xref: /openbmc/u-boot/fs/yaffs2/yaffs_mtdif.c (revision b55c89ce)
1 /*
2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3  *
4  * Copyright (C) 2002-2007 Aleph One Ltd.
5  *   for Toby Churchill Ltd and Brightstar Engineering
6  *
7  * Created by Charles Manning <charles@aleph1.co.uk>
8  *
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.
12  */
13 
14 /* XXX U-BOOT XXX */
15 #include <common.h>
16 
17 #include "yportenv.h"
18 
19 
20 #include "yaffs_mtdif.h"
21 
22 #include <linux/mtd/mtd.h>
23 #include <linux/types.h>
24 #include <linux/time.h>
25 #include <linux/mtd/rawnand.h>
26 
27 
translate_spare2oob(const struct yaffs_spare * spare,u8 * oob)28 static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
29 {
30 	oob[0] = spare->tb0;
31 	oob[1] = spare->tb1;
32 	oob[2] = spare->tb2;
33 	oob[3] = spare->tb3;
34 	oob[4] = spare->tb4;
35 	oob[5] = spare->tb5 & 0x3f;
36 	oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
37 	oob[5] |= spare->page_status == 0 ? 0 : 0x40;
38 	oob[6] = spare->tb6;
39 	oob[7] = spare->tb7;
40 }
41 
translate_oob2spare(struct yaffs_spare * spare,u8 * oob)42 static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
43 {
44 	struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
45 	spare->tb0 = oob[0];
46 	spare->tb1 = oob[1];
47 	spare->tb2 = oob[2];
48 	spare->tb3 = oob[3];
49 	spare->tb4 = oob[4];
50 	spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
51 	spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
52 	spare->page_status = oob[5] & 0x40 ? 0xff : 0;
53 	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
54 	spare->tb6 = oob[6];
55 	spare->tb7 = oob[7];
56 	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
57 
58 	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
59 }
60 
61 
nandmtd_WriteChunkToNAND(struct yaffs_dev * dev,int chunkInNAND,const u8 * data,const struct yaffs_spare * spare)62 int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
63 			     const u8 *data, const struct yaffs_spare *spare)
64 {
65 	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
66 	struct mtd_oob_ops ops;
67 	size_t dummy;
68 	int retval = 0;
69 	loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
70 	u8 spareAsBytes[8]; /* OOB */
71 
72 	if (data && !spare)
73 		retval = mtd_write(mtd, addr, dev->data_bytes_per_chunk,
74 				&dummy, data);
75 	else if (spare) {
76 		if (dev->param.use_nand_ecc) {
77 			translate_spare2oob(spare, spareAsBytes);
78 			ops.mode = MTD_OPS_AUTO_OOB;
79 			ops.ooblen = 8; /* temp hack */
80 		} else {
81 			ops.mode = MTD_OPS_RAW;
82 			ops.ooblen = YAFFS_BYTES_PER_SPARE;
83 		}
84 		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
85 		ops.datbuf = (u8 *)data;
86 		ops.ooboffs = 0;
87 		ops.oobbuf = spareAsBytes;
88 		retval = mtd_write_oob(mtd, addr, &ops);
89 	}
90 
91 	if (retval == 0)
92 		return YAFFS_OK;
93 	else
94 		return YAFFS_FAIL;
95 }
96 
nandmtd_ReadChunkFromNAND(struct yaffs_dev * dev,int chunkInNAND,u8 * data,struct yaffs_spare * spare)97 int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
98 			      struct yaffs_spare *spare)
99 {
100 	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
101 	struct mtd_oob_ops ops;
102 	size_t dummy;
103 	int retval = 0;
104 
105 	loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
106 	u8 spareAsBytes[8]; /* OOB */
107 
108 	if (data && !spare)
109 		retval = mtd_read(mtd, addr, dev->data_bytes_per_chunk,
110 				&dummy, data);
111 	else if (spare) {
112 		if (dev->param.use_nand_ecc) {
113 			ops.mode = MTD_OPS_AUTO_OOB;
114 			ops.ooblen = 8; /* temp hack */
115 		} else {
116 			ops.mode = MTD_OPS_RAW;
117 			ops.ooblen = YAFFS_BYTES_PER_SPARE;
118 		}
119 		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
120 		ops.datbuf = data;
121 		ops.ooboffs = 0;
122 		ops.oobbuf = spareAsBytes;
123 		retval = mtd_read_oob(mtd, addr, &ops);
124 		if (dev->param.use_nand_ecc)
125 			translate_oob2spare(spare, spareAsBytes);
126 	}
127 
128 	if (retval == 0)
129 		return YAFFS_OK;
130 	else
131 		return YAFFS_FAIL;
132 }
133 
nandmtd_EraseBlockInNAND(struct yaffs_dev * dev,int blockNumber)134 int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
135 {
136 	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
137 	__u32 addr =
138 	    ((loff_t) blockNumber) * dev->data_bytes_per_chunk
139 		* dev->param.chunks_per_block;
140 	struct erase_info ei;
141 	int retval = 0;
142 
143 	ei.mtd = mtd;
144 	ei.addr = addr;
145 	ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
146 	ei.time = 1000;
147 	ei.retries = 2;
148 	ei.callback = NULL;
149 	ei.priv = (u_long) dev;
150 
151 	/* Todo finish off the ei if required */
152 
153 
154 	retval = mtd_erase(mtd, &ei);
155 
156 	if (retval == 0)
157 		return YAFFS_OK;
158 	else
159 		return YAFFS_FAIL;
160 }
161 
nandmtd_InitialiseNAND(struct yaffs_dev * dev)162 int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
163 {
164 	return YAFFS_OK;
165 }
166