271 lines
8.3 KiB
C
271 lines
8.3 KiB
C
/****************************************************************************
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* drivers/mtd/mtd_nandmodel.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* This logic was based largely on Atmel sample code with modifications for
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* better integration with NuttX. The Atmel sample code has a BSD
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* compatible license that requires this copyright notice:
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*
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* Copyright (c) 2011, 2012, Atmel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the names NuttX nor Atmel nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/mtd/nand_config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/mtd/nand.h>
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#include <nuttx/mtd/nand_model.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nandmodel_find
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*
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* Description:
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* Looks for a nand_model_s corresponding to the given ID inside a list of
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* model. If found, the model variable is filled with the correct values.
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*
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* Input Parameters:
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* modeltab List of nand_model_s instances.
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* size Number of models in list.
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* chipid Identifier returned by the Nand(id1|(id2<<8)|(id3<<16)|(id4<<24)).
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* model nand_model_s instance to update with the model parameters.
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*
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* Returned Values:
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* OK is returned on success; -ENODEV is returned on failure.
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*
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****************************************************************************/
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int nandmodel_find(FAR const struct nand_model_s *modeltab, size_t size,
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uint32_t chipid, FAR struct nand_model_s *model)
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{
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uint8_t id2;
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uint8_t id4;
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bool found = false;
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int i;
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id2 = (uint8_t)(chipid >> 8);
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id4 = (uint8_t)(chipid >> 24);
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fvdbg("NAND ID is 0x%08x\n", (int)chipid);
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for (i = 0; i < size; i++)
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{
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if (modeltab[i].devid == id2)
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{
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fvdbg("NAND Model found: ID2=0x%02x ID4=0x%02x\n", id2, id4);
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found = true;
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if (model)
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{
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memcpy(model, &modeltab[i], sizeof(struct nand_model_s));
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if (model->blocksize == 0 || model->pagesize == 0)
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{
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/* Decode the extended ID4
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*
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* ID4 D5 D4 BlockSize || D1 D0 PageSize
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* 0 0 64K || 0 0 1K
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* 0 1 128K || 0 1 2K
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* 1 0 256K || 1 0 4K
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* 1 1 512K || 1 1 8k
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*/
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switch (id4 & 0x03)
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{
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case 0x00:
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model->pagesize = 1024;
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break;
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case 0x01:
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model->pagesize = 2048;
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break;
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case 0x02:
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model->pagesize = 4096;
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break;
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case 0x03:
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model->pagesize = 8192;
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break;
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}
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switch (id4 & 0x30)
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{
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case 0x00:
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model->blocksize = 64;
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break;
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case 0x10:
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model->blocksize = 128;
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break;
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case 0x20:
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model->blocksize = 256;
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break;
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case 0x30:
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model->blocksize = 512;
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break;
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}
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}
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fvdbg(" devid: 0x%02x\n", model->devid);
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fvdbg(" devsize: %d (MB)\n", model->devsize);
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fvdbg(" blocksize: %d (KB)\n", model->blocksize);
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fvdbg(" pagesize: %d (B)\n", model->pagesize);
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fvdbg(" options: 0x%02x\n", model->options);
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}
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break;
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}
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}
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/* Check if chip has been detected */
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return found ? OK : -ENODEV;
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}
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/****************************************************************************
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* Name: nandmodel_translate
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*
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* Description:
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* Translates address/size access of a nand_model_s to block, page and
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* offset values. The values are stored in the provided variables if their
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* pointer is not 0.
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*
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* Input Parameters:
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* model Pointer to a nand_model_s instance.
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* address Access address.
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* size Access size in bytes.
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* block Stores the first accessed block number.
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* page Stores the first accessed page number inside the first block.
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* offset Stores the byte offset inside the first accessed page.
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*
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* Returned Values:
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* OK on success; -EPIPE on failure.
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*
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****************************************************************************/
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int nandmodel_translate(FAR const struct nand_model_s *model, off_t address,
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size_t size, FAR off_t *block, off_t *page,
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off_t *offset)
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{
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size_t blocksize;
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size_t pagesize;
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off_t tmpblock;
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off_t tmppage;
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off_t tmpoffset;
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/* Check that access is not too big */
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if ((address + size) > nandmodel_getdevbytesize(model))
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{
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fvdbg("nandmodel_translate: out-of-bounds access.\n");
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return -ESPIPE;
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}
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/* Get Nand info */
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blocksize = nandmodel_getbyteblocksize(model);
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pagesize = nandmodel_getpagesize(model);
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/* Translate address */
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tmpblock = address / blocksize;
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address -= tmpblock * blocksize;
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tmppage = address / pagesize;
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address -= tmppage * pagesize;
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tmpoffset = address;
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/* Save results */
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if (block)
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{
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*block = tmpblock;
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}
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if (page)
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{
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*page = tmppage;
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}
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if (offset)
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{
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*offset = tmpoffset;
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}
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return OK;
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}
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/****************************************************************************
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* Name: nandmodel_getsparesize
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*
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* Description:
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* Returns the size of the spare area of a page in bytes.
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*
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* Input Parameters:
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* model Pointer to a nand_model_s instance.
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*
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* Returned Values:
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* size of spare area in bytes
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*
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****************************************************************************/
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unsigned int nandmodel_getsparesize(FAR const struct nand_model_s *model)
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{
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if (model->sparesize)
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{
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return model->sparesize;
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}
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else
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{
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return (model->pagesize >> 5); /* Spare size is 16/512 of data size */
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}
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}
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