diff options
| author | Olof Johansson <olof@lixom.net> | 2007-02-04 16:36:49 -0600 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-02-07 14:03:22 +1100 |
| commit | 39c870d5b503fa684198baf90bab2daa35ef0151 (patch) | |
| tree | 0afdc842f7714cf47892512bb93ae5453bb6c34d /arch | |
| parent | a1fdf6940a2a3d3c7475755eba5881403473252d (diff) | |
[POWERPC] pasemi: UART udbg support
Early debug output for PA Semi UART. Uses the 2.05 CI real mode ops.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Kconfig.debug | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/misc_64.S | 40 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg_16550.c | 24 |
4 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 2bbeb1b1995..d39d13327e6 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -185,6 +185,13 @@ config PPC_EARLY_DEBUG_ISERIES Select this to enable early debugging for legacy iSeries. You need to hit "Ctrl-x Ctrl-x" to see the messages on the console. +config PPC_EARLY_DEBUG_PAS_REALMODE + bool "PA Semi real mode" + depends on PPC_PASEMI + help + Select this to enable early debugging for PA Semi. + Output will be on UART0. + config PPC_EARLY_DEBUG_BEAT bool "Beat HV Console" depends on PPC_CELLEB diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 21fd2c662a9..519861da042 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -311,6 +311,46 @@ _GLOBAL(real_writeb) blr #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */ +#ifdef CONFIG_PPC_PASEMI + +/* No support in all binutils for these yet, so use defines */ +#define LBZCIX(RT,RA,RB) .long (0x7c0006aa|(RT<<21)|(RA<<16)|(RB << 11)) +#define STBCIX(RS,RA,RB) .long (0x7c0007aa|(RS<<21)|(RA<<16)|(RB << 11)) + + +_GLOBAL(real_205_readb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + LBZCIX(r3,0,r3) + isync + mtmsrd r7 + sync + isync + blr + +_GLOBAL(real_205_writeb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + STBCIX(r3,0,r4) + isync + mtmsrd r7 + sync + isync + blr + +#endif /* CONFIG_PPC_PASEMI */ + + #ifdef CONFIG_CPU_FREQ_PMAC64 /* * SCOM access functions for 970 (FX only for now) diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index e225a761dc2..8f5afdbad0d 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -47,6 +47,8 @@ void __init udbg_early_init(void) udbg_init_iseries(); #elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT) udbg_init_debug_beat(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) + udbg_init_pas_realmode(); #endif } diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c index 2d17f2b8eda..e738f93b42f 100644 --- a/arch/powerpc/kernel/udbg_16550.c +++ b/arch/powerpc/kernel/udbg_16550.c @@ -14,6 +14,8 @@ extern u8 real_readb(volatile u8 __iomem *addr); extern void real_writeb(u8 data, volatile u8 __iomem *addr); +extern u8 real_205_readb(volatile u8 __iomem *addr); +extern void real_205_writeb(u8 data, volatile u8 __iomem *addr); struct NS16550 { /* this struct must be packed */ @@ -167,3 +169,25 @@ void __init udbg_init_maple_realmode(void) udbg_getc_poll = NULL; } #endif /* CONFIG_PPC_MAPLE */ + +#ifdef CONFIG_PPC_PASEMI +void udbg_pas_real_putc(char c) +{ + if (udbg_comport) { + while ((real_205_readb(&udbg_comport->lsr) & LSR_THRE) == 0) + /* wait for idle */; + real_205_writeb(c, &udbg_comport->thr); eieio(); + if (c == '\n') + udbg_pas_real_putc('\r'); + } +} + +void udbg_init_pas_realmode(void) +{ + udbg_comport = (volatile struct NS16550 __iomem *)0xfcff03f8; + + udbg_putc = udbg_pas_real_putc; + udbg_getc = NULL; + udbg_getc_poll = NULL; +} +#endif /* CONFIG_PPC_MAPLE */ |