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1/*
2 * Routines common to all CFI-type probes.
3 * (C) 2001-2003 Red Hat, Inc.
4 * GPL'd
5 */
6
7#include <linux/kernel.h>
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/mtd/mtd.h>
11#include <linux/mtd/map.h>
12#include <linux/mtd/cfi.h>
13#include <linux/mtd/gen_probe.h>
14
15static struct mtd_info *check_cmd_set(struct map_info *, int);
16static struct cfi_private *genprobe_ident_chips(struct map_info *map,
17 struct chip_probe *cp);
18static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
19 struct cfi_private *cfi);
20
21struct mtd_info *mtd_do_chip_probe(struct map_info *map, struct chip_probe *cp)
22{
23 struct mtd_info *mtd;
24 struct cfi_private *cfi;
25
26 /* First probe the map to see if we have CFI stuff there. */
27 cfi = genprobe_ident_chips(map, cp);
28
29 if (!cfi)
30 return NULL;
31
32 map->fldrv_priv = cfi;
33 /* OK we liked it. Now find a driver for the command set it talks */
34
35 mtd = check_cmd_set(map, 1); /* First the primary cmdset */
36 if (!mtd)
37 mtd = check_cmd_set(map, 0); /* Then the secondary */
38
39 if (mtd) {
40 if (mtd->size > map->size) {
41 printk(KERN_WARNING "Reducing visibility of %ldKiB chip to %ldKiB\n",
42 (unsigned long)mtd->size >> 10,
43 (unsigned long)map->size >> 10);
44 mtd->size = map->size;
45 }
46 return mtd;
47 }
48
49 printk(KERN_WARNING"gen_probe: No supported Vendor Command Set found\n");
50
51 kfree(cfi->cfiq);
52 kfree(cfi);
53 map->fldrv_priv = NULL;
54 return NULL;
55}
56EXPORT_SYMBOL(mtd_do_chip_probe);
57
58
59static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chip_probe *cp)
60{
61 struct cfi_private cfi;
62 struct cfi_private *retcfi;
63 unsigned long *chip_map;
64 int i, j, mapsize;
65 int max_chips;
66
67 memset(&cfi, 0, sizeof(cfi));
68
69 /* Call the probetype-specific code with all permutations of
70 interleave and device type, etc. */
71 if (!genprobe_new_chip(map, cp, &cfi)) {
72 /* The probe didn't like it */
73 pr_debug("%s: Found no %s device at location zero\n",
74 cp->name, map->name);
75 return NULL;
76 }
77
78#if 0 /* Let the CFI probe routine do this sanity check. The Intel and AMD
79 probe routines won't ever return a broken CFI structure anyway,
80 because they make them up themselves.
81 */
82 if (cfi.cfiq->NumEraseRegions == 0) {
83 printk(KERN_WARNING "Number of erase regions is zero\n");
84 kfree(cfi.cfiq);
85 return NULL;
86 }
87#endif
88 cfi.chipshift = cfi.cfiq->DevSize;
89
90 if (cfi_interleave_is_1(&cfi)) {
91 ;
92 } else if (cfi_interleave_is_2(&cfi)) {
93 cfi.chipshift++;
94 } else if (cfi_interleave_is_4((&cfi))) {
95 cfi.chipshift += 2;
96 } else if (cfi_interleave_is_8(&cfi)) {
97 cfi.chipshift += 3;
98 } else {
99 BUG();
100 }
101
102 cfi.numchips = 1;
103
104 /*
105 * Allocate memory for bitmap of valid chips.
106 * Align bitmap storage size to full byte.
107 */
108 max_chips = map->size >> cfi.chipshift;
109 if (!max_chips) {
110 printk(KERN_WARNING "NOR chip too large to fit in mapping. Attempting to cope...\n");
111 max_chips = 1;
112 }
113
114 mapsize = sizeof(long) * DIV_ROUND_UP(max_chips, BITS_PER_LONG);
115 chip_map = kzalloc(mapsize, GFP_KERNEL);
116 if (!chip_map) {
117 kfree(cfi.cfiq);
118 return NULL;
119 }
120
121 set_bit(0, chip_map); /* Mark first chip valid */
122
123 /*
124 * Now probe for other chips, checking sensibly for aliases while
125 * we're at it. The new_chip probe above should have let the first
126 * chip in read mode.
127 */
128
129 for (i = 1; i < max_chips; i++) {
130 cp->probe_chip(map, i << cfi.chipshift, chip_map, &cfi);
131 }
132
133 /*
134 * Now allocate the space for the structures we need to return to
135 * our caller, and copy the appropriate data into them.
136 */
137
138 retcfi = kmalloc(struct_size(retcfi, chips, cfi.numchips), GFP_KERNEL);
139
140 if (!retcfi) {
141 kfree(cfi.cfiq);
142 kfree(chip_map);
143 return NULL;
144 }
145
146 memcpy(retcfi, &cfi, sizeof(cfi));
147 memset(&retcfi->chips[0], 0, sizeof(struct flchip) * cfi.numchips);
148
149 for (i = 0, j = 0; (j < cfi.numchips) && (i < max_chips); i++) {
150 if(test_bit(i, chip_map)) {
151 struct flchip *pchip = &retcfi->chips[j++];
152
153 pchip->start = (i << cfi.chipshift);
154 pchip->state = FL_READY;
155 init_waitqueue_head(&pchip->wq);
156 mutex_init(&pchip->mutex);
157 }
158 }
159
160 kfree(chip_map);
161 return retcfi;
162}
163
164
165static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
166 struct cfi_private *cfi)
167{
168 int min_chips = (map_bankwidth(map)/4?:1); /* At most 4-bytes wide. */
169 int max_chips = map_bankwidth(map); /* And minimum 1 */
170 int nr_chips, type;
171
172 for (nr_chips = max_chips; nr_chips >= min_chips; nr_chips >>= 1) {
173
174 if (!cfi_interleave_supported(nr_chips))
175 continue;
176
177 cfi->interleave = nr_chips;
178
179 /* Minimum device size. Don't look for one 8-bit device
180 in a 16-bit bus, etc. */
181 type = map_bankwidth(map) / nr_chips;
182
183 for (; type <= CFI_DEVICETYPE_X32; type<<=1) {
184 cfi->device_type = type;
185
186 if (cp->probe_chip(map, 0, NULL, cfi))
187 return 1;
188 }
189 }
190 return 0;
191}
192
193typedef struct mtd_info *cfi_cmdset_fn_t(struct map_info *, int);
194
195extern cfi_cmdset_fn_t cfi_cmdset_0001;
196extern cfi_cmdset_fn_t cfi_cmdset_0002;
197extern cfi_cmdset_fn_t cfi_cmdset_0020;
198
199static inline struct mtd_info *cfi_cmdset_unknown(struct map_info *map,
200 int primary)
201{
202 struct cfi_private *cfi = map->fldrv_priv;
203 __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
204#ifdef CONFIG_MODULES
205 cfi_cmdset_fn_t *probe_function;
206 char *probename;
207
208 probename = kasprintf(GFP_KERNEL, "cfi_cmdset_%4.4X", type);
209 if (!probename)
210 return NULL;
211
212 probe_function = __symbol_get(probename);
213 if (!probe_function) {
214 request_module("cfi_cmdset_%4.4X", type);
215 probe_function = __symbol_get(probename);
216 }
217 kfree(probename);
218
219 if (probe_function) {
220 struct mtd_info *mtd;
221
222 mtd = (*probe_function)(map, primary);
223 /* If it was happy, it'll have increased its own use count */
224 symbol_put_addr(probe_function);
225 return mtd;
226 }
227#endif
228 printk(KERN_NOTICE "Support for command set %04X not present\n", type);
229
230 return NULL;
231}
232
233static struct mtd_info *check_cmd_set(struct map_info *map, int primary)
234{
235 struct cfi_private *cfi = map->fldrv_priv;
236 __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
237
238 if (type == P_ID_NONE || type == P_ID_RESERVED)
239 return NULL;
240
241 switch(type){
242 /* We need these for the !CONFIG_MODULES case,
243 because symbol_get() doesn't work there */
244#ifdef CONFIG_MTD_CFI_INTELEXT
245 case P_ID_INTEL_EXT:
246 case P_ID_INTEL_STD:
247 case P_ID_INTEL_PERFORMANCE:
248 return cfi_cmdset_0001(map, primary);
249#endif
250#ifdef CONFIG_MTD_CFI_AMDSTD
251 case P_ID_AMD_STD:
252 case P_ID_SST_OLD:
253 case P_ID_WINBOND:
254 return cfi_cmdset_0002(map, primary);
255#endif
256#ifdef CONFIG_MTD_CFI_STAA
257 case P_ID_ST_ADV:
258 return cfi_cmdset_0020(map, primary);
259#endif
260 default:
261 return cfi_cmdset_unknown(map, primary);
262 }
263}
264
265MODULE_LICENSE("GPL");
266MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
267MODULE_DESCRIPTION("Helper routines for flash chip probe code");