2006-12-04 19:23:06 +01:00
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/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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2009-05-01 16:41:06 +02:00
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FILE_LICENCE ( GPL2_OR_LATER );
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2006-12-04 19:23:06 +01:00
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#include <stdint.h>
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2006-12-06 19:51:31 +01:00
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#include <string.h>
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#include <errno.h>
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2006-12-04 20:06:07 +01:00
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#include <assert.h>
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2006-12-04 19:23:06 +01:00
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#include <gpxe/nvs.h>
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/** @file
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*
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* Non-volatile storage
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*
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*/
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2006-12-04 20:06:07 +01:00
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/**
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* Read from non-volatile storage device
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*
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* @v nvs NVS device
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* @v address Address from which to read
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* @v data Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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2006-12-04 19:23:06 +01:00
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int nvs_read ( struct nvs_device *nvs, unsigned int address,
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void *data, size_t len ) {
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2006-12-04 20:06:07 +01:00
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size_t frag_len;
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int rc;
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/* We don't even attempt to handle buffer lengths that aren't
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* an integral number of words.
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*/
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assert ( ( len & ( ( 1 << nvs->word_len_log2 ) - 1 ) ) == 0 );
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while ( len ) {
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/* Calculate space remaining up to next block boundary */
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frag_len = ( ( nvs->block_size -
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( address & ( nvs->block_size - 1 ) ) )
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<< nvs->word_len_log2 );
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/* Limit to space remaining in buffer */
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if ( frag_len > len )
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frag_len = len;
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/* Read this portion of the buffer from the device */
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if ( ( rc = nvs->read ( nvs, address, data, frag_len ) ) != 0 )
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return rc;
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/* Update parameters */
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data += frag_len;
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address += ( frag_len >> nvs->word_len_log2 );
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len -= frag_len;
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}
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return 0;
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2006-12-04 19:23:06 +01:00
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}
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2006-12-04 23:06:54 +01:00
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2006-12-06 19:51:31 +01:00
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/**
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* Verify content of non-volatile storage device
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*
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* @v nvs NVS device
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* @v address Address from which to read
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* @v data Data to compare against
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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static int nvs_verify ( struct nvs_device *nvs, unsigned int address,
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const void *data, size_t len ) {
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uint8_t read_data[len];
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int rc;
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/* Read data into temporary buffer */
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if ( ( rc = nvs_read ( nvs, address, read_data, len ) ) != 0 )
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return rc;
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/* Compare data */
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if ( memcmp ( data, read_data, len ) != 0 ) {
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2007-12-07 01:11:43 +01:00
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DBG ( "NVS %p verification failed at %#04x+%zd\n",
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2006-12-06 19:51:31 +01:00
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nvs, address, len );
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2006-12-20 15:11:50 +01:00
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return -EIO;
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2006-12-06 19:51:31 +01:00
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}
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return 0;
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}
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2006-12-04 23:06:54 +01:00
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/**
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* Write to non-volatile storage device
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*
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* @v nvs NVS device
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* @v address Address to which to write
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* @v data Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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int nvs_write ( struct nvs_device *nvs, unsigned int address,
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const void *data, size_t len ) {
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size_t frag_len;
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int rc;
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/* We don't even attempt to handle buffer lengths that aren't
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* an integral number of words.
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*/
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assert ( ( len & ( ( 1 << nvs->word_len_log2 ) - 1 ) ) == 0 );
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while ( len ) {
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/* Calculate space remaining up to next block boundary */
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frag_len = ( ( nvs->block_size -
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( address & ( nvs->block_size - 1 ) ) )
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<< nvs->word_len_log2 );
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/* Limit to space remaining in buffer */
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if ( frag_len > len )
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frag_len = len;
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2006-12-06 19:51:31 +01:00
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/* Write this portion of the buffer to the device */
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2006-12-04 23:06:54 +01:00
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if ( ( rc = nvs->write ( nvs, address, data, frag_len ) ) != 0)
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return rc;
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2006-12-06 19:51:31 +01:00
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/* Read back and verify data */
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if ( ( rc = nvs_verify ( nvs, address, data, frag_len ) ) != 0)
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return rc;
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2006-12-04 23:06:54 +01:00
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/* Update parameters */
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data += frag_len;
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address += ( frag_len >> nvs->word_len_log2 );
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len -= frag_len;
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}
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return 0;
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}
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