avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/sh/cpu/sh4/cache.c

@@ -0,0 +1,114 @@
+/*
+ * (C) Copyright 2007
+ * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+/*
+ * Jump to P2 area.
+ * When handling TLB or caches, we need to do it from P2 area.
+ */
+#define jump_to_P2()			\
+  do {					\
+    unsigned long __dummy;		\
+    __asm__ __volatile__(		\
+		"mov.l	1f, %0\n\t"	\
+		"or	%1, %0\n\t"	\
+		"jmp	@%0\n\t"	\
+		" nop\n\t"		\
+		".balign 4\n"		\
+		"1:	.long 2f\n"	\
+		"2:"			\
+		: "=&r" (__dummy)	\
+		: "r" (0x20000000));	\
+  } while (0)
+
+/*
+ * Back to P1 area.
+ */
+#define back_to_P1()					\
+  do {							\
+    unsigned long __dummy;				\
+    __asm__ __volatile__(				\
+		"nop;nop;nop;nop;nop;nop;nop\n\t"	\
+		"mov.l	1f, %0\n\t"			\
+		"jmp	@%0\n\t"			\
+		" nop\n\t"				\
+		".balign 4\n"				\
+		"1:	.long 2f\n"			\
+		"2:"					\
+		: "=&r" (__dummy));			\
+  } while (0)
+
+#define CACHE_VALID       1
+#define CACHE_UPDATED     2
+
+static inline void cache_wback_all(void)
+{
+	unsigned long addr, data, i, j;
+
+	jump_to_P2();
+	for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++){
+		for (j = 0; j < CACHE_OC_NUM_WAYS; j++) {
+			addr = CACHE_OC_ADDRESS_ARRAY | (j << CACHE_OC_WAY_SHIFT)
+				| (i << CACHE_OC_ENTRY_SHIFT);
+			data = inl(addr);
+			if (data & CACHE_UPDATED) {
+				data &= ~CACHE_UPDATED;
+				outl(data, addr);
+			}
+		}
+	}
+	back_to_P1();
+}
+
+
+#define CACHE_ENABLE      0
+#define CACHE_DISABLE     1
+
+int cache_control(unsigned int cmd)
+{
+	unsigned long ccr;
+
+	jump_to_P2();
+	ccr = inl(CCR);
+
+	if (ccr & CCR_CACHE_ENABLE)
+		cache_wback_all();
+
+	if (cmd == CACHE_DISABLE)
+		outl(CCR_CACHE_STOP, CCR);
+	else
+		outl(CCR_CACHE_INIT, CCR);
+	back_to_P1();
+
+	return 0;
+}
+
+void flush_dcache_range(unsigned long start, unsigned long end)
+{
+	u32 v;
+
+	start &= ~(L1_CACHE_BYTES - 1);
+	for (v = start; v < end; v += L1_CACHE_BYTES) {
+		asm volatile ("ocbwb     %0" :	/* no output */
+			      : "m" (__m(v)));
+	}
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long end)
+{
+	u32 v;
+
+	start &= ~(L1_CACHE_BYTES - 1);
+	for (v = start; v < end; v += L1_CACHE_BYTES) {
+		asm volatile ("ocbi     %0" :	/* no output */
+			      : "m" (__m(v)));
+	}
+}