tcl/target: add BCM2836 configuration file

The Broadcom chip used in the Raspberry Pi 2 Model B

Partial information is available in raspberry pi website:
https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836

Change-Id: I50b040db213c5b72f63d5f5534c552426c7376f9
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/6068
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/target/bcm2836.cfg

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# The Broadcom chip used in the Raspberry Pi 2 Model B
+
+# Partial information is available in raspberry pi website:
+# https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836
+
+if { [info exists CHIPNAME] } {
+	set  _CHIPNAME $CHIPNAME
+} else {
+	set  _CHIPNAME bcm2836
+}
+
+if { [info exists CHIPCORES] } {
+	set _cores $CHIPCORES
+} else {
+	set _cores 4
+}
+
+if { [info exists USE_SMP] } {
+	set _USE_SMP $USE_SMP
+} else {
+	set _USE_SMP 0
+}
+
+if { [info exists DAP_TAPID] } {
+	set _DAP_TAPID $DAP_TAPID
+} else {
+	set _DAP_TAPID 0x4ba00477
+}
+
+jtag newtap $_CHIPNAME cpu -expected-id $_DAP_TAPID -irlen 4
+adapter speed 4000
+
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+# MEM-AP for direct access
+target create $_CHIPNAME.ap mem_ap -dap $_CHIPNAME.dap -ap-num 0
+
+# these addresses are obtained from the ROM table via 'dap info 0' command
+set _DBGBASE {0x80010000 0x80012000 0x80014000 0x80016000}
+
+set _smp_command "target smp"
+
+for { set _core 0 } { $_core < $_cores } { incr _core } {
+	set _TARGETNAME $_CHIPNAME.cpu$_core
+
+	target create $_TARGETNAME cortex_a -dap $_CHIPNAME.dap -coreid $_core -dbgbase [lindex $_DBGBASE $_core]
+	$_TARGETNAME configure -event reset-assert-post { cortex_a dbginit }
+
+	set _smp_command "$_smp_command $_CHIPNAME.cpu$_core"
+}
+
+if {$_USE_SMP} {
+	eval $_smp_command
+}
+
+# default target is cpu0
+targets $_CHIPNAME.cpu0