board: added at91cap7a stk w/sdram config scripts

The strange thing here with this board is that 16MHz kinda
works, but only 2MHz is really stable.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

tcl/board/at91cap7a-stk-sdram.cfg

@@ -0,0 +1,165 @@
+# http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4394
+#
+# use combined on interfaces or targets that can't set TRST/SRST separately
+reset_config trst_and_srst srst_pulls_trst
+
+if { [info exists CHIPNAME] } {
+   set  _CHIPNAME $CHIPNAME
+} else {
+   set  _CHIPNAME cap7
+}
+
+if { [info exists ENDIAN] } {
+   set  _ENDIAN $ENDIAN
+} else {
+   set  _ENDIAN little
+}
+
+if { [info exists CPUTAPID ] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x40700f0f
+}
+
+jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME arm7tdmi -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm7tdmi
+
+$_TARGETNAME configure -event reset-start {
+	# start off real slow when we're running off internal RC oscillator
+	jtag_khz 10
+}
+
+proc peek32 {address} {
+	ocd_mem2array t 32 $address 1
+	return $t(0)
+}
+
+# Wait for an expression to be true with a timeout
+proc wait_state {expression} {
+	for {set i 0} {$i < 1000} {set i [expr $i + 1]} {
+		if {[uplevel 1 $expression] == 0} {
+			return
+		}
+	}
+	return -code 1 "Timed out"	
+}
+
+# Use a global variable here to be able to tinker interactively with
+# post reset jtag frequency.
+global post_reset_khz
+# Danger!!!! Even 16MHz kinda works with this target, but 
+# it needs to be as low as 2000kHz to be stable.
+set post_reset_khz 2000
+
+$_TARGETNAME configure -event reset-init {
+	echo "Configuring master clock"
+	# disable watchdog
+	mww 0xfffffd44 0xff008000
+	# enable user reset
+	mww 0xfffffd08 0xa5000001
+	# Enable main oscillator
+	mww 0xFFFFFc20  0x00000f01
+	wait_state {expr {([peek32 0xFFFFFC68] & 0x1) == 0}}  
+
+	# Set PLLA to 96MHz
+	mww 0xFFFFFc28 0x20072801
+	wait_state {expr {([peek32 0xFFFFFC68] & 0x2) == 0}}  
+
+	# Select prescaler
+	mww 0xFFFFFC30 0x00000004
+	wait_state {expr {([peek32 0xFFFFFC68] & 0x8) == 0}}  
+
+	# Select master clock to 48MHz
+	mww 0xFFFFFC30 0x00000006
+	wait_state {expr {([peek32 0xFFFFFC68] & 0x8) == 0}}  
+
+	echo "Master clock ok."
+	echo "Configuring the SDRAM controller..."
+
+	# Configure EBI Chip select for SDRAM
+	mww 0xFFFFEF30 0x00000102
+
+	# Enable clock on EBI PIOs
+	mww 0xFFFFFC10 0x00000004
+
+	# Configure PIO for SDRAM
+	mww 0xFFFFF470 0xFFFF0000
+	mww 0xFFFFF474 0x00000000
+	mww 0xFFFFF404 0xFFFF0000
+
+	# Configure SDRAMC CR
+	mww 0xFFFFEA08 0xA63392F9
+ 
+	# NOP command
+	mww 0xFFFFEA00 0x1
+	mww 0x20000000 0
+
+	# Precharge All Banks command
+	mww 0xFFFFEA00 0x2
+	mww 0x20000000 0
+
+	# Set 1st CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000010 0x00000001
+
+	# Set 2nd CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000020 0x00000002
+
+	# Set 3rd CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000030 0x00000003
+
+	# Set 4th CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000040 0x00000004
+
+	# Set 5th CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000050 0x00000005
+
+	# Set 6th CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000060 0x00000006
+
+	# Set 7th CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000070 0x00000007
+
+	# Set 8th CBR
+	mww 0xFFFFEA00 0x00000004
+	mww 0x20000080 0x00000008
+
+	# Set LMR operation
+	mww 0xFFFFEA00 0x00000003
+
+	# Perform LMR burst=1, lat=2
+	mww 0x20000020 0xCAFEDEDE
+
+	# Set Refresh Timer
+	mww 0xFFFFEA04 0x00000203
+
+	# Set Normal mode
+	mww 0xFFFFEA00 0x00000000
+	mww 0x20000000 0x00000000
+
+	#remap internal memory at address 0x0
+	mww 0xffffef00 0x3
+	
+	echo "SDRAM configuration ok."
+
+	# Now that we're up and running, crank up speed!
+	global post_reset_khz
+	jtag_khz $post_reset_khz
+}
+
+$_TARGETNAME configure -work-area-phys 0x00200000 -work-area-size 0x4000 -work-area-backup 0
+
+arm7_9 dcc_downloads enable
+arm7_9 fast_memory_access enable
+
+#set _FLASHNAME $_CHIPNAME.flash
+#flash bank $_FLASHNAME at91sam7 0 0 0 0 $_TARGETNAME 0 0 0 0 0 0 0 18432
+