96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* This file provides a common CBFS wrapper for SPI storage. SPI driver
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* context is expanded with the buffer descriptor used to store data read from
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* SPI.
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*/
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#include <cbfs.h>
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#include <spi_flash.h>
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/* SPI flash as CBFS media. */
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struct cbfs_spi_context {
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struct spi_flash *spi_flash_info;
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struct cbfs_simple_buffer buffer;
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};
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static struct cbfs_spi_context spi_context;
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static int cbfs_media_open(struct cbfs_media *media)
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{
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return 0;
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}
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static int cbfs_media_close(struct cbfs_media *media)
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{
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return 0;
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}
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static size_t cbfs_media_read(struct cbfs_media *media,
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void *dest, size_t offset,
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size_t count)
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{
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struct cbfs_spi_context *context = media->context;
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return context->spi_flash_info->read
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(context->spi_flash_info, offset, count, dest) ? 0 : count;
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}
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static void *cbfs_media_map(struct cbfs_media *media,
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size_t offset, size_t count)
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{
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struct cbfs_spi_context *context = media->context;
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return cbfs_simple_buffer_map(&context->buffer, media, offset, count);
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}
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static void *cbfs_media_unmap(struct cbfs_media *media,
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const void *address)
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{
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struct cbfs_spi_context *context = media->context;
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return cbfs_simple_buffer_unmap(&context->buffer, address);
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}
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int init_default_cbfs_media(struct cbfs_media *media)
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{
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if (spi_context.buffer.buffer)
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return 0; /* It has been already initialized. */
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spi_context.spi_flash_info = spi_flash_probe
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(CONFIG_BOOT_MEDIA_SPI_BUS, 0);
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if (!spi_context.spi_flash_info)
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return -1;
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spi_context.buffer.buffer = (void *)CONFIG_CBFS_CACHE_ADDRESS;
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spi_context.buffer.size = CONFIG_CBFS_CACHE_SIZE;
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media->context = &spi_context;
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media->open = cbfs_media_open;
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media->close = cbfs_media_close;
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media->read = cbfs_media_read;
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media->map = cbfs_media_map;
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media->unmap = cbfs_media_unmap;
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return 0;
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}
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