/* * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Copyright (C) 2004, 05, 06 MIPS Technologies, Inc. * Elizabeth Clarke (beth@mips.com) * Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void __init smvp_copy_vpe_config(void) { write_vpe_c0_status( (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0); /* set config to be the same as vpe0, particularly kseg0 coherency alg */ write_vpe_c0_config( read_c0_config()); /* make sure there are no software interrupts pending */ write_vpe_c0_cause(0); /* Propagate Config7 */ write_vpe_c0_config7(read_c0_config7()); write_vpe_c0_count(read_c0_count()); } static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0, unsigned int ncpu) { if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)) return ncpu; /* Deactivate all but VPE 0 */ if (tc != 0) { unsigned long tmp = read_vpe_c0_vpeconf0(); tmp &= ~VPECONF0_VPA; /* master VPE */ tmp |= VPECONF0_MVP; write_vpe_c0_vpeconf0(tmp); /* Record this as available CPU */ set_cpu_possible(tc, true); __cpu_number_map[tc] = ++ncpu; __cpu_logical_map[ncpu] = tc; } /* Disable multi-threading with TC's */ write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); if (tc != 0) smvp_copy_vpe_config(); return ncpu; } static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0) { unsigned long tmp; if (!tc) return; /* bind a TC to each VPE, May as well put all excess TC's on the last VPE */ if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1)) write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)); else { write_tc_c0_tcbind(read_tc_c0_tcbind() | tc); /* and set XTC */ write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT)); } tmp = read_tc_c0_tcstatus(); /* mark not allocated and not dynamically allocatable */ tmp &= ~(TCSTATUS_A | TCSTATUS_DA); tmp |= TCSTATUS_IXMT; /* interrupt exempt */ write_tc_c0_tcstatus(tmp); write_tc_c0_tchalt(TCHALT_H); } static void vsmp_send_ipi_single(int cpu, unsigned int action) { int i; unsigned long flags; int vpflags; local_irq_save(flags); vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */ switch (action) { case SMP_CALL_FUNCTION: i = C_SW1; break; case SMP_RESCHEDULE_YOURSELF: default: i = C_SW0; break; } /* 1:1 mapping of vpe and tc... */ settc(cpu); write_vpe_c0_cause(read_vpe_c0_cause() | i); evpe(vpflags); local_irq_restore(flags); } static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action) { unsigned int i; for_each_cpu(i, mask) vsmp_send_ipi_single(i, action); } static void __cpuinit vsmp_init_secondary(void) { extern int gic_present; /* This is Malta specific: IPI,performance and timer interrupts */ if (gic_present) change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 | STATUSF_IP6 | STATUSF_IP7); else change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP6 | STATUSF_IP7); } static void __cpuinit vsmp_smp_finish(void) { /* CDFIXME: remove this? */ write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ)); #ifdef CONFIG_MIPS_MT_FPAFF /* If we have an FPU, enroll ourselves in the FPU-full mask */ if (cpu_has_fpu) cpu_set(smp_processor_id(), mt_fpu_cpumask); #endif /* CONFIG_MIPS_MT_FPAFF */ local_irq_enable(); } static void vsmp_cpus_done(void) { } /* * Setup the PC, SP, and GP of a secondary processor and start it * running! * smp_bootstrap is the place to resume from * __KSTK_TOS(idle) is apparently the stack pointer * (unsigned long)idle->thread_info the gp * assumes a 1:1 mapping of TC => VPE */ static void __cpuinit vsmp_boot_secondary(int cpu, struct task_struct *idle) { struct thread_info *gp = task_thread_info(idle); dvpe(); set_c0_mvpcontrol(MVPCONTROL_VPC); settc(cpu); /* restart */ write_tc_c0_tcrestart((unsigned long)&smp_bootstrap); /* enable the tc this vpe/cpu will be running */ write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A); write_tc_c0_tchalt(0); /* enable the VPE */ write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); /* stack pointer */ write_tc_gpr_sp( __KSTK_TOS(idle)); /* global pointer */ write_tc_gpr_gp((unsigned long)gp); flush_icache_range((unsigned long)gp, (unsigned long)(gp + sizeof(struct thread_info))); /* finally out of configuration and into chaos */ clear_c0_mvpcontrol(MVPCONTROL_VPC); evpe(EVPE_ENABLE); } /* * Common setup before any secondaries are started * Make sure all CPU's are in a sensible state before we boot any of the * secondaries */ static void __init vsmp_smp_setup(void) { unsigned int mvpconf0, ntc, tc, ncpu = 0; unsigned int nvpe; #ifdef CONFIG_MIPS_MT_FPAFF /* If we have an FPU, enroll ourselves in the FPU-full mask */ if (cpu_has_fpu) cpu_set(0, mt_fpu_cpumask); #endif /* CONFIG_MIPS_MT_FPAFF */ if (!cpu_has_mipsmt) return; /* disable MT so we can configure */ dvpe(); dmt(); /* Put MVPE's into 'configuration state' */ set_c0_mvpcontrol(MVPCONTROL_VPC); mvpconf0 = read_c0_mvpconf0(); ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT; nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; smp_num_siblings = nvpe; /* we'll always have more TC's than VPE's, so loop setting everything to a sensible state */ for (tc = 0; tc <= ntc; tc++) { settc(tc); smvp_tc_init(tc, mvpconf0); ncpu = smvp_vpe_init(tc, mvpconf0, ncpu); } /* Release config state */ clear_c0_mvpcontrol(MVPCONTROL_VPC); /* We'll wait until starting the secondaries before starting MVPE */ printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu); } static void __init vsmp_prepare_cpus(unsigned int max_cpus) { mips_mt_set_cpuoptions(); } struct plat_smp_ops vsmp_smp_ops = { .send_ipi_single = vsmp_send_ipi_single, .send_ipi_mask = vsmp_send_ipi_mask, .init_secondary = vsmp_init_secondary, .smp_finish = vsmp_smp_finish, .cpus_done = vsmp_cpus_done, .boot_secondary = vsmp_boot_secondary, .smp_setup = vsmp_smp_setup, .prepare_cpus = vsmp_prepare_cpus, };