projects/linux·blob master · refs

164 lines · 4.1 KiB

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 "ssb_private.h"
9
10#include <linux/ssb/ssb.h>
11
12static struct resource ssb_sflash_resource = {
13 .name = "ssb_sflash",
14 .start = SSB_FLASH2,
15 .end = 0,
16 .flags = IORESOURCE_MEM | IORESOURCE_READONLY,
17};
18
19struct platform_device ssb_sflash_dev = {
20 .name = "ssb_sflash",
21 .resource = &ssb_sflash_resource,
22 .num_resources = 1,
23};
24
25struct ssb_sflash_tbl_e {
26 char *name;
27 u32 id;
28 u32 blocksize;
29 u16 numblocks;
30};
31
32static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
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, },
40 { NULL },
41};
42
43static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
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, },
58 { NULL },
59};
60
61static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
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, },
69 { NULL },
70};
71
72static 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 dev_err(cc->dev->dev, "SFLASH control command failed (timeout)!\n");
84}
85
86/* Initialize serial flash access */
87int ssb_sflash_init(struct ssb_chipcommon *cc)
88{
89 struct ssb_sflash *sflash = &cc->dev->bus->mipscore.sflash;
90 const struct ssb_sflash_tbl_e *e;
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
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
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);
156
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
163 return 0;
164}