2 * Common Flash Interface support:
3 * Generic utility functions not dependant on command set
5 * Copyright (C) 2002 Red Hat
6 * Copyright (C) 2003 STMicroelectronics Limited
8 * This code is covered by the GPL.
10 * $Id: cfi_util.c,v 1.10 2005/11/07 11:14:23 gleixner Exp $
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
18 #include <asm/byteorder.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/delay.h>
23 #include <linux/interrupt.h>
24 #include <linux/mtd/xip.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/map.h>
27 #include <linux/mtd/cfi.h>
28 #include <linux/mtd/compatmac.h>
31 __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
33 struct cfi_private *cfi = map->fldrv_priv;
34 __u32 base = 0; // cfi->chips[0].start;
35 int ofs_factor = cfi->interleave * cfi->device_type;
37 struct cfi_extquery *extp = NULL;
39 printk(" %s Extended Query Table at 0x%4.4X\n", name, adr);
43 extp = kmalloc(size, GFP_KERNEL);
45 printk(KERN_ERR "Failed to allocate memory\n");
53 /* Switch it into Query Mode */
54 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
56 /* Read in the Extended Query Table */
57 for (i=0; i<size; i++) {
58 ((unsigned char *)extp)[i] =
59 cfi_read_query(map, base+((adr+i)*ofs_factor));
62 /* Make sure it returns to read mode */
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);
67 (void) map_read(map, base);
68 asm volatile (".rep 8; nop; .endr");
75 EXPORT_SYMBOL(cfi_read_pri);
77 void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups)
79 struct map_info *map = mtd->priv;
80 struct cfi_private *cfi = map->fldrv_priv;
83 for (f=fixups; f->fixup; f++) {
84 if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
85 ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
86 f->fixup(mtd, f->param);
91 EXPORT_SYMBOL(cfi_fixup);
93 int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
94 loff_t ofs, size_t len, void *thunk)
96 struct map_info *map = mtd->priv;
97 struct cfi_private *cfi = map->fldrv_priv;
101 struct mtd_erase_region_info *regions = mtd->eraseregions;
106 if ((len + ofs) > mtd->size)
109 /* Check that both start and end of the requested erase are
110 * aligned with the erasesize at the appropriate addresses.
115 /* Skip all erase regions which are ended before the start of
116 the requested erase. Actually, to save on the calculations,
117 we skip to the first erase region which starts after the
118 start of the requested erase, and then go back one.
121 while (i < mtd->numeraseregions && ofs >= regions[i].offset)
125 /* OK, now i is pointing at the erase region in which this
126 erase request starts. Check the start of the requested
127 erase range is aligned with the erase size which is in
131 if (ofs & (regions[i].erasesize-1))
134 /* Remember the erase region we start on */
137 /* Next, check that the end of the requested erase is aligned
138 * with the erase region at that address.
141 while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset)
144 /* As before, drop back one to point at the region in which
145 the address actually falls
149 if ((ofs + len) & (regions[i].erasesize-1))
152 chipnum = ofs >> cfi->chipshift;
153 adr = ofs - (chipnum << cfi->chipshift);
158 int size = regions[i].erasesize;
160 ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk);
169 if (ofs == regions[i].offset + size * regions[i].numblocks)
172 if (adr >> cfi->chipshift) {
176 if (chipnum >= cfi->numchips)
184 EXPORT_SYMBOL(cfi_varsize_frob);
186 MODULE_LICENSE("GPL");