#Written by: Michael Schwingen <rincewind@discworld.dascon.de>

if { [info exists CHIPNAME] } {
   set  _CHIPNAME $CHIPNAME
} else {
   set  _CHIPNAME xba_reva3
}

if { [info exists ENDIAN] } {
   set  _ENDIAN $ENDIAN
} else {
  # default to big endian
   set  _ENDIAN big
}

if { [info exists CPUTAPID ] } {
   set _CPUTAPID $CPUTAPID
} else {
  # force an error till we get a good number
   set _CPUTAPID 0xffffffff
}

reset_config trst_and_srst separate

adapter_nsrst_delay 100
jtag_ntrst_delay 100

#jtag scan chain
jtag newtap $_CHIPNAME cpu -irlen 7 -ircapture 0x1 -irmask 0x7f -expected-id $_CPUTAPID

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME xscale -endian $_ENDIAN -chain-position $_TARGETNAME -variant ixp42x

$_TARGETNAME configure -event reset-init {
	#############################################################################
	# setup expansion bus CS, disable external wdt
	#############################################################################
	mww 0xc4000000  0xbd113842  #CS0  : Flash, write enabled @0x50000000
	mww 0xc4000004  0x94d10013  #CS1
	mww 0xc4000008  0x95960003  #CS2
	mww 0xc400000c  0x00000000  #CS3
	mww 0xc4000010  0x80900003  #CS4
	mww 0xc4000014  0x9d520003  #CS5
	mww 0xc4000018  0x81860001  #CS6
	mww 0xc400001c  0x80900003  #CS7

	#############################################################################
	# init SDRAM controller: 16MB, one bank, CL3
	#############################################################################
	mww 0xCC000000  0x2A # SDRAM_CFG: 64MBit, CL3
	mww 0xCC000004     0 # disable refresh
	mww 0xCC000008     3 # NOP
	sleep 100
	mww 0xCC000004  2100 # set refresh counter
	mww 0xCC000008     2 # Precharge All Banks
	sleep 100
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     4 # Auto Refresh
	mww 0xCC000008     1 # Mode Select CL3

	#mww 0xc4000020  0xffffee # CFG0: remove expansion bus boot flash
	#mirror at 0x00000000

	#big endian
	reg XSCALE_CTRL 0xF8

	#
	# detect flash
	#
	flash probe 0
}

$_TARGETNAME configure -work-area-phys 0x20010000 -work-area-size 0x8060 -work-area-backup 0


set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME cfi 0x50000000 0x400000 2 2 $_TARGETNAME

init
reset init
# set big endian mode
reg XSCALE_CTRL 0xF8