mirror of https://gitee.com/openkylin/linux.git
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/*
|
|
* SMP Support for A2 platforms
|
|
*
|
|
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
|
|
*
|
|
* 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/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/smp.h>
|
|
|
|
#include <asm/dbell.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/xics.h>
|
|
|
|
#include "ics.h"
|
|
#include "wsp.h"
|
|
|
|
static void __devinit smp_a2_setup_cpu(int cpu)
|
|
{
|
|
doorbell_setup_this_cpu();
|
|
|
|
if (cpu != boot_cpuid)
|
|
xics_setup_cpu();
|
|
}
|
|
|
|
int __devinit smp_a2_kick_cpu(int nr)
|
|
{
|
|
const char *enable_method;
|
|
struct device_node *np;
|
|
int thr_idx;
|
|
|
|
if (nr < 0 || nr >= NR_CPUS)
|
|
return -ENOENT;
|
|
|
|
np = of_get_cpu_node(nr, &thr_idx);
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
enable_method = of_get_property(np, "enable-method", NULL);
|
|
pr_devel("CPU%d has enable-method: \"%s\"\n", nr, enable_method);
|
|
|
|
if (!enable_method) {
|
|
printk(KERN_ERR "CPU%d has no enable-method\n", nr);
|
|
return -ENOENT;
|
|
} else if (strcmp(enable_method, "ibm,a2-scom") == 0) {
|
|
if (a2_scom_startup_cpu(nr, thr_idx, np))
|
|
return -1;
|
|
} else {
|
|
printk(KERN_ERR "CPU%d: Don't understand enable-method \"%s\"\n",
|
|
nr, enable_method);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* The processor is currently spinning, waiting for the
|
|
* cpu_start field to become non-zero After we set cpu_start,
|
|
* the processor will continue on to secondary_start
|
|
*/
|
|
paca[nr].cpu_start = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init smp_a2_probe(void)
|
|
{
|
|
return cpus_weight(cpu_possible_map);
|
|
}
|
|
|
|
static struct smp_ops_t a2_smp_ops = {
|
|
.message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
|
|
.cause_ipi = doorbell_cause_ipi,
|
|
.probe = smp_a2_probe,
|
|
.kick_cpu = smp_a2_kick_cpu,
|
|
.setup_cpu = smp_a2_setup_cpu,
|
|
};
|
|
|
|
void __init a2_setup_smp(void)
|
|
{
|
|
smp_ops = &a2_smp_ops;
|
|
}
|