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

   1 /*
   2  * Malta Platform-specific hooks for SMP operation
   3  */
   4 #include <linux/init.h>
   5
   6 #include <asm/mipsregs.h>
   7 #include <asm/mipsmtregs.h>
   8 #include <asm/smtc.h>
   9 #include <asm/smtc_ipi.h>
  10
  11 /* VPE/SMP Prototype implements platform interfaces directly */
  12
  13 /*
  14  * Cause the specified action to be performed on a targeted "CPU"
  15  */
  16
  17 void core_send_ipi(int cpu, unsigned int action)
  18 {
  19         /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  20         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  21 }
  22
  23 /*
  24  * Platform "CPU" startup hook
  25  */
  26
  27 void prom_boot_secondary(int cpu, struct task_struct *idle)
  28 {
  29         smtc_boot_secondary(cpu, idle);
  30 }
  31
  32 /*
  33  * Post-config but pre-boot cleanup entry point
  34  */
  35
  36 void prom_init_secondary(void)
  37 {
  38         void smtc_init_secondary(void);
  39         int myvpe;
  40
  41         /* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
  42         myvpe = read_c0_tcbind() & TCBIND_CURVPE;
  43         if (myvpe != 0) {
  44                 /* Ideally, this should be done only once per VPE, but... */
  45                 clear_c0_status(STATUSF_IP2);
  46                 set_c0_status(STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP3
  47                                 | STATUSF_IP4 | STATUSF_IP5 | STATUSF_IP6
  48                                 | STATUSF_IP7);
  49         }
  50
  51         smtc_init_secondary();
  52 }
  53
  54 /*
  55  * Platform SMP pre-initialization
  56  *
  57  * As noted above, we can assume a single CPU for now
  58  * but it may be multithreaded.
  59  */
  60
  61 void plat_smp_setup(void)
  62 {
  63         if (read_c0_config3() & (1<<2))
  64                 mipsmt_build_cpu_map(0);
  65 }
  66
  67 void __init plat_prepare_cpus(unsigned int max_cpus)
  68 {
  69         if (read_c0_config3() & (1<<2))
  70                 mipsmt_prepare_cpus();
  71 }
  72
  73 /*
  74  * SMP initialization finalization entry point
  75  */
  76
  77 void prom_smp_finish(void)
  78 {
  79         smtc_smp_finish();
  80 }
  81
  82 /*
  83  * Hook for after all CPUs are online
  84  */
  85
  86 void prom_cpus_done(void)
  87 {
  88 }