-# Utilities for TI ICEpick-C ... used in DaVinci, OMAP3, and more.
+#
+# Copyright (C) 2011 by Karl Kurbjun
+# Copyright (C) 2009 by David Brownell
+#
+
+# Utilities for TI ICEpick-C/D used in most TI SoCs
+# Details about the ICEPick are available in the the TRM for each SoC
+# and http://processors.wiki.ti.com/index.php/ICEPICK
+
+# 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} {
- # NOTE: it's important not to enter RUN/IDLE state until
+ # 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.
- # select router
- irscan $jrc 7 -endstate IRPAUSE
- drscan $jrc 8 0x89 -endstate DRPAUSE
+ # first enable power and clock for TAP
+ icepick_c_router $jrc 1 0x2 $port 0x100048
- # set ip control
- irscan $jrc 2 -endstate IRPAUSE
+ # 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
+}
+
+# jrc == TAP name for the ICEpick
+# port == a port number, 0..15
+# Follow the sequence described in
+# http://processors.wiki.ti.com/images/f/f6/Router_Scan_Sequence-ICEpick-D.pdf
+proc icepick_d_tapenable {jrc port} {
+ # First CONNECT to the ICEPick
+ icepick_c_connect $jrc
+
+ # Select the port
+ irscan $jrc [CONST IR_ROUTER] -endstate IRPAUSE
drscan $jrc 32 [expr 0xa0002108 + ($port << 24)] -endstate DRPAUSE
- irscan $jrc 0x3F -endstate RUN/IDLE
+ # Set 4 bit core ID to the Cortex-A
+ irscan $jrc [CONST IR_ROUTER] -endstate IRPAUSE
+ drscan $jrc 32 0xe0002008 -endstate DRPAUSE
+
+ # Enter the bypass state
+ irscan $jrc [CONST IF_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
+}
+
projects / openocd / blobdiff