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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Author: Xianghua Xiao <x.xiao@freescale.com>
   4 *         Zhang Wei <wei.zhang@freescale.com>
   5 *
   6 * Copyright 2006 Freescale Semiconductor Inc.
   7 */
   8
   9#include <linux/stddef.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/delay.h>
  13#include <linux/pgtable.h>
  14
  15#include <asm/code-patching.h>
  16#include <asm/page.h>
  17#include <asm/pci-bridge.h>
  18#include <asm/mpic.h>
  19#include <asm/cacheflush.h>
  20#include <asm/inst.h>
  21
  22#include <sysdev/fsl_soc.h>
  23
  24#include "mpc86xx.h"
  25
  26extern void __secondary_start_mpc86xx(void);
  27
  28#define MCM_PORT_CONFIG_OFFSET  0x10
  29
  30/* Offset from CCSRBAR */
  31#define MPC86xx_MCM_OFFSET      (0x1000)
  32#define MPC86xx_MCM_SIZE        (0x1000)
  33
  34static void __init
  35smp_86xx_release_core(int nr)
  36{
  37        __be32 __iomem *mcm_vaddr;
  38        unsigned long pcr;
  39
  40        if (nr < 0 || nr >= NR_CPUS)
  41                return;
  42
  43        /*
  44         * Startup Core #nr.
  45         */
  46        mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
  47                            MPC86xx_MCM_SIZE);
  48        pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
  49        pcr |= 1 << (nr + 24);
  50        out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
  51
  52        iounmap(mcm_vaddr);
  53}
  54
  55
  56static int __init
  57smp_86xx_kick_cpu(int nr)
  58{
  59        unsigned int save_vector;
  60        unsigned long target, flags;
  61        int n = 0;
  62        unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
  63
  64        if (nr < 0 || nr >= NR_CPUS)
  65                return -ENOENT;
  66
  67        pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
  68
  69        local_irq_save(flags);
  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        patch_branch(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        patch_instruction(vector, ppc_inst(save_vector));
  87
  88        local_irq_restore(flags);
  89
  90        pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
  91
  92        return 0;
  93}
  94
  95
  96static void __init
  97smp_86xx_setup_cpu(int cpu_nr)
  98{
  99        mpic_setup_this_cpu();
 100}
 101
 102
 103struct smp_ops_t smp_86xx_ops = {
 104        .cause_nmi_ipi = NULL,
 105        .message_pass = smp_mpic_message_pass,
 106        .probe = smp_mpic_probe,
 107        .kick_cpu = smp_86xx_kick_cpu,
 108        .setup_cpu = smp_86xx_setup_cpu,
 109        .take_timebase = smp_generic_take_timebase,
 110        .give_timebase = smp_generic_give_timebase,
 111};
 112
 113
 114void __init
 115mpc86xx_smp_init(void)
 116{
 117        smp_ops = &smp_86xx_ops;
 118}
 119