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-rw-r--r--arch/nds32/lib/cache.c157
1 files changed, 157 insertions, 0 deletions
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;
+}
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