[PATCH 1/6] MIPS: BMIPS: Disable pref 30 for buggy CPUs

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Disable pref 30 by utilizing the standard quirk method and matching the
affected SoCs: 7344, 7436, 7425.

Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
---
 arch/mips/bmips/setup.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c
index 35535284b39e..9c8f15daf5e9 100644
--- a/arch/mips/bmips/setup.c
+++ b/arch/mips/bmips/setup.c
@@ -100,12 +100,28 @@ static void bcm6368_quirks(void)
 	bcm63xx_fixup_cpu1();
 }
 
+static void bmips5000_pref30_quirk(void)
+{
+	__asm__ __volatile__(
+	"	.word	0x4008b008\n"	/* mfc0 $8, $22, 8 */
+	"	lui	$9, 0x0100\n"
+	"	or	$8, $9\n"
+	/* disable "pref 30" on buggy CPUs */
+	"	lui	$9, 0x0800\n"
+	"	or	$8, $9\n"
+	"	.word	0x4088b008\n"	/* mtc0 $8, $22, 8 */
+	: : : "$8", "$9");
+}
+
 static const struct bmips_quirk bmips_quirk_list[] = {
 	{ "brcm,bcm3384-viper",		&bcm3384_viper_quirks		},
 	{ "brcm,bcm33843-viper",	&bcm3384_viper_quirks		},
 	{ "brcm,bcm6328",		&bcm6328_quirks			},
 	{ "brcm,bcm6368",		&bcm6368_quirks			},
 	{ "brcm,bcm63168",		&bcm6368_quirks			},
+	{ "brcm,bcm7344",		&bmips5000_pref30_quirk		},
+	{ "brcm,bcm7346",		&bmips5000_pref30_quirk		},
+	{ "brcm,bcm7425",		&bmips5000_pref30_quirk		},
 	{ },
 };
 
-- 
2.1.0





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