target/linux/ifxmips/patches/000-mips-bad-intctl.patch

   1 --- a/arch/mips/kernel/traps.c
   2 +++ b/arch/mips/kernel/traps.c
   3 @@ -1496,7 +1496,18 @@ void __cpuinit per_cpu_trap_init(void)
   4         if (cpu_has_mips_r2) {
   5                 cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP;
   6                 cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
   7 +
   8 +               if (!cp0_compare_irq)
   9 +                       cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
  10 +
  11                 cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;
  12 +
  13 +               if (!cp0_perfcount_irq)
  14 +                       cp0_perfcount_irq = CP0_LEGACY_PERFCNT_IRQ;
  15 +
  16 +               if (arch_fixup_c0_irqs)
  17 +                       arch_fixup_c0_irqs();
  18 +
  19                 if (cp0_perfcount_irq == cp0_compare_irq)
  20                         cp0_perfcount_irq = -1;
  21         } else {
  22 --- a/arch/mips/include/asm/irq.h
  23 +++ b/arch/mips/include/asm/irq.h
  24 @@ -133,9 +133,11 @@ extern void free_irqno(unsigned int irq)
  25   * IE7.  Since R2 their number has to be read from the c0_intctl register.
  26   */
  27  #define CP0_LEGACY_COMPARE_IRQ 7
  28 +#define CP0_LEGACY_PERFCNT_IRQ 7
  29
  30  extern int cp0_compare_irq;
  31  extern int cp0_compare_irq_shift;
  32  extern int cp0_perfcount_irq;
  33 +extern void __weak arch_fixup_c0_irqs(void);
  34
  35  #endif /* _ASM_IRQ_H */