diff options
| -rw-r--r-- | arch/x86/cpu/ivybridge/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/cpu/ivybridge/mrccache.c | 156 | ||||
| -rw-r--r-- | arch/x86/cpu/ivybridge/sdram.c | 253 | ||||
| -rw-r--r-- | arch/x86/include/asm/arch-ivybridge/mrccache.h | 51 | ||||
| -rw-r--r-- | arch/x86/include/asm/global_data.h | 3 |
5 files changed, 464 insertions, 0 deletions
diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile index 0c7efae..3576b83 100644 --- a/arch/x86/cpu/ivybridge/Makefile +++ b/arch/x86/cpu/ivybridge/Makefile @@ -14,6 +14,7 @@ obj-y += lpc.o obj-y += me_status.o obj-y += model_206ax.o obj-y += microcode_intel.o +obj-y += mrccache.o obj-y += northbridge.o obj-y += pch.o obj-y += pci.o diff --git a/arch/x86/cpu/ivybridge/mrccache.c b/arch/x86/cpu/ivybridge/mrccache.c new file mode 100644 index 0000000..0f1a64b --- /dev/null +++ b/arch/x86/cpu/ivybridge/mrccache.c @@ -0,0 +1,156 @@ +/* + * From Coreboot src/southbridge/intel/bd82x6x/mrccache.c + * + * Copyright (C) 2014 Google Inc. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <errno.h> +#include <fdtdec.h> +#include <net.h> +#include <spi.h> +#include <spi_flash.h> +#include <asm/arch/mrccache.h> +#include <asm/arch/sandybridge.h> + +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->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 *cache) +{ + return cache && (cache->signature == MRC_DATA_SIGNATURE); +} + +/* + * Find the largest index block in the MRC cache. Return NULL if none is + * found. + */ +struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry) +{ + struct mrc_data_container *cache, *next; + ulong base_addr, end_addr; + uint id; + + base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + entry->offset; + end_addr = base_addr + entry->length; + cache = NULL; + + /* Search for the last filled entry in the region */ + for (id = 0, next = (struct mrc_data_container *)base_addr; + is_mrc_cache(next); + id++) { + cache = next; + next = next_mrc_block(next); + if ((ulong)next >= end_addr) + break; + } + + if (id-- == 0) { + debug("%s: No valid MRC cache found.\n", __func__); + return NULL; + } + + /* Verify checksum */ + if (cache->checksum != compute_ip_checksum(cache->data, + cache->data_size)) { + printf("%s: MRC cache checksum mismatch\n", __func__); + return NULL; + } + + debug("%s: picked entry %u from cache block\n", __func__, id); + + return cache; +} + +/** + * find_next_mrc_cache() - get next cache entry + * + * @entry: MRC cache flash area + * @cache: Entry to start from + * + * @return next cache entry if found, NULL if we got to the end + */ +static struct mrc_data_container *find_next_mrc_cache(struct fmap_entry *entry, + struct mrc_data_container *cache) +{ + ulong base_addr, end_addr; + + base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + entry->offset; + end_addr = base_addr + entry->length; + + cache = next_mrc_block(cache); + if ((ulong)cache >= end_addr) { + /* Crossed the boundary */ + cache = NULL; + debug("%s: no available entries found\n", __func__); + } else { + debug("%s: picked next entry from cache block at %p\n", + __func__, cache); + } + + return cache; +} + +int mrccache_update(struct spi_flash *sf, struct fmap_entry *entry, + struct mrc_data_container *cur) +{ + struct mrc_data_container *cache; + ulong offset; + ulong base_addr; + int ret; + + /* Find the last used block */ + base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + entry->offset; + debug("Updating MRC cache data\n"); + cache = mrccache_find_current(entry); + if (cache && (cache->data_size == cur->data_size) && + (!memcmp(cache, cur, cache->data_size + sizeof(*cur)))) { + debug("MRC data in flash is up to date. No update\n"); + return -EEXIST; + } + + /* Move to the next block, which will be the first unused block */ + if (cache) + cache = find_next_mrc_cache(entry, cache); + + /* + * If we have got to the end, erase the entire mrc-cache area and start + * again at block 0. + */ + if (!cache) { + debug("Erasing the MRC cache region of %x bytes at %x\n", + entry->length, entry->offset); + + ret = spi_flash_erase(sf, entry->offset, entry->length); + if (ret) { + debug("Failed to erase flash region\n"); + return ret; + } + cache = (struct mrc_data_container *)base_addr; + } + + /* Write the data out */ + offset = (ulong)cache - base_addr + entry->offset; + debug("Write MRC cache update to flash at %lx\n", offset); + ret = spi_flash_write(sf, offset, cur->data_size + sizeof(*cur), cur); + if (ret) { + debug("Failed to write to SPI flash\n"); + return ret; + } + + return 0; +} diff --git a/arch/x86/cpu/ivybridge/sdram.c b/arch/x86/cpu/ivybridge/sdram.c index 9504735..4963448 100644 --- a/arch/x86/cpu/ivybridge/sdram.c +++ b/arch/x86/cpu/ivybridge/sdram.c @@ -14,12 +14,17 @@ #include <errno.h> #include <fdtdec.h> #include <malloc.h> +#include <net.h> +#include <rtc.h> +#include <spi.h> +#include <spi_flash.h> #include <asm/processor.h> #include <asm/gpio.h> #include <asm/global_data.h> #include <asm/mtrr.h> #include <asm/pci.h> #include <asm/arch/me.h> +#include <asm/arch/mrccache.h> #include <asm/arch/pei_data.h> #include <asm/arch/pch.h> #include <asm/post.h> @@ -27,6 +32,10 @@ DECLARE_GLOBAL_DATA_PTR; +#define CMOS_OFFSET_MRC_SEED 152 +#define CMOS_OFFSET_MRC_SEED_S3 156 +#define CMOS_OFFSET_MRC_SEED_CHK 160 + /* * This function looks for the highest region of memory lower than 4GB which * has enough space for U-Boot where U-Boot is aligned on a page boundary. @@ -80,6 +89,202 @@ void dram_init_banksize(void) } } +static int get_mrc_entry(struct spi_flash **sfp, struct fmap_entry *entry) +{ + const void *blob = gd->fdt_blob; + int node, spi_node, mrc_node; + int upto; + + /* Find the flash chip within the SPI controller node */ + upto = 0; + spi_node = fdtdec_next_alias(blob, "spi", COMPAT_INTEL_ICH_SPI, &upto); + if (spi_node < 0) + return -ENOENT; + node = fdt_first_subnode(blob, spi_node); + if (node < 0) + return -ECHILD; + + /* Find the place where we put the MRC cache */ + mrc_node = fdt_subnode_offset(blob, node, "rw-mrc-cache"); + if (mrc_node < 0) + return -EPERM; + + if (fdtdec_read_fmap_entry(blob, mrc_node, "rm-mrc-cache", entry)) + return -EINVAL; + + if (sfp) { + *sfp = spi_flash_probe_fdt(blob, node, spi_node); + if (!*sfp) + return -EBADF; + } + + return 0; +} + +static int read_seed_from_cmos(struct pei_data *pei_data) +{ + u16 c1, c2, checksum, seed_checksum; + + /* + * Read scrambler seeds from CMOS RAM. We don't want to store them in + * SPI flash since they change on every boot and that would wear down + * the flash too much. So we store these in CMOS and the large MRC + * data in SPI flash. + */ + pei_data->scrambler_seed = rtc_read32(CMOS_OFFSET_MRC_SEED); + debug("Read scrambler seed 0x%08x from CMOS 0x%02x\n", + pei_data->scrambler_seed, CMOS_OFFSET_MRC_SEED); + + pei_data->scrambler_seed_s3 = rtc_read32(CMOS_OFFSET_MRC_SEED_S3); + debug("Read S3 scrambler seed 0x%08x from CMOS 0x%02x\n", + pei_data->scrambler_seed_s3, CMOS_OFFSET_MRC_SEED_S3); + + /* Compute seed checksum and compare */ + c1 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed, + sizeof(u32)); + c2 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed_s3, + sizeof(u32)); + checksum = add_ip_checksums(sizeof(u32), c1, c2); + + seed_checksum = rtc_read8(CMOS_OFFSET_MRC_SEED_CHK); + seed_checksum |= rtc_read8(CMOS_OFFSET_MRC_SEED_CHK + 1) << 8; + + if (checksum != seed_checksum) { + debug("%s: invalid seed checksum\n", __func__); + pei_data->scrambler_seed = 0; + pei_data->scrambler_seed_s3 = 0; + return -EINVAL; + } + + return 0; +} + +static int prepare_mrc_cache(struct pei_data *pei_data) +{ + struct mrc_data_container *mrc_cache; + struct fmap_entry entry; + int ret; + + ret = read_seed_from_cmos(pei_data); + if (ret) + return ret; + ret = get_mrc_entry(NULL, &entry); + if (ret) + return ret; + mrc_cache = mrccache_find_current(&entry); + if (!mrc_cache) + return -ENOENT; + + /* + * TODO(sjg@chromium.org): Skip this for now as it causes boot + * problems + */ + if (0) { + pei_data->mrc_input = mrc_cache->data; + pei_data->mrc_input_len = mrc_cache->data_size; + } + debug("%s: at %p, size %x checksum %04x\n", __func__, + pei_data->mrc_input, pei_data->mrc_input_len, + mrc_cache->checksum); + + return 0; +} + +static int build_mrc_data(struct mrc_data_container **datap) +{ + struct mrc_data_container *data; + int orig_len; + int output_len; + + orig_len = gd->arch.mrc_output_len; + output_len = ALIGN(orig_len, 16); + data = malloc(output_len + sizeof(*data)); + if (!data) + return -ENOMEM; + data->signature = MRC_DATA_SIGNATURE; + data->data_size = output_len; + data->reserved = 0; + memcpy(data->data, gd->arch.mrc_output, orig_len); + + /* Zero the unused space in aligned buffer. */ + if (output_len > orig_len) + memset(data->data + orig_len, 0, output_len - orig_len); + + data->checksum = compute_ip_checksum(data->data, output_len); + *datap = data; + + return 0; +} + +static int write_seeds_to_cmos(struct pei_data *pei_data) +{ + u16 c1, c2, checksum; + + /* Save the MRC seed values to CMOS */ + rtc_write32(CMOS_OFFSET_MRC_SEED, pei_data->scrambler_seed); + debug("Save scrambler seed 0x%08x to CMOS 0x%02x\n", + pei_data->scrambler_seed, CMOS_OFFSET_MRC_SEED); + + rtc_write32(CMOS_OFFSET_MRC_SEED_S3, pei_data->scrambler_seed_s3); + debug("Save s3 scrambler seed 0x%08x to CMOS 0x%02x\n", + pei_data->scrambler_seed_s3, CMOS_OFFSET_MRC_SEED_S3); + + /* Save a simple checksum of the seed values */ + c1 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed, + sizeof(u32)); + c2 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed_s3, + sizeof(u32)); + checksum = add_ip_checksums(sizeof(u32), c1, c2); + + rtc_write8(CMOS_OFFSET_MRC_SEED_CHK, checksum & 0xff); + rtc_write8(CMOS_OFFSET_MRC_SEED_CHK + 1, (checksum >> 8) & 0xff); + + return 0; +} + +static int sdram_save_mrc_data(void) +{ + struct mrc_data_container *data; + struct fmap_entry entry; + struct spi_flash *sf; + int ret; + + if (!gd->arch.mrc_output_len) + return 0; + debug("Saving %d bytes of MRC output data to SPI flash\n", + gd->arch.mrc_output_len); + + ret = get_mrc_entry(&sf, &entry); + if (ret) + goto err_entry; + ret = build_mrc_data(&data); + if (ret) + goto err_data; + ret = mrccache_update(sf, &entry, data); + if (!ret) + debug("Saved MRC data with checksum %04x\n", data->checksum); + + free(data); +err_data: + spi_flash_free(sf); +err_entry: + if (ret) + debug("%s: Failed: %d\n", __func__, ret); + return ret; +} + +/* Use this hook to save our SDRAM parameters */ +int misc_init_r(void) +{ + int ret; + + ret = sdram_save_mrc_data(); + if (ret) + printf("Unable to save MRC data: %d\n", ret); + + return 0; +} + static const char *const ecc_decoder[] = { "inactive", "active on IO", @@ -142,6 +347,11 @@ static asmlinkage void console_tx_byte(unsigned char byte) #endif } +static int recovery_mode_enabled(void) +{ + return false; +} + /** * Find the PEI executable in the ROM and execute it. * @@ -166,6 +376,17 @@ int sdram_initialise(struct pei_data *pei_data) debug("Starting UEFI PEI System Agent\n"); + /* + * Do not pass MRC data in for recovery mode boot, + * Always pass it in for S3 resume. + */ + if (!recovery_mode_enabled() || + pei_data->boot_mode == PEI_BOOT_RESUME) { + ret = prepare_mrc_cache(pei_data); + if (ret) + debug("prepare_mrc_cache failed: %d\n", ret); + } + /* If MRC data is not found we cannot continue S3 resume. */ if (pei_data->boot_mode == PEI_BOOT_RESUME && !pei_data->mrc_input) { debug("Giving up in sdram_initialize: No MRC data\n"); @@ -216,6 +437,8 @@ int sdram_initialise(struct pei_data *pei_data) debug("System Agent Version %d.%d.%d Build %d\n", version >> 24 , (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff); + debug("MCR output data length %#x at %p\n", pei_data->mrc_output_len, + pei_data->mrc_output); /* * Send ME init done for SandyBridge here. This is done inside the @@ -231,6 +454,36 @@ int sdram_initialise(struct pei_data *pei_data) post_system_agent_init(pei_data); report_memory_config(); + /* S3 resume: don't save scrambler seed or MRC data */ + if (pei_data->boot_mode != PEI_BOOT_RESUME) { + /* + * This will be copied to SDRAM in reserve_arch(), then written + * to SPI flash in sdram_save_mrc_data() + */ + gd->arch.mrc_output = (char *)pei_data->mrc_output; + gd->arch.mrc_output_len = pei_data->mrc_output_len; + ret = write_seeds_to_cmos(pei_data); + if (ret) + debug("Failed to write seeds to CMOS: %d\n", ret); + } + + return 0; +} + +int reserve_arch(void) +{ + u16 checksum; + + checksum = compute_ip_checksum(gd->arch.mrc_output, + gd->arch.mrc_output_len); + debug("Saving %d bytes for MRC output data, checksum %04x\n", + gd->arch.mrc_output_len, checksum); + gd->start_addr_sp -= gd->arch.mrc_output_len; + memcpy((void *)gd->start_addr_sp, gd->arch.mrc_output, + gd->arch.mrc_output_len); + gd->arch.mrc_output = (char *)gd->start_addr_sp; + gd->start_addr_sp &= ~0xf; + return 0; } diff --git a/arch/x86/include/asm/arch-ivybridge/mrccache.h b/arch/x86/include/asm/arch-ivybridge/mrccache.h new file mode 100644 index 0000000..968b2ef --- /dev/null +++ b/arch/x86/include/asm/arch-ivybridge/mrccache.h @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2014 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_ARCH_MRCCACHE_H +#define _ASM_ARCH_MRCCACHE_H + +#define MRC_DATA_ALIGN 0x1000 +#define MRC_DATA_SIGNATURE (('M' << 0) | ('R' << 8) | ('C' << 16) | \ + ('D'<<24)) + +__packed struct mrc_data_container { + u32 signature; /* "MRCD" */ + u32 data_size; /* Size of the 'data' field */ + u32 checksum; /* IP style checksum */ + u32 reserved; /* For header alignment */ + u8 data[0]; /* Variable size, platform/run time dependent */ +}; + +struct fmap_entry; +struct spi_flash; + +/** + * mrccache_find_current() - find the latest MRC cache record + * + * This searches the MRC cache region looking for the latest record to use + * for setting up SDRAM + * + * @entry: Information about the position and size of the MRC cache + * @return pointer to latest record, or NULL if none + */ +struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry); + +/** + * mrccache_update() - update the MRC cache with a new record + * + * This writes a new record to the end of the MRC cache. If the new record is + * the same as the latest record then the write is skipped + * + * @sf: SPI flash to write to + * @entry: Position and size of MRC cache in SPI flash + * @cur: Record to write + * @return 0 if updated, -EEXIST if the record is the same as the latest + * record, other error if SPI write failed + */ +int mrccache_update(struct spi_flash *sf, struct fmap_entry *entry, + struct mrc_data_container *cur); + +#endif diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index 243ed5c..5ee06eb 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -65,6 +65,9 @@ struct arch_global_data { struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS]; int mtrr_req_count; int has_mtrr; + /* MRC training data to save for the next boot */ + char *mrc_output; + unsigned int mrc_output_len; }; #endif |