linux-kernel - [PATCH 07/14] MIPS: OCTEON: Implement the core-16057 workaround

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Message-Id: <1418666603-15159-8-git-send-email-aleksey.makarov@auriga.com>
Date:	Mon, 15 Dec 2014 21:03:13 +0300
From:	Aleksey Makarov <feumilieu@...il.com>
To:	linux-mips@...ux-mips.org
Cc:	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>,
	Aleksey Makarov <aleksey.makarov@...iga.com>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 07/14] MIPS: OCTEON: Implement the core-16057 workaround

From: David Daney <david.daney@...ium.com>

Disable ICache prefetch for certian Octeon II processors.

Signed-off-by: David Daney <david.daney@...ium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@...iga.com>
---
 .../asm/mach-cavium-octeon/kernel-entry-init.h     | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h b/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h
index 1668ee5..21732c3 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h
@@ -63,6 +63,28 @@ skip:
 	li	v1, ~(7 << 7)
 	and	v0, v0, v1
 	ori	v0, v0, (6 << 7)
+
+	mfc0	v1, CP0_PRID_REG
+	and	t1, v1, 0xfff8
+	xor	t1, t1, 0x9000		# 63-P1
+	beqz	t1, 4f
+	and	t1, v1, 0xfff8
+	xor	t1, t1, 0x9008		# 63-P2
+	beqz	t1, 4f
+	and	t1, v1, 0xfff8
+	xor	t1, t1, 0x9100		# 68-P1
+	beqz	t1, 4f
+	and	t1, v1, 0xff00
+	xor	t1, t1, 0x9200		# 66-PX
+	bnez	t1, 5f			# Skip WAR for others.
+	and	t1, v1, 0x00ff
+	slti	t1, t1, 2		# 66-P1.2 and later good.
+	beqz	t1, 5f
+
+4:	# core-16057 work around
+	or	v0, v0, 0x2000		# Set IPREF bit.
+
+5:	# No core-16057 work around
 	# Write the cavium control register
 	dmtc0	v0, CP0_CVMCTL_REG
 	sync
-- 
2.1.3

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