diff options
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 127 |
1 files changed, 119 insertions, 8 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index fe34a4864..4069ab127 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -7,7 +7,7 @@ * Basic support for AG-AND chips is provided. * * Additional technical information is available on - * http://www.linux-mtd.infradead.org/tech/nand.html + * http://www.linux-mtd.infradead.org/doc/nand.html * * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) * 2002-2006 Thomas Gleixner (tglx@linutronix.de) @@ -24,6 +24,7 @@ * if we have HW ecc support. * The AG-AND chips have nice features for speed improvement, * which are not supported yet. Read / program 4 pages in one go. + * BBT table is not serialized, has to be fixed * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -128,7 +129,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to, static int nand_wait(struct mtd_info *mtd, struct nand_chip *this); /* - * For devices which display every fart in the system on a seperate LED. Is + * For devices which display every fart in the system on a separate LED. Is * compiled away when LED support is disabled. */ /* XXX U-BOOT XXX */ @@ -412,6 +413,7 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) /* We write two bytes, so we dont have to mess with 16 bit * access */ + nand_get_device(chip, mtd, FL_WRITING); ofs += mtd->oobsize; chip->ops.len = chip->ops.ooblen = 2; chip->ops.datbuf = NULL; @@ -419,9 +421,11 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) chip->ops.ooboffs = chip->badblockpos & ~0x01; ret = nand_do_write_oob(mtd, ofs, &chip->ops); + nand_release_device(mtd); } if (!ret) mtd->ecc_stats.badblocks++; + return ret; } @@ -911,7 +915,88 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip, int stat; stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]); - if (stat == -1) + if (stat < 0) + mtd->ecc_stats.failed++; + else + mtd->ecc_stats.corrected += stat; + } + return 0; +} + +/** + * nand_read_subpage - [REPLACABLE] software ecc based sub-page read function + * @mtd: mtd info structure + * @chip: nand chip info structure + * @dataofs offset of requested data within the page + * @readlen data length + * @buf: buffer to store read data + */ +static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi) +{ + int start_step, end_step, num_steps; + uint32_t *eccpos = chip->ecc.layout->eccpos; + uint8_t *p; + int data_col_addr, i, gaps = 0; + int datafrag_len, eccfrag_len, aligned_len, aligned_pos; + int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1; + + /* Column address wihin the page aligned to ECC size (256bytes). */ + start_step = data_offs / chip->ecc.size; + end_step = (data_offs + readlen - 1) / chip->ecc.size; + num_steps = end_step - start_step + 1; + + /* Data size aligned to ECC ecc.size*/ + datafrag_len = num_steps * chip->ecc.size; + eccfrag_len = num_steps * chip->ecc.bytes; + + data_col_addr = start_step * chip->ecc.size; + /* If we read not a page aligned data */ + if (data_col_addr != 0) + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1); + + p = bufpoi + data_col_addr; + chip->read_buf(mtd, p, datafrag_len); + + /* Calculate ECC */ + for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) + chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]); + + /* The performance is faster if to position offsets + according to ecc.pos. Let make sure here that + there are no gaps in ecc positions */ + for (i = 0; i < eccfrag_len - 1; i++) { + if (eccpos[i + start_step * chip->ecc.bytes] + 1 != + eccpos[i + start_step * chip->ecc.bytes + 1]) { + gaps = 1; + break; + } + } + if (gaps) { + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); + } else { + /* send the command to read the particular ecc bytes */ + /* take care about buswidth alignment in read_buf */ + aligned_pos = eccpos[start_step * chip->ecc.bytes] & ~(busw - 1); + aligned_len = eccfrag_len; + if (eccpos[start_step * chip->ecc.bytes] & (busw - 1)) + aligned_len++; + if (eccpos[(start_step + num_steps) * chip->ecc.bytes] & (busw - 1)) + aligned_len++; + + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize + aligned_pos, -1); + chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len); + } + + for (i = 0; i < eccfrag_len; i++) + chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + start_step * chip->ecc.bytes]]; + + p = bufpoi + data_col_addr; + for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) { + int stat; + + stat = chip->ecc.correct(mtd, p, &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]); + if (stat < 0) mtd->ecc_stats.failed++; else mtd->ecc_stats.corrected += stat; @@ -996,7 +1081,7 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip, chip->read_buf(mtd, oob, eccbytes); stat = chip->ecc.correct(mtd, p, oob, NULL); - if (stat == -1) + if (stat < 0) mtd->ecc_stats.failed++; else mtd->ecc_stats.corrected += stat; @@ -1116,6 +1201,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, /* Now read the page into the buffer */ if (unlikely(ops->mode == MTD_OOB_RAW)) ret = chip->ecc.read_page_raw(mtd, chip, bufpoi); + else if (!aligned && NAND_SUBPAGE_READ(chip) && !oob) + ret = chip->ecc.read_subpage(mtd, chip, col, bytes, bufpoi); else ret = chip->ecc.read_page(mtd, chip, bufpoi); if (ret < 0) @@ -1123,7 +1210,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, /* Transfer not aligned data */ if (!aligned) { - chip->pagebuf = realpage; + if (!NAND_SUBPAGE_READ(chip) && !oob) + chip->pagebuf = realpage; memcpy(buf, chip->buffers->databuf + col, bytes); } @@ -2193,13 +2281,14 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, erase_exit: ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; - /* Do call back function */ - if (!ret) - mtd_erase_callback(instr); /* Deselect and wake up anyone waiting on the device */ nand_release_device(mtd); + /* Do call back function */ + if (!ret) + mtd_erase_callback(instr); + /* * If BBT requires refresh and erase was successful, rewrite any * selected bad block tables @@ -2356,6 +2445,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd, { struct nand_flash_dev *type = NULL; int i, dev_id, maf_idx; + int tmp_id, tmp_manf; /* Select the device */ chip->select_chip(mtd, 0); @@ -2367,6 +2457,26 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd, *maf_id = chip->read_byte(mtd); dev_id = chip->read_byte(mtd); + /* Try again to make sure, as some systems the bus-hold or other + * interface concerns can cause random data which looks like a + * possibly credible NAND flash to appear. If the two results do + * not match, ignore the device completely. + */ + + chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); + + /* Read manufacturer and device IDs */ + + tmp_manf = chip->read_byte(mtd); + tmp_id = chip->read_byte(mtd); + + if (tmp_manf != *maf_id || tmp_id != dev_id) { + printk(KERN_INFO "%s: second ID read did not match " + "%02x,%02x against %02x,%02x\n", __func__, + *maf_id, dev_id, tmp_manf, tmp_id); + return ERR_PTR(-ENODEV); + } + /* Lookup the flash id */ for (i = 0; nand_flash_ids[i].name != NULL; i++) { if (dev_id == nand_flash_ids[i].id) { @@ -2630,6 +2740,7 @@ int nand_scan_tail(struct mtd_info *mtd) chip->ecc.calculate = nand_calculate_ecc; chip->ecc.correct = nand_correct_data; chip->ecc.read_page = nand_read_page_swecc; + chip->ecc.read_subpage = nand_read_subpage; chip->ecc.write_page = nand_write_page_swecc; chip->ecc.read_oob = nand_read_oob_std; chip->ecc.write_oob = nand_write_oob_std; |