# TI/Luminary Stellaris LM3S chip family

# Some devices have errata in returning their device class.
# DEVICECLASS is provided as a manual override
# Manual setting of a device class of 0xff is not allowed

global _DEVICECLASS

if { [info exists DEVICECLASS ] } {
   set _DEVICECLASS $DEVICECLASS
} else {
   set _DEVICECLASS 0xff
}

# Luminary chips support both JTAG and SWD transports.
# Adapt based on what transport is active.
source [find target/swj-dp.tcl]

# For now we ignore the SPI and UART options, which
# are usable only for ISP style initial flash programming.

if { [info exists CHIPNAME] } {
   set  _CHIPNAME $CHIPNAME
} else {
   set  _CHIPNAME lm3s
}

# CPU TAP ID 0x1ba00477 for early Sandstorm parts
# CPU TAP ID 0x2ba00477 for later SandStorm parts, e.g. lm3s811 Rev C2
# CPU TAP ID 0x3ba00477 for Cortex-M3 r1p2 (on Fury, DustDevil)
# CPU TAP ID 0x4ba00477 for Cortex-M3 r2p0 (on Tempest)
# ... we'll ignore the JTAG version field, rather than list every
# chip revision that turns up.
if { [info exists CPUTAPID ] } {
   set _CPUTAPID $CPUTAPID
} else {
   set _CPUTAPID 0x0ba00477
}

# SWD DAP, and JTAG TAP, take same params for now;
# ... even though SWD ignores all except TAPID, and
# JTAG shouldn't need anything more then irlen. (and TAPID).
swj_newdap $_CHIPNAME cpu -irlen 4 -irmask 0xf \
 	-expected-id $_CPUTAPID -ignore-version

if { [info exists WORKAREASIZE ] } {
   set _WORKAREASIZE $WORKAREASIZE
} else {
   # default to 8K working area
   set _WORKAREASIZE 0x2000
}

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_m3 -chain-position $_CHIPNAME.cpu

# 8K working area at base of ram, not backed up
#
# NOTE:  you may need or want to reconfigure the work area;
# some parts have just 6K, and you may want to use other
# addresses (at end of mem not beginning) or back it up.
$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE

# JTAG speed ... slow enough to work with a 12 MHz RC oscillator;
# LM3S parts don't support RTCK
#
# NOTE:  this may be increased by a reset-init handler, after it
# configures and enables the PLL.  Or you might need to decrease
# this, if you're using a slower clock.
adapter_khz 500

source [find mem_helper.tcl]

$_TARGETNAME configure -event reset-start {
	adapter_khz 500

	#	
	# When nRST is asserted on most Stellaris devices, it clears some of
	# the debug state.  The ARMv7M and Cortex-M3 TRMs say that's wrong;
	# and OpenOCD depends on those TRMs.  So we won't use SRST on those
	# chips.  (Only power-on reset should affect debug state, beyond a
	# few specified bits; not the chip's nRST input, wired to SRST.)
	#
	# REVISIT current errata specs don't seem to cover this issue.
	# Do we have more details than this email?
	#   https://lists.berlios.de/pipermail
	#	/openocd-development/2008-August/003065.html
	#

	global _DEVICECLASS

	if {$_DEVICECLASS != 0xff} {
	   set device_class $_DEVICECLASS
	} else {
	   set device_class [expr (([mrw 0x400fe000] >> 16) & 0xff)]
	}

	if {$device_class == 0 || $device_class == 1 || $device_class == 3} {
		# Sandstorm, Fury and DustDevil are able to use NVIC SYSRESETREQ
		cortex_m3 reset_config sysresetreq
	} else {
		# Tempest and newer default to using NVIC VECTRESET
		# this does mean a reset-init event handler is required to reset
		# any peripherals
		cortex_m3 reset_config vectreset
	}
}

# flash configuration ... autodetects sizes, autoprobed
flash bank $_CHIPNAME.flash stellaris 0 0 0 0 $_TARGETNAME