ARM: uniphier: support prefetch and touch operations for outer cache

The UniPhier outer cache (L2 cache on ARMv7 SoCs) can be used as
SRAM by locking ways.

These functions will be used to transfer the trampoline code for SMP
into the locked SRAM.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/arm32/cache-uniphier.c

@@ -12,12 +12,13 @@
 #include <asm/armv7.h>
 #include <asm/processor.h>
 
+#include "cache-uniphier.h"
 #include "ssc-regs.h"
 
 #define UNIPHIER_SSCOQAD_IS_NEEDED(op) \
 		((op & UNIPHIER_SSCOQM_S_MASK) == UNIPHIER_SSCOQM_S_RANGE)
-
-#ifdef CONFIG_UNIPHIER_L2CACHE_ON
+#define UNIPHIER_SSCOQWM_IS_NEEDED(op) \
+		((op & UNIPHIER_SSCOQM_TID_MASK) == UNIPHIER_SSCOQM_TID_WAY)
 
 /* uniphier_cache_sync - perform a sync point for a particular cache level */
 static void uniphier_cache_sync(void)
@@ -33,9 +34,11 @@ static void uniphier_cache_sync(void)
  *
  * @start: start address of range operation (don't care for "all" operation)
  * @size: data size of range operation (don't care for "all" operation)
+ * @ways: target ways (don't care for operations other than pre-fetch, touch
  * @operation: flags to specify the desired cache operation
  */
-static void uniphier_cache_maint_common(u32 start, u32 size, u32 operation)
+static void uniphier_cache_maint_common(u32 start, u32 size, u32 ways,
+					u32 operation)
 {
 	/* clear the complete notification flag */
 	writel(UNIPHIER_SSCOLPQS_EF, UNIPHIER_SSCOLPQS);
@@ -49,6 +52,10 @@ static void uniphier_cache_maint_common(u32 start, u32 size, u32 operation)
 			writel(start, UNIPHIER_SSCOQAD);
 			writel(size, UNIPHIER_SSCOQSZ);
 		}
+
+		/* set target ways if needed */
+		if (unlikely(UNIPHIER_SSCOQWM_IS_NEEDED(operation)))
+			writel(ways, UNIPHIER_SSCOQWN);
 	} while (unlikely(readl(UNIPHIER_SSCOPPQSEF) &
 			  (UNIPHIER_SSCOPPQSEF_FE | UNIPHIER_SSCOPPQSEF_OE)));
 
@@ -59,12 +66,13 @@ static void uniphier_cache_maint_common(u32 start, u32 size, u32 operation)
 
 static void uniphier_cache_maint_all(u32 operation)
 {
-	uniphier_cache_maint_common(0, 0, UNIPHIER_SSCOQM_S_ALL | operation);
+	uniphier_cache_maint_common(0, 0, 0, UNIPHIER_SSCOQM_S_ALL | operation);
 
 	uniphier_cache_sync();
 }
 
-static void uniphier_cache_maint_range(u32 start, u32 end, u32 operation)
+static void uniphier_cache_maint_range(u32 start, u32 end, u32 ways,
+				       u32 operation)
 {
 	u32 size;
 
@@ -91,7 +99,7 @@ static void uniphier_cache_maint_range(u32 start, u32 end, u32 operation)
 	while (size) {
 		u32 chunk_size = min_t(u32, size, UNIPHIER_SSC_RANGE_OP_MAX_SIZE);
 
-		uniphier_cache_maint_common(start, chunk_size,
+		uniphier_cache_maint_common(start, chunk_size, ways,
 					    UNIPHIER_SSCOQM_S_RANGE | operation);
 
 		start += chunk_size;
@@ -101,6 +109,28 @@ static void uniphier_cache_maint_range(u32 start, u32 end, u32 operation)
 	uniphier_cache_sync();
 }
 
+void uniphier_cache_prefetch_range(u32 start, u32 end, u32 ways)
+{
+	uniphier_cache_maint_range(start, end, ways,
+				   UNIPHIER_SSCOQM_TID_WAY |
+				   UNIPHIER_SSCOQM_CM_PREFETCH);
+}
+
+void uniphier_cache_touch_range(u32 start, u32 end, u32 ways)
+{
+	uniphier_cache_maint_range(start, end, ways,
+				   UNIPHIER_SSCOQM_TID_WAY |
+				   UNIPHIER_SSCOQM_CM_TOUCH);
+}
+
+void uniphier_cache_touch_zero_range(u32 start, u32 end, u32 ways)
+{
+	uniphier_cache_maint_range(start, end, ways,
+				   UNIPHIER_SSCOQM_TID_WAY |
+				   UNIPHIER_SSCOQM_CM_TOUCH_ZERO);
+}
+
+#ifdef CONFIG_UNIPHIER_L2CACHE_ON
 void v7_outer_cache_flush_all(void)
 {
 	uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_FLUSH);
@@ -113,14 +143,14 @@ void v7_outer_cache_inval_all(void)
 
 void v7_outer_cache_flush_range(u32 start, u32 end)
 {
-	uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_FLUSH);
+	uniphier_cache_maint_range(start, end, 0, UNIPHIER_SSCOQM_CM_FLUSH);
 }
 
 void v7_outer_cache_inval_range(u32 start, u32 end)
 {
 	if (start & (UNIPHIER_SSC_LINE_SIZE - 1)) {
 		start &= ~(UNIPHIER_SSC_LINE_SIZE - 1);
-		uniphier_cache_maint_range(start, UNIPHIER_SSC_LINE_SIZE,
+		uniphier_cache_maint_range(start, UNIPHIER_SSC_LINE_SIZE, 0,
 					   UNIPHIER_SSCOQM_CM_FLUSH);
 		start += UNIPHIER_SSC_LINE_SIZE;
 	}
@@ -132,7 +162,7 @@ void v7_outer_cache_inval_range(u32 start, u32 end)
 
 	if (end & (UNIPHIER_SSC_LINE_SIZE - 1)) {
 		end &= ~(UNIPHIER_SSC_LINE_SIZE - 1);
-		uniphier_cache_maint_range(end, UNIPHIER_SSC_LINE_SIZE,
+		uniphier_cache_maint_range(end, UNIPHIER_SSC_LINE_SIZE, 0,
 					   UNIPHIER_SSCOQM_CM_FLUSH);
 	}
 
@@ -141,7 +171,7 @@ void v7_outer_cache_inval_range(u32 start, u32 end)
 		return;
 	}
 
-	uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_INV);
+	uniphier_cache_maint_range(start, end, 0, UNIPHIER_SSCOQM_CM_INV);
 }
 
 void v7_outer_cache_enable(void)

arch/arm/mach-uniphier/arm32/cache-uniphier.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CACHE_UNIPHIER_H
+#define __CACHE_UNIPHIER_H
+
+#include <linux/types.h>
+
+void uniphier_cache_prefetch_range(u32 start, u32 end, u32 ways);
+void uniphier_cache_touch_range(u32 start, u32 end, u32 ways);
+void uniphier_cache_touch_zero_range(u32 start, u32 end, u32 ways);
+
+#endif /* __CACHE_UNIPHIER_H */