haswell platforms: restructure romstage main

There was a mix of setup code sprinkled across the various components:
southbridge code in the northbridge, etc. This commit reorganizes the
code so that northbridge code doesn't initialize southbridge components.
Additionally, the calling dram initialization no longer calls out to ME
code. The main() function in the mainboard calls the necessary ME
functions before and after dram initialization.

The biggest change is the addition of an early_pch_init() function
which initializes the BARs, GPIOs, and RCBA configuration. It is also
responsible for reporting back to the caller if the board is being
woken up from S3. The one sequence difference is that the RCBA config
is performed before claling the reference code.

Lastly the rcba configuration was changed to be table driven so that
different board/configurations can use the same code. It should be
possible to have board/configuration specific gpio and rcba
configuration while reusing the romstage code.

Change-Id: I830e41b426261dd686a2701ce054fc39f296dffa
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2681
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 5 insertions, 12 deletions

diff --git a/src/northbridge/intel/haswell/raminit.c b/src/northbridge/intel/haswell/raminit.c
index 0c68e60707..e2b085b3fd 100644
--- a/src/northbridge/intel/haswell/raminit.c
+++ b/src/northbridge/intel/haswell/raminit.c
@@ -32,8 +32,6 @@
 #include "pei_data.h"
 #include "haswell.h"
 
-/* Management Engine is in the southbridge */
-#include "southbridge/intel/lynxpoint/me.h"
 #if CONFIG_CHROMEOS
 #include <vendorcode/google/chromeos/chromeos.h>
 #else
@@ -152,12 +150,6 @@ void sdram_initialize(struct pei_data *pei_data)
 	struct sys_info sysinfo;
 	unsigned long entry;
 
-	report_platform_info();
-
-	/* Wait for ME to be ready */
-	intel_early_me_init();
-	intel_early_me_uma_size();
-
 	printk(BIOS_DEBUG, "Starting UEFI PEI System Agent\n");
 
 	memset(&sysinfo, 0, sizeof(sysinfo));
@@ -216,8 +208,6 @@ void sdram_initialize(struct pei_data *pei_data)
 		version >> 24 , (version >> 16) & 0xff,
 		(version >> 8) & 0xff, version & 0xff);
 
-	intel_early_me_status();
-
 	report_memory_config();
 
 	/* S3 resume: don't save scrambler seed or MRC data */
@@ -232,7 +222,10 @@ struct cbmem_entry *get_cbmem_toc(void)
 
 unsigned long get_top_of_ram(void)
 {
-	/* Base of TSEG is top of usable DRAM */
+	/*
+	 * Base of TSEG is top of usable DRAM below 4GiB. The register has
+	 * 1 MiB alignement.
+	 */
 	u32 tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
-	return (unsigned long) tom;
+	return (unsigned long) tom & ~((1 << 20) - 1);
 }