arch/powerpc/platforms/86xx/mpc86xx_smp.c

   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/pgtable.h>
  19 #include <asm/page.h>
  20 #include <asm/pci-bridge.h>
  21 #include <asm-powerpc/mpic.h>
  22 #include <asm/mpc86xx.h>
  23 #include <asm/cacheflush.h>
  24
  25 #include <sysdev/fsl_soc.h>
  26
  27 #include "mpc86xx.h"
  28
  29 extern void __secondary_start_mpc86xx(void);
  30 extern unsigned long __secondary_hold_acknowledge;
  31
  32
  33 static void __init
  34 smp_86xx_release_core(int nr)
  35 {
  36         void *mcm_vaddr;
  37         unsigned long vaddr, pcr;
  38
  39         if (nr < 0 || nr >= NR_CPUS)
  40                 return;
  41
  42         /*
  43          * Startup Core #nr.
  44          */
  45         mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
  46                             MPC86xx_MCM_SIZE);
  47         vaddr = (unsigned long)mcm_vaddr +  MCM_PORT_CONFIG_OFFSET;
  48         pcr = in_be32((volatile unsigned *)vaddr);
  49         pcr |= 1 << (nr + 24);
  50         out_be32((volatile unsigned *)vaddr, pcr);
  51 }
  52
  53
  54 static void __init
  55 smp_86xx_kick_cpu(int nr)
  56 {
  57         unsigned int save_vector;
  58         unsigned long target, flags;
  59         int n = 0;
  60         volatile unsigned int *vector
  61                  = (volatile unsigned int *)(KERNELBASE + 0x100);
  62
  63         if (nr < 0 || nr >= NR_CPUS)
  64                 return;
  65
  66         pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
  67
  68         local_irq_save(flags);
  69         local_irq_disable();
  70
  71         /* Save reset vector */
  72         save_vector = *vector;
  73
  74         /* Setup fake reset vector to call __secondary_start_mpc86xx. */
  75         target = (unsigned long) __secondary_start_mpc86xx;
  76         create_branch((unsigned long)vector, target, BRANCH_SET_LINK);
  77
  78         /* Kick that CPU */
  79         smp_86xx_release_core(nr);
  80
  81         /* Wait a bit for the CPU to take the exception. */
  82         while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
  83                 mdelay(1);
  84
  85         /* Restore the exception vector */
  86         *vector = save_vector;
  87         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
  88
  89         local_irq_restore(flags);
  90
  91         pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
  92 }
  93
  94
  95 static void __init
  96 smp_86xx_setup_cpu(int cpu_nr)
  97 {
  98         mpic_setup_this_cpu();
  99 }
 100
 101
 102 struct smp_ops_t smp_86xx_ops = {
 103         .message_pass = smp_mpic_message_pass,
 104         .probe = smp_mpic_probe,
 105         .kick_cpu = smp_86xx_kick_cpu,
 106         .setup_cpu = smp_86xx_setup_cpu,
 107         .take_timebase = smp_generic_take_timebase,
 108         .give_timebase = smp_generic_give_timebase,
 109 };
 110
 111
 112 void __init
 113 mpc86xx_smp_init(void)
 114 {
 115         smp_ops = &smp_86xx_ops;
 116 }