91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2015 Linus Walleij
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms 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.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
|
|
#include <plat/platsmp.h>
|
|
#include "hotplug.h"
|
|
|
|
#define REALVIEW_SYS_FLAGSSET_OFFSET 0x30
|
|
|
|
static const struct of_device_id realview_scu_match[] = {
|
|
{ .compatible = "arm,arm11mp-scu", },
|
|
{ .compatible = "arm,cortex-a9-scu", },
|
|
{ .compatible = "arm,cortex-a5-scu", },
|
|
{ }
|
|
};
|
|
|
|
static const struct of_device_id realview_syscon_match[] = {
|
|
{ .compatible = "arm,core-module-integrator", },
|
|
{ .compatible = "arm,realview-eb-syscon", },
|
|
{ .compatible = "arm,realview-pb11mp-syscon", },
|
|
{ .compatible = "arm,realview-pbx-syscon", },
|
|
{ },
|
|
};
|
|
|
|
static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
struct device_node *np;
|
|
void __iomem *scu_base;
|
|
struct regmap *map;
|
|
unsigned int ncores;
|
|
int i;
|
|
|
|
np = of_find_matching_node(NULL, realview_scu_match);
|
|
if (!np) {
|
|
pr_err("PLATSMP: No SCU base address\n");
|
|
return;
|
|
}
|
|
scu_base = of_iomap(np, 0);
|
|
of_node_put(np);
|
|
if (!scu_base) {
|
|
pr_err("PLATSMP: No SCU remap\n");
|
|
return;
|
|
}
|
|
|
|
scu_enable(scu_base);
|
|
ncores = scu_get_core_count(scu_base);
|
|
pr_info("SCU: %d cores detected\n", ncores);
|
|
for (i = 0; i < ncores; i++)
|
|
set_cpu_possible(i, true);
|
|
iounmap(scu_base);
|
|
|
|
/* The syscon contains the magic SMP start address registers */
|
|
np = of_find_matching_node(NULL, realview_syscon_match);
|
|
if (!np) {
|
|
pr_err("PLATSMP: No syscon match\n");
|
|
return;
|
|
}
|
|
map = syscon_node_to_regmap(np);
|
|
if (IS_ERR(map)) {
|
|
pr_err("PLATSMP: No syscon regmap\n");
|
|
return;
|
|
}
|
|
/* Put the boot address in this magic register */
|
|
regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET,
|
|
__pa_symbol(versatile_secondary_startup));
|
|
}
|
|
|
|
static const struct smp_operations realview_dt_smp_ops __initconst = {
|
|
.smp_prepare_cpus = realview_smp_prepare_cpus,
|
|
.smp_secondary_init = versatile_secondary_init,
|
|
.smp_boot_secondary = versatile_boot_secondary,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_die = realview_cpu_die,
|
|
#endif
|
|
};
|
|
CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops);
|