Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm / 27f18dc2dafe66a93c7101fc94201b8c83903597 / . / drivers / bcma / sprom.c
blob: ffbb0e32e9216bc9985700ca71a8ee3d80a6eeee [file] [log] [blame]
Rafał Miłecki27f18dc2011-06-02 02:08:51 +0200[diff] [blame^]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
23static 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
35static 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
75static 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
90static 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
105static 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;
115 if (revision != 8) {
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
127static 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
138int 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
146 sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
147 GFP_KERNEL);
148 if (!sprom)
149 return -ENOMEM;
150
151 bcma_sprom_read(bus, sprom);
152
153 err = bcma_sprom_valid(sprom);
154 if (err)
155 goto out;
156
157 bcma_sprom_extract_r8(bus, sprom);
158
159out:
160 kfree(sprom);
161 return err;
162}