AGESA: Reduce SPI use by 24kB for S3 support

There is no need to backup VolatileStorage in SPI flash at all.
At the time we need it, we have CBMEM available.

Change-Id: If0ca57b314140a833d6d59fe9e236e07816f05a4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/10318
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>

2 files changed, 8 insertions, 25 deletions

diff --git a/src/cpu/amd/agesa/heapmanager.c b/src/cpu/amd/agesa/heapmanager.c
index 52a4e502b0..eeff0a408d 100644
--- a/src/cpu/amd/agesa/heapmanager.c
+++ b/src/cpu/amd/agesa/heapmanager.c
@@ -49,7 +49,6 @@ void EmptyHeap(void)
 void ResumeHeap(void **heap, size_t *len)
 {
 	void *base = GetHeapBase();
-	memset(base, 0, BIOS_HEAP_SIZE);
 	*heap = base;
 	*len = BIOS_HEAP_SIZE;
 }
diff --git a/src/northbridge/amd/agesa/oem_s3.c b/src/northbridge/amd/agesa/oem_s3.c
index 16426bc518..dfc1ebc936 100644
--- a/src/northbridge/amd/agesa/oem_s3.c
+++ b/src/northbridge/amd/agesa/oem_s3.c
@@ -27,17 +27,15 @@
 
 typedef enum {
 	S3DataTypeNonVolatile=0,	///< NonVolatile Data Type
-	S3DataTypeVolatile,		///< Volatile Data Type
 	S3DataTypeMTRR			///< MTRR storage
 } S3_DATA_TYPE;
 
 /* The size needs to be 4k aligned, which is the sector size of most flashes. */
-#define S3_DATA_VOLATILE_SIZE		0x6000
 #define S3_DATA_MTRR_SIZE			0x1000
 #define S3_DATA_NONVOLATILE_SIZE	0x1000
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
-	(S3_DATA_VOLATILE_SIZE + S3_DATA_MTRR_SIZE + S3_DATA_NONVOLATILE_SIZE) > CONFIG_S3_DATA_SIZE
+	(S3_DATA_MTRR_SIZE + S3_DATA_NONVOLATILE_SIZE) > CONFIG_S3_DATA_SIZE
 #error "Please increase the value of S3_DATA_SIZE"
 #endif
 
@@ -47,16 +45,12 @@ static void get_s3nv_data(S3_DATA_TYPE S3DataType, u32 *pos, u32 *len)
 	u32 s3_data = CONFIG_S3_DATA_POS;
 
 	switch (S3DataType) {
-	case S3DataTypeVolatile:
-		*pos = s3_data;
-		*len = S3_DATA_VOLATILE_SIZE;
-		break;
 	case S3DataTypeMTRR:
-		*pos = s3_data + S3_DATA_VOLATILE_SIZE;
+		*pos = s3_data;
 		*len = S3_DATA_MTRR_SIZE;
 		break;
 	case S3DataTypeNonVolatile:
-		*pos = s3_data + S3_DATA_VOLATILE_SIZE + S3_DATA_MTRR_SIZE;
+		*pos = s3_data + S3_DATA_MTRR_SIZE;
 		*len = S3_DATA_NONVOLATILE_SIZE;
 		break;
 	default:
@@ -84,21 +78,13 @@ AGESA_STATUS OemInitResume(AMD_RESUME_PARAMS *ResumeParams)
 AGESA_STATUS OemS3LateRestore(AMD_S3LATE_PARAMS *S3LateParams)
 {
 	AMD_S3_PARAMS *dataBlock = &S3LateParams->S3DataBlock;
-	u32 pos, size;
 	void *dst;
 	size_t len;
 
-	/* TODO: Named volatile, do we need to save it over S3? */
-	get_s3nv_data(S3DataTypeVolatile, &pos, &size);
-	void *src = (void *) (pos + sizeof(UINT32));
-
 	ResumeHeap(&dst, &len);
 	dataBlock->VolatileStorageSize = len;
 	dataBlock->VolatileStorage = dst;
 
-	len = *(UINT32 *) pos;
-	memcpy(dst, src, len);
-
 	return AGESA_SUCCESS;
 }
 
@@ -139,9 +125,6 @@ AGESA_STATUS OemS3Save(AMD_S3SAVE_PARAMS *S3SaveParams)
 	if (HIGH_ROMSTAGE_STACK_SIZE)
 		cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, HIGH_ROMSTAGE_STACK_SIZE);
 
-	if (HIGH_MEMORY_SCRATCH)
-		cbmem_add(CBMEM_ID_RESUME_SCRATCH, HIGH_MEMORY_SCRATCH);
-
 	/* To be consumed in AmdInitResume. */
 	get_s3nv_data(S3DataTypeNonVolatile, &pos, &size);
 	if (size && dataBlock->NvStorageSize)
@@ -149,10 +132,11 @@ AGESA_STATUS OemS3Save(AMD_S3SAVE_PARAMS *S3SaveParams)
 			dataBlock->NvStorageSize);
 
 	/* To be consumed in AmdS3LateRestore. */
-	get_s3nv_data(S3DataTypeVolatile, &pos, &size);
-	if (size && dataBlock->VolatileStorageSize)
-		spi_SaveS3info(pos, size, dataBlock->VolatileStorage,
-			dataBlock->VolatileStorageSize);
+	char *heap = cbmem_add(CBMEM_ID_RESUME_SCRATCH, HIGH_MEMORY_SCRATCH);
+	if (heap) {
+		memset(heap, 0, HIGH_MEMORY_SCRATCH);
+		memcpy(heap, dataBlock->VolatileStorage, dataBlock->VolatileStorageSize);
+	}
 
 	/* Collect MTRR setup. */
 	backup_mtrr(MTRRStorage, &MTRRStorageSize);