|
|
@@ -1,204 +0,0 @@
|
|
|
-/*
|
|
|
- * 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();
|
|
|
-}
|
Russell King