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Russell King59ac59f2010-02-11 21:56:07 +00001/*
2 * linux/arch/arm/mach-vexpress/platsmp.c
3 *
4 * Copyright (C) 2002 ARM Ltd.
5 * All Rights Reserved
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/init.h>
12#include <linux/errno.h>
Russell King59ac59f2010-02-11 21:56:07 +000013#include <linux/smp.h>
14#include <linux/io.h>
Pawel Molld2606f82013-09-17 18:30:58 +010015#include <linux/of_address.h>
Pawel Moll38669e02012-10-09 12:56:36 +010016#include <linux/vexpress.h>
Pawel Moll95d59742012-02-24 09:18:14 +000017
Jon Medhurst033a8992013-01-30 09:12:55 +000018#include <asm/mcpm.h>
Pawel Moll95d59742012-02-24 09:18:14 +000019#include <asm/smp_scu.h>
Pawel Moll95d59742012-02-24 09:18:14 +000020#include <asm/mach/map.h>
Russell King59ac59f2010-02-11 21:56:07 +000021
Marc Zyngier3695adc2011-09-08 13:15:22 +010022#include <plat/platsmp.h>
Russell King59ac59f2010-02-11 21:56:07 +000023
Marc Zyngier3695adc2011-09-08 13:15:22 +010024#include "core.h"
Russell King3705ff62010-12-18 10:53:12 +000025
Jon Medhurst033a8992013-01-30 09:12:55 +000026bool __init vexpress_smp_init_ops(void)
27{
28#ifdef CONFIG_MCPM
Lorenzo Pieralisi525d4012016-09-23 14:09:06 +010029 int cpu;
30 struct device_node *cpu_node, *cci_node;
31
Jon Medhurst033a8992013-01-30 09:12:55 +000032 /*
Lorenzo Pieralisi525d4012016-09-23 14:09:06 +010033 * The best way to detect a multi-cluster configuration
34 * is to detect if the kernel can take over CCI ports
35 * control. Loop over possible CPUs and check if CCI
36 * port control is available.
Jon Medhurst033a8992013-01-30 09:12:55 +000037 * Override the default vexpress_smp_ops if so.
38 */
Lorenzo Pieralisi525d4012016-09-23 14:09:06 +010039 for_each_possible_cpu(cpu) {
40 bool available;
41
42 cpu_node = of_get_cpu_node(cpu, NULL);
43 if (WARN(!cpu_node, "Missing cpu device node!"))
44 return false;
45
46 cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0);
47 available = cci_node && of_device_is_available(cci_node);
48 of_node_put(cci_node);
49 of_node_put(cpu_node);
50
51 if (!available)
52 return false;
Jon Medhurst033a8992013-01-30 09:12:55 +000053 }
Lorenzo Pieralisi525d4012016-09-23 14:09:06 +010054
55 mcpm_smp_set_ops();
56 return true;
57#else
Jon Medhurst033a8992013-01-30 09:12:55 +000058 return false;
Lorenzo Pieralisi525d4012016-09-23 14:09:06 +010059#endif
Jon Medhurst033a8992013-01-30 09:12:55 +000060}
Pawel Molld2606f82013-09-17 18:30:58 +010061
Pawel Molld2606f82013-09-17 18:30:58 +010062static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
63 { .compatible = "arm,cortex-a5-scu", },
64 { .compatible = "arm,cortex-a9-scu", },
65 {}
66};
67
68static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
69{
70 struct device_node *scu = of_find_matching_node(NULL,
71 vexpress_smp_dt_scu_match);
72
73 if (scu)
74 scu_enable(of_iomap(scu, 0));
75
76 /*
77 * Write the address of secondary startup into the
78 * system-wide flags register. The boot monitor waits
79 * until it receives a soft interrupt, and then the
80 * secondary CPU branches to this address.
81 */
Florian Fainelli64fc2a92017-01-15 03:59:29 +010082 vexpress_flags_set(__pa_symbol(versatile_secondary_startup));
Pawel Molld2606f82013-09-17 18:30:58 +010083}
84
Masahiro Yamada75305272015-11-15 10:39:53 +090085const struct smp_operations vexpress_smp_dt_ops __initconst = {
Pawel Molld2606f82013-09-17 18:30:58 +010086 .smp_prepare_cpus = vexpress_smp_dt_prepare_cpus,
87 .smp_secondary_init = versatile_secondary_init,
88 .smp_boot_secondary = versatile_boot_secondary,
89#ifdef CONFIG_HOTPLUG_CPU
90 .cpu_die = vexpress_cpu_die,
91#endif
92};