aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch')
-rw-r--r--target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch33
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch b/target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch
new file mode 100644
index 0000000000..f89e078e70
--- /dev/null
+++ b/target/linux/amazon/patches-2.6.37/000-mips-bad-intctl.patch
@@ -0,0 +1,33 @@
+--- a/arch/mips/kernel/traps.c
++++ b/arch/mips/kernel/traps.c
+@@ -1578,7 +1578,16 @@ void __cpuinit per_cpu_trap_init(void)
+ if (cpu_has_mips_r2) {
+ cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP;
+ cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
++ if (!cp0_compare_irq)
++ cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
++
+ cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;
++ if (!cp0_perfcount_irq)
++ cp0_perfcount_irq = CP0_LEGACY_PERFCNT_IRQ;
++
++ if (arch_fixup_c0_irqs)
++ arch_fixup_c0_irqs();
++
+ if (cp0_perfcount_irq == cp0_compare_irq)
+ cp0_perfcount_irq = -1;
+ } else {
+--- a/arch/mips/include/asm/irq.h
++++ b/arch/mips/include/asm/irq.h
+@@ -138,9 +138,11 @@ extern void free_irqno(unsigned int irq)
+ * IE7. Since R2 their number has to be read from the c0_intctl register.
+ */
+ #define CP0_LEGACY_COMPARE_IRQ 7
++#define CP0_LEGACY_PERFCNT_IRQ 7
+
+ extern int cp0_compare_irq;
+ extern int cp0_compare_irq_shift;
+ extern int cp0_perfcount_irq;
++extern void __weak arch_fixup_c0_irqs(void);
+
+ #endif /* _ASM_IRQ_H */