xref: /openbmc/linux/drivers/bcma/sprom.c (revision 9c1f8594)
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 offset, 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 				       offset + (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;
115 	if (revision != 8 && revision != 9) {
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 offset;
141 	u16 *sprom;
142 	int err = 0;
143 
144 	if (!bus->drv_cc.core)
145 		return -EOPNOTSUPP;
146 
147 	if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
148 		return -ENOENT;
149 
150 	sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
151 			GFP_KERNEL);
152 	if (!sprom)
153 		return -ENOMEM;
154 
155 	/* Most cards have SPROM moved by additional offset 0x30 (48 dwords).
156 	 * According to brcm80211 this applies to cards with PCIe rev >= 6
157 	 * TODO: understand this condition and use it */
158 	offset = (bus->chipinfo.id == 0x4331) ? BCMA_CC_SPROM :
159 		BCMA_CC_SPROM_PCIE6;
160 	bcma_sprom_read(bus, offset, sprom);
161 
162 	err = bcma_sprom_valid(sprom);
163 	if (err)
164 		goto out;
165 
166 	bcma_sprom_extract_r8(bus, sprom);
167 
168 out:
169 	kfree(sprom);
170 	return err;
171 }
172