From cb7dbc1af41068f826246beb53870c01d8973bb8 Mon Sep 17 00:00:00 2001
From: Zachary T Welch <zw@superlucidity.net>
Date: Tue, 17 Nov 2009 08:29:20 -0800
Subject: split startup.tcl file across modules

Moves definitions for each layer into their own file, eliminating
layering violations in the built-in TCL code.  Updates src/Makefile.am
rules to include all files in the final startup.tcl input file, and
others Makefile.am rules to distribute the new files in our packages.
---
 src/target/startup.tcl | 165 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 src/target/startup.tcl

(limited to 'src/target/startup.tcl')

diff --git a/src/target/startup.tcl b/src/target/startup.tcl
new file mode 100644
index 0000000..d480f33
--- /dev/null
+++ b/src/target/startup.tcl
@@ -0,0 +1,165 @@
+#########
+
+# 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
+}
-- 
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