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

[Florian Fainelli]

Disable pref 30 by utilizing the standard quirk method and matching the
affected SoCs: 7344, 7346, 7425.

Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
 arch/mips/bmips/setup.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c
index 19308df5f577..df0efea12611 100644
--- a/arch/mips/bmips/setup.c
+++ b/arch/mips/bmips/setup.c
@@ -110,6 +110,20 @@ static void bcm6368_quirks(void)
        bcm63xx_fixup_cpu1();
 }
 
+static void bmips5000_pref30_quirk(void)
+{
+       __asm__ __volatile__(
+       "       li      $8, 0x5a455048\n"
+       "       .word   0x4088b00f\n"   /* mtc0 $8, $22, 15 */
+       "       nop; nop; nop\n"
+       "       .word   0x4008b008\n"   /* mfc0 $8, $22, 8 */
+       /* 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,bcm3368",               &bcm6358_quirks                 },
        { "brcm,bcm3384-viper",         &bcm3384_viper_quirks           },
@@ -120,6 +134,9 @@ static const struct bmips_quirk bmips_quirk_list[] = {
        { "brcm,bcm6368",               &bcm6368_quirks                 },
        { "brcm,bcm63168",              &bcm6368_quirks                 },
        { "brcm,bcm63268",              &bcm6368_quirks                 },
+       { "brcm,bcm7344",               &bmips5000_pref30_quirk         },
+       { "brcm,bcm7346",               &bmips5000_pref30_quirk         },
+       { "brcm,bcm7425",               &bmips5000_pref30_quirk         },
        { },
 };
 
-- 
2.25.1