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authorAlban Bedel <albeu@free.fr>2015-12-10 10:57:21 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-01-24 04:05:51 +0100
commitdbb983145312efba5f7928af1b180a0d83423150 (patch)
tree98014f40f1c450716bf4b2966f31822b42ac03f0
parent25f66096ac0cbb8e757e6ce3f78665eedb946b17 (diff)
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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>
-rw-r--r--arch/mips/Kconfig4
-rw-r--r--arch/mips/boot/compressed/Makefile1
-rw-r--r--arch/mips/boot/compressed/uart-prom.c7
3 files changed, 12 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 058dfd2084b8..178cf1fbd033 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 e66b2c69c29c..4eff1ef02eff 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 000000000000..1c3d51bc90bb
--- /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);
+}