1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* Common Flash Interface support:
* Generic utility functions not dependant on command set
*
* Copyright (C) 2002 Red Hat
* Copyright (C) 2003 STMicroelectronics Limited
*
* This code is covered by the GPL.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mtd/xip.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/compatmac.h>
int __xipram cfi_qry_present(struct map_info *map, __u32 base,
struct cfi_private *cfi)
{
int osf = cfi->interleave * cfi->device_type; /* scale factor */
map_word val[3];
map_word qry[3];
qry[0] = cfi_build_cmd('Q', map, cfi);
qry[1] = cfi_build_cmd('R', map, cfi);
qry[2] = cfi_build_cmd('Y', map, cfi);
val[0] = map_read(map, base + osf*0x10);
val[1] = map_read(map, base + osf*0x11);
val[2] = map_read(map, base + osf*0x12);
if (!map_word_equal(map, qry[0], val[0]))
return 0;
if (!map_word_equal(map, qry[1], val[1]))
return 0;
if (!map_word_equal(map, qry[2], val[2]))
return 0;
return 1; /* "QRY" found */
}
EXPORT_SYMBOL_GPL(cfi_qry_present);
int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
struct cfi_private *cfi)
{
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
if (cfi_qry_present(map, base, cfi))
return 1;
/* QRY not found probably we deal with some odd CFI chips */
/* Some revisions of some old Intel chips? */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
if (cfi_qry_present(map, base, cfi))
return 1;
/* ST M29DW chips */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
if (cfi_qry_present(map, base, cfi))
return 1;
/* some old SST chips, e.g. 39VF160x/39VF320x */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
if (cfi_qry_present(map, base, cfi))
return 1;
/* QRY not found */
return 0;
}
EXPORT_SYMBOL_GPL(cfi_qry_mode_on);
void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map,
struct cfi_private *cfi)
{
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
/* M29W128G flashes require an additional reset command
when exit qry mode */
if ((cfi->mfr == CFI_MFR_ST) && (cfi->id == 0x227E || cfi->id == 0x7E))
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
}
EXPORT_SYMBOL_GPL(cfi_qry_mode_off);
struct cfi_extquery *
__xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
{
struct cfi_private *cfi = map->fldrv_priv;
__u32 base = 0; // cfi->chips[0].start;
int ofs_factor = cfi->interleave * cfi->device_type;
int i;
struct cfi_extquery *extp = NULL;
if (!adr)
goto out;
printk(KERN_INFO "%s Extended Query Table at 0x%4.4X\n", name, adr);
extp = kmalloc(size, GFP_KERNEL);
if (!extp) {
printk(KERN_ERR "Failed to allocate memory\n");
goto out;
}
#ifdef CONFIG_MTD_XIP
local_irq_disable();
#endif
/* Switch it into Query Mode */
cfi_qry_mode_on(base, map, cfi);
/* Read in the Extended Query Table */
for (i=0; i<size; i++) {
((unsigned char *)extp)[i] =
cfi_read_query(map, base+((adr+i)*ofs_factor));
}
/* Make sure it returns to read mode */
cfi_qry_mode_off(base, map, cfi);
#ifdef CONFIG_MTD_XIP
(void) map_read(map, base);
xip_iprefetch();
local_irq_enable();
#endif
out: return extp;
}
EXPORT_SYMBOL(cfi_read_pri);
void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_fixup *f;
for (f=fixups; f->fixup; f++) {
if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
f->fixup(mtd, f->param);
}
}
}
EXPORT_SYMBOL(cfi_fixup);
int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
loff_t ofs, size_t len, void *thunk)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
unsigned long adr;
int chipnum, ret = 0;
int i, first;
struct mtd_erase_region_info *regions = mtd->eraseregions;
if (ofs > mtd->size)
return -EINVAL;
if ((len + ofs) > mtd->size)
return -EINVAL;
/* Check that both start and end of the requested erase are
* aligned with the erasesize at the appropriate addresses.
*/
i = 0;
/* Skip all erase regions which are ended before the start of
the requested erase. Actually, to save on the calculations,
we skip to the first erase region which starts after the
start of the requested erase, and then go back one.
*/
while (i < mtd->numeraseregions && ofs >= regions[i].offset)
i++;
i--;
/* OK, now i is pointing at the erase region in which this
erase request starts. Check the start of the requested
erase range is aligned with the erase size which is in
effect here.
*/
if (ofs & (regions[i].erasesize-1))
return -EINVAL;
/* Remember the erase region we start on */
first = i;
/* Next, check that the end of the requested erase is aligned
* with the erase region at that address.
*/
while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset)
i++;
/* As before, drop back one to point at the region in which
the address actually falls
*/
i--;
if ((ofs + len) & (regions[i].erasesize-1))
return -EINVAL;
chipnum = ofs >> cfi->chipshift;
adr = ofs - (chipnum << cfi->chipshift);
i=first;
while(len) {
int size = regions[i].erasesize;
ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk);
if (ret)
return ret;
adr += size;
ofs += size;
len -= size;
if (ofs == regions[i].offset + size * regions[i].numblocks)
i++;
if (adr >> cfi->chipshift) {
adr = 0;
chipnum++;
if (chipnum >= cfi->numchips)
break;
}
}
return 0;
}
EXPORT_SYMBOL(cfi_varsize_frob);
MODULE_LICENSE("GPL");
|
