tcl: target: icepick: add icepick_d_tapenable procedure

instead of replicating icepick_d_tapenable in many of TI's newer
platforms, we can move to icepick.cfg and just call it from board TCL
configuration file.  This is similar to the C but has a few changes we
need to make.

Change-Id: I0ab48005ccd66cd5b67b919fb5e3b462288f211d
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
Reviewed-on: http://openocd.zylin.com/2030
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

tcl/target/am335x.cfg

@@ -1,3 +1,4 @@
+source [find target/icepick.cfg]
 
 if { [info exists CHIPNAME] } {
    set _CHIPNAME $CHIPNAME
@@ -5,26 +6,6 @@ if { [info exists CHIPNAME] } {
    set _CHIPNAME am335x
 }
 
-# This chip contains an IcePick-D JTAG router.  The IcePick-C configuration is almost
-# compatible, but it doesn't work.  For now, we will just embed the IcePick-D
-# routines here.
-proc icepick_d_tapenable {jrc port} {
-	# select router
-	irscan $jrc 7 -endstate IRPAUSE
-	drscan $jrc 8 0x89 -endstate DRPAUSE
-
-	# set ip control
-	irscan $jrc 2 -endstate IRPAUSE
-	drscan $jrc 32 [expr 0xa0002108 + ($port << 24)] -endstate DRPAUSE
-
-	# for icepick_D
-	irscan $jrc 2 -endstate IRPAUSE
-	drscan $jrc 32 0xe0002008 -endstate DRPAUSE
-
-	irscan $jrc 0x3F -endstate RUN/IDLE
-	runtest 10
-}
-
 #
 # M3 DAP
 #