diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2006-10-03 14:47:58 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-10-04 14:52:31 +1000 |
| commit | 2ec6ef1034632c67896955d52bf8efb99195b742 (patch) | |
| tree | 70d72ae09ccc2525be7769935eed57909c551695 /arch/powerpc | |
| parent | 54c9941288e86fad983e307e540808e155b16b34 (diff) | |
| download | linux-2ec6ef1034632c67896955d52bf8efb99195b742.tar.bz2 | |
[POWERPC] Get default baud rate in udbg_scc
On powermac, when open firmware is set to use the SCC for console, this
causes the low level udbg early console to read back the speed and
re-use it instead of hard coding 57600 bps. This doesn't (yet) pass the
detected speed all the way to pmac_zilog though.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/powermac/udbg_scc.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powermac/udbg_scc.c b/arch/powerpc/platforms/powermac/udbg_scc.c index ce1a235855f7..379db05b0082 100644 --- a/arch/powerpc/platforms/powermac/udbg_scc.c +++ b/arch/powerpc/platforms/powermac/udbg_scc.c @@ -111,8 +111,6 @@ void udbg_scc_init(int force_scc) pmac_call_feature(PMAC_FTR_SCC_ENABLE, ch, PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1); - - /* Setup for 57600 8N1 */ if (ch == ch_a) addr += 0x20; sccc = ioremap(addr & PAGE_MASK, PAGE_SIZE) ; @@ -125,9 +123,21 @@ void udbg_scc_init(int force_scc) x = in_8(sccc); out_8(sccc, 0x09); /* reset A or B side */ out_8(sccc, 0xc0); + + /* If SCC was the OF output port, read the BRG value, else + * Setup for 57600 8N1 + */ + if (ch_def != NULL) { + out_8(sccc, 13); + scc_inittab[1] = in_8(sccc); + out_8(sccc, 12); + scc_inittab[3] = in_8(sccc); + } + for (i = 0; i < sizeof(scc_inittab); ++i) out_8(sccc, scc_inittab[i]); + udbg_putc = udbg_scc_putc; udbg_getc = udbg_scc_getc; udbg_getc_poll = udbg_scc_getc_poll; |