[PATCH] ARM: add DEBUG_LL support for ARM64 QEMU Virt

[Ahmad Fatoum]

From: Ahmad Fatoum <a.fatoum at pengutronix.de>

We have DEBUG_LL for the PL011 on the ARM64 QEMU Virt,
but it is unused. Wire it in.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 arch/arm/Kconfig                |  1 +
 arch/arm/cpu/board-dt-2nd.c     |  2 ++
 arch/arm/include/asm/debug_ll.h | 11 +++++++++++
 common/Kconfig                  |  4 ++++
 4 files changed, 18 insertions(+)
 create mode 100644 arch/arm/include/asm/debug_ll.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 759b29ee77e1..8183f6d54686 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -292,6 +292,7 @@ config ARCH_ARM64_VIRT
 	select ARM_AMBA
 	select BOARD_ARM_VIRT
 	select HW_HAS_PCI
+	select HAS_ASM_DEBUG_LL
 
 endchoice
 
diff --git a/arch/arm/cpu/board-dt-2nd.c b/arch/arm/cpu/board-dt-2nd.c
index 6f4a6f26a8c7..6f69a6dd27a2 100644
--- a/arch/arm/cpu/board-dt-2nd.c
+++ b/arch/arm/cpu/board-dt-2nd.c
@@ -19,6 +19,8 @@ void dt_2nd_aarch64(void *fdt)
 {
 	unsigned long membase, memsize;
 
+	putc_ll('>');
+
 	/* entry point already set up stack */
 
 	arm_cpu_lowlevel_init();
diff --git a/arch/arm/include/asm/debug_ll.h b/arch/arm/include/asm/debug_ll.h
new file mode 100644
index 000000000000..d7b25a7fcab9
--- /dev/null
+++ b/arch/arm/include/asm/debug_ll.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_DEBUG_LL_H__
+#define __ASM_DEBUG_LL_H__
+
+#ifdef CONFIG_DEBUG_QEMU_ARM64_VIRT
+#define DEBUG_LL_UART_ADDR		0x9000000
+#include <debug_ll/pl011.h>
+#endif
+
+#endif
diff --git a/common/Kconfig b/common/Kconfig
index 9e175d36c43e..d95797099341 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1479,6 +1479,10 @@ config DEBUG_SUN20I
 	depends on SOC_ALLWINNER_SUN20I
 	select DEBUG_LL_NS16550
 
+config DEBUG_QEMU_ARM64_VIRT
+	bool "QEMU ARM64 Virt PL011 console"
+	depends on ARCH_ARM64_VIRT
+
 endchoice
 
 config DEBUG_LL_NS16550
-- 
2.38.1