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kernel add
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/*
* Author: Xianghua Xiao <x.xiao@freescale.com>
* Zhang Wei <wei.zhang@freescale.com>
*
* Copyright 2006 Freescale Semiconductor Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pci-bridge.h>
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <sysdev/fsl_soc.h>
#include "mpc86xx.h"
extern void __secondary_start_mpc86xx(void);
#define MCM_PORT_CONFIG_OFFSET 0x10
/* Offset from CCSRBAR */
#define MPC86xx_MCM_OFFSET (0x1000)
#define MPC86xx_MCM_SIZE (0x1000)
static void __init
smp_86xx_release_core(int nr)
{
__be32 __iomem *mcm_vaddr;
unsigned long pcr;
if (nr < 0 || nr >= NR_CPUS)
return;
/*
* Startup Core #nr.
*/
mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
MPC86xx_MCM_SIZE);
pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
pcr |= 1 << (nr + 24);
out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
iounmap(mcm_vaddr);
}
static int __init
smp_86xx_kick_cpu(int nr)
{
unsigned int save_vector;
unsigned long target, flags;
int n = 0;
unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
if (nr < 0 || nr >= NR_CPUS)
return -ENOENT;
pr_debug("smp_86xx_kick_cpu: kick CPU #%d
", nr);
local_irq_save(flags);
/* Save reset vector */
save_vector = *vector;
/* Setup fake reset vector to call __secondary_start_mpc86xx. */
target = (unsigned long) __secondary_start_mpc86xx;
patch_branch(vector, target, BRANCH_SET_LINK);
/* Kick that CPU */
smp_86xx_release_core(nr);
/* Wait a bit for the CPU to take the exception. */
while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
mdelay(1);
/* Restore the exception vector */
*vector = save_vector;
flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
local_irq_restore(flags);
pr_debug("wait CPU #%d for %d msecs.
", nr, n);
return 0;
}
static void __init
smp_86xx_setup_cpu(int cpu_nr)
{
mpic_setup_this_cpu();
}
struct smp_ops_t smp_86xx_ops = {
.message_pass = smp_mpic_message_pass,
.probe = smp_mpic_probe,
.kick_cpu = smp_86xx_kick_cpu,
.setup_cpu = smp_86xx_setup_cpu,
.take_timebase = smp_generic_take_timebase,
.give_timebase = smp_generic_give_timebase,
};
void __init
mpc86xx_smp_init(void)
{
smp_ops = &smp_86xx_ops;
}
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