[PATCH 2/2] powerpc: Make early debugging configurable via Kconfig
Michael Ellerman
michael at ellerman.id.au
Tue Jan 10 13:59:02 EST 2006
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 at ellerman.id.au>
---
arch/powerpc/Kconfig.debug | 42 +++++++++++++++++++++++++++++++++++++++++
arch/powerpc/kernel/rtas.c | 10 +++++++--
arch/powerpc/kernel/setup_64.c | 38 +------------------------------------
arch/powerpc/kernel/udbg.c | 1
include/asm-powerpc/rtas.h | 1
include/asm-powerpc/udbg.h | 41 +++++++++++++++++++++++++++++++++++++++-
6 files changed, 93 insertions(+), 40 deletions(-)
Index: linux/arch/powerpc/Kconfig.debug
===================================================================
--- linux.orig/arch/powerpc/Kconfig.debug
+++ linux/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
Index: linux/arch/powerpc/kernel/rtas.c
===================================================================
--- linux.orig/arch/powerpc/kernel/rtas.c
+++ linux/arch/powerpc/kernel/rtas.c
@@ -29,6 +29,7 @@
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <asm/lmb.h>
+#include <asm/udbg.h>
struct rtas_t rtas = {
.lock = SPIN_LOCK_UNLOCKED
@@ -52,7 +53,7 @@ EXPORT_SYMBOL(rtas_flash_term_hook);
* are designed only for very early low-level debugging, which
* is why the token is hard-coded to 10.
*/
-void call_rtas_display_status(unsigned char c)
+static void call_rtas_display_status(char c)
{
struct rtas_args *args = &rtas.args;
unsigned long s;
@@ -72,7 +73,7 @@ void call_rtas_display_status(unsigned c
spin_unlock_irqrestore(&rtas.lock, s);
}
-void call_rtas_display_status_delay(unsigned char c)
+static void call_rtas_display_status_delay(char c)
{
static int pending_newline = 0; /* did last write end with unprinted newline? */
static int width = 16;
@@ -96,6 +97,11 @@ void call_rtas_display_status_delay(unsi
}
}
+void udbg_init_rtas(void)
+{
+ udbg_putc = call_rtas_display_status_delay;
+}
+
void rtas_progress(char *s, unsigned short hex)
{
struct device_node *root;
Index: linux/arch/powerpc/kernel/setup_64.c
===================================================================
--- linux.orig/arch/powerpc/kernel/setup_64.c
+++ linux/arch/powerpc/kernel/setup_64.c
@@ -70,37 +70,6 @@
#define DBG(fmt...)
#endif
-/*
- * Here are some early debugging facilities. You can enable one
- * but your kernel will not boot on anything else if you do so
- */
-
-/* For use on LPAR machines that support an HVC console on vterm 0 */
-extern void udbg_init_debug_lpar(void);
-
-/* This one is for use on Apple G5 machines */
-extern void udbg_init_pmac_realmode(void);
-
-/* That's RTAS panel debug */
-extern void call_rtas_display_status_delay(unsigned char c);
-
-/* Here's maple real mode debug */
-extern void udbg_init_maple_realmode(void);
-
-/* For iSeries - hit Ctrl-x Ctrl-x to see the output */
-extern void udbg_init_iseries(void);
-
-#define EARLY_DEBUG_INIT() do {} while(0)
-
-#if 0
-#define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
-#define EARLY_DEBUG_INIT() udbg_init_iseries()
-#define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
-#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
-#define EARLY_DEBUG_INIT() \
- do { udbg_putc = call_rtas_display_status_delay; } while(0)
-#endif
-
int have_of = 1;
int boot_cpuid = 0;
int boot_cpuid_phys = 0;
@@ -241,11 +210,8 @@ void __init early_setup(unsigned long dt
struct paca_struct *lpaca = get_paca();
static struct machdep_calls **mach;
- /*
- * Enable early debugging if any specified (see top of
- * this file)
- */
- EARLY_DEBUG_INIT();
+ /* Enable early debugging if any specified (see udbg.h) */
+ udbg_early_init();
DBG(" -> early_setup()\n");
Index: linux/arch/powerpc/kernel/udbg.c
===================================================================
--- linux.orig/arch/powerpc/kernel/udbg.c
+++ linux/arch/powerpc/kernel/udbg.c
@@ -15,6 +15,7 @@
#include <linux/sched.h>
#include <linux/console.h>
#include <asm/processor.h>
+#include <asm/udbg.h>
void (*udbg_putc)(char c);
int (*udbg_getc)(void);
Index: linux/include/asm-powerpc/udbg.h
===================================================================
--- linux.orig/include/asm-powerpc/udbg.h
+++ linux/include/asm-powerpc/udbg.h
@@ -1,5 +1,5 @@
/*
- * c 2001 PPC 64 Team, IBM Corp
+ * (c) 2001, 2006 IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -35,5 +35,44 @@ extern void udbg_scc_init(int force_scc)
extern int udbg_adb_init(int force_btext);
extern void udbg_adb_init_early(void);
+extern void udbg_init_debug_lpar(void);
+extern void udbg_init_pmac_realmode(void);
+extern void udbg_init_maple_realmode(void);
+extern void udbg_init_iseries(void);
+extern void udbg_init_rtas(void);
+
+/*
+ * Early debugging facilities. You can enable _one_ of these, but if you do so
+ * your kernel _will not boot_ on anything else. Be careful.
+ */
+static inline void udbg_early_init(void)
+{
+#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
+
+ /* For LPAR machines that have an HVC console on vterm 0 */
+ udbg_init_debug_lpar();
+
+#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
+
+ /* For use on Apple G5 machines */
+ udbg_init_pmac_realmode();
+
+#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS)
+
+ /* RTAS panel debug */
+ udbg_init_rtas();
+
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
+
+ /* Maple real mode debug */
+ udbg_init_maple_realmode();
+
+#elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
+
+ /* For iSeries - hit Ctrl-x Ctrl-x to see the output */
+ udbg_init_iseries();
+#endif
+}
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_UDBG_H */
Index: linux/include/asm-powerpc/rtas.h
===================================================================
--- linux.orig/include/asm-powerpc/rtas.h
+++ linux/include/asm-powerpc/rtas.h
@@ -161,7 +161,6 @@ extern struct rtas_t rtas;
extern void enter_rtas(unsigned long);
extern int rtas_token(const char *service);
extern int rtas_call(int token, int, int, int *, ...);
-extern void call_rtas_display_status(unsigned char);
extern void rtas_restart(char *cmd);
extern void rtas_power_off(void);
extern void rtas_halt(void);
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