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/*
* Symmetric Multi Processing (SMP) support for Armada XP
*
* Copyright (C) 2012 Marvell
*
* Lior Amsalem <alior@marvell.com>
* Yehuda Yitschak <yehuday@marvell.com>
* Gregory CLEMENT <gregory.clement@free-electrons.com>
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* The Armada XP SoC has 4 ARMv7 PJ4B CPUs running in full HW coherency
* This file implements the routines for preparing the SMP infrastructure
* and waking up the secondary CPUs
*/
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/mbus.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include "common.h"
#include "armada-370-xp.h"
#include "pmsu.h"
#include "coherency.h"
static struct clk *__init get_cpu_clk(int cpu)
{
struct clk *cpu_clk;
struct device_node *np = of_get_cpu_node(cpu, NULL);
if (WARN(!np, "missing cpu node\n"))
return NULL;
cpu_clk = of_clk_get(np, 0);
if (WARN_ON(IS_ERR(cpu_clk)))
return NULL;
return cpu_clk;
}
void __init set_secondary_cpus_clock(void)
{
int thiscpu, cpu;
unsigned long rate;
struct clk *cpu_clk;
thiscpu = smp_processor_id();
cpu_clk = get_cpu_clk(thiscpu);
if (!cpu_clk)
return;
clk_prepare_enable(cpu_clk);
rate = clk_get_rate(cpu_clk);
/* set all the other CPU clk to the same rate than the boot CPU */
for_each_possible_cpu(cpu) {
if (cpu == thiscpu)
continue;
cpu_clk = get_cpu_clk(cpu);
if (!cpu_clk)
return;
clk_set_rate(cpu_clk, rate);
}
}
static void armada_xp_secondary_init(unsigned int cpu)
{
armada_xp_mpic_smp_cpu_init();
}
static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
pr_info("Booting CPU %d\n", cpu);
armada_xp_boot_cpu(cpu, armada_xp_secondary_startup);
return 0;
}
static void __init armada_xp_smp_init_cpus(void)
{
struct device_node *np;
unsigned int i, ncores;
np = of_find_node_by_name(NULL, "cpus");
if (!np)
panic("No 'cpus' node found\n");
ncores = of_get_child_count(np);
if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
panic("Invalid number of CPUs in DT\n");
/* Limit possible CPUs to defconfig */
if (ncores > nr_cpu_ids) {
pr_warn("SMP: %d CPUs physically present. Only %d configured.",
ncores, nr_cpu_ids);
pr_warn("Clipping CPU count to %d\n", nr_cpu_ids);
ncores = nr_cpu_ids;
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
set_smp_cross_call(armada_mpic_send_doorbell);
}
void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
{
set_secondary_cpus_clock();
flush_cache_all();
set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
mvebu_mbus_add_window("bootrom", 0xfff00000, SZ_1M);
}
struct smp_operations armada_xp_smp_ops __initdata = {
.smp_init_cpus = armada_xp_smp_init_cpus,
.smp_prepare_cpus = armada_xp_smp_prepare_cpus,
.smp_secondary_init = armada_xp_secondary_init,
.smp_boot_secondary = armada_xp_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = armada_xp_cpu_die,
#endif
};
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