| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2014 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * This file provides a common CBFS wrapper for SPI storage. SPI driver |
| * context is expanded with the buffer descriptor used to store data read from |
| * SPI. |
| */ |
| |
| #include <cbfs.h> |
| #include <spi_flash.h> |
| |
| /* SPI flash as CBFS media. */ |
| struct cbfs_spi_context { |
| struct spi_flash *spi_flash_info; |
| struct cbfs_simple_buffer buffer; |
| }; |
| |
| static struct cbfs_spi_context spi_context; |
| |
| static int cbfs_media_open(struct cbfs_media *media) |
| { |
| return 0; |
| } |
| |
| static int cbfs_media_close(struct cbfs_media *media) |
| { |
| return 0; |
| } |
| |
| static size_t cbfs_media_read(struct cbfs_media *media, |
| void *dest, size_t offset, |
| size_t count) |
| { |
| struct cbfs_spi_context *context = media->context; |
| |
| return context->spi_flash_info->read |
| (context->spi_flash_info, offset, count, dest) ? 0 : count; |
| } |
| |
| static void *cbfs_media_map(struct cbfs_media *media, |
| size_t offset, size_t count) |
| { |
| struct cbfs_spi_context *context = media->context; |
| |
| return cbfs_simple_buffer_map(&context->buffer, media, offset, count); |
| } |
| |
| static void *cbfs_media_unmap(struct cbfs_media *media, |
| const void *address) |
| { |
| struct cbfs_spi_context *context = media->context; |
| |
| return cbfs_simple_buffer_unmap(&context->buffer, address); |
| } |
| |
| int init_default_cbfs_media(struct cbfs_media *media) |
| { |
| if (spi_context.buffer.buffer) |
| return 0; /* It has been already initialized. */ |
| |
| spi_context.spi_flash_info = spi_flash_probe |
| (CONFIG_BOOT_MEDIA_SPI_BUS, 0); |
| if (!spi_context.spi_flash_info) |
| return -1; |
| |
| spi_context.buffer.buffer = (void *)CONFIG_CBFS_CACHE_ADDRESS; |
| spi_context.buffer.size = CONFIG_CBFS_CACHE_SIZE; |
| |
| media->context = &spi_context; |
| |
| media->open = cbfs_media_open; |
| media->close = cbfs_media_close; |
| media->read = cbfs_media_read; |
| media->map = cbfs_media_map; |
| media->unmap = cbfs_media_unmap; |
| |
| return 0; |
| } |