X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farm926ejs%2Fcache.c;h=e86c2edd3bbfa160d22eeb224990b40e4657ae65;hb=9f5f51540d0d6af03ff22f55b7afc3fda6a4120d;hp=504f604684d5098b8048338a63ab5dae7d573b55;hpb=e390e8709149664ff96cf19384264c84573f3082;p=u-boot

diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
index 504f604684..e86c2edd3b 100644
--- a/arch/arm/cpu/arm926ejs/cache.c
+++ b/arch/arm/cpu/arm926ejs/cache.c
@@ -2,50 +2,77 @@
  * (C) Copyright 2011
  * Ilya Yanok, EmCraft Systems
  *
- * 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.
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <linux/types.h>
 #include <common.h>
 
 #ifndef CONFIG_SYS_DCACHE_OFF
-static inline void dcache_noop(void)
+
+#ifndef CONFIG_SYS_CACHELINE_SIZE
+#define CONFIG_SYS_CACHELINE_SIZE	32
+#endif
+
+void invalidate_dcache_all(void)
 {
-	if (dcache_status()) {
-		puts("WARNING: cache operations are not implemented!\n"
-		     "WARNING: disabling D-Cache now, you can re-enable it"
-		     "later with 'dcache on' command\n");
-		dcache_disable();
-	}
+	asm volatile("mcr p15, 0, %0, c7, c6, 0\n" : : "r"(0));
 }
 
-void invalidate_dcache_all(void)
+void flush_dcache_all(void)
 {
-	dcache_noop();
+	asm volatile(
+		"0:"
+		"mrc p15, 0, r15, c7, c14, 3\n"
+		"bne 0b\n"
+		"mcr p15, 0, %0, c7, c10, 4\n"
+		 : : "r"(0) : "memory"
+	);
+}
+
+static int check_cache_range(unsigned long start, unsigned long stop)
+{
+	int ok = 1;
+
+	if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
+		ok = 0;
+
+	if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
+		ok = 0;
+
+	if (!ok)
+		debug("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
+			start, stop);
+
+	return ok;
 }
 
 void invalidate_dcache_range(unsigned long start, unsigned long stop)
 {
-	dcache_noop();
+	if (!check_cache_range(start, stop))
+		return;
+
+	while (start < stop) {
+		asm volatile("mcr p15, 0, %0, c7, c6, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
 }
 
 void flush_dcache_range(unsigned long start, unsigned long stop)
 {
-	dcache_noop();
+	if (!check_cache_range(start, stop))
+		return;
+
+	while (start < stop) {
+		asm volatile("mcr p15, 0, %0, c7, c14, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
+
+	asm volatile("mcr p15, 0, %0, c7, c10, 4\n" : : "r"(0));
+}
+
+void flush_cache(unsigned long start, unsigned long size)
+{
+	flush_dcache_range(start, start + size);
 }
 #else /* #ifndef CONFIG_SYS_DCACHE_OFF */
 void invalidate_dcache_all(void)
@@ -64,7 +91,7 @@ void flush_dcache_range(unsigned long start, unsigned long stop)
 {
 }
 
-void  flush_cache(unsigned long start, unsigned long size)
+void flush_cache(unsigned long start, unsigned long size)
 {
 }
 #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
@@ -72,8 +99,7 @@ void  flush_cache(unsigned long start, unsigned long size)
 /*
  * Stub implementations for l2 cache operations
  */
-void __l2_cache_disable(void)
-{
-}
+void __l2_cache_disable(void) {}
+
 void l2_cache_disable(void)
-        __attribute__((weak, alias("__l2_cache_disable")));
+	__attribute__((weak, alias("__l2_cache_disable")));