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1 | /* |
2 | * Broadcom specific AMBA |
3 | * ChipCommon serial flash interface |
4 | * |
5 | * Licensed under the GNU/GPL. See COPYING for details. |
6 | */ |
7 | |
8 | #include "bcma_private.h" |
9 | |
10 | #include <linux/platform_device.h> |
11 | #include <linux/bcma/bcma.h> |
12 | |
13 | static struct resource bcma_sflash_resource = { |
14 | .name = "bcma_sflash", |
15 | .start = BCMA_SOC_FLASH2, |
16 | .end = 0, |
17 | .flags = IORESOURCE_MEM | IORESOURCE_READONLY, |
18 | }; |
19 | |
20 | struct platform_device bcma_sflash_dev = { |
21 | .name = "bcma_sflash", |
22 | .resource = &bcma_sflash_resource, |
23 | .num_resources = 1, |
24 | }; |
25 | |
26 | struct bcma_sflash_tbl_e { |
27 | char *name; |
28 | u32 id; |
29 | u32 blocksize; |
30 | u16 numblocks; |
31 | }; |
32 | |
33 | static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = { |
34 | { "M25P20", 0x11, 0x10000, 4, }, |
35 | { "M25P40", 0x12, 0x10000, 8, }, |
36 | |
37 | { "M25P16", 0x14, 0x10000, 32, }, |
38 | { "M25P32", 0x15, 0x10000, 64, }, |
39 | { "M25P64", 0x16, 0x10000, 128, }, |
40 | { "M25FL128", 0x17, 0x10000, 256, }, |
41 | { 0 }, |
42 | }; |
43 | |
44 | static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = { |
45 | { "SST25WF512", 1, 0x1000, 16, }, |
46 | { "SST25VF512", 0x48, 0x1000, 16, }, |
47 | { "SST25WF010", 2, 0x1000, 32, }, |
48 | { "SST25VF010", 0x49, 0x1000, 32, }, |
49 | { "SST25WF020", 3, 0x1000, 64, }, |
50 | { "SST25VF020", 0x43, 0x1000, 64, }, |
51 | { "SST25WF040", 4, 0x1000, 128, }, |
52 | { "SST25VF040", 0x44, 0x1000, 128, }, |
53 | { "SST25VF040B", 0x8d, 0x1000, 128, }, |
54 | { "SST25WF080", 5, 0x1000, 256, }, |
55 | { "SST25VF080B", 0x8e, 0x1000, 256, }, |
56 | { "SST25VF016", 0x41, 0x1000, 512, }, |
57 | { "SST25VF032", 0x4a, 0x1000, 1024, }, |
58 | { "SST25VF064", 0x4b, 0x1000, 2048, }, |
59 | { 0 }, |
60 | }; |
61 | |
62 | static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = { |
63 | { "AT45DB011", 0xc, 256, 512, }, |
64 | { "AT45DB021", 0x14, 256, 1024, }, |
65 | { "AT45DB041", 0x1c, 256, 2048, }, |
66 | { "AT45DB081", 0x24, 256, 4096, }, |
67 | { "AT45DB161", 0x2c, 512, 4096, }, |
68 | { "AT45DB321", 0x34, 512, 8192, }, |
69 | { "AT45DB642", 0x3c, 1024, 8192, }, |
70 | { 0 }, |
71 | }; |
72 | |
73 | static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode) |
74 | { |
75 | int i; |
76 | bcma_cc_write32(cc, BCMA_CC_FLASHCTL, |
77 | BCMA_CC_FLASHCTL_START | opcode); |
78 | for (i = 0; i < 1000; i++) { |
79 | if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) & |
80 | BCMA_CC_FLASHCTL_BUSY)) |
81 | return; |
82 | cpu_relax(); |
83 | } |
84 | bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n"); |
85 | } |
86 | |
87 | /* Initialize serial flash access */ |
88 | int bcma_sflash_init(struct bcma_drv_cc *cc) |
89 | { |
90 | struct bcma_bus *bus = cc->core->bus; |
91 | struct bcma_sflash *sflash = &cc->sflash; |
92 | struct bcma_sflash_tbl_e *e; |
93 | u32 id, id2; |
94 | |
95 | switch (cc->capabilities & BCMA_CC_CAP_FLASHT) { |
96 | case BCMA_CC_FLASHT_STSER: |
97 | bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP); |
98 | |
99 | bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0); |
100 | bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES); |
101 | id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA); |
102 | |
103 | bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1); |
104 | bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES); |
105 | id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA); |
106 | |
107 | switch (id) { |
108 | case 0xbf: |
109 | for (e = bcma_sflash_sst_tbl; e->name; e++) { |
110 | if (e->id == id2) |
111 | break; |
112 | } |
113 | break; |
114 | case 0x13: |
115 | return -ENOTSUPP; |
116 | default: |
117 | for (e = bcma_sflash_st_tbl; e->name; e++) { |
118 | if (e->id == id) |
119 | break; |
120 | } |
121 | break; |
122 | } |
123 | if (!e->name) { |
124 | bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2); |
125 | return -ENOTSUPP; |
126 | } |
127 | |
128 | break; |
129 | case BCMA_CC_FLASHT_ATSER: |
130 | bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS); |
131 | id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c; |
132 | |
133 | for (e = bcma_sflash_at_tbl; e->name; e++) { |
134 | if (e->id == id) |
135 | break; |
136 | } |
137 | if (!e->name) { |
138 | bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id); |
139 | return -ENOTSUPP; |
140 | } |
141 | |
142 | break; |
143 | default: |
144 | bcma_err(bus, "Unsupported flash type\n"); |
145 | return -ENOTSUPP; |
146 | } |
147 | |
148 | sflash->window = BCMA_SOC_FLASH2; |
149 | sflash->blocksize = e->blocksize; |
150 | sflash->numblocks = e->numblocks; |
151 | sflash->size = sflash->blocksize * sflash->numblocks; |
152 | sflash->present = true; |
153 | |
154 | bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n", |
155 | e->name, sflash->size / 1024, sflash->blocksize, |
156 | sflash->numblocks); |
157 | |
158 | /* Prepare platform device, but don't register it yet. It's too early, |
159 | * malloc (required by device_private_init) is not available yet. */ |
160 | bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start + |
161 | sflash->size; |
162 | bcma_sflash_dev.dev.platform_data = sflash; |
163 | |
164 | return 0; |
165 | } |
166 |
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