XCF (Xilinx platfrom flash) support.

Change-Id: I4ee6db5f0abdb9fd279cc0edd13f71952a9d295d
Signed-off-by: Uladzimir Pylinski <barthess@yandex.ru>
Reviewed-on: http://openocd.zylin.com/3914
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

tcl/cpld/xilinx-xcf-p.cfg

@@ -0,0 +1,18 @@
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME xcf
+}
+
+# IDs acquired from Xilinx's DS123.pdf
+# XCF08P <v>5057093
+# XCF16P <v>5058093
+# XCF32P <v>5059093
+# The 4 top bits (28:31) are the device revision. Ignore it.
+jtag newtap $_CHIPNAME flash -irlen 16 -ignore-version \
+	-expected-id 0x05057093 \
+	-expected-id 0x05058093 \
+	-expected-id 0x05059093
+
+target create xcf.flash testee -chain-position $_CHIPNAME.flash
+flash bank XCF_P xcf 0 0 0 0 xcf.flash