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authorMichael Ellerman <michael@ellerman.id.au>2006-06-23 04:20:16 -0400
committerPaul Mackerras <paulus@samba.org>2006-06-27 21:59:48 -0400
commitcc46bb98c0d52695f26c239de701050660f5c79f (patch)
tree1b40e9db66de5c41c0b2fdf1db022f645a46a697 /arch
parent458148c00b97864a27ecf528a1d45a8e5ebd9bbc (diff)
[POWERPC] Add udbg support for RTAS console
Add udbg hooks for the RTAS console, based on the RTAS put-term-char and get-term-char calls. Along with my previous patches, this should enable debugging as soon as early_init_dt_scan_rtas() is called. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/Kconfig4
-rw-r--r--arch/powerpc/Kconfig.debug9
-rw-r--r--arch/powerpc/kernel/rtas.c72
-rw-r--r--arch/powerpc/kernel/udbg.c7
4 files changed, 88 insertions, 4 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c5e01c4b637d..deea4c8e1f4e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -420,6 +420,10 @@ config PPC_IBM_CELL_BLADE
420 select MMIO_NVRAM 420 select MMIO_NVRAM
421 select PPC_UDBG_16550 421 select PPC_UDBG_16550
422 422
423config UDBG_RTAS_CONSOLE
424 bool
425 default n
426
423config XICS 427config XICS
424 depends on PPC_PSERIES 428 depends on PPC_PSERIES
425 bool 429 bool
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index c69006ae8246..e29ef77d3b00 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -134,12 +134,19 @@ config PPC_EARLY_DEBUG_G5
134 help 134 help
135 Select this to enable early debugging for Apple G5 machines. 135 Select this to enable early debugging for Apple G5 machines.
136 136
137config PPC_EARLY_DEBUG_RTAS 137config PPC_EARLY_DEBUG_RTAS_PANEL
138 bool "RTAS Panel" 138 bool "RTAS Panel"
139 depends on PPC_RTAS 139 depends on PPC_RTAS
140 help 140 help
141 Select this to enable early debugging via the RTAS panel. 141 Select this to enable early debugging via the RTAS panel.
142 142
143config PPC_EARLY_DEBUG_RTAS_CONSOLE
144 bool "RTAS Console"
145 depends on PPC_RTAS
146 select UDBG_RTAS_CONSOLE
147 help
148 Select this to enable early debugging via the RTAS console.
149
143config PPC_EARLY_DEBUG_MAPLE 150config PPC_EARLY_DEBUG_MAPLE
144 bool "Maple real mode" 151 bool "Maple real mode"
145 depends on PPC_MAPLE 152 depends on PPC_MAPLE
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 061d8afd246e..4a4cb5598402 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -109,11 +109,71 @@ static void call_rtas_display_status_delay(char c)
109 } 109 }
110} 110}
111 111
112void __init udbg_init_rtas(void) 112void __init udbg_init_rtas_panel(void)
113{ 113{
114 udbg_putc = call_rtas_display_status_delay; 114 udbg_putc = call_rtas_display_status_delay;
115} 115}
116 116
117#ifdef CONFIG_UDBG_RTAS_CONSOLE
118
119/* If you think you're dying before early_init_dt_scan_rtas() does its
120 * work, you can hard code the token values for your firmware here and
121 * hardcode rtas.base/entry etc.
122 */
123static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
124static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
125
126static void udbg_rtascon_putc(char c)
127{
128 int tries;
129
130 if (!rtas.base)
131 return;
132
133 /* Add CRs before LFs */
134 if (c == '\n')
135 udbg_rtascon_putc('\r');
136
137 /* if there is more than one character to be displayed, wait a bit */
138 for (tries = 0; tries < 16; tries++) {
139 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
140 break;
141 udelay(1000);
142 }
143}
144
145static int udbg_rtascon_getc_poll(void)
146{
147 int c;
148
149 if (!rtas.base)
150 return -1;
151
152 if (rtas_call(rtas_getchar_token, 0, 2, &c))
153 return -1;
154
155 return c;
156}
157
158static int udbg_rtascon_getc(void)
159{
160 int c;
161
162 while ((c = udbg_rtascon_getc_poll()) == -1)
163 ;
164
165 return c;
166}
167
168
169void __init udbg_init_rtas_console(void)
170{
171 udbg_putc = udbg_rtascon_putc;
172 udbg_getc = udbg_rtascon_getc;
173 udbg_getc_poll = udbg_rtascon_getc_poll;
174}
175#endif /* CONFIG_UDBG_RTAS_CONSOLE */
176
117void rtas_progress(char *s, unsigned short hex) 177void rtas_progress(char *s, unsigned short hex)
118{ 178{
119 struct device_node *root; 179 struct device_node *root;
@@ -820,6 +880,16 @@ int __init early_init_dt_scan_rtas(unsigned long node,
820 rtas.size = *sizep; 880 rtas.size = *sizep;
821 } 881 }
822 882
883#ifdef CONFIG_UDBG_RTAS_CONSOLE
884 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
885 if (basep)
886 rtas_putchar_token = *basep;
887
888 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
889 if (basep)
890 rtas_getchar_token = *basep;
891#endif
892
823 /* break now */ 893 /* break now */
824 return 1; 894 return 1;
825} 895}
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 67d9fd9ae2b5..759afd5e0d8a 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -34,9 +34,12 @@ void __init udbg_early_init(void)
34#elif defined(CONFIG_PPC_EARLY_DEBUG_G5) 34#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
35 /* For use on Apple G5 machines */ 35 /* For use on Apple G5 machines */
36 udbg_init_pmac_realmode(); 36 udbg_init_pmac_realmode();
37#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS) 37#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
38 /* RTAS panel debug */ 38 /* RTAS panel debug */
39 udbg_init_rtas(); 39 udbg_init_rtas_panel();
40#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
41 /* RTAS console debug */
42 udbg_init_rtas_console();
40#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) 43#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
41 /* Maple real mode debug */ 44 /* Maple real mode debug */
42 udbg_init_maple_realmode(); 45 udbg_init_maple_realmode();