diff options
author | Alexander Couzens <lynxis@fe80.eu> | 2016-03-09 14:36:46 +0100 |
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committer | Martin Roth <martinroth@google.com> | 2016-03-11 19:00:14 +0100 |
commit | 92fc072c2faf3d1be82f50ee3feda42461e9ac16 (patch) | |
tree | df2232c7db3a895bbf854fe87a73ac2f2dac13e6 /src/northbridge/intel/common/mrc_cache.c | |
parent | 81c5c761b305dd62019759e5e39248b02c0af820 (diff) | |
download | coreboot-92fc072c2faf3d1be82f50ee3feda42461e9ac16.tar.xz |
northbridge/intel: move mrccache.c of sandybridge + haswell to common
The sourcecode is 99% the same. Only two lines differ, but not
in functionality.
Also rename mrccache.c -> mrc_cache.c
Tested-on: boot + suspend/resume on x220
Change-Id: I36f79d066336f223b608c70c847ea6ea6e4ad287
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: https://review.coreboot.org/14007
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/northbridge/intel/common/mrc_cache.c')
-rw-r--r-- | src/northbridge/intel/common/mrc_cache.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/src/northbridge/intel/common/mrc_cache.c b/src/northbridge/intel/common/mrc_cache.c new file mode 100644 index 0000000000..82b1005a7a --- /dev/null +++ b/src/northbridge/intel/common/mrc_cache.c @@ -0,0 +1,252 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 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. + */ + +#include <stdint.h> +#include <string.h> +#include <bootstate.h> +#include <console/console.h> +#include <cbfs.h> +#include <fmap.h> +#include <ip_checksum.h> +#include <device/device.h> +#include <cbmem.h> +#include <spi-generic.h> +#include <spi_flash.h> +#include "mrc_cache.h" + +/* convert a pointer to flash area into the offset inside the flash */ +static inline u32 to_flash_offset(struct spi_flash *flash, void *p) { + return ((u32)p + flash->size); +} + +static struct mrc_data_container *next_mrc_block( + struct mrc_data_container *mrc_cache) +{ + /* MRC data blocks are aligned within the region */ + u32 mrc_size = sizeof(*mrc_cache) + mrc_cache->mrc_data_size; + if (mrc_size & (MRC_DATA_ALIGN - 1UL)) { + mrc_size &= ~(MRC_DATA_ALIGN - 1UL); + mrc_size += MRC_DATA_ALIGN; + } + + u8 *region_ptr = (u8*)mrc_cache; + region_ptr += mrc_size; + return (struct mrc_data_container *)region_ptr; +} + +static int is_mrc_cache(struct mrc_data_container *mrc_cache) +{ + return (!!mrc_cache) && (mrc_cache->mrc_signature == MRC_DATA_SIGNATURE); +} + +/* Right now, the offsets for the MRC cache area are hard-coded in the + * northbridge Kconfig if CONFIG_CHROMEOS is not set. In order to make + * this more flexible, there are two of options: + * - Have each mainboard Kconfig supply a hard-coded offset + * - Use CBFS + */ +static u32 get_mrc_cache_region(struct mrc_data_container **mrc_region_ptr) +{ + size_t region_size = 0; + *mrc_region_ptr = NULL; + + if (IS_ENABLED(CONFIG_CHROMEOS)) { + struct region_device rdev; + + if (fmap_locate_area_as_rdev("RW_MRC_CACHE", &rdev) == 0) { + region_size = region_device_sz(&rdev); + *mrc_region_ptr = rdev_mmap_full(&rdev); + } + } else { + *mrc_region_ptr = cbfs_boot_map_with_leak("mrc.cache", + CBFS_TYPE_MRC_CACHE, + ®ion_size); + } + return region_size; +} + +/* + * Find the largest index block in the MRC cache. Return NULL if non is + * found. + */ +static struct mrc_data_container *find_current_mrc_cache_local + (struct mrc_data_container *mrc_cache, u32 region_size) +{ + u32 region_end; + u32 entry_id = 0; + struct mrc_data_container *mrc_next = mrc_cache; + + region_end = (u32) mrc_cache + region_size; + + /* Search for the last filled entry in the region */ + while (is_mrc_cache(mrc_next)) { + entry_id++; + mrc_cache = mrc_next; + mrc_next = next_mrc_block(mrc_next); + if ((u32)mrc_next >= region_end) { + /* Stay in the MRC data region */ + break; + } + } + + if (entry_id == 0) { + printk(BIOS_ERR, "%s: No valid MRC cache found.\n", __func__); + return NULL; + } + + /* Verify checksum */ + if (mrc_cache->mrc_checksum != + compute_ip_checksum(mrc_cache->mrc_data, + mrc_cache->mrc_data_size)) { + printk(BIOS_ERR, "%s: MRC cache checksum mismatch\n", __func__); + return NULL; + } + + printk(BIOS_DEBUG, "%s: picked entry %u from cache block\n", __func__, + entry_id - 1); + + return mrc_cache; +} + +/* SPI code needs malloc/free. + * Also unknown if writing flash from XIP-flash code is a good idea + */ + +/* find the first empty block in the MRC cache area. + * If there's none, return NULL. + * + * @mrc_cache_base - base address of the MRC cache area + * @mrc_cache - current entry (for which we need to find next) + * @region_size - total size of the MRC cache area + */ +static struct mrc_data_container *find_next_mrc_cache + (struct mrc_data_container *mrc_cache_base, + struct mrc_data_container *mrc_cache, + u32 region_size) +{ + u32 region_end = (u32) mrc_cache_base + region_size; + + mrc_cache = next_mrc_block(mrc_cache); + if ((u32)mrc_cache >= region_end) { + /* Crossed the boundary */ + mrc_cache = NULL; + printk(BIOS_DEBUG, "%s: no available entries found\n", + __func__); + } else { + printk(BIOS_DEBUG, + "%s: picked next entry from cache block at %p\n", + __func__, mrc_cache); + } + + return mrc_cache; +} + +static void update_mrc_cache(void *unused) +{ + printk(BIOS_DEBUG, "Updating MRC cache data.\n"); + struct mrc_data_container *current = cbmem_find(CBMEM_ID_MRCDATA); + struct mrc_data_container *cache, *cache_base; + u32 cache_size; + int ret; + + if (!current) { + printk(BIOS_ERR, "No MRC cache in cbmem. Can't update flash.\n"); + return; + } + if (current->mrc_data_size == -1) { + printk(BIOS_ERR, "MRC cache data in cbmem invalid.\n"); + return; + } + + cache_size = get_mrc_cache_region(&cache_base); + if (cache_base == NULL) { + printk(BIOS_ERR, "%s: could not find MRC cache area\n", + __func__); + return; + } + + /* + * we need to: + */ + // 0. compare MRC data to last mrc-cache block (exit if same) + cache = find_current_mrc_cache_local(cache_base, cache_size); + + if (cache && (cache->mrc_data_size == current->mrc_data_size) && + (memcmp(cache, current, cache->mrc_data_size) == 0)) { + printk(BIOS_DEBUG, + "MRC data in flash is up to date. No update.\n"); + return; + } + + // 1. use spi_flash_probe() to find the flash, then + spi_init(); + struct spi_flash *flash = spi_flash_probe(0, 0); + if (!flash) { + printk(BIOS_DEBUG, "Could not find SPI device\n"); + return; + } + + // 2. look up the first unused block + if (cache) + cache = find_next_mrc_cache(cache_base, cache, cache_size); + + /* + * 3. if no such place exists, erase entire mrc-cache range & use + * block 0. First time around the erase is not needed, but this is a + * small overhead for simpler code. + */ + if (!cache) { + printk(BIOS_DEBUG, + "Need to erase the MRC cache region of %d bytes at %p\n", + cache_size, cache_base); + + flash->erase(flash, to_flash_offset(flash, cache_base), cache_size); + + /* we will start at the beginning again */ + cache = cache_base; + } + // 4. write mrc data with flash->write() + printk(BIOS_DEBUG, "Finally: write MRC cache update to flash at %p\n", + cache); + ret = flash->write(flash, to_flash_offset(flash, cache), + current->mrc_data_size + sizeof(*current), current); + + if (ret) + printk(BIOS_WARNING, "Writing the MRC cache failed with ret %d\n", + ret); + else + printk(BIOS_DEBUG, "Successfully wrote MRC cache\n"); +} + +BOOT_STATE_INIT_ENTRY(BS_WRITE_TABLES, BS_ON_ENTRY, update_mrc_cache, NULL); + +struct mrc_data_container *find_current_mrc_cache(void) +{ + struct mrc_data_container *cache_base; + u32 cache_size; + + cache_size = get_mrc_cache_region(&cache_base); + if (cache_base == NULL) { + printk(BIOS_ERR, "%s: could not find MRC cache area\n", + __func__); + return NULL; + } + + /* + * we need to: + */ + // 0. compare MRC data to last mrc-cache block (exit if same) + return find_current_mrc_cache_local(cache_base, cache_size); +} |