arch/mips/mips-boards/malta/malta_smtc.c

   1 /*
   2  * Malta Platform-specific hooks for SMP operation
   3  */
   4 #include <linux/irq.h>
   5 #include <linux/init.h>
   6
   7 #include <asm/mipsregs.h>
   8 #include <asm/mipsmtregs.h>
   9 #include <asm/smtc.h>
  10 #include <asm/smtc_ipi.h>
  11
  12 /* VPE/SMP Prototype implements platform interfaces directly */
  13
  14 /*
  15  * Cause the specified action to be performed on a targeted "CPU"
  16  */
  17
  18 void core_send_ipi(int cpu, unsigned int action)
  19 {
  20         /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  21         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  22 }
  23
  24 /*
  25  * Platform "CPU" startup hook
  26  */
  27
  28 void __cpuinit prom_boot_secondary(int cpu, struct task_struct *idle)
  29 {
  30         smtc_boot_secondary(cpu, idle);
  31 }
  32
  33 /*
  34  * Post-config but pre-boot cleanup entry point
  35  */
  36
  37 void __cpuinit prom_init_secondary(void)
  38 {
  39         void smtc_init_secondary(void);
  40         int myvpe;
  41
  42         /* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
  43         myvpe = read_c0_tcbind() & TCBIND_CURVPE;
  44         if (myvpe != 0) {
  45                 /* Ideally, this should be done only once per VPE, but... */
  46                 clear_c0_status(ST0_IM);
  47                 set_c0_status((0x100 << cp0_compare_irq)
  48                                 | (0x100 << MIPS_CPU_IPI_IRQ));
  49                 if (cp0_perfcount_irq >= 0)
  50                         set_c0_status(0x100 << cp0_perfcount_irq);
  51         }
  52
  53         smtc_init_secondary();
  54 }
  55
  56 /*
  57  * Platform SMP pre-initialization
  58  *
  59  * As noted above, we can assume a single CPU for now
  60  * but it may be multithreaded.
  61  */
  62
  63 void __cpuinit plat_smp_setup(void)
  64 {
  65         if (read_c0_config3() & (1<<2))
  66                 mipsmt_build_cpu_map(0);
  67 }
  68
  69 void __init plat_prepare_cpus(unsigned int max_cpus)
  70 {
  71         if (read_c0_config3() & (1<<2))
  72                 mipsmt_prepare_cpus();
  73 }
  74
  75 /*
  76  * SMP initialization finalization entry point
  77  */
  78
  79 void __cpuinit prom_smp_finish(void)
  80 {
  81         smtc_smp_finish();
  82 }
  83
  84 /*
  85  * Hook for after all CPUs are online
  86  */
  87
  88 void prom_cpus_done(void)
  89 {
  90 }