fsp2_0: implement stage cache for silicon init

Stage cache will save ~20ms on S3 resume for apollolake platforms.
Implementing the cache in ramstage to save silicon init and reload
it on resume. This patch adds passing S3 status to silicon init in
order to verify that the wake is from S3 and not for some other
reason. This patch also includes changes needed for quark and
skylake platforms that require fsp 2.0.

BUG=chrome-os-partner:56941
BRANCH=none
TEST=built for reef and tested boot and S3 resume path saving 20ms

Change-Id: I99dc93c1d7a7d5cf8d8de1aa253a326ec67f05f6
Signed-off-by: Brandon Breitenstein <brandon.breitenstein@intel.com>
Reviewed-on: https://review.coreboot.org/17460
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 18 insertions, 2 deletions

diff --git a/src/drivers/intel/fsp2_0/include/fsp/api.h b/src/drivers/intel/fsp2_0/include/fsp/api.h
index 553fc52d01..b0120400c2 100644
--- a/src/drivers/intel/fsp2_0/include/fsp/api.h
+++ b/src/drivers/intel/fsp2_0/include/fsp/api.h
@@ -38,7 +38,7 @@ enum fsp_notify_phase {
 
 /* Main FSP stages */
 void fsp_memory_init(bool s3wake);
-void fsp_silicon_init(void);
+void fsp_silicon_init(bool s3wake);
 
 /* Callbacks for updating stage-specific parameters */
 void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd);
diff --git a/src/drivers/intel/fsp2_0/silicon_init.c b/src/drivers/intel/fsp2_0/silicon_init.c
index b911553c2f..e6464aa3df 100644
--- a/src/drivers/intel/fsp2_0/silicon_init.c
+++ b/src/drivers/intel/fsp2_0/silicon_init.c
@@ -18,6 +18,7 @@
 #include <fsp/api.h>
 #include <fsp/util.h>
 #include <program_loading.h>
+#include <stage_cache.h>
 #include <string.h>
 #include <timestamp.h>
 
@@ -61,7 +62,7 @@ static void do_silicon_init(struct fsp_header *hdr)
 	}
 }
 
-void fsp_silicon_init(void)
+void fsp_silicon_init(bool s3wake)
 {
 	struct fsp_header *hdr = &fsps_hdr;
 	struct cbfsf file_desc;
@@ -69,6 +70,17 @@ void fsp_silicon_init(void)
 	const char *name = CONFIG_FSP_S_CBFS;
 	void *dest;
 	size_t size;
+	struct prog fsps = PROG_INIT(PROG_REFCODE, name);
+
+	if (s3wake && !IS_ENABLED(CONFIG_NO_STAGE_CACHE)) {
+		printk(BIOS_DEBUG, "Loading FSPS from stage_cache\n");
+		stage_cache_load_stage(STAGE_REFCODE, &fsps);
+		if (fsp_validate_component(hdr, prog_rdev(&fsps)) != CB_SUCCESS)
+			die("On resume fsps header is invalid\n");
+		do_silicon_init(hdr);
+		return;
+	}
+
 
 	if (cbfs_boot_locate(&file_desc, name, NULL)) {
 		printk(BIOS_ERR, "Could not locate %s in CBFS\n", name);
@@ -98,6 +110,10 @@ void fsp_silicon_init(void)
 	if (fsp_validate_component(hdr, &rdev) != CB_SUCCESS)
 		die("Invalid FSPS header!\n");
 
+	prog_set_area(&fsps, dest, size);
+
+	stage_cache_add(STAGE_REFCODE, &fsps);
+
 	/* Signal that FSP component has been loaded. */
 	prog_segment_loaded(hdr->image_base, hdr->image_size, SEG_FINAL);