Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common Flash Interface support: |
| 3 | * Generic utility functions not dependant 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 | * |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 10 | * $Id: cfi_util.c,v 1.10 2005/11/07 11:14:23 gleixner Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <asm/io.h> |
| 19 | #include <asm/byteorder.h> |
| 20 | |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/mtd/xip.h> |
| 26 | #include <linux/mtd/mtd.h> |
| 27 | #include <linux/mtd/map.h> |
| 28 | #include <linux/mtd/cfi.h> |
| 29 | #include <linux/mtd/compatmac.h> |
| 30 | |
| 31 | struct cfi_extquery * |
| 32 | __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name) |
| 33 | { |
| 34 | struct cfi_private *cfi = map->fldrv_priv; |
| 35 | __u32 base = 0; // cfi->chips[0].start; |
| 36 | int ofs_factor = cfi->interleave * cfi->device_type; |
| 37 | int i; |
| 38 | struct cfi_extquery *extp = NULL; |
| 39 | |
| 40 | printk(" %s Extended Query Table at 0x%4.4X\n", name, adr); |
| 41 | if (!adr) |
| 42 | goto out; |
| 43 | |
| 44 | extp = kmalloc(size, GFP_KERNEL); |
| 45 | if (!extp) { |
| 46 | printk(KERN_ERR "Failed to allocate memory\n"); |
| 47 | goto out; |
| 48 | } |
| 49 | |
| 50 | #ifdef CONFIG_MTD_XIP |
| 51 | local_irq_disable(); |
| 52 | #endif |
| 53 | |
| 54 | /* Switch it into Query Mode */ |
| 55 | cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); |
| 56 | |
| 57 | /* Read in the Extended Query Table */ |
| 58 | for (i=0; i<size; i++) { |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 59 | ((unsigned char *)extp)[i] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | cfi_read_query(map, base+((adr+i)*ofs_factor)); |
| 61 | } |
| 62 | |
| 63 | /* Make sure it returns to read mode */ |
| 64 | cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL); |
| 65 | cfi_send_gen_cmd(0xff, 0, base, map, cfi, cfi->device_type, NULL); |
| 66 | |
| 67 | #ifdef CONFIG_MTD_XIP |
| 68 | (void) map_read(map, base); |
| 69 | asm volatile (".rep 8; nop; .endr"); |
| 70 | local_irq_enable(); |
| 71 | #endif |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | out: return extp; |
| 74 | } |
| 75 | |
| 76 | EXPORT_SYMBOL(cfi_read_pri); |
| 77 | |
| 78 | void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups) |
| 79 | { |
| 80 | struct map_info *map = mtd->priv; |
| 81 | struct cfi_private *cfi = map->fldrv_priv; |
| 82 | struct cfi_fixup *f; |
| 83 | |
| 84 | for (f=fixups; f->fixup; f++) { |
| 85 | if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) && |
| 86 | ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) { |
| 87 | f->fixup(mtd, f->param); |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | EXPORT_SYMBOL(cfi_fixup); |
| 93 | |
| 94 | int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob, |
| 95 | loff_t ofs, size_t len, void *thunk) |
| 96 | { |
| 97 | struct map_info *map = mtd->priv; |
| 98 | struct cfi_private *cfi = map->fldrv_priv; |
| 99 | unsigned long adr; |
| 100 | int chipnum, ret = 0; |
| 101 | int i, first; |
| 102 | struct mtd_erase_region_info *regions = mtd->eraseregions; |
| 103 | |
| 104 | if (ofs > mtd->size) |
| 105 | return -EINVAL; |
| 106 | |
| 107 | if ((len + ofs) > mtd->size) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | /* Check that both start and end of the requested erase are |
| 111 | * aligned with the erasesize at the appropriate addresses. |
| 112 | */ |
| 113 | |
| 114 | i = 0; |
| 115 | |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 116 | /* Skip all erase regions which are ended before the start of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | the requested erase. Actually, to save on the calculations, |
| 118 | we skip to the first erase region which starts after the |
| 119 | start of the requested erase, and then go back one. |
| 120 | */ |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | while (i < mtd->numeraseregions && ofs >= regions[i].offset) |
| 123 | i++; |
| 124 | i--; |
| 125 | |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 126 | /* OK, now i is pointing at the erase region in which this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | erase request starts. Check the start of the requested |
| 128 | erase range is aligned with the erase size which is in |
| 129 | effect here. |
| 130 | */ |
| 131 | |
| 132 | if (ofs & (regions[i].erasesize-1)) |
| 133 | return -EINVAL; |
| 134 | |
| 135 | /* Remember the erase region we start on */ |
| 136 | first = i; |
| 137 | |
| 138 | /* Next, check that the end of the requested erase is aligned |
| 139 | * with the erase region at that address. |
| 140 | */ |
| 141 | |
| 142 | while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset) |
| 143 | i++; |
| 144 | |
| 145 | /* As before, drop back one to point at the region in which |
| 146 | the address actually falls |
| 147 | */ |
| 148 | i--; |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | if ((ofs + len) & (regions[i].erasesize-1)) |
| 151 | return -EINVAL; |
| 152 | |
| 153 | chipnum = ofs >> cfi->chipshift; |
| 154 | adr = ofs - (chipnum << cfi->chipshift); |
| 155 | |
| 156 | i=first; |
| 157 | |
| 158 | while(len) { |
| 159 | int size = regions[i].erasesize; |
| 160 | |
| 161 | ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk); |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | if (ret) |
| 164 | return ret; |
| 165 | |
| 166 | adr += size; |
| 167 | ofs += size; |
| 168 | len -= size; |
| 169 | |
| 170 | if (ofs == regions[i].offset + size * regions[i].numblocks) |
| 171 | i++; |
| 172 | |
| 173 | if (adr >> cfi->chipshift) { |
| 174 | adr = 0; |
| 175 | chipnum++; |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | if (chipnum >= cfi->numchips) |
| 178 | break; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | EXPORT_SYMBOL(cfi_varsize_frob); |
| 186 | |
| 187 | MODULE_LICENSE("GPL"); |