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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 12:06:19 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 16:30:52 +1000
commitf023bf0f91f1f1b926ec8f5cf0ee24be134bf024 (patch)
tree32f8fdc281d6a76153aab7ae6f8f28c6cbf1f485
parent83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d (diff)
downloadlinux-f023bf0f91f1f1b926ec8f5cf0ee24be134bf024.tar.gz
powerpc/powermac: Use sane default baudrate for SCC debugging
When using the "sccdbg" option to route early kernel messages and xmon to the SCC serial port on PowerMacs, when this wasn't the configured output port of Open Firmware, we initialize the baudrate to 57600bps. This isn't a very good default on some powermacs where both the FW and pmac_zilog will default to 38400. This fixes it to use the same logic as pmac_zilog to pick a default speed. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/platforms/powermac/udbg_scc.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powermac/udbg_scc.c b/arch/powerpc/platforms/powermac/udbg_scc.c
index 47de4d3fc16..572771fd846 100644
--- a/arch/powerpc/platforms/powermac/udbg_scc.c
+++ b/arch/powerpc/platforms/powermac/udbg_scc.c
@@ -125,13 +125,23 @@ void udbg_scc_init(int force_scc)
out_8(sccc, 0xc0);
/* If SCC was the OF output port, read the BRG value, else
- * Setup for 57600 8N1
+ * Setup for 38400 or 57600 8N1 depending on the machine
*/
if (ch_def != NULL) {
out_8(sccc, 13);
scc_inittab[1] = in_8(sccc);
out_8(sccc, 12);
scc_inittab[3] = in_8(sccc);
+ } else if (machine_is_compatible("RackMac1,1")
+ || machine_is_compatible("RackMac1,2")
+ || machine_is_compatible("MacRISC4")) {
+ /* Xserves and G5s default to 57600 */
+ scc_inittab[1] = 0;
+ scc_inittab[3] = 0;
+ } else {
+ /* Others default to 38400 */
+ scc_inittab[1] = 0;
+ scc_inittab[3] = 1;
}
for (i = 0; i < sizeof(scc_inittab); ++i)