jtag: basic support for P&E Micro OSBDM (aka OSJTAG) adapter

This driver provides support for the P&E Micro OSBDM adapter (sometimes
named as OSJTAG), mounted on the Freescale TWRK60N512 bord. Thus, it
provides a quick start when working with this board. The driver doesn't
use BDM commands, but work with OSBDM adapter using only JTAG commands.

Change-Id: Ibc3779538e666e07651d3136431e5d44344f3b07
Signed-off-by: Jan Dakinevich <jan.dakinevich@gmail.com>
Reviewed-on: http://openocd.zylin.com/492
Tested-by: jenkins
Reviewed-by: Tomas Frydrych <tf+openocd@r-finger.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

configure.ac

@@ -478,6 +478,10 @@ AC_ARG_ENABLE([stlink],
   AS_HELP_STRING([--enable-stlink], [Enable building support for the ST-Link JTAG Programmer]),
   [build_stlink=$enableval], [build_stlink=no])
 
+AC_ARG_ENABLE([osbdm],
+  AS_HELP_STRING([--enable-osbdm], [Enable building support for the OSBDM (JTAG only) Programmer]),
+  [build_osbdm=$enableval], [build_osbdm=no])
+
 AC_ARG_ENABLE([minidriver_dummy],
   AS_HELP_STRING([--enable-minidriver-dummy], [Enable the dummy minidriver.]),
   [build_minidriver_dummy=$enableval], [build_minidriver_dummy=no])
@@ -783,6 +787,12 @@ else
   AC_DEFINE(BUILD_STLINK, 0, [0 if you don't want the ST-Link JTAG driver.])
 fi
 
+if test $build_osbdm = yes; then
+  AC_DEFINE(BUILD_OSBDM, 1, [1 if you want the OSBDM driver.])
+else
+  AC_DEFINE(BUILD_OSBDM, 0, [0 if you don't want the OSBDM driver.])
+fi
+
 if test "$use_internal_jimtcl" = yes; then
   if test -f "$srcdir/jimtcl/configure.ac"; then
     AX_CONFIG_SUBDIR_OPTION([jimtcl], [--disable-install-jim])
@@ -1069,7 +1079,7 @@ fi
 
 # Check for libusb1 ported drivers.
 build_usb_ng=no
-if test $build_jlink = yes -o $build_stlink = yes; then
+if test $build_jlink = yes -o $build_stlink = yes -o $build_osbdm = yes; then
   build_usb_ng=yes
 fi
 
@@ -1118,6 +1128,7 @@ AM_CONDITIONAL([ARMJTAGEW], [test $build_armjtagew = yes])
 AM_CONDITIONAL([REMOTE_BITBANG], [test $build_remote_bitbang = yes])
 AM_CONDITIONAL([BUSPIRATE], [test $build_buspirate = yes])
 AM_CONDITIONAL([STLINK], [test $build_stlink = yes])
+AM_CONDITIONAL([OSBDM], [test $build_osbdm = yes])
 AM_CONDITIONAL([USB], [test $build_usb = yes])
 AM_CONDITIONAL([USB_NG], [test $build_usb_ng = yes])
 AM_CONDITIONAL([USE_LIBUSB0], [test $use_libusb0 = yes])

src/jtag/drivers/Makefile.am

@@ -98,6 +98,9 @@ endif
 if STLINK
 DRIVERFILES += stlink_usb.c
 endif
+if OSBDM
+DRIVERFILES += osbdm.c
+endif
 
 noinst_HEADERS = \
 	bitbang.h \

src/jtag/interfaces.c

@@ -104,6 +104,9 @@ extern struct jtag_interface remote_bitbang_interface;
 #if BUILD_STLINK == 1
 extern struct jtag_interface stlink_interface;
 #endif
+#if BUILD_OSBDM == 1
+extern struct jtag_interface osbdm_interface;
+#endif
 #endif /* standard drivers */
 
 /**
@@ -176,6 +179,9 @@ struct jtag_interface *jtag_interfaces[] = {
 #if BUILD_STLINK == 1
 		&stlink_interface,
 #endif
+#if BUILD_OSBDM == 1
+		&osbdm_interface,
+#endif
 #endif /* standard drivers */
 		NULL,
 	};

tcl/board/twr-k60n512.cfg

@@ -1,10 +1,12 @@
 #
-# Freescale KwikStik development board
+# Freescale TWRK60N512 development board
 #
 
 source [find target/k60.cfg]
 
-reset_config trst_and_srst
+$_TARGETNAME configure -event reset-init {
+	puts "-event reset-init occured"
+}
 
 #
 # Bank definition for the 'program flash' (instructions and/or data)

tcl/interface/osbdm.cfg

@@ -0,0 +1,12 @@
+#
+# P&E Micro OSBDM (aka OSJTAG) interface
+#
+# http://pemicro.com/osbdm/
+#
+interface osbdm
+reset_config srst_only
+
+#
+# OSBDM doesn't support speed control
+#
+adapter_khz 1