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72a525cb RM |
1 | /* |
2 | * Sonics Silicon Backplane | |
3 | * ChipCommon serial flash interface | |
4 | * | |
5 | * Licensed under the GNU/GPL. See COPYING for details. | |
6 | */ | |
7 | ||
8 | #include <linux/ssb/ssb.h> | |
9 | ||
10 | #include "ssb_private.h" | |
11 | ||
7b5d6043 RM |
12 | static struct resource ssb_sflash_resource = { |
13 | .name = "ssb_sflash", | |
14 | .start = SSB_FLASH2, | |
15 | .end = 0, | |
16 | .flags = IORESOURCE_MEM | IORESOURCE_READONLY, | |
17 | }; | |
18 | ||
19 | struct platform_device ssb_sflash_dev = { | |
20 | .name = "ssb_sflash", | |
21 | .resource = &ssb_sflash_resource, | |
22 | .num_resources = 1, | |
23 | }; | |
24 | ||
59015278 RM |
25 | struct ssb_sflash_tbl_e { |
26 | char *name; | |
27 | u32 id; | |
28 | u32 blocksize; | |
29 | u16 numblocks; | |
30 | }; | |
31 | ||
39cd206c | 32 | static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = { |
59015278 RM |
33 | { "M25P20", 0x11, 0x10000, 4, }, |
34 | { "M25P40", 0x12, 0x10000, 8, }, | |
35 | ||
36 | { "M25P16", 0x14, 0x10000, 32, }, | |
37 | { "M25P32", 0x15, 0x10000, 64, }, | |
38 | { "M25P64", 0x16, 0x10000, 128, }, | |
39 | { "M25FL128", 0x17, 0x10000, 256, }, | |
c9e4a3fb | 40 | { NULL }, |
59015278 RM |
41 | }; |
42 | ||
39cd206c | 43 | static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = { |
59015278 RM |
44 | { "SST25WF512", 1, 0x1000, 16, }, |
45 | { "SST25VF512", 0x48, 0x1000, 16, }, | |
46 | { "SST25WF010", 2, 0x1000, 32, }, | |
47 | { "SST25VF010", 0x49, 0x1000, 32, }, | |
48 | { "SST25WF020", 3, 0x1000, 64, }, | |
49 | { "SST25VF020", 0x43, 0x1000, 64, }, | |
50 | { "SST25WF040", 4, 0x1000, 128, }, | |
51 | { "SST25VF040", 0x44, 0x1000, 128, }, | |
52 | { "SST25VF040B", 0x8d, 0x1000, 128, }, | |
53 | { "SST25WF080", 5, 0x1000, 256, }, | |
54 | { "SST25VF080B", 0x8e, 0x1000, 256, }, | |
55 | { "SST25VF016", 0x41, 0x1000, 512, }, | |
56 | { "SST25VF032", 0x4a, 0x1000, 1024, }, | |
57 | { "SST25VF064", 0x4b, 0x1000, 2048, }, | |
c9e4a3fb | 58 | { NULL }, |
59015278 RM |
59 | }; |
60 | ||
39cd206c | 61 | static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = { |
59015278 RM |
62 | { "AT45DB011", 0xc, 256, 512, }, |
63 | { "AT45DB021", 0x14, 256, 1024, }, | |
64 | { "AT45DB041", 0x1c, 256, 2048, }, | |
65 | { "AT45DB081", 0x24, 256, 4096, }, | |
66 | { "AT45DB161", 0x2c, 512, 4096, }, | |
67 | { "AT45DB321", 0x34, 512, 8192, }, | |
68 | { "AT45DB642", 0x3c, 1024, 8192, }, | |
c9e4a3fb | 69 | { NULL }, |
59015278 RM |
70 | }; |
71 | ||
72 | static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode) | |
73 | { | |
74 | int i; | |
75 | chipco_write32(cc, SSB_CHIPCO_FLASHCTL, | |
76 | SSB_CHIPCO_FLASHCTL_START | opcode); | |
77 | for (i = 0; i < 1000; i++) { | |
78 | if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) & | |
79 | SSB_CHIPCO_FLASHCTL_BUSY)) | |
80 | return; | |
81 | cpu_relax(); | |
82 | } | |
83 | pr_err("SFLASH control command failed (timeout)!\n"); | |
84 | } | |
85 | ||
72a525cb RM |
86 | /* Initialize serial flash access */ |
87 | int ssb_sflash_init(struct ssb_chipcommon *cc) | |
88 | { | |
e570bd04 | 89 | struct ssb_sflash *sflash = &cc->dev->bus->mipscore.sflash; |
39cd206c | 90 | const struct ssb_sflash_tbl_e *e; |
59015278 RM |
91 | u32 id, id2; |
92 | ||
93 | switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) { | |
94 | case SSB_CHIPCO_FLASHT_STSER: | |
95 | ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP); | |
96 | ||
97 | chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0); | |
98 | ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES); | |
99 | id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA); | |
100 | ||
101 | chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1); | |
102 | ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES); | |
103 | id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA); | |
104 | ||
105 | switch (id) { | |
106 | case 0xbf: | |
107 | for (e = ssb_sflash_sst_tbl; e->name; e++) { | |
108 | if (e->id == id2) | |
109 | break; | |
110 | } | |
111 | break; | |
112 | case 0x13: | |
113 | return -ENOTSUPP; | |
114 | default: | |
115 | for (e = ssb_sflash_st_tbl; e->name; e++) { | |
116 | if (e->id == id) | |
117 | break; | |
118 | } | |
119 | break; | |
120 | } | |
121 | if (!e->name) { | |
122 | pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", | |
123 | id, id2); | |
124 | return -ENOTSUPP; | |
125 | } | |
126 | ||
127 | break; | |
128 | case SSB_CHIPCO_FLASHT_ATSER: | |
129 | ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS); | |
130 | id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c; | |
131 | ||
132 | for (e = ssb_sflash_at_tbl; e->name; e++) { | |
133 | if (e->id == id) | |
134 | break; | |
135 | } | |
136 | if (!e->name) { | |
137 | pr_err("Unsupported Atmel serial flash (id: 0x%X)\n", | |
138 | id); | |
139 | return -ENOTSUPP; | |
140 | } | |
141 | ||
142 | break; | |
143 | default: | |
144 | pr_err("Unsupported flash type\n"); | |
145 | return -ENOTSUPP; | |
146 | } | |
147 | ||
e570bd04 RM |
148 | sflash->window = SSB_FLASH2; |
149 | sflash->blocksize = e->blocksize; | |
150 | sflash->numblocks = e->numblocks; | |
151 | sflash->size = sflash->blocksize * sflash->numblocks; | |
152 | sflash->present = true; | |
153 | ||
092c4649 RM |
154 | pr_info("Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n", |
155 | e->name, sflash->size / 1024, e->blocksize, e->numblocks); | |
59015278 | 156 | |
7b5d6043 RM |
157 | /* Prepare platform device, but don't register it yet. It's too early, |
158 | * malloc (required by device_private_init) is not available yet. */ | |
159 | ssb_sflash_dev.resource[0].end = ssb_sflash_dev.resource[0].start + | |
160 | sflash->size; | |
161 | ssb_sflash_dev.dev.platform_data = sflash; | |
162 | ||
092c4649 | 163 | return 0; |
72a525cb | 164 | } |