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311 lines
7.4 KiB
C
311 lines
7.4 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2011 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "yportenv.h"
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#include "yaffs_mtdif.h"
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#include "linux/mtd/mtd.h"
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#include "linux/types.h"
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#include "linux/time.h"
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#include "linux/mtd/nand.h"
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#include "linux/kernel.h"
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#include "linux/version.h"
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#include "linux/types.h"
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0))
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#include "uapi/linux/major.h"
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#endif
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#include "yaffs_trace.h"
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#include "yaffs_guts.h"
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#include "yaffs_linux.h"
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
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#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
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#endif
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
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#define mtd_erase(m, ei) (m)->erase(m, ei)
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#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
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#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
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#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
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#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
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#endif
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int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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u32 addr =
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((loff_t) block_no) * dev->param.total_bytes_per_chunk *
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dev->param.chunks_per_block;
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struct erase_info ei;
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int retval = 0;
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
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ei.time = 1000;
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ei.retries = 2;
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ei.callback = NULL;
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ei.priv = (u_long) dev;
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retval = mtd_erase(mtd, &ei);
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if (retval == 0)
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return YAFFS_OK;
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return YAFFS_FAIL;
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}
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static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
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const u8 *data, int data_len,
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const u8 *oob, int oob_len)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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loff_t addr;
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struct mtd_oob_ops ops;
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int retval;
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yaffs_trace(YAFFS_TRACE_MTD,
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"yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
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dev, nand_chunk, data, data_len, oob, oob_len);
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if (!data || !data_len) {
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data = NULL;
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data_len = 0;
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}
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if (!oob || !oob_len) {
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oob = NULL;
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oob_len = 0;
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}
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addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
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memset(&ops, 0, sizeof(ops));
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = (data) ? data_len : 0;
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ops.ooblen = oob_len;
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ops.datbuf = (u8 *)data;
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ops.oobbuf = (u8 *)oob;
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retval = mtd_write_oob(mtd, addr, &ops);
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if (retval) {
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yaffs_trace(YAFFS_TRACE_MTD,
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"write_oob failed, chunk %d, mtd error %d",
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nand_chunk, retval);
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}
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return retval ? YAFFS_FAIL : YAFFS_OK;
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}
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static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
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u8 *data, int data_len,
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u8 *oob, int oob_len,
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enum yaffs_ecc_result *ecc_result)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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loff_t addr;
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struct mtd_oob_ops ops;
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int retval;
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addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
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memset(&ops, 0, sizeof(ops));
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = (data) ? data_len : 0;
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ops.ooblen = oob_len;
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ops.datbuf = data;
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ops.oobbuf = oob;
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#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20))
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/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
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* help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
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*/
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ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
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#endif
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/* Read page and oob using MTD.
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* Check status and determine ECC result.
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*/
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retval = mtd_read_oob(mtd, addr, &ops);
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if (retval)
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yaffs_trace(YAFFS_TRACE_MTD,
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"read_oob failed, chunk %d, mtd error %d",
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nand_chunk, retval);
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switch (retval) {
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case 0:
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/* no error */
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if(ecc_result)
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*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
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break;
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case -EUCLEAN:
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/* MTD's ECC fixed the data */
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if(ecc_result)
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*ecc_result = YAFFS_ECC_RESULT_FIXED;
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dev->n_ecc_fixed++;
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break;
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case -EBADMSG:
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default:
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/* MTD's ECC could not fix the data */
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dev->n_ecc_unfixed++;
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if(ecc_result)
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*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
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return YAFFS_FAIL;
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}
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return YAFFS_OK;
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}
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static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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loff_t addr;
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struct erase_info ei;
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int retval = 0;
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u32 block_size;
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block_size = dev->param.total_bytes_per_chunk *
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dev->param.chunks_per_block;
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addr = ((loff_t) block_no) * block_size;
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = block_size;
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ei.time = 1000;
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ei.retries = 2;
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ei.callback = NULL;
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ei.priv = (u_long) dev;
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retval = mtd_erase(mtd, &ei);
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if (retval == 0)
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return YAFFS_OK;
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return YAFFS_FAIL;
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}
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static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
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int retval;
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yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
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retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
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return (retval) ? YAFFS_FAIL : YAFFS_OK;
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}
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static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
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int retval;
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yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
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retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
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return (retval) ? YAFFS_FAIL : YAFFS_OK;
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}
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static int yaffs_mtd_initialise(struct yaffs_dev *dev)
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{
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return YAFFS_OK;
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}
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static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
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{
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return YAFFS_OK;
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}
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void yaffs_mtd_drv_install(struct yaffs_dev *dev)
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{
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struct yaffs_driver *drv = &dev->drv;
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drv->drv_write_chunk_fn = yaffs_mtd_write;
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drv->drv_read_chunk_fn = yaffs_mtd_read;
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drv->drv_erase_fn = yaffs_mtd_erase;
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drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
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drv->drv_check_bad_fn = yaffs_mtd_check_bad;
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drv->drv_initialise_fn = yaffs_mtd_initialise;
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drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
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}
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struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
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{
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struct mtd_info *mtd;
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mtd = yaffs_get_mtd_device(sdev);
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/* Check it's an mtd device..... */
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if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
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return NULL; /* This isn't an mtd device */
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/* Check it's NAND */
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if (mtd->type != MTD_NANDFLASH && mtd->type != MTD_MLCNANDFLASH) {
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"yaffs: MTD device is not NAND it's type %d",
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mtd->type);
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return NULL;
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}
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yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
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yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
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yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
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yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
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#else
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yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
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#endif
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return mtd;
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}
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int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
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{
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if (yaffs_version == 2) {
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if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
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mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
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!inband_tags) {
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"MTD device does not have the right page sizes"
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);
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return -1;
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}
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} else {
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if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
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mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"MTD device does not support have the right page sizes"
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);
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return -1;
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}
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}
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return 0;
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}
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void yaffs_put_mtd_device(struct mtd_info *mtd)
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{
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if(mtd)
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put_mtd_device(mtd);
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}
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