diff options
| -rw-r--r-- | arch/powerpc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig.debug | 9 | ||||
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 72 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg.c | 7 | ||||
| -rw-r--r-- | include/asm-powerpc/udbg.h | 3 |
5 files changed, 90 insertions, 5 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c5e01c4b637..deea4c8e1f4 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -420,6 +420,10 @@ config PPC_IBM_CELL_BLADE select MMIO_NVRAM select PPC_UDBG_16550 +config UDBG_RTAS_CONSOLE + bool + default n + config XICS depends on PPC_PSERIES bool diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index c69006ae824..e29ef77d3b0 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -134,12 +134,19 @@ config PPC_EARLY_DEBUG_G5 help Select this to enable early debugging for Apple G5 machines. -config PPC_EARLY_DEBUG_RTAS +config PPC_EARLY_DEBUG_RTAS_PANEL bool "RTAS Panel" depends on PPC_RTAS help Select this to enable early debugging via the RTAS panel. +config PPC_EARLY_DEBUG_RTAS_CONSOLE + bool "RTAS Console" + depends on PPC_RTAS + select UDBG_RTAS_CONSOLE + help + Select this to enable early debugging via the RTAS console. + config PPC_EARLY_DEBUG_MAPLE bool "Maple real mode" depends on PPC_MAPLE diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 061d8afd246..4a4cb559840 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) } } -void __init udbg_init_rtas(void) +void __init udbg_init_rtas_panel(void) { udbg_putc = call_rtas_display_status_delay; } +#ifdef CONFIG_UDBG_RTAS_CONSOLE + +/* If you think you're dying before early_init_dt_scan_rtas() does its + * work, you can hard code the token values for your firmware here and + * hardcode rtas.base/entry etc. + */ +static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; +static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; + +static void udbg_rtascon_putc(char c) +{ + int tries; + + if (!rtas.base) + return; + + /* Add CRs before LFs */ + if (c == '\n') + udbg_rtascon_putc('\r'); + + /* if there is more than one character to be displayed, wait a bit */ + for (tries = 0; tries < 16; tries++) { + if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) + break; + udelay(1000); + } +} + +static int udbg_rtascon_getc_poll(void) +{ + int c; + + if (!rtas.base) + return -1; + + if (rtas_call(rtas_getchar_token, 0, 2, &c)) + return -1; + + return c; +} + +static int udbg_rtascon_getc(void) +{ + int c; + + while ((c = udbg_rtascon_getc_poll()) == -1) + ; + + return c; +} + + +void __init udbg_init_rtas_console(void) +{ + udbg_putc = udbg_rtascon_putc; + udbg_getc = udbg_rtascon_getc; + udbg_getc_poll = udbg_rtascon_getc_poll; +} +#endif /* CONFIG_UDBG_RTAS_CONSOLE */ + void rtas_progress(char *s, unsigned short hex) { struct device_node *root; @@ -820,6 +880,16 @@ int __init early_init_dt_scan_rtas(unsigned long node, rtas.size = *sizep; } +#ifdef CONFIG_UDBG_RTAS_CONSOLE + basep = of_get_flat_dt_prop(node, "put-term-char", NULL); + if (basep) + rtas_putchar_token = *basep; + + basep = of_get_flat_dt_prop(node, "get-term-char", NULL); + if (basep) + rtas_getchar_token = *basep; +#endif + /* break now */ return 1; } diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index 67d9fd9ae2b..759afd5e0d8 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -34,9 +34,12 @@ void __init udbg_early_init(void) #elif defined(CONFIG_PPC_EARLY_DEBUG_G5) /* For use on Apple G5 machines */ udbg_init_pmac_realmode(); -#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS) +#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) /* RTAS panel debug */ - udbg_init_rtas(); + udbg_init_rtas_panel(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) + /* RTAS console debug */ + udbg_init_rtas_console(); #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) /* Maple real mode debug */ udbg_init_maple_realmode(); diff --git a/include/asm-powerpc/udbg.h b/include/asm-powerpc/udbg.h index 19a1517ac43..55e57844fa7 100644 --- a/include/asm-powerpc/udbg.h +++ b/include/asm-powerpc/udbg.h @@ -42,7 +42,8 @@ extern void __init udbg_init_debug_lpar(void); extern void __init udbg_init_pmac_realmode(void); extern void __init udbg_init_maple_realmode(void); extern void __init udbg_init_iseries(void); -extern void __init udbg_init_rtas(void); +extern void __init udbg_init_rtas_panel(void); +extern void __init udbg_init_rtas_console(void); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_UDBG_H */ |