![Thomas Petazzoni](/assets/img/avatar_default.png)
The pmsu.c driver contained an armada_xp_boot_cpu() function that sets the boot address of a secondary CPUs and deasserts the reset. However, the Armada 375 needs a slightly different logic, so it makes more sense to move this code into the Armada XP specific platsmp.c. In order to achieve this, the mvebu_pmsu_set_cpu_boot_addr() function is exported. It will be needed for both the Armada XP and Armada 38x SMP implementations. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397483648-26611-2-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
|
|
* 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/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)
|
|
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)
|
|
{
|
|
int ret, hw_cpu;
|
|
|
|
pr_info("Booting CPU %d\n", cpu);
|
|
|
|
hw_cpu = cpu_logical_map(cpu);
|
|
mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_xp_secondary_startup);
|
|
ret = mvebu_cpu_reset_deassert(hw_cpu);
|
|
if (ret) {
|
|
pr_warn("unable to boot CPU: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
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");
|
|
|
|
set_smp_cross_call(armada_mpic_send_doorbell);
|
|
}
|
|
|
|
static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
struct device_node *node;
|
|
struct resource res;
|
|
int err;
|
|
|
|
set_secondary_cpus_clock();
|
|
flush_cache_all();
|
|
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,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_die = armada_xp_cpu_die,
|
|
#endif
|
|
};
|