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#
# Copyright (C) 2011 by Karl Kurbjun
# Copyright (C) 2009 by David Brownell
#
# Utilities for TI ICEpick-C ... used in DaVinci, OMAP3, and more.
# Details about the ICEPickC are available in the AM/DM37x document SPRUGN4M
# create "constants"
proc CONST { key } {
array set constant {
# define ICEPick instructions
IR_BYPASS 0x00
IR_ROUTER 0x02
IR_CONNECT 0x07
IF_BYPASS 0x3F
}
return $constant($key)
}
# Instruction to connect to the icepick module
proc icepick_c_connect {jrc} {
# Send CONNECT instruction in IR state
irscan $jrc [CONST IR_CONNECT] -endstate IRPAUSE
# Send write and connect key
drscan $jrc 8 0x89 -endstate DRPAUSE
}
# Instruction to disconnect to the icepick module
proc icepick_c_disconnect {jrc} {
# Send CONNECT instruction in IR state
irscan $jrc [CONST IR_CONNECT] -endstate IRPAUSE
# Send write and connect key
drscan $jrc 8 0x86 -endstate DRPAUSE
}
#
# icepick_c_router:
# this function is for sending router commands
# arguments are:
# jrc: TAP name for the ICEpick
# rw: read/write (0 for read, 1 for write)
# block: icepick or DAP
# register: which register to read/write
# payload: value to read/write
# this function is for sending router commands
#
proc icepick_c_router {jrc rw block register payload} {
set new_dr_value \
[expr ( ($rw & 0x1) << 31) | ( ($block & 0x7) << 28) | \
( ($register & 0xF) << 24) | ( $payload & 0xFFFFFF ) ]
# echo "\tNew router value:\t0x[format %x $new_dr_value]"
# select router
irscan $jrc [CONST IR_ROUTER] -endstate IRPAUSE
# ROUTER instructions are 32 bits wide
set old_dr_value [drscan $jrc 32 $new_dr_value -endstate DRPAUSE]
}
# Configure the icepick control register
proc icepick_c_setup {jrc} {
# send a router write, block is 0, register is 1, value is 0x2100
icepick_c_router $jrc 1 0x0 0x1 0x001000
}
# jrc == TAP name for the ICEpick
# port == a port number, 0..15
proc icepick_c_tapenable {jrc port} {
# First CONNECT to the ICEPick
# echo "Connecting to ICEPick"
icepick_c_connect $jrc
# echo "Configuring the ICEpick"
icepick_c_setup $jrc
# NOTE: it's important not to enter RUN/IDLE state until
# done sending these instructions and data to the ICEpick.
# And never to enter RESET, which will disable the TAPs.
# first enable power and clock for TAP
icepick_c_router $jrc 1 0x2 $port 0x100048
# TRM states that the register should be read back here, skipped for now
# enable debug "default" mode
icepick_c_router $jrc 1 0x2 $port 0x102048
# TRM states that debug enable and debug mode should be read back and
# confirmed - skipped for now
# Finally select the tap
icepick_c_router $jrc 1 0x2 $port 0x102148
# Enter the bypass state
irscan $jrc [CONST IR_BYPASS] -endstate RUN/IDLE
runtest 10
}
# This function uses the ICEPick to send a warm system reset
proc icepick_c_wreset {jrc} {
# send a router write, block is 0, register is 1, value is 0x2100
icepick_c_router $jrc 1 0x0 0x1 0x002101
}
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