/**************************************************************************** * drivers/mtd/mtd_nandscheme.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * This logic was based largely on Atmel sample code with modifications for * better integration with NuttX. The Atmel sample code has a BSD * compatible license that requires this copyright notice: * * Copyright (c) 2012, Atmel Corporation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the names NuttX nor Atmel nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include /**************************************************************************** * Private Data ****************************************************************************/ /* Spare area placement scheme for 256 byte pages */ const struct nand_scheme_s g_nand_sparescheme256 = { 5, /* Bad block marker is at position #5 */ 3, /* 3 ecc bytes */ 4, /* 4 extra bytes */ {0, 1, 2}, /* Ecc bytes positions */ {3, 4, 6, 7}, /* Extra bytes positions */ }; /* Spare area placement scheme for 512 byte pages */ const struct nand_scheme_s g_nand_sparescheme512 = { 5, /* Bad block marker is at position #5 */ 6, /* 6 ecc bytes */ 8, /* 8 extra bytes */ {0, 1, 2, 3, 6, 7}, /* Ecc bytes positions */ {8, 9, 10, 11, 12, 13, 14, 15}, /* Extra bytes positions */ }; /* Spare area placement scheme for 2048 byte pages */ const struct nand_scheme_s g_nand_sparescheme2048 = { 0, /* Bad block marker is at position #0 */ 24, /* 24 ecc bytes */ 38, /* 38 extra bytes */ {40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63}, /* Ecc bytes positions */ { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39}, /* Extra bytes positions */ }; /* Spare area placement scheme for 4096 byte pages. */ const struct nand_scheme_s g_nand_sparescheme4096 = { 0, /* Bad block marker is at position #0 */ 48, /* 48 ecc bytes */ 78, /* 78 extra bytes */ {80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127}, /* Ecc bytes positions */ { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79}, /* Extra bytes positions */ }; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: nandscheme_readbadblockmarker * * Description: * Reads the bad block marker inside a spare area buffer using the provided * scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * marker Pointer to the variable to store the bad block marker. * * Returned Value: * None * ****************************************************************************/ void nandscheme_readbadblockmarker(FAR const struct nand_scheme_s *scheme, FAR const uint8_t *spare, FAR uint8_t *marker) { *marker = spare[scheme->bbpos]; } /**************************************************************************** * Name: nandscheme_readbadblockmarker * * Description: * Modifies the bad block marker inside a spare area, using the given * scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * marker Bad block marker to write. * * Returned Value: * None * ****************************************************************************/ void nandscheme_writebadblockmarker(FAR const struct nand_scheme_s *scheme, FAR uint8_t *spare, uint8_t marker) { spare[scheme->bbpos] = marker; } /**************************************************************************** * Name: nandscheme_readecc * * Description: * Reads ECC information from a spare area using the provided scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * ecc ECC buffer. * * Returned Value: * None * ****************************************************************************/ void nandscheme_readecc(FAR const struct nand_scheme_s *scheme, FAR const uint8_t *spare, FAR uint8_t *ecc) { int i; for (i = 0; i < scheme->eccsize; i++) { ecc[i] = spare[scheme->eccbytepos[i]]; } } /**************************************************************************** * Name: nandscheme_writeecc * * Description: * Writes ECC information in a spare area, using a particular scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * ecc ECC buffer. * * Returned Value: * None * ****************************************************************************/ void nandscheme_writeecc(FAR const struct nand_scheme_s *scheme, FAR uint8_t *spare, FAR const uint8_t *ecc) { int i; for (i = 0; i < scheme->eccsize; i++) { spare[scheme->eccbytepos[i]] = ecc[i]; } } /**************************************************************************** * Name: nandscheme_readextra * * Description: * Reads extra bytes of information from a spare area, using the provided * scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * extra Extra bytes buffer. * size Number of extra bytes to read. * offset Index where to read the first extra byte. * * Returned Value: * None * ****************************************************************************/ void nandscheme_readextra(FAR const struct nand_scheme_s *scheme, FAR const uint8_t *spare, FAR void *extra, unsigned int size, unsigned int offset) { DEBUGASSERT((size + offset) < scheme->nxbytes); int i; for (i = 0; i < size; i++) { ((uint8_t *)extra)[i] = spare[scheme->xbytepos[i + offset]]; } } /**************************************************************************** * Name: nandscheme_readextra * * Description: * Write extra bytes of information inside a spare area, using the provided * scheme. * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * spare Spare area buffer. * extra Extra bytes buffer. * size Number of extra bytes to write. * offset Index where to write the first extra byte. * * Returned Value: * None * ****************************************************************************/ void nandscheme_writeextra(FAR const struct nand_scheme_s *scheme, FAR uint8_t *spare, FAR const void *extra, unsigned int size, unsigned int offset) { DEBUGASSERT((size + offset) < scheme->nxbytes); uint32_t i; for (i = 0; i < size; i++) { spare[scheme->xbytepos[i + offset]] = ((uint8_t *) extra)[i]; } } /**************************************************************************** * Name: nandscheme_readextra * * Description: * Build a scheme instance for 4096 page size nand flash * * Input Parameters: * scheme Pointer to a nand_scheme_s instance. * sparesize Size of spare area. * offset Index where to write the first extra byte. * size Number of extra bytes to write. * offset Index where to write the first extra byte. * * Returned Value: * OK on success; a negated errno value on failure. * ****************************************************************************/ int nandscheme_build4086(FAR struct nand_scheme_s *scheme, unsigned int sparesize, unsigned int eccoffset) { uint8_t eccsize = g_nand_sparescheme4096.eccsize; int i; if ((eccoffset + eccsize) > sparesize) { return -E2BIG; } scheme->bbpos = g_nand_sparescheme4096.bbpos; scheme->eccsize = eccsize; for (i = 0; i < eccsize; i++) { scheme->eccbytepos[i] = eccoffset + i; } scheme->nxbytes = sparesize - eccsize - 2; for (i = 0; i < scheme->nxbytes; i++) { scheme->xbytepos[i] = 2 + i; } return OK; };