nand_bbt.c revision 1.1.2.2
1 1.1.2.2 bouyer /* $NetBSD: nand_bbt.c,v 1.1.2.2 2011/03/05 15:10:22 bouyer Exp $ */ 2 1.1.2.2 bouyer 3 1.1.2.2 bouyer /*- 4 1.1.2.2 bouyer * Copyright (c) 2011 Department of Software Engineering, 5 1.1.2.2 bouyer * University of Szeged, Hungary 6 1.1.2.2 bouyer * Copyright (c) 2011 Adam Hoka <ahoka (at) NetBSD.org> 7 1.1.2.2 bouyer * All rights reserved. 8 1.1.2.2 bouyer * 9 1.1.2.2 bouyer * This code is derived from software contributed to The NetBSD Foundation 10 1.1.2.2 bouyer * by the Department of Software Engineering, University of Szeged, Hungary 11 1.1.2.2 bouyer * 12 1.1.2.2 bouyer * Redistribution and use in source and binary forms, with or without 13 1.1.2.2 bouyer * modification, are permitted provided that the following conditions 14 1.1.2.2 bouyer * are met: 15 1.1.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 16 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer. 17 1.1.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 18 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 19 1.1.2.2 bouyer * documentation and/or other materials provided with the distribution. 20 1.1.2.2 bouyer * 21 1.1.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 1.1.2.2 bouyer * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 1.1.2.2 bouyer * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 1.1.2.2 bouyer * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 1.1.2.2 bouyer * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 1.1.2.2 bouyer * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 1.1.2.2 bouyer * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 1.1.2.2 bouyer * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 1.1.2.2 bouyer * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.1.2.2 bouyer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.1.2.2 bouyer * SUCH DAMAGE. 32 1.1.2.2 bouyer */ 33 1.1.2.2 bouyer 34 1.1.2.2 bouyer /* Support for Bad Block Tables (BBTs) */ 35 1.1.2.2 bouyer 36 1.1.2.2 bouyer #include <sys/param.h> 37 1.1.2.2 bouyer #include <sys/kmem.h> 38 1.1.2.2 bouyer 39 1.1.2.2 bouyer #include "nand.h" 40 1.1.2.2 bouyer #include "nand_bbt.h" 41 1.1.2.2 bouyer 42 1.1.2.2 bouyer void 43 1.1.2.2 bouyer nand_bbt_init(device_t self) 44 1.1.2.2 bouyer { 45 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 46 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 47 1.1.2.2 bouyer struct nand_bbt *bbt = &sc->sc_bbt; 48 1.1.2.2 bouyer 49 1.1.2.2 bouyer bbt->nbbt_size = chip->nc_size / chip->nc_block_size / 4; 50 1.1.2.2 bouyer bbt->nbbt_bitmap = kmem_alloc(bbt->nbbt_size, KM_SLEEP); 51 1.1.2.2 bouyer 52 1.1.2.2 bouyer memset(bbt->nbbt_bitmap, 0xff, bbt->nbbt_size); 53 1.1.2.2 bouyer } 54 1.1.2.2 bouyer 55 1.1.2.2 bouyer void 56 1.1.2.2 bouyer nand_bbt_detach(device_t self) 57 1.1.2.2 bouyer { 58 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 59 1.1.2.2 bouyer struct nand_bbt *bbt = &sc->sc_bbt; 60 1.1.2.2 bouyer 61 1.1.2.2 bouyer printf("freeing bbt bitmap..."); 62 1.1.2.2 bouyer kmem_free(bbt->nbbt_bitmap, bbt->nbbt_size); 63 1.1.2.2 bouyer printf("done!\n"); 64 1.1.2.2 bouyer } 65 1.1.2.2 bouyer 66 1.1.2.2 bouyer void 67 1.1.2.2 bouyer nand_bbt_scan(device_t self) 68 1.1.2.2 bouyer { 69 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 70 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 71 1.1.2.2 bouyer flash_addr_t i, blocks, addr; 72 1.1.2.2 bouyer 73 1.1.2.2 bouyer blocks = chip->nc_size / chip->nc_block_size; 74 1.1.2.2 bouyer 75 1.1.2.2 bouyer aprint_normal_dev(self, "scanning for bad blocks\n"); 76 1.1.2.2 bouyer 77 1.1.2.2 bouyer addr = 0; 78 1.1.2.2 bouyer for (i = 0; i < blocks; i++) { 79 1.1.2.2 bouyer if (nand_isfactorybad(self, addr)) { 80 1.1.2.2 bouyer nand_bbt_block_markfactorybad(self, i); 81 1.1.2.2 bouyer } else if (nand_iswornoutbad(self, addr)) { 82 1.1.2.2 bouyer nand_bbt_block_markbad(self, i); 83 1.1.2.2 bouyer } 84 1.1.2.2 bouyer 85 1.1.2.2 bouyer addr += chip->nc_block_size; 86 1.1.2.2 bouyer } 87 1.1.2.2 bouyer } 88 1.1.2.2 bouyer 89 1.1.2.2 bouyer bool 90 1.1.2.2 bouyer nand_bbt_update(device_t self) 91 1.1.2.2 bouyer { 92 1.1.2.2 bouyer return true; 93 1.1.2.2 bouyer } 94 1.1.2.2 bouyer 95 1.1.2.2 bouyer static bool 96 1.1.2.2 bouyer nand_bbt_page_has_bbt(device_t self, flash_addr_t addr) { 97 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 98 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 99 1.1.2.2 bouyer uint8_t *oob = chip->nc_oob_cache; 100 1.1.2.2 bouyer 101 1.1.2.2 bouyer nand_read_oob(self, addr, oob); 102 1.1.2.2 bouyer 103 1.1.2.2 bouyer if (oob[NAND_BBT_OFFSET] == 'B' && 104 1.1.2.2 bouyer oob[NAND_BBT_OFFSET + 1] == 'b' && 105 1.1.2.2 bouyer oob[NAND_BBT_OFFSET + 2] == 't') { 106 1.1.2.2 bouyer return true; 107 1.1.2.2 bouyer } else { 108 1.1.2.2 bouyer return false; 109 1.1.2.2 bouyer } 110 1.1.2.2 bouyer } 111 1.1.2.2 bouyer 112 1.1.2.2 bouyer static bool 113 1.1.2.2 bouyer nand_bbt_get_bbt_from_page(device_t self, flash_addr_t addr) 114 1.1.2.2 bouyer { 115 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 116 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 117 1.1.2.2 bouyer struct nand_bbt *bbt = &sc->sc_bbt; 118 1.1.2.2 bouyer uint8_t *bbtp, *buf = chip->nc_page_cache; 119 1.1.2.2 bouyer size_t left, bbt_pages, i; 120 1.1.2.2 bouyer 121 1.1.2.2 bouyer bbt_pages = bbt->nbbt_size / chip->nc_page_size; 122 1.1.2.2 bouyer if (bbt->nbbt_size % chip->nc_page_size) 123 1.1.2.2 bouyer bbt_pages++; 124 1.1.2.2 bouyer 125 1.1.2.2 bouyer if (nand_isbad(self, addr)) { 126 1.1.2.2 bouyer return false; 127 1.1.2.2 bouyer } 128 1.1.2.2 bouyer 129 1.1.2.2 bouyer if (nand_bbt_page_has_bbt(self, addr)) { 130 1.1.2.2 bouyer bbtp = bbt->nbbt_bitmap; 131 1.1.2.2 bouyer left = bbt->nbbt_size; 132 1.1.2.2 bouyer 133 1.1.2.2 bouyer for (i = 0; i < bbt_pages; i++) { 134 1.1.2.2 bouyer nand_read_page(self, addr, buf); 135 1.1.2.2 bouyer 136 1.1.2.2 bouyer if (i == bbt_pages - 1) { 137 1.1.2.2 bouyer KASSERT(left <= chip->nc_page_size); 138 1.1.2.2 bouyer memcpy(bbtp, buf, left); 139 1.1.2.2 bouyer } else { 140 1.1.2.2 bouyer memcpy(bbtp, buf, chip->nc_page_size); 141 1.1.2.2 bouyer } 142 1.1.2.2 bouyer 143 1.1.2.2 bouyer bbtp += chip->nc_page_size; 144 1.1.2.2 bouyer left -= chip->nc_page_size; 145 1.1.2.2 bouyer addr += chip->nc_page_size; 146 1.1.2.2 bouyer } 147 1.1.2.2 bouyer 148 1.1.2.2 bouyer return true; 149 1.1.2.2 bouyer } else { 150 1.1.2.2 bouyer return false; 151 1.1.2.2 bouyer } 152 1.1.2.2 bouyer } 153 1.1.2.2 bouyer 154 1.1.2.2 bouyer bool 155 1.1.2.2 bouyer nand_bbt_load(device_t self) 156 1.1.2.2 bouyer { 157 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 158 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 159 1.1.2.2 bouyer flash_addr_t blockaddr; 160 1.1.2.2 bouyer int n; 161 1.1.2.2 bouyer 162 1.1.2.2 bouyer blockaddr = chip->nc_size - chip->nc_block_size; 163 1.1.2.2 bouyer /* XXX currently we check the last 4 blocks */ 164 1.1.2.2 bouyer for (n = 0; n < 4; n++) { 165 1.1.2.2 bouyer if (nand_bbt_get_bbt_from_page(self, blockaddr)) { 166 1.1.2.2 bouyer break; 167 1.1.2.2 bouyer } else { 168 1.1.2.2 bouyer blockaddr -= chip->nc_block_size; 169 1.1.2.2 bouyer } 170 1.1.2.2 bouyer } 171 1.1.2.2 bouyer 172 1.1.2.2 bouyer return true; 173 1.1.2.2 bouyer } 174 1.1.2.2 bouyer 175 1.1.2.2 bouyer void 176 1.1.2.2 bouyer nand_bbt_block_markbad(device_t self, flash_addr_t block) 177 1.1.2.2 bouyer { 178 1.1.2.2 bouyer if (nand_bbt_block_isbad(self, block)) { 179 1.1.2.2 bouyer aprint_error_dev(self, 180 1.1.2.2 bouyer "trying to mark block bad already marked in bbt\n"); 181 1.1.2.2 bouyer } 182 1.1.2.2 bouyer /* XXX check if this is the correct marker */ 183 1.1.2.2 bouyer nand_bbt_block_mark(self, block, NAND_BBT_MARKER_WORNOUT_BAD); 184 1.1.2.2 bouyer } 185 1.1.2.2 bouyer 186 1.1.2.2 bouyer void 187 1.1.2.2 bouyer nand_bbt_block_markfactorybad(device_t self, flash_addr_t block) 188 1.1.2.2 bouyer { 189 1.1.2.2 bouyer if (nand_bbt_block_isbad(self, block)) { 190 1.1.2.2 bouyer aprint_error_dev(self, 191 1.1.2.2 bouyer "trying to mark block factory bad already" 192 1.1.2.2 bouyer " marked in bbt\n"); 193 1.1.2.2 bouyer } 194 1.1.2.2 bouyer nand_bbt_block_mark(self, block, NAND_BBT_MARKER_FACTORY_BAD); 195 1.1.2.2 bouyer } 196 1.1.2.2 bouyer 197 1.1.2.2 bouyer void 198 1.1.2.2 bouyer nand_bbt_block_mark(device_t self, flash_addr_t block, uint8_t marker) 199 1.1.2.2 bouyer { 200 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 201 1.1.2.2 bouyer #ifdef DIAGNOSTIC 202 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 203 1.1.2.2 bouyer #endif 204 1.1.2.2 bouyer struct nand_bbt *bbt = &sc->sc_bbt; 205 1.1.2.2 bouyer uint8_t clean; 206 1.1.2.2 bouyer 207 1.1.2.2 bouyer KASSERT(block < chip->nc_size / chip->nc_block_size); 208 1.1.2.2 bouyer 209 1.1.2.2 bouyer clean = (~0x03 << ((block % 4) * 2)); 210 1.1.2.2 bouyer marker = (marker << ((block % 4) * 2)); 211 1.1.2.2 bouyer 212 1.1.2.2 bouyer /* set byte containing the 2 bit marker for this block */ 213 1.1.2.2 bouyer bbt->nbbt_bitmap[block / 4] &= clean; 214 1.1.2.2 bouyer bbt->nbbt_bitmap[block / 4] |= marker; 215 1.1.2.2 bouyer } 216 1.1.2.2 bouyer 217 1.1.2.2 bouyer bool 218 1.1.2.2 bouyer nand_bbt_block_isbad(device_t self, flash_addr_t block) 219 1.1.2.2 bouyer { 220 1.1.2.2 bouyer struct nand_softc *sc = device_private(self); 221 1.1.2.2 bouyer #ifdef DIAGNOSTIC 222 1.1.2.2 bouyer struct nand_chip *chip = &sc->sc_chip; 223 1.1.2.2 bouyer #endif 224 1.1.2.2 bouyer struct nand_bbt *bbt = &sc->sc_bbt; 225 1.1.2.2 bouyer uint8_t byte, marker; 226 1.1.2.2 bouyer bool result; 227 1.1.2.2 bouyer 228 1.1.2.2 bouyer KASSERT(block < chip->nc_size / chip->nc_block_size); 229 1.1.2.2 bouyer 230 1.1.2.2 bouyer /* get byte containing the 2 bit marker for this block */ 231 1.1.2.2 bouyer byte = bbt->nbbt_bitmap[block / 4]; 232 1.1.2.2 bouyer 233 1.1.2.2 bouyer /* extract the 2 bit marker from the byte */ 234 1.1.2.2 bouyer marker = (byte >> ((block % 4) * 2)) & 0x03; 235 1.1.2.2 bouyer 236 1.1.2.2 bouyer switch (marker) { 237 1.1.2.2 bouyer case NAND_BBT_MARKER_FACTORY_BAD: 238 1.1.2.2 bouyer case NAND_BBT_MARKER_WORNOUT_BAD: 239 1.1.2.2 bouyer case NAND_BBT_MARKER_RESERVED: 240 1.1.2.2 bouyer result = true; 241 1.1.2.2 bouyer break; 242 1.1.2.2 bouyer case NAND_BBT_MARKER_GOOD: 243 1.1.2.2 bouyer result = false; 244 1.1.2.2 bouyer break; 245 1.1.2.2 bouyer default: 246 1.1.2.2 bouyer panic("error in marker extraction"); 247 1.1.2.2 bouyer } 248 1.1.2.2 bouyer 249 1.1.2.2 bouyer return result; 250 1.1.2.2 bouyer } 251
Indexes created Thu Oct 02 14:10:14 GMT 2025