driver/intel/fsp1_1: Fix boot failure for non-verstage case

Currently car_stage_entry is defined only in romstage_after_verstage and
as a result when SEPARATE_VERSTAGE is not selected, there is no
entry point into romstage and romstage will not be started at all.

The solution is move out romstage_after_verstage.S from fsp1.1 driver
to skylake/romstage. And add CONFIG_PLATFORM_USES_FSP1_1 to fix the
build and boot issue with this change.

Besides that, rename the romstage_after_verstage to romstage_c_entry
in more appropriate naming convention after this fix.

Tested on SkyLake Saddle Brook (FSP 1.1) and KabyLake Rvp11 (FSP 2.0),
romstage can be started successfully.

Change-Id: I1cd2cf5655fdff6e23b7b76c3974e7dfd3835efd
Signed-off-by: Teo Boon Tiong <boon.tiong.teo@intel.com>
Reviewed-on: https://review.coreboot.org/17976
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/drivers/intel/fsp1_1/Makefile.inc

@@ -28,7 +28,6 @@ romstage-y += fsp_util.c
 romstage-y += hob.c
 romstage-y += raminit.c
 romstage-y += romstage.c
-romstage-$(CONFIG_SEPARATE_VERSTAGE) += romstage_after_verstage.S
 romstage-y += stack.c
 romstage-y += stage_cache.c
 romstage-$(CONFIG_MMA) += mma_core.c

src/drivers/intel/fsp1_1/car.c

@@ -68,7 +68,7 @@ asmlinkage void *cache_as_ram_main(struct cache_as_ram_params *car_params)
 }
 
 /* Entry point taken when romstage is called after a separate verstage. */
-asmlinkage void *romstage_after_verstage(void)
+asmlinkage void *romstage_c_entry(void)
 {
 	/* Need to locate the current FSP_INFO_HEADER. The cache-as-ram
 	 * is still enabled. We can directly access work buffer here. */

src/drivers/intel/fsp1_1/include/fsp/car.h

@@ -32,7 +32,7 @@ struct cache_as_ram_params {
 /* Entry points from the cache-as-ram assembly code. */
 asmlinkage void *cache_as_ram_main(struct cache_as_ram_params *car_params);
 asmlinkage void after_cache_as_ram(void *chipset_context);
-asmlinkage void *romstage_after_verstage(void);
+asmlinkage void *romstage_c_entry(void);
 /* Per stage calls from the above two functions. The void * return from
  * cache_as_ram_stage_main() is the stack pointer to use in RAM after
  * exiting cache-as-ram mode. */

src/soc/intel/skylake/romstage/Makefile.inc

@@ -1,5 +1,6 @@
 verstage-y += power_state.c
 
+romstage-$(CONFIG_PLATFORM_USES_FSP1_1) += car_stage.S
 romstage-$(CONFIG_PLATFORM_USES_FSP2_0) += car_stage_fsp20.S
 romstage-y += pmc.c
 romstage-y += power_state.c

src/soc/intel/skylake/romstage/car_stage.S

@@ -13,13 +13,15 @@
  * GNU General Public License for more details.
  */
 
-#define LHLT_DELAY	0x50000		/* I/O delay between post codes on failure */
+/* I/O delay between post codes on failure */
+#define LHLT_DELAY	0x50000
 
 .text
 .global car_stage_entry
 car_stage_entry:
-	call	romstage_after_verstage
-	#include "after_raminit.S"
+	call	romstage_c_entry
+	#include "src/drivers/intel/fsp1_1/after_raminit.S"
+
 
 	movb	$0x69, %ah
 	jmp	.Lhlt