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baytrail: Add function to read top of low memory 

The top of low memory is also the start of the region where
PCIe resources are allocated.  This needs to be passed in
ACPI but is only readable from IOSF.

BUG=chrome-os-partner:23505
BRANCH=rambi
TEST=build and boot on rambi

Change-Id: Iad95335f72dc3e35b837bedb8d52d388c861a330
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175625
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4935
Tested-by: build bot (Jenkins)
This commit is contained in:
Duncan Laurie 2013-11-04 17:02:45 -08:00 committed by Aaron Durbin
parent 7fbe20bd2c
commit 1f52f51f4e
2 changed files with 12 additions and 1 deletions
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5
src/soc/intel/baytrail/baytrail/iomap.h
View File

@ -79,4 +79,9 @@
#define SMBUS_BASE_ADDRESS 0xefa0
#ifndef __ACPI__
/* Read Top of Low Memory (BMBOUND) */
uint32_t nc_read_top_of_low_memory(void);
#endif
#endif /* _BAYTRAIL_IOMAP_H_ */

8
src/soc/intel/baytrail/northcluster.c
View File

@ -23,6 +23,7 @@
#include <device/pci.h>
#include <device/pci_ids.h>
#include <baytrail/iomap.h>
#include <baytrail/iosf.h>
#include <baytrail/pci_devs.h>
#include <baytrail/ramstage.h>
@ -64,6 +65,11 @@
*/
#define RES_IN_KiB(r) ((r) >> 10)
uint32_t nc_read_top_of_low_memory(void)
{
return iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
}
static void nc_read_resources(device_t dev)
{
unsigned long mmconf;
@ -107,7 +113,7 @@ static void nc_read_resources(device_t dev)
reserved_ram_resource(dev, index++, smmrrl, smmrrh - smmrrl);
/* All address space between bmbound and smmrrh is unusable. */
bmbound = RES_IN_KiB(iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1));
bmbound = RES_IN_KiB(nc_read_top_of_low_memory());
mmio_resource(dev, index++, smmrrh, bmbound - smmrrh);
/* The BMBOUND_HI register matches register bits of 31:24 with address