soc/mediatek: Move emi.c to common folder

The emi.c is the same for MT8186 and MT8188, so we could move it to
the common folder and reuse it.

TEST=build pass
BUG=b:236331724

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I225f1d07c973129172f01bf7f4d7f5d5abe7c02b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66328
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/soc/mediatek/common/emi.c b/src/soc/mediatek/common/emi.c
new file mode 100644
index 000000000000..d5470d2fd372
--- /dev/null
+++ b/src/soc/mediatek/common/emi.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <assert.h>
+#include <cbmem.h>
+#include <commonlib/bsd/mem_chip_info.h>
+#include <soc/emi.h>
+
+size_t sdram_size(void)
+{
+	const struct mem_chip_info *mc;
+	size_t size = 0;
+
+	if (ENV_RAMINIT) {
+		size = mtk_dram_size();
+		printk(BIOS_INFO, "dram size (romstage): %#lx\n", size);
+		return size;
+	}
+
+	mc = cbmem_find(CBMEM_ID_MEM_CHIP_INFO);
+	assert(mc);
+
+	for (unsigned int i = 0; i < mc->num_channels; ++i)
+		size += mc->channel[i].density;
+
+	printk(BIOS_INFO, "dram size: %#lx\n", size);
+	return size;
+}
+
+void mt_set_emi(struct dramc_param *dparam)
+{
+	/* Do nothing */
+}