108 | *actual_out = actual; | |
109 | ||
110 | return expected == actual ? 0 : -EINVAL; | |
111 | }; | |
112 | ||
113 | #endif /* __LINUX_BCM963XX_NVRAM_H__ */ |