linux/arch/powerpc/platforms/85xx/smp.c
<<
>>
Prefs
   1/*
   2 * Author: Andy Fleming <afleming@freescale.com>
   3 *         Kumar Gala <galak@kernel.crashing.org>
   4 *
   5 * Copyright 2006-2008 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#include <linux/of.h>
  18
  19#include <asm/machdep.h>
  20#include <asm/pgtable.h>
  21#include <asm/page.h>
  22#include <asm/mpic.h>
  23#include <asm/cacheflush.h>
  24#include <asm/dbell.h>
  25
  26#include <sysdev/fsl_soc.h>
  27
  28extern void __early_start(void);
  29
  30#define BOOT_ENTRY_ADDR_UPPER   0
  31#define BOOT_ENTRY_ADDR_LOWER   1
  32#define BOOT_ENTRY_R3_UPPER     2
  33#define BOOT_ENTRY_R3_LOWER     3
  34#define BOOT_ENTRY_RESV         4
  35#define BOOT_ENTRY_PIR          5
  36#define BOOT_ENTRY_R6_UPPER     6
  37#define BOOT_ENTRY_R6_LOWER     7
  38#define NUM_BOOT_ENTRY          8
  39#define SIZE_BOOT_ENTRY         (NUM_BOOT_ENTRY * sizeof(u32))
  40
  41static void __init
  42smp_85xx_kick_cpu(int nr)
  43{
  44        unsigned long flags;
  45        const u64 *cpu_rel_addr;
  46        __iomem u32 *bptr_vaddr;
  47        struct device_node *np;
  48        int n = 0;
  49
  50        WARN_ON (nr < 0 || nr >= NR_CPUS);
  51
  52        pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
  53
  54        np = of_get_cpu_node(nr, NULL);
  55        cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
  56
  57        if (cpu_rel_addr == NULL) {
  58                printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
  59                return;
  60        }
  61
  62        /* Map the spin table */
  63        bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
  64
  65        local_irq_save(flags);
  66
  67        out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
  68        out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
  69
  70        /* Wait a bit for the CPU to ack. */
  71        while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
  72                mdelay(1);
  73
  74        local_irq_restore(flags);
  75
  76        iounmap(bptr_vaddr);
  77
  78        pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
  79}
  80
  81static void __init
  82smp_85xx_setup_cpu(int cpu_nr)
  83{
  84        mpic_setup_this_cpu();
  85}
  86
  87struct smp_ops_t smp_85xx_ops = {
  88        .kick_cpu = smp_85xx_kick_cpu,
  89};
  90
  91void __init mpc85xx_smp_init(void)
  92{
  93        struct device_node *np;
  94
  95        np = of_find_node_by_type(NULL, "open-pic");
  96        if (np) {
  97                smp_85xx_ops.probe = smp_mpic_probe;
  98                smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
  99                smp_85xx_ops.message_pass = smp_mpic_message_pass;
 100        }
 101
 102        if (cpu_has_feature(CPU_FTR_DBELL))
 103                smp_85xx_ops.message_pass = smp_dbell_message_pass;
 104
 105        BUG_ON(!smp_85xx_ops.message_pass);
 106
 107        smp_ops = &smp_85xx_ops;
 108}
 109