fw: Import tkey-libs fw-2

This is an import of the fw-2 tag of tkey-libs.

We import the entire tkey-libs repo minus dot files into the
tillitis-key1 repo to make it very simple not to make mistakes
regarding which firmware tag depends on which tkey-libs tag,
especially considering locking down with NVCM.

Please see README for information about developing with another
tkey-libs or how to import future tkey-libs.

Since tkey-libs is now a part of the repo we also add tkey-libs to the
clean_fw target.

hw/application_fpga/tkey-libs/example-app/Makefile

@@ -0,0 +1,33 @@
+P := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
+LIBDIR ?= $(P)/../
+OBJCOPY ?= llvm-objcopy
+CC = clang
+
+# If you want debug_puts() etcetera to output something on our QEMU
+# debug port, use -DQEMU_DEBUG below, or -DTKEY_DEBUG to use Tkeys USB debug pipe
+CFLAGS = -g -target riscv32-unknown-none-elf -march=rv32iczmmul -mabi=ilp32 -mcmodel=medany \
+   -static -std=gnu99 -O2 -ffast-math -fno-common -fno-builtin-printf \
+   -fno-builtin-putchar -nostdlib -mno-relax -flto \
+   -Wall -Werror=implicit-function-declaration \
+   -I $(LIBDIR)/include -I $(LIBDIR)
+   # -DQEMU_DEBUG -DTKEY_DEBUG
+
+INCLUDE=$(LIBDIR)/include
+
+LDFLAGS=-T $(LIBDIR)/app.lds -L $(LIBDIR) -lcommon -lcrt0
+
+.PHONY: all
+all: blue.bin
+
+# Turn elf into bin for device
+%.bin: %.elf
+	$(OBJCOPY) --input-target=elf32-littleriscv --output-target=binary $^ $@
+	chmod a-x $@
+
+BLUEOBJS=blue.o
+blue.elf: blue.o
+	$(CC) $(CFLAGS) $(BLUEOBJS) $(LDFLAGS) -I $(LIBDIR) -o $@
+
+.PHONY: clean
+clean:
+	rm -f blue.bin blue.elf $(BLUEOBJS)

hw/application_fpga/tkey-libs/example-app/blue.c

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2023 Tillitis AB <tillitis.se>
+// SPDX-License-Identifier: BSD-2-Clause
+
+#include <stdint.h>
+#include <tkey/led.h>
+#include <tkey/tk1_mem.h>
+#include <tkey/debug.h>
+
+#define SLEEPTIME 100000
+
+void sleep(uint32_t n)
+{
+	for (volatile int i = 0; i < n; i++);
+}
+
+int main(void)
+{
+	debug_puts("Hello, world!\n");
+	debug_puts("Going to sleep between blinks: ");
+	debug_putinthex(SLEEPTIME);
+	debug_lf();
+
+	for (;;) {
+		led_set(LED_RED);
+		sleep(SLEEPTIME);
+		led_set(LED_GREEN);
+		sleep(SLEEPTIME);
+		led_set(LED_BLUE);
+		sleep(SLEEPTIME);
+	}
+}