252 lines
6.6 KiB
C
252 lines
6.6 KiB
C
/*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
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* Elizabeth Clarke (beth@mips.com)
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* Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/interrupt.h>
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#include <linux/compiler.h>
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#include <linux/sched/task_stack.h>
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#include <linux/smp.h>
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#include <linux/atomic.h>
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#include <asm/cacheflush.h>
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#include <asm/cpu.h>
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#include <asm/processor.h>
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#include <asm/hardirq.h>
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#include <asm/mmu_context.h>
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#include <asm/time.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips_mt.h>
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#include <asm/mips-cps.h>
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static void __init smvp_copy_vpe_config(void)
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{
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write_vpe_c0_status(
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(read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
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/* set config to be the same as vpe0, particularly kseg0 coherency alg */
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write_vpe_c0_config( read_c0_config());
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/* make sure there are no software interrupts pending */
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write_vpe_c0_cause(0);
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/* Propagate Config7 */
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write_vpe_c0_config7(read_c0_config7());
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write_vpe_c0_count(read_c0_count());
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}
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static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
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unsigned int ncpu)
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{
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if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
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return ncpu;
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/* Deactivate all but VPE 0 */
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if (tc != 0) {
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unsigned long tmp = read_vpe_c0_vpeconf0();
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tmp &= ~VPECONF0_VPA;
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/* master VPE */
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tmp |= VPECONF0_MVP;
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write_vpe_c0_vpeconf0(tmp);
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/* Record this as available CPU */
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set_cpu_possible(tc, true);
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set_cpu_present(tc, true);
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__cpu_number_map[tc] = ++ncpu;
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__cpu_logical_map[ncpu] = tc;
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}
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/* Disable multi-threading with TC's */
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write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
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if (tc != 0)
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smvp_copy_vpe_config();
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cpu_set_vpe_id(&cpu_data[ncpu], tc);
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return ncpu;
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}
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static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0)
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{
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unsigned long tmp;
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if (!tc)
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return;
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/* bind a TC to each VPE, May as well put all excess TC's
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on the last VPE */
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if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
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write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
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else {
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write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
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/* and set XTC */
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
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}
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tmp = read_tc_c0_tcstatus();
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/* mark not allocated and not dynamically allocatable */
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tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
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tmp |= TCSTATUS_IXMT; /* interrupt exempt */
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write_tc_c0_tcstatus(tmp);
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write_tc_c0_tchalt(TCHALT_H);
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}
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static void vsmp_init_secondary(void)
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{
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/* This is Malta specific: IPI,performance and timer interrupts */
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if (mips_gic_present())
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change_c0_status(ST0_IM, STATUSF_IP2 | STATUSF_IP3 |
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STATUSF_IP4 | STATUSF_IP5 |
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STATUSF_IP6 | STATUSF_IP7);
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else
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change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
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STATUSF_IP6 | STATUSF_IP7);
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}
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static void vsmp_smp_finish(void)
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{
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/* CDFIXME: remove this? */
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write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
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#ifdef CONFIG_MIPS_MT_FPAFF
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/* If we have an FPU, enroll ourselves in the FPU-full mask */
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if (cpu_has_fpu)
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cpumask_set_cpu(smp_processor_id(), &mt_fpu_cpumask);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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local_irq_enable();
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}
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/*
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* Setup the PC, SP, and GP of a secondary processor and start it
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* running!
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* smp_bootstrap is the place to resume from
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* __KSTK_TOS(idle) is apparently the stack pointer
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* (unsigned long)idle->thread_info the gp
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* assumes a 1:1 mapping of TC => VPE
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*/
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static int vsmp_boot_secondary(int cpu, struct task_struct *idle)
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{
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struct thread_info *gp = task_thread_info(idle);
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dvpe();
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set_c0_mvpcontrol(MVPCONTROL_VPC);
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settc(cpu);
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/* restart */
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write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
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/* enable the tc this vpe/cpu will be running */
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write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
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write_tc_c0_tchalt(0);
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/* enable the VPE */
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
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/* stack pointer */
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write_tc_gpr_sp( __KSTK_TOS(idle));
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/* global pointer */
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write_tc_gpr_gp((unsigned long)gp);
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flush_icache_range((unsigned long)gp,
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(unsigned long)(gp + sizeof(struct thread_info)));
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/* finally out of configuration and into chaos */
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clear_c0_mvpcontrol(MVPCONTROL_VPC);
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evpe(EVPE_ENABLE);
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return 0;
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}
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/*
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* Common setup before any secondaries are started
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* Make sure all CPU's are in a sensible state before we boot any of the
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* secondaries
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*/
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static void __init vsmp_smp_setup(void)
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{
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unsigned int mvpconf0, ntc, tc, ncpu = 0;
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unsigned int nvpe;
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#ifdef CONFIG_MIPS_MT_FPAFF
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/* If we have an FPU, enroll ourselves in the FPU-full mask */
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if (cpu_has_fpu)
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cpumask_set_cpu(0, &mt_fpu_cpumask);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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if (!cpu_has_mipsmt)
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return;
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/* disable MT so we can configure */
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dvpe();
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dmt();
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/* Put MVPE's into 'configuration state' */
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set_c0_mvpcontrol(MVPCONTROL_VPC);
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mvpconf0 = read_c0_mvpconf0();
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ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
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nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
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smp_num_siblings = nvpe;
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/* we'll always have more TC's than VPE's, so loop setting everything
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to a sensible state */
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for (tc = 0; tc <= ntc; tc++) {
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settc(tc);
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smvp_tc_init(tc, mvpconf0);
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ncpu = smvp_vpe_init(tc, mvpconf0, ncpu);
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}
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/* Release config state */
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clear_c0_mvpcontrol(MVPCONTROL_VPC);
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/* We'll wait until starting the secondaries before starting MVPE */
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printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
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}
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static void __init vsmp_prepare_cpus(unsigned int max_cpus)
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{
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mips_mt_set_cpuoptions();
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}
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const struct plat_smp_ops vsmp_smp_ops = {
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.send_ipi_single = mips_smp_send_ipi_single,
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.send_ipi_mask = mips_smp_send_ipi_mask,
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.init_secondary = vsmp_init_secondary,
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.smp_finish = vsmp_smp_finish,
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.boot_secondary = vsmp_boot_secondary,
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.smp_setup = vsmp_smp_setup,
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.prepare_cpus = vsmp_prepare_cpus,
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};
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