generalplus: Add configuration file for General Plus GP326XXXA series

Add configuration file for General Plus GP326XXXA series. Tested on
GP326833A on GPC-1737B board.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Change-Id: I1ad0e22598b01317bbc823870a7a262e9192c595
Reviewed-on: http://openocd.zylin.com/2058
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

1 files changed, 94 insertions, 0 deletions

diff --git a/tcl/target/gp326xxxa.cfg b/tcl/target/gp326xxxa.cfg
new file mode 100644
index 0000000..e801cc8
--- /dev/null
+++ b/tcl/target/gp326xxxa.cfg
@@ -0,0 +1,94 @@
+#
+# Support for General Plus GP326XXXA chips
+#
+
+if { [info exists CHIPNAME] } {
+   set _CHIPNAME $CHIPNAME
+} else {
+   set _CHIPNAME gp326xxxa
+}
+
+if { [info exists ENDIAN] } {
+   set _ENDIAN $ENDIAN
+} else {
+   set _ENDIAN little
+}
+
+if { [info exists CPUTAPID] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x4f1f0f0f
+}
+
+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 $_TARGETNAME -variant arm7tdmi
+
+# Use internal SRAM as a work area
+$_TARGETNAME configure -work-area-phys 0xf8000000 -work-area-size 0x8000 -work-area-backup 0
+
+# The chip has both lines connected together
+reset_config trst_and_srst srst_pulls_trst
+# This delay is needed otherwise communication with the target would
+# be unreliable
+adapter_nsrst_delay 100
+
+# Set the adapter speed ridiculously low just in case we are
+# running off of a 32kHz clock
+adapter_khz 2
+
+proc gp32xxxa_halt_and_reset_control_registers {} {
+	# System control registers
+	set P_SYSTEM_CTRL_NEW       0xD0000008
+	set P_SYSTEM_CTRL           0xD000000C
+	set P_SYSTEM_CLK_EN0        0xD0000010
+	set P_SYSTEM_CLK_EN1        0xD0000014
+	set P_SYSTEM_RESET_FLAG     0xD0000018
+	set P_SYSTEM_CLK_CTRL       0xD000001C
+	set P_SYSTEM_LVR_CTRL       0xD0000020
+	set P_SYSTEM_WATCHDOG_CTRL  0xD0000024
+	set P_SYSTEM_PLLEN          0xD000005C
+
+	# Since we can't use SRST without pulling TRST
+	# we can't assume the state of the clock configuration
+	# or watchdog settings. So reset them before porceeding
+
+	# Set the adapter speed ridiculously low just in case we are
+	# running off of a 32kHz clock
+	adapter_khz 2
+
+	# Disable any advanced features at this stage
+	arm7_9 dcc_downloads disable
+	arm7_9 fast_memory_access disable
+
+	# Do a "soft reset"
+	soft_reset_halt
+	# Reset all system control registers to their default "after-reset" values
+	mwh $P_SYSTEM_WATCHDOG_CTRL  0x0000
+	mwh $P_SYSTEM_LVR_CTRL       0x0000
+
+	mwh $P_SYSTEM_CTRL_NEW       0x0001
+	mwh $P_SYSTEM_CTRL           0x0001
+	# Clear all reset flags by writing 1's
+	mwh $P_SYSTEM_RESET_FLAG     0x001C
+
+	mwh $P_SYSTEM_CLK_CTRL       0x8000
+	mwh $P_SYSTEM_CLK_EN0        0xFFFF
+	mwh $P_SYSTEM_CLK_EN1        0xFFFF
+	mwh $P_SYSTEM_PLLEN          0x0010
+
+	# Unfortunately there's no register that would allow us to
+	# know if PLL is locked. So just wait for 100ms in hopes that
+	# it would be enough.
+	sleep 100
+
+	# Now that we know that we are running at 48Mhz
+	# Increase JTAG speed and enable speed optimization features
+	adapter_khz 5000
+	arm7_9 dcc_downloads enable
+	arm7_9 fast_memory_access enable
+}
+
+$_TARGETNAME configure -event reset-end { gp32xxxa_halt_and_reset_control_registers }