From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/sh/mm/flush-sh4.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 arch/sh/mm/flush-sh4.c

(limited to 'arch/sh/mm/flush-sh4.c')

diff --git a/arch/sh/mm/flush-sh4.c b/arch/sh/mm/flush-sh4.c
new file mode 100644
index 00000000..0b85dd9d
--- /dev/null
+++ b/arch/sh/mm/flush-sh4.c
@@ -0,0 +1,110 @@
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/cache_insns.h>
+#include <asm/cacheflush.h>
+#include <asm/traps.h>
+
+/*
+ * Write back the dirty D-caches, but not invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+static void sh4__flush_wback_region(void *start, int size)
+{
+	reg_size_t aligned_start, v, cnt, end;
+
+	aligned_start = register_align(start);
+	v = aligned_start & ~(L1_CACHE_BYTES-1);
+	end = (aligned_start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+	cnt = (end - v) / L1_CACHE_BYTES;
+
+	while (cnt >= 8) {
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		cnt -= 8;
+	}
+
+	while (cnt) {
+		__ocbwb(v); v += L1_CACHE_BYTES;
+		cnt--;
+	}
+}
+
+/*
+ * Write back the dirty D-caches and invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+static void sh4__flush_purge_region(void *start, int size)
+{
+	reg_size_t aligned_start, v, cnt, end;
+
+	aligned_start = register_align(start);
+	v = aligned_start & ~(L1_CACHE_BYTES-1);
+	end = (aligned_start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+	cnt = (end - v) / L1_CACHE_BYTES;
+
+	while (cnt >= 8) {
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		__ocbp(v); v += L1_CACHE_BYTES;
+		cnt -= 8;
+	}
+	while (cnt) {
+		__ocbp(v); v += L1_CACHE_BYTES;
+		cnt--;
+	}
+}
+
+/*
+ * No write back please
+ */
+static void sh4__flush_invalidate_region(void *start, int size)
+{
+	reg_size_t aligned_start, v, cnt, end;
+
+	aligned_start = register_align(start);
+	v = aligned_start & ~(L1_CACHE_BYTES-1);
+	end = (aligned_start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+	cnt = (end - v) / L1_CACHE_BYTES;
+
+	while (cnt >= 8) {
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		__ocbi(v); v += L1_CACHE_BYTES;
+		cnt -= 8;
+	}
+
+	while (cnt) {
+		__ocbi(v); v += L1_CACHE_BYTES;
+		cnt--;
+	}
+}
+
+void __init sh4__flush_region_init(void)
+{
+	__flush_wback_region		= sh4__flush_wback_region;
+	__flush_invalidate_region	= sh4__flush_invalidate_region;
+	__flush_purge_region		= sh4__flush_purge_region;
+}
-- 
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