2 * linux/arch/arm/mach-vexpress/platsmp.c
4 * Copyright (C) 2002 ARM Ltd.
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.
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/smp.h>
15 #include <linux/of_address.h>
16 #include <linux/vexpress.h>
19 #include <asm/smp_scu.h>
20 #include <asm/mach/map.h>
22 #include <plat/platsmp.h>
26 bool __init
vexpress_smp_init_ops(void)
30 struct device_node
*cpu_node
, *cci_node
;
33 * 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.
37 * Override the default vexpress_smp_ops if so.
39 for_each_possible_cpu(cpu
) {
42 cpu_node
= of_get_cpu_node(cpu
, NULL
);
43 if (WARN(!cpu_node
, "Missing cpu device node!"))
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
);
62 static const struct of_device_id vexpress_smp_dt_scu_match
[] __initconst
= {
63 { .compatible
= "arm,cortex-a5-scu", },
64 { .compatible
= "arm,cortex-a9-scu", },
68 static void __init
vexpress_smp_dt_prepare_cpus(unsigned int max_cpus
)
70 struct device_node
*scu
= of_find_matching_node(NULL
,
71 vexpress_smp_dt_scu_match
);
74 scu_enable(of_iomap(scu
, 0));
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.
82 vexpress_flags_set(__pa_symbol(versatile_secondary_startup
));
85 const struct smp_operations vexpress_smp_dt_ops __initconst
= {
86 .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
,