From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-we0-f171.google.com ([74.125.82.171]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WSMcB-0002Bk-QM for linux-mtd@lists.infradead.org; Tue, 25 Mar 2014 08:21:44 +0000 Received: by mail-we0-f171.google.com with SMTP id t61so79236wes.30 for ; Tue, 25 Mar 2014 01:21:21 -0700 (PDT) From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RFC 33/47] mtd: nand: stm_nand_bch: search for and load flash-resident BBT Date: Tue, 25 Mar 2014 08:19:50 +0000 Message-Id: <1395735604-26706-34-git-send-email-lee.jones@linaro.org> In-Reply-To: <1395735604-26706-1-git-send-email-lee.jones@linaro.org> References: <1395735604-26706-1-git-send-email-lee.jones@linaro.org> Cc: angus.clark@st.com, kernel@stlinux.com, lee.jones@linaro.org, linux-mtd@lists.infradead.org, pekon@ti.com, computersforpeace@gmail.com, dwmw2@infradead.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , If a BBT already exists in flash, it's this function's task to locate it and load it into the driver for local consumption. Signed-off-by: Lee Jones --- drivers/mtd/nand/stm_nand_bch.c | 87 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c index d7d97720..d1d84c1 100644 --- a/drivers/mtd/nand/stm_nand_bch.c +++ b/drivers/mtd/nand/stm_nand_bch.c @@ -973,6 +973,93 @@ static int bch_find_ibbt_sig(struct nandi_controller *nandi, return 1; } +/* Search for and load Flash-resident BBT, updating Primary/Mirror if req'd */ +static int bch_load_bbt(struct nandi_controller *nandi, + struct nandi_bbt_info *bbt_info) +{ + unsigned int update = 0; + uint32_t block; + loff_t offs; + uint8_t vers; + char author[64]; + int bak; + + dev_dbg(nandi->dev, "looking for Flash-resident BBTs\n"); + + bbt_info->bbt_block[0] = 0; + bbt_info->bbt_block[1] = 0; + bbt_info->bbt_vers[0] = 0; + bbt_info->bbt_vers[1] = 0; + + /* Look for IBBT signatures */ + for (block = nandi->blocks_per_device - NAND_IBBT_NBLOCKS; + block < nandi->blocks_per_device; + block++) { + offs = (loff_t)block << nandi->block_shift; + + if (bch_find_ibbt_sig(nandi, block, &bak, &vers, author)) { + dev_dbg(nandi->dev, + "found BBT [%s:%u] at 0x%012llx [%u] (%s)\n", + bbt_strs[bak], vers, offs, block, + author); + + if (bbt_info->bbt_block[bak] == 0 || + ((int8_t)(bbt_info->bbt_vers[bak] - vers)) < 0) { + bbt_info->bbt_block[bak] = block; + bbt_info->bbt_vers[bak] = vers; + } + } + } + + /* What have we found? */ + if (bbt_info->bbt_block[0] == 0 && bbt_info->bbt_block[1] == 0) { + /* no primary, no mirror: return error */ + return 1; + } else if (bbt_info->bbt_block[0] == 0) { + /* no primary: use mirror, update primary */ + bak = 1; + update = NAND_IBBT_UPDATE_PRIMARY; + bbt_info->bbt_block[0] = nandi->blocks_per_device - 1; + } else if (bbt_info->bbt_block[1] == 0) { + /* no mirror: use primary, update mirror */ + bak = 0; + update = NAND_IBBT_UPDATE_MIRROR; + bbt_info->bbt_block[1] = nandi->blocks_per_device - 1; + } else if (bbt_info->bbt_vers[0] == bbt_info->bbt_vers[1]) { + /* primary == mirror: use primary, no update required */ + bak = 0; + } else if ((int8_t)(bbt_info->bbt_vers[1] - + bbt_info->bbt_vers[0]) < 0) { + /* primary > mirror: use primary, update mirror */ + bak = 0; + update = NAND_IBBT_UPDATE_MIRROR; + } else { + /* mirror > primary: use mirror, update primary */ + bak = 1; + update = NAND_IBBT_UPDATE_PRIMARY; + } + + vers = bbt_info->bbt_vers[bak]; + block = bbt_info->bbt_block[bak]; + offs = block << nandi->block_shift; + dev_info(nandi->dev, "using BBT [%s:%u] at 0x%012llx [%u]\n", + bbt_strs[bak], vers, offs, block); + + /* Read BBT data */ + if (bch_read_page(nandi, offs, bbt_info->bbt) < 0) { + dev_err(nandi->dev, + "error while reading BBT %s:%u] at 0x%012llx [%u]\n", + bbt_strs[bak], vers, offs, block); + return 1; + } + + /* Update other BBT if required */ + if (update) + bch_update_bbts(nandi, bbt_info, update, vers); + + return 0; +} + /* * Initialisation */ -- 1.8.3.2