[PATCH] ARM SMP: Add missed files from Integrator/CP platform
Add missed new files from basic SMP support for the Integrator/CP platform. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Russell King
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20cf33ea16
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fe6ef2daa2
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/*
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* linux/arch/arm/mach-integrator/headsmp.S
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*
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* Copyright (c) 2003 ARM Limited
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it 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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#include <linux/linkage.h>
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#include <linux/init.h>
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__INIT
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/*
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* Integrator specific entry point for secondary CPUs. This provides
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* a "holding pen" into which all secondary cores are held until we're
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* ready for them to initialise.
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*/
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ENTRY(integrator_secondary_startup)
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adr r4, 1f
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ldmia r4, {r5, r6}
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sub r4, r4, r5
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ldr r6, [r6, r4]
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pen: ldr r7, [r6]
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cmp r7, r0
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bne pen
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/*
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* we've been released from the holding pen: secondary_stack
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* should now contain the SVC stack for this core
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*/
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b secondary_startup
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1: .long .
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.long phys_pen_release
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/*
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* linux/arch/arm/mach-cintegrator/platsmp.c
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*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it 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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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <asm/atomic.h>
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#include <asm/delay.h>
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#include <asm/mmu_context.h>
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#include <asm/procinfo.h>
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#include <asm/ptrace.h>
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#include <asm/smp.h>
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extern void integrator_secondary_startup(void);
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/*
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* control for which core is the next to come out of the secondary
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* boot "holding pen"
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*/
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volatile int __initdata pen_release = -1;
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unsigned long __initdata phys_pen_release = 0;
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static DEFINE_SPINLOCK(boot_lock);
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void __init platform_secondary_init(unsigned int cpu)
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{
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/*
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* the primary core may have used a "cross call" soft interrupt
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* to get this processor out of WFI in the BootMonitor - make
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* sure that we are no longer being sent this soft interrupt
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*/
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smp_cross_call_done(cpumask_of_cpu(cpu));
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/*
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* if any interrupts are already enabled for the primary
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* core (e.g. timer irq), then they will not have been enabled
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* for us: do so
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*/
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secondary_scan_irqs();
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/*
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* let the primary processor know we're out of the
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* pen, then head off into the C entry point
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*/
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pen_release = -1;
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/*
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* Synchronise with the boot thread.
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*/
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spin_lock(&boot_lock);
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spin_unlock(&boot_lock);
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}
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int __init boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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unsigned long timeout;
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/*
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* set synchronisation state between this boot processor
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* and the secondary one
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*/
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spin_lock(&boot_lock);
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/*
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* The secondary processor is waiting to be released from
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* the holding pen - release it, then wait for it to flag
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* that it has been released by resetting pen_release.
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*
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* Note that "pen_release" is the hardware CPU ID, whereas
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* "cpu" is Linux's internal ID.
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*/
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pen_release = cpu;
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/*
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* XXX
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*
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* This is a later addition to the booting protocol: the
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* bootMonitor now puts secondary cores into WFI, so
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* poke_milo() no longer gets the cores moving; we need
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* to send a soft interrupt to wake the secondary core.
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* Use smp_cross_call() for this, since there's little
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* point duplicating the code here
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*/
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smp_cross_call(cpumask_of_cpu(cpu));
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timeout = jiffies + (1 * HZ);
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while (time_before(jiffies, timeout)) {
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if (pen_release == -1)
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break;
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udelay(10);
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}
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/*
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* now the secondary core is starting up let it run its
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* calibrations, then wait for it to finish
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*/
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spin_unlock(&boot_lock);
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return pen_release != -1 ? -ENOSYS : 0;
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}
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static void __init poke_milo(void)
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{
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extern void secondary_startup(void);
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/* nobody is to be released from the pen yet */
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pen_release = -1;
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phys_pen_release = virt_to_phys(&pen_release);
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/*
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* write the address of secondary startup into the system-wide
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* flags register, then clear the bottom two bits, which is what
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* BootMonitor is waiting for
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*/
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#if 1
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#define CINTEGRATOR_HDR_FLAGSS_OFFSET 0x30
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__raw_writel(virt_to_phys(integrator_secondary_startup),
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(IO_ADDRESS(INTEGRATOR_HDR_BASE) +
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CINTEGRATOR_HDR_FLAGSS_OFFSET));
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#define CINTEGRATOR_HDR_FLAGSC_OFFSET 0x34
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__raw_writel(3,
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(IO_ADDRESS(INTEGRATOR_HDR_BASE) +
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CINTEGRATOR_HDR_FLAGSC_OFFSET));
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#endif
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mb();
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}
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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unsigned int ncores = get_core_count();
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unsigned int cpu = smp_processor_id();
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int i;
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/* sanity check */
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if (ncores == 0) {
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printk(KERN_ERR
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"Integrator/CP: strange CM count of 0? Default to 1\n");
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ncores = 1;
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}
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if (ncores > NR_CPUS) {
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printk(KERN_WARNING
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"Integrator/CP: no. of cores (%d) greater than configured "
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"maximum of %d - clipping\n",
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ncores, NR_CPUS);
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ncores = NR_CPUS;
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}
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/*
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* start with some more config for the Boot CPU, now that
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* the world is a bit more alive (which was not the case
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* when smp_prepare_boot_cpu() was called)
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*/
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smp_store_cpu_info(cpu);
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/*
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* are we trying to boot more cores than exist?
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*/
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if (max_cpus > ncores)
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max_cpus = ncores;
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/*
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* Initialise the present mask - this tells us which CPUs should
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* be present.
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*/
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for (i = 0; i < max_cpus; i++) {
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cpu_set(i, cpu_present_mask);
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}
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/*
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* Do we need any more CPUs? If so, then let them know where
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* to start. Note that, on modern versions of MILO, the "poke"
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* doesn't actually do anything until each individual core is
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* sent a soft interrupt to get it out of WFI
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*/
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if (max_cpus > 1)
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poke_milo();
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}
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@ -0,0 +1,19 @@
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#ifndef ASMARM_ARCH_SMP_H
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#define ASMARM_ARCH_SMP_H
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#include <linux/config.h>
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#include <asm/arch/hardware.h>
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#include <asm/io.h>
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#define hard_smp_processor_id() \
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({ \
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unsigned int cpunum; \
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__asm__("mrc p15, 0, %0, c0, c0, 5" \
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: "=r" (cpunum)); \
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cpunum &= 0x0F; \
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})
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extern void secondary_scan_irqs(void);
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#endif
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