+++ /dev/null
-/*
- * linux/arch/arm/mach-cintegrator/platsmp.c
- *
- * Copyright (C) 2002 ARM Ltd.
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/errno.h>
-#include <linux/mm.h>
-
-#include <asm/atomic.h>
-#include <asm/cacheflush.h>
-#include <asm/delay.h>
-#include <asm/mmu_context.h>
-#include <asm/ptrace.h>
-#include <asm/smp.h>
-
-extern void integrator_secondary_startup(void);
-
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-volatile int __cpuinitdata pen_release = -1;
-unsigned long __cpuinitdata phys_pen_release = 0;
-
-static DEFINE_SPINLOCK(boot_lock);
-
-void __cpuinit platform_secondary_init(unsigned int cpu)
-{
- /*
- * the primary core may have used a "cross call" soft interrupt
- * to get this processor out of WFI in the BootMonitor - make
- * sure that we are no longer being sent this soft interrupt
- */
- smp_cross_call_done(cpumask_of_cpu(cpu));
-
- /*
- * if any interrupts are already enabled for the primary
- * core (e.g. timer irq), then they will not have been enabled
- * for us: do so
- */
- secondary_scan_irqs();
-
- /*
- * let the primary processor know we're out of the
- * pen, then head off into the C entry point
- */
- pen_release = -1;
-
- /*
- * Synchronise with the boot thread.
- */
- spin_lock(&boot_lock);
- spin_unlock(&boot_lock);
-}
-
-int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
- unsigned long timeout;
-
- /*
- * set synchronisation state between this boot processor
- * and the secondary one
- */
- spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
- * the holding pen - release it, then wait for it to flag
- * that it has been released by resetting pen_release.
- *
- * Note that "pen_release" is the hardware CPU ID, whereas
- * "cpu" is Linux's internal ID.
- */
- pen_release = cpu;
- flush_cache_all();
-
- /*
- * XXX
- *
- * This is a later addition to the booting protocol: the
- * bootMonitor now puts secondary cores into WFI, so
- * poke_milo() no longer gets the cores moving; we need
- * to send a soft interrupt to wake the secondary core.
- * Use smp_cross_call() for this, since there's little
- * point duplicating the code here
- */
- smp_cross_call(cpumask_of_cpu(cpu));
-
- timeout = jiffies + (1 * HZ);
- while (time_before(jiffies, timeout)) {
- if (pen_release == -1)
- break;
-
- udelay(10);
- }
-
- /*
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
-}
-
-static void __init poke_milo(void)
-{
- extern void secondary_startup(void);
-
- /* nobody is to be released from the pen yet */
- pen_release = -1;
-
- phys_pen_release = virt_to_phys(&pen_release);
-
- /*
- * write the address of secondary startup into the system-wide
- * flags register, then clear the bottom two bits, which is what
- * BootMonitor is waiting for
- */
-#if 1
-#define CINTEGRATOR_HDR_FLAGSS_OFFSET 0x30
- __raw_writel(virt_to_phys(integrator_secondary_startup),
- (IO_ADDRESS(INTEGRATOR_HDR_BASE) +
- CINTEGRATOR_HDR_FLAGSS_OFFSET));
-#define CINTEGRATOR_HDR_FLAGSC_OFFSET 0x34
- __raw_writel(3,
- (IO_ADDRESS(INTEGRATOR_HDR_BASE) +
- CINTEGRATOR_HDR_FLAGSC_OFFSET));
-#endif
-
- mb();
-}
-
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-void __init smp_init_cpus(void)
-{
- unsigned int i, ncores = get_core_count();
-
- for (i = 0; i < ncores; i++)
- cpu_set(i, cpu_possible_map);
-}
-
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
- unsigned int ncores = get_core_count();
- unsigned int cpu = smp_processor_id();
- int i;
-
- /* sanity check */
- if (ncores == 0) {
- printk(KERN_ERR
- "Integrator/CP: strange CM count of 0? Default to 1\n");
-
- ncores = 1;
- }
-
- if (ncores > NR_CPUS) {
- printk(KERN_WARNING
- "Integrator/CP: no. of cores (%d) greater than configured "
- "maximum of %d - clipping\n",
- ncores, NR_CPUS);
- ncores = NR_CPUS;
- }
-
- /*
- * start with some more config for the Boot CPU, now that
- * the world is a bit more alive (which was not the case
- * when smp_prepare_boot_cpu() was called)
- */
- smp_store_cpu_info(cpu);
-
- /*
- * are we trying to boot more cores than exist?
- */
- if (max_cpus > ncores)
- max_cpus = ncores;
-
- /*
- * Initialise the present map, which describes the set of CPUs
- * actually populated at the present time.
- */
- for (i = 0; i < max_cpus; i++)
- cpu_set(i, cpu_present_map);
-
- /*
- * Do we need any more CPUs? If so, then let them know where
- * to start. Note that, on modern versions of MILO, the "poke"
- * doesn't actually do anything until each individual core is
- * sent a soft interrupt to get it out of WFI
- */
- if (max_cpus > 1)
- poke_milo();
-}
git.openpandora.org / pandora-kernel.git / commitdiff