94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2015 Linus Walleij
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*/
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <asm/cacheflush.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_scu.h>
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#include "platsmp.h"
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#define REALVIEW_SYS_FLAGSSET_OFFSET 0x30
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static const struct of_device_id realview_scu_match[] = {
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{ .compatible = "arm,arm11mp-scu", },
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{ .compatible = "arm,cortex-a9-scu", },
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{ .compatible = "arm,cortex-a5-scu", },
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{ }
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};
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static const struct of_device_id realview_syscon_match[] = {
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{ .compatible = "arm,core-module-integrator", },
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{ .compatible = "arm,realview-eb-syscon", },
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{ .compatible = "arm,realview-pb11mp-syscon", },
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{ .compatible = "arm,realview-pbx-syscon", },
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{ },
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};
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static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
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{
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struct device_node *np;
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void __iomem *scu_base;
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struct regmap *map;
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unsigned int ncores;
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int i;
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np = of_find_matching_node(NULL, realview_scu_match);
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if (!np) {
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pr_err("PLATSMP: No SCU base address\n");
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return;
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}
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scu_base = of_iomap(np, 0);
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of_node_put(np);
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if (!scu_base) {
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pr_err("PLATSMP: No SCU remap\n");
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return;
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}
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scu_enable(scu_base);
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ncores = scu_get_core_count(scu_base);
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pr_info("SCU: %d cores detected\n", ncores);
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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iounmap(scu_base);
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/* The syscon contains the magic SMP start address registers */
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np = of_find_matching_node(NULL, realview_syscon_match);
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if (!np) {
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pr_err("PLATSMP: No syscon match\n");
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return;
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}
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map = syscon_node_to_regmap(np);
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if (IS_ERR(map)) {
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pr_err("PLATSMP: No syscon regmap\n");
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return;
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}
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/* Put the boot address in this magic register */
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regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET,
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__pa_symbol(versatile_secondary_startup));
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void realview_cpu_die(unsigned int cpu)
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{
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return versatile_immitation_cpu_die(cpu, 0x20);
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}
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#endif
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static const struct smp_operations realview_dt_smp_ops __initconst = {
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.smp_prepare_cpus = realview_smp_prepare_cpus,
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.smp_secondary_init = versatile_secondary_init,
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.smp_boot_secondary = versatile_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = realview_cpu_die,
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#endif
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};
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CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops);
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