psoc4: support for Cypress PSoC 41xx/42xx family

New NOR flash driver was derived from stm32lx.
Procedure ocd_process_reset_inner is overriden in psoc4.cfg
to handle reset halt and system ROM peculiarities.

Change-Id: Ib835324412d106ad749e1351a8e18e6be34ca500
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/2282
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

1 files changed, 152 insertions, 0 deletions

diff --git a/tcl/target/psoc4.cfg b/tcl/target/psoc4.cfg
new file mode 100644
index 0000000..2416dbe
--- /dev/null
+++ b/tcl/target/psoc4.cfg
@@ -0,0 +1,152 @@
+# script for Cypress PSoC 41xx/42xx family
+
+#
+# PSoC 4 devices support SWD transports only.
+#
+source [find target/swj-dp.tcl]
+
+if { [info exists CHIPNAME] } {
+   set _CHIPNAME $CHIPNAME
+} else {
+   set _CHIPNAME psoc4
+}
+
+# Work-area is a space in RAM used for flash programming
+# By default use 4kB
+if { [info exists WORKAREASIZE] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x1000
+}
+
+if { [info exists CPUTAPID] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x0bb11477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -chain-position $_TARGETNAME
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME psoc4 0 0 0 0 $_TARGETNAME
+
+adapter_khz 1500
+
+# Reset, bloody PSoC 4 reset
+#
+# 1) XRES (nSRST) resets also SWD DP so SWD line reset and DP reinit is needed.
+# High level adapter stops working after SRST and needs OpenOCD restart.
+# If your hw does not use SRST for other circuits, use sysresetreq instead
+#
+# 2) PSoC 4 executes initialization code from system ROM after reset.
+# This code subsequently jumps to user flash reset vector address.
+# Unfortunately the system ROM code is protected from reading and debugging.
+# Protection breaks vector catch VC_CORERESET used for "reset halt" by cortex_m.
+#
+# Cypress uses TEST_MODE flag to loop CPU in system ROM before executing code
+# from user flash. Programming specifications states that TEST_MODE flag must be
+# set in time frame 400 usec delayed about 1 msec from reset.
+#
+# OpenOCD have no standard way how to set TEST_MODE in specified time frame.
+# TEST_MODE flag is set before reset instead. It worked for tested chips
+# despite it is not guaranteed by specification.
+#
+# 3) SWD cannot be connected during system initialization after reset.
+# This might be a reason for unconnecting ST-Link v2 when deasserting reset.
+# As a workaround arp_reset deassert is not called for hla
+
+if {![using_hla]} {
+   # if srst is not fitted use SYSRESETREQ to
+   # perform a soft reset
+   cortex_m reset_config sysresetreq
+}
+
+proc ocd_process_reset_inner { MODE } {
+	if { 0 != [string compare psoc4.cpu [target names]] } {
+		return -code error "PSoC 4 reset can handle only one psoc4.cpu target";
+	}
+	set t psoc4.cpu
+
+	# 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 -code error "Invalid mode: $MODE, must be one of: halt, init, or run";
+	}
+
+	#$t invoke-event reset-start
+	$t invoke-event reset-assert-pre
+
+	set TEST_MODE 0x40030014
+	if { $halt == 1 } {
+		mww $TEST_MODE 0x80000000
+	} else {
+		mww $TEST_MODE 0
+	}
+
+	$t arp_reset assert 0
+	$t invoke-event reset-assert-post
+	$t invoke-event reset-deassert-pre
+	if {![using_hla]} {	# workaround ST-Link v2 fails and forcing reconnect
+		$t arp_reset deassert 0
+	}
+	$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 } {
+		# Now PSoC CPU should loop in system ROM
+		$t arp_waitstate running 200
+		$t arp_halt
+
+		# 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 -code error [format "TARGET: %s - Not halted" $t]
+		}
+
+		# Check if PSoC CPU is stopped in system ROM
+		set pc [ocd_reg pc]
+		regsub {pc[^:]*: } $pc "" pc
+		if { $pc < 0x10000000 || $pc > 0x1000ffff } {
+			return -code error [format "TARGET: %s - Not halted is system ROM" $t]
+		}
+
+		# Set registers to reset vector values
+		mem2array value 32 0 2
+		reg pc [expr $value(1) & 0xfffffffe ]
+		reg msp $value(0)
+
+		mww $TEST_MODE 0
+	}
+
+	#Pass 2 - if needed "init"
+	if { 0 == [string compare init $MODE] } {
+		set err [catch "$t arp_waitstate halted 5000"]
+
+		# Did it halt?
+		if { $err == 0 } {
+			$t invoke-event reset-init
+		}
+	}
+
+	$t invoke-event reset-end
+}