Commit | Line | Data |
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27f18dc2 RM |
1 | /* |
2 | * Broadcom specific AMBA | |
3 | * SPROM reading | |
4 | * | |
5 | * Licensed under the GNU/GPL. See COPYING for details. | |
6 | */ | |
7 | ||
8 | #include "bcma_private.h" | |
9 | ||
10 | #include <linux/bcma/bcma.h> | |
11 | #include <linux/bcma/bcma_regs.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/io.h> | |
14 | #include <linux/dma-mapping.h> | |
15 | #include <linux/slab.h> | |
16 | ||
17 | #define SPOFF(offset) ((offset) / sizeof(u16)) | |
18 | ||
19 | /************************************************** | |
20 | * R/W ops. | |
21 | **************************************************/ | |
22 | ||
23 | static void bcma_sprom_read(struct bcma_bus *bus, u16 *sprom) | |
24 | { | |
25 | int i; | |
26 | for (i = 0; i < SSB_SPROMSIZE_WORDS_R4; i++) | |
27 | sprom[i] = bcma_read16(bus->drv_cc.core, | |
28 | BCMA_CC_SPROM + (i * 2)); | |
29 | } | |
30 | ||
31 | /************************************************** | |
32 | * Validation. | |
33 | **************************************************/ | |
34 | ||
35 | static inline u8 bcma_crc8(u8 crc, u8 data) | |
36 | { | |
37 | /* Polynomial: x^8 + x^7 + x^6 + x^4 + x^2 + 1 */ | |
38 | static const u8 t[] = { | |
39 | 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B, | |
40 | 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21, | |
41 | 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF, | |
42 | 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5, | |
43 | 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14, | |
44 | 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E, | |
45 | 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80, | |
46 | 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA, | |
47 | 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95, | |
48 | 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF, | |
49 | 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01, | |
50 | 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B, | |
51 | 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA, | |
52 | 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0, | |
53 | 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E, | |
54 | 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34, | |
55 | 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0, | |
56 | 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A, | |
57 | 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54, | |
58 | 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E, | |
59 | 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF, | |
60 | 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5, | |
61 | 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B, | |
62 | 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61, | |
63 | 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E, | |
64 | 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74, | |
65 | 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA, | |
66 | 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0, | |
67 | 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41, | |
68 | 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B, | |
69 | 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5, | |
70 | 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F, | |
71 | }; | |
72 | return t[crc ^ data]; | |
73 | } | |
74 | ||
75 | static u8 bcma_sprom_crc(const u16 *sprom) | |
76 | { | |
77 | int word; | |
78 | u8 crc = 0xFF; | |
79 | ||
80 | for (word = 0; word < SSB_SPROMSIZE_WORDS_R4 - 1; word++) { | |
81 | crc = bcma_crc8(crc, sprom[word] & 0x00FF); | |
82 | crc = bcma_crc8(crc, (sprom[word] & 0xFF00) >> 8); | |
83 | } | |
84 | crc = bcma_crc8(crc, sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & 0x00FF); | |
85 | crc ^= 0xFF; | |
86 | ||
87 | return crc; | |
88 | } | |
89 | ||
90 | static int bcma_sprom_check_crc(const u16 *sprom) | |
91 | { | |
92 | u8 crc; | |
93 | u8 expected_crc; | |
94 | u16 tmp; | |
95 | ||
96 | crc = bcma_sprom_crc(sprom); | |
97 | tmp = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_CRC; | |
98 | expected_crc = tmp >> SSB_SPROM_REVISION_CRC_SHIFT; | |
99 | if (crc != expected_crc) | |
100 | return -EPROTO; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int bcma_sprom_valid(const u16 *sprom) | |
106 | { | |
107 | u16 revision; | |
108 | int err; | |
109 | ||
110 | err = bcma_sprom_check_crc(sprom); | |
111 | if (err) | |
112 | return err; | |
113 | ||
114 | revision = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_REV; | |
c54dcd19 | 115 | if (revision != 8 && revision != 9) { |
27f18dc2 RM |
116 | pr_err("Unsupported SPROM revision: %d\n", revision); |
117 | return -ENOENT; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /************************************************** | |
124 | * SPROM extraction. | |
125 | **************************************************/ | |
126 | ||
127 | static void bcma_sprom_extract_r8(struct bcma_bus *bus, const u16 *sprom) | |
128 | { | |
129 | u16 v; | |
130 | int i; | |
131 | ||
132 | for (i = 0; i < 3; i++) { | |
133 | v = sprom[SPOFF(SSB_SPROM8_IL0MAC) + i]; | |
134 | *(((__be16 *)bus->sprom.il0mac) + i) = cpu_to_be16(v); | |
135 | } | |
136 | } | |
137 | ||
138 | int bcma_sprom_get(struct bcma_bus *bus) | |
139 | { | |
140 | u16 *sprom; | |
141 | int err = 0; | |
142 | ||
143 | if (!bus->drv_cc.core) | |
144 | return -EOPNOTSUPP; | |
145 | ||
534e7a45 HM |
146 | if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM)) |
147 | return -ENOENT; | |
148 | ||
27f18dc2 RM |
149 | sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16), |
150 | GFP_KERNEL); | |
151 | if (!sprom) | |
152 | return -ENOMEM; | |
153 | ||
154 | bcma_sprom_read(bus, sprom); | |
155 | ||
156 | err = bcma_sprom_valid(sprom); | |
157 | if (err) | |
158 | goto out; | |
159 | ||
160 | bcma_sprom_extract_r8(bus, sprom); | |
161 | ||
162 | out: | |
163 | kfree(sprom); | |
164 | return err; | |
165 | } |