mirror of https://gitee.com/openkylin/linux.git
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* Smp support for CHRP machines.
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*
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* Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
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* deal of code from the sparc and intel versions.
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*
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* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
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*
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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/smp.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <asm/ptrace.h>
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#include <asm/atomic.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/smp.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/mpic.h>
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#include <asm/rtas.h>
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static void __devinit smp_chrp_kick_cpu(int nr)
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{
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*(unsigned long *)KERNELBASE = nr;
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asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory");
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}
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static void __devinit smp_chrp_setup_cpu(int cpu_nr)
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{
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mpic_setup_this_cpu();
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}
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static DEFINE_SPINLOCK(timebase_lock);
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static unsigned int timebase_upper = 0, timebase_lower = 0;
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void __devinit smp_chrp_give_timebase(void)
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{
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spin_lock(&timebase_lock);
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rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
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timebase_upper = get_tbu();
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timebase_lower = get_tbl();
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spin_unlock(&timebase_lock);
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while (timebase_upper || timebase_lower)
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barrier();
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rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
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}
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void __devinit smp_chrp_take_timebase(void)
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{
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while (!(timebase_upper || timebase_lower))
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barrier();
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spin_lock(&timebase_lock);
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set_tb(timebase_upper, timebase_lower);
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timebase_upper = 0;
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timebase_lower = 0;
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spin_unlock(&timebase_lock);
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printk("CPU %i taken timebase\n", smp_processor_id());
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}
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/* CHRP with openpic */
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struct smp_ops_t chrp_smp_ops = {
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.message_pass = smp_mpic_message_pass,
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.probe = smp_mpic_probe,
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.kick_cpu = smp_chrp_kick_cpu,
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.setup_cpu = smp_chrp_setup_cpu,
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.give_timebase = smp_chrp_give_timebase,
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.take_timebase = smp_chrp_take_timebase,
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};
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