LXR linux/arch/powerpc/platforms/86xx/mpc86xx

   1/*
   2 * Author: Xianghua Xiao <x.xiao@freescale.com>
   3 *         Zhang Wei <wei.zhang@freescale.com>
   4 *
   5 * Copyright 2006 Freescale Semiconductor Inc.
   6 *
   7 * This program is free software; you can redistribute  it and/or modify it
   8 * under  the terms of  the GNU General  Public License as published by the
   9 * Free Software Foundation;  either version 2 of the  License, or (at your
  10 * option) any later version.
  11 */
  12
  13#include <linux/stddef.h>
  14#include <linux/kernel.h>
  15#include <linux/init.h>
  16#include <linux/delay.h>
  17
  18#include <asm/code-patching.h>
  19#include <asm/page.h>
  20#include <asm/pgtable.h>
  21#include <asm/pci-bridge.h>
  22#include <asm/mpic.h>
  23#include <asm/cacheflush.h>
  24
  25#include <sysdev/fsl_soc.h>
  26
  27#include "mpc86xx.h"
  28
  29extern void __secondary_start_mpc86xx(void);
  30
  31#define MCM_PORT_CONFIG_OFFSET  0x10
  32
  33/* Offset from CCSRBAR */
  34#define MPC86xx_MCM_OFFSET      (0x1000)
  35#define MPC86xx_MCM_SIZE        (0x1000)
  36
  37static void __init
  38smp_86xx_release_core(int nr)
  39{
  40        __be32 __iomem *mcm_vaddr;
  41        unsigned long pcr;
  42
  43        if (nr < 0 || nr >= NR_CPUS)
  44                return;
  45
  46        /*
  47         * Startup Core #nr.
  48         */
  49        mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
  50                            MPC86xx_MCM_SIZE);
  51        pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
  52        pcr |= 1 << (nr + 24);
  53        out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
  54
  55        iounmap(mcm_vaddr);
  56}
  57
  58
  59static int __init
  60smp_86xx_kick_cpu(int nr)
  61{
  62        unsigned int save_vector;
  63        unsigned long target, flags;
  64        int n = 0;
  65        unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
  66
  67        if (nr < 0 || nr >= NR_CPUS)
  68                return -ENOENT;
  69
  70        pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
  71
  72        local_irq_save(flags);
  73
  74        /* Save reset vector */
  75        save_vector = *vector;
  76
  77        /* Setup fake reset vector to call __secondary_start_mpc86xx. */
  78        target = (unsigned long) __secondary_start_mpc86xx;
  79        patch_branch(vector, target, BRANCH_SET_LINK);
  80
  81        /* Kick that CPU */
  82        smp_86xx_release_core(nr);
  83
  84        /* Wait a bit for the CPU to take the exception. */
  85        while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
  86                mdelay(1);
  87
  88        /* Restore the exception vector */
  89        *vector = save_vector;
  90        flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
  91
  92        local_irq_restore(flags);
  93
  94        pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
  95
  96        return 0;
  97}
  98
  99
 100static void __init
 101smp_86xx_setup_cpu(int cpu_nr)
 102{
 103        mpic_setup_this_cpu();
 104}
 105
 106
 107struct smp_ops_t smp_86xx_ops = {
 108        .message_pass = smp_mpic_message_pass,
 109        .probe = smp_mpic_probe,
 110        .kick_cpu = smp_86xx_kick_cpu,
 111        .setup_cpu = smp_86xx_setup_cpu,
 112        .take_timebase = smp_generic_take_timebase,
 113        .give_timebase = smp_generic_give_timebase,
 114};
 115
 116
 117void __init
 118mpc86xx_smp_init(void)
 119{
 120        smp_ops = &smp_86xx_ops;
 121}
 122