platsmp.c
3.07 KB
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/*
* Copyright 2010-2011 Calxeda, Inc.
* Copyright 2012 Pavel Machek <pavel@denx.de>
* Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
* Copyright (C) 2012 Altera Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/hardware/gic.h>
#include <asm/smp_scu.h>
#include <asm/smp_plat.h>
#include "core.h"
extern void __iomem *sys_manager_base_addr;
extern void __iomem *rst_manager_base_addr;
static void __cpuinit socfpga_secondary_init(unsigned int cpu)
{
/*
* if any interrupts are already enabled for the primary
* core (e.g. timer irq), then they will not have been enabled
* for us: do so
*/
gic_secondary_init(0);
}
static int __cpuinit socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
__raw_writel(virt_to_phys(secondary_startup), (sys_manager_base_addr+0x10));
flush_cache_all();
smp_wmb();
outer_clean_range(0, trampoline_size);
/* This will release CPU #1 out of reset.*/
__raw_writel(0, rst_manager_base_addr + 0x10);
return 0;
}
/*
* Initialise the CPU possible map early - this describes the CPUs
* which may be present or become present in the system.
*/
static void __init socfpga_smp_init_cpus(void)
{
unsigned int i, ncores;
ncores = scu_get_core_count(socfpga_scu_base_addr);
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
/* sanity check */
if (ncores > num_possible_cpus()) {
pr_warn("socfpga: no. of cores (%d) greater than configured"
"maximum of %d - clipping\n", ncores, num_possible_cpus());
ncores = num_possible_cpus();
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
{
scu_enable(socfpga_scu_base_addr);
}
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
static void socfpga_cpu_die(unsigned int cpu)
{
cpu_do_idle();
/* We should have never returned from idle */
panic("cpu %d unexpectedly exit from shutdown\n", cpu);
}
struct smp_operations socfpga_smp_ops __initdata = {
.smp_init_cpus = socfpga_smp_init_cpus,
.smp_prepare_cpus = socfpga_smp_prepare_cpus,
.smp_secondary_init = socfpga_secondary_init,
.smp_boot_secondary = socfpga_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = socfpga_cpu_die,
#endif
};