acpi_pad: build only on X86
[linux-2.6/linux-acpi-2.6.git] / drivers / mtd / chips / gen_probe.c
blobe2dc96441e05e0a6affa6c5fa2611fef0f545d9e
1 /*
2 * Routines common to all CFI-type probes.
3 * (C) 2001-2003 Red Hat, Inc.
4 * GPL'd
5 */
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>
15 static struct mtd_info *check_cmd_set(struct map_info *, int);
16 static struct cfi_private *genprobe_ident_chips(struct map_info *map,
17 struct chip_probe *cp);
18 static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
19 struct cfi_private *cfi);
21 struct mtd_info *mtd_do_chip_probe(struct map_info *map, struct chip_probe *cp)
23 struct mtd_info *mtd = NULL;
24 struct cfi_private *cfi;
26 /* First probe the map to see if we have CFI stuff there. */
27 cfi = genprobe_ident_chips(map, cp);
29 if (!cfi)
30 return NULL;
32 map->fldrv_priv = cfi;
33 /* OK we liked it. Now find a driver for the command set it talks */
35 mtd = check_cmd_set(map, 1); /* First the primary cmdset */
36 if (!mtd)
37 mtd = check_cmd_set(map, 0); /* Then the secondary */
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;
46 return mtd;
49 printk(KERN_WARNING"gen_probe: No supported Vendor Command Set found\n");
51 kfree(cfi->cfiq);
52 kfree(cfi);
53 map->fldrv_priv = NULL;
54 return NULL;
56 EXPORT_SYMBOL(mtd_do_chip_probe);
59 static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chip_probe *cp)
61 struct cfi_private cfi;
62 struct cfi_private *retcfi;
63 unsigned long *chip_map;
64 int i, j, mapsize;
65 int max_chips;
67 memset(&cfi, 0, sizeof(cfi));
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;
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.
82 if (cfi.cfiq->NumEraseRegions == 0) {
83 printk(KERN_WARNING "Number of erase regions is zero\n");
84 kfree(cfi.cfiq);
85 return NULL;
87 #endif
88 cfi.chipshift = cfi.cfiq->DevSize;
90 if (cfi_interleave_is_1(&cfi)) {
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();
102 cfi.numchips = 1;
105 * Allocate memory for bitmap of valid chips.
106 * Align bitmap storage size to full byte.
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;
114 mapsize = sizeof(long) * DIV_ROUND_UP(max_chips, BITS_PER_LONG);
115 chip_map = kzalloc(mapsize, GFP_KERNEL);
116 if (!chip_map) {
117 printk(KERN_WARNING "%s: kmalloc failed for CFI chip map\n", map->name);
118 kfree(cfi.cfiq);
119 return NULL;
122 set_bit(0, chip_map); /* Mark first chip valid */
125 * Now probe for other chips, checking sensibly for aliases while
126 * we're at it. The new_chip probe above should have let the first
127 * chip in read mode.
130 for (i = 1; i < max_chips; i++) {
131 cp->probe_chip(map, i << cfi.chipshift, chip_map, &cfi);
135 * Now allocate the space for the structures we need to return to
136 * our caller, and copy the appropriate data into them.
139 retcfi = kmalloc(sizeof(struct cfi_private) + cfi.numchips * sizeof(struct flchip), GFP_KERNEL);
141 if (!retcfi) {
142 printk(KERN_WARNING "%s: kmalloc failed for CFI private structure\n", map->name);
143 kfree(cfi.cfiq);
144 kfree(chip_map);
145 return NULL;
148 memcpy(retcfi, &cfi, sizeof(cfi));
149 memset(&retcfi->chips[0], 0, sizeof(struct flchip) * cfi.numchips);
151 for (i = 0, j = 0; (j < cfi.numchips) && (i < max_chips); i++) {
152 if(test_bit(i, chip_map)) {
153 struct flchip *pchip = &retcfi->chips[j++];
155 pchip->start = (i << cfi.chipshift);
156 pchip->state = FL_READY;
157 init_waitqueue_head(&pchip->wq);
158 spin_lock_init(&pchip->_spinlock);
159 pchip->mutex = &pchip->_spinlock;
163 kfree(chip_map);
164 return retcfi;
168 static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
169 struct cfi_private *cfi)
171 int min_chips = (map_bankwidth(map)/4?:1); /* At most 4-bytes wide. */
172 int max_chips = map_bankwidth(map); /* And minimum 1 */
173 int nr_chips, type;
175 for (nr_chips = max_chips; nr_chips >= min_chips; nr_chips >>= 1) {
177 if (!cfi_interleave_supported(nr_chips))
178 continue;
180 cfi->interleave = nr_chips;
182 /* Minimum device size. Don't look for one 8-bit device
183 in a 16-bit bus, etc. */
184 type = map_bankwidth(map) / nr_chips;
186 for (; type <= CFI_DEVICETYPE_X32; type<<=1) {
187 cfi->device_type = type;
189 if (cp->probe_chip(map, 0, NULL, cfi))
190 return 1;
193 return 0;
196 typedef struct mtd_info *cfi_cmdset_fn_t(struct map_info *, int);
198 extern cfi_cmdset_fn_t cfi_cmdset_0001;
199 extern cfi_cmdset_fn_t cfi_cmdset_0002;
200 extern cfi_cmdset_fn_t cfi_cmdset_0020;
202 static inline struct mtd_info *cfi_cmdset_unknown(struct map_info *map,
203 int primary)
205 struct cfi_private *cfi = map->fldrv_priv;
206 __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
207 #ifdef CONFIG_MODULES
208 char probename[16+sizeof(MODULE_SYMBOL_PREFIX)];
209 cfi_cmdset_fn_t *probe_function;
211 sprintf(probename, MODULE_SYMBOL_PREFIX "cfi_cmdset_%4.4X", type);
213 probe_function = __symbol_get(probename);
214 if (!probe_function) {
215 request_module(probename + sizeof(MODULE_SYMBOL_PREFIX) - 1);
216 probe_function = __symbol_get(probename);
219 if (probe_function) {
220 struct mtd_info *mtd;
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;
227 #endif
228 printk(KERN_NOTICE "Support for command set %04X not present\n", type);
230 return NULL;
233 static struct mtd_info *check_cmd_set(struct map_info *map, int primary)
235 struct cfi_private *cfi = map->fldrv_priv;
236 __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
238 if (type == P_ID_NONE || type == P_ID_RESERVED)
239 return NULL;
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 0x0001:
246 case 0x0003:
247 case 0x0200:
248 return cfi_cmdset_0001(map, primary);
249 #endif
250 #ifdef CONFIG_MTD_CFI_AMDSTD
251 case 0x0002:
252 return cfi_cmdset_0002(map, primary);
253 #endif
254 #ifdef CONFIG_MTD_CFI_STAA
255 case 0x0020:
256 return cfi_cmdset_0020(map, primary);
257 #endif
258 default:
259 return cfi_cmdset_unknown(map, primary);
263 MODULE_LICENSE("GPL");
264 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
265 MODULE_DESCRIPTION("Helper routines for flash chip probe code");