vendor/mediatek: Add MT8195 dram initialization code

This is the DRAM initialization code from the reference
implementation released by Mediatek for MT8195.

The DRAM calibration code can be taken as a standalone
library, used by different boot loaders for initializing
DRAM and following a different coding style (coreboot was
using Linux Kernel coding style), so we have to put it
in vendor code folder.

Signed-off-by: Ryan Chuang <ryan.chuang@mediatek.com>
Change-Id: Iada3ec5ae8a39a8e9253caba550c834d486dddcd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54230
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/vendorcode/mediatek/mt8195/include/reg.h b/src/vendorcode/mediatek/mt8195/include/reg.h
new file mode 100644
index 0000000000..9d3216e875
--- /dev/null
+++ b/src/vendorcode/mediatek/mt8195/include/reg.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#ifndef REG_H
+#define REG_H
+
+#define REG32(addr) ((volatile uint32_t *)(uintptr_t)(addr))
+
+#define read32(addr)       (*REG32(addr))
+#define write32(addr, val) (*REG32(addr) = (val))
+
+#endif