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d2606f81d5
As all cores must be properly described in the Device Tree, there is no point in getting their numbers from SCU on A5/A9 platforms. This significantly simplifies the code, removing the need for flat-tree scanning and early static mapping. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 <mach/motherboard.h>
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#include <plat/platsmp.h>
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#include "core.h"
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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static void __init vexpress_smp_init_cpus(void)
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{
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ct_desc->init_cpu_map();
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}
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static void __init vexpress_smp_prepare_cpus(unsigned int max_cpus)
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{
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/*
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* Initialise the present map, which describes the set of CPUs
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* actually populated at the present time.
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*/
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ct_desc->smp_enable(max_cpus);
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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(virt_to_phys(versatile_secondary_startup));
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}
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struct smp_operations __initdata vexpress_smp_ops = {
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.smp_init_cpus = vexpress_smp_init_cpus,
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.smp_prepare_cpus = vexpress_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 = vexpress_cpu_die,
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#endif
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};
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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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/*
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* The best way to detect a multi-cluster configuration at the moment
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* is to look for the presence of a CCI in the system.
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* Override the default vexpress_smp_ops if so.
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*/
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struct device_node *node;
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node = of_find_compatible_node(NULL, NULL, "arm,cci-400");
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if (node && of_device_is_available(node)) {
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mcpm_smp_set_ops();
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return true;
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}
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#endif
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return false;
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}
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#if defined(CONFIG_OF)
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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(virt_to_phys(versatile_secondary_startup));
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}
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struct smp_operations __initdata vexpress_smp_dt_ops = {
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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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#endif
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