# SPDX-License-Identifier: GPL-2.0-or-later

# script for ATMEL sam3, a Cortex-M3 chip
#
# at91sam3u4e
# at91sam3u2e
# at91sam3u1e
# at91sam3u4c
# at91sam3u2c
# at91sam3u1c
#
# at91sam3s4c
# at91sam3s4b
# at91sam3s4a
# at91sam3s2c
# at91sam3s2b
# at91sam3s2a
# at91sam3s1c
# at91sam3s1b
# at91sam3s1a
#
# at91sam3A4C
# at91sam3A8C
# at91sam3X4C
# at91sam3X4E
# at91sam3X8C
# at91sam3X8E
# at91sam3X8H

source [find target/swj-dp.tcl]

if { [info exists CHIPNAME] } {
   set _CHIPNAME $CHIPNAME
} else {
   set _CHIPNAME sam3
}

if { [info exists ENDIAN] } {
   set _ENDIAN $ENDIAN
} else {
   set _ENDIAN little
}

# Work-area is a space in RAM used for flash programming
# By default use 64kB
if { [info exists WORKAREASIZE] } {
   set _WORKAREASIZE $WORKAREASIZE
} else {
   set _WORKAREASIZE 0x4000
}

#jtag scan chain
if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
   set _CPUTAPID 0x4ba00477
}

swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap

# 16K is plenty, the smallest chip has this much
$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0

$_TARGETNAME configure -event gdb-flash-erase-start {
    halt
}

# JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz
#
# Since we may be running of an RC oscilator, we crank down the speed a
# bit more to be on the safe side. Perhaps superstition, but if are
# running off a crystal, we can run closer to the limit. Note
# that there can be a pretty wide band where things are more or less stable.

adapter speed 500

adapter srst delay 100
if {[using_jtag]} {
   jtag_ntrst_delay 100
}

if {![using_hla]} {
   # if srst is not fitted use SYSRESETREQ to
   # perform a soft reset
   cortex_m reset_config sysresetreq
}
