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-rw-r--r--arch/x86/include/asm/arch-ivybridge/mrccache.h51
-rw-r--r--arch/x86/include/asm/global_data.h3
2 files changed, 54 insertions, 0 deletions
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 0000000000..968b2eff9e
--- /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 243ed5c461..5ee06eb70d 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