2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2018 Aleph One Ltd.
6 * Created by Charles Manning <charles@aleph1.co.uk>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
15 #include "yaffs_mtdif.h"
17 #include "linux/mtd/mtd.h"
18 #include "linux/types.h"
19 #include "linux/time.h"
20 #include "linux/mtd/nand.h"
21 #include "linux/kernel.h"
22 #include "linux/version.h"
23 #include "linux/types.h"
25 #include "yaffs_trace.h"
26 #include "yaffs_guts.h"
27 #include "yaffs_linux.h"
30 int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
32 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
34 ((loff_t) block_no) * dev->param.total_bytes_per_chunk *
35 dev->param.chunks_per_block;
41 ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
45 ei.priv = (u_long) dev;
47 retval = mtd->erase(mtd, &ei);
56 static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
57 const u8 *data, int data_len,
58 const u8 *oob, int oob_len)
60 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
62 struct mtd_oob_ops ops;
65 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
66 memset(&ops, 0, sizeof(ops));
67 ops.mode = MTD_OPS_AUTO_OOB;
68 ops.len = (data) ? data_len : 0;
70 ops.datbuf = (u8 *)data;
71 ops.oobbuf = (u8 *)oob;
73 retval = mtd->write_oob(mtd, addr, &ops);
75 yaffs_trace(YAFFS_TRACE_MTD,
76 "write_oob failed, chunk %d, mtd error %d",
79 return retval ? YAFFS_FAIL : YAFFS_OK;
82 static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
83 u8 *data, int data_len,
85 enum yaffs_ecc_result *ecc_result)
87 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
89 struct mtd_oob_ops ops;
92 addr = ((loff_t) nand_chunk) * dev->data_bytes_per_chunk;
93 memset(&ops, 0, sizeof(ops));
94 ops.mode = MTD_OPS_AUTO_OOB;
95 ops.len = (data) ? data_len : 0;
100 /* Read page and oob using MTD.
101 * Check status and determine ECC result.
103 retval = mtd->read_oob(mtd, addr, &ops);
105 yaffs_trace(YAFFS_TRACE_MTD,
106 "read_oob failed, chunk %d, mtd error %d",
113 *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
117 /* MTD's ECC fixed the data */
119 *ecc_result = YAFFS_ECC_RESULT_FIXED;
125 /* MTD's ECC could not fix the data */
126 dev->n_ecc_unfixed++;
128 *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
135 static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
137 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
140 struct erase_info ei;
144 block_size = dev->param.total_bytes_per_chunk *
145 dev->param.chunks_per_block;
146 addr = ((loff_t) block_no) * block_size;
154 ei.priv = (u_long) dev;
156 retval = mtd->erase(mtd, &ei);
164 static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
166 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
167 int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
170 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
172 retval = mtd->block_markbad(mtd, (loff_t) blocksize * block_no);
173 return (retval) ? YAFFS_FAIL : YAFFS_OK;
176 static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
178 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
179 int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
182 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "checking block %d bad", block_no);
184 retval = mtd->block_isbad(mtd, (loff_t) blocksize * block_no);
185 return (retval) ? YAFFS_FAIL : YAFFS_OK;
188 static int yaffs_mtd_initialise(struct yaffs_dev *dev)
193 static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
200 void yaffs_mtd_drv_install(struct yaffs_dev *dev)
202 struct yaffs_driver *drv = &dev->drv;
204 drv->drv_write_chunk_fn = yaffs_mtd_write;
205 drv->drv_read_chunk_fn = yaffs_mtd_read;
206 drv->drv_erase_fn = yaffs_mtd_erase;
207 drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
208 drv->drv_check_bad_fn = yaffs_mtd_check_bad;
209 drv->drv_initialise_fn = yaffs_mtd_initialise;
210 drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;