pld: add support for gowin devices

Change-Id: Idd1a09514bbbbe0a7b54d69010f6c2f91215fd1d
Signed-off-by: Daniel Anselmi <danselmi@gmx.ch>
Reviewed-on: https://review.openocd.org/c/openocd/+/7368
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/fpga/gowin_gw1n.cfg

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+#  Gowin FPGA IDCODEs
+# from JTAG Programming and Configuration Guide
+# http://cdn.gowinsemi.com.cn/TN653E.pdf
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME gw1n
+}
+
+jtag newtap $_CHIPNAME tap -irlen 8 -ignore-version \
+	-expected-id 0x0900281B \
+	-expected-id 0x0900381B \
+	-expected-id 0x0100681B \
+	-expected-id 0x0300081B \
+	-expected-id 0x0300181B \
+	-expected-id 0x0120681B \
+	-expected-id 0x0100381B \
+	-expected-id 0x1100381B \
+	-expected-id 0x0100981B \
+	-expected-id 0x1100581B \
+	-expected-id 0x1100481B \
+	-expected-id 0x0100181B \
+	-expected-id 0x1100181B \
+	-expected-id 0x0100481B
+
+pld device gowin $_CHIPNAME.tap