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|
#########
# This reset logic may be overridden by board/target/... scripts as needed
# to provide a reset that, if possible, is close to a power-up reset.
#
# Exit requirements include: (a) JTAG must be working, (b) the scan
# chain was validated with "jtag arp_init" (or equivalent), (c) nothing
# stays in reset. No TAP-specific scans were performed. It's OK if
# some targets haven't been reset yet; they may need TAP-specific scans.
#
# The "mode" values include: halt, init, run (from "reset" command);
# startup (at OpenOCD server startup, when JTAG may not yet work); and
# potentially more (for reset types like cold, warm, etc)
proc init_reset { mode } {
jtag arp_init-reset
}
global in_process_reset
set in_process_reset 0
# Catch reset recursion
proc ocd_process_reset { MODE } {
global in_process_reset
if {$in_process_reset} {
set in_process_reset 0
return -code error "'reset' can not be invoked recursively"
}
set in_process_reset 1
set success [expr [catch {ocd_process_reset_inner $MODE} result]==0]
set in_process_reset 0
if {$success} {
return $result
} else {
return -code error $result
}
}
proc ocd_process_reset_inner { MODE } {
set targets [target names]
# If this target must be halted...
set halt -1
if { 0 == [string compare $MODE halt] } {
set halt 1
}
if { 0 == [string compare $MODE init] } {
set halt 1;
}
if { 0 == [string compare $MODE run ] } {
set halt 0;
}
if { $halt < 0 } {
return -error "Invalid mode: $MODE, must be one of: halt, init, or run";
}
# Target event handlers *might* change which TAPs are enabled
# or disabled, so we fire all of them. But don't issue any
# target "arp_*" commands, which may issue JTAG transactions,
# unless we know the underlying TAP is active.
#
# NOTE: ARP == "Advanced Reset Process" ... "advanced" is
# relative to a previous restrictive scheme
foreach t $targets {
# New event script.
$t invoke-event reset-start
}
# Use TRST or TMS/TCK operations to reset all the tap controllers.
# TAP reset events get reported; they might enable some taps.
init_reset $MODE
# Examine all targets on enabled taps.
foreach t $targets {
if {[jtag tapisenabled [$t cget -chain-position]]} {
$t arp_examine
}
}
# Assert SRST, and report the pre/post events.
# Note: no target sees SRST before "pre" or after "post".
foreach t $targets {
$t invoke-event reset-assert-pre
}
foreach t $targets {
# C code needs to know if we expect to 'halt'
if {[jtag tapisenabled [$t cget -chain-position]]} {
$t arp_reset assert $halt
}
}
foreach t $targets {
$t invoke-event reset-assert-post
}
# Now de-assert SRST, and report the pre/post events.
# Note: no target sees !SRST before "pre" or after "post".
foreach t $targets {
$t invoke-event reset-deassert-pre
}
foreach t $targets {
# Again, de-assert code needs to know if we 'halt'
if {[jtag tapisenabled [$t cget -chain-position]]} {
$t arp_reset deassert $halt
}
}
foreach t $targets {
$t invoke-event reset-deassert-post
}
# Pass 1 - Now wait for any halt (requested as part of reset
# assert/deassert) to happen. Ideally it takes effect without
# first executing any instructions.
if { $halt } {
foreach t $targets {
if {[jtag tapisenabled [$t cget -chain-position]] == 0} {
continue
}
# Wait upto 1 second for target to halt. Why 1sec? Cause
# the JTAG tap reset signal might be hooked to a slow
# resistor/capacitor circuit - and it might take a while
# to charge
# Catch, but ignore any errors.
catch { $t arp_waitstate halted 1000 }
# Did we succeed?
set s [$t curstate]
if { 0 != [string compare $s "halted" ] } {
return -error [format "TARGET: %s - Not halted" $t]
}
}
}
#Pass 2 - if needed "init"
if { 0 == [string compare init $MODE] } {
foreach t $targets {
if {[jtag tapisenabled [$t cget -chain-position]] == 0} {
continue
}
set err [catch "$t arp_waitstate halted 5000"]
# Did it halt?
if { $err == 0 } {
$t invoke-event reset-init
}
}
}
foreach t $targets {
$t invoke-event reset-end
}
}
#########
# Temporary migration aid. May be removed starting in January 2011.
proc armv4_5 params {
echo "DEPRECATED! use 'arm $params' not 'armv4_5 $params'"
arm $params
}
|
