soc/mediatek/mt8196: Disable irq2axi feature

Irq2axi translates wire-based interrupt into message signal interrupt.
Since MT8196 uses legacy wire-based interrupt, this feature needs to be
disabled. If the interrupt is not handled, it will cause the system fail
to boot.

TEST=Build pass, check irq2axi_disable log and the interrupt can be
correctly handled by checking /proc/interrupts.
BUG=b:317009620

Signed-off-by: Runyang Chen <runyang.chen@mediatek.corp-partner.google.com>
Change-Id: I0e89a0ee75e574a4b9e8df0a0f6a5f6e03bba2d6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84896
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rauru/romstage.c

@@ -1,11 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <arch/stages.h>
+#include <soc/irq2axi.h>
 #include <soc/pcie.h>
 
 void platform_romstage_main(void)
 {
-	/* TODO: add romstage main function */
+	irq2axi_disable();
 
 	if (CONFIG(PCI))
 		mtk_pcie_deassert_perst();

src/soc/mediatek/mt8196/Makefile.mk

@@ -19,6 +19,7 @@ bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c
 romstage-y += ../common/cbmem.c
 romstage-$(CONFIG_PCI) += ../common/early_init.c ../common/pcie.c
 romstage-y += emi.c
+romstage-y += irq2axi.c
 romstage-y += l2c_ops.c
 romstage-y += ../common/mmu_operations.c ../common/mmu_cmops.c
 

src/soc/mediatek/mt8196/include/soc/irq2axi.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_MT8196_IRQ2AXI_H
+#define SOC_MEDIATEK_MT8196_IRQ2AXI_H
+
+#define IRQ2AXI_BASE			0x14413000
+#define IRQ2AXI_CFG1			(IRQ2AXI_BASE + 0x0004)
+
+#define APIFR_AO_IO_INTX_SEC_REG	0x101C9000
+#define CIRQ_AXI_MODE			(APIFR_AO_IO_INTX_SEC_REG + 0x900)
+#define CIRQ_AXI_MODE_LEGACY		0x3
+
+#define MCUSYS_ACK_REG			0x0C00FFEC
+#define MCUSYS_ACK_CLR			0x1
+
+void irq2axi_disable(void);
+
+#endif /* SOC_MEDIATEK_MT8196_IRQ2AXI_H */

src/soc/mediatek/mt8196/irq2axi.c

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/irq2axi.h>
+
+void irq2axi_disable(void)
+{
+	printk(BIOS_DEBUG, "%s\n", __func__);
+	/* disable IRQ2AXI */
+	write32p(IRQ2AXI_CFG1, 0x0);
+
+	/* disable mcusys ack */
+	clrbits32p(MCUSYS_ACK_REG, MCUSYS_ACK_CLR);
+
+	/* switch to legacy channel */
+	clrbits32p(CIRQ_AXI_MODE, CIRQ_AXI_MODE_LEGACY);
+}