4 files changed, 89 insertions, 0 deletions
diff --git a/src/soc/mediatek/common/include/soc/lastbus.h b/src/soc/mediatek/common/include/soc/lastbus.h
new file mode 100644
index 0000000000..3c93efbf60
--- /dev/null
+++ b/src/soc/mediatek/common/include/soc/lastbus.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_COMMON_LASTBUS_H
+#define SOC_MEDIATEK_COMMON_LASTBUS_H
+
+/* INFRA LASTBUS INFO */
+#define BUS_INFRA_SNAPSHOT	0xd00
+#define BUS_INFRA_CTRL		0xd04
+#define INFRASYS_CONFIG		0xffff000c
+#define INFRA_NUM		17
+
+/* PERI LASTBUS INFO */
+#define BUS_PERI_R0		0x500
+#define BUS_PERI_R1		0x504
+#define PERISYS_ENABLE		0xc
+#define PERISYS_TIMEOUT		0xffff
+#define PERI_NUM		18
+
+void lastbus_init(void);
+
+#endif
diff --git a/src/soc/mediatek/common/lastbus.c b/src/soc/mediatek/common/lastbus.c
new file mode 100644
index 0000000000..cf4f8d1a42
--- /dev/null
+++ b/src/soc/mediatek/common/lastbus.c
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/lastbus.h>
+
+static unsigned long preisys_dump_offset[] = {
+	0x500, /* PERIBUS_DBG0 */
+	0x504, /* PERIBUS_DBG1 */
+	0x508, /* PERIBUS_DBG2 */
+	0x50C, /* PERIBUS_DBG3 */
+	0x510, /* PERIBUS_DBG4 */
+	0x514, /* PERIBUS_DBG5 */
+	0x518, /* PERIBUS_DBG6 */
+	0x51C, /* PERIBUS_DBG7 */
+	0x520, /* PERIBUS_DBG8 */
+	0x524, /* PERIBUS_DBG9 */
+	0x528, /* PERIBUS_DBG10 */
+	0x52C, /* PERIBUS_DBG11 */
+	0x530, /* PERIBUS_DBG12 */
+	0x534, /* PERIBUS_DBG13 */
+	0x538, /* PERIBUS_DBG14 */
+	0x53C, /* PERIBUS_DBG15 */
+	0x580, /* PERIBUS_DBG16 */
+	0x584, /* PERIBUS_DBG17 */
+};
+
+static void lastbus_setup(void)
+{
+	/* peri lastbus init */
+	write32p(PERICFG_BASE + BUS_PERI_R0, PERISYS_TIMEOUT);
+	write32p(PERICFG_BASE + BUS_PERI_R1, PERISYS_ENABLE);
+
+	/* infra lastbus init */
+	write32p(INFRACFG_AO_BASE + BUS_INFRA_CTRL, INFRASYS_CONFIG);
+}
+
+static void lastbus_dump(void)
+{
+	unsigned int i;
+	uintptr_t reg;
+
+	if (read32p(INFRACFG_AO_BASE + BUS_INFRA_CTRL) & 0x1) {
+		printk(BIOS_DEBUG, "** Dump lastbus infra debug registers start **\n");
+		for (i = 0; i < INFRA_NUM; i++) {
+			reg = INFRACFG_AO_BASE + BUS_INFRA_SNAPSHOT + 4 * i;
+			printk(BIOS_DEBUG, "%08x\n", read32p(reg));
+		}
+	}
+
+	if (read32p(PERICFG_BASE + BUS_PERI_R1) & 0x1) {
+		printk(BIOS_DEBUG, "** Dump lastbus peri debug registers start **\n");
+		for (i = 0; i < PERI_NUM; i++) {
+			reg = PERICFG_BASE + preisys_dump_offset[i];
+			printk(BIOS_DEBUG, "%08x\n", read32p(reg));
+		}
+	}
+}
+
+void lastbus_init(void)
+{
+	lastbus_dump();
+	lastbus_setup();
+}
diff --git a/src/soc/mediatek/mt8186/Makefile.inc b/src/soc/mediatek/mt8186/Makefile.inc
index bd1e560c0d..724f80fb11 100644
--- a/src/soc/mediatek/mt8186/Makefile.inc
+++ b/src/soc/mediatek/mt8186/Makefile.inc
@@ -12,6 +12,7 @@ all-y += ../common/uart.c
 bootblock-y += bootblock.c
 bootblock-y += ../common/eint_event.c
 bootblock-y += gic.c
+bootblock-y += ../common/lastbus.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/tracker.c ../common/tracker_v1.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c
diff --git a/src/soc/mediatek/mt8186/bootblock.c b/src/soc/mediatek/mt8186/bootblock.c
index e5d1e73047..9b12e562a1 100644
--- a/src/soc/mediatek/mt8186/bootblock.c
+++ b/src/soc/mediatek/mt8186/bootblock.c
@@ -3,6 +3,7 @@
 #include <bootblock_common.h>
 #include <soc/eint_event.h>
 #include <soc/gic.h>
+#include <soc/lastbus.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
 #include <soc/tracker_common.h>
@@ -12,6 +13,7 @@ void bootblock_soc_init(void)
 {
 	mtk_mmu_init();
 	bustracker_init();
+	lastbus_init();
 	mtk_wdt_init();
 	mt_pll_init();
 	unmask_eint_event_mask();