flash/nor: flash driver and cfg for SAM E54, E53, E51 and D51

The new Microchip (former Atmel) series powered by Cortex-M4 looks
very similar to older M0+ powered SAM D2x at the first sight.
Unfortunately the new series differs a lot in important details.
NVMCTRL has different register addresses, moved important bits
and even changed binary command set. An universal driver for all SAM D/E
would be very complicated. That's why a new driver was derived.

Tested on Microchip SAM E54 Xplained Pro kit (board cfg included).

Adjusted for the restructured dap support.
Checked by valgrind and clang static analyzer.

Change-Id: I26c67047a552076f4b207b9b89285a53d69b4ca4
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4272
Tested-by: jenkins
Reviewed-by: Andres Vahter <andres.vahter@gmail.com>

2 files changed, 88 insertions, 0 deletions

diff --git a/tcl/board/microchip_same54_xplained_pro.cfg b/tcl/board/microchip_same54_xplained_pro.cfg
new file mode 100644
index 0000000..db8a856
--- /dev/null
+++ b/tcl/board/microchip_same54_xplained_pro.cfg
@@ -0,0 +1,13 @@
+#
+# Microchip (former Atmel) SAM E54 Xplained Pro evaluation kit.
+# http://www.microchip.com/developmenttools/productdetails.aspx?partno=atsame54-xpro
+#
+
+source [find interface/cmsis-dap.cfg]
+
+set CHIPNAME same54
+
+source [find target/atsame5x.cfg]
+
+reset_config srst_only
+
diff --git a/tcl/target/atsame5x.cfg b/tcl/target/atsame5x.cfg
new file mode 100644
index 0000000..61949cf
--- /dev/null
+++ b/tcl/target/atsame5x.cfg
@@ -0,0 +1,75 @@
+#
+# Microchip (former Atmel) SAM E54, E53, E51 and D51 devices
+# with a Cortex-M4 core
+#
+
+#
+# Devices only support SWD transports.
+#
+source [find target/swj-dp.tcl]
+
+if { [info exists CHIPNAME] } {
+   set _CHIPNAME $CHIPNAME
+} else {
+   set _CHIPNAME atsame5
+}
+
+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 32kB (the smallest RAM size is 128kB)
+if { [info exists WORKAREASIZE] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x8000
+}
+
+if { [info exists CPUTAPID] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x4ba00477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+# SAM DSU will hold the CPU in reset if TCK is low when RESET_N
+# deasserts
+#
+# dsu_reset_deassert configures whether we want to run or halt out of reset,
+# then instruct the DSU to let us out of reset.
+$_TARGETNAME configure -event reset-deassert-post {
+        atsame5 dsu_reset_deassert
+}
+
+# SRST (wired to RESET_N) resets debug circuitry
+# srst_pulls_trst is not configured here to avoid an error raised in reset halt
+reset_config srst_gates_jtag
+
+# Do not use a reset button with other SWD adapter than Atmel's EDBG.
+# DSU usually locks MCU in reset state until you issue a reset command
+# in OpenOCD.
+
+# SAM E5x/D51 runs at SYSCLK = 48 MHz from RC oscillator after reset.
+# Atmel's EDBG (on-board cmsis-dap adapter of Xplained kits) works
+# without problem at clock speed over 5000 khz. Atmel recommends
+# adapter speed less than 10 * CPU clock.
+adapter_khz 2000
+
+if {![using_hla]} {
+   # if srst is not fitted use SYSRESETREQ to
+   # perform a soft reset
+   cortex_m reset_config sysresetreq
+}
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME atsame5 0x00000000 0 1 1 $_TARGETNAME