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a8aef3acbc
Most devices do not use SPI before they initialize CBMEM. This change initializes spi_flash in the CBMEM_INIT_HOOK to initialize the postram cbfs cache so it is not overwritten when boot_device_init is called later. BUG=chromium:210230 BRANCH=none TEST=confirm that the first cbfs access can occur before RAM initialized and after on panther and jerry. Change-Id: If3b6efc04082190e81c3773c0d3ce116bb12421f Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 0ab242786a16eba7fb423694f6b266e27d7660ec Original-Change-Id: I5f884b473e51e6813fdd726bba06b56baf3841b0 Original-Signed-off-by: Mary Ruthven <mruthven@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/314311 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/12601 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
79 lines
2 KiB
C
79 lines
2 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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/*
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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 <boot_device.h>
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#include <spi_flash.h>
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#include <symbols.h>
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#include <cbmem.h>
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static struct spi_flash *spi_flash_info;
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static ssize_t spi_readat(const struct region_device *rd, void *b,
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size_t offset, size_t size)
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{
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if (spi_flash_info->read(spi_flash_info, offset, size, b))
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return -1;
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return size;
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}
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static const struct region_device_ops spi_ops = {
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.mmap = mmap_helper_rdev_mmap,
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.munmap = mmap_helper_rdev_munmap,
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.readat = spi_readat,
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};
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static struct mmap_helper_region_device mdev =
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MMAP_HELPER_REGION_INIT(&spi_ops, 0, CONFIG_ROM_SIZE);
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static void initialize_mdev(int unused)
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{
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/*
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* Call boot_device_init() to ensure spi_flash is initialized before
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* backing mdev with postram cache. This prevents the mdev backing from
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* being overwritten if spi_flash was not accessed before dram was up.
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*/
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boot_device_init();
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mmap_helper_device_init(&mdev, _postram_cbfs_cache,
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_postram_cbfs_cache_size);
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}
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ROMSTAGE_CBMEM_INIT_HOOK(initialize_mdev);
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void boot_device_init(void)
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{
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int bus = CONFIG_BOOT_MEDIA_SPI_BUS;
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int cs = 0;
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if (spi_flash_info != NULL)
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return;
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spi_flash_info = spi_flash_probe(bus, cs);
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mmap_helper_device_init(&mdev, _cbfs_cache, _cbfs_cache_size);
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}
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/* Return the CBFS boot device. */
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const struct region_device *boot_device_ro(void)
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{
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if (spi_flash_info == NULL)
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return NULL;
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return &mdev.rdev;
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}
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