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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 Linus Walleij
*/
#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 "platsmp.h"
#define REALVIEW_SYS_FLAGSSET_OFFSET 0x30
static const struct of_device_id realview_scu_match[] = {
/*
* The ARM11MP SCU compatible is only provided as fallback for
* old RealView EB Cortex-A9 device trees that were using this
* compatible by mistake.
*/
{ .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-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);
of_node_put(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));
}
#ifdef CONFIG_HOTPLUG_CPU
static void realview_cpu_die(unsigned int cpu)
{
return versatile_immitation_cpu_die(cpu, 0x20);
}
#endif
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);
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