From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/mips/bmips/dma.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 arch/mips/bmips/dma.c

(limited to 'arch/mips/bmips/dma.c')

diff --git a/arch/mips/bmips/dma.c b/arch/mips/bmips/dma.c
new file mode 100644
index 000000000..3779e7855
--- /dev/null
+++ b/arch/mips/bmips/dma.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/types.h>
+#include <linux/dma-map-ops.h>
+#include <asm/bmips.h>
+#include <asm/io.h>
+
+bool bmips_rac_flush_disable;
+
+void arch_sync_dma_for_cpu_all(void)
+{
+	void __iomem *cbr = BMIPS_GET_CBR();
+	u32 cfg;
+
+	if (boot_cpu_type() != CPU_BMIPS3300 &&
+	    boot_cpu_type() != CPU_BMIPS4350 &&
+	    boot_cpu_type() != CPU_BMIPS4380)
+		return;
+
+	if (unlikely(bmips_rac_flush_disable))
+		return;
+
+	/* Flush stale data out of the readahead cache */
+	cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
+	__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
+	__raw_readl(cbr + BMIPS_RAC_CONFIG);
+}
-- 
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