0ebfff1491
This adds the new irq remapper core and removes the old one. Because there are some fundamental conflicts with the old code, like the value of NO_IRQ which I'm now setting to 0 (as per discussions with Linus), etc..., this commit also changes the relevant platform and driver code over to use the new remapper (so as not to cause difficulties later in bisecting). This patch removes the old pre-parsing of the open firmware interrupt tree along with all the bogus assumptions it made to try to renumber interrupts according to the platform. This is all to be handled by the new code now. For the pSeries XICS interrupt controller, a single remapper host is created for the whole machine regardless of how many interrupt presentation and source controllers are found, and it's set to match any device node that isn't a 8259. That works fine on pSeries and avoids having to deal with some of the complexities of split source controllers vs. presentation controllers in the pSeries device trees. The powerpc i8259 PIC driver now always requests the legacy interrupt range. It also has the feature of being able to match any device node (including NULL) if passed no device node as an input. That will help porting over platforms with broken device-trees like Pegasos who don't have a proper interrupt tree. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
85 lines
2.0 KiB
C
85 lines
2.0 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/smp_lock.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/residual.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/smp.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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