platsmp.c
2.13 KB
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/*
* Copyright (c) 2013 Linaro Ltd.
* Copyright (c) 2013 Hisilicon Limited.
* Based on arch/arm/mach-vexpress/platsmp.c, Copyright (C) 2002 ARM Ltd.
*
* 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.
*/
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include "core.h"
static void __iomem *ctrl_base;
void hi3xxx_set_cpu_jump(int cpu, void *jump_addr)
{
cpu = cpu_logical_map(cpu);
if (!cpu || !ctrl_base)
return;
writel_relaxed(virt_to_phys(jump_addr), ctrl_base + ((cpu - 1) << 2));
}
int hi3xxx_get_cpu_jump(int cpu)
{
cpu = cpu_logical_map(cpu);
if (!cpu || !ctrl_base)
return 0;
return readl_relaxed(ctrl_base + ((cpu - 1) << 2));
}
static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus)
{
struct device_node *np = NULL;
unsigned long base = 0;
u32 offset = 0;
void __iomem *scu_base = NULL;
if (scu_a9_has_base()) {
base = scu_a9_get_base();
scu_base = ioremap(base, SZ_4K);
if (!scu_base) {
pr_err("ioremap(scu_base) failed\n");
return;
}
scu_enable(scu_base);
iounmap(scu_base);
}
if (!ctrl_base) {
np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
if (!np) {
pr_err("failed to find hisilicon,sysctrl node\n");
return;
}
ctrl_base = of_iomap(np, 0);
if (!ctrl_base) {
pr_err("failed to map address\n");
return;
}
if (of_property_read_u32(np, "smp-offset", &offset) < 0) {
pr_err("failed to find smp-offset property\n");
return;
}
ctrl_base += offset;
}
}
static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
hi3xxx_set_cpu(cpu, true);
hi3xxx_set_cpu_jump(cpu, secondary_startup);
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
return 0;
}
struct smp_operations hi3xxx_smp_ops __initdata = {
.smp_prepare_cpus = hi3xxx_smp_prepare_cpus,
.smp_boot_secondary = hi3xxx_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = hi3xxx_cpu_die,
.cpu_kill = hi3xxx_cpu_kill,
#endif
};