[openfirmware] [commit] r3457 - cpu/arm/olpc
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svn at openfirmware.info
Sat Nov 24 01:34:04 CET 2012
Author: wmb
Date: Sat Nov 24 01:34:03 2012
New Revision: 3457
URL: http://tracker.coreboot.org/trac/openfirmware/changeset/3457
Log:
XO-4 - Additional SMBUS functions for HDMI EDID reading.
Modified:
cpu/arm/olpc/smbus.fth
Modified: cpu/arm/olpc/smbus.fth
==============================================================================
--- cpu/arm/olpc/smbus.fth Sat Nov 24 01:33:25 2012 (r3456)
+++ cpu/arm/olpc/smbus.fth Sat Nov 24 01:34:03 2012 (r3457)
@@ -128,6 +128,29 @@
smb-stop ( )
;
+: smb-read ( adr len reg# -- )
+ over 0= if 3drop exit then ( adr len reg# )
+ smb-start ( adr len reg# )
+ 0 smb-addr ( adr len reg# )
+ smb-byte ( adr len )
+ smb-stop smb-start \ SCCB bus needs a stop and a start for the second phase
+ 1 smb-addr ( adr len )
+ 2dup bounds ?do ( adr len )
+ 0 smb-byte-in i c! ( adr len )
+ loop ( adr len )
+ 1 smb-byte-in -rot ( byte adr len )
+ 1- + c! ( )
+ smb-stop ( )
+;
+
+: smb-write ( adr len reg# -- )
+ smb-start ( adr len reg# )
+ 0 smb-addr ( adr len reg# )
+ smb-byte ( adr len )
+ bounds ?do i c@ smb-byte loop ( )
+ smb-stop ( )
+;
+
: smb-word! ( word reg# -- )
smb-start
0 smb-addr ( word reg# )
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