yaffs_mtdif2.c 5.8 KB

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  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. /* mtd interface for YAFFS2 */
  14. /* XXX U-BOOT XXX */
  15. #include <common.h>
  16. #include <linux/bug.h>
  17. #include <linux/errno.h>
  18. #include "yportenv.h"
  19. #include "yaffs_trace.h"
  20. #include "yaffs_mtdif2.h"
  21. #include <linux/mtd/mtd.h>
  22. #include <linux/types.h>
  23. #include <linux/time.h>
  24. #include "yaffs_trace.h"
  25. #include "yaffs_packedtags2.h"
  26. #define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
  27. #define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
  28. /* NB For use with inband tags....
  29. * We assume that the data buffer is of size total_bytes_per_chunk so
  30. * that we can also use it to load the tags.
  31. */
  32. int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
  33. const u8 *data,
  34. const struct yaffs_ext_tags *tags)
  35. {
  36. struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
  37. struct mtd_oob_ops ops;
  38. int retval = 0;
  39. loff_t addr;
  40. struct yaffs_packed_tags2 pt;
  41. int packed_tags_size =
  42. dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
  43. void *packed_tags_ptr =
  44. dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
  45. yaffs_trace(YAFFS_TRACE_MTD,
  46. "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
  47. nand_chunk, data, tags);
  48. addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
  49. /* For yaffs2 writing there must be both data and tags.
  50. * If we're using inband tags, then the tags are stuffed into
  51. * the end of the data buffer.
  52. */
  53. if (!data || !tags)
  54. BUG();
  55. else if (dev->param.inband_tags) {
  56. struct yaffs_packed_tags2_tags_only *pt2tp;
  57. pt2tp =
  58. (struct yaffs_packed_tags2_tags_only *)(data +
  59. dev->
  60. data_bytes_per_chunk);
  61. yaffs_pack_tags2_tags_only(pt2tp, tags);
  62. } else {
  63. yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
  64. }
  65. ops.mode = MTD_OPS_AUTO_OOB;
  66. ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
  67. ops.len = dev->param.total_bytes_per_chunk;
  68. ops.ooboffs = 0;
  69. ops.datbuf = (u8 *) data;
  70. ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
  71. retval = mtd_write_oob(mtd, addr, &ops);
  72. if (retval == 0)
  73. return YAFFS_OK;
  74. else
  75. return YAFFS_FAIL;
  76. }
  77. int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
  78. u8 *data, struct yaffs_ext_tags *tags)
  79. {
  80. struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
  81. u8 local_spare[128];
  82. struct mtd_oob_ops ops;
  83. size_t dummy;
  84. int retval = 0;
  85. int local_data = 0;
  86. struct yaffs_packed_tags2 pt;
  87. loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
  88. int packed_tags_size =
  89. dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
  90. void *packed_tags_ptr =
  91. dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
  92. yaffs_trace(YAFFS_TRACE_MTD,
  93. "nandmtd2_read_chunk_tags chunk %d data %p tags %p",
  94. nand_chunk, data, tags);
  95. if (dev->param.inband_tags) {
  96. if (!data) {
  97. local_data = 1;
  98. data = yaffs_get_temp_buffer(dev);
  99. }
  100. }
  101. if (dev->param.inband_tags || (data && !tags))
  102. retval = mtd_read(mtd, addr, dev->param.total_bytes_per_chunk,
  103. &dummy, data);
  104. else if (tags) {
  105. ops.mode = MTD_OPS_AUTO_OOB;
  106. ops.ooblen = packed_tags_size;
  107. ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
  108. ops.ooboffs = 0;
  109. ops.datbuf = data;
  110. ops.oobbuf = local_spare;
  111. retval = mtd_read_oob(mtd, addr, &ops);
  112. }
  113. if (dev->param.inband_tags) {
  114. if (tags) {
  115. struct yaffs_packed_tags2_tags_only *pt2tp;
  116. pt2tp =
  117. (struct yaffs_packed_tags2_tags_only *)
  118. &data[dev->data_bytes_per_chunk];
  119. yaffs_unpack_tags2_tags_only(tags, pt2tp);
  120. }
  121. } else {
  122. if (tags) {
  123. memcpy(packed_tags_ptr,
  124. local_spare,
  125. packed_tags_size);
  126. yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
  127. }
  128. }
  129. if (local_data)
  130. yaffs_release_temp_buffer(dev, data);
  131. if (tags && retval == -EBADMSG
  132. && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
  133. tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
  134. dev->n_ecc_unfixed++;
  135. }
  136. if (tags && retval == -EUCLEAN
  137. && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
  138. tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
  139. dev->n_ecc_fixed++;
  140. }
  141. if (retval == 0)
  142. return YAFFS_OK;
  143. else
  144. return YAFFS_FAIL;
  145. }
  146. int nandmtd2_MarkNANDBlockBad(struct yaffs_dev *dev, int blockNo)
  147. {
  148. struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  149. int retval;
  150. yaffs_trace(YAFFS_TRACE_MTD,
  151. "nandmtd2_MarkNANDBlockBad %d", blockNo);
  152. retval =
  153. mtd_block_markbad(mtd,
  154. blockNo * dev->param.chunks_per_block *
  155. dev->data_bytes_per_chunk);
  156. if (retval == 0)
  157. return YAFFS_OK;
  158. else
  159. return YAFFS_FAIL;
  160. }
  161. int nandmtd2_QueryNANDBlock(struct yaffs_dev *dev, int blockNo,
  162. enum yaffs_block_state *state, u32 *sequenceNumber)
  163. {
  164. struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  165. int retval;
  166. yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_QueryNANDBlock %d", blockNo);
  167. retval =
  168. mtd_block_isbad(mtd,
  169. blockNo * dev->param.chunks_per_block *
  170. dev->data_bytes_per_chunk);
  171. if (retval) {
  172. yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
  173. *state = YAFFS_BLOCK_STATE_DEAD;
  174. *sequenceNumber = 0;
  175. } else {
  176. struct yaffs_ext_tags t;
  177. nandmtd2_read_chunk_tags(dev,
  178. blockNo *
  179. dev->param.chunks_per_block, NULL,
  180. &t);
  181. if (t.chunk_used) {
  182. *sequenceNumber = t.seq_number;
  183. *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
  184. } else {
  185. *sequenceNumber = 0;
  186. *state = YAFFS_BLOCK_STATE_EMPTY;
  187. }
  188. }
  189. yaffs_trace(YAFFS_TRACE_MTD, "block is bad seq %d state %d",
  190. *sequenceNumber, *state);
  191. if (retval == 0)
  192. return YAFFS_OK;
  193. else
  194. return YAFFS_FAIL;
  195. }