sh: Add support SH2/SH2A which is CPU of Renesas Technology

Add support SH2/SH2A basic function.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/cpu/sh2/cache.c b/cpu/sh2/cache.c
new file mode 100644
index 0000000..b5c47cf
--- /dev/null
+++ b/cpu/sh2/cache.c
@@ -0,0 +1,112 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * Copyright (C) 2007, 2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * Copyright (C) 2008 Renesas Solutions Corp.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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;
+}