google/rambi,intel/baytrail: Simplified romstage flow

Change-Id: I99440539d7b7586df66395776dcd0b4f72f66818
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34964
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rambi/romstage.c

@@ -55,21 +55,13 @@ static void *get_spd_pointer(char *spd_file_content, int total_spds, int *dual)
 	return &spd_file_content[SPD_SIZE * ram_id];
 }
 
-void mainboard_romstage_entry_rp(struct romstage_params *rp)
+void mainboard_fill_mrc_params(struct mrc_params *mp)
 {
 	void *spd_content;
 	int dual_channel = 0;
 	void *spd_file;
 	size_t spd_fsize;
 
-	struct mrc_params mp = {
-		.mainboard = {
-			.dram_type = DRAM_DDR3L,
-			.dram_info_location = DRAM_INFO_SPD_MEM,
-			.weaker_odt_settings = 1,
-		},
-	};
-
 	spd_file = cbfs_boot_map_with_leak("spd.bin", CBFS_TYPE_SPD,
 						&spd_fsize);
 	if (!spd_file)
@@ -77,10 +69,12 @@ void mainboard_romstage_entry_rp(struct romstage_params *rp)
 
 	spd_content = get_spd_pointer(spd_file, spd_fsize / SPD_SIZE,
 	                              &dual_channel);
-	mp.mainboard.dram_data[0] = spd_content;
-	if (dual_channel)
-		mp.mainboard.dram_data[1] = spd_content;
 
-	rp->mrc_params = ∓
-	romstage_common(rp);
+	mp->mainboard.dram_type = DRAM_DDR3L;
+	mp->mainboard.dram_info_location = DRAM_INFO_SPD_MEM,
+	mp->mainboard.weaker_odt_settings = 1,
+
+	mp->mainboard.dram_data[0] = spd_content;
+	if (dual_channel)
+		mp->mainboard.dram_data[1] = spd_content;
 }

src/soc/intel/baytrail/include/soc/romstage.h

@@ -24,12 +24,7 @@
 #include <arch/cpu.h>
 #include <soc/mrc_wrapper.h>
 
-struct romstage_params {
-	struct mrc_params *mrc_params;
-};
-
-void mainboard_romstage_entry_rp(struct romstage_params *params);
-void romstage_common(struct romstage_params *params);
+void mainboard_fill_mrc_params(struct mrc_params *mp);
 
 void raminit(struct mrc_params *mp, int prev_sleep_state);
 void gfx_init(void);

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

@@ -1,5 +1,7 @@
 cpu_incs-y += $(src)/cpu/intel/car/non-evict/cache_as_ram.S
 cpu_incs-y += $(obj)/fmap_config.h
+
+romstage-y += ../../../../cpu/intel/car/romstage.c
 romstage-y += romstage.c
 romstage-y += raminit.c
 romstage-$(CONFIG_ENABLE_BUILTIN_COM1) += uart.c

src/soc/intel/baytrail/romstage/romstage.c

@@ -14,21 +14,16 @@
  */
 
 #include <stddef.h>
-#include <arch/cpu.h>
 #include <arch/io.h>
 #include <arch/romstage.h>
 #include <device/mmio.h>
 #include <device/pci_ops.h>
-#include <bootblock_common.h>
 #include <console/console.h>
 #include <cbmem.h>
-#include <cpu/x86/mtrr.h>
-#include <cpu/x86/smm.h>
 #if CONFIG(EC_GOOGLE_CHROMEEC)
 #include <ec/google/chromeec/ec.h>
 #endif
 #include <elog.h>
-#include <program_loading.h>
 #include <romstage_handoff.h>
 #include <string.h>
 #include <timestamp.h>
@@ -156,28 +151,12 @@ static int chipset_prev_sleep_state(struct chipset_power_state *ps)
 	return prev_sleep_state;
 }
 
-/* The cache-as-ram assembly file calls romstage_main() after setting up
- * cache-as-ram.  romstage_main() will then call the mainboards's
- * mainboard_romstage_entry() function. That function then calls
- * romstage_common() below. The reason for the back and forth is to provide
- * common entry point from cache-as-ram while still allowing for code sharing.
- * Because we can't use global variables the stack is used for allocations --
- * thus the need to call back and forth. */
-
-static struct postcar_frame early_mtrrs;
-
-/* Entry from cache-as-ram.inc. */
-static void romstage_main(uint64_t tsc)
+/* Entry from cpu/intel/car/romstage.c */
+void mainboard_romstage_entry(void)
 {
-	struct romstage_params rp = {
-		.mrc_params = NULL,
-	};
-
-	/* Save initial timestamp from bootblock. */
-	timestamp_init(tsc);
-
-	/* Save romstage begin */
-	timestamp_add_now(TS_START_ROMSTAGE);
+	struct chipset_power_state *ps;
+	int prev_sleep_state;
+	struct mrc_params mp;
 
 	program_base_addresses();
 
@@ -196,21 +175,8 @@ static void romstage_main(uint64_t tsc)
 
 	gfx_init();
 
-	/* Call into mainboard. */
-	mainboard_romstage_entry_rp(&rp);
-
-	if (CONFIG(SMM_TSEG))
-		smm_list_regions();
-
-	prepare_and_run_postcar(&early_mtrrs);
-	/* We do not return here. */
-}
-
-/* Entry from the mainboard. */
-void romstage_common(struct romstage_params *params)
-{
-	struct chipset_power_state *ps;
-	int prev_sleep_state;
+	memset(&mp, 0, sizeof(mp));
+	mainboard_fill_mrc_params(&mp);
 
 	timestamp_add_now(TS_BEFORE_INITRAM);
 
@@ -224,19 +190,10 @@ void romstage_common(struct romstage_params *params)
 		boot_count_increment();
 #endif
 
-
 	/* Initialize RAM */
-	raminit(params->mrc_params, prev_sleep_state);
+	raminit(&mp, prev_sleep_state);
 
 	timestamp_add_now(TS_AFTER_INITRAM);
 
 	romstage_handoff_init(prev_sleep_state == ACPI_S3);
 }
-
-/* This wrapper enables easy transition towards C_ENVIRONMENT_BOOTBLOCK,
- * keeping changes in cache_as_ram.S easy to manage.
- */
-asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
-{
-	romstage_main(base_timestamp);
-}