From dbb983145312efba5f7928af1b180a0d83423150 Mon Sep 17 00:00:00 2001
From: Alban Bedel <albeu@free.fr>
Date: Thu, 10 Dec 2015 10:57:21 +0100
Subject: [PATCH] MIPS: zboot: Add support for serial debug using the PROM
As most platforms implement the PROM serial interface prom_putchar()
add a simple bridge to allow re-using this code for zboot.
Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Alex Smith <alex.smith@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11811/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/Kconfig | 4 ++++
arch/mips/boot/compressed/Makefile | 1 +
arch/mips/boot/compressed/uart-prom.c | 7 +++++++
3 files changed, 12 insertions(+)
create mode 100644 arch/mips/boot/compressed/uart-prom.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 058dfd2084b81..178cf1fbd0334 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1766,6 +1766,10 @@ config SYS_SUPPORTS_ZBOOT_UART16550
bool
select SYS_SUPPORTS_ZBOOT
+config SYS_SUPPORTS_ZBOOT_UART_PROM
+ bool
+ select SYS_SUPPORTS_ZBOOT
+
config CPU_LOONGSON2
bool
select CPU_SUPPORTS_32BIT_KERNEL
diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index e66b2c69c29cb..4eff1ef02eff9 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -35,6 +35,7 @@ vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o
ifdef CONFIG_DEBUG_ZBOOT
vmlinuzobjs-$(CONFIG_DEBUG_ZBOOT) += $(obj)/dbg.o
vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
+vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM) += $(obj)/uart-prom.o
vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY) += $(obj)/uart-alchemy.o
endif
diff --git a/arch/mips/boot/compressed/uart-prom.c b/arch/mips/boot/compressed/uart-prom.c
new file mode 100644
index 0000000000000..1c3d51bc90bb8
--- /dev/null
+++ b/arch/mips/boot/compressed/uart-prom.c
@@ -0,0 +1,7 @@
+
+extern void prom_putchar(unsigned char ch);
+
+void putc(char c)
+{
+ prom_putchar(c);
+}
--
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