[coreboot-gerrit] Change in coreboot[master]: soc/mediatek/mt8195: Reserve memory to store PCIe timestamp

[Jianjun Wang (Code Review)]

Attention is currently required from: Hung-Te Lin.
Jianjun Wang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/62934 )

Change subject: soc/mediatek/mt8195: Reserve memory to store PCIe timestamp
......................................................................

soc/mediatek/mt8195: Reserve memory to store PCIe timestamp

Reserve 8 byte space from SRAM to store the timestamp of PCIe.

TEST=Build pass and boot up to kernel successfully via SSD on Dojo
board, here is the SSD information in boot log:
 == NVME IDENTIFY CONTROLLER DATA ==
    PCI VID   : 0x15b7
    PCI SSVID : 0x15b7
    SN        : 21517J440114
    MN        : WDC PC SN530 SDBPTPZ-256G-1006
    RAB       : 0x4
    AERL      : 0x7
    SQES      : 0x66
    CQES      : 0x44
    NN        : 0x1
Identified NVMe model WDC PC SN530 SDBPTPZ-256G-1006

BUG=b:178565024

Signed-off-by: Jianjun Wang 
Change-Id: Ia97468742e144d8343f5c7ae6db7cb82a316cf5c
---
M src/soc/mediatek/mt8195/include/soc/memlayout.ld
M src/soc/mediatek/mt8195/include/soc/symbols.h
2 files changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/62934/1

diff --git a/src/soc/mediatek/mt8195/include/soc/memlayout.ld b/src/soc/mediatek/mt8195/include/soc/memlayout.ld
index 5942776..7a05e3b 100644
--- a/src/soc/mediatek/mt8195/include/soc/memlayout.ld
+++ b/src/soc/mediatek/mt8195/include/soc/memlayout.ld
@@ -19,6 +19,10 @@
    _ = ASSERT(size % 4K == 0, \
    	"DRAM DMA buffer should be multiple of smallest page size (4K)!");

+#define PCIE_TIMESTAMP(addr, size) \
+	REGION(pcie_timestamp, addr, size, 4) \
+	_ = ASSERT(size == 8, "PCIe timestamp should be exactly 8 byte!");
+
 SECTIONS
 {
    SRAM_START(0x00100000)
@@ -26,6 +30,7 @@
    TPM_TCPA_LOG(0x00103000, 2K)
    FMAP_CACHE(0x00103800, 2K)
    WATCHDOG_TOMBSTONE(0x00104000, 4)
+	PCIE_TIMESTAMP(0x00104004, 8)
    CBFS_MCACHE(0x00107c00, 8K)
    TIMESTAMP(0x00109c00, 1K)
    STACK(0x0010a000, 12K)
diff --git a/src/soc/mediatek/mt8195/include/soc/symbols.h b/src/soc/mediatek/mt8195/include/soc/symbols.h
index 76d9c6d..eeb466d 100644
--- a/src/soc/mediatek/mt8195/include/soc/symbols.h
+++ b/src/soc/mediatek/mt8195/include/soc/symbols.h
@@ -5,5 +5,6 @@
 #include <symbols.h>

DECLARE_REGION(dram_dma)
+DECLARE_REGION(pcie_timestamp)

#endif /* _SOC_MEDIATEK_MT8195_SYMBOLS_H_ */