blob: a6da03f5b24ec921090af5508a2b6d87a66c7197 [file] [log] [blame]
* Symmetric Multi Processing (SMP) support for Armada XP
* Copyright (C) 2012 Marvell
* Lior Amsalem <>
* Yehuda Yitschak <>
* Gregory CLEMENT <>
* Thomas Petazzoni <>
* 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/of_address.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"
#define AXP_BOOTROM_BASE 0xfff00000
#define AXP_BOOTROM_SIZE 0x100000
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;
static 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)
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)
cpu_clk = get_cpu_clk(cpu);
if (!cpu_clk)
clk_set_rate(cpu_clk, rate);
static void armada_xp_secondary_init(unsigned int cpu)
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)
unsigned int ncores = num_possible_cpus();
if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
panic("Invalid number of CPUs in DT\n");
static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
struct device_node *node;
struct resource res;
int err;
set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
* In order to boot the secondary CPUs we need to ensure
* the bootROM is mapped at the correct address.
node = of_find_compatible_node(NULL, NULL, "marvell,bootrom");
if (!node)
panic("Cannot find 'marvell,bootrom' compatible node");
err = of_address_to_resource(node, 0, &res);
if (err < 0)
panic("Cannot get 'bootrom' node address");
if (res.start != AXP_BOOTROM_BASE ||
resource_size(&res) != AXP_BOOTROM_SIZE)
panic("The address for the BootROM is incorrect");
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,
.cpu_die = armada_xp_cpu_die,