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96 lines
2.2 KiB
96 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/mach-vexpress/platsmp.c |
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* |
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* Copyright (C) 2002 ARM Ltd. |
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* All Rights Reserved |
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*/ |
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#include <linux/init.h> |
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#include <linux/errno.h> |
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#include <linux/smp.h> |
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#include <linux/io.h> |
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#include <linux/of_address.h> |
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#include <linux/vexpress.h> |
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#include <asm/mcpm.h> |
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#include <asm/smp_scu.h> |
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#include <asm/mach/map.h> |
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#include <plat/platsmp.h> |
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#include "core.h" |
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bool __init vexpress_smp_init_ops(void) |
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{ |
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#ifdef CONFIG_MCPM |
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int cpu; |
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struct device_node *cpu_node, *cci_node; |
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/* |
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* The best way to detect a multi-cluster configuration |
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* is to detect if the kernel can take over CCI ports |
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* control. Loop over possible CPUs and check if CCI |
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* port control is available. |
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* Override the default vexpress_smp_ops if so. |
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*/ |
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for_each_possible_cpu(cpu) { |
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bool available; |
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cpu_node = of_get_cpu_node(cpu, NULL); |
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if (WARN(!cpu_node, "Missing cpu device node!")) |
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return false; |
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cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0); |
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available = cci_node && of_device_is_available(cci_node); |
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of_node_put(cci_node); |
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of_node_put(cpu_node); |
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if (!available) |
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return false; |
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} |
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mcpm_smp_set_ops(); |
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return true; |
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#else |
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return false; |
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#endif |
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} |
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static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = { |
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{ .compatible = "arm,cortex-a5-scu", }, |
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{ .compatible = "arm,cortex-a9-scu", }, |
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{} |
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}; |
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static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus) |
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{ |
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struct device_node *scu = of_find_matching_node(NULL, |
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vexpress_smp_dt_scu_match); |
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if (scu) |
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scu_enable(of_iomap(scu, 0)); |
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/* |
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* Write the address of secondary startup into the |
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* system-wide flags register. The boot monitor waits |
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* until it receives a soft interrupt, and then the |
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* secondary CPU branches to this address. |
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*/ |
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vexpress_flags_set(__pa_symbol(versatile_secondary_startup)); |
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} |
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#ifdef CONFIG_HOTPLUG_CPU |
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static void vexpress_cpu_die(unsigned int cpu) |
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{ |
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versatile_immitation_cpu_die(cpu, 0x40); |
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} |
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#endif |
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const struct smp_operations vexpress_smp_dt_ops __initconst = { |
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.smp_prepare_cpus = vexpress_smp_dt_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 = vexpress_cpu_die, |
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#endif |
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};
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