at91sam9260: use RCLK

It might be possible to get this target going without
RCLK, but it would require more careful analysis and
usage of the reset events.

Enable fast memory accesses.

Tested on an at91sam9260 custom board w/external DRAM
and flash.

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

tcl/target/at91sam9260_ext_RAM_ext_flash.cfg

@@ -1,8 +1,4 @@
-
-
-
-adapter_khz 4
-
+jtag_rclk 4
 
 ######################################
 # Target:    Atmel AT91SAM9260
@@ -44,26 +40,29 @@ jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CP
 set _TARGETNAME $_CHIPNAME.cpu
 target create $_TARGETNAME arm926ejs -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm926ejs
 
-$_TARGETNAME invoke-event halted
-
 # Internal sram1 memory
 $_TARGETNAME configure -work-area-phys 0x00300000 -work-area-size 0x1000 -work-area-backup 1
 
 scan_chain
-$_TARGETNAME configure -event reset-deassert-post {at91sam_init}
+$_TARGETNAME configure -event reset-start {
+	# at reset chip runs at 32khz
+	jtag_rclk 8
+}
 
+$_TARGETNAME configure -event reset-init {at91sam_init}
 
 # Flash configuration
 #flash bank <name> cfi <base> <size> <chip width> <bus width> <target>
 set _FLASHNAME $_CHIPNAME.flash
 flash bank $_FLASHNAME cfi 0x10000000 0x01000000 2 2 $_TARGETNAME
 
+# Faster memory downloads. This is disabled automatically during
+# reset init since all reset init sequences are too short for
+# fast memory access
+arm7_9 dcc_downloads enable     
+arm7_9 fast_memory_access enable
 
 proc at91sam_init { } {
-
-	# at reset chip runs at 32khz
-	adapter_khz 8
-	halt
 	mww 0xfffffd08 0xa5000501         # RSTC_MR : enable user reset
 	mww 0xfffffd44 0x00008000         # WDT_MR : disable watchdog
 
@@ -79,16 +78,13 @@ proc at91sam_init { } {
 	sleep 10                          # wait 10 ms
 
 	# Now run at anything fast... ie: 10mhz!
-	adapter_khz 10000                    # Increase JTAG Speed to 6 MHz
-	arm7_9 dcc_downloads enable       # Enable faster DCC downloads
+	jtag_rclk 10000                    # Increase JTAG Speed to 6 MHz
 
 	mww 0xffffec00 0x0a0a0a0a         # SMC_SETUP0 : Setup SMC for Intel NOR Flash JS28F128P30T85 128MBit
 	mww 0xffffec04 0x0b0b0b0b         # SMC_PULSE0
 	mww 0xffffec08 0x00160016         # SMC_CYCLE0
 	mww 0xffffec0c 0x00161003         # SMC_MODE0
 
-	flash probe 0                     # Identify flash bank 0
-
 	mww 0xfffff870 0xffff0000         # PIO_ASR : Select peripheral function for D15..D31
 	mww 0xfffff804 0xffff0000         # PIO_PDR : Disable PIO function for D15..D31
 
@@ -123,6 +119,3 @@ proc at91sam_init { } {
 	mww 0x20000000 0
 	mww 0xffffea04 0x5d2              # SDRAMC_TR : Set refresh timer count to 15us
 }
-
-
-