1 /*
2 * Common Flash Interface support:
3 * Generic utility functions not dependent on command set
4 *
5 * Copyright (C) 2002 Red Hat
6 * Copyright (C) 2003 STMicroelectronics Limited
7 *
8 * This code is covered by the GPL.
9 */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <asm/io.h>
15 #include <asm/byteorder.h>
16
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/interrupt.h>
21 #include <linux/mtd/xip.h>
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/map.h>
24 #include <linux/mtd/cfi.h>
25
cfi_qry_present(struct map_info * map,__u32 base,struct cfi_private * cfi)26 int __xipram cfi_qry_present(struct map_info *map, __u32 base,
27 struct cfi_private *cfi)
28 {
29 int osf = cfi->interleave * cfi->device_type; /* scale factor */
30 map_word val[3];
31 map_word qry[3];
32
33 qry[0] = cfi_build_cmd('Q', map, cfi);
34 qry[1] = cfi_build_cmd('R', map, cfi);
35 qry[2] = cfi_build_cmd('Y', map, cfi);
36
37 val[0] = map_read(map, base + osf*0x10);
38 val[1] = map_read(map, base + osf*0x11);
39 val[2] = map_read(map, base + osf*0x12);
40
41 if (!map_word_equal(map, qry[0], val[0]))
42 return 0;
43
44 if (!map_word_equal(map, qry[1], val[1]))
45 return 0;
46
47 if (!map_word_equal(map, qry[2], val[2]))
48 return 0;
49
50 return 1; /* "QRY" found */
51 }
52 EXPORT_SYMBOL_GPL(cfi_qry_present);
53
cfi_qry_mode_on(uint32_t base,struct map_info * map,struct cfi_private * cfi)54 int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
55 struct cfi_private *cfi)
56 {
57 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
58 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
59 if (cfi_qry_present(map, base, cfi))
60 return 1;
61 /* QRY not found probably we deal with some odd CFI chips */
62 /* Some revisions of some old Intel chips? */
63 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
64 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
65 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
66 if (cfi_qry_present(map, base, cfi))
67 return 1;
68 /* ST M29DW chips */
69 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
70 cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
71 if (cfi_qry_present(map, base, cfi))
72 return 1;
73 /* some old SST chips, e.g. 39VF160x/39VF320x */
74 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
75 cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
76 cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
77 cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
78 if (cfi_qry_present(map, base, cfi))
79 return 1;
80 /* SST 39VF640xB */
81 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
82 cfi_send_gen_cmd(0xAA, 0x555, base, map, cfi, cfi->device_type, NULL);
83 cfi_send_gen_cmd(0x55, 0x2AA, base, map, cfi, cfi->device_type, NULL);
84 cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
85 if (cfi_qry_present(map, base, cfi))
86 return 1;
87 /* QRY not found */
88 return 0;
89 }
90 EXPORT_SYMBOL_GPL(cfi_qry_mode_on);
91
cfi_qry_mode_off(uint32_t base,struct map_info * map,struct cfi_private * cfi)92 void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map,
93 struct cfi_private *cfi)
94 {
95 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
96 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
97 /* M29W128G flashes require an additional reset command
98 when exit qry mode */
99 if ((cfi->mfr == CFI_MFR_ST) && (cfi->id == 0x227E || cfi->id == 0x7E))
100 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
101 }
102 EXPORT_SYMBOL_GPL(cfi_qry_mode_off);
103
104 struct cfi_extquery *
cfi_read_pri(struct map_info * map,__u16 adr,__u16 size,const char * name)105 __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
106 {
107 struct cfi_private *cfi = map->fldrv_priv;
108 __u32 base = 0; // cfi->chips[0].start;
109 int ofs_factor = cfi->interleave * cfi->device_type;
110 int i;
111 struct cfi_extquery *extp = NULL;
112
113 if (!adr)
114 goto out;
115
116 printk(KERN_INFO "%s Extended Query Table at 0x%4.4X\n", name, adr);
117
118 extp = kmalloc(size, GFP_KERNEL);
119 if (!extp) {
120 printk(KERN_ERR "Failed to allocate memory\n");
121 goto out;
122 }
123
124 #ifdef CONFIG_MTD_XIP
125 local_irq_disable();
126 #endif
127
128 /* Switch it into Query Mode */
129 cfi_qry_mode_on(base, map, cfi);
130 /* Read in the Extended Query Table */
131 for (i=0; i<size; i++) {
132 ((unsigned char *)extp)[i] =
133 cfi_read_query(map, base+((adr+i)*ofs_factor));
134 }
135
136 /* Make sure it returns to read mode */
137 cfi_qry_mode_off(base, map, cfi);
138
139 #ifdef CONFIG_MTD_XIP
140 (void) map_read(map, base);
141 xip_iprefetch();
142 local_irq_enable();
143 #endif
144
145 out: return extp;
146 }
147
148 EXPORT_SYMBOL(cfi_read_pri);
149
cfi_fixup(struct mtd_info * mtd,struct cfi_fixup * fixups)150 void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups)
151 {
152 struct map_info *map = mtd->priv;
153 struct cfi_private *cfi = map->fldrv_priv;
154 struct cfi_fixup *f;
155
156 for (f=fixups; f->fixup; f++) {
157 if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
158 ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
159 f->fixup(mtd);
160 }
161 }
162 }
163
164 EXPORT_SYMBOL(cfi_fixup);
165
cfi_varsize_frob(struct mtd_info * mtd,varsize_frob_t frob,loff_t ofs,size_t len,void * thunk)166 int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
167 loff_t ofs, size_t len, void *thunk)
168 {
169 struct map_info *map = mtd->priv;
170 struct cfi_private *cfi = map->fldrv_priv;
171 unsigned long adr;
172 int chipnum, ret = 0;
173 int i, first;
174 struct mtd_erase_region_info *regions = mtd->eraseregions;
175
176 /* Check that both start and end of the requested erase are
177 * aligned with the erasesize at the appropriate addresses.
178 */
179
180 i = 0;
181
182 /* Skip all erase regions which are ended before the start of
183 the requested erase. Actually, to save on the calculations,
184 we skip to the first erase region which starts after the
185 start of the requested erase, and then go back one.
186 */
187
188 while (i < mtd->numeraseregions && ofs >= regions[i].offset)
189 i++;
190 i--;
191
192 /* OK, now i is pointing at the erase region in which this
193 erase request starts. Check the start of the requested
194 erase range is aligned with the erase size which is in
195 effect here.
196 */
197
198 if (ofs & (regions[i].erasesize-1))
199 return -EINVAL;
200
201 /* Remember the erase region we start on */
202 first = i;
203
204 /* Next, check that the end of the requested erase is aligned
205 * with the erase region at that address.
206 */
207
208 while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset)
209 i++;
210
211 /* As before, drop back one to point at the region in which
212 the address actually falls
213 */
214 i--;
215
216 if ((ofs + len) & (regions[i].erasesize-1))
217 return -EINVAL;
218
219 chipnum = ofs >> cfi->chipshift;
220 adr = ofs - (chipnum << cfi->chipshift);
221
222 i=first;
223
224 while(len) {
225 int size = regions[i].erasesize;
226
227 ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk);
228
229 if (ret)
230 return ret;
231
232 adr += size;
233 ofs += size;
234 len -= size;
235
236 if (ofs == regions[i].offset + size * regions[i].numblocks)
237 i++;
238
239 if (adr >> cfi->chipshift) {
240 adr = 0;
241 chipnum++;
242
243 if (chipnum >= cfi->numchips)
244 break;
245 }
246 }
247
248 return 0;
249 }
250
251 EXPORT_SYMBOL(cfi_varsize_frob);
252
253 MODULE_LICENSE("GPL");
254