[PATCH] powerpc: Make early debugging configurable via Kconfig

This patch adds Kconfig entries to control the early debugging options,
currently in setup_64.c.

Doing this via Kconfig rather than #defines means you can have one source tree,
which is buildable for multiple platforms - and you can enable the correct
early debug option for each platform via .config.

I made udbg_early_init() a static inline because otherwise GCC is to daft to
optimise it away when debugging is off.

Now that we have udbg_init_rtas() we can make call_rtas_display_status* static.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig.debug

@@ -115,4 +115,46 @@ config PPC_OCP
 	depends on IBM_OCP || XILINX_OCP
 	default y
 
+choice
+	prompt "Early debugging (dangerous)"
+	bool
+	optional
+	help
+	  Enable early debugging. Careful, if you enable debugging for the
+	  wrong type of machine your kernel _will not boot_.
+
+config PPC_EARLY_DEBUG_LPAR
+	bool "LPAR HV Console"
+	depends on PPC_PSERIES
+	help
+	  Select this to enable early debugging for a machine with a HVC
+	  console on vterm 0.
+
+config PPC_EARLY_DEBUG_G5
+	bool "Apple G5"
+	depends on PPC_PMAC64
+	help
+	  Select this to enable early debugging for Apple G5 machines.
+
+config PPC_EARLY_DEBUG_RTAS
+	bool "RTAS Panel"
+	depends on PPC_RTAS
+	help
+	  Select this to enable early debugging via the RTAS panel.
+
+config PPC_EARLY_DEBUG_MAPLE
+	bool "Maple real mode"
+	depends on PPC_MAPLE
+	help
+	  Select this to enable early debugging for Maple.
+
+config PPC_EARLY_DEBUG_ISERIES
+	bool "iSeries HV Console"
+	depends on PPC_ISERIES
+	help
+	  Select this to enable early debugging for legacy iSeries. You need
+	  to hit "Ctrl-x Ctrl-x" to see the messages on the console.
+
+endchoice
+
 endmenu