2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
16 #include "yaffs_mtdif.h"
18 #include "linux/mtd/mtd.h"
19 #include "linux/types.h"
20 #include "linux/time.h"
21 #include "linux/mtd/nand.h"
22 #include "linux/kernel.h"
23 #include "linux/version.h"
24 #include "linux/types.h"
26 #include "yaffs_trace.h"
27 #include "yaffs_guts.h"
28 #include "yaffs_linux.h"
31 int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
33 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
35 ((loff_t) block_no) * dev->param.total_bytes_per_chunk *
36 dev->param.chunks_per_block;
42 ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
46 ei.priv = (u_long) dev;
48 retval = mtd->erase(mtd, &ei);
57 static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
58 const u8 *data, int data_len,
59 const u8 *oob, int oob_len)
61 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
63 struct mtd_oob_ops ops;
66 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
67 memset(&ops, 0, sizeof(ops));
68 ops.mode = MTD_OPS_AUTO_OOB;
69 ops.len = (data) ? data_len : 0;
71 ops.datbuf = (u8 *)data;
72 ops.oobbuf = (u8 *)oob;
74 retval = mtd->write_oob(mtd, addr, &ops);
76 yaffs_trace(YAFFS_TRACE_MTD,
77 "write_oob failed, chunk %d, mtd error %d",
80 return retval ? YAFFS_FAIL : YAFFS_OK;
83 static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
84 u8 *data, int data_len,
86 enum yaffs_ecc_result *ecc_result)
88 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
90 struct mtd_oob_ops ops;
93 addr = ((loff_t) nand_chunk) * dev->data_bytes_per_chunk;
94 memset(&ops, 0, sizeof(ops));
95 ops.mode = MTD_OPS_AUTO_OOB;
96 ops.len = (data) ? data_len : 0;
101 /* Read page and oob using MTD.
102 * Check status and determine ECC result.
104 retval = mtd->read_oob(mtd, addr, &ops);
106 yaffs_trace(YAFFS_TRACE_MTD,
107 "read_oob failed, chunk %d, mtd error %d",
114 *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
118 /* MTD's ECC fixed the data */
120 *ecc_result = YAFFS_ECC_RESULT_FIXED;
126 /* MTD's ECC could not fix the data */
127 dev->n_ecc_unfixed++;
129 *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
136 static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
138 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
141 struct erase_info ei;
145 block_size = dev->param.total_bytes_per_chunk *
146 dev->param.chunks_per_block;
147 addr = ((loff_t) block_no) * block_size;
155 ei.priv = (u_long) dev;
157 retval = mtd->erase(mtd, &ei);
165 static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
167 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
168 int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
171 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
173 retval = mtd->block_markbad(mtd, (loff_t) blocksize * block_no);
174 return (retval) ? YAFFS_FAIL : YAFFS_OK;
177 static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
179 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
180 int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
183 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "checking block %d bad", block_no);
185 retval = mtd->block_isbad(mtd, (loff_t) blocksize * block_no);
186 return (retval) ? YAFFS_FAIL : YAFFS_OK;
189 static int yaffs_mtd_initialise(struct yaffs_dev *dev)
194 static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
201 void yaffs_mtd_drv_install(struct yaffs_dev *dev)
203 struct yaffs_driver *drv = &dev->drv;
205 drv->drv_write_chunk_fn = yaffs_mtd_write;
206 drv->drv_read_chunk_fn = yaffs_mtd_read;
207 drv->drv_erase_fn = yaffs_mtd_erase;
208 drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
209 drv->drv_check_bad_fn = yaffs_mtd_check_bad;
210 drv->drv_initialise_fn = yaffs_mtd_initialise;
211 drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;