nds32: split common cache access from cpu into lib

This commit does the following updates.
1. Split the common cache access from cpu.c into lib folder.
2. Rename the following cache api to adapt common.h
 - dcache_flush_rang -> flush_dcache_rang
 - icache_inval_range -> invalidate_icache_range
3. Add invalidate_dcache_range

Signed-off-by: Macpaul Lin <macpaul@gmail.com>

2 files changed, 158 insertions, 1 deletions

diff --git a/arch/nds32/lib/Makefile b/arch/nds32/lib/Makefile
index e5c31c3..581a2e7 100644
--- a/arch/nds32/lib/Makefile
+++ b/arch/nds32/lib/Makefile
@@ -29,7 +29,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(ARCH).o
 
-OBJS	:= board.o bootm.o interrupts.o
+OBJS	:= board.o bootm.o cache.o interrupts.o
 
 all:	$(LIB)
 
diff --git a/arch/nds32/lib/cache.c b/arch/nds32/lib/cache.c
new file mode 100644
index 0000000..0f1a886
--- /dev/null
+++ b/arch/nds32/lib/cache.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2012 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * 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>
+
+static inline unsigned long CACHE_LINE_SIZE(enum cache_t cache)
+{
+	if (cache == ICACHE)
+		return 8 << (((GET_ICM_CFG() & ICM_CFG_MSK_ISZ) \
+					>> ICM_CFG_OFF_ISZ) - 1);
+	else
+		return 8 << (((GET_DCM_CFG() & DCM_CFG_MSK_DSZ) \
+					>> DCM_CFG_OFF_DSZ) - 1);
+}
+
+void flush_dcache_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = CACHE_LINE_SIZE(DCACHE);
+
+	while (end > start) {
+		asm volatile (
+			"\n\tcctl %0, L1D_VA_WB"
+			"\n\tcctl %0, L1D_VA_INVAL"
+			:
+			: "r" (start)
+		);
+		start += line_size;
+	}
+}
+
+void invalidate_icache_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = CACHE_LINE_SIZE(ICACHE);
+	while (end > start) {
+		asm volatile (
+			"\n\tcctl %0, L1I_VA_INVAL"
+			:
+			: "r"(start)
+		);
+		start += line_size;
+	}
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = CACHE_LINE_SIZE(DCACHE);
+	while (end > start) {
+		asm volatile (
+			"\n\tcctl %0, L1D_VA_INVAL"
+			:
+			: "r"(start)
+		);
+		start += line_size;
+	}
+}
+
+void flush_cache(unsigned long addr, unsigned long size)
+{
+	flush_dcache_range(addr, addr + size);
+	invalidate_icache_range(addr, addr + size);
+}
+
+void icache_enable(void)
+{
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"ori	$p0, $p0, 0x01\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+void icache_disable(void)
+{
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"li	$p1, ~0x01\n\t"
+		"and	$p0, $p0, $p1\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+int icache_status(void)
+{
+	int ret;
+
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"andi	%0,  $p0, 0x01\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	);
+
+	return ret;
+}
+
+void dcache_enable(void)
+{
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"ori	$p0, $p0, 0x02\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+void dcache_disable(void)
+{
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"li	$p1, ~0x02\n\t"
+		"and	$p0, $p0, $p1\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+int dcache_status(void)
+{
+	int ret;
+
+	asm volatile (
+		"mfsr	$p0, $mr8\n\t"
+		"andi	%0, $p0, 0x02\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	);
+
+	return ret;
+}